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将学到的知识用于实际是初中学生应具有的物理素质，而STS（科学、技术、社会）试题内容广泛，有利于考查学生的综合素质，在各类考试中所占比例越来越大．另外，由于这类问题与实际紧密结合，相当部分学生，都是感到无从下手，为拓宽学生的视野，提高解答这类问题的能力，本文对相关问题作分类例析． 相似文献
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Using φ-mapping method and topological current theory,the topological structure of disclination lines in 2-dimensional liquid crystals is studied.By introducing the strength density and the topological current of many disclination lines,it is pointed out that the disclination lines are determined by the singulaities of the director field,and topologically quantized by the Hopf indices and Brouwer degrees,Due to the equivalence in physics of the director fields n(x) and -n(x),the Hopf indices can be integers or half-integers,representing a generalization of our previous studies of integer Hopf indices. 相似文献
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加权移动平均法通常被用于趋势预测，主要是因为移动平均有修匀和平滑的功能。但移动平均同时也存在着滞后的缺点。本文尝试着将加权移动平均法加以改进，使其能够适用于高校的年度业绩考核。改进以后的加权移动平均模型，既保留了修匀和平滑的特性，又比较显著地消除了滞后的缺点。如果以此种方法统计出来的数据作为年度考核的依据，可以有效地避免被考核对象由于某一时期业绩的偶然波动而被误判的现象发生。 相似文献
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In light of the Ф-mapping method,the contribution of disclination linges to the free energy density of 2-dimensional liquid crystals is studied in the single-elastic constant approximation.It is pointed out that ,compared with the previous theory ,the free energy density can be divided into two parts.One is the usual distorted energy density of director field around the disclination lines.The other is the free endrgy density of the disclination lines themselves which is centralized at the disclination lines and topoligically quantized in a unit of 1/2kπ .The topological quantum numbers are determined by the Hopf indices and Brouwer degrees of the director field at the disclination lines,i.e.,the disclination strength.From the method of Lagrangian multipliers,the equilibrium equation and the molecular field of 2-dimensional liquid crystals are also obtained.It is shown that the physical meaning of the Lagrangian multiplier is just the distorted energy density. 相似文献
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In the light of Ф-mapping method and the relationship between entropy and the Euler characteristic, the intrinsic topological structure of entropy of Kerr black holes is studied. From the Ganss-Bonnet-Chem theorem, it is shown that the entropy of Kerr black hole is determined by singularities of the Killing vector field of spacetime. These singularities naturally carry topological numbers, Hopf indices and Brouwer degrees, which can also be viewed as topological quantization of entropy of Kerr black holes. Specific results S = A/4 for non-extreme Kerr black holes and S = 0 for extreme ones are calculated independently by using the above-mentioned methods. 相似文献
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正目前环境保护已成为全人类共同关注的问题。在所有学科中与环保关系最紧密的当属化学,学习化学的目的之一,就是要用化学知识进行环境保护与治理。新的课程标准明确指出:"在化学教学中,通过帮助学生了解化学制品对人类健康的影响,懂得运用化学知识和方法去治理环境,合理地开发和利 相似文献
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杨国宏 《中国高校师资研究》2007,(1):44-48
上海大学在长期的中青年教师培养与选拔工作过程中，逐步树立了坚持以内涵建设为主题，坚持以学科和学术团队建设为主线，坚持以国际交流与合作为平台，坚持以培养高层次人才为重点，坚持以服务管理为保障的“五个坚持”的指导思想，并制定了相应的培养政策与措施，取得了显著的培养效果． 相似文献
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本文从大力加强人才引进和培养、严格教师准入制度,合理配置师资队伍、进一步深化和完善教师岗位聘任制等方面,介绍了上海大学近年来的探索和实践。通过这些探索和实践,进一步明确了目标、落实了措施,使得建设高水平师资队伍有了新进展;进一步深化和完善了教师岗位聘任制度,使得广大教师积极性的发挥有了新亮点;进一步构建了创新学科平台,使得师资队伍的优化配置有了新突破。 相似文献
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