Accounting and Corporate Finance Essay Example | Topics and Well Written Essays - 2500 words

Accounting and Corporate Finance - Essay Example It follows the principals of having discounted cash flows. The formula to find out the Net present value precisely can be written as: Cash flow (today i.e. year 0) + Cash flow (1 year from now) [/1+r (cost of capital)]^1 + Cash flow (2 years from now)/](1+r)^2 Cash flow refers to the amount of expected cash to be received at a certain point in time X years from now. Cash flows can either be negative or positive. An inflow of cash is a positive cash flow such as an income whereas an outflow is represented with a negative sign and denotes an outgoing cash amount due to for instance expenditure. If the NPV of a certain project equals zero, it denotes that the project is a break-even project; working at no profit-no loss. In simple words it means that the amount of capital invested is exactly equal to the return that would be generated by undertaking the project. A project should be taken up or initiated only if the net present value is at least zero or greater than zero. Even though the calculations of Net Present Value are fairly simple and convenient, it is still quicker to use a financial calculator for these calculations because if there are a large number of cash flows, it will become very inconvenient and time consuming to make the calculations with the formula (Brigham et al, 2010). IRR (Internal rate of Return) IRR is the value where the NPV is equal to zero. It is the optimal value where a project is most beneficial. IRR can gauge the profitability of a proposed investment by taking into consideration the concept of discounted cash flows. IRR is not as easy to calculate as Net Present Value especially if each cash flow is different every year therefore it needs to be calculated using financial calculator. If not, then it is done on the basis of trial and error. The IRR can also be calculated in Microsoft Excel but it begins with guessing. IRR is very closely related to Net Present Value and it marks the next step to the calculation of Net Present Value. T he IRR is the yield at which the investments constitute of cash outflows and inflows that occur at a certain time period in a fixed amount (Helfert, 2001). Profitability Index: Profitability Index is basically a measure of the per dollar value of the initial investment spent on a project. This means that if a project’s PI is 1, then the project will give a break-even value of return in comparison to the initial spending done on it. If the value is below 1.0, it means that the project is going to incur a loss and the investment done on it will be greater than the relative return it will give back over the years. If the Profitability Index is greater than 1 then the project can be accepted as it will be giving a profit. For mutually exclusive projects, the project with the higher Profitability Index is a better option. It is calculated as: Present Value of future cash flows/initial cost (ACCA, 2008). Discounted Payback Period: Payback period is another technique used to measure the viability of projects in terms of the number of years that it takes to pay back an initial investment. It is measured in number of years till recovery and the following formula can be used to measure it. No. Of years prior to full recovery+ Unrecovered cost at beginning of year/Cash flow during full recovery year (Kinney et al, 2009). b) Discuss the results for the numerical examples NPV Year CF Project First CF Project Second 0 (1000) (1000) 1 500 500 2 600 400 3 700 300 4 800 100 Project First: (1000)+ 500/1.10^1+600/1.10^2+700/1.10^3+800/1.10^4 = -1000+ 454.54+

Opium War Essay Example for Free

Opium War Essay Introduction What is machine translation? Simply put, machine translation is the application of computer text from one natural language into another natural language text translation. The translation climax in the history of China again and again set off, the translation of Buddhist scriptures in the Eastern Han to the Tang and Song dynasties, the Ming and Qing technology translation and the Opium War to the May Fourth Movement to promote the progress of history. Today, the advent of the global information age is the translation climax conditions, requirements, involved in the field of computer science, mathematics, linguistics. However, the science of translation career how? Effects? How we will develop and make progress? In this paper, a review of the development of machine translation, disadvantages, role and prospects of superficial discussion, to answer these questions. i. A history of the development of machine translation The 17th century French philosopher, mathematician Descartes and the German mathematician Leibniz put forward the idea of using the machine dictionary overcome language barriers. In 1946, the worlds first electronic computer was born, after 50 years of development, through the tortuous road success, there are setbacks, presented numerous challenges for researchers. Machine translation potential social and economic benefits, some Western countries as well as Japan and other countries have spent a lot of R D, machine translation into the boom by its start-up period of the trough, the recovery period and make showing unprecedented prosperous and developed. The following is a brief overview of the various periods of its development. That is start-up period (1947 to 1954), Trough period (1954 to 1975), Recovery period (1975 to 1989),Prosperous Period. ii. The problem of machine translation The machine translation prosperity does not mean it does not have any problems. According to statistics, machine translation with human translation, translation accuracy and readability is less than 70%, many ways, there are a large number of problems, yet computer, language experts and machine translation users to