再谈高校名称英译问题

我国高校译名在译法上长期处于“各自为政”的状态。本文从翻译的基本原则出发,对现今高校校名英译中的常见问题进行分析和研究,提出了相应的解决办法。文章指出,为了规范我国高校译名,国家教育管理部门应组织资深学者对所有高校译名进行一次彻底的治理整顿,使全国各高等院校的英文译名保持相对的准确性、统一性和稳定性。     

瓦楞纸箱结构设计尺寸压痕放缩量的一种算法

从瓦楞纸板压痕点向纸板内发生转移的原理出发,以不同楞型、不同厚度瓦楞纸包装为样品,分别对压痕点距纸板内边转移量的影响因素及FEFCO 0201纸箱结构设计尺寸压痕放缩量的计算方法进行研究,得出外尺寸、制造尺寸的计算公式,压痕外转移量的计算公式,FEFCO 0201纸箱结构设计尺寸压痕放缩量的算法。     

平面压痕的极限开裂角与临界载荷

当矩形平端刚性压头作用在无摩擦弹性基体的表面时, 在基体表面生成一个平面压痕, 同时在压痕边界处的近表面诱生奇异应力场, 该奇异应力场的奇异性与裂纹尖端I -型应力场的奇异性同价, 使平面压痕的表面产生断裂型开裂。利用能量释放率原理, 分析压痕边界断裂开裂的极限开裂角、极限开裂载荷等相关问题。     

柱壳周期阵列平齿取芯钻断裂型破岩机理

当二维刚性平端压头作用在弹性体的表面时,形成一个平面压痕,并在压痕的边界诱生出裂纹型的奇异应力场,该应力场将使弹性体的表面产生断裂型开裂。柱壳周期阵列平齿取芯钻作为典型的平面压痕模型在工程中的应用,利用平面压痕断裂力学模型,分析了该取芯钻的断裂型破岩机理。导出了柱壳周期阵列平面压痕I-型和II-型应力强度因子,给出了周期阵列压痕临界开裂角的上界与下界,以及临界破岩载荷的上界与下界,建立了取芯钻断裂型破岩行为的定量分析方法。     

多点成形中压痕的形成与控制方法

对多点成形中压痕缺陷的形成及影响因素进行了力学分析,指出弹性垫技术可以明显地消除压痕缺陷。采用多点压机及多道多点成形技术改变了约束方式及变形路径,因而有效地抑制了成形缺陷的产生,提高板材的成形极限并实现了大变形量成形。通过典型的数值模拟及成形实验说明了弹性垫技术及多道成形技术消除压痕缺陷的有效性。     

中口径自动舰炮输弹簧的疲劳寿命及损伤分析

本文研究了中口径自动舰炮输弹簧的疲劳寿命及损伤规律.研究指出,该弹簧断裂属高周疲劳破坏,以线弹性断裂力学为基础的寿命估算与实验结果吻合较好;研究得到弹簧疲劳寿命损伤曲线,并指出弹簧端环上的钢印压痕造成约70%的疲劳寿命损伤;研究认为,只要保证弹簧热处理质量,采用合理的喷丸工艺,并避免压痕,该弹簧可以满足服役性能要求.     

当代高校学生管理工作的时代挑战与对策

当今时代的发展,使传统的高校学生管理工作面临严峻的挑战.本文从分析新形势下学校外部环境、学生主体、学校及高等教育改革的现状出发,指出新形势下高校学生管理工作应树立以人为本的管理理念,积极探索适应时代要求的高校学生管理模式,改革和创新高校学生管理工作.     

圆柱壳周期阵列压痕应力强度因子

当柱壳平端刚性压头作用在同形的弹性基体表面时,在基体上生成一个平面压痕,同时在压痕边界处的近表面诱生奇异应力场,该奇异应力场的奇异性与裂纹尖端I-型应力场的奇异性同价,使平面压痕的表面产生断裂型开裂。利用当量裂纹法给出圆柱壳周期阵列压痕的应力强度因子。     

自动问答系统中问句分类研究综述

问句分类作为问答系统所要处理的第一步,在问答系统中起着至关重要的作用,其准确性直接影响最终抽取的答案的正确性。从问句分类的概念出发,先对问句分类体系、特征提取、问句分类方法等进行阐述,然后重点分析了用于问句分类的几个主流学习模型,并对几个模型作了比较分析,最后指出了当前问句分类的研究难点和未来的研究方向。     

基于纳米压痕分析的往复扭转载荷下45号钢的力学性能

通过自制的原位拉扭-压痕力学性能测试装置,开展了往复扭转后45号钢拉伸力学性能测试。首先,由纳米压痕试验分析并获得了往复扭转后45号钢的力学性能曲线及其弹性模量、硬度、屈服强度和应变硬化指数等参数的变化。然后,通过原位拉伸试验证实了纳米压痕试验计算45号钢力学性能的可行性。结果表明,拉伸试验和压痕试验计算获得的材料力学参数具有很好的一致性。本文通过原位图像,还进一步分析了材料在往复扭转载荷下的损伤机理,证实了试验结论的正确性,为通过纳米压痕试验获取服役状态下材料力学性能提供了试验依据。     

STUDY ON DETERMINING K_(Ic) OF CERAMIC MATERIALS BY INDENTATION MICROFRACTURE

In this paper,by studying the accuracy ofindentation microfrature,it is pointed out that the residualstress in the indentation site plays a critical role,whichmakes the theoretlcal analysis extremely difficult and theindentation microcracks slowly expaned,therefore,affectsthe accuracy of measurement.It is concluded that accordingto the microtstructure analysis it is not acceptable to estimatecompletely the accuracy of determining K_(?) by indentationmicrofracture from the point of view of classical fracturemechanics.     

