As an up-and-coming star rising gradually after World War II, American playwrighthas drawn critics’ attention since he first got his fame in 1944. is one of his most famous and most popular plays, which wins the Pulitzer Prize for Drama, the Donaldson Awards and the New York Drama Critics’ Circle Awards, the first work ever to win all three. Under the basis of the script, this dissertation focuses on Williams’ writing process, analyzing from the script to the stage the artistic features of .This dissertation begins from current studies on Williams and his masterpiece A Streetcar Named Desire. After summing up predecessors’ studies, chapter one points out that drama and script are two completely different concepts and the dramatic form of drama cannot be neglected, but should be taken into full consideration by the playwright while writing. Chapter two examines the script under the theory of Reader’s Reception, and concludes that A Streetcar Named Desire is by all means a fascinating script. Chapter three explores from the perspective of symbolism. Different from the traditional realistic writing techniques, Williams makes use of symbols audaciously in his realistic play. These symbols not only bring vigor to the script but help the heroine Blanche to appear vividly as the inbreaking, the escapee and the raped. Exempting from the tedious explanation, Williams employs succinct symbolic language and concise symbolic movement, however, endows the script with plenty connotation, and also exhibits marvelous stage effects it will bring. Chapter four evaluates the script with an eye to stage light, music and sound. Williams’ brilliant use of these subsidiary theatrical devices adds color to the psyche of the characters and arises similar emotions in readers as well.
Between Script and Stage-An Analysis of the Art of a Streetcar Named Desire (Education Papers posted on April 19th, 2015 )
Study on Land-Use Change and Its Driving Forces in Horqin Sand Land (Education Papers posted on April 19th, 2015 )
In this paper,the study area is the Da Liushu forest farm in the Naiman county of Inner Mongolia Tongliao City in South-central in.This research area using RS and GIS technology and based on the basis of information of TM / ETM + remote sensing data of 1992,1997,2002,2007 four-year phase.It is combined to the kind of field investigation and relevant statistical data,and through the qualitative and quantitative analysis,this paper is studied the land use and vegetation types for the dynamic monitoring of research;its revealed the land use and vegetation types of the dynamic change trend,and discussed the s about the land use and vegetation types.So that it’s provided the theoretical basis of ecology to the ecological environment in the region and restoration of vegetation.The main conclusions are as follows:1.Based on the TWINSPAN classification and DCA ordination,and effectively integrated into the image plaque about the area＜500m2,arise the following types of land-use:1) Agg.Pennisetum centrasiaticum- annual herbage 2) Ass.A. Halodendron- annual grasses association 3)Artemisia halodendron+Salix gordejevil+Lespedeza hedysaroides- annual grasses association 4)Artemisia halodendron-Artemisia scoparia+perennia 5) lakes.6) Cultivated Land.7) woodland.8) Residential Points.9) exposed sand.10) Saline land.11) Wetland Vegetation 12)Rivers 13)others2.The change of land-use and its dynamic features in the study area indicated that:1) At different times of comprehensive dynamic degree of land use were 5.94 （1992-1997）,6.24（1997-2002）,6.71（2002-2007）,and its indicates that the extent of land-use change increased with time;2) Structural changes in land-use were indicated that:The land-use types into the phenomenon of cultivated land with varying degrees,areas of cultivated land was 4999.32 hm2 in 1992,and it reached 19655.42 hm2 in 2007.The areas of Residential Points were increased from 1963.78 hm2 in 1992 to 3278.60hm2 in 2007.Areas of other types were decreased.3) The change ratio of land- use R was bigger than zero,which indicated that land use was in developing period.3.Driving factor in research area can be summarized as natural geography factor and socioeconomic factor.There were significant correlation between Cultivated Land areas and socioeconomic factor.Through Regression Analysis,the Imitate the Linear Relationship between Cultivated Land areas and socioeconomic dynamic factor about Demographic factors,level of development and people’s living standards.Regression equation established by the principal Component Analysis between cultivated land areas and dynamic factors as follows: y=0.075X1+0.061X2+1.0785E-06X3+9.8031E-06X4+2.111E-05X5+1.346E-06X6+ 2.619E-06X7+3.331E-05X8+3.910E-06X9+2.265E-06X10+4.460E-06X11-0.168X12-1.8586 The above-mentioned studies have shown that in the years 1992-2007,the socio- factors is an important dynamic factors about changes area of cultivated land areas,and the role of natural factors are not obvious.