jointly overcome. Opened the translation history at a glance the criterion the eyes of the beholder, the wise see wisdom. Three Kingdoms period follow essentially, Gavin ornaments East Jindao An best of Record, not so prejudicial statements were made tour word Tang Xuan Zang, neither shall seek the truth, and shall Yu vulgar to modern Yan Fu, letter the relentless pursuit of Dayak Chinese letter, Fu Lei quite similar , environment of Qian Zhongshu Gu Zhengkun best approximation . Tytlers three principles abroad, the famous translator Nidas dynamic equivalence the the fee Road Rove equivalents, otherwise Gorlee, alleged meaning on qualitative quantity. But are all demanding translation standards. The machine is translated as a translation, of course, should pay attention to the quality of the translation. The translation quality of machine translation can understand and loyalty, it is difficult to achieve the ideal standard. These examples to illustrate (1) The erroneous translation of part of speech and meaning. These problems with the machine error on the part of speech, meaning Discrimination are inseparable. Once the parts of speech in this connection vocabulary to syntax bridge is the wrong resolution, the translation will be wrong. Therefore, it is the wrong resolution mistranslation phenomenon should arouse the attention of machine translation researchers. (2)Adverbial wrong translation Of mistranslation. Such as the num ber and type of vehi2cles be misinterpreted as such a number of types of vehicles. Comparative sentence mistranslation. The earlier a smog alert can be issued, the greater its effectiveness is as it al2low s were wrongly translated: constitutes more time this smoke alarm can be as early as issued, the greater its efficiency as it does allow and the correct translation should be: the sooner the alarm, the greater the role, because it will make the Sketch word mistranslated. Small words, such as articles, conjunctions, English is not fluent in English. Chinese On the contrary, they become redundant, this machine translation can not be a good conversion. On these issues, there have been a lot of research, but always simple description, do not be traced. I believe that the key to these problems is not a simple computer program driving hard to the issue of slavery, but the context of the language itself is not a thorough analysis, we should ponder the question is how to make the machine with minimum knowledge. How to make the long-term accumulated cultural knowledge to penetrate into the machine translation. When they make the machine and from the search context, and in a certain culture play a role in its translation, what will? Mentioned Context, we can get some inspiration from the M alinow ski and Firth, Firth linguists task should be to study the text language phenomenon and its context combination, machine translation is the translation of a natural language another natural language should be set analysis, Discrimination select processing as an integrated process, asked to do , Shindaya. Gave us think of fruitRevelation, the word of the keys on the piano, alone has no effect. Keep context together makes sense. Another factor is the cultural context. Firth social scene decided to play social role social role is limited. Therefore, the social scene is also limited. Event enables the machine translation These limited role in society, the social scene analysis processing, translation will be able to improve the understandability credibility and While this robot suspected, but this is the trend. Since the machine translation represents the high-tech should be a breakthrough in the current information age. ii. The role of machine translation Machine translation through a saddle-type process, PaulDeposit and flourish, today turned into a tool, the reasonIt is its role in promoting. (1)Promote social progress Human leave no stone unturned to develop and complete a machine. Is translation systems, has developed a translation software, promoted by Economic development, social progress, eliminating the language in the world among people Introduction obstacles, communicate with the entire world. (2) Improve translation efficiency With the machine translation research has improved continuously, the field of translation achieved unprecedented success. In our translation work, We can make use of a variety of translation systems or software to complete the translation task, Samples can improve the speed and accuracy of the translation, translation efficiency. (3) Promote the development of other areas Machine translation to get involved in mathematics, computer science, linguistics, translation Science and other multi-discipline areas need strong development of these disciplines, substantial based on the outcome, so as to promote the development of these areas. Fourth, the outlook on the prospects for machine translation. The birth of the machine translation system, especially to people translation, who brought hope. Although machine translation the understandability and loyalty also not ideal, but if the mathematics, computer science, translation studies and language science and other researchers in the field of work together, will make the machine translation out more beautiful flowers, bear more fruit. Conclusion In the above mentioned, if the context of the language environment and cultural context for consideration in the process of programming, will be able to make the translation discourse stronger language three functions, namely the concept of function, people interpersonal function and textual function was more prominent. It is also the author most would like to suggest, hope, serve role. It should be believed that through the tireless efforts of many researchers make machine translation. Having been properly developed, thus will be able to promote vigorous translation cause development.

