Scientific Discovery Essay Example | Topics and Well Written Essays - 500 words

Scientific Discovery - Essay Example trick B Sharp discusses how Wells had established the connection of atomic bomb in his book Savage Perils where Wells extrapolated the work of British chemist named Frederick Soddy, who worked on radioactivity. It was remarkable that Wells has mentioned that term on the pages of his book ‘The World Set Free’ in 1914, which made it obvious that the forecast of the writers may prove to be very accurate. Dr. Patrick B. Sharp quoted that the term â€Å"atomic bomb† was coined by H. G. Wells and he was the one who popularized the same. The fiction of Wells led to a scientific breakthrough. The application of principles in atomic energy and radioactivity combined to create the â€Å"Atomic Bomb† that was used during World War II. The moral question was whether or not this astounding discovery is used for the betterment of the society or for destruction. It was analyzed by many groups that the contributions of the atomic bomb in military technology and misuse for war purposes, was real and could lead to death of millions of people. Despite the fact that it can be used as nuclear power to harness enormous energy, the moral responsibility of individual scientists in wartime was the bigger issue. The whole world is aware of what had happened when President Truman ordered to drop the atomic bomb in Hiroshima and Nagasaki in World War II. Japan feels the radioactive effect of destruction even today after more than 60 years. Today there are many nations in the world who has nuclear power and there is no guarantee that they would not use this technology to over-power their enemy, which will surely jeopardize the pursuit of life, liberty, or happiness of the common people. The atomic bomb dropping of America on Japan after World War II is the best instance that can be cited to prove the evil of this astounding scientific discovery. During that time, only few nations had nuclear power but today most of the nations have nuclear power, which they can use for acts of terrorism.

Political Dialogue between Hitler and Stalin Essay

Political Dialogue between Hitler and Stalin - Essay Example Thesis statement: The imaginary political dialogue between Adolf Hitler and Joseph Stalin prove that Nazi and communist worldviews on key political issues are theoretically correct but practically disastrous. The Nazi and Communist worldviews on key political issues The Nazi ideology was based upon racial purity, Aryan domination and hatred against the Jews. James Giblin â€Å"There are no memorials to Adolph Hitler in Germany, the country he ruled with an iron hand from 1933 to 1945† (1). At the same time, this ideology was deeply influenced by Friedrich Nietzsche’s philosophy. On the other side, the Russian Communism was deeply influenced by Marxism which originated in Germany. At the same time the practical side of both these political ideologies (say, under dictators) proved to be disastrous. The imaginary political dialogue between Adolph Hitler and Joseph Stalin proves the same. A. On French Revolution Hitler: Good morning, Mr. Joseph Stalin, are you happy with yo ur manipulation of Communist ideology and its degradation in USSR? Stalin: Morning, see Mr. Hitler, you know nothing about the will power of the working class people. I represent the Communist Party in USSR, not dictatorship. If you know more about working class struggle, please tell me about French Revolution? Hitler: Ha, ha, ha. It was the most foolish attempt undertaken by the so called revolutionaries in France. Did they win anything? No. Were they able to overpower the world? Then why you people back up such a foolish act. I feel pity of you. Stalin: Your words prove your ignorance. See, French revolution deeply influenced the world history and it elevated the dignity and personal liberty of human beings in general. But you people will not try to understand the same as a human attempt to regain dignity because you do not believe in human dignity. William Doyle states that â€Å"In political terms pre-revolutionary France was an absolute monarchy† (21). Hitler: Again talk ing nonsense. You consider yourself as the messiah of revolutionaries, and then what is your role in USSR? Why you wear the mask of a Communist? Stalin: You are beating around the bush, without pointing out any important matters regarding political issues like French Revolution and it’s after effects. So, I feel better to conclude this matter. Thanks. Hitler: But you never reveal your real identity as a fake communist and a dictator. B. On American Revolution (1775–1783) Stalin: Mr. Hitler, what is the Nazi opinion on American Revolution (1775–1783)? Was it a revolutionary attempt undertaken by the Rebels in America? Hitler: Mr. Stalin, it was a lame attempt undertaken by anti-revolutionaries in America. Stalin: I was quite sure that Nazis will consider American Revolution as a lame attempt. But did the American revolutionaries in thirteen colonies of North America defeat the Great Britain? Hitler: See, the French, Spanish and Dutch conspiracy defeated the Briti sh forces, not the revolutionaries. Stewart Ross points out that â€Å"However, America’s revolution was more than just a military triumph† (8). Stalin: Ok. Who did authorize the British Parliament to impose direct taxation or the Stamp Act of 1765 in American colonies? What was the consequence? Did it accelerate the American attempt to form a shadow government? Hitler: See, your knowledge is not deep and the

Market Analysis Of The Cleaning Sector Management Essay

Market Analysis Of The Cleaning Sector Management Essay The Cleaning Industry National Training Organisation (CINTO) has suggested that the UK cleaning industry is valued in the region of  £12bn, 2.7 million households in the UK spend as much as  £11 billion annually on domestic help, the rise in two-salary household and more disposable income but limited time for domestic chores necessitates this, the cleaning industry presently employs about 820,000 people. The industry is mainly dominated by small organisations and has 72% of all UK cleaning staff employed in firms with less than ten employees. A third of these firms are operated by sole proprietors. CINTO is of the opinion that the cleaning industry is resistant to economic recession as a result of the huge demand and inevitability of service. Competition is stiffer however in commercial cleaning sector than domestic. This can therefore affect profit margin. Regardless of the intense competition, the cleaning industry is a booming industry with an impressive growth in the contract cleaning market from  £4 billion in 1996 to  £6 billion in 2004. Below is a tabulated STEP analysis of the cleaning sector. Social Population and market consist of 61 million people with 67% in the working class, 16.2% aged and 16.4% under aged. Labour is predominantly made up of migrant workers. Industrial servicing. Subject to environmental protection agency laws Economic The sector is slightly affected by the economic downturn but not significantly as it is a service sector and inevitable to all households in the UK. Demand cuts through all class and age structure in the UKespecially the working class which accounts for 67% of the UK population. This sector is a sub sector of the service sector that accounts for a large portion of the UK GDP. Theres been a shift in demand preference to price from quality and innovation because of the economic downturn. Increased competitiveness. Technological General services of cleaning, trash pickup, floor polishing, and the specialty services of cleaning carpet and ducts and washing windows. Staff cleaning buildings and houses by hand or with the help of basic equipment like floor polishers. Operations is labour-intensive Sector is labour intensive Simple machines and technology needed. POLITICAL Government legislation and regulation with respect to waste disposal. Organised and influential association body with intense pressure on government. Low government aid policies. According to MBD (Market and Business Development) report on the sector, Contract cleaning in the UK has grown by over 12 per cent in the past five years and is expected to increase by a further 13 per cent between now and 2011. The UK Cleaning Market 2004-2012:- There were over 4,300 individual contract cleaning firms active in the UK in 2008, though the industry remains particularly consolidated in value terms, with the firms in this study contributing more than 80% of the total market revenue. It has been suggested that 30% of contract cleaning firms are considered at risk in 2009 with the growing problem of customer retention. Customer loyalty is considered less prevalent, and customers of contract cleaners are continually searching for more competitive prices. This competitive trend in the market is pushing price competition in an environment where demand is reducing as smaller firms are internalising certain cleaning duties instead of outsourcing. The downturn in capital expenditure of contract cleaning firms will undoubtedly affect cleaning equipment manufacturers and suppliers in the short term, with a reduction in demand also aggravated by increasing pricing pressure as Contract Cleaning firms attempt to achieve greater cost reduction measures. The impact for tool and equipment manufacturers are less positive with regards to supplying to this sector in the short term, the need for effective marketing strategies therefore arises to target those companies who are performing well in the market. The cleaning sector provides employment for over 450,000 people in nearly 32,000 firms. Table 2: Workplaces and Employees within the Cleaning Sector in Great Britain. Source: Annual Business Inquiry, ONS, 2005 2006 85% of all cleaning companies have 10 or less employees. 1% of companies has over 200 staff and provides jobs for approximately half of all the cleaning employees. The current uncertain world economy makes analysis of current and future economic performance very difficult. Staffing and retention remains key themes for the sector as it struggles to maintain a stable workforce. This has been made worse by the pressure on sales and the stiff competition within the environment. The effect of the global economic downturn on the sector has been viewed as been less subjective as with other sectors since cleaning is an inevitable service. As expected however, employee training suffers a decline as profit margin reduces. Profit margins remains reduced in the sector, at about 5% in 2006, having been squeezed by 28% between 2002 and 2006. Labour costs consist of about 73% of all costs, this having been increased by 13.2% over the period 2002-2006. Gross Value Added (GVA) per worker (measured as the average financial contribution to turnover each employee within a sector generates) was  £9,600 in 2006 compared to a whole economy average of  £33,300. In 2006, seven companies had 25% of the market share (as a percentage of total value), as seen below. Table 1: Market share, (as a percentage of total value) in 2006 Source: Marketing Research for Industry, Feb 2000 A major challenge of this sector is the credit crunch and the effect it has on the sectors quality service delivery given the budget. Recruitment and retention are also key issues, issues regarding labour force attraction and motivation to family friendly labour policies. Future issues to be considered include the need to improve marketing to attract new clients, management of skills gap and planning is vital. The take-up of qualifications within the industry has been low and almost half of employers dont have a Level 2 or equivalent qualification. 16% of the sector is not aware of Vocational Qualifications, though their appropriateness is called into question. A third of all firms believe they take too long in delivering and five in ten believe they are too complicated. The BICSc (British Institute of Cleaning Science) is the most common qualification held. Cleaning firms suffer from increased rate of staff turnover which has been known to be closed to 75% in some cases, with most cleaning staff staying in employment for up to 12 weeks cleaners. 6% of cleaning firms advertised skills vacancies in 2007 -according to the National Employer Skills Survey 2007, this was primarily in elementary occupations and machine operatives. 80% of elementary occupations were categorised as difficult to fill positions. Almost 800 companies advertised these positions and were located within the West Midlands, South West and South East. Reasons for these difficult to fill vacancies are: à ¢Ã¢â€š ¬Ã‚ ¢ Inadequate personnel interested in engaging in this type of job (28%). à ¢Ã¢â€š ¬Ã‚ ¢ Inadequate number of applicants generally (16%). à ¢Ã¢â€š ¬Ã‚ ¢ Low number of applicants with the required attitude and motivation (13%). The implication of these vacancies is the increased workload of other staff. Cleaning firms have alleged that they have: à ¢Ã¢â€š ¬Ã‚ ¢ increasing cost of operation; à ¢Ã¢â€š ¬Ã‚ ¢ Difficulty in matching quality standards requirements à ¢Ã¢â€š ¬Ã‚ ¢ Delay in developing new products. As a result of the above issues, 50% of firms have increased their advertising and recruitment campaign and most of the firms are increasingly trying new ways of recruitment. Reductions in some skills area have been identified in the Cleaning Industry, these include: à ¢Ã¢â€š ¬Ã‚ ¢ Management and leadership; à ¢Ã¢â€š ¬Ã‚ ¢ Technical skills; and à ¢Ã¢â€š ¬Ã‚ ¢ Literacy, numeracy and ESOL A key driver in the sector is the changing form of procurement. The process of procurement has become increasingly formalised and has most part been subject to European Union Commission guidelines, more challenges are therefore placed on cleaning firms in this sector. A recent report implied the importance of migrant workers within the industry. Firms in the cleaning sector are faced with an ageing workforce and recruitment issues, these firms have therefore been able to tap into the large resource of migrant workers, this has culminated in 37% of Englands cleaning labour being classified as migrant labour. Firms have been able to recruit more efficiently and cost effectively as well, however the only hinderance to this is the issue of language which is being subdued by coping the strategies from employer. Regional Distribution of cleaning companies within England, 2006 There are increasing demands being placed on the industry due to increased regulation and Visibility which, in time, it is anticipated will reveal greater skill needs. There are a couple of key issues as regards the cleaning sector, they include,  · Recruitment difficulties for domestic cleaning jobs because of competition from other sectors.  · Increased day-time cleaning and expanding skill mix needed  · Employment of migrant workers without language barrier.  · Employing expertise cleaning operatives into supervisory and managerial positions with inadequate training.  · Forecasted job losses of over 90,000 between 2004 and 2014 but concerns of replacement demand still workable.  · Pressure from customers for more work per capita in order to deliver contracts with less people  · Low rate of retention.  · Lack of long term investment in staff  · Difficulties in recruiting new employees into the workforce  · Misconstrued negative image for the sector discourages prospective minds to commit to a career in the industry.  · Skills gaps in managing teams, project management, problem solving and resource allocation, customer care, and managing change for supervisors and managers  · Mixed quality of training provision with low retention rates and qualification  · Inadequate filling of management training slots in the industry  · A small size of employers in the industry had a budget for training of employees.  · Unaccredited training for staffs.  · Employers want tailor fit training that meets their immediate needs and well as their budget.  · The key issues to training to training include the margins on contracts where training is perceived as a cost, career progression is seen as a mirage, shift work and problems of release, and inflexible modes of delivery. The cleaning sector is a low tech business characterized by ease of entry and entry. Highly competitive, reduces pricing and subsequently profits. Convenience is key in the cleaning sector, location to the market and fast turnaround on clothes so also cleanliness of the item are important. Consumer care little about what euipments or technology dat has being used as long as the the cleaning service is fast, convenient and effective. A model has been designed to address a couple of the sectors issues and it is outlined