Research on Monitoring System of Planting Quality for Drill (Education Papers posted on April 19th, 2015 )
Coversation tillage is called a world’srevolution , and new technique in agriculture mechanization which department mainly generalize. It haves remarkable benefit of economy ,society and zoology, such as keeping entropy and enhancing soil fertility , reducing erode of water and wind , restraining sand dust devil , decreasing working procedure , depressing task cost and increasing farmer’s income and so on . At present, the core that conversation tillage technique is popularized and applied is . Bring forward higher demand for realizing no-tillage of dry land agriculture in the north owing to particularity of conversation tillage such as the earth’s surface covered straw and stubble of underground, etc. So, stand or fall of performance is determinant of realizing no-tillage seeding , while one of the important measure of achieving no-tillage seeding is using monitor system to detect work of ,in addition to ensure performance and quality of machine. Using of no-tillage planter exist in difference because different area have distinction of themselves in geography condition and entironment . In order to ensuring seeding quality , equip the monitoring system for 2BMFS-5/10 type no-tillage mulch fertilizing planter .It aims to monitor caused by in seed tube or furrow opener and avoids this phenomenon. Thus ,using infrared LED as detection element, and adopting transistor and operation amplifier etc. integrate circuit to form detection circuit, which divides a signal into two components-the impulse that indicates normal seeding, and the background direct current, then amplifies them respectively with different amplification coefficients, finally merges them into one signal to analyze. This method can increase the contrast between the impulse and the direct current, meanwhile it works well in high-dust circumstance . During the process of seeding, alarm will be given once there is the phenomenon of a missing seed or , so that work efficiency and planting quality is greatly improved . The tests indicate that this monitor system can commendably accomplish the detection of work condition of seeding tube, meanwhile be the same with wheat and corn .And it haves steady work state, high monitoring precision , especially works well in high-dust circumstance and rather perfect ratio of performance and price.
Analyzing the Policy of Russia Intervene to Syria Crisis (Education Papers posted on April 19th, 2015 )
As the “” kept blowing, it has brought down so many regimes inNorth Africa and Middle East, such as Yemen’s Saleh, Egypt’s Mubarak, Libya’sGaddafi and also Tunisia’s Ben Ali. From2011march, the tide spread to Syria, led tomassive demonstrations and violations. International and regional powers andnon-state actors quickly involved in , tried to reach different strategicpurposes, while their common enemy is the Assad regime. At the very moment,everyone thought the Assad regime would fall down as soon as possible and Assad’sfamilies would be brought to trial. To the contrary, two years has been passed, whatall we see is the Assad regime still there. Thinking about the reasons, in addition tothe complicated ethnic and religious compositions in Syria, the parties insulated toform a resultant force, and Iran’s important supports become the key pillar forthe regime’s survival. and Syria has a long friendly relationship between eachother. In history, has always been Syria’s greatest foreign supporter ininternational community, the two sides had a very good cooperation in manyinternational and regional issues. For this reason Russia is unwilling to see Syriasliding into mess. From the very beginning, Russia has advocated that Syrians should:reform, dialogue, and stop violence. And then Russia resist pressures to refuse thewestern and regional powers’s calls for Assad’s fall, regime change, foreigninterference with UN’s authorize. Because of Russia’s firm stance, the Assad regimecan survive until now.This article will have a deeply analysis of Russia’s policy to Syria crisis. Thefirst part will discuss the causes why Russians pay so high attention to Syria issue;The next fiction will have a detailed elaboration of its policy; The third section willsum up the characteristics of Russia’s diplomacy reflected by Russia’s position onSyria problem; The last portion will discuss the results of Russia’s policy on thistopic.
Palladium-Catalyzed Cross-Coupling Reactions in Aqueous Media (Education Papers posted on April 19th, 2015 )
-catalyzed s are the important methods for the selective construction of the carbon-carbon bonds. However, many of these transformations were conducted in harmful organic solvents. As a result, the development of some benign palladium-catalyzed cross-coupling processes is becoming a very urgent project for chemist. In this dissertation, we have developed two green modified protocols for the palladium-catalyzed s based on solvent and catalyst.1. PEG-400 [poly （ethylene glycol-400）] was found to improve the Pd（OAc）2/DABCO-catalyzed aqueous Suzuki-Miyaura and Stille cross-coupling reactions. In the presence of Pd（OAc）2, DABCO and PEG-400, a variety of aryl halides were coupled with arylboronic acids or organotin compounds efficiently to afford the corresponding cross-coupled products in moderate to excellent yields. The turnover numbers was up to 900,000 for the Suzuki-Miyaura reaction and up to 9800 for the Stille reaction. The catalyst system was also effective for Heck and Sonogashira cross-coupling reactions to some extent.2. Polymer-supported DABCO-palladium complex was observed as an efficient and reusable catalytic system for the Suzuki-Miyaura、Stille and Hiyama cross-coupling reaction. In the presence of 0.25 mol% of the polymer-supported DABCO-palladium complex, a variety of aryl bromides were coupled with arylboronic acids efficiently in an aqueous ethanol at room temperature under air. Moreover, the reaction was very rapid, and the catalyst could be recovered and reused at least five times from the reaction by simple filtration. It was also found that the Stille, Hiyama reactions in aqueous solvent and vinyl halides, aryl chlorides coupled with arylboronic acids in DMF could be carried out efficiently to afford the cross-coupled products in moderate to excellent yields.