Understanding The Chemistry Of Nickel

Understanding The Chemistry Of Nickel Nickel is silvery white [1] and lustrous metal. It is the 7th most abundant transition metal and 24th most abundant element in the crust of earth. It has an atomic number of 28, atomic mass of 58.71 gmol-1 and atomic volume of 6.59 cm3mol-1 [2]. It belongs to group 10 (8B) and 4th period of modern periodic table. Nickel has electronic configuration [Ar] 4s2 3d8 [3]. It has property of malleability and ductility. 300 kilometers long wire can be drawn from a single kilogram of nickel. It has high electrical and thermal conductivities of 0.146 x 106 Scm-1 and 90.9 Wm-1K-1. It is hard, odorless and corrosion resistant metal that takes a high polish. Nickel crystallizes with face centered cubic structure. The unit cell has lattice parameter of 0.352 nm with atomic radius of 0.124 nm. Nickel is naturally occuring ferro magnetic and magnetostrictive material [4] at or near room temperature. Its curie temperature is 355  °C [5]. Nickel is mined from two types of ore deposits. These include laterites and sulphides. Laterites are silicate or oxide ores. It occurs most usually in combination with sulfur and iron in pentlandite (NiS.2FeS) which contains 1.5% nickel, with sulfur in millerite (NiS), with arsenic in mineral nickeline (NiAs) as a red nickel ore, containing 43.9% nickel and 56.1% arsenic, and with arsenic and sulfur in nickel glance [6]. 1.2 Chemical Properties of Nickel Nickel is relatively unreactive element. Under ambient conditions, it does not react with water, oxygen or dissolve in most acids. 1.2.1 Standard Reduction Potentials In aqueous solution, the standard reduction potentials for various oxidation states of nickel are shown in Scheme 1.1 [7, 8]. Scheme 1.1 Standard Electrode Potentials of Various Nickel Species 1.2.2 Reaction of Nickel with Halogens Nickel dichloride, NiCl2, nickel dibromide, NiBr2, and nickel diiodide, NiI2, are formed by the reactions of nickel with chlorine, Cl2, bromine, Br2, and iodine, I2. Ni(s) + Cl2(g) à ¢Ã¢â‚¬  Ã¢â‚¬â„¢ NiCl2(s) (yellow) Ni(s) + Br2(g) à ¢Ã¢â‚¬  Ã¢â‚¬â„¢ NiBr2(s) (yellow) Ni(s) + I2(g) à ¢Ã¢â‚¬  Ã¢â‚¬â„¢ NiI2(s) (black) 1.2.3 Reaction of Nickel with Acids Nickel metal dissolves slowly in dilute sulphuric acid to form solution containing the aquated Ni(II) ion together with hydrogen gas, H2. Ni(s) + H2SO4(aq) à ¢Ã¢â‚¬  Ã¢â‚¬â„¢ Ni2+(aq) + SO42-(aq) + H2(g) Ni(s) + HCl(aq) à ¢Ã¢â‚¬  Ã¢â‚¬â„¢ Ni2+(aq) + Cl- (aq) + H2(g) It does not dissolve in concentrated nitric acid, HNO3, because it is rendered passive by this reagent [9]. 1.2.4 Reaction of Nickel with Air Nickel in finely divided form reacts readily with air. At higher temperatures, it burns in oxygen to form nickel oxide. 2Ni(s) + O2(g) à ¢Ã¢â‚¬  Ã¢â‚¬â„¢ 2NiO(s) 1.3 Oxidation States The oxidation states of nickel include -1, 0, +1, +2, +3 or +4. The most prevalent oxidation state is +2, but compounds of Ni0, Ni+1, and Ni3+ are well known. Ni4+ has also been demonstrated [10]. 1.4 Nickel(II) Compounds Nickel is known primarily for its divalent compounds with all common anions, i.e. halides, hydroxide, sulfate, carbonate, carboxylates, sulfide and hydroxide. Green and blue are the characteristic colors of its compounds. Important nickel(II) compounds include: 1.4.1 Oxides Nickel oxide, NiO is a powdery green solid that becomes yellow on heating [11]. It can be prepared easily by heating nickel carbonate, nitrate or hydroxide. 1.4.2 Sulfides Nickel sulfides occur in different forms such as NiS, nickel sulphide, NiS2, nickel persulphide and Ni3S2, trinickel disulphide. 1.4.3 Halides NiCl2 is yellow but NiCl2.6H2O is of green colour. NiCl2 is prepared by NiCl2.6H2O + 6SOCl2 à ¢Ã¢â‚¬  Ã¢â‚¬â„¢ NiCl2 + 6SO2 + 12HCl NiF2 is prepared by treatment of anhydrous nickel(II) chlHYPERLINK http://en.wikipedia.org/wiki/Nickel(II)_chlorideoride with fluorine at 350  °C [12]. NiClHYPERLINK http://en.wikipedia.org/wiki/Nickel(II)_chloride2 + FHYPERLINK http://en.wikipedia.org/wiki/Fluorine2 à ¢Ã¢â‚¬  Ã¢â‚¬â„¢ NiF2 + ClHYPERLINK http://en.wikipedia.org/wiki/Chlorine2 1.4.4 Nitrates Nickel(II) nitrate hexahydrate, Ni(NO3)2.6H2O is highly soluble in water, giving emerald green solutions. 1.4.5 Carbonates Nickel(II) carbonate is a pale green polymeric solid consisting of Ni2+ cations and [COHYPERLINK http://en.wikipedia.org/wiki/Carbonate3HYPERLINK http://en.wikipedia.org/wiki/Carbonate]HYPERLINK http://en.wikipedia.org/wiki/Carbonate2- anions. It is readily decomposed by aqueous acids to give solutions containing the ion [Ni(H2O)6]2+, liberating water and carbon dioxide. 1.4.6 Sulfates The anhydrous form has a yellow to green color while NiSO4.7H2O and NiSO4.6H2O appears green and blue to pale green, respectively. 1.4.7 Hydroxides Ni(OH)2 occurs as green crystals that can be precipitated when aqueous alkali is added to a solution of nickel (II) salt. Its decomposition on heating above 230  °C produces toxic gases. 