Preparation and characterization of ZnSe/CdSe core-shell microspheres

The preparation of Zn Se/Cd Se core-shell structure nanocomposites by using the re-prepared Zn Se microspheres as the template under the hydrothermal condition was presented. The influence of different mole ratios of ZnS e to Cd（NO3）2 on the morphology and structure of the final product was investigated. And the performances of ZnS e/Cd Se core-shell structure nanocomposites were characterized by the means of X-ray diffraction（XRD） analyses, scanning electron microscopy（SEM）, transmission electron microscopy（TEM） and photoluminescence（PL） spectroscopy. The results indicate that the core-shell structure product can be prepared, when the mole ratio of Zn Se to Cd（NO3）2 is larger than 1：1; and the product will be ball solid structure, when the mole ratio of Zn Se to Cd（NO3）2 is equal to 1：1. The photo luminescence results show that Zn Se/Cd Se core-shell structures have high photo luminescence emission properties, and the product with mole ratio of Zn Se to Cd（NO3）2 being 1：0.5 has the best luminescence properties.

METH1在酵母双杂交系统中的表达及对报告基因激活作用的检测

目的通过观察血管生成抑制因子METH1的cDNA片段在酵母双杂交中的表达及检测其对报告基因有无激活作用,为进一步明确METH1抑制增生性瘢痕的分子机制奠定基础。方法采用酵母双杂交Gal4系统3,经PCR扩增子METH1的cDNA片段,分别克隆入pUC19质粒,经测序正确后,再分别亚克隆入酵母双杂交诱饵载体pGBKT7中。将重组质粒导入酵母菌AH109,检测其表达产物在酵母细胞中对报告基因的激活作用。结果成功获得METH1的cDNA片段,该片段所表达的蛋白对酵母菌AH109无毒性,且对报告基因无激活作用。结论血管生成抑制因子METH1蛋白活性区在酵母双杂交系统中的表达产物,可作为诱饵蛋白进行相互作用蛋白的筛选研究。

METH1基因截短体的构建及其对HUVEC细胞增殖的影响

目的筛选血管生成抑制因子METH1功能编码区基因片段,为进一步研究METH1抑制增生性瘢痕的分子机制奠定基础。方法设计METH1三种基因截短体,分别构建相应的重组pcDNA3.1真核表达载体,然后将其稳定转染入HUVEC细胞,用RT-PCR、Western-Blot方法检测其在细胞中的表达,最后,通过MTT及FCM法验证其对HUVEC细胞增殖的影响。结果获得了能稳定表达的三种截短体,其中METH1-T2同METH1一样具有明显抑制HUVEC细胞增殖的作用,而METH1-T1、METH1-T3抑制细胞增殖的效果不明显。结论所获METH1-T2为功能活性区片段,可以替代METH1全长进行抑制增生性瘢痕的分子机制研究。

熔盐法生长Ca_4GdO(BO_3)_3单晶

Ca 4GdO(BO 3) 3 (GdCOB) single crystal is a new nonlinear optical crystal whi ch was discovere d in recent years.It has a large effective nonlinear optical coefficient,a high damage threshold,good chemical and physical properties and insensitivity to moi sture.Its moderate birefringence is favorable for phase matching.These propertie s make it possible to obtain frequency doubling laser of 1.064μm.By doping,it may be a excellent self frequency doubling crystal.Transparent single crystals GdCOB as needle were grown by the flux method. Chemical compounds Gd 2O 3,CaCO 3,B 2O 3 and H 3BO 3 were used as starti ng materials.By many experiments,with different ratio,it is proper to mix the st arting materials according to the reaction Gd 2O 3+8CaCO 3+6H 3BO 3=2 Ca 4 G dO(BO 3) 3+8CO 2+9H 2O.PbO was used as the main flux ,adding moderate PbF 2 , and B 2O 3.B 2O 3 also can be used as initial compounds and it is also a goo d solvent,but at high temperature,it has heavy viscousness.The crystals grown fr om B 2O 3 commonly has inclusion,so we used H 3BO 3 instead of B 2O 3.At t he same time,we considered that at high temperature H 3BO 3 will be decomposed and evaporated,which would make the initial composition change.When proper B 2 O 3 was added,it not noly can be used as solvent,but also can stabilize solvent component.The melt was contained in a platinum crucible.After holding the melt 1200℃ for 24h,it was cooled at a rate of 0.5℃ per hour.Single crystals GdCOB were obtained.With microscope,we observed the crystals have defects such as inc lusion and bubbles,which are related to rapid cooling,imperfect melt transport a nd unstable temperature.

