What is the role of War poetry Show how it has performed this role throughout history Essay Example

What is the role of War poetry Show how it has performed this role throughout history Essay Meticulous accounts of tragic occasions defined in the timeline of history, war poetry dates back hundreds of years, dignifying and glorifying the bravery of such young soldiers that died and survived, fighting for their country and their beliefs.Anglo-Saxon war poetry tended to be written directly at or after the scene of the battle, meaning the accounts could be accurate and have significant information included in them. For example, in The Battle of Maldon, the poet could record exactly what was said by Byrhtnoth and the leader of the Vikings, and write their speeches to every last word. In addition, the poet includes tiny little fragments of feature, for example Then Byrhtnoth spoke, board-shield raised, shook slender spear, gave speech This is evidence of how detailed the poem can become, by expressing little actions and positions the leaders and armies perform.Another large stylistic point of Anglo-Saxon poetry is their use of alliteration. The Battle of Maldons line structure is almost entirely based on alliterative words, containing at least two per sentence. For instance, Brave seamen sent me to you, told me to say you should send quickly silver for safety and itd be sensible for you and roused, resolute, made his reply. The effect of this is to create a sense of rhythm and impact for the reader, making the poem memorable for them and to strengthen the argument and opinion of the poem.In The Battle of Maldon, the Anglo-Saxon army is eager to fight and decline gold put forth by the Vikings. This shows that the Anglo-Saxons persuade people to fight for the good of their country instead of compromising, and they are proving that if you are a soldier then you will have eternal magnificence and immortality through poems, even if you do not win the war. For example, It would be humiliating for you to be off with our shillings to your ships without a fight, now so far youve made an entry into our country! The poet uses repetition of our in this sentence, emph asising, again, to defend your land and your will as a team.Shakespeares techniques were rather different compared to those of the Anglo-Saxons. He did not write at the sight of the war, but sometimes hundreds of years later. For instance, Henry V was written about one hundred years after the battle actually occurred; meaning Shakespeare could use his imagination more freely and decide how the story went for himself. However, this could also result in the poem not being completely exact and significant pieces of detail being left out, leaving it up to Shakespeare to create his own twists in the story. The result is a more imaginative account.Another interesting difference between Henry V and The Battle of Maldon is that Shakespeares Henry V was not written as propaganda, it was written for theatre. This is what Shakespeare mostly intended to write for. Therefore, rather than resembling poetry, his work was designed to be acted as a stage play and contained mainly long speeches and s oliloquies, for example the St Crispins Day speech in Henry V.A huge distinction between the Charge of the Light Brigade and the Battle of Maldon is the rhyme. For instance, Stormd at with shot and shell, While horse and hero fell, They that had fought so well Alliteration is used in the Battle of Maldon to give the poem a sense of rhythmic impact, whereas in the Charge of the Light Brigade, Tennyson used rhyme as an alternative. Consequently, the reader can read with more ease and direction, and there is a jollier, more regular rhythmic pattern to the poem.Another technique of The Charge of the Light Brigade is its repetition. For example, Flashd all their sabres bare, Flashdas they turnd in air. The outcome of this poetic method is to emphasise light flashing on a sword, which is a visual image.Disabled is a very contemporary poem in terms of vocabulary, grammar, image and style. It was written just after World War 1 by Wilfred Owen, probably the best known First World War poet. T his poem is very different compared to the others. It uses lots of enjambment, the structure and meaning of the lines of poetry being carried directly over to the next line without a break. For example, Only a solemn man who brought him fruits Thanked him; and then inquired about his soul. This is used effectively to create a feel of naturalistic motion in the poem.Furthermore, Owens use of depressing and vivid language and imagery give Disabled a much more disheartening tone than the other poems. For instance, He sat in a wheeled chair, waiting for dark, And shivered in his ghastly suit of grey. The effect of the saddening vocabulary, such as dark, shivered, ghastly and grey, and style in and of the poem help create a sympathetic approach towards the soldier whos lost all his limbs. Its putting you in the position of the young man, which helps you to realise his pain.Some war poems encourage participation in war, some discourage it. There have been some vast changes in war poetry t hroughout the centuries for many different reasons, and many poets have been recognised for those changes. However, you still have to notice some of the big and little similarities between them, and acknowledge that through all that has happened in history, knowledge has been passed on from generation to generation through an incredible and demanding art.

Censorship in Fahrenheit 451 essays

Censorship in Fahrenheit 451 essays Many things come to mind when the word censorship is involved. The Merriam Webster Dictionary states that censorship is stopping the transmission or publication of matter considered objectionable. In Ray Bradburys novel Fahrenheit 451, censorship plays an enormous role and is noted to be the most important theme. Themes are the fundamental and often universal ideas explored in a literary work. Censorship in Fahrenheit 451 has a major effect on the societys knowledge and characteristics in the novel. In the futuristic world Bradbury has created in the science fiction novel Fahrenheit 451, firemen start fires rather than extinguishing them. People of this society do not think independently nor do they have meaningful conversations. They dont even have an interest in reading books. Rather than that, they watch an extreme amount of television on wall-size sets and listen to Sea-shell radio which is attached to their ears. People drive extremely fast due to lack of appreciation for nature. It was a pleasure to burn. So goes the opening sentence of the Bradburys story. It grabs the readers attention and immediately tells where the unfortunate hero, Guy Montag, stands on the idea of book burning. Being the protagonist of Fahrenheit 451 Montag is by no means a perfect hero. Montags faith in his profession and his society begins to decline almost immediately after the novels opening passage. Montag comes across a gentle seventeen-year-old girl named Clarisse McClellan, who opens his eyes to the dark emptiness of his life with her innocent questions and unusual love for people and nature. Being faced with the complication of books for the first time, Montag is often frustrated, confused, and overwhelmed. He is often rash, unclear, self-obsessed, and too easily influenced. At times he is not even aware of why he does things, feeling that his hands...