1.5 Nickel (III), Nickel (IV) Nickel (VI) Compounds The +3 oxidation state is found in dinickel trioxide, Ni2O3. NiO4-2 is an example of +6 oxidation state while NiO2 and NiF6-2 correspond to +4 oxidation states. Nickel(IV) also occurs in BaNiO3 and in the periodate salts, MNiIO6 (M = alkali cation, NH4). 1.6 Water Soluble, Poorly Soluble Insoluble Nickel Compounds In contrast to water soluble nickel salts (chloride, nitrate, acetate and sulfate), metallic nickel, nickel sulfides, and nickel oxides are poorly soluble in water [13]. NiCO3 is partly water soluble. 1.7 Nickel(II) Complexes Nickel in its most common +2 oxidation state displays a wider range of geometries in its complexes than any other metal ion with coordination numbers 3 to 6. Nickel(II) forms many complexes with octahedral [14, 15], square planar [16, 17, 18] and tetrahedral [19, 20] geometries and a smaller number of five coordinate compounds [21, 22] with square pyramidal and trigonal bipyramidal arrangements. Nickel(II) octahedral, trigonal bipyramidal, square pyramidal and tetrahedral complexes are paramagnetic and have in the majority of cases a green or blue colour. The square planar nickel complexes are diamagnetic and mostly have a yellow, red or brown colour. The ligand exchange processes for nickel(II) tend to be associative, while with palladium(II) and platinum(II), dissociative pathways predominate which tends to adopt only square planar complexes. 1.7.1 Six Coordinate Octahedral Nickel(II) Complexes Nickel(II) forms octahedral complexes with neutral ligands such as H2O and NH3. Amines displace some or all of water molecules in the octahedral [Ni(H2O)6]2+ ion to form complexes such as trans [Ni(H2O)2(NH3)4]2+, [Ni(NH3)6]2+ and [Ni(en)3]2+. These complexes are characteristically purple or blue in contrast to the bright green hexaaquanickel(II) ion, [Ni(H2O)6]2+ [23]. These octahedral complexes have two unpaired electrons and are paramagnetic with magnetic moments 2.9 to 3.4 BM. Other examples include dichlorobis(ethylenediamine)nickel(II), a blue solid, soluble in water and polar organic solvents [24] and Ni(acac)2.2H2O [25]. 2+ 2+ [Ni(H2O)6]2+ [Ni(NH3)6]2+ Ni(en)2Cl2 Ni(acac)2.2H2O 1.7.2 Five Coordinate Square Pyramidal Trigonal Bipyramidal Nickel(II) Complexes Several phosphine and arsine ligands form five coordinate trigonal bipyramidal complexes because tetradentate tripod ligands such as N[C2H4N(CH3)2]3 and N[C2H4PPh2]3 cannot span the apices of a regular tetrahedron. One face is left open for 5th ligand, e.g halide ion to form trigonal bipyramidal complex. Though hydride, thiolate, alkyl and other anionic ligands are also known; the complexes are therefore +1 cations. Tris(1,3-diaminopropane) chromium(III) pentacyanonickelate(II), [Cr(tn)3][Ni(CN)5] has square pyramidal [Ni(CN)5]3- anions. In contrast, crystalline tris(ethylenediamine) chromium(III) pentacyanonickelate(II) sesquihydrate, [Cr(en)3][Ni(CN)5].1.5H2O contains both square pyramidal anions and slightly distorted trigonal bipyramidal anions [26]. The trigonal bipyramidal structure is favored on the basis of ligand repulsion alone. For this reason, almost every five coordinate compound having non metallic central element such as PF5 has trigonal bipyramidal structure unless there are lone pairs. 1.7.3 Four Coordinate Nickel(II) Complexes Nickel(II) in its four coordination mode exhibits either tetrahedral or square planar geometry. 1.7.3.1 Tetrahedral Nickel(II) Complexes Nickel(II) tetrahedral complexes of stoichiometric types; NiX42-, NiX3L-, NiL2X2 and Ni(L-L)2 are known where X represents halogen, L is neutral ligand such as phosphine, phosphine oxide or arsine, and L-L is bidentate ligand such as ethylenediamine. Tetrahedral arrangement for Ni2+ will be preferred if the ligands are large and weak field. Ni(PPh3)3Cl NiCl42- [Ni(acac)2] 1.7.3.2 Square Planar Nickel(II) Complexes For the vast majority of four coordinate nickel(II) complexes, planar geometry is preferred for small and strong field ligands. Tetracyanonickelate(II) will probably be orange red colored square planar complex. Almost all planar complexes of nickel(II) with d8 configuration are diamagnetic. Important examples of square planar complexes are red bis(dimethylglyoximato) nickel(II) [27] and dichloro[1,3-bis(diphenylphosphino)propane]nickel, NiCl2(dppp). Ni(dmgH)2 NiCl2(dppp) [Ni(C2O4)2]2- [Ni(CN)4]2- 1.7.4 Three Coordinate Nickel(II) Complexes There are many examples of trigonal complexes for nickel(0), however, they are rare for Ni(II). The examples include dialkylamides [Ni(NR2)3]1- and Ni2(  µ-NR2)2(NR2)2 as well as blue mesityl complex [Ni(mes)3]1- which has approximately T shaped geometry [28, 29]. 