Formation of the Triple Alliance :: History

Formation of the Triple Alliance In 1871 two new major states of Europe had been formed—the German Empire and the kingdom of Italy. The new German Empire, under the hand of Otto von Bismarck, was steered carefully, always with an eye upon France, for the Franco-Prussian War (1870–71) had left France thirsting for revenge and for recovery of the lost provinces of Alsace and Lorraine. 2 Germany had allied itself with Russia and Austria-Hungary in the Three Emperors’ League, but Austria-Hungary and Russia were not the best of friends, partly because they were at odds over the Balkans and partly because Russia represented the Pan-Slavic movement, whose program threatened the very existence of Austria-Hungary. The Treaty of San Stefano (1878), following the Russo-Turkish War, furthered the cause of Pan-Slavism through the creation of a large Bulgarian state and offended Austria-Hungary as well as Great Britain. A European conference (1878; see Berlin, Congress of), called to revise the treaty, caused a sharp decline in the friendship between Russia on the one hand and Austria-Hungary and Germany on the other; Bismarck formed (1879) a secret defensive alliance—the Dual Alliance—with Austria-Hungary. 3 In 1882 Italy, angry at France chiefly because France had forestalled an Italian advance by occupying Tunis, signed another secret treaty, which bound it with Germany and Austria-Hungary. Thus was the Triple Alliance formed. It was periodically renewed until 1913. In 1882 Serbia joined the alliance, in effect, through a treaty with Austria-Hungary. Romania joined the group in 1883, and a powerful Central European bloc was created. Italy was from the first not so solidly bound to either of its allies as Germany and Austria-Hungary were to each other. Italy was in fact a rival of Austria-Hungary in the Balkans and particularly for control of the Adriatic; moreover, there remained unsettled territorial problems (see irredentism). The Triple Alliance, however, turned diplomatic history into new channels. 4 Formation of the Triple Entente The Three Emperors’ League died a slow death, but in 1890 its day was over: Germany refused to renew its reinsurance treaty with Russia, and Russia in consequence sought a rapprochement with France. At the same time France, face to face with an increasingly powerful Germany and a hostile Central European combination, felt great need of an ally, and French diplomats began to make overtures to Russia for an agreement to counterbalance the Triple Alliance. French capital aided Russian projects, especially the Trans-Siberian Railroad, and friendly diplomatic visits were exchanged.

Advice to a Friend on Choosing a Mistress Essay

In his message, Franklin advises his friend that marriage is the best solution not for only sexual desires but also the undisputable source of solid happiness. Having suspicions that his friend would not follow his guidance, Franklin recommends him to choose older mistresses instead of younger ones and lists eight valuables reasons to better support his argument. Franklin commences his essay by presenting advantages of the marriage. He says I know of no medicine fit to diminish the violent inclinations you mention†¦ Marriage is the proper remedy. It is most natural state of man and therefore the state in which you can are most likely to find solid happiness†. Through those sentences, Franklin seems to estimate that from a masculine’ view, one of the main advantages of the marriage is to bring pacification toward requirements of the flesh. The recipient of the letter who was the friend of the author seemed to be looking for a situation in which he could find sexual partner and happiness without commitment. Based on the previous quotes, the author claims that the best situation in which he could find hat he was looking for was a marriage. In his letter, Franklin advices his friend to settle because ‘ It is the man and woman together that make the complete human being†. If Franklin thinks that the marriage is so positive, this is relied to both psychological and socio-economical reasons. First all he is convinced that the married life is more balancing that the single lifetime. Franklin believes that a man who did not find the soul mate is in other words incomplete, unaccomplished by saying that A single man has not nearly the value he would have in that sate of union, He is an ncomplete animal. He resembles the odd half of a pair of scissors†. Based on this judgement, Franklin means that family life calms people; it is the natural arrangement in which they can organize their production’ strength with the most possible benefit. While Franklin affirms that together there are more likely to succeed in the world† there is no doubt that he is referring to the material success. Concerning the woman, it is only in a marriage that she can show up her real values. Through the letter, Franklin continues to give worthy reasons in order to convince the ecipient about getting married. Franklin having doubts that his friend would not consider his advice followed his representation of the marriage by an alternative solution to satisfy his needs. If his friend his not ready to commit and wants to continue a commerce with Sex inevitable†, he suggested that ‘ you should prefer old woman to young ones†. The first raison that Franklin used to support his case is that they nave more knowledge ot the world, and their minds are better stored witn observations, their conversation is more improving and more lastingly agreeable†. By affirming this, Franklin makes an allusion to the intelligence of older woman. He illustrates that people gain knowledge as they get older. They have, in principle knew more love stories or adventures than youngest ones, thus they better know men, know how to take care of them and also how to satisfy them. Franklin defends the idea that a debate with an old woman is rich and interesting, because they had been through many involvements from witch they had retains acquaintance. They have lived longer and have things to communicate to you. Franklin also supports his reference for older woman by saying that To maintain their influence over men, they supply the diminution of beauty by an augmentation of utility’. This is to illustrate that older woman, with the time spend less time worrying about their appearance, which they use to do more important stuff. To him, when beauty disappears, women improve their service. At their age, they assume their femininity and do so without any complex. Franklin, who was a man of science and also know as Lady Man’ also gave bodily motivation for choosing an older woman. He implies that ? because in every animal that walks upright the deficiency of the fluids that fill the muscles appears first in the highest part. The face first grows lank and wrinkled; then the neck; then the breast and arms; the lower parts continuing to the last as plump as ever: so that covering all above with a basket, and regarding only what is below the girdle, it is impossible of two women to tell an old one from a young one†. His purpose here is to assure his friend that there are no doubts or fear to have on the corporal pleasure of an old woman. According to him as in the dark all cats are rey, the pleasure of corporal enjoyment with an old woman is at least equal, and frequently superior†. This is to support that woman are woman regardless of age, an old woman can perform the same way as a young one concerning sexual experience. Sometimes, they are even considered superior. Through the note, Franklin by saying because there is no hazard of children, which irregularly produced may be attended with much inconvenience† refers to the fact that woman at a certain age can’t get pregnant. Thus while dating them the chance of being relied to them by omeone or something is null. This also makes the separation easier and leaves out others inconvenient that children can bring in a relationship. Across the letter, Franklin continues to encourage his friend to choose an old female if this last one persist in thinking a Commerce with the ser. He establishes a formal and highly analytical tone with his receiver about the discretion an old mistress can have in their relationship. He supports his suggestion by affirming that because through more experience they are more prudent and discreet in conducting an intrigue to revent suspicion. The commerce with them is therefore safer with regard to your reputation. From the following sentence, the author suggests that with an old woman, it is less probable that the relationship get revealed consequently with her you reputation will be at the shelter because they are more responsible in managing a relationship and they now what they want. Finally, Franklin ends up with his letter by saying † they are so grateful†™. Even though Franklin, in his letter gave an approved receipt to find the best mistress, it is obvious that considering as the ounding father his interest for marriage respond to others concern more important than the promotion ot the psych-to-emotional blooming.

