Asymmetric Hydrogenation of Ketones——Design of Chiral Catalysts

Asymmetric hydrogenation of ketones is one of the most reliable methods for obtaining chiral secondary alcohols. This transformation is not only of academic interest, but also of industrial significance because of its simplicity, environmental friendliness, and economic viability. Chiral RuXY（binap）（1,2-diamine） complexes （BINAP= 2,2＇-bis（diphenyl-phosphino）-1, 1＇-binaphthyl,X = Y = C1 or X = H, Y = BH4） with or without a strong base catalyze rapid, highly productive asymmetric hydrogenation of various simple ketones in 2-propanol. This reaction, unlike conventional hydrogenation,     

On Tess of D''''urbervilles——The Analysis of The Tragedy of Tess

Hardy's masterpiece Tess of The D'urbevilles depicts the heroine's miserable life,revealing out the objective cause of society reality and subjective cause of heroine's own character.Society objective reality cause is a hypocritical capitalism morality standard,heroine's own weck character is but:Dare to resist tradition morality being not able to shake off that,and whose double character were yoke her completely.     

Eustacia——Victim of Fate——On Thomas Hardy''''s The Return of the Native

Owing to the influences of Greek's view of fate, Dorset peasant's fatalism and Schopenhauer' s pessimistic philosophy, Hardy showed more or less a pessimistic tendency in his early writings and this tendency illustrated itself in his writing of Eustacia, heroine of The Return of the Native. He believed that Eustacia' s tragedy resulted from the disagreement between her aspiration for a brilliant life outside Egdon Heath and the fate imposed on her by some mysterious force working at odds with her. This is what the paper attempts to prove.     

Judgment of Parameters Correlation——Comprehensive Method

Researching parameters correlation is important to analysis of reliability uncertainty for passive system. The only criterion for traditional method to determine the parameters correlation is the correlation coefficient threshold. This method is subjective and needs improvement. Taking loss of normal feedwater accident of AP1000 passive residual heat removal system( PRHRS)as example,a comprehensive method was proposed to resolve the subjectivity problem of traditional method. Comprehensive method took account of scatter diagram of parameters and thermal transmission rule and significance testing of correlation coefficient comprehensively when judging parameters correlation. By comparing the effect of parameters judged by traditional and comprehensive methods respectively, we found the distance of traditional method was larger than that of comprehensive method,showing some parameters impacting thermal transmission rule removed by traditional method and comprehensive method could judge more precise and scientific parameters. So comprehensive method should be used to judge linear relation between parameters and thermal transmission rule.     

Splitting of abelian—by—hyperfinite groups

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Doom of American Dream——The Social Meaning of The Great Gatsby

The paper holds that the presentation of Gatsby as unique to America signifies that Gatsby's personal dilemma and failure are the dilemma and failure of American nation, thus satirizing the illusory nature of the American Dream and the impossibility to attain it.     

New strategies of protein engineering——directed evolution of enzyme in vitro

New and highly effective strategies for directed enzyme evolution in vitro have been developed in the protein engineering field. They allow engineering all kinds of enzymes in vitro so that new ones with novel functions and features can be obtained by the methods of error-prone PCR, DNA shuffling (exon shuffling), hybrid enzyme, random-priming in vitro recombination (RPR), stagger extension process (StEP), random-directed mutagenesis in vitro, etc., even with little knowlodge of spatial structure and catalytic mechanism of enzymes in advance. The process that would take millions of years in nature can in principle be accomplished in the test within several years.     

Women Images of South Literature——Brief Study of Rose for Emily

IntroductionWilliam Faulkner(1897-1962),a major figure ofcontemporary American literature,was representative of SouthLiterature in the United States.He wrote19long novels andmore than100short stories in his.He was famous for his longnovel named The Sound …     

The End of the American Dream——On the Tragedy of Gatsby

The Great Gatsby is considered as F.Scott Fitzgerald's most important book.This paper will concentrate on the symbolic meaning of Gatsby's tragedy-the end of the mythical American dream.Gatsby's personal experience approximates the whole of the American dream.This paper gives a detailed analysis on the formation of his dream,his great efforts in realizing his dream and his disillusionment.     

Challenge of new biological energy resources——Arguments on structure of active site of NiFe hydrogenase

Hydrogenases are enzymes that can reversibly split molecular hydrogen. Study on the structure of the active site and the mechanism of catalysis has drawn great attention because the results may be useful for the design of cheap biomimetic hydrogen catalysts for fuel cells, or as model for the photoproduction of H\-2. At one time the active site was generally considered to be composed of mononuclear nickel complex with ligands from the polypeptide. A breakthrough in the understanding of the structure of Hases occurred with the resolution crystal structure of D. gigas Hases in 1995. The unexpected result challenged the previously reported spectroscopic studies and caused some academic arguments. Some methods and results used for insight into Hases have to be reconsidered. Different viewpoints concerning the structure of active site of Hases in different periods and some remaining questions will be presented.     

A Gleam of Hope in Nothingness——The Interpretation of Waiting for Godot

Even though Samuel Beckett's works,Waiting for Godot,reflects the idea of absurdism that mainly describes the desolation and the spirit crisis of modern west after two world wars,he doesn't deprive us of all the hopes.In this article we are going to interpret roughly where the hope is embedded in four aspects.     

New Direction of Fashion Design——The Fashion Designing of Green Circulation Consumerism

Green circulation consumerism is the mainstream consumer attitudes in the 21st century,originally derived from green consumption.The costume designing of green circulation consumerism is also known as eco-clothing,green clothing.The designs should meet the health,safety andcomfort requirements;meanwhile it should fulfill sustainable development,resource conservation and other various requirements.     

Analysis of Voltaire＇s Candide—— from the Perspective of Gender Roles

This essay analyzes the famous French writer＇s novel Candide from the perspective of gender roles. It introduces some literary terms related to gender, and explains my understanding of the gender roles some characters have played from the aspects of wars and masculinity, Candide and masculinity, female characters and femininity, and Candide related to feminism.     

Allium alabasicum——A New Species of Allium

Allium alabasicum (D.S.Wen et Sh.Chen)Y.Z.Zhao,sp.nov.fig.1.——A.polyrhizum Turcz.ex Regelvar.alabasicum D.S.Wen et Sh.Chen,in sched.Species affinis A.mongolico Regel,sed planta pumila,circ.10cm alta;foliis filiformibus,perspicuelongioribus quam scapis;umbella laxa,pauciflora,saepe 4～5 flora;tepalis 3～3.5mm longis;filamentislongitudine tepala fere aequanribus;filamentis internis basi circ.1/4 dilatatis trianguli-ovatis;ovariis basinectariis operculatis concavis differt.Bulbus multus,spisse cespitosus,teres,tunicis exterioribus fuscis,in fibras dehiscentibus.Foliasemitertia vel teretia,filiformia,6～10cm longa,circ.0.3mm crasa,perspicue longiora quam scapi.