A Research of Adaptive Equalizer in Digital Microwave Transmission System (Education Papers posted on April 19th, 2015 )
Forsystems exist at this stage due to the ISI channel attenuation problem, this thesis through the study of adaptive equalizer, the decision feedback equalizer and fractionally spaced equalizer to improve the structure design of a That the interval of sampling points with a decision feedback equalizer interval, the channel for distortion compensation. And analyzing and comparing the advantages and disadvantages of various adaptive algorithms, the constant modulus algorithm (CMA) do not need to send a training sequence, save spectrum resources, improve channel utilization, while CMA low computational complexity, the actual self-To adapt to the application of more and more balanced. However, the inherent shortcomings of constant modulus algorithm is slow convergence, step size selection in relatively small when the need for tens of thousands of iterations to gradually converge. Therefore, for lack of CMA algorithm, we use the correlation between the input signal vector of the characteristics of the CMA algorithm is improved, improved CMA algorithm is essentially a solution related to the adaptive algorithm, while the improved algorithm based on the input signal Feature to adjust the algorithm step size, it has a faster convergence rate, and have a good future in the convergence of the tracking performance.To a new fractionally spaced decision feedback equalizer structure, combined with the improved CMA algorithm, after the simulation, the improved communication system to join CMA fractionally spaced decision feedback equalizer, the signal reduction capability and convergence speed have a very Greatly improved.Finally, the characteristics of digital microwave system, using Simulink for system and structure simulation, in this based on the introduction of different equalizer, concentrate on the different channels the performance of several equalizers, through the bit error rate And SNR performance of the simulation analysis, and further verify the new CMA equalizer in system superiority.
Synthesis and Characterization of Functionalized Coating Material SXFA for SAW (Education Papers posted on April 19th, 2015 )
A surface acoustic wave (SAW)is a kind of vapor sensor which has been utilized to detect and monitor toxic or hazardous gases such as chemical weapon agents or in real-time. Reversible sorption can happen between sensing film on SAW sensor and the analyte. Some characters of SAW sensor such as spreading speed between different phases will be changed for the sorption. In result of the aforementioned changes, a corresponding alteration will happen to the frequency, so the quantitative analysis can be carried out.Adsorbent material Poly(methyl(4-hydroxy-4,4-bis(trifluoromethyl)but-1- yl)siloxane)(SXFA) was synthesized by reaction of polyallylmethylsiloxane and (HFA). Because of hydroxyl on the substitute group on polyallylmethylsiloxane, SXFA exhibit hydrogen-bond acidity. Some traditional , such as DNT, TNT, have hydrogen-bond basicity. It is possible that SXFA can be utilized to detecting these warfare .Polyallylmethylsiloxane with different molecular weights is synthesized by anionic ring-opening polymerization, characterized by infrared spectrum and GPC in this paper. The SXFA was synthesized from Polyallylmethylsiloxane and hexafluoroaceton (HFA) and characterized by infrared spectrum, ion chromatograph and hydroxyl analysis. The polymer was coated on the piezocrystal by two methods of solvent evaporation and spin coating. In the gas supply system, , (DNT) was used as simulation gas, and the responses of SAW sensor were tested at DNT concentration of 750mg/m3.Polyallylmethylsiloxane with narrow molecular mass distribution was obtained by adding different amounts of initiator. In the synthesis of SXFA, the influences of reaction time, solvent, reaction temperature and are investigated. By the result of Characterization, best process conditions were selected. In the adsorption test, the influences of solution strength and coating methods on response are discussed.