Days of Obligation: an Argument with My Mexican Father Essay

This book is written in a quick, quick witted, volatile changeable style. Rodriguez tries to expel of the tensions in his life and life in America. He parallels or relates the views of young and old, catholic and protestant, communalism and individualism, cynicism and optimism and the past and future in his own life. When Rodriguez goes to Mexico, he feels unwelcome. To me, he seems to feel that he is overeducated and superior to his peers in Mexico. A lot of Rodriguez’s opinions have come from his father’s view of the world. His father viewed it as a sad place, whereas when Richard was young, he viewed it as a fiesta. However, through adulthood, Rodriguez’s opinions of the world began to parallel his father’s. He plays numerous variations on the contrasts he derives from an argument he once had with his father: â€Å"Life is harder then you think, boy. † Rodriguez responds to his father, â€Å"You’re thinking of Mexico, Papa. You’ll see. † Rodriguez is extremely cynical, he feels inclined to question everyone’s motives about every decision they make. For example, on page 27, when talking about the Gay Freedom parade, Rodriguez states â€Å"they marched, east to west, following the mythic American path to optimism. † Meaning they are following a path that isn’t anything in Rodriguez’s eyes. It is hopefulness that Rodriguez doesn’t see at all. Additionally, Rodriguez states, â€Å"I have never looked for utopia on a map. My compass takes its cardinal point from tragedy† (pg 29). This again proves that Rodriguez chooses to be negative and look at everything from a cynical, unfortunate standpoint. The above being said, I also believe Rodriguez fails to pursue a consistent argument. He has so many different viewpoints and issues. While he does stick with the reoccurring themes in the novel such as AIDS, barbarism vs. civilization and religion, all of them are developed independently. He thanks the church for the schooling he received, yet throughout the years, not only has he lost the strength in his faith but he foresees immediate crisis for the church. He goes from being negative and hating life in America to stating, â€Å"I became Americanized, I ended up believing in choices as much as any of you do† (pg 172). He feels now as if being Chicano it is holding him back even though he is trying to get to the level he should be at as an American. In doing further research, I have found that a lot of the readers of this book also feel the same way. One essay I read stated that Rodriguez is â€Å"a walking dichotomy. † I completely agree with this because he is gay, a devoted Catholic, Mexican even though he barely speaks Spanish, American but still feels that he is different than the rest of America, Mexican-American who despises Chicanos, a gay man who sets himself apart from gay men, and an English scholar who leaves the academy. Furthermore, Rodriguez is committed more to the truth when he discovers it through than he is committed to any political agenda. Although no matter what he says about feeling American or living in America, he is deeply involved in Mexican and catholic values and makes it evident how alien he feels when he travels through Mexico because he feels everyone is a bandit. Further stating, â€Å"if the United States stole California from the Mexicans, the Mexicans had stolen it from Spaniard, who had originally stolen it from the Indians. † Overall, the book was a difficult read because of all the inconsistent arguments and topics Rodriguez approached. While he is an educated and knowledgeable writer, he approached everything with a negative view of life. I felt he was too straight-forward, too dark, and wide-ranging which in the end made a lot of topics confusing. However, I thought it was interesting to learn his views and I have grown from reading this dissertation.

Greek Philosophy (Socrates, Plato, Aristotle) essays

Greek Philosophy (Socrates, Plato, Aristotle) essays No matter how advanced or more knowledgeable we are compared to ancient civilizations, we cannot say that what they contributed did not affect us directly. From simple things such as fire, to more complex things such as the concept of time, or complicated architecture, ancient inventors and other intellectuals paved the way for modern developments. Without the research and curiosity of our forefathers, we would not know, AND have what we know and have today. One of the major contributors to modern knowledge was the Greeks. They gave us knowledge in the fields of math through Pythagoras and his theorem on right triangles, and Science through Aristotles study of biology and Democritus study of atoms. Of course, although some may see their philosophies and beliefs to be inapplicable to todays society, Socrates, Platos, and Aristotles philosophies changed the way people think, and greatly affected the development of many western cultures, and even our own. The first in line of the 3 great philosophers of Greece was Socrates. Born in Athens in 469 BC, he was born in a relatively poor family. His father, Sophroniscus, was a sculptor and his mother, Phaenarete, was a mid-wife. Socrates himself was a sculptor, but he was never really good at it. And although he was poor, he was able to marry and raise a family. There is a story told, that one day, his friend, Chaerephon, asked an Oracle in Delphi whether or not there was someone wiser than Socrates. Strangely, the oracle answered No. When Socrates heard about this, he was puzzled as to why the Oracle answered in that way. He figured that maybe it was some sort of a riddle, for he thought that he possessed no special wisdom at all. In order to find out, Socrates decided to talk with the various town folks of Athens, such as the doctors, scholars, sophists, and basically anyone who was willing to talk to him. Although ...

Zeolites are just like clay minerals because both are composed of aluminosilicates The WritePass Journal