Reflective Report Essay Example | Topics and Well Written Essays - 1000 words - 1

Reflective Report - Essay Example The research that I have done deconstructed my view and my perception of what is Nike. The horrendous experience of the workers of Nike is no small thing. People do work and take jobs so that they can have a better life. It is not something that one will do and yet at the end of the day one turns out to be more miserable; more miserable because one has experienced becoming less of a human and be treated as machine whose sole purpose is to produce. One can argue, as Bhagwati (2007) claims that Nike workers are better off, but that is not true. Hand to mouth survival is not human survival. It is the way animals in the jungle live. Unfortunately, this reality is experienced by the workers of Nike because the salary that Nike gives is not enough to feed and provide semblance of a good life to its workers, while Tiger Woods has been given millions of dollars. The injustice that Nike perpetuates in its factories bears witness to the deplorable condition of third world workers, who bounded by poverty and structural corruption in their own countries, have no better alternative in improving their lives. It is like the choice is between two evils – you suffer in the quagmire of poverty or work in Nike and hopefully one can have something to eat (even just a little). Workers’ stories show the other side of Nike, its dark side. I cannot help but be emphatic with the unethical working condition in Nike. As a student of management, the stories of the workers of Nike has shown me that management can really do something in making the lives of the workers better. The management is in the position to carry out company policies that will make the working conditions and the workers’ status improved, healthier and humane. This is our function and our vision as managers – as we try to gain profit for the company that we are servicing, we should never forget that there are also stakeholders of the company whose interest should also be upheld. The companyâ €™s stakeholders are as important as its shareholders. Their interest should be protected and addressed as the way to the present and future of management and of the organisation is finding the balance between shareholders’ interest and stakeholders’ interests. I believe that this is difficult but I also think that is the way management ought to be – responsive to both the shareholders and stakeholders concerns. I believe gone are the days when firms exist for profit and profit alone. It is not the way how the market responds now. The market is the people who see the importance and value of human rights, labour rights and corporate social responsibility. In fact, they are willing to pay more for products that hold up causes that they support and, at the same time, they are willing to withdraw support to products and corporations who have been unethical and abusive of their workers, of the environment and of their stakeholders. This is what happened to Nike. Some of their regular buyers refuse to buy their products anymore. I am one of them. Moreover, the research has opened to me the reality of the challenge that management faces in the current period. I think the unethical behaviour of Nike toward its workers is the standard of what should not be done. What has happened to the workers of Nike is not the norm in management and workers relation but it is that which should be avoided. Others may find me idealistic but the reality of the

Adam Smith's Theory Research Paper Example | Topics and Well Written Essays - 750 words

Adam Smith's Theory - Research Paper Example Born in 1723 and died in 1790, Smith left a legacy in his model Wealth of Nations that has been an influential contribution in economics. In brief, the theory identifies the basic principles that nation acquire wealth and function effectively when individuals use capital and proficiency at their own diplomacy. His model revealed the nature of country’s prosperity as many learn the principles of economics. Up-to-date, his arguments are used and cited in debates as many learn from his great insights. Nevertheless, some people disagree with his assumption as many view him as an activist of callous individualism. Regardless of the way he is viewed, his theory is paramount in the economics field. How the economy does stem from his theory and importantly economists assume that the theory is accurate in how the world’s economy operates. At this point, this paper seeks to analyze the theory and lay a discussion of its pros and cons. Wealth of Nations In his theory wealth of nat ion, Smith noted that wages and prices might reach optimal level when freedom of using capital and skills as per wish is imposed (Smith, In Cannan & Lerner, 1937). He taught by examples of new products, which he argued that, when invented prices are usually high until when others discover the profit potential, and join the field then prices go down. Indeed this can be outlined in today’s electronics where such scenarios take place. ... According to O'Rourke and Smith (2007), the theory explored that there cannot be consumption if there is no production. To explain further, Smith’s theory affirmed cars do not just exist there is a process through which they are put together in production to manufacture cars. Similarly, capitalism works in this way in the sense that when a car is manufactured, those in need of a car search for it in