α-淀粉酶活性对不对称重力大小与方向的依赖性     

袁龙飞  刘荣  周影  肖亚婷  何裕建 《中国科学院大学学报》2016,33(3):354-359

手性有左右之分.对于重力,可人为产生左、右手螺旋力.通过光谱学手段,考察不对称重力大小及方向变化对α-淀粉酶活性的影响.结果表明,在1~9 000 g范围内,超重力的增加能够逐渐提高α-淀粉酶活性,并且右手螺旋力比左手螺旋力对于α-淀粉酶活性具有更强的激活作用.考虑到地球天然重力昼夜周期性变化的事实和酶活性对重力大小与方向的依赖性,重力24 h的周期变化可能是昼夜生理节律产生的重要力学原因之一.  相似文献   

平面Bézier曲线细分算法的参数优化     

马晓辉  林凤鸣  申立勇 《中国科学院大学学报》2016,33(3):311-316

复杂曲线逼近是CAGD中的基本问题,传统deCasteljau算法通常固定细分参数为0.5.本文考虑平面Bézier曲线的凸包最小和扁平度最小两种情况,分别给出凸包最优和扁平度最优的细分参数的定义和计算方法,使每次细分后得到的新控制多边形更好地逼近原曲线.通过分析不同类型曲线的最优参数发现,对于较小的曲线段,细分参数选为0.5具有一定的合理性.比较扁平最小方法与deCasteljau定参数方法发现:对于形状复杂的曲线,前者细分效率提高50%以上;对于简单曲线,二者相当.  相似文献   

Spatial Planning and its Need for National and Regional Bibliographies of Grey Literature     

Christian Erlinger 《Cataloging & classification quarterly》2019,57(1):59-72

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Bandung in Latin America: the hope for another world     

Roberto Bissio 《Inter-Asia Cultural Studies》2016,17(1):19-26

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三原方言同音字汇     

孙立新 《咸阳师范专科学校学报》2014,(1):32-41

三原方言是中原官话关中片的一个地点方言。本文在实地调查和复查的基础上，对三原方言的声韵调和同音字汇进行了研究和梳理。  相似文献   

The Destructive Effect of Lawlessness on Man’s Soul     

余天敏 《海外英语》2014,(10):216-217,223

This paper analyzes the destructive effect of lawlessness on Dorian Gray in The Picture of Dorian Gray and Kurtz in Heart of Darkness.Under the protection of his portrait,Dorian Gray is lost in his seeking for pleasure and corrupts from a good angel into a vicious devil.As an oppressor in Africa,Kurtz can make his law and can do anything without punishment and is thus destroyed by his insatiable desire for ivory.The corruption of Dorian Gray and Kurtz shows that without observation,man may expose his evil side to an extreme.  相似文献   

表现主义论争：起因、内容及其思考     

张宪军 《海外英语》2015,(6)

表现主义作为德国现代主义文艺思潮，在美术、文学、电影、音乐和建筑等领域都取得了明显的成就，但在表现主义文艺思潮沉寂之后的1937—1938年间的关于这场文艺运动的论争再次将人们的视线引向表现主义，这场论争有一定的偏向性，但论争本身也使人们加深了对表现主义的理解，该文拟对这场论证的缘起和内容进行说明，并指出这场论争的意义。  相似文献   

基于建构主义的英美文学研究性教学探究     

李文良  马晓颖 《唐山学院学报》2011,24(5):109-110

针对英美文学的教学现状及问题,探讨了建构主义理论指导下英美文学研究性教学的改革与实践,并对改革实践效果做出了初步的总结与分析。  相似文献   

比较文学教学的四个关键词     

吴家荣 《安徽教育学院学报》2011,29(1):116-118

比较文学作为一门学科,内容丰富、学理性强。如何使学生真正了解比较文学学科的价值、意义,使他们正确运用比较文学原理、方法,深入开展文学研究,四个关键词至关重要,即：比较;影响;可比性;变异性。学生只有充分了解关键词的含义,切实掌握了关键词的运用,比较文学的教学才能收到事半功倍的成效。  相似文献   

Exploring elementary students’ perceptions of disabilities using children's literature     

Julia Wilkins  Kathryn Howe  Maddie Seiloff  Shelly Rowan  Elizabeth Lilly 《British Journal of Special