Zeolites are just like clay minerals because both are composed of aluminosilicates Zeolites are just like clay minerals because both are composed of aluminosilicates INTRODUCTIONS:THE ZEOLITE STRUCTURE.NATURAL ZEOLITESARTIFICIAL ZEOLITES.DIFFERENCE BETWEEN NATURAL AND ARTIFICIAL ZEOLITES.APPLICATIONS OF ZEOLITESCONCLUSIONS:REFERENCES:Related INTRODUCTIONS: Zeolites are just like clay minerals because both are composed of aluminosilicates, although they differ in their crystal structure in that clay minerals deform in water showing expansion and contraction while zeolites are stable and rigid in water [8]. Both natural and synthetic zeolites are basically composed of aluminosilicates they may differ in the Si/Al ratio and pore sizes. Zeolites   as defined by the mineralogist community Ê »ÃŠ » is a crystalline aluminosilicate with a 4-connected tetrahedral framework structure enclosing cavities occupied by large ions and water molecules both of which have considerable freedom of movement permitting ion exchange and reversible dehydration. Ê ¼ÃŠ ¼[6]. Fig1 The tetrahedral structure of these micro porous aluminosilicates is of the form   where T can be either Al or Si. The silicon based framework () structure is uncharged or neutral but when Al is introduced into this structure () a negative charge is induced due to shortage of electron from the Al with valence of   taking the place of Si with . This has to be neutralized by extra cations attaching themselves to the structure [5]. In summary one can say the stability of the zeolite structure depends on the ratio of Si/Al. with higher ratio of these elements the zeolites have better stability for example in acidic environments. For Si/Al ratio 10 the framework may be considered as having high silica. Zeolites may have the following structural formula.  ..[5] .Where the first part represent extra framework cations, the middle term is the framework and the last part is the sorbed phase. Zeolites are unique considering their inherent physicochemical properties and a lot of researchers and scientists worldwide have developed interest in exploiting and utilizing the valuable properties of these minerals since from their first discovery. The name zeolite is of Greek origin simply meaning boiling stone considering the facts that water is fast lost from it when heated [1] and this is an important property of the zeolite opening door for many applications. These minerals occur in nature in sedimentary deposits and can also be artificially made in the laboratories [6], pore sizes being determined by intended purpose and application, in fact this is one of the advantages of the synthetic zeolites. They exist in 3D structures [8] with cavities that   houses   cations, organic and water molecules. The structure of the zeolite is not affected when elements and ions are removed from their cavities. THE ZEOLITE STRUCTURE. They are generally micro porous and the micro porosity plays an important role in the characteristics of the zeolites. The important and unique property of zeolites that distinguishes it from other structures is the formation of tetrahedron which can be connected to each other by bridging oxygen to form chains. A list of about 133 different framework structures has been identified [6]. The fundamental criterion for identification is the framework density which is the tetrahedral connected atoms per 1000Ã…. There are 21T atoms per 1000Ã… for porous tectosilicates. The structural composition can be changed by introducing metals such as Ge, B, Zn, and P. the basic structure of the zeolites can be separated into two broad classes. I) the basic tetrahedron which is the initial building block and ii) the composite consisting of many units joined together [6,1]. The unit cell which is built up by repeating itself in the format   where T represents cations that is Al or Si etc and th ey are in turn connected to oxygen atoms at the corners. FIG2. In the basic building block each tetrahedron is connected to adjacent one by abridging oxygen eg. T-O-T. The angle between T-O-T does vary from 140 to 165 degrees for silica tetrahedra[6]. Angular variations give variety of zeolite framework types. Boron and zinc are the smallest and largest cations found attached to the zeolite structure with 1.44Ã… and 1.95Ã… bond sizes. Generally zeolites has a small range of pore sizes ranging from (1-20Ã…)[3], to be specific for FAU-type the pore size is 7.4Ã…, for alumophosphates the value is 12.1Ã…. Pore sizes greater than 20Ã… -500Ã… are mesoporous materials while greater than 50nm are considered as macroporous materials.[5]. NATURAL ZEOLITES First discovered in 1756 by A.F. Cronstedt, it occurs by natural geological phenomena such as volcanic eruptions that has taken place in the earth crust and are found usually in alkaline lake sediments and soils.[5]. The basic composition is lower Si/Al ratio. Clinoptilolite with chemical composition (Na,k)(Al  3) is one of the most important zeolites among the list of over 40 natural zeolites because of its fine grains. The clinoptilolite and another natural zeolite Mordenite (MOR) have great agricultural and sorbent applications. Some natural zeolites are inherently toxic causing lungs related illnesses [5] and should be handled with extra care. Another example of natural zeolite is Mutinaite whose artificial counterpart is the ZSM-5[4]. This mineral has a Si/Al ratio of 7.6 which seem to be the highest value for natural zeolites[4]. In addition the mineral is thermally stable with a high rehydration capacity. Natural zeolites when exposed to environmental conditions for a very l ong time may lose a higher percentage of water content in their channels and left with residual amount. Channels could be destroyed by high rate of water removal from it. Other frameworks such as alumophosphate consist of tetrahedral units and are classified as zeolites[5] and this framework is uncharged as was the case with aluminosilicate frameworks for this reason the channel contains only water molecules.fig 3 ARTIFICIAL ZEOLITES. The natural zeolite is inflexible in terms of their atomic structure and hence the properties cannot be altered this limitation calls for the need for synthetic counterparts that could be used for any desired application. For example one can make a zeolite with larger cavities than the natural one to suit certain application and it is worthy to note that some of the synthesized zeolites have not known natural counterparts [1]. The following methods are commonly used for zeolites synthesis. 1. Hydrothermal synthesis: the components are mixed in water to form aqueous solution and heated from room temperature to 300 degrees with PH maintained at 7. Some natural zeolites cannot be synthesized because their structure and stoichiometry is very difficult to predict [5,6]. In the synthesis of aluminosilicates cabosil is used as the source of Si and Al while oxy hydroxide is the alumina source with organic cations and alkali hydroxide forming the template and base respectively. The template can control the desired pore diameter and the shape of the zeolite to be made. The template can be removed by thermal decomposition. 2. High pressure hydrothermal: analogous to the natural phenomenon zeolites can be synthesized in the laboratories under the influence of high temperature, pressure and the presence of water. The magnitude of these parameters range from 12hrs to 72 days for time taken during synthesis, 100bar to 4kbar is the applied pressure range and from 25 degrees to about 700 degrees is the temperature [5]. Laumontite is an example of zeolite synthesized by this process. The Si/Al order in zeolite framework as well as crystal behavior can be influenced by synthesis temperature. The disadvantages associated with this method are the use of high pressure and the longer process time. The synthesis of zeolite is one very important way of dealing with the issue of how to dispose sludges generated from paper industries, drainages and coal processing[2]. The good work of Dr Teruo Henmi helped saved the environment by converting ashes from these sludges to zeolites which has a lot of uses covering areas in agriculture, public health and cosmetics etc[2]. so artificial zeolite is now seen as an avenue to recycle wastes ashes which use to be an environmental problem. DIFFERENCE BETWEEN NATURAL AND ARTIFICIAL ZEOLITES. 1. The ratio of silica to alumina is small in synthetic zeolites compared to the natural one. We have 1:1 and 5:1 in clinoptilolite.[9] 2. To synthesize we need chemicals and considerable consumption of energy but the natural ones occur by geological processes.[9] 3. Natural type like the clinoptilolite is stable in low acid environment while the synthetic one breaks under this condition. The stability of the clino type is because of the high silica content. And this clino type is preferred for agricultural application like land amendment and forms part of livestock feeds.[9] APPLICATIONS OF ZEOLITES Zeolites both natural and synthetic one has found great deal of application areas be it activities involving chemical reactions or biochemicals[2]. Synthesis of these minerals creates a wider opportunity to extend the field of application of the zeolites, some most common applications include separation and purification of mixtures whether in liquid or gaseous forms using popular methods like sieving, or filtering and sorption[5] the molecular sieving ability can be possible because of the uniformity of pore sizes of the zeolites which make easy to separate molecular compostions with different sizes for example sizes less than 1Ã…[6].zeolites have been used as molecular sieve since 1925 to date[1] when it was released that gas could be separated due to variation in molecular sizes. Chabazite with a small pore size of 0.5nm is commonly used for gas separation. Other applications include ion exchange and for storage purposes. The simplest application of zeolite that touches every ho me is in water softening in kitchens and laundries used for washing, the history of this application dates back to 1913[1]. Synthetic zeolite such as Linde (Na-LTA) and the GIS type Na-gismondine are commonly used for this purpose. LTA is also used for water purification in treatment plants. Some other zeolites used for this purpose are synthetic type like ABW, and GIS and Phillipsite (PHI) both its natural and artificial forms are also used [5]. These has windows that are medium sized and can be effectively used to treat water containing radioactive elements as contaminants common example being cesium or strontium and waste water from mining sites. Conservation and drying of food items especially the perishable one is very important and this can be simply done by the sorption property of zeolites. There is no doubt every living place needs fresh air for good health zeolites are used to remove odours e.g ammonia which smell bad in industrial environments[5,2]. Naturally occurring ze olites like clinoptilolite (HEU) are good sources of fertilizers when applied on agricultural soils they simply enrich the soil by elements like potassium and these minerals also improve the water retension capabilities of the soils. Animals and birds feed containing zeolites provides good and nitrification and improves their yields [5,6]. The petrochemical companies are not left out as zeolites Mordenite type (MOR) and ZSM-5 are used in the production of gasoline and dewaxing of fuels.[2]. CONCLUSIONS: Zeolites are one of the most important minerals that have direct bearing in the lives of mankind. Both natural and synthetic ones play a number of important roles in many areas such as agriculture, horticulture, and industries to mention a few[8]. The ability to synthesize these minerals to desired pore sizes and shape is one way of dealing with the problems of inflexibilities of the natural types to suit many applications. Zeolites contribute enormously to the economy as an estimated $130 billion circulates in the market, major share coming from oil companies buying zeolite products. REFERENCES: 1. A.F. Masters, T. Maschmeyer., 2011, Zeolites-from curiosity to cornerstone, 142, pp 423-438. 2. Artificial zeolite production and applications, presented by Solid Corporation, Osaka, Japan. 3.   A.P. Wilkinson., Zeolitic Materials. http://ww2.chemistry.gatech.edu/wilkinson/class ­Ã‚ ­_note. 4. G. Vezzalini, S. Quartieri, and E. Galli, 1997, Zeolites, 19, pp 323-325. 5. H. Ghobarkar, O. Schaf and U. Guth, 1999, Zeolites from kitchen to space., 27, pp 29-73. 6. S.M. Auerbach, A.K. Carrado, and P.K. Dutta. Handbook of zeolite science and technology. 7.   Water treatment solutions, lenntech.com/zeolites. 8.   Zeolite: The versatile mineral. zeoponix.com/zeolitehtm. 9.   Zeolites: About zeolites. zeoinc.com/zeolitehtm.

How to Make Thermite With Aluminum from an Etch-a-Sketch

How to Make Thermite With Aluminum from an Etch-a-Sketch You may have learned about exothermic reactions in chemistry class. In an exothermic reaction, chemicals interact and release heat and often light. Burning wood is an exothermic reaction. So is rusting of iron, although the reaction is so slow you dont notice much going on. You can react iron much more quickly and spectacularly using the thermite reaction, which burns aluminum. The classic method of performing the reaction involves iron oxide, aluminum powder, and magnesium, but you can make do with household materials: 50 grams of finely powdered rust (Fe2O3)15 grams of aluminum powder (Al) Iron Oxide Collect rust from a rusted iron object, such as rust from a wet steel wool pad. Alternatively, you can use magnesite as your iron compound, which may be collected by running a magnet through beach sand. Aluminum This is where your Etch-a-Sketch comes into play. The powder inside an Etch-a-Sketch is aluminum. If you crack open the Etch-a-Sketch, you have the perfect complement to the iron oxide from the previous step. However, if you cant find an Etch-a-Sketch, you can grind aluminum foil in a spice mill. No matter how you get it, wear a mask when dealing with aluminum powder because you dont want to breathe it in. Wash your hands and everything after working with the stuff. Etch-a-Sketch Thermite Reaction This is insanely easy. Just be sure to choose a location away from anything flammable. Use eye protection when viewing the reaction, since a lot of light is emitted. Mix together the iron oxide and aluminum.Use a sparkler to light the mixture.Move away from the reaction and let it burn to completion before cleaning it up. Once it is cool, you can pick up the molten metal and examine it. You can use a propane torch instead of a sparkler to initiate the reaction, but try to maintain your distance as much as possible.

Textual analysis of How to watch your brother die Essay

Textual analysis of How to watch your brother die - Essay Example The speaker clearly reveals the issue of homosexual society and the way the outside world view it. The author creates a situation whereby the brother is struggling over the death of his brother, who is sick. The speaker narrates the poem in the first person perspective in order to enable the reader to understand what he is trying to put across. It has been quite along when the speaker exiled the brother because he was a gay, but the speaker receives a call from his lover that his brother is dying. The speaker takes a plane to California in order to meet his brother’s lover. The speaker grieves over the love of his brother, but in the process, fails to understand the lover of his brother and the way she could grief and commit like a wife. Thus, the purpose of the essay is to analyze the possible message the author suggests through focusing on particular strategies employed in the text. Thesis: Lassell attempts to reveal the challenges many people face in an attempt of reaching others across differences, the pain, power of prejudice and homosexuality in the current society. The poem of Lassell explores the challenges that many people or families face, prejudice issues and homosexuality aspects in the current society. First, Lassell presents the poem in a unique way in order to reveal the barriers that disconnected the two siblings from communication. This barrier subsides or ends when the speaker realizes that his brother was suffering from a terminal illness and is about to die. The long lost brotherly love is restored, when the speaker realizes that his brother is about to die, and regrets for shutting him out. This clearly depicts what is happening in the current society because the poem presents controversy between the homosexuality issues and acceptance in the family unit. For instance, traditional families prohibit homosexuality; thus, they view gay people as an outcast and many of them face total exile. The speaker reflects this approach after the f uneral of his brother; thus, the author says, â€Å"Forgive yourself for not wanting to know him after he told you. He did† (Lassell pr.11 line 6). The deep hidden love of the brother reveals the shift in the present society where families attempt to embrace all of their children in an equal loving way regardless of their sexual orientation. The author made the choice of using first person perspective in order to enable the reader to understand clearly the issue of homosexuality and the consequences it contributes. The sonnet is a transformative in the logic that the narrator presents many challenges, painful experience and discomfort of homosexuality in the society. He struggle with the illness of his brother and even moves to Mexico in order to find better drugs. The poem is impressive because it educates the society about the challenges of homosexuality, which contributes to incurable diseases like AIDS. The speaker employs first language perspective in order to capture th e attention of the reader; thus moving the reader to appreciate the dilemma of the speaker. The speaker defines himself in a manner that enables the reader to discover varied challenges through his journey; hence understanding him clearly. The poem of Lassell is a stunning sonnet that captures the attention of the reader because of the textual strategies that the author employed. First, the author reveals the theme of commitment amid two characters including the brother and the