the car factory and purchase as per their choice of the car. In the 21st Century, people do not just walk in the car factory and request to purchase the car but they are purchased by a dealership and later sold to clients. The main point that Smith wanted to highlight is that, one can break capitalism in two parts consumption and production. In this case, there cannot be consumption without production and vice versa. Applicability This law is applicable in today’s society in that one cannot purchase products at the market without being manufactured and supplied by a differen t party. Still, one cannot eat without preparing or acquiring food and cannot be in a house that has not been constructed. From his theory, Smith assumed that the market force ensured there is right invention of goods and services. The theorist based his idea on the aspect of free market economy whereby consumers have the free will to choose what they need. Smith perceived capitalism as the main aspect, which drives, and motivate the economy. He believed that it motivates companies and individuals to gain and accumulate profits. To support his argument, Smith developed two theories through a research on production in Europe during industrial revolution. The two theories are moral sentiments and wealth of nations, which

The novel the help by kathryn stockett Essay Example | Topics and Well Written Essays - 1000 words

The novel the help by kathryn stockett - Essay Example The diverse views of the characters indicate the behaviour of the characters, which help us understand the character development in this novel. For the case of Skeeter, we see her change her priorities throughout the novel. For instance, at first, she aspires to become a journalist for a well-known paper; she began writing answers for a local magazine and later she is seen offering advice on cleaning and cooking among other house chores. The author makes Skeeter to appear different from other white women by exhibiting her bravely, which is admirable by the audience (Kathryn, 69). She comes out strong as a defender of the house help. She exposes all the bad life the maids undergo under the hands of her friends. This is true when we see her long-term relationship with Stuart ends. The character development of Skeeter can be well approached through a focus of her relationship with situations and other characters such as Constantine and her author Kathryn Stockett. One of the fundamental moves that shape Skeeter’s character development as the protagonist in the novel The Help is her decision to move away from the social helm held by the white women. This allowed her to shape her character as exemplary amongst the white dominated populace that lived discriminative of the black house cleaners. It is observable that her decision is not expectable in the setting of this novel. This implies that, she takes a bold step conscious of the outcome which includes discrimination by her friends, which is evident. It is satisfactory that, the Skeeter character revolves around her relationship with other characters and certain scenarios in the novel. In the thirteen chapters of the novel, Skeeter is seen as a character that seeks the truth, kind and committed to help the less advantaged in the society. Constantine is a black woman hired to take care of Skeeter. Skeeter turns to develop very strong and close relationship with the woman.

Mechanisms of Adsorption of Aormatic Nitrogen Compounds

Mechanisms of Adsorption of Aormatic Nitrogen Compounds MECHANISMS OF ADSORPTION OF AORMATIC NITROGEN COMPOUNDS AND AROMATIC COMPOUNDS ON METAL-ORGANIC FRAMEWORKS (MOFs) by JUN DAI Metal-Organic Frameworks (MOFs) constitute a class of novel porous materials which have attracted significant interest due to their application in separation, storage, catalyst and sensing. Large surface area and porous cavity make MOFs excellent absorbents with huge uptake capacity. In this paper, we studied adsorption mechanisms of adsorption of indole and naphthalene on Basolite F300, Basolite A100 and MIL-100 (Fe) by two complementary spectroscopic methods. Fluorescence spectroscopy and near-UV/Visible diffuse reflectance spectroscopy study demonstrate that naphthalene is quantum confined within the mesoporous cavity in F300. On the other hand, indole is weakly electronically bound to Fe (III) CUS in F300 and forms adsorption complex with F300. Direct spectroscopic proof of adsorption complex is provided by near-UV/Visible spectroscopy and fluorescence spectroscopy. Quenching of ligand-based fluorescence of A100 by indole is suggested and we propose adsorption of indole and napht halene onto A100 via Ï€-Ï€ interaction, spectroscopic proof is provided by fluorescence spectroscopy.   