UGII在CAD/CAM技术课程实验教学中的应用     

秦春节  孙小权 《实验室研究与探索》2005,24(8):56-57

实验是获取知识、培养创新思维和实践能力的重要渠道。本文强调了UGII在CAD／CAM技术课程实验教学中的作用，并主要介绍UGII在CAD／CAM各单元技术与集成技术的典型应用。  相似文献   

双呋喃甲醛Schiff碱金属铜(Ⅱ)配合物为载体的高选择性硫氰酸根离子电极     

吴庆  孙志勇  柴雅琴  袁若 《遵义师范学院学报》2005,7(3):46-49

报道了二醋酸双(呋喃甲醛)缩邻苯二胺铜(Ⅱ)为载体的PVC膜电极.该电极对硫氰酸根离子(SCN-)具有高的电位选择性和灵敏度,并呈现反Hofmeister选择性行为.采用交流阻抗技术和紫外可见光谱技术初步研究了电极的响应机理,结果表明配合物中心金属原子的结构以及载体本身的结构与电极的响应行为之间有非常密切的构效关系.将制得的电极初步应用于实际废水样品分析,结果与HPLC法一致.  相似文献   

[Cu（DPA）μ-NO3]n·3nH2O（DPA=2,2＇-联吡啶胺）的晶体结构和非等温热分解动力学的研究     

王辉  周映霞  申小清  张鸿云  杨睿  吴庆安  侯红卫  朱玉 《安阳师范学院学报》2006,(5):67-71

本文对配合物[Cu(DPA)μ-NO3]n·3nH2O(1)(DPA=2,2'-联吡啶胺)合成、结构和光谱性能进行了描述.(1)属于单斜晶系,P21/c空间群.中心金属离子CuII处于扭曲的四方锥的配位环境中:一个DPA上的两个N原子和一个NO3-的两个O原子位于四方锥底部平面,轴向位置由另一NO3-的O原子占据.每一个NO3-的两个氧原子与CuII鳌合,且另一氧原子与相邻的CuII配位形成一维Z型链结构.链与链之间靠分子间的相互作用力在bc面形成二维结构.此外,我们运用TG-DTG热分析技术结合红外光谱对其热分解行为和热稳定性进行了探讨,并对其热分解反应进行了非等温动力学计算,得到了相应的动力学参数.  相似文献   

Nazi Dentists on Trial: On the Political Complicity of a Long-Neglected Professional Community     

《Endeavour》2020,44(1-2):100710

Studies on the complicity of the medical profession in the crimes of the Third Reich are on the rise. This also applies to the question of the extent to which doctors were brought to justice in international trials after World War II. This topic, however, has hardly been considered—let alone systematically investigated—with respect to German dentists. It is precisely this gap that this article will address. First, we quantitatively identify all dentists who were brought to justice in the post-war period. Second, we give a profile of this group. We focus on the following questions: Who among the group was brought to trial, and when? What crimes were they accused of, which sentences were handed down, and how did these sentences affect their future lives? Our study is based primarily on archival sources, which we analyzed with respect to the relevant secondary literature. Contrary to the widely-held assumption that dentists had almost never had been made to stand trial after the end of the war, we identified 48 dentists who were accused in court. The prototypical accused dentist was male, lived in a traditional family model, belonged to the National Socialist Workers’ Party (NSDAP) and the Waffen-SS (Schutzstaffel), and was part of the so-called Kriegsjugendgeneration. The most frequent allegations made against these men were the theft of dental gold of murdered Nazi victims, an accusation unique to dentists; (accessory to) murder or manslaughter; and involvement in the deadly selections made in the concentration camps. In total, eight dentists were executed. Generally speaking, the earlier these proceedings and the sentencing took place, the harsher the sentence was. Many of those who received prison sentences subsequently found their way back into the dental profession.  相似文献   

广西资源县晓锦遗址第二期出土古稻研究     

向安强  张文绪  何安益  傅珍  黄超 《科学与管理》2014,(5):67-71

用欧氏距离比较、粒型判别函数等方法,对广西资源晓锦遗址第二期出土的154粒完整炭化稻米,经过复原为新鲜稻谷后,通过综合分析认为:晓锦二期古稻属于倾粳稻类型的栽培古稻群。在判别函数和距离测定数据指标上都属于粳稻类型。在形态上最近于粳稻,与普通野稻最远,表明己是栽培稻。该群古稻与参照系差别较大,粒型大而重。  相似文献   

The influence of pollutants on accelerated ageing of parchment with iron gall inks     

《Journal of Cultural Heritage》2014,15(4):373-381

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信息管理研究现状的可视化分析     

杨瑞仙  周江南 《情报探索》2014,(3):1-5

以ISI Web of Science收录的以“information management”为主题的文献作为研究对象,利用CiteSpaceⅡ工具,对信息管理研究文献进行可视化研究,包括时间分布、地区分布、作者机构分布、期刊分布、学科分布、学科代表人物及其作品,展现信息管理的研究热点和研究前沿,揭示信息管理研究的现状,为我国信息管理的发展提供参考.  相似文献   

从凡尔赛-华盛顿体系的内在矛盾看二战起源     

赖凡 《涪陵师范学院学报》2008,24(6)

第二次世界大战爆发的一个突出特点是它离第一次世界大战的结束只有20年,它的爆发与一战结局必然有着深刻联系,而一战的结局则直接体现为凡尔赛-华盛顿体系,因此,谈二战起源就不能不从凡尔赛-华盛顿体系说起。凡尔赛-华盛顿体系的内在矛盾是新的大战爆发之根本原因。  相似文献   

Extending Lotkaian informetrics     

Quentin L. Burrell 《Information processing & management》2008

The continuous version of the Lotka distribution, more generally referred to outside of informetrics as the Pareto distribution, has long enjoyed a central position in the theoretical development of informetrics despite several reported drawbacks in modelling empirical data distributions, most particularly that the inverse power form seems mainly to be evident only in the upper tails. We give a number of published examples graphically illustrating this shortcoming. In seeking to overcome this, we here draw attention to an intuitively reasonable generalization of the Pareto distribution, namely the Pareto type II distribution, of which we consider two versions. We describe its basic properties and some statistical features together with concentration aspects and argue that, at least in qualitative terms, it is better able to describe many observed informetric phenomena over the full range of the distribution. Suggestions for further investigations, including truncated and time-dependent versions, are also given.  相似文献   

The World War II crisis innovation model: What was it,and where does it apply?     

《Research Policy》2023,52(9):104845

World War II was one of the most acute emergencies in U.S. history, and the first where mobilizing science and technology was a major part of the government response. The U.S. Office of Scientific Research and Development (OSRD) led a far-ranging research effort to develop technologies and medical treatments that not only helped win the war, but also transformed civilian life. Scholars and policymakers have appealed to the wartime approach as a template for other problems, typically focusing on the Manhattan Project, but overlooking the broader OSRD effort of which atomic fission and dozens of other programs were a part. In this paper we bring OSRD into focus, describe how it worked, and explore what insights its experience offers today. We argue that several aspects of OSRD continue to be relevant, especially in crises, while also cautioning on the limits to generalizing from World War II to other settings.  相似文献