What is the significance of parthenogenesis in her underground Term Paper

What is the significance of parthenogenesis in her underground - Term Paper Example From the biological point of view this is a significant word that defies scientific principles and highlights the processes created naturally. The biological situation about Jesus during embryological development is the issue to be taken note of and all the process till His birth are known as parthenogenetic. God arrived to the human race, not through the normal sexual processes. Parthenogenesis is reproduction by a virgin. This supports the natural processes happening in the world though the physical aspects of Incarnations. Virgin births among the animals are known for centuries, but parthenogenesis is occasional amongst human beings. Knowledge about parthenogenesis has developed extensively and it covers most of the groups of multicellular animals and they reveal unisexual reproduction of one type or another. â€Å"But parthenogenesis is genuine sexual reproduction because it also uses sex cells,† (Kessel) yet is different from the normal union of

Biology and Psychology Essay Example | Topics and Well Written Essays - 1000 words

Biology and Psychology - Essay Example The psychological state of anger,fear or ability to understand differs from one being to another (individualistically) yet it does not differ from an organism to another -this depends on how it has from efforts and abilities to react and act according to what it is able to do and unable to do physically. The dimensions of one abling himself to understand what their abilities could be and what he could get from reactions both categorized as pleasant and unpleasant could allow him to fail or succeed in what he wants to do and is able to get from things and objects of pleasurea and desirable to him. The way of receiving and perceiving things makes one able or unable to get thoughts and actions properly fit together to be able to find a way of compromising how to work in a certain frame to be able to get what he wants and push away what he does noit want. Such things exist such as in obesity which occurs when one has a feeding disorder and is unable to stop because the food pleasure is something which takes their mind off something else and is unable to get other pleasures such as attracting the females in his life. This biological defect brings him to seclusion, deluding ideas and inability to communicate in a manner to be able to find the pleasure he would like to have outside the sphere of food. Yet not all people have this problem who are obese. A lot of people are unable to get thoughts out of their minds which help them not work what they want they want which brings them to be dysfuntional in their ability to face the 'fear factor' of refusal,discharge from a job due to lack of beauty,etc. Yet,although this affects a great number of people,alot of obese people live a normal life by adjusting to their desires of food for the fun of eating and loving food and the fact that they are humurous and sociable and a well wished for companion in a party. Another example of thoughts which affect the biology of the person is the fact that they could not think properly and adjust their ideas to fit what they want and are unable to get what they seem to wish for and want due to the fact that they could not keep up with the track of ideas they have in their minds. This occurs due to an inability to face and track the speed of thoughts that occur in the mind and heart from confused feelings weld and yielded by the inability to handle the self and thus results in the fact that they become explosive as a manner of what they think is a relieving of the ideas and thoughts that rush through their veins and ideas and thoughts do not leave but just fester inside and help the person just take up such belief as a habit. Biological factors and differences in hormone diffusions inside the body do not show or work the fact that such physiological differences between man and woman,child and adult have any effect except for the way that they arrange their thoughts and ideas and how they understand themselves and how they frame the meaning of communicating and how they understand the other and what it means to them to face the other and what they need and desire the resulting actions of communications to be with such people. Also,grammatical and lexical meanings in the

Case analysis Study Example | Topics and Well Written Essays - 2000 words

Analysis - Case Study Example He speaks in a stream of words that refer to the world and how â€Å"screw up it is†, when he reflects back on the traumatic experience he underwent. Signs of PTSD can be activated by sounds, memories, and dreams linked to the past trauma (American Psychiatric Association, 1994). In addition, seeing the objects or the people who may have taken some part in the trauma may trigger the symptoms of PTSD. He desperately wants to call his sister because he feels that she could be a source of solace when he is in problems. Jack exhibits post-traumatic stress symptoms, which are classified into three DSM IV categories. First is the persistent re-experiencing of the incident, which is also referred to as the intrusive signs. In this category, the victim could be experiencing vivid recollections, nightmares and a feeling of re-living the incident. Second is the persistent evasion of any stimuli, which might remind them of the traumatic condition. Finally, is a state where the victim experiences hyperaousal condition that causes hepervigilance, sleep interruption, and startle reflexes (Yehuda et al. 2002). The consequence of all these behaviors is some level of mental distortion, which prevents the victims from taking part in their daily activities. Other signs include bad temper, emotional liability, agitation, and sometimes eruption of violent behavior. If Jack is not treated on time, he may result to substance abuse in an attempt to seek self medication. Depending on the duration that Jack has suffered from this disorder since he experienced the traumatic event, the disorder can be categorized based on the DSM IV 4 including acute stress reaction, acute PTSD, chronic PTSD and delayed onset of PTSD. A multiaxial Diagnostic System commonly denoted as DSM-IV-TR uses diagnostic system with 5 levels used in the classification of disorders and illnesses. These five levels assist whoever is providing a

Reggae into the Contemporary American Society Essay

Reggae into the Contemporary American Society - Essay Example Regardless of the culture from which and individual hails, the common point is that a desirable culture should provide an individual with a sense of identity and the individual should be able to understand the dynamic nature of the world and be able to adjust to the changes encountered. Folk culture refers to the natural way of life that is defined by an ideal culture in a given community. This culture emphasizes on the human values like honor and the principle of reasoning and a view that the natural setting should be valued and considered wholesome. The spirit of hard work, self-discipline, and excellence are some of the aims of a folk culture, and which have currently lost grounds in the majority of the modern culture. Others include individual responsibility and loyalty to the authority. There are various ways through which communities preserve their cultural heritage to uphold their identity. The traditional cultural preservations include some ritual practices, traditional folk dances, folk tales, and folk music (Jankee, 2). The themes of the folk songs pointed out the cultural values like brevity, loyalty, and hard work. They often contained information on peaceful coexistence among the individuals in a given society. These traditional folk cultural expressions developed into the modern expressions with some deviations. Much of the human values that were emphasized by the traditional folk songs are not stressed in the modern Western cultures. The modern culture happens not to view nature as it was viewed earlier and neither does it allow nature to take control of life as in the olden days. There has also emerged a relation between the cultural expressions and grass root developments, especially in the developing nations. The different cultural expressions that are witnessed in different parts of the world are all concerned with the issue of defining the identity of the community.  

Chap 11 Video Harley Davidson Essay Example | Topics and Well Written Essays - 250 words

Chap 11 Video Harley Davidson - Essay Example The internet is only enhancing the ability of customers of getting information to discuss with the sales agents. Vehicles sales are enhanced when shoppers have information available to them (Finlay, 2010). The use of integrated marketing communication can enhance the ability of a company to provide valuable information to its customers. Integrated marketing information ensures all forms of communication and messages are linked together (Multimediamarketing, 2009). Hal Harley could improve the relationship with its customers after the sale using a variety of different methods. â€Å"Customer service is one of the most important parts of your companys overall strategy to conducting business† (Haycox, 2011). The firm can offer its new customers that purchase a motorcycle a subscription to a bikers club. The subscription would enable the company the ability to perform primary research by offering questionnaires to the customers. The questionnaires would be included inside a free monthly magazine. The information retrieved from the questionnaires can be used to enhance the customer service function of the company. Finlay, S. (2010). Internet Shoppers Get Lots of Vehicle Info in Minutes from Responselogix. Retrieved February 15, 2012 from

Reggae into the Contemporary American Society Essay

Reggae into the Contemporary American Society - Essay Example Regardless of the culture from which and individual hails, the common point is that a desirable culture should provide an individual with a sense of identity and the individual should be able to understand the dynamic nature of the world and be able to adjust to the changes encountered. Folk culture refers to the natural way of life that is defined by an ideal culture in a given community. This culture emphasizes on the human values like honor and the principle of reasoning and a view that the natural setting should be valued and considered wholesome. The spirit of hard work, self-discipline, and excellence are some of the aims of a folk culture, and which have currently lost grounds in the majority of the modern culture. Others include individual responsibility and loyalty to the authority. There are various ways through which communities preserve their cultural heritage to uphold their identity. The traditional cultural preservations include some ritual practices, traditional folk dances, folk tales, and folk music (Jankee, 2). The themes of the folk songs pointed out the cultural values like brevity, loyalty, and hard work. They often contained information on peaceful coexistence among the individuals in a given society. These traditional folk cultural expressions developed into the modern expressions with some deviations. Much of the human values that were emphasized by the traditional folk songs are not stressed in the modern Western cultures. The modern culture happens not to view nature as it was viewed earlier and neither does it allow nature to take control of life as in the olden days. There has also emerged a relation between the cultural expressions and grass root developments, especially in the developing nations. The different cultural expressions that are witnessed in different parts of the world are all concerned with the issue of defining the identity of the community.  