Synthesis of Fullerene by Pyrolysis of Acetylenein Thermal HF-Plasma

Carbon soot containing fullerene was continuously produced in volume by pyrolyzing acetylene in thermal HF-Plasma. The characteristics of the carbon soot and C60 were analyzed by thtransmission electron microscopy, UV/visible, IR and Raman spectroscopy. The results show that the main ingredients of the carbon soot with size of about 25 nm are amorphous carbon, graphite and fullerene. The fullerene yield in carbon soot is about 2.5 g·h^-1. Compared with the graphite arc discharge method, the acetylene thermal plasma method is a preferential one for synthesis of fullerene.

SQUARE WAVE COHERENT METHOD FOR EXTRACTING IP EFFECT

ＳＱＵＡＲＥＷＡＶＥＣＯＨＥＲＥＮＴＭＥＴＨＯＤＦＯＲＥＸＴＲＡＣＴＩＮＧＩＰＥＦＦＥＣＴ￥Ｈｅ，Ｊｉｓｈａｎ；Ｗａｎｇ，Ｓｈａｏｗｕ；ＴａｎｇＪｉｎｇｔｉａｎ（ＣｅｎｔｒａｌＳｏｕｔｈＵｎｉｖｅｒｃｉｔｙｏｆＴｅｃｈｎｏｌｏｇｙ，Ｃｈａｎｇｓｈａ，...

甲基苯丙胺通过L型钙通道致皮层神经元病理性蛋白APP及p-Tau过表达

目的:探讨甲基苯丙胺(methamphetamine,METH)暴露引起的阿尔兹海默病(Alzheimer’s disease,AD)样改变,阐述L型钙通道在该病理样改变中的作用。方法:借助原代培养的神经元,利用Western blot法,观察METH(0、30、100、300、1 000μmol/L)暴露后引起AD样病理性蛋白淀粉样蛋白前体(amyloid precursor protein,APP)、磷酸化Tau蛋白(p-Tau)的表达,并观察钙通道抑制剂硝苯地平作用后APP、p-Tau表达的改变。结果:APP和p-Tau的表达随METH作用浓度和时间的增加而增高,具有剂量和时间依赖性。钙通道抑制剂硝苯地平(nifedipine,NIF)预先孵育后,METH引起的AD样改变明显改善。结论:METH暴露可引起AD病理性改变,L型钙通道抑制剂可部分逆转上述改变,因而L型钙通道可能作为对METH作用的干预靶点,具有潜在的干预价值。

A Brief Study on Culture Shock over Overseas Students and the Solution to New Cultural Environments

Culture shock is one of the common experiences by students and people abroad. They may experience the feeling of anxiety, disorientation, confusion, and even hostility because of misunderstanding to each other."Culture shock"refers to the phenomenon in which people engage in the interaction feel depressed, discomfortable, etc. Culture shock may be caused by the conflict of various value systems when students and people enter a new culture and other value system. Culture shock is also a consequence of the influence of the negative life event. The changes in one's life and lack of support from family members,friends will make them more vulnerable and cause great discomfort in the new environment.

Fiscal Expenditure and Income Gap between Urban and Rural Residents: An Empirical Study Based on Malmquist Index and Spatial Econometrics

Based on the analysis methods of non-parametric Malmquist index and spatial econometrics as well as the provincial panel data in 2007-2010, this paper estimates the efficiency of fiscal expenditure from local governments in china in terms of reducing the income gap between urban and rural residents for the first time and evaluates the spatial correlation and heterogeneity of this efficiency. The results have shown that the fiscal expenditure of most provinces is of low efficiency in reducing the income gap between urban and rural residents, and the expenditure efficiency of local governments is not relevant to their levels of economic development. Besides, the efficiency on reducing the urban-rural income gap between different regions of China has a tendency of convergence. But this is mainly reflected inside the regional economic belt. There is significant difference between the efficiency of each economic belt. The central region has the highest efficiency in a rising trend, the western region has the lowest efficiency in a downward trend, while the eastern region is relatively stable.