Table of Contents Title Abstract Acknowledgements and Dedication Table of Contents 1 Introduction 1.1 Metal Organic Frameworks (MOFs) 1.2 Clean Fossil Fuels 1.3 Nitrogen Aromatic Compounds in Fossil fuels 1.4 Aromatic Compounds in Fossil Fuels 1.5 Methods of Denitrogenation 1.5.1 Microbial Denitrogenation 1.5.2 Hydrodenigrogenation (HDN) 1.5.3 Adsorptive Denitrogenation (ADN) 1.6 Activation of Open Metal Sites of Metal-Organic Frameworks 1.7 Adsorption of Aromatic Compounds and Aromatic N-heterocyclic Compounds on mesoporous MOFs with CUS: MIL-100 (Fe) and F300 1.8 Adsorption of Aromatic Compounds and Aromatic N-heterocyclic compounds on microporous MOFs without CUS: MIL-53 and A100 1.9 Research Objective 2 Experimental 2.1 Metal Organic Frameworks 2.2 Solvents, Aromatic compounds and N-containing compounds 2.3 Activation and Hydration of Metal-organic frameworks 2.4 Fluorescence Spectroscopy 2.5 Near UV-Vis Diffuse Reflectance Spectroscopy (near UV-Vis DRS) 2.6 Model Fuels 2.7 Solid Mixture of Aromatic and Aromatic N-hetrocyclic compounds with MOFs 2.8 Stoichiometric adsorption complex of F300 and naphthalene in eicosane matrix 2.9 Kinetic adsorption of liquid indole on Basolite F300 (FeBTC) in liquid phase 2.10 Stoichiometric adsorption complexes of indole/naphthalene with MOFs 2.11 UV radiation 3 Results 3.1 Spectroscopic Studies of adsorption of naphthalene and indole on mesoporous F300 and MIL-100 (Fe) with CUS 3.1.1 Solid Mixtures of MOFs and organic aromatic compounds 3.1.2 Fluorescence spectrum of pure naphthalene List of Figures Figure 1: Structure of MIL-100 (Fe) (see as S1 in supplementary) Figure 2: Structure of MIL-53 (Al) (see as S2 in supplementary) Figure 3: Common nitrogen compounds existing in fossil fuels Figure 4: Pathways for the transformation of quinoline Figure 5: Fluorescence spectrum of (A) 0.08 M liquid solution of naphthalene (NAP) in n-heptane, ÃŽ »exc = 280 nm, bandwidth: Exc. Slit 5 nm/Emi. Slit 5nm. (B) 0.08 M liquid solution of NAP in n-heptane with multi-Gaussian curve fitting Figure 6: Fluorescence spectrum of (A) pure naphthalene (NAP) ÃŽ »exc = 280 nm, bandwidth: Exc. Slit 5 nm/Emi. Slit 5nm (B) pure NAP with multi-Gaussian curve fitting List of Tables Table 1: MOFs used in this research and structure information Table 2: Physical property of common nitrogen aromatic compounds existing in fossil fuels 1 Introduction 1.1 Metal Organic Frameworks (MOFs) Porous materials are well studied and widely used in science and engineering industry. Recently, a novel kind of porous material ‘Metal-Organic Frameworks (MOFs)’ has emerged as potential competitor. MOFs are crystalline hybrid inorganic-organic porous solid formed by chemical metal-linker bounding1. Metal-Organic Frameworks (MOFs) constitute a class of novel porous materials which have attracted significant interest due to their application in separation, storage, catalyst and sensing. The use of MOF as stationary phase in high resolution GC separation of aromatic hydrocarbons has also gained significant attention2. In comparison with adsorption on the MOFs in gas phase which has been well studied and understood, adsorption on the MOFs in liquid phase is much less known. MOFs have extremely large surface area and porous cavity, which make them excellent adsorbents with huge uptake capacity. As a class of coordination compound repeated by metal or metal clusters as SBUs (second building units) and organic linkers, the cavity ranged between that of Zeolite and mesoporous silica3. Regarding the structures, variety of MOFs can display either 2 dimensional or 3 dimensional structures depend on different organic linkers. It is also indicated by J. R. Karra and K. S. Walton that the relation between pore size and guest molecule size plays an essential role in the adsorption4. The MOFs being investigated in this research are mesoporous and microporous MOFs. For mesoporous MOFs the pore size can vary from 2 nm to 50 nm, while for microporous MOFs the pore size is less than 2nm. Pore size can be a key in adsorption on MOFs due to micropore filling mechanism2, which suggests adsorption capacity depends on molecular cross-sectional area rather than minimum diameter. MOFs are structurally stable under ambient environment. It is reported by many authors that MOFs remain stable under increased temperature and under oxygen. In this research, our investigation mos tly focuses on several common MOFS, and their commercial names are Basolite C300, Basolite F300, Basolite A100 and MIL-100 (Fe) (MIL=Materials of Institute Lavoisier). All Basolite C300, Basolite F300 and Basolite A100 are bought commercially, and MIL-100 (Fe) is made with the collaboration of Dr. Jing Li from Rutgers – New Brunswick. Table 1 shows the basic physical information of the MOFs used in this research. Table 1: MOFs used in this research and structure information MOFs/formula Surface area/m2g-1 Pore dimension/Ã… Pore dimension Ref. BET Basolite F300 1300~1600 21.7 3D Sigma-Aldrich,5 Basolite A100 1100~1500 7.37.7 1D Sigma-Aldrich, MIL-100 (Fe) 2200 25, 29 3D 5 MIL-100 family MIL-100(M) (M=Cr, Fe, Al) refers to a family of mesoporous Metal-Organic Frameworks built up from metal clusters and benzene-1, 3, 5-tricarboxylic (BTC) linkers. These MOFs possess large surface area and have recently attracted tremendous attention for applications in adsorption and separation due to the coordinated unsaturated sites (CUS) which can provide chance for Lewis acid-base interaction between guest molecules and metal ions or metal clusters. In Metal-organic frameworks, metal sites (SBUs) are coordinated with organic linkers. Open metal sites (CUS) may be available on these SBUs. CUS are very important in gas storage, separation, sensing, catalysts, and even biological systems6. Considerable amount of research on the adsorption of small molecules have been done recently. Evidence has shown open metal sites have essential influence on adsorption property in MOFs. It is reported that open Cu2+ metal sites in HKUST-1 contribute significantly to the high acetylene storage capa city7. Moreover, MOFs with CUS such as HKUST-1 are used in chromatography separation due to its specific feature to distinguish strongly and