Early Civilizations Matrix Essay Example for Free

Early Civilizations Matrix Essay Affirmative Action The purpose of this paper is to review the subject of affirmative action, and the policies that go along with it. The paper will be recommending to a board of directors that their business implement affirmative action policies. This argument will be supported by points and facts that are in favor of the implementation. It will also fairly discuss points against the implementation of affirmative action. The paper will cover points about how affirmative action policies relate to compliance with the equal opportunity laws. Before getting to far ahead, it is important to make sure that there is a valid understanding of what affirmative action actually is, and what its policies stand for. What is affirmative action? Affirmative action means that steps are taken to help increase the representation of women, and other minorities in areas like education, employment, and business. These are all areas from which they have typically and historically been excluded. It is when these steps involve preferential treatment or selection based on gender, race, and ethnicity then the concept of affirmative action becomes controversial (Affirmative Action, 2001). History of affirmative action In 1961, then President John F. Kennedy issued executive order 10925 against American Lexicon. The order gave the first mention of affirmative action.  The purpose of the order was to end discrimination within the business (Nittle, n.d.). Next, three years later in 1964, The Civil Right Act came out. The goal of the Civil Right Act of 1964 was to stop employment and public accommodations discrimination (Nittle, n.d.). Following the Civil Right Act of 1964, President Lyndon Johnson, who took office after the assassination of John F. Kennedy, issued executive order 11246. This order required federal contractors to practice affirmative action, to help develop diversity within the workplace and help end race based discrimination, and other forms of discrimination (Nittle, n.d.). Before these amendments were signed into action, you had other key events that took place as well. For example, the case of Brown v Board of Education. This case was about an African American girl who wanted to attend a white public school, and was denied admittance. This case helped overturn a prior case Plessy v Ferguson. Plessy v Ferguson stated that a separate but equal America was constitutional (Nittle, n.d.). Brown v Board overturned that case by ruling that discrimination is a key aspect of racial segregation. Which meant that it violated the 14th Amendment (Nittle, n.d.). This decision started the countries goal to promote diversity in schools and various other places (Nittle, n.d.). This was a very important legal, as well as ethical case. It helped kick start the changes to peoples thought processes. Why affirmative action? Now that a bit of history on affirmative action has been covered, it is important to look at why affirmative action policies should be put into action at your company. Affirmative action would be very beneficial to your company for many reasons. It allows for a more diversified workplace, it is a way to allow all races to have equal rights, it shows that everyone has the ability to be great at their job, that people can be more productive by sharing various thoughts, plans, and ideas for the betterment of not only the company, but themselves as well, regardless of their gender, race, or ethnicity. This company should hire people based on things like their level of experience and skill, and whether they have the aspects necessary for that  position. The hiring process should not be based on the persons racial or ethnic background, or whether they are a male or a female. People should be comfortable enough that when they apply for a position within your company they do not worry about whether or not they are being discriminated against. All that should matter is that they have the skills necessary to do the job to the best of their ability. Not whether or not they are the proper gender or if they are the right ethnicity. If someone applies for a job at your company, and they feel they may have been discriminated against, and then they ask you about it, if you dont give them a reasonable response or answer them correctly it can cause problems for the company. Whether it be through long bitter court battles, or just the company gains a bad name for even potentially being prejudiced or biased. Employment discrimination against women and minorities is something that has gone on for a very long time. Government reports show that the pay, as well as job opportunities for minorities is smaller than that of white or Caucasian ethnicity ( Bohlander Snell, 2007). If your company implements affirmative action, it can be beneficial from the outside and inside as well. One thing that needs to be done to begin the action, is to develop a plan. Your company needs to have a written statement showing commitment to the idea of affirmative action. You should look at where the company stands in terms of women and minorities that you have employed. By doing so, it will allow for you to see where changes, if any, need to be made. Once you see where the improvements and changes are, you need to take the right steps to make sure these changes are made. While making these changes, you have to make sure that no other race or gender within your employee base was mistreated, or undervalued in any way due to the affirmative action plan. Equal employment opportunity law According to the Equal Employment Opportunity Law, all businesses have an obligation to uphold. They are not to judge a potential employee based on ones race, gender, age, etc. This is a very important aspect of affirmative action. You have to make sure that your company understands and follows the  policy ( Bohlander Snell, 2007). The court system is always interpreting the employment law. If changes are made, then it is the manager of your companys responsibility to change the companys employment guidelines to follow the court ruling (Bohlander Snell, 2007). To help make sure that business do comply with the changes, and anti discrimination laws, the Equal Employment Opportunities Council was established to monitor that the guidelines are being followed (Bohlander Snell, 2007). Benefits of affirmative action There are many benefits for your company to implementing an affirmative action plan. The employees themselves will benefit for instance, because minorities that are employed within your company have the chance to advance up the career ladder, and gain opportunities for promotions that they may not have had a chance of getting before. Your company shouldnt be made up of one race, one ethnicity, or one gender because you think that one is better than the other. If a person has or gets a job, it should be due to their qualifications and abilities to do the job correctly. Not based on race or gender. The downfalls of affirmative action With almost any argument in favor of something, you are going to have opinions refuting the ideas. Some believe that affirmative action leads to reverse discrimination. That instead of being hired for their qualifications and skill, that they are hired based on religion, race, gender, etc. Opponents feel that it can make people turn against one another. Preventing the downfalls of affirmative action The cons of affirmative action can be avoided as long as your company takes the proper steps. The company needs to look for the best people for the unfilled positions, and do the proper training if needed. To help prevent your employees from feeling as if the only reason they got the job with your company was due to their gender or race, make sure that you let them know they were hired because they had the needed experience or qualifications and therefore they were the best match. It is important to make sure that your company sticks to the plan that was laid out in the beginning, to the affirmative action plan that was developed. You watch over all of your employees, and not just those who are impacted more by the plan, the work environment at your company should stay sustainable and comfortable for all employees. Conclusion Affirmative action would be a great idea for your company. The purpose of this presentation was to show both the pros and the cons of implementing affirmative action within your company, which is hopefully what was done. The main thing to remember here is that the benefits to implementing affirmative action, strongly outweigh the pitfalls. Also, the opposition to the plan can be avoided by following your action plan, and the steps provided for avoidance of those downfalls. It is hoped that you will choose to use the affirmative action policy within your company, as it is something that will most definitely help and payoff in your companys future. References: Bohlander, G. W., Snell, S. A., (2007). Managing human resources (14th ed.). Florence, KY: Thomson Learning Higher Education. Nittle, N.K. (n.d.). Key events in affirmative action history. Retrieved from http://racerelations.about.com/od/historyofracerelations/a/TheFiveLandmarkEventsWhichLedtoAffirmativeActionsRise.htm Affirmative action. (2001). Retrieved from http://plato.stanford.edu/entries/affirmative-action/

