自旋极化输运的方法讨论

电子自旋注入和自旋相关输运是自旋电子学中被广泛研究的课题。本文将介绍在自旋电子学器件上具有广泛应用前景的不同结构中物理原理相关的材料问题,如F/I/S隧穿、F/I/F隧穿、Andreev反射。     

Located in the thin of it: Young children’s use of thin moral concepts

One important socio-cultural medium through which young children’s moral understanding is cultivated is parent/child discourse. Of particular interest to us was young children’s use of basic (‘thin’) evaluative concepts (good, bad, right and wrong), which are ubiquitous in everyday discourse and serve as a potential bridge from the non-moral to the moral domain. We investigated 14 2–5-year-old children’s (and their parents’) use of thin evaluative concepts and found that while they frequently used good and bad to morally evaluate other people’s and their own psychological/dispositional states and behaviors—as well as, less frequently, to highlight relevant standards, expectations and rules—they did not use right and wrong. In contrast, a sample of US written and spoken public conversation revealed that adults did. Reasons for this are discussed, along with the frequency of different types of moral evaluations, differences between children and their parents, and age-related trends.     

新型给水管材水力工况对比分析

通过对各种新型给水管材之间水力工况的比较和分析，推得各种管径的新型给水管材与相应公称直径的镀锌钢管单位长度水头损失的比值K，由于管材间水力工况的不同，在工程设计、旅工中更换管材时，不能简单地用相同或相近管径的管材互相替代，而应重新对系统进行水力计算。     

(Re)braiding to tell: using trenzas as a metaphorical–analytical tool in qualitative research

Metaphors can be used in qualitative research to illuminate the meanings of participant experiences and examine phenomena from insightful and creative perspectives. The purpose of this paper is to illustrate how I utilized trenzas (braids) as a metaphorical and analytical tool for understanding the experiences and perspectives of Latina teachers around being a well-educated person. Accordingly, this paper is organized into three strands. First, I discuss trenzas as a metaphorical concept in raced–gendered epistemology, highlighting the work of Chicana/Latina feminist scholars in law and education. Second, I describe how metaphorical thinking informed the methodological design. Third, I explain how I used trenzas to make sense of data and build theory. The discussion weaves the three strands together to emphasize the functional and generative nature of trenzas as a metaphorical–analytical tool for gaining critical and nuanced understandings of how personal, professional, and community identities shape participant’ experiences and perspectives.     

Sedimentation of a single particle between two parallel walls

INTRODUCTIONThecenteringofaparticlewhichsettlesatsmallReynoldsnumbershadbeenstudiedbyseveralresearchers.ChristophersonandDowson(1959)foundthattheoretically,whentheeffectofinertiaisnegligible ,aballachieveseccentricequilibriuninaverticaltubehavingadiameteronlyslightlyexceedingthediameteroftheball.Theyverifiedtheiranalysiswithexperiments.VaseurandCox (1977)didexperimentsonthesedimentationofasmallsphereinaverticalductofarectangularcross section .Theyobservedthatthespherealwaysmigratedtothec…     

垂直方位词“上／下”“UP／DOWN”隐喻研究

文章以汉语垂直性方位词“上/下”和英语垂直性方位词“UP／DOWN”作隐喻对比研究，解读汉、英在时间、状态、数量和地位这四个概念城内，从空间关系的选择和袁达形式到反映的认知模式上的相似性。     

用有限元法合理设计压力容器凸形封头

运用有限元法,考虑封头的结构、封头与简体的连接形式、开孔位置、接管与封头的连接结构等因素,对受内压的凸形封头(球形封头、椭圆形封头、碟形封头及锥形封头)进行了应力分析计算。     

基于PHP/MySQL的古汉语语料库系统的设计与实现

结合古汉语语料库系统数据结构的基本模型，根据系统的B／S模型的设计思路，分析了B／S结构和PHP技术特点，提出了古汉语语料库系统的一般模型，并用PHP＋MySQL技术实现了系统的主要功能。     

实验室质量体系ISO/IEC导则25:1990到17025:1999的转换

中国实验室国家认可制度全面实施了从ISO／IEC导则25：1990到ISO／IEC17025：1999的转换，本文结合实际的质量体系转换经验，分析了对于ISO／IEC17025：1999的特点的理解，给出了实验室质量要素和程序文件在不同标准中的对应和转换关系，并提供了质量体系建立和转换工作中的步骤和方法。本文可以为其他同类实验室完成质量体系的转换工作提供参考。     

高职“CAD／CAM”教学改革的探讨

根据高职数控技术及应用专业CAD／CAM课程的特点，结合我交几年来的教学改革，系统地介绍了该课程在课程体系，教学方法，实践教学等方面的改革措施及所取得的阶段性成果。