weakly electron donating analytes8. In additional, MIL-100 (Fe3+, Cr3+, Al3+) has been shown to have strong preference to adsorb N-heterocyclic compounds (Lewis base) in mixtures910. Hence, open metal sites can be potential Lewis acid sites, the possible interactions between guest molecules and open metal sites will be examined and discussed in this paper. In our research, MIL-100 (Fe) will be used to investigate the adsorption mechanisms between guest molecules such as indole or naphthalene and sorbent MOFs. Besides MIL-100, there is a commercially made MOF named Basolite F300, which has a similar chemical composition. Both Basolite F300 and MIL-100 (Fe) are built up by Iron and BTC linkers. However, due to the poor crystallinity, the actual structure of F300 is still not known at this time. Difference in iron content and carbon content in F300 and MIL-100 (Fe) is shown by D. Amarajothi and his co-workers5. The iron mass content in F300 and MIL-100 (Fe) are respectively 25% and 21%. The carbon mass content in F300 and MIL-100 (Fe) are respectively 32% and 29%. Pore dimension in F300 and MIL-100 (Fe) are respectively 21.7 Ã… and 25/29 Ã…. Structure of MIL-100 (Fe) is shown below: Figure 1: Structure of MIL-100 (Fe) (see as S1 in supplementary) MIL-53 family There are many types of MOFs that undergo hydrolysis, while there are other MOFs that remain stable within water. Water stable MOFs start to showing potential applications in drug delivery and imaging11. Many MOFs containing Al as metal sites and amino acids as organic linkers are stable in aqueous solution, and it is also possible to synthesize them in aqueous environment12. MIL-53(M) (M= metal as Al13, Cr14, Fe15, In16, Sc17) is a common family of microporous MOFs and has excellent water stability. Figure 2: Structure of MIL-53 (Al) (see as S2 in supplementary) The one dimensional pore structure of MIL-53(Al) is built by chains of corner-sharing octahedra aluminum clusters AlO4(OH)2 and anion form of benzene-1,4-dicarboxylic acid (BDC) as organic linkers connecting infinite numbers of metal clusters. MIL-53 (Al) has rhombic channels which have dimension of 7.3 x 7.7 Ã…. A huge Langmuir surface area of 1600 m2/g makes MIL-53 (Al) an efficient adsorbent. MIL-53 (Al) has extraordinary thermal stability up to 773 K. It is believed that the structure of MIL-53 (Al) undergoes a reversible structural change during process of adsorbing/desorbing water molecules, and is described as ‘breathing’13. The so-called ‘breathing’ process interchanges between large-pore (lp) form (Al(OH)[O2C-C6H4-CO2]) and narrow-pore (np) form (Al(OH)[O2C-C6H4-CO2]H2O) 13. The lp form has a dimension of 8.5 x 8.5 Ã… and is obtained when activated upon high temperature and under high vacuum, which takes away excess free BDC acids, oxygen and water trapped in the cavity during synthesis. The lp form is capable of adsorbing water molecules in vapor at room temperature, as a result, the MIL-53 (Al) shifts to its’ np form. As shown in the formula, the np form contains one trapped water molecule every unit or cavity. Hydrogen bonds are found to form between carboxylic groups on the linkers and adsorbed water molecules. Due to this ‘breathing’ feature, applications on selective adsorption of various compounds in gas phase have already gained interest and being reported14. The np form of hydrated MIL-53 (Cr) is able to selectively adsorb CO2 in presence of CH4 in gas phase. Upon adsorption of CO2 but not CH4, MIL-53 (Cr) returns to its lp form with an increased cavity volume of 1522.5 Ã…3 from np volume of 1012.8 Ã…3. In our research, we used Basolite A100 MOF from the BASF, which is commercially available and is equivalent to MIL-53 (Al). Similarly, A100 is build up with AlO4(OH)2 octahedral clusters connecting by BDC linkers, and gives a surface area of 1084 m2/g and pore volume of 0.51 cm3/g as determined by N2 physical-adsorption at 77 K. Additionally, XRD pattern of A100 is proved to resemble that of MIL-53 (Al)18. G. Blanco-Brieva and his co-workers have studied adsorptive removal of aromatic sulfur compounds from model liquid fuels on thermally activated A10019. 1.2 Clean Fossil Fuels Combustion of sulfur and nitrogen containing compounds in fossil fuels will bring adverse effect to public health, environment and economy. It is widely recognized that nitrogen compounds are normally carcinogenic and mutagenic. Separation of heterocyclic compounds from petro-chemical feedstock has become an urgent application leading to clean liquid fossil fuels. Fossil fuel is a primary source of energy on the earth, the intensive use of fossil fuels has raised environmental concerns. Beginning in 2006, the Environmental Protection Agency (EPA) began an ambitious program aiming to reduce the sulfur content of diesel fuels. As of July 11, 2010, the EPA required that the concentration of sulfur content in diesel fuels not exceed 15 ppm20. For certain ultra-clean gasoline, diesel fuels and jet fuels, sulfur level needs to be lower than 1 ppm21. Hydrodesulfurization (HDS) of diesel fuel has become an essential research interest, while the presence of nitrogen compounds in middle-distil late oil inhibits the ultra-deep hydrodesulfurization22232425. In HDS, sulfur compounds are hydrogenated to hydrocarbons and H2S over catalyst such as Zeolites9. However, the nitrogen aromatic compounds in crude oil are found to compete for the active sites on these catalysts to inhibit a deep HDS26,27. This gives rise to