ADAPTIVE DELAUNAY TRIANGULATION WITH MULTIDIMENSIONAL DISSIPATION SCHEME FOR HIGH-SPEED COMPRESSIBLE FLOW ANALYSIS

Adaptive Delaunay triangulation is combined with the cell-centered upwinding algorithm to analyze inviscid high-speed compressible flow problems. The multidimensional dissipation scheme was developed and included in the upwinding algorithm for unstructured triangular meshes to improve the computed shock wave resolution. The solution accuracy is further improved by coupling an error estimation procedure to a remeshing algorithm that generates small elements in regions with large change of solution gradients, and at the same time, larger elements in other regions. The proposed scheme is further extended to achieve higher-order spatial and temporal solution accuracy. Efficiency of the combined procedure is evaluated by analyzing supersonic shocks and shock propagation behaviors for both the steady and unsteady high-speed compressible flows.

The Counting Problem of an Order N-group of Set

In this paper, we discuss the counting prob lem of an order n-group of set (A 1,A 2,…,A n) which satisfies ∪ni=1A i=｛a 1,a 2,…,a m｝ and one of the following: (1) ∩ni=1A i=Φ; (2) ∩ni=1A i=｛b 1,b 2,…,b k｝;(3) ∩ni=1A 1｛b 1,b 2,…,b k｝; (4) A i≠Φ (i=1,2,…,k). We solve these problems by element analytical meth od.

POLYMERIZATION OF(METH)ACRYLATES WITH ALUMINUM-BASED INITIATORS

A simple and effective way to prepare poly（acrylate）s, such as poly（methacrylate）, poly（butyl acrylate） and poly（butyl methacrylate）, has been achieved by using the single component aluminum-based compounds, such as modified methylaluminoxane （MMAO）, triisobutylaluminium （TIBA） and triethylaluminium （TEA） as initiators. Effective initiations and high molecular weight polymers with unimodal molecular weight distributions could be easily obtained by varying the reaction parameters of systems under mild conditions. Although these aluminum compounds were inefficient initiators for methyl methacrylate （MMA） polymerization, they exhibited remarkable catalytic activity for butyl methacrylate （BMA） polymerization, affording high molecular weight poly（BMA）s.

ON THE PARTIALLY CAVITATING FLOW AROUND TWO-DIMENSIONAL HYDROFOILS

The steady partially cavitating flow around two-dimensional hydrofoils war simulated numerically by the low-order potential-based boundary integration method. The cavity shape and length are determined for given cavitating numbers in the course of iteration by satisfying the kinematic and dynamic boundary conditions. The re-entrant jet model and the pressure-recovery close model are adopted to replace the high turbulent and two-phase wake forming behind the cavity. The results are compared with the other published numerical ones.

Helix-Sense-Selective Polymerization of N,N-Diphenyl (Meth)acrylamide by Anionic Catalysts

In this paper, the helix-sense-selective polymerization of N,N-diphenyl acrylamide (DPAA) and N,N-diphenyl methacrylamide(DPMAA) were studied with living helix prepolymer as anionic initiator, and the chiral optical properties of the obtained polymers were investigated too. It was shown that optically active polymers of DPAA and DPMAA could be obtained under the experimental condition, and exhibited the same screw sense as that of the prepolymer.

Novel boundary element method for resolving plate bending problems

This paper discusses the application of the boundary contour method fo r resolving plate bending problems. The exploitation of the integrand divergence free property of the plate bending boundary integral equation based on the Kirc hhoff hypothesis and a very useful application of Stokes' Theorem are presented to convert surface integrals on boundary elements to the computation of bending potential functions on the discretized boundary points,even for curved surface elements of arbitrary shape. Singularity and treatment of the discontinued corne r point are not needed at all. The evaluation of the physics variant at internal points is also shown in this article. Numerical results are presented for some plate bending problems and compared against analytical and previous solutions.

