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1.
LIU Min GAO Hong-liang 《美中教育评论》2009,6(4):62-66
Since the beginning of Chinese higher education expansion in 1999, higher education in terms of scale, speed and structure has been rapid development and beyond the bearing capacity of its ecological balance, input and output of the unbalanced phenomenon between higher education and social environment, the unbalanced phenomenon also appear in regional distribution, between quantity and quality, between structure and function. The status quo of Chinese higher education has been described in the paper, the unbalanced phenomenon has been analyzed, and the corresponding countermeasures has been proposed for the imbalance in Chinese higher education, it provide reference views for the reform of Chinese higher education. 相似文献
2.
1IntroductionQuantumtransport in mesoscopic systems has beenextensively investigated in the past two decade[1].Since Wees ,et al.[2]and Wharam,et al.[3]discov-ered the phenomenon of conductance quantization ofan electron through a narrow two-di mensional con-striction,there have been a number of other works ,which are concentrated on studying electron scatteringfrom i mpurities in a narrow quantum conductorwire[4-10].Bagwell and Avishai ,et al.[4-6]have exam-ined the influences of scattering … 相似文献
3.
程友良 《上海大学学报(英文版)》1999,3(1):84-86
The study of solitary waves has been a subject highly popular and full of interest sinec Russell[1]first observed the solitary waves in a channel and the research on the internal solitary waves in stratified fluids is one of the branches of this subject.There are extensively internal solitary waves in the atmosphere,oceans.fjords and lakes.To study them is of academic and practical significance[2].Numerous investigators have made contributions since the theoretical work on internal solitary waves was initiated by Keulegan[3].Nevertheless,some problems remain still to be discussed,for example,the higher-order theories for one-dimensional internal solitary waves in stratified fluids of small depth,the two-dimensional internal solitary waves,the explanation of the experimental and the practical phenomena by means of theoretical analysis.In this thesis,we hope to gain an insight into the above three items by combining of theoretical analysis and symbolic computation.The following work has been completed. 相似文献
4.
As a linguistic phenomenon, euphemism exists in all kinds of languages, so it is widely used by various circles of society. It is not only a linguistic phenomenon, but also a kind of social phenomenon, which is a reflection of the social culture in the language. Euphemism has already penetrated into all aspects of daily life, and reflected different national psychologies and cultural differences. As the development of the society and human civilization and the accelerated process of economic globalization, the role euphemism plays in human communication especially in cross-cultural communication has been increasingly prominent. Here a comparative study on English and Chinese euphemisms is made to help to be familiar with similarities and differences of the use of euphemism in English and Chinese languages so as to reduce errors resulting in cross- culture communication, and improve cross-cultural communicative competence. 相似文献
5.
1 Introduction Since the finite element method was proposed ,there has been plenty of work about it (see [1 -4]) .They deeply analyzed and studied the finite elementmethod and gave us the feasibility of it on the theoryside . On the practice side ,the finite element methodhas successfully solved various problems ,especiallyinphysical and engineering fields[5 ,6]. Variational inequalities appear in a variety of nonlin-ear physical models .In particular ,variational inequali-ties have been used… 相似文献
6.
In SLA, the learners’ language as interlanguage has been widely recognized and discussed among teachers and linguists.Various models have been established to explain the phenomenon of errors in second language learning including the Variability Theory in question. This paper makes an attempt to review the Variability Theory and its distinct attitude and solution to the socalled errors. 相似文献
7.
As is known to all in the translation field,the problem of translatability and untranslatability has been a long-debated is sue in the field of translation.And the phenomenon of untranslatability is especially prominent in translation of literary works.This paper tries to discuss,from theory and practice,the phenomenon of untranslatability and its compensation strategies in trans lation between Chinese and English.It is roughly divided into two parts,wherein the first part deals with the phenomenon of un translatability,explaining its causes and giving some examples,and the second part deals with the compensation strategies,intro ducing several methods of compensation and taking The Original of Laura written by the deceased Russian-American writer Nabokov as an example.With the development of intercultural communication in the world and the great efforts of translators,the untranslatable words today can be translatable tomorrow. 相似文献
8.
邱贤德 《重庆大学学报(英文版)》2003,2(1)
1. Introduction In order to study rock damage and fragmentation during blasting, many numerical models have been developed. These efforts have varied from semi-empirical [1,2] to formulations based on shock wave physics [3,4]. Numerical modeling of blasting has been focusing on the complexity of the blasting process. This complexity requires that numerical models be developed in a highly systematic fashion in close coordination with controlled field and laboratory experimentation. This work d… 相似文献
9.
1. Since always refers to a continuing period of time from a point in the past until the present. Eg. Ever since you were born you have been troublesome [you are still troublesome]. The company has been successful since the new Managing Director was appointed [it is still successful]. He has been smoking heavily since he was a teenager [he is still smoking heavily]. Don't use since for periods which ended in the past. Don't say: Since 1990 right up to the end of 2000 he was living in Australia. We began the preject since 1998. He has been smoking heavily since he was a teenager until he was forty. 相似文献
10.
阴可 《重庆大学学报(英文版)》2003,2(2)
1. Introduction Rock mass is composed of rock blocks and various kinds of structural planes. Most structural planes are joints defined as cracks or fractures in rock along which there has been little or no displacement [1]. Under different engineering condition, the mechanical behavior of rock mass is different. In excavation of slope and cave, most region of the rock mass is unloaded. Especially in a high steep slope or a large underground project, the larger the excavation and the dimension… 相似文献
11.