the necessity for denitrogenation in fossil fuels. Moreover, the combustion of nitrogen compounds in petroleum leads to the formation of NOx oxides, which is a group of highly reactive and persistent species and contributes directly to acid rain and greenhouse effect. The life time of NOx oxides in atmosphere is 120 years before being removed or destroyed through chemical reactions. The impact of 1 pound of NO ­x on warming the atmosphere is over 300 times that of 1 pound of carbon dioxide. EPA first set standards for NO2 in 1971, setting both a primary standard (to protect health) and a secondary standard (to protect the public welfare) at 0.053 parts per million (53 ppb), averaged annually28. Also the presence of nitrogen aromatic compounds in fossil fuels can lead to poisoning of refining catalyst, which will eventually cause a decrease in yield. Thus, denitrogenation is necessary for deep desulfurization and has drawn significant interest around the world due to the increasingly rigid regulations and fuel specifications in many countries. 1.3 Nitrogen Aromatic Compounds in Fossil fuels Fossil fuels are naturally-formed fuel that contains significant level of heterocyclic aromatic contaminants. There are some representative sulfur aromatic compounds such as benzothiophene (BT) and dibenzothiophene (DBT), representative nitrogen aromatic compounds such as indole and quinoline. Nitrogen aromatic compounds content in crude oil averages around 0.3%. Although the concentration of nitrogen compounds in crude oil is relatively low, the concentration turns out to be higher throughout the petroleum distillation process. Common nitrogen aromatic compounds in fossil fuels are shown in Figure 1.129 and physical properties of nitrogen aromatic compounds investigated in this research is shown in Table 2. Nitrogen aromatic compounds in fossil fuels fall into two classes. One is non-basic nitrogen compounds including indole and pyrrole due to the fact that the extra pair of electrons on N is contributed to the Ï€ electron cloud and is not available for interaction with acids. While the other class is basic nitrogen compounds such as pyridine, quinoline and their derivatives, in which the lone pair of electrons on N is available as an electron donor. Indole is one of the most common nitrogen compounds in fossil fuels, and it has been broadly studied. And we choose indole in our research due to the fact that indole is a weakly basic N-containing compound, which means it has a potential of selective adsorption against aromatic compounds and desorption is possible and reasonably convenient. Figure 3: Common nitrogen compounds existing in fossil fuels Table 2: Physical property of common nitrogen aromatic compounds existing in fossil fuels Compounds Formula Melting Point, ÃÅ'Ã…  C Density, g/cm3 Dipole moment, D Acidity,pKa Maximum diameter, ÃÅ'Ã…  A Indole C8H7N 52~54 1.17 2.11 16.2 6.9 Quinoline C9H7N -15 1.093 0 4.85 7.2 Isoquinoline C9H7N 26~28 1.099 0 5.14 7.2 1.4 Aromatic Compounds in Fossil Fuels Fossil fuels contain significant amount of hydrocarbons, most of them are aromatic compounds and polycyclic aromatic hydrocarbons (PAHs). In this research we choose naphthalene as representative aromatic compounds, and in order to investigate the adsorption mechanism we use fluorescence spectroscopy and UV-Vis diffuse reflectance spectroscopy to investigate electronic interactions upon adsorption onto MOFs. Naphthalene is the most simple and common aromatic compounds in PAHs. And naphthalene is commonly produced in petroleum refining and is then separated from the petroleum. Purification and separation of these aromatic rings is of interest in chemical industry. Naphthalene has a molecular length of 7.2 Ã… (largest diameter determined by ChemDraw 3D) and is non-polar. 1.5 Methods of Denitrogenation Microbial Denitrogenation Microbial process is an alternative pathway for denitrogenation. Microorganisms are known to consume natural organic compounds and convert them into carbons and energy, and they are capable of metabolizing certain molecules including nitrogen compounds from fossil fuels. The degradation of quinoline is well-characterized, and the transformation pathways are elucidated by M. Benedik et al29 (shown in Figure 1. 5). The degradation of isoquinoline is less understood but 1-oxo-1,2-dihydroisoquinoline is suggested as initial oxygenated product30. According to the finding of Claus, G, indole is readily degraded via catechol or transformed directly into tryptophan30, while carbazole is relatively more difficult to be degraded. One possible degradation pathway31 beginning with angular dioxygenation has been proposed by Ouchiyama, N., which finally enters TCA cycle after conversion to catechol or tryptophan32. Mechanisms for the degradation of other nitrogen compounds such as pyridine, quinol ine, acridine and their derivatives are reviewed in detail by J. Kaiser33. Recent research in microbial denitrogenation has revealed a promising future for application in selective removal of nitrogen- and sulfur-containing petroleum. However, as a major mechanism for the removal and metabolism of organic compounds from the environment, its’ characterization of the enzymes involving in the pathways is still under research29. And it has not been widely applied to the industry yet. Figure 4: Pathways for the transformation of quinoline Hydrodenigrogenation (HDN) Hydrodenitrogenation (HDN) is usually used to remove nitrogen