1.8 Nickel(III) Complexes [Ni(tdt)2]- is nickel(III) square planar complex anion having coordination number four where tdt = 3,4-toluenedithiole. Other examples include [Ni(tacn)2]3+ with 1,4,7-triazacyclononane [30] and dark green air stable Ni(III) complex having donor NO2S2 chromophore [31]. Ni[(NO2S)2(C6H4)4] [Me(tdt)2]-, Me = Ni [Ni(tacn)2]3+ 1.9 Nickel(IV) Complexes A well established bis chelated complex of nickel(IV) is the diacetylpyridine dioximato complex [32]. Other examples include dicarbollide complex, Ni(closo-1,2-C2B9H11)2 [33] and the polyselenide anion [Ni4Se4(Se3)(Se4)]4- with a cubic Ni4Se4 core [34]. The hexadentate ligand 3,14-dimethyl-4,7,10,13-tetraazahexadeca-3,13-diene 2,15-dione dioxime forms pseudooctahedral NiN6 complex with nickel(IV) [35]. 1.10 Nickel(-I, 0, +I) Complexes The low valent oxides, K3[NiO2] and KNa2[NiO2] contain linear [O-Ni(I)-O]3- units [36]. The majority of nickel(I) complexes contain phosphine ligands and have tetrahedral or trigonal bipyramidal structure. They are paramagnetic as expected for d9 configurations. In Ni(CO)4, nickel is in zero oxidation state [37]. Bis(cyclooctadiene)nickel(0), Ni(C8H12)2 is a diamagnetic featuring tetrahedral nickel(0) [38]. Ni(cod)2 Ni(CO)4 1.11 Biological Role Nickel is a part of urease. [NiFe]-hydrogenases selectively oxidise H2. Carbon monoxide dehydrogenase enzymes consists of Fe-Ni-S cluster [39]. Other nickel containing enzymes include class of superoxide dismutase and glyoxalase [40]. Enzymatic reactions depend on redox activity of nickel atoms in enzymes active site. In fact, proposed mechanisms of NiFe hydrogenase [41], methyl-CoM reductase [42, 43] and NiSOD [44, 45] involves reduced (Nio, Ni+) and or oxidized (Ni3+) forms of nickel. Nickel along with iron plays vital role in transport of oxygen in blood. Nickel also acts as co-factor in absorption of iron from intestine. 1.12 Sources and Potential Exposure of Nickel Nickel is a ubiquitous natural trace element and it occurs in air, water and soil of the biosphere [46]. 1.12.1 Diet Food and drinking water [47, 48] are the major sources of nickel exposure [49]. Fats, chocolates [50], nuts, candies [51], tomatoes, bananas, onions, spinach, legumes, tea [52], white flour and all canned foods [53] are rich in nickel content. 1.12.2 Ambient Air Nickel oxide, nickel chloride, nickel carbonyl and nickel subsulphide are inhaled pollutants. Nickel levels in ambient air are in range 1 10 ng/m3 in urban areas, although much higher levels 110 180 ng/m3 have been recorded in heavily industrialized areas and larger cities [54]. 1.12.3 Tobacco Smoking It is major source of nickel in indoor air. A cigarette contains 1 3  µg of nickel. Nickel in a burning cigarette form nickel tetracarbonyl that is volatile and gaseous compound and badly affects respiratory tract [55]. 1.12.4 Occupational Exposure of Nickel Pulmonary absorption is major route of nickel exposure in industries [56]. The general population is also exposed to nickel in nickel alloys and nickel plated materials such as coins [57], jewellery [58], electric guitar strings [59], stainless steel cutlery, soaps and detergents. 1.13 Exposure Limits of Nickel The American Conference of Governmental and Industrial Hygienists (ACGIH) has assigned threshold limit value time weighted average for exposure to nickel compounds is 1.5 mg/m3 for elemental nickel, 0.1 mg/m3 for soluble inorganic nickel compounds and nickel subsulfide, 0.2 mg/m3 for insoluble inorganic compounds and 0.05 ppm for nickel carbonyl [60]. 1.14 Toxicity of Nickel Nickel is known as haemato, immunoto, neuro, geno, reproductive, pulmonary toxic and carcinogenic agent. 1.14.1 Acute Toxicity (01 day) The accidental inhalation of nickel carbonyl causes acute toxic effects in two stages, immediate and delayed. The immediate symptoms include headache, vertigo, irritability, which usually last a few hours, followed by an asymptomatic interval of 12 h to 5 days. The delayed symptoms are: 1.14.1.1 Nickel Itch Soluble nickel compounds on skin contact may result in nickel itch [61], most frequently when skin is moist. 1.14.1.2 Gastrointestinal Distress Nausea, vomiting and diarrhea were reported in workers who drank water, contaminated with nickel sulfate and nickel chloride. 1.14.1.3 Neurological Effects Giddiness and weariness were reported in individuals accidentally exposed to nickel sulphate and nickel chloride (1.63 g Ni/liter) with boric acid in drinking water [62]. 1.14.1.4 Pulmonary Fibrosis In humans and animals, nickel carbonyl causes pulmonary fibrosis. Nickel fumes are respiratory irritants and may also cause pneumonitis. 1.14.1.5 Kidney Damage Kidney damage and frank haematuria were observed [63]. 1.14.2 Subchronic Toxicity (10 100 day) A 6 weeks exposure of nickel fumes (0.07 1.1 mg nickel/m3) in humans caused an increase in air way and eye irritations, headaches and tiredness [64]. 1.14.3 Chronic Toxicity (> 100 days) 1.14.3.1 Dermatitis In sensitized individuals, it is most common effect due to nickel use in jewellery intended for pierced body parts and is often marked by itchy and red skin followed by skin ulceration [65]. 1.14.3.2 Respiratory Disorders Inhalation of nickel dusts and aerosols contributes to respiratory disorders such as asthma [66], pneumoconiosis and can also interfere with kreb ´s cycle. 