Organic light emitting display and lighting device has its own outst… (Education Papers posted on April 19th, 2015 )
Organic light emitting display and lighting device has its own outstanding advantages, including low power, high performance, and small size. The emphasis in the light elemitting device is life, and it depends largely on the spectral stability. Hindrance materials have morphological stability and thermal stability, and then decide on the material has good spectral stability. In this paper, we design molecular based on the concept of sterically hindered, and synthesis new electroluminescent phosphor host material and bluematerials.Spiro[fluorine-9,9-xanthene]（SFX） as the core, we successful introduce diphenylphosphate functional groups in position 2, position 2,7, position 2’and position 2′,7′. The triplet energy level is 2.78eV, 2.70eV, 2.86eV and 3.83eV, respectively. They are suitable for blue PhOLED and green PhOLED as a host. Compared with SFX, the LUMO of them is lower 0.790.85eV. The TGA test of them show high thermal stability, and the decompose temperature （Td, 5%） of the double replaced compounds is 90°C higher than that of single replaced compounds. It achieves the maximum external quantum efficiency of 10.9% in blue phosphorescent devices, and the maximum external quantum efficiency of green light devices to 19.8% in green phosphorescent devices.Blue light as matrix, we introduce hindered amine functional groups in position 9 of fluorene. We have successfully synthesis five polymers by homopolymerisation or copolymerization for different ratio, including P1, P2, P3, P4 and P5. GPC test show number-average molecular weight is 45471, 70816, 77522, 22867 and 71290, respectively. The TGA tests of them show high thermal stability, and the Td reach 400°C. Compared the green index (IGreen, 527nm/IBlue, 450nm) in thermal annealing experiment, homopolymer P4 shows slow climbing in green index and the best performance.
Analysis and Implementation of On-Chip Transformer for RF ICs (Education Papers posted on April 19th, 2015 )
The wireless communication revolution has accelerated the development of fully integrated CMOS transceiver. Following the Moor’s Law, the voltage of the System on Chip (Soc) has been decreased, which has spawned a revival of interest in the design and optimization of.On-chip transformer can couple the signal into the next stage without decreasing voltage swing and introduce the feed back with good noise performance. Furthermore it is the building block in QVCO.Recently the has been used wider and wider in RF front-end circuits. Lacking of a general and accurate model is the barrier in RF IC design. It is inadequate to model the transformer by the analysis of on-chip spiral inductor.In this paper, a novel model has been presented. By analyzing the electromagnetic field, those important parasitic capacitances which improve the reliability and accuracy are described in this model. This model can also offer the engineer an intuition in design and optimization of transformer with the standard CMOS process.Adopting TSMC 0.25μm Mixed signal CMOS process, various transformers with different parameters have been implemented to prove the accuracy and reliability of the model presented in this paper.Furthermore, a low voltage supply (LNA) with the feedback introduced by transformer has been implemented by the art-of-state process (TSMC 0.25μm Mixed signal CMOS process). This LNA is achieved low noise performance with low voltage supply.
Photo-promoted Carbonylation of Olefins with Methyl Formate under Ambient Conditions (Education Papers posted on April 19th, 2015 )
Carbonylation is one of the most important organic synthesis which usually takes place at high temperatures and high pressure with precious catalysts. In recent years, more and more attention has been paid to the photo-promoted carbonylation under ambient conditions.It is well known that carbon monoxide gas is the most commonly employed C1 source in the carbonylation. However, the use of carbon monoxide gas is limited due to high toxicity and complicated operation. The recent attention has been paid to the researches of using C1 source in liquid or solid state in place of CO gas.In this paper, the photo-promoted carbonylation ofs with methyl formate catalyzed by non-precious metal catalysts has been studied under ambient conditions.The cobalt complexes catalysts show high catalytic activities for the photo-promoted carbonylation of s. Weak basicity is beneficial to this reaction and NaOAc is the most efficient additive. In addiation, NaI also can promote the reaction. The results indicate that the reaction activities of s increase with the increasing temperature under the catalysis of cobalt complexes. However, as for the carbonylation of straight chain terminal olefins, the ratio of n/i is not good as we expected.On the basis of the carbonylation with cobalt complexes catalysts, are investigated. The catalytic activities of are lower than cobalt complexes but the selectivity of ester for straight chain terminal olefins is high, the major product is isomeric ester. Base additives have no promoted effects on this reaction. On the other hand, halides have different promoted effects on different olefins. The activities of cyclohexene and 1-octene can be improved by additition of NaI and NaBr, respectively.The mechanism of methyl formate participating in the carbonylation is verified by the IR analysis and the labeling experiments of CD)3OD and CH318OH. The results indicate that methyl formate decomposes into CO and CH3OH firstly under irradiation, and then the carbonylation of olefins proceed.The influences of some factors on the photo-promoted carbonylation of olefins are studied. The results are obtained that double bond with groups of donating electrons are beneficial to this reaction and double bond with groups of withdrawing electrons are unfavorable to this reaction. The space configuration of olefins also have some effects on the reaction, the activitiy of terminal olefin is better than branched olefin. The activity sequence of the alcohols is as follows: primary alcohol, secondary alcohol and tertiary alcohol. As for primary alcohol, the activity decreases with the increasing length of carbon chain.The mechanism of photopromoted carbonylation of olefin with carbon monoxide catalyzed by Co（OAc）2 is investigated by UV and IR spectrograph. It is preliminary considered that Co2（CO）8 maybe is not the intermediate as some literature reported, Co（OAc）2 is assumed to initiate the reaction via another catalytic cycle.