A study of indentation scaling relationships of elastic-perfectly plastic solids with an inclusion near the conical indenter tip

Indentation hardness is found to be related to indentation depth when indentation test is applied on homogeneous materials under small indentation depth, which shows strong size effect in the indentation. While in contrast, indentation hardness has a very limited relationship with indentation depth when it is large, showing distinct scaling relationships between hardness and material properties. Previous studies on scaling relationships under deep indentation condition of elastic-perfectly plastic homogeneous materials have been carried out systematically by finite element analysis. In this paper, a heterogeneous material, particlereinforced matrix composite is detailed studied to investigate its scaling relationships under deep indentation with different particle positions and material properties by finite element analysis.     

Compressional Deformation in Indentation Process for Microlens Array Mold

The structure of a microlens array (MLA) can be formed on copper by an indentation process which is a new manufacture approach we applied here instead of a traditional method to test the material property,thereby work time can be saved.Single-indentation and multi-indentation are both conducted to generate a single dimple and dimples array,namely micro lens and MLA.Based on finite element simulation method,factors affecting the form accuracy,such as springback at the compressed area of one single dimple and compressional deformation at the adjacent area of dimples arrays,are determined,and the results are verified by experiments under the same conditions.Meanwhile,indenter compensation method is proposed to improve form accuracy of single dimple,and the relationship between pitch and compressional deformation is investigated by modelling seven sets of multi-indentations at different pitches to identify the critical pitch for the MLA's indentation processing.Loads and cross-sectional profiles are measured and analyzed to reveal the compressional deformation mechanism.Finally,it is found that MLA at pitches higher than 1.47 times of its diameter can be manufactured precisely by indentation using a compensated indenter.     

Compressional Deformation in Indentation Process for Microlens Array Mold

The structure of a microlens array (MLA) can be formed on copper by an indentation process which is a new manufacture approach we applied here instead of a traditional method to test the material property,thereby work time can be saved.Single-indentation and multi-indentation are both conducted to generate a single dimple and dimples array,namely micro lens and MLA.Based on finite element simulation method,factors affecting the form accuracy,such as springback at the compressed area of one single dimple and compressional deformation at the adjacent area of dimples arrays,are determined,and the results are verified by experiments under the same conditions.Meanwhile,indenter compensation method is proposed to improve form accuracy of single dimple,and the relationship between pitch and compressional deformation is investigated by modelling seven sets of multi-indentations at different pitches to identify the critical pitch for the MLA's indentation processing.Loads and cross-sectional profiles are measured and analyzed to reveal the compressional deformation mechanism.Finally,it is found that MLA at pitches higher than 1.47 times of its diameter can be manufactured precisely by indentation using a compensated indenter.     

用moire技术测量平板玻璃折射率

本文描述了使用moire技术测量平板玻璃折射率的理论并进行了实验论证。测量方法简单且快捷。可精确测量任何透明材料的折射率。测量精确度可达10~(-5)。     

一元线性回归分析法在建筑业预测工作中的应用

文章对一元线性回归方程式进行了数学推证,结合实例阐明了一元线性回归分析法在建筑业预测工作中的实用价值和应用技巧。同时,对用此法进行预测的精确性作了理论分析和验证,说明此法具有较强的实用性和较高的预测精度。     

Determination of Young''''s modulus by nanoindentation

Loadanddepthsensingindentationtechniqueisveryusefulinprobingthemechanicalpropertiesofmaterialsonsmallscales[1—5].Youngsmodulusisoneofthemostcommonlyconcernedmaterialpropertiesmeasuredbythiskindoftechnique.Conventionally,itisachievedonthebasisofthemethodproposedbyOliverandPharr[4]usingthewell-knownrelationship:whereSuistheinitialslopeofunloadingcurve,EristhereducedmodulusandrelatedwiththeYoungsmodulusEandPoissonsratioνoftheindentedmaterialandthose(Ei,ni)oftheindenterbytheequation1/Er=(1-n2…     

多层框架结构静力分析的精细元法

以高精度的齐次扩容精细积分法和矩阵分析理论为基础,提出了一种新型的分析框架结构静力问题的精细元法.该方法克服了有限单元法的精度依赖单元阶数的不足,同时突破了传递矩阵法在分析多层框架结构时存在的局限.文章以两层两跨框架为例,详细阐述了多层框架结构静力问题的精细元法求解步骤.对比算例表明本方法具有很高的精度和效率,可以达到计算机的满精度.     

热历史对CaO(MgO)-Al_2O_3-SiO_2系统晶化性能和硬度的影响

研究了热历史对一种CaO（MgO）－Al2O3－SiO2系统微晶玻璃的晶化性能和压痕硬度的影响。利用X射线衍射分析了微晶玻璃的晶相种类;结合光学显微镜观察,探讨了热处理温度对晶相体积百分数的影响;确定了硬度与测试荷载之间的关系。实验结果表明,随着热处理的提高,微晶玻璃的晶相含量增加,微晶玻璃的硬度增大     

撞击力—压入位移关系的弹性分析

本文用弹性动力学的一般方法对撞击力-压入位移关系问题进行了分析。在仅考虑纵波传播的情况下,寻出了撞击力-压入位移关系。并由此进一步证明了Hertz公式在动态问题应用的合理性。