1.14.3.3 Heart Failure Exposure of nickel tetracarbonyl to levels 50,000 100,000 times greater than levels normally encountered in food or drinking water can cause heart failure and variable degrees of cardiovascular system poisoning [67]. 1.14.3.4 Tumors Nickel powder can induce both epithelial and connective tissue tumors e.g. pelvic, renal cortical and liver tumors when given by subcutaneous, intramuscular or intraperitoneal injection [68]. 1.14.3.5 Kidney Poisoning Nickel in blood is mostly protein bound and accumulates primarily in kidneys resulting in kidney poisoning [69]. 1.14.3.6 Birth Defects Low birth weight infants with sensory abnormalities, such as hearing or sight loss and cardiac malformations are born with nickel exposed mothers [70, 71]. 1.14.3.7 Oxidative Stress Nickel(II) induces oxidative stress in humans [72, 73] by producing either reactive oxygen species, ROS or reactive nitrogen species, RNS. NiCl2 induces lipid peroxidation while ROS generated damage DNA. Nickel binds to DNA repair enzymes and generates oxygen free radicals causing protein degradation [74]. 1.14.3.8 Genotoxicity Ni(CO)4 inhibts DNA dependent RNA synthesis activity by binding to chromatin or DNA and thereby preventing action of RNA polymerase, causing suppresion of messenger RNA dependent induction of enzyme synthesis [75]. 1.14.3.9 Carcinogenicity Nickel subsulphide, nickel oxide, nickel sulphate as well as nickel sulfide fume and dust is believed to be carcinogenic [76, 77]. Independent international scientific bodies have classified mixed sulphidic and oxidic nickel compounds [78] as carcinogens to humans, inclusive of water soluble nickel compounds. There are higher chances of development of lung cancer, nasal cancer, and Prostate cancer in nickel exposed workers [79]. 1.15 Uses of Nickel 1.15.1 Nickel Alloys Nickel in alloyed form has made significant contributions to our present day society. German silver containing 10 30 % nickel is used for ornamental and domestic objects. Monel contains 68% nickel ands is used in apparatus for handling corrosive materials. Invar is important due to very small coefficient of expansion [80]. Nickel is principle alloying element in stainless steel that enhances its heat, corrosion, and stress rupture resistance [81]. Majority of stainless steels contain 8 10 % nickel. Its limitless uses include home and industrial products. 1.15.2 Nickel Electroplating Nickel electroplating is used for both protective and decorative finishes. Nickel chloride, NiCl2, nickel acetate Ni(OCOCH3)2, nickel nitrate, Ni(NO3)2.6H2O and nickel sulphate, NiSO4.7H2O are employed chiefly in nickel electroplating baths [82] while nickel oxide is used as electrolyte. Nickel electroplating changes the chemical, physical and mechanical properties of the workpiece [83]. 1.15.3 Catalytic Hydrogenation Raney nickel is used in a large number of industrial processes because of its stability and high catalytic activity at room temperature. It catalyses hydrogenation of vegetable oils. Soybean oil has been hydrogenated electrocatalytically on raney nickel with 90 100 % efficiencies [84]. Benzene is commonly reduced to cyclohexane using raney nickel for production of nylon. Reduction of Benzene to Cyclohexane Using Raney Nickel Raney nickel is used in reduction of compounds that have multiple bonds. Reduction of Thiophene by Raney Nickel De-Sulfurization of Thioacetals using Raney Nickel 1.15.4 Industrial Applications of Nickel 1.15.4.1 Heavy Industries Nickel based super alloys have high temperature applications in jet engines, gas turbines and rocket engines [85]. Monel can resist corrosion by sea water and is ideal for propeller shaft in boats and desalination plants. 1.15.4.2 Food Chemical processing Industries Monel and stainless steel are used in chemical and food processing industries due to better corrosion resistance at high temperature steam [86]. 1.15.4.3 Ceramics, Paints, Dyes Cosmetic Industries Nickel(II) phthalocyanine, C32H16N8Ni is used as bluish green pigment in the coloring industries [87]. The nickel titanium yellow pigments find great use in polymer and paint applications [88]. Nickel dimethylglyoxime (C8 H14 N4 NiO4) is routinely used as coloring agent in paints, cosmetics and certain kinds of plastics. NiO is used in making glass having ability to absorb visible light but transmits ultraviolet light [89]. In cosmetic products of many brands, the highest level of nickel in eye shadows is about 49 ppm [90]. 1.15.4.4 Textile Rubber Industry Nickel acetate is used as mordant in textile industry. Di-n-butyldithiocarbamate nickel(II) complex, Ni[CS2N(C4H4)2]2 is used as an antioxidant in tires. 1.15.5 Batteries Nickel batteries are dominant in the field of rechargeable electrochemical power sources due to their long cycle life, high power and a reliable performance. Ni(OH)2 is used as positive electrode to significantly boost energy densities in nickel alkaline batteries [91]. Nickel cadmium cells provide 1.2 V and are used in aeroplanes and emergency lighting systems. In industries, these batteries provide high voltage of 250 V with capacities about 5 Ah 100 Ah [92]. Nickel hydrogen (NiH2) battery cells with nickel oxide positive electrode are developed due to high power density and good thermal performance which make them attractive for use in electric vehicles, satellite and space power systems [93]. 