Pellet Catalyst Development using Ferroxcube Process

Pellet Catalyst Development using Ferroxcube Process Pellet catalyst development using the Ferroxcube process The pellet preparation followed the classic routine of the powder metallurgy industry (NTUA): hematite (Fe2O3) or magnetite (Fe3O4) powders were homogenized in a plasticizer and greasing environment, within a rotating pan (Figure 7). Consequently, disks were pressed in a 150 bar hydraulic press (Figure 8). NTUA used the experience of CERTH (coordinators of the HYDROSOL projects to proceed in the proper preparation of the pellets). Figure 7. Rotating panFigure 8. The 150 bar hydraulic press After the initial pelletization by the hydraulic press, the pellets were undergone sintering and reduction in a controlled atmosphere (oxygen-reduced atmosphere) oven as shown in Figure 9, in order to obtain the magnetite phase certified by XRD, as shown in Figure 10. Figure 9. The sintering oven.Figure 10. XRD response of the sintered pellet, certifying the magnetite phase The porosity of the pellet and the neck development, offering substantial mechanical properties, have been monitored by SEM, as shown in Figure 11, as well as by the classic pressurizing methods. This way, the magnetite pellets have been stabilized in mechanical, electric and magnetic properties, offering mechanical robustness and electric resistivity below 10 Ohm or 3 à ¯Ã‚ Ã‚ ­Ohm.m (non-used pellet). Furthermore, an advanced manufacturing process has been proposed by the SUN Unit to the above-mentioned industrial technique. During sintering and reduction process, magnetic field can be added externally to the sintering and reducing ovens to magnetically orient the magnetite dipoles in the desired direction, allowing for advanced Lorentz force control. 2.2. A thin-film catalyst We have conceived and developed a thin film device for the hydrogen production which can be integrated in an automated system. The device can also be used for the reduction and oxidation process in oxide semiconducting films supported by metal substrates-wafers, even if they do not exhibit coherent magnetic order. The method is based on the Lorentz forces acted on the reducing oxidizing conducting electrons in the said oxide semiconducting films. Hence, this device can trap oxygen and hydroxyl from transmitted water, thus producing hydrogen. This such reduction and oxidation process in open air, as well as controlled atmosphere conditions. A particular application, useful for the HELENIC REF project refers to the three-layer depicted in Figure 15. The upper layer consists of a magnetite film not thicker than 500 nm, an insulating thin film supporting the magnetite film, not thicker than 500 nm and finally a metallic wafer made of Al or other metal, supporting the insulating and the magnetite thin film. Figure 15. Schematic of the catalyst Possible manufacturing methods include electrodeposition, physical vapor deposition, chemical vapor deposition as well as lithography and masking methods for the generation of electric contacts on the upper thin film. Concerning Fe3O4 (magnetite) film, a preferable but not obligatory condition is to be able to provide magnetic order in all grains of the ferrimagnetic cells of the oxide. This is achieved by magnetic field during deposition or by post-processing magnetic field annealing with subsequent field cooling. The desired properties of the Fe3O4 (magnetite) film are indicatively as follows: Structure of the magnetite phase, which can be certified by X-ray powder diffraction Multi-grained microstructure with small necks between grains, monitored by Electron Microscopy Resistivity below 10 kOhm, indicative of semiconducting phase Magnetic order, observed by monitoring the magnetic hysteresis loop Mechanical robustness observed by hardness and wear measurement Applying electric current through the metallic support of the film results in magnetic field parallel to the surface of the film and vertical to the applied electric current. The amplitude of this field is: Where I is the applied electric current and a the thickness of the film. If the thickness a (sum of the magnetite film and the insulating thin film) are less than 1 à ¯Ã‚ Ã‚ ­m and the current I is C Amperes, then the applied field is: Thus, the applied field is controllable by the applied electric current through the metallic support. This current can easily be in the order of one Amperes in dc mode or several tens of Amperes in pulsed mode, if the thickness of the metallic support is in the order of 100 à ¯Ã‚ Ã‚ ­m, thus allowing the transmission of magnetic field larger than 1 T in the vicinity of the oxide semiconducting film. Therefore, passing electric current through metallic support, one can simulate the magnetic field vertical to the direction of electric current passing through the magnetite thin film. The directions of these two electric currents characterizes the direction of the Lorentz force on the conducting electrons of the magnetite film. Parallel currents result in forcing the electrons towards the insulating thin film, while anti-parallel currents force them towards the surface of the magnetite film. These two different directions of Lorentz forces have a different effect on the operation of the magnetite thin film, acting as catalyst for the production of hydrogen. Passing electric current along the magnetite film, independent on the electric current passing through the metallic substrate of the magnetite film, (i.e. from another source), along the same direction of the current transmitted to the metallic substrate, results in a Lorentz force acting on the charge carriers (electrons) moving them from the surface towards the insulating thin film. Thus, the surface of the magnetite film becomes activated, in other words is reduced due to the removal of the mentioned Lorentz electrons. Activation is the generation of electron vacancies, offering the generation of new oxygen vacancies (excess of oxygen vacancies). Thus, the resistivity drops, and the applied voltage results in higher current, which increases the local temperature to 280 320C. Such temperature increase is observable by any kind of pyrometer. The temperature increase is dependent on the combination of the electric current passing through the oxide semiconducting film and the magnetic field transmitted to it due to the electric current passing through the metallic support. The effect is reversible and un-hysteretic: increase or decrease of the amplitude of I x H product, where I is the applied current on the oxide film and H the field resulting from the current on the metallic substrate, results in un-hysteretic and reversible increase or decrease of the temperature and reduction of the oxide film respectively. Such activation can be maintained even in open air: the competition between the Lorentz electrons based reduction and the free air oxidation finally results in oxidation which can also be macroscopically observed by the decrease of the activated (reduced) area on the free surface of the film. Having limited the current passing through the metallic support may result in activation (reduction) shrinkage. In this case, increasing the current transmitted to the metallic substrate before the radiation disappears, or before oxygen vacancy excess disappears, the oxygen vacancy excess is rejuvenated. Such rejuvenation is completely reversible by using the magnetic field produced by the current passing through the metallic support (in the order of 1 T). After complete oxidation (phase transformation of all the Fe3O4 film to Fe2O3) such oxygen vacancy excess and consequent reduction of the compound is impossible with magnetic fields of this order. The reduction and oxidation process can be monitored by measuring the surface resistivity of the magnetite film. Such resistivity depicts the increase or decrease of oxygen vacancies on the surface and consequently the bulk of the oxide pellet. Increase and decrease of this resistivity is equivalent to the oxidation and reduction of the resistivity of the surface respectively. This effect is observable in all types of oxide semiconducting films even in the absence of coherent magnetic order in them. To be able to observe this effect in oxide semiconducting films, they should be in a continuous solid state form, exhibiting even a small electric conductivity, and provided that magnetic field and electric current of proper waveform and amplitude are simultaneously applied on the semiconducting oxide film and the conducting (metallic) support. Such reduction mechanism can be used in the reduction of compounds passing on or through the film surface. Our focus is the reduction of pure vapor water to H2, by means of trapping the oxygen or the hydroxyl of the water molecule to the reduced (or activated) magnetite. Such oxidation with consequent hydrogen production can be reversed back to oxide reduction (activation) by means of stopping the water vapor transmission. This way, the two electric currents will reduce (activate) again the surface of the oxide film, provided that no water vapors are transmitted to the pellet surface or body. A certain application of such effect is the use of the said pair of Fe3O4 (magnetite) film with its metallic support for the production of hydrogen and oxygen from water vapors, using the following algorithm: Independent electric currents pass through the metallic support and the oxide semiconducting film in the same direction. Thus, the surface of the oxide semiconducting film is reduced (activated). Then, water vapor is transmitted on the surface of the oxide semiconducting film, resulting in oxygen trapping, hydrogen production and oxidation of the surface of the oxide semiconducting film. As soon as the resistance of the surface of the oxide semiconducting film exceeds a certain threshold, indicating reach to a critical level of oxide film surface reduction, the water vapor transmission is stopped. Thus, the oxide film surface is re-activated, followed by consequent oxygen release, until the resistance of the oxide film surface reaches a minimum threshold, indicating proper reduction (activation), which is proper for oxygen trapping. Then, water vapor is re-transmitted to the re-activated oxide film surface for hydrogen production. The production of hydrogen and oxygen is followed by an automatic storage of these two gases in different chambers to be used for any scope, like thermal combustion or fuel cell operation or other purpose. Development of the thin film catalysts The Dynamic Hydrogen Bubble Template (DHBT) is an excellent method for the fabrication of macrostructures with nanoporous side walls. The method has been named from the phenomena when a series of hydrogen-bubbles generated on the surface of the substrae act like a dynamic negative template. Figure 1 demonstrates the theoretical approach of the technique. Figure 1(a) illustrates the hydrogen-evolution taking place on the surface there is no metal/metal-oxide deposition. The size of the bubbles increasing along the distance from the substrate surface. Fig 1(b) shows the SEM-image of copper nanofoams prepared by DHBT. Figure 1. (a) Simplified description of DHBT generated metal/metal-based foams; (b) Honeycomb-like Cu-deposit structure made by DHBT. The electrochemical deposition procedure of the development of the catalyst is divided in two main parts. At first preliminary experiments on deposition of magnetite film were carried out in order to determine the orders of amplitude of the different involved parameters (current density, geometry etc.). , the electrochemical deposition of iron-oxide films was carried out as a preliminary approach. Based on the results of the characterization, the parameters of the deposition were varied in a high range in order to obtain 3D-structured porous nanofoams. The films were electrodeposited onto copper substrates (purity: 99.5%). The substrates were mechanically polished with 800 and 2000 emery papers, respectively. Henceforward, the polished substrates were ultrasonically cleaned in deionized water, ethanol and acetone, respectively. The 2 cm2 active surface area of the substrate was ensured by commercial nail-polish and insulating tape. The galvanostatic deposition was carried out in a two-electrode cell using a DC Power Supply. Platinum-mesh was used as counter electrode. Two different arrangement of the working electrode have been tested as shown in Figure 2. The electrolytic bath was a strongly alkaline solution with pH 12.5 made of 0.037 M Fe2(SO4)3.x H2O, 0.1 M triethanolamine (TEA) and 2 M NaOH. After mixing the components at T = 80 à ¯Ã¢â‚¬Å¡Ã‚ °C the solution had greyish-green color and no turbidity was observed. The parameters of the deposition process were varied in the terms of current density, bath temperature and deposition time. The range of cathodic current density was chosen j = 5-15 mA.cm-2, the depostion time was given from 5 min to 6 hours and the bath temperature was adjusted T = 60-90 à ¯Ã¢â‚¬Å¡Ã‚ °C. The nominal thicknesses of the prepared structures were calculated by using the Faraday-law. The surface morphology of the deposited film-layers were studied by scanning electron microscope (Nova NanoSEM 230) and the crystallographic characterization was determined by X-ray diffraction (Bruker D8 Advance, Cu radiation-40kV, 35mA). Figure 16. a) copper triangle used as working electrode (W) by turning the active surface towards the surface of the electrolyte b) copper-plate (W) used as working electrode by immersing it totally and by turning the active surface towards the counter electrode (C). Concerning the development of 3D-structured porous films, the substrate deposition was not changed (Cu-foil, purity: 99.5%). SiC polishing papers were used in grade of 800, 1500, 2500 and 4000, respectively as a surface pre-treatment. All the pre-treated samples were ultrasonically cleaned in deionized water, ethanol and acetone, respectively. In that case, the active surface area of the substrates was reduced to 0.5 cm-2 and fixed with nail-polish and insulating tape. The galvanostatic deposition was carried out in a two electrode cell using a BioLogic SP 300 potentiostat. Platinum-wire was used as counter electrode. Concerning the result of the film-deposition the arrangement of the working electrode was set in vertical position. The electrolytic bath, concentrations and its properties were the same as described above. The cathodic current density was varied in the range ofj = 0.075-1 A.cm-2, the depostion time was changed between 30 sec to 180 s and the bath temperature was adjusted T = 90 à ¯Ã¢â‚¬Å¡Ã‚ °C. Similar films have also been developed by using sputtering deposition and electron-gun aided deposition (Figure 17). Apart from the electrolytic method, thin magnetite films were also deposited onto insulating films by usign spuutering and electron gun physical evaporation at the NTUA. However, the obtained results on the porosity of the magnetite films are not comparable with the DHBT method and therefore they are not demonstratable at their current stage. Nevertheless, experiments are under way to obtain PVD films of the quality observed in the electrodeposited films. Characterization of catalysts Structural analysis The catalyst pellets were prepared by a proprietary process from Fe3O4 powders. IP SAS used Fe3O4 powder with declared purity better than 99% and nominal grain size of 2-4um supplied by chemicalstore.com, product code FE3O4M1. The phase composition determined by XRD (X-Ray Diffraction) is shown in Figure 38. Minor traces of Hematite can be observed at 32.8 ° 2Theta for the sample produced at IP SAS. Figure 38. XRD patterns from pellets prepared by SUN (red) and IP SAS (blue). Marked constituent phases are Magnetite (blue lines) and Hematite (black lines) A typical XRD response in the bulk SUN pellets and in bulk CERTH pellets is illustrated in Figure 1, demonstrating exclusive magnetite presence. Figure 1. XRD response of bulk pellets from SUN (left) and CERTH (right) illustrating exclusive presence of magnetite Phase transformations were studied by the means of in-situ XRD presented in Figure 41. Samples were mortar milled to obtain a fine powder that could be spread on the sample holder of the furnace. Milling force was kept minimal to preserve the structure of the pellet parts. Linear heating with indicated rate was used to obtain well-defined diffraction maxima with respect to the signal to noise ratio. Diffractometer was configured for parallel beam illumination with a secondary LiF monochromator to supress fluorescence from the Fe containing pellets. Formerly purely magnetite pellets are transforming to hematite in the vicinity of 300 °C. After the transformation no other phase change was observed. Pellets supplied by SUN exibit the transformation at higher temparature than the pellets prepared at IP SAS. This can be atributed to the smaller size of the Fe3O4 crystallites in the SUN pellets. Detailed pattern examination is shown in Figure 42. The studied powdered pellets exhibit only presence of magnetite and hematite respectively. Diffraction maxima at 26 ° 2Theta corresponds to SiO2 present as a thin layer grown on the non-reflective Si sample holder. Figure 41. In-situ XRD patterns of catalysts in air atmosphere with indicated heating rate Figure 42. In-situ XRD patterns of annealed catalyst pellets at indicated temperatures. Marked constituent phases Magnetite (blue lines) and Hematite (black lines).Catalyst prepared at SUN left, IP SAS right. Crystallographic study of the iron-oxide thin films samples was also realized. Figure 4 represents the identification of the observed peaks. Figure 4(a) shows the results of sample prepared in 3300 s in 70 à ¯Ã¢â‚¬Å¡Ã‚ °C bath with -5 mA.cm-2 current density. Grazing incidence XRD patterns of this sample indicate the presence of magnetite (blue lines) and copper substrate (green lines). Grazing angle was 2 (red curve) and 6 degrees (blue curve), respectively. In Figure 4(b) the results of sample with same conditions as in Figure 4(a) can be seen, but in this case the current density was -9 mA.cm-2. Here, grazing incidence XRD patterns indicate iron (grey lines) and copper (green lines). Grazing angle was 2 (red curve) and 6 degrees (blue curve), respectively. Figure 4(c/1) and (c/2) show the results of XRD taken from the same sample with deposition conditions of 2 hours deposition time in 85 à ¯Ã¢â‚¬Å¡Ã‚ °C bath and -12.5 mA.cm-2 current density. Figure 4. X-ray diffractograms of the iron-oxide electrodeposited samples prepared under different conditions. a, Άt=3300 s,T = 70  °C, j= -5 mA cm-2; b, Άt=3300 s, T= 70 °C, j= -9 mA cm-2; c/1, Άt=7200 s, T= 85 °C, j = -12.5 mA cm-2; c/2, powder scratched from the surface of sample c/1 In Figure 4(c/1) the grazing incidence XRD patterns were done on the sample with the substrate. Clear evidence of magnetite (blue lines), iron (grey lines) and copper as substrate (green lines). Grazing angle was 2 (red curve) and 6 degrees (blue curve), respectively. Figure 4(c/2) demonstrates grazing incidence XRD pattern of loose powder from the same sample as (c/1). Only magnetite phase (blue lines) is detected. Grazing angle was 2 degrees. The XRD results show clear evidence of magnetite if the current density does not exceed 8 mA.cm-2 cathodic current density (see Figures 4(a) and (b). Apart from that, XPS studies have also been performed after the check meeting. For integration reasons, they are demonstrated only in the Milestone 1 document. Microstructural analysis Morphology of pellets after preparation was studied by the means of SEM (scanning electron microscopy) shown in Fig. 39. The particle size is larger for the catalyst prepared by SUN. The particle size of sample prepared at IP SAS is in good agreement with the manufacturer specification and is rather homogenous in size distribution. Sample prepared at SUN is exhibiting a different size distribution ranging from very fine sub-micron particles up to particles with size increasing 50um shown in Fig. 39 and 40. As can be seen the porosity of the prepared pellets is higher for the pellet prepared at IP SAS. The grid shown in Fig. 40 is protecting the sample from being destroyed by the magnetic field in the microscope and thus contaminating the microscope system by fine magnetic dust in the pole-piece, lens and detector system. It is worth to mention that the particle size is not directly explaining the diffraction maxima broadening shown in inset in Fig. 38. This is due to the fact that the diffraction domain size is rather different than the grain size of a particle. We can surely state that the diffraction domain size is smaller in the pellet prepared at SUN rather than at IP SAS despite the observed grain-size distribution. Figure 39. SEM micrographs of catalysts prepared by SUN (left) and IP SAS (right) Figure 40. Low magnification micrographs of catalyst prepared by SUN (left) and IP SAS (right) Micrographs from the CERTH pellets (Figure 41) illustrate a clear evidence of necks, responsible for the significant reduction of temperature. Figure 41. Micrographs of the CERTH pellets, illustrating the presence of micro-necks, responsible for the improvement of the electric and mechanical properties Concerning the thin film catalysts, SEM analysis was performed. Figure 3 demonstrates 4 different SEM-images of the prepared samples. Fig 3(a) was taken on a sample prepared in 300 s deposition period in 60 °C bath with -7.5 mA cm-2 current density, and the nominal thickness was 2.24 ÃŽÂ ¼m. In Fig 3(b) can be seen the morphology of the sample prepared in 300 s at 70 °C with-5 mA cm-2 current densitywith nominal thickness of 23.55 ÃŽÂ ¼m. Fig 3(c) shows the SEM-result of the sample deposited with the same bath temperature and current density as 3(b) but extended deposition time: Άt = 900 s (dn = 30.28 ÃŽÂ ¼m). Fig 3(d) represents the SEM-image of the sample prepared in the highest bath temperature 90 °C with 5 min deposition time, -7.5 mA cm-2 current density (dn = 4.42 ÃŽÂ ¼m). The SEM-images clearly show the structural changes by increasing the bath-temperature. Filamentous deposit structure has been observed at 90 à ¯Ã¢â‚¬Å¡Ã‚ °C. Due to the galvanostatic deposition mode the potential values have been not recorded. For better understanding of the structural formations potentiostatic deposition mode should be done. Figure 3. SEM-images of the electrodeposited iron-oxide samples with different deposition parameters (a) Άt=300 s,T= 60 °C, j= -7.5 mA cm-2 at 30000X magnification (b) Άt=300 s, T= 70 °C, j = -5 mA cm-2 at 15 000X magnification(c) Άt=900 s, T= 70 °C, j= -5 mA cm-2at 10000X magnification (d) Άt=300 s, T= 90 °C, j= -7.5 mA cm-2 at 10000X magnification. Concerning nano-foam, due to the fact that the experiments were done in the close past the characterization of the prepared nanostructures was done only by scanning electron microscope. Figure 5 demonstrates the first promising results of the electrochemical deposition of iron-based 3D structures by using hydrogen generation on the surface as a negative template. Such a structure was a result of applying -0.375 A.cm-2 and more negative current density, namely -1 A.cm-2 with different depositing times. Fig 5(a) to Fig 5 (c) represents a possible building process of the 3D networks with pore size range in 2-6 ÃŽÂ ¼m. Other type of deposit can be observed at Fig 5(d) to Fig 5(e) with numerous dendrites along the pore-sides by using current density -0.375 A.cm-2 with different deposition times. The formation of porous layer is not so obvious like in the previous case, but the size of pores are close in the same range than the pores formed at -1 A.cm-2.

