核内夸克分布与轻核的核效应

在改进的核密度模型基础之上,利用束缚核子内夸克分布参数公式计算了深度非弹性散射中轻核的核效应函数,发现理论计算结果与实验符合得很好,检验了夸克分布参数公式的合理性．     

Thinking outside the (voice) box: A case study of students' perceptions of the relevance of anatomy to speech pathology

Speech pathology students readily identify the importance of a sound understanding of anatomical structures central to their intended profession. In contrast, they often do not recognize the relevance of a broader understanding of structure and function. This study aimed to explore students' perceptions of the relevance of anatomy to speech pathology. The effect of two learning activities on students' perceptions was also evaluated. First, a written assignment required students to illustrate the relevance of anatomy to speech pathology by using an example selected from one of the four alternative structures. The second approach was the introduction of brief “scenarios” with directed questions into the practical class. The effects of these activities were assessed via two surveys designed to evaluate students' perceptions of the relevance of anatomy before and during the course experience. A focus group was conducted to clarify and extend discussion of issues arising from the survey data. The results showed that the students perceived some course material as irrelevant to speech pathology. The importance of relevance to the students' “state” motivation was well supported by the data. Although the students believed that the learning activities helped their understanding of the relevance of anatomy, some structures were considered less relevant at the end of the course. It is likely that the perceived amount of content and surface approach to learning may have prevented students from “thinking outside the box” regarding which anatomical structures are relevant to the profession. Anat Sci Ed 2008. © 2008 American Association of Anatomists.     

复合动词的构成及语体色彩

复合动词在中古英语中并不多见,即使到18世纪,它的使用也相当狭隘。但从19-20世纪以来,复合动词的数量与日俱增,而且使用范围越来越广,受到语言学界的关注。本文通过对复合动词的深表层结构、构成方法、语体色彩的分析来说明复合动词的特点,为英语学习者全面了解、掌握应用现代英语中大量涌现的复合动词架设一座桥梁。     

再论与二次曲面有交线圆的平面

运用代数中的二次型理论对二次曲面的三个特征根满足λ1≥λ2≥λ3(λ2≠0)时，与它有交线圆的平面方程进行了研究，给出了求解与二次曲面有交线圆的平面的简捷方法。     

沿淮、淮北大豆种质资源主要农艺性状遗传参数分析

本文以我省沿淮、淮北地区65份大豆资源材料为试材,研究了该地区大豆种质资源的遗传变异特点,估计了主要农艺性状的群体平均数、遗传变异系数、遗传力、遗传进度、遣传相关及选择指数等遣传参数,明确了以生育后期、单株粒数、单株产量构成的选择指数对产量的选择效果最佳。提出了对该资源群体开发和利用的途径。     

基于有限元法的双衬层危险废物填埋场高压直流电渗漏检测

According to the structural characteristics of hazardous waste landfill,a new model based on the finite element method(FEM)is developed.The detection layer is considered as a sealed space and it is assumed that total current flows through the leak for the high resistivity of geomembrane liner.The leak current is regarded as a positive point current I and the other current source is-I.Electrical potential of an arbitrary point in detection layer satisfies Poisson equation. Experiments for detecting leaks in liner were carried out.Excellent agreement between experimental data and simulated model data validates the new model.Parametric curves for a single leak show that with optimum selection of field survey parameters leaks can be detected effectively.For multiple leaks,the simulated results indicate that they are detectable when leak separation is larger than measurement spacing.     

回转体(圆柱、圆锥)交贯线投影的参数化绘图

本文讨论了在AutoCAD 2 0 0 0平台上如何利用VLISP编程解决圆柱面与圆锥面相交之交贯线投影的参数化绘图问题 ,详细阐述了编程过程并给出了部分源程序代码     

基于CDS的4G移动通信实验教学系统构建

移动通信是通信工程专业与行业紧密结合的一门专业必修课,但多数高校面临“商用4G-学校2G”的尴尬局面。文章针对课程实验教学与现行4G网络结合较差的问题,基于LTE无线网络测试软件CDS和移动终端设计4G移动通信实验课程。该方案易实施、投入小,有助于学生深刻掌握LTE系统信令流程,培养网络数据采集与分析等工程能力,对高等院校实施工程教育以及4G实验室建设具有重要参考价值。     

激光加工中高斯光束的特性与传输变换

为了获得光束质量较好、光斑尺寸较小、功率密度较高的、适合激光加工的激光束,对激光加工中的高斯光束进行传输与变换.先对高斯光束的特性及其传输变换进行了理论分析,而后在实际中加以验证.结果表明,经过这种传输变换后可获得光斑直径较小的、功率密度较高的、可用于激光加工的激光束.说明这种传输变换是可行有效的.     

A perspective of microplasma oxidation （MPO） and vapor deposition coatings in surface engineering of aluminum alloys

IntroductionInrecentyears,improvingthewearlifeofAl-basedalloyscomponentsinheavysurfacecontactconditionsbytheapplicationofmicroplasmaoxidation(MPO)coatingshasprovensuccessfulundertechnicalandeconomicconsideration.MPOtechnologyhasrecentlybeentakenasarapid,novelandeffectivemeanstoprovidethickceramiccoatingswithexcellenthardnessandload-bearingcapacityforlightalloymaterials,particularlyaluminumalloys[1].TheMPO,alsocalledplasmaelectrolyticoxidation(PEO),isanadvancedtechnologyforroutineanodizing…