1.16 Chemistry of Ligands 1.16.1 Thiourea (Tu) Thiourea, SHYPERLINK http://en.wikipedia.org/wiki/CarbonC(NHYPERLINK http://en.wikipedia.org/wiki/HydrogenH2)2 is lustrous white crystalline compound. It is useful sulfur donor thioamide and planar molecule, soluble in water and polar organic solvents but insoluble in non polar solvents. It has two tautomeric forms but in aqueous solution, thione form predominates. 1.16.2 N,N-Dimethylthiourea (Dmtu) N,N-Dimethylthiourea, C3H8N2S has appearance of colorless to white crystals. It shows coordination through sulfur. Fig. 1.10 Structure of N,N-Dimethylthiourea 1.16.3 1,1,3,3-Tetramethyl-2-thiourea (Tmtu) This substituted thiourea is white crystalline solid. It is sulfur donor ligand. 1.16.4 1,3-Diazinane-2-thione (Diaz) This six membered heterocyclic thione is sulfur donor ligand. 1.16.5 Imidazolidine-2-thione (Imt) It is a sulfur donor five membered heterocyclic thione [94] and has brown crystals. The peculiarity of Imidazolidine-2-thione is presence of a thiouredine fragment. It is planar with non-uniform distribution of à Ã¢â€š ¬ electron density and shows presence of maximum negative charge on exocyclic sulfur. Dipolar form B predominates in resonance hybrid. 1.17 Objective The primary objective of this study is to understand basic chemistry of nickel(II) and its complexes and gain an insight into metal ligand interactions in biological systems with following main objectives. To explore coordination chemistry of nickel(II) with various sulfur donor ligands and develop useful model for biologically active nickel complexes by determining structures of synthesized nickel complexes. Synthesis of nickel(II) complexes with thioamide and thione ligands. Crystallization of as many complexes as possible and determination of their structures by X-ray crystallography. Characterization of complexes by IR and UV-VIS spectroscopy. A comparative study of complexes based on spectroscopic and structural data.

Comparing Novel and Film Version of Snow Falling on Cedars Essay

Comparing Novel and Film  Version of Snow Falling on Cedars It is no easy task to create a work - through writing or film - that has an impact on society. In writing, one must discuss and analyze a relevant topic that will have an impact on the readers. One must also present stunning sensory images through words in order to create a complete understanding for the reader. In filmmaking it is not much different, but there must be striking visual imagery in combination with a fitting musical score in order to give the viewer of the film the full experience. There must also be historical accuracy, both in writing and film. In either case, it can take years to create such a captivating piece of work. David Guterson's novel Snow Falling on Cedars and its cinematic counterpart of the same name combine all of the aspects of good writing and filmmaking to create an emotionally provocative and historically accurate masterpiece.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  The story of Snow Falling on Cedars was set on a fictional island called San Piedro, somewhere in the Puget Sound area. The island had a thick history of generations of prejudice disguised by immigrant strawberry farmer life. The island was home to descendents of German, Swedish, English, and Japanese ancestry. When the Second World War arose, the people immediately panicked and reacted poorly to the Japanese American citizens. The story follows the lives of these Japanese Americans through their painful internment by the American government for what they termed the 'good of the union.' The story is also centered on several other subplots, including a biracial romance between a young couple, as well as the death of a white island fisherman named Carl Heine, Jr., and the trial of the Japan... ...racy and leads the reader or viewer to develop an intense emotional involvement with the story line. Both the novel and the film are remarkably vivid with the use of imagery and theme. The snow falling upon the cedars, as the prevalent image in both versions, functions as a beautiful metaphor begging for interpretation. The themes about the complexities of the human heart and the random distribution of both good and bad fortune are reinforced throughout the entirety of each work. The original work of pure genius - the novel, of course - deserves the credit for the incredible story behind Snow Falling on Cedars, but it is clear that the film followed in its antecedent's path with ease. Works Cited Guterson, David. Snow Falling on Cedars. New York: Vintage Books, 1995. Snow Falling on Cedars. Screenplay by Ron Bass and Scott Hicks, Universal Pictures, 1999.