R.V. Keilty :: essays research papers

R. v. Keilty In the case R.v.Keilty the accused, Keilty, was charged and convicted of trafficking in narcotics. He then appealed to the Supreme Court of Canada on the grounds that the trial judge erred in law. The facts in the case were not disputed but the actual definition of possession under section 2 of the Narcotic Control Act was the issue. The appellant never actually did sell the narcotics nor did he at anytime have possession. It is illogical to convict a person of possession when they don't actually have possession as defined in the Criminal Code. Therefore is it logical to convict a person of trafficking if there were no narcotics? Crown arguments The actual possession is irrelevant because section 2 of the Narcotic Control Act states that trafficking means: (a) to manufacture, sell, give, administer, transport, send, deliver, or distribute, or (b) offer to do anything referred to in paragraph (a) otherwise than under the authority of this Act or the regulation The appellant obviously offered to sell the narcotics to the officer and as in R.v.Mancuso he should be found guilty. Also the actual physical possession is not necessarily needed to be proven as was in R.v.Russo where the defendant was convicted of possession and trafficking even though he did not posses at any time the narcotics. In the case R.v.Piscopo it was demonstrated that an accused can be convicted upon circumstantial evidence. The accused can be convicted using all of the aforementioned cases. Another issue is that if this case becomes precedent it would open a "floodgate" or loophole in the law where other criminals may escape through. This would allow for more dangerous dealers of narcotics, who operate their business "long distance" to escape prosecution because they never actually had the narcotics in their possession. Appellant arguments A person should not be stigmatized by conviction for a criminal offense they did not actually commit.. The case R.v.Vallancourt illustrates the use of the "stigma" test. A person who is convicted of possession should not be also branded as a trafficker of narcotics also. Another principle brought to the court from the R.v.Vallancourt case is that a crime requires a minimal state of mental blameworthiness. This means that the person must bear a certain degree of moral fault for what he did. To convict the accused of trafficking in narcotics when everyone acknowledges that there were no narcotics would seem to violate this principle. Using the rational connection established in the R.v.Oakes it would appear as if the government of Canada is trying to reduce trafficking but if a person who did not posses or sell any narcotics is

Heavens Delight - Vanilla :: Botany

Heaven's Delight - Vanilla Commercial vanilla is the fruit (capsule) obtained from several different species of Orchidaceae, namely, Vanilla pompona Schiede (West Indian vanilla), Vanilla tahitiensis J. M. Moore (Tahiti vanilla) and Vanilla planifolia Jackson (Mexican vanilla). The most important is Vanilla planifolia Jackson, from which almost all vanilla fruits come from (Ferrà £o, 1993). The genus Vanilla has about 100 species, and the Orchidaceae family is one of the largest in the Plant Kingdom, with more or less 20,000 species. Etymologically, the word vanilla came from the Spanish vainilla, which means a small pod, due to the great similarity between this fruit and a true pod (Ferrà £o, 1992; Mabberley, 1993). Floriculture is the field that we immediately recall when we think of orchid plants. However, the genus Vanilla is the only one of the family that is of direct economic interest. Some rural societies in Turkey and Greece still use salep, a staple flour made from the tubers of certain orchids, especially those included in the genus Orchis. Although the use of orchids for this purpose is rather localised, it is bringing some species of this genus to the edge of extinction (Baumann, 1996). The vanilla plant is a vine, native from the tropical forests of Central America and some areas of South America. In its natural habitat, it may reach a length of 25 meters, climbing with the help of adventitious roots. The stems are thick and fleshy green; the leaves are alternate, long elliptical, sessile and bright green. The flowers, in clusters, appear in the leaf axils. They live only 8 hours and die if fertilization fails to occur. The plant blooms three years after the cuttings are planted and the yellow greenish fruits many have up to 90,000 seeds, taking five to seven months to mature. The fruit is scentless when harvested, it has a length between 10 to 25 cm and a weight of 5 to 30g (Ferrà £o, 1993). Vanilla was brought to Europe by the Spanish conquerors of the New World. They found it in Mexico, when Montezuma, the last Aztec Emperor, offered them a drink made of chocolate, vanilla, red pepper and honey. Local aristocracy used it to flavor chocolate, a custom still practised today (Brosse et al. 1989). The Dutch introduced vanilla in Java (Indonesia), a former European colony in East Indies, at the beginning of the nineteenth century and the French did the same in the Reunion Island, Mauritius and Madagascar, all located in the Southwest Indian Ocean.