compounds in fossil fuels during the refinery process, and Co-Mo catalyst is normally involved in the process. However, the HDS process is accomplished by reacting with hydrogen at high temperature and high pressure. It is energy-intensive, hazardous and costly. Thus, significant amount of researches have been done on HDN in order to reach a goal of being economic and environmentally friendly. Adsorptive Denitrogenation (ADN) Another promising way to selectively remove the nitrogen compounds in fossil fuels is adsorption on a porous material, Activated carbon34353637, Zeolites38, HCL-loaded silica-aluminas39, ion-exchange resins40, meso-silicas41,42, Ti-HMSs43, microporous carbon44, activated aluminas45, Ni-based adsorbents45, and NiMOs46 have been used for ADN. While recently the use of MOF adsorbents has gained significant interest in adsorption and separation of aromatic and heterocyclic compounds in liquid phase due to its’ high capacity, high selectivity, economic importance and most importantly energy saving 47. Moreover, MOFs can even be recycled and effectively reduce the cost. Adsorptive separation via â€Å"adsorptive denitrogenation (AND)† is preferred over industrial catalytic HDN10. Specifically, selective adsorption of N-heterocyclic compounds48 in presence of aromatic and aliphatic hydrocarbons in liquid phase49 is of interest, which is investigated in this research. 1.6 Activation of Open Metal Sites of Metal-Organic Frameworks Available CUS in MOFs is essential for the adsorption of Lewis basic compounds. Thus, to fully utilize the open metal sites in MOFs, activation is needed to evacuate the water molecules which are relatively weakly coordinated on these metals. Because MOFs are strongly adsorptive molecules, humidity can be crucial to the availability of open metal sites in MOFs. Specific treatment is necessary at certain temperature under vacuum in order to activate open metal sites. And protection of the sample against humidity is critical during experiments. Interestingly, it is discovered by K. Schlichte and his colleagues that upon activation the color of HKUST-1 would change from light cyan to dark navy50. This is confirmed by E. Borfecchia and his working group using UV-Vis, a red shift at LMCT edge and appearance of a shoulder in d-d band at around 600 nm in UV-Vis spectrum is observed and explained by the removal of water51. In addition to the activation of MOFs, partial reduction of MIL-100 (Fe) has been reported by H. Leclerc and his group52. Certain metal sites in MOF can be reduced, for example, Fe3+ in MIL-100 (Fe) can be reduced to Fe2+. According to their analysis of oxidation states via IR, outgassing at 423 K for 12 hour will give rise to a greater proportion of Fe2+ sites while minority of Fe3+ sites is reduced. However, outgassing at 523 K will result in that most Fe3+ sites are reduced. Fe3+ sites are more Lewis acidic sites than Fe2+, it is easier for Fe3+ to form coordination bond with nitrogen aromatics, which are good Lewis base. 1.7 Adsorption of Aromatic Compounds and Aromatic N-heterocyclic Compounds on mesoporous MOFs with CUS: MIL-100 (Fe) and F300 Although adsorption of small organic molecules on MOFs both in liquid phase and in vapor, such as toluene, benzene, xylene isomers2, etc., has been well studied in the recent years, to our knowledge the adsorption of fuse-ring aromatic hydrocarbons on MIL-100 in liquid phase has not been reported. M. Maes and his co-workers have reported adsorption of indole from heptane/toluene mixture solution on MIL-100 family9. Thus, mechanism of adsorption of aromatic compounds versus aromatic N-heterocyclic compounds on F300 has not been studied. According to many studies, the formation of complexes in liquid adsorption is usually assumed, but there is a lack of direct spectroscopic evidence. Adsorption of small aromatic ring compounds (benzene and p-xylene molecules) on MIL-101 has been published by K. Yang, et al2. Pore-size filling mechanism is discovered and discussed in this paper, indicating that pore-size and different substrate relates with molecular selectivity of organic compounds. Ho wever, the mechanism is still not understood. Fluorescence spectroscopy is a straightforward method for studying the adsorption mechanism between guest molecules and MOFs. Yet there are rarely papers studying characterization of adsorption of aromatic compounds in liquid or solid system by fluorescence spectroscopy. It is assumed based on fluorescence spectra that Lewis acid-base interaction promotes the adsorption of pyrene on Al2O3 from model fuel using octane as solvent53. While the fluorescence spectra was collected using a model sorbent aluminum chloride in methanol instead of actual Al2O3 in model fuel, spectroscopic characterization of adsorption complexes formed by MOFs and aromatic compounds or aromatic N-heterocyclic compounds by the fluorescence spectroscopy is still unknown to our knowledge. Another useful characterization method is near-UV/visible diffuse reflectance spectroscopy (DRS), which is excellent at detecting the variation or shift in electronic states on adsorption complexes forming by metal sites and guest molecules. The DRS was used to identify the interactions between aromatic amines and MOFs54 but it has not been used to explore the interactions between metal sites of MOFs and guest molecules as aromatic compounds or aromatic N-heterocyclic compounds. Thus, we aim to investigate the adsorption of large aromatic compounds on MOFs using two spectroscopic methods as fluorescence spectroscopy and near-UV/visible diffuse reflectance spectroscopy. 