Donald Duk Essay

Donald Duk is the story of a young man coming to terms of his identity as an American with Chinese descent and heritage. Donald felt that most Americans are prejudiced against Chinese so if he were to become American, he should reject his Chinese identity. Yet, at home, his parents also detest American culture. He began to be interested of his Chinese heritage because of the Central Pacific Railroad, which is a part of the Transcontinental Road built mostly by the Chinese immigrants. Upon reading Donald Duk, the interesting points of research include the immigration of Chinese to the United States, the reaction of Americans to immigration as well as the existence of racism and the way in which new generations of Chinese-Americans deal with issues of culture and identity. Outline for the Paper I. Reactions and thoughts on â€Å"Donald Duk† A. Responses to â€Å"Donald Duk† B. Literary Value of â€Å"Donald Duk† II. Issues Dealt with by â€Å"Donald Duk† A. Identity Crisis B. Chinese Immigration C. Racism in the United States Conclusion: How young Chinese-Americans in the United States Deal with identity and cultural issues. Annotated Bibliography Chao, R. K. (2003). Extending Research on the Consequences of Parenting Style for Chinese Americans and European Americans. Child Development, 72 (6), 1832-1843. Chinese parents do not know how to deal with the pressures and identity problems that beset their children. This journal article explores the issue and provides helpful recommendation for Chinese-American families. Chin, K. (1999). Smuggled Chinese: Clandestine Immigration to the United States. New York: Temple University Press. This book chronicles the history of Chinese immigration to the United States. What the immigrants did in the US and how they were brought there. This book can help provide background information about Chinese immigration. Chinese American Citizens Alliance. (2008). 65th Anniversary of Repeal of Chinese Exclusion Act. Retrieved 9 February 2009 from http://www. cacanational. org/. The Chinese Americans Citizens Alliance is a good source of facts and data concerning the experiences of Chinese Americans in contemporary United States. In addition to this, they may also have historical background and further information, which may serve as primary data for research. Rothstein, E. (2008). Museum Review: Seattle Asian Museum Moves Around the Corner and Into Its Identity. The New York Times, May 31, 2008. Retrieved 8 Feb 2009 http://www. nytimes. com/2008/05/31/arts/design/31muse. html? scp=2&sq=chinese%20american%20identity&st=cse. This museum review presents some information about Chinese and their role in the development of Seattle. The museum and the article, too, helps one understand the accomplishments of Chinese and Asians in the United States.

Business Etiquette Goodbye Message

Business Etiquette Goodbye Message (Issue 20: July, 2009) by Mary CullenIt is summertime, and my deepest wish is that you are enjoying some time off, rejuvenating and relaxing. Sadly, many in this economy are encountering forced time off. This issue looks at the challenging business etiquette quandry of how to professionally write a goodbye message if you have lost your job.It is painful to lose your job. Whether it is due to a merger, layoffs, poor sales or a personality conflict, so many emotions rage: worry, stress and resentment. There is a hilarious layoff scene in the movie "Broadcast News:"Manager: Now, if there's anything I can do for you...Employee: Well, I certainly hope you'll die soon. As much as we might momentarily feel better with this scathing retort, it will not help us find new and better work.Instead, respond professionally to the notification, close out all work responsibilities fully, and foster connection with all contacts. Here is an example of a good message notifying colleagues you are leaving:Hi Carmen, (If you are friendly enough for a personal message notifying the recipient of your departure, use the more personal salutation "Hi" followed by a comma. More on salutations.)Tomorrow, July 29, will be my last day at Acme Company. I'm departing to new adventures. I don't yet know what they'll be, but I'm sure they will be wonderful. (Without overtly stating so, it's clear this person did not leave for another position. Yet, there is absolutely no bitterness. If you know what you will be doing, state it here..."I will be taking time off to care for my infant son." or "I am entering an MBA program at Rutgers.")It has been a joy to work with you during my time here. You are so energetic and positive, and I sincerely hope we stay in touch and find future opportunities to work together. (State something truthful and specific about this particular recipient, so it feels sincere and targeted, not a mass email. Also indicate your desire to stay in touch.)Gerry Malvers (gmalvers@acme.com) and Suresh Patel (spatel@acme.com) will be your new contacts for procurement. Feel free to contact them with any questions regarding your accounting services in the future. I have given them your contact information and briefed them on the work you've done so well for Acme. (Provide clear information about how your recipient will connect with your company or department, and any relevant information they need.)I wish you great success, and hope we get to work with each other again! I look forward to your updates on Facebook and/or LinkedIn. (This assumes you are already connected on Facebook and LinkedIn. If not, tell them you will be sending them a connec tion request, or provide your own contact information on these networks. If you do not yet use LinkedIn or Facebook, let this be a reminder to establish your presence on these social networks before you may need it. This is most important - you have honed good relationships, so stay connected with them. If you do not use LinkedIn or Facebook, provide your personal email address instead.)Best regards,Jeanine Ready to commit to improving your business writing so it is a career advantage?