Prophet Muhammad (pbuh) Practices to Establish a Pluralistic Society: Study of Madīnah Charter in Contemporary Global Context

This study explores the practices of the Holy Prophet Muhammad ■ to establish a peaceful and diverse society with special reference to Methāq-e-Madīnah and its significance and application in contemporary socio-political context. Theoretically, the effort and dream to establish a peaceful and diverse society have been a matter of concern for the humanity from the ancient times. But it has become the most significant and burning issue of the contemporary global scenario. Ultimately, the human intellectual and physical development is based upon peace and peaceful coexistence. Therefore, a number of religious and socio-political scholars have been tried to establish a peaceful and diverse society in different phases of the human history. Practically, the Prophet Muhammad (■ )has made a unique and distinct contribution towards developing a peaceful and diverse society for 1,400 years ago, though he led or had been the part of multiethnic society of different faiths in the state of Madīnah. In order to establish a peaceful and pleasant relationship between Muslims and other communities of Madīnah, an agreement was signed which was titled Methāq-e-Madīnah. The Charter of Madīnah contained certain principles and regulations that are mandatory for a peaceful living in a diverse state or society. This charter is an excellent model for peace, prosperity, religious freedom, and human rights in the human history. According to this charter, all groups were free to exercise their religious beliefs and social and economic interests. According to this agreement, Madīnah was declared a federal capital of the state. This agreement had provided equal rights, religious autonomy, and socio-cultural freedom to all other groups of the Madīnah (Jews, Christians, and polytheists). Therefore, it is perceived that the Charter of Madīnah may become a preamble for peaceful coexistence in this multicultural and multipath world of the contemporary era. In this study, analytical research methodology has been adopted with qualitative approach.

Motivation——One of the Affective Factors and its Effect

Affective factors play a positive role in English study and motivation is the most important.Higher motivation predicts better second language acquisition.The types of motivation are mainly divided into two:extrinsic motivation and intrinsic motivation.Teachers should study their students as well as the teaching materials and then select scientific methods and make good use of them to reinforce their students'motivation.

Exploration of Teaching Methods in English Reading Lessons

With the increasing of globalization on social life and economic activities,English has already become one of the basic and essential accomplishments for citizens all over the world.English education,in five-year higher vocational education,not only need adapt to the requirements of social and economic development,giving service in order to cultivate high-quality and high-skilled talents,but also should consider students' mental and emotional attitude as well as other factors,thereby meeting their stainable needs in employment and life after graduated.Therefore,the English education of five-year higher vocational education possesses multiply social and cultural significance.Though the analysis and understanding of the course objectives,ideas,contents and implementation suggestions brought up by The English Curriculum Standards of the Five-year Higher Vocational Education in Jiangsu Province,this paper explores the educational methods of higher vocational English reading lessons.

On Applying Internet-based Teaching in College Oral English Teaching

Spoken language is such an important part in learning English that College English Curriculum Requirement considers promoting the students' spoken language as one of the most important goals in teaching English.However,at present,the students' oral expression competence is not so good in colleges.It is urgent to improve the quality of oral English classes and solve mute English of the students in colleges.Internet-based teaching is the new teaching mode adapting to the trend of the times.Internet provides excellent interactive methods for inquiry learning mode and provides the possibility for constructing an open learning environment.

Synthesis, Investigation and Use Aqueous Acrylic Dispersions

Emulsive polymerization of mono- and dy(meth)acrylates of butandiol, decid(meth)acrylate, methyl-α-alkilacrylates with industrial acrylic monomers—butylacrylate, methylacrylate, methacrylic acid, methyl(meth)acrylate has been investigated. Structurization of copolymers using dy(meth)acrylates of butandiol, braking of emulsive polymerization using water insoluble biocides, dy(meth)acrylates of butandiol and methyl-α-alkilacrylates have been determined. The mechanism of emulsive polymerization of (meth)acrylic monomers using methyl-α-alkilacrylates has been investigated.