不可压各向异性超弹性材料中的空穴生成 总被引：3，自引：0，他引：3
The cavitation problem in a solid sphere composed of an incompressible anisotropic hyper-elastic material under a univroms radial tensile dead load was examined.A new analytical solution was obtained.The stress contruibutions were given and the jumping and concentration of stresses were discussed.The stability of solutions and the effect of the degree of ainsotropy of the material were analyzed. 相似文献
12.
宋玉娥 《北京工业职业技术学院学报》2008,7(4):6-10
研究了各向同性不可压超弹性材料球体在表面均匀拉伸死载荷作用下的空穴分岔问题,得到了描述球体内部的空穴生成和增长的空穴分岔方程,证明了空穴分岔方程的平凡解支上存在唯一的分岔点,并给出了分岔的辨别条件;利用奇点理论给出了空穴分岔方程在分岔点的等价正规形,并利用最小势能原理讨论了空穴分岔方程的稳定性。 相似文献
13.
根据汽机甩负荷造成给水泵汽蚀的原因及危害 ,从计算除氧器暂态过程中给水泵入口汽蚀余量的最大降落值入手 ,分析防止给水泵汽蚀的条件 ,提出预防措施。 相似文献
14.
《天津大学学报(英文版)》2020,(4)
The eff ect of Zn interlayer on the microstructural evolution and mechanical behavior of dissimilar ultrasonic-spot-welded Al/Cu joints was investigated. The tensile lap shear strength in relation to welding energy was analyzed. The experimental results show that two intermetallic compounds, Cu_5Zn_8 and Al_2Cu, were generated at the interface of the ultrasonic-spotwelded Al/Cu joint with a Zn interlayer. The primary joining mechanisms of the joint included the intermetallic compound bonding and metallic bonding caused by solid shear plastic deformation. Meanwhile, with increasing welding energy, the plastic deformation of the material became more substantial. With increasing welding energy, the tensile lap shear strength of the joints fi rst increased and then decreased for the ultrasonic-spot-welded Al/Cu joints with and without Zn interlayers. Under the energy input of 700 J, the bearing load capacity of the ultrasonic-spot-welded Al/Cu joints with a Zn interlayer improved signifi cantly due to the observed intermetallic compound(Cu_5Zn_8). 相似文献
15.
根据薄壳非线性动力学理论和拟壳法的思想,给出了扁球面网壳在动、静荷载协同作用下的非线性动力学控制方程.然后利用扁球面网壳的非线性动力学变分方程和协调方程,在夹紧固定的边界条件下,通过Galerkin作用得到一个含二次和三次的非线性动力学微分方程.用Floquet指数方法研究了系统的分岔问题,讨论了平衡点（奇点）邻域的稳定性问题.指出了系统在纯动态作用和在动静荷载协同作用下其平衡位置的变化情况. 相似文献
16.
金属材料拉伸缺口变形行为的研究 总被引：1，自引：0，他引：1
通过拉伸试验研究了在"缺口效应"影响下塑性金属材料试样不同截面处的塑性变形规律及其它常规力学性能指标,结果表明所试验金属材料缺口拉伸塑性变形主要集中发生在缺口附近局部区域,同时探讨了增加"缺口塑性"这一新的性能指标及建立相关试验标准的必要性。 相似文献
17.
LUO Zhan-you ZHU Xiang-rong GONG Xiao-nan 《浙江大学学报(A卷英文版)》2007,8(9):1380-1387
An expansion theory of spherical cavities in strain-softening materials with different moduli of tension and com-pression was presented. For geomaterials,two controlling parameters were introduced to take into account the different moduli and strain-softening properties. By means of elastic theory with different moduli and stress-softening models,general solutions cal-culating Tresca and Mohr-Coulomb materials' stress and displacement fields of expansion of spherical cavity were derived. The effects caused by different elastic moduli in tensile and compression and strain-softening rates on stress and displacement fields and development of plastic zone of expansion of cavity were analyzed. The results show that the ultimate expansion pressure,stress and displacement fields and development of plastic zone vary with the different elastic moduli and strain-softening prop-erties. If classical elastic theory is adopted and strain-softening properties are neglected,rather large errors may be the result. 相似文献
18.
为研究预应力混凝土连续箱梁桥的承载能力及实际工作状况,通过实际桥梁的静载试验,测得桥梁在各个工况下控制截面的应变、挠度随荷载增加能保持良好的线性关系,并判断实测残余变形与实测总变形比值小于0.2,同时采用桥梁专用有限元计算分析软件MIDAS/Civil建立试验跨模型,与静载试验实测数据进行对比分析,得到桥梁的应变校验系数和挠度校验系数,综合判断桥梁的承载能力能满足要求。 相似文献
19.
The deformation behavior of hot isostatic pressing (HIP) FGH96 superalloy was characterized in the temperature range of 1 000-1 100℃and strain rate range of 0.001-0.1s-1 using hot compression testing. The flow curves of HIP FGH96 superalloy during hot deformation was analyzed systematically. The results show that deformation temperature, strain rate and strain are the main influence factors on flow stress of HIP FGH96 superalloy during hot deformation. The flow stress displays a peak at a critical strain and then decreases with further increase in strain. For a given strain, the flow stress decreases with the increase of deformation temperature, and increases with the increase of strain rate. A mathematical model of these flow curves was established through regression analysis and taking the strain as a modification factor. The calculated stress values agree well with the experimental values. 相似文献
20.
冷轧深冲钢(即IF钢)的成形性能是其冲压加工时保证零件质量最重要的因素。通过静态拉伸、织构分析、成形极限等试验方法,分别研究了IF钢的基本成形性能和模拟成形性能。试验结果表明:IF钢具有优异的力学性能、高的延伸率、高的应变硬化指数、高的塑性应变比以及低的平面各向异性度。此外,IF钢的成形极限较高,深冲及复杂变形时有较高的安全裕度。 相似文献