1.8 Adsorption of Aromatic Compounds and Aromatic N-heterocyclic compounds on microporous MOFs without CUS: MIL-53 and A100 M. Maes and his colleagues have studied the adsorption of indole and methyl-substituted indole present in model fuel (heptane/toluene at either 80 vol. %/20 vol. % or 20 vol. %/80 vol. % combination) at initial concentration of 0.15 M on thermally activated MIL-53 (Al)9. The amount of absorbed indole intensively dropped in model fuel with toluene, which indicates a possible competitive adsorption. While no data of adsorption capacity for indole and substituted indole on MIL-53 (Al) in n-alkane solvent was reported, not enough experimental evidence or computational evidence can be used to prove the mechanism of competitive adsorption. Similarly, adsorption of indole, pyridine, pyrrole and quinolone on thermally activated MIL-53 (Al) has been studied in another paper. In this paper n-octane was used as solvent, however, no data for adsorption capacity of indole on MIL-53 (Al) has been reported55. Ï€-Ï€ interactions is suggested to be the major force that introduce the adsorption of indole or quinolone onto activated MIL-53 (Al), but no experimental evidence was given55. At the present time, no direct spectroscopic characterization of chemical bonds between aromatic or hetero-aromatic adsorbate and MIL-53 has yet been reported. Furthermore, adsorption of naphthalene on MOFs has not been reported to our knowledge. To investigate the adsorption mechanisms through fluorescence spectroscopy, it is essential to know the origin of the fluorescence from MOF itselft. It was discussed in a review paper by M. Allendorf, C. Bauer, R. Bhakta et al.56, that there are five modes for generating fluorescence in MOFs: linker-based, framework metal ions (charge transfer between linker and metal), adsorb

The Color Purple Essay -- essays research papers fc

The Results of Celie’s Physical and Mental Abuse   Ã‚  Ã‚  Ã‚  Ã‚  In 1982 Alice Walker titled her Pulitzer Prize Winning novel, The Color Purple, which is symbolically meant to reflect radiance and majesty (Columbia). It is a story, entirely conveyed through letters, of one young black girl’s struggle to escape the brutal and degrading treatment by men, which had become a constant part of her life. Instead of focusing on race throughout the novel Walker accords â€Å"greater importance to power, the power to be, to concretize one’s self, as to mold others† (Dieke 102). This completely unbalanced power ultimately leaves Celie feeling alone and controlled, which affects her relationships with men and influences her relationship with women, mainly Shug Avery. The horrifying effects of rape and what Celie thought was incest so greatly scarred her for the rest of her life that she lost the ability to love, became confused about her sexuality, and subconsciously denied her right to an identity.   Ã‚  Ã‚  Ã‚  Ã‚  For a considerable amount of time Celie blindly accepted the fact that she would be treated like a slave in her own home. As a result, Celie demonstrated intense fear and a complete lack of love toward her husband. Because Mr. _____ had originally wanted to marry Celie’s older sister Nettie he felt that in settling for Celie he had the right to treat her as his property. Celie was completely aware of these arrangements â€Å"Mr. _____ marry me to take care of his children. I marry him cause my daddy made me. I don’t love Mr. _____ and he don’t love me† (Walker 57). As opposed to most marriages being based on trust, love, and commitment, their bond was based on authority, obedience, and service. Mr. _____ immediately brings Shug Avery into his home when he heard that she was sick so that Celie could take care of her along with his children from a previous marriage. After a short period of time Celie learns about their past and about Mr. _____’s current feelings for Shug. Celie’s blatant disregard to Mr. _____ sleeping with Shug again displays complete apathy toward her husband. Mr. _____’s aggressively dominant role does not denote the conventional husband/wife relationship it seems to more closely represent a master/slave relationship. Mr. _____’s constant oppressive presence causes Celie to live in continuous fear. Celie explains that M... ...novel Celie’s traumatic experiences have had a great impact on the entirety of her life. Once married she constantly lived in fear being incapable of love and unable to control her misguided sexual emotions.   Ã‚  Ã‚  Ã‚  Ã‚   Bibliography Bradley, David. â€Å"Novelist Alice Walker: Telling the Black Woman’s Story.† New York Times Magazine 8 Jan. 1984: 24-37. Dieke, Ikenna. Critical Essays on Alice Walker. Westport:   Ã‚  Ã‚  Ã‚  Ã‚  Greenwood Press,1999. Gates, Henry Louis Jr. and K.A. Appiah. Alice Walker   Ã‚  Ã‚  Ã‚  Ã‚  Critical Perspectives Past and Present. NewYork:   Ã‚  Ã‚  Ã‚  Ã‚  Amistad Press Inc, 1993. http://www.Womenshistroy.about.com â€Å"Race and Domesticity in The Color Purple† African American   Ã‚  Ã‚  Ã‚  Ã‚  Review 29 #1 Spring 1995:67-82. The Columbia Encyclopedia, Sixth Edition Copyright 2001   Ã‚  Ã‚  Ã‚  Ã‚  Columbia University Press. Walker, Alice. The Color Purple. Orlando: Harcourt Brace   Ã‚  Ã‚  Ã‚  Ã‚  Jovanovich Publishers 1982. Walsh, Margaret. â€Å"The Enchanted World of the Color Purple.†   Ã‚  Ã‚  Ã‚  Ã‚  Southern Quarterly 25 (1987): 89-101.