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以培养学生综合素质为指导思想,改验证性实验为设计性实验,改孤立实验为连续关联实验,旨在充分发挥学生的主观能动性,激发学习兴趣,培养学生的创新意识和综合实验能力. 相似文献
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研究了不同光周期对中华绒螯蟹雄性生殖的影响.实验分4组:实验1组为自然光照;实验2组为3 d自然光照,2 d完全遮光;实验3组为2 d自然光照,3 d完全遮光;实验4组为全程遮光.实验为期70 d.结果如下:各实验组60 d后性腺指数(GSI)出现显著差异,至实验结束时,实验1组最高,为94.0×10-4,实验4组最低,仅38.0×10-4.血淋巴睾酮含量30 d时各组即出现差异,至实验结束时睾酮含量以实验1组最高,为1.475 ng/mL,实验4组最低,仅0.305ng/mL.肝体指数(HSI)亦在30 d时出现差异,实验结束时以实验2组最高,为0.081,实验1组略低,为0.077,而实验3、4组分别为0.058和0.059.此外,至实验结束时不同光照时间组肝胰腺总脂含量也存在明显差异,各组总脂含量分别为:实验1组25.3%,实验2组26.5%,实验3组20.6%,实验4组19.1%.结果表明,光照时间不仅对雄性中华绒螯蟹生殖系统的发育、性激素的分泌有重要影响,还会影响肝胰腺对物质的积累,适量的光照时间为雄蟹发育所必需. 相似文献
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实验课程体系改革打破了原以二级学科设置相应教学实验的体系,改革为模块化的化学实验课程体系.为适应模块化的实验课程体系,以模块化的基本操作和技能培养为主线,对实验教材建设和实验内容亦进行了改革.对模块化实验课程体系下,如何兼顾各类非化学化工类专业的教学实验,及模块化实验课程体系与综合开放实验的关系进行了初步的探索. 相似文献
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从红外成像实验谈物理实验建设思想 总被引:2,自引:0,他引:2
物理实验建设思想是实验要面向学生,实验建设必须以学生为中心展开各项工作,要真正做到提高学生的实验积极性和实验创新意识。并以红外热成像仪实验的建设为例展开论述。 相似文献
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高中物理是一门以具体实验内容为核心,实验流程为依据的标准实验课程,无论是定律还是定理,都是由实验总结积累起来的实验技巧,所以要充分完善物理实验教学必须从学生的理解,教师的实验展示,教学过程中的综合考虑以及探索其实验奥秘为基础,师生共同完成的实验任务。 相似文献
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Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness. 相似文献
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Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women's language from these perspectives: pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women's language, more attention should be paid to language use in social context. What's more, the linguistic phenomena in a speaking community can be understood more thoroughly. 相似文献
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理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。 相似文献
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As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death. 相似文献
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Miao Maosheng 《华南师范大学学报(自然科学版)》2014,(6)
正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula- 相似文献
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Yang Weitao 《华南师范大学学报(自然科学版)》2014,46(6):137-138
We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re- 相似文献
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Bernard Kirtman 《华南师范大学学报(自然科学版)》2014,(6)
正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that 相似文献
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《上海师范大学学报(自然科学版)》2014,(5):550
<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with 相似文献
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《吉林大学学报(理学版)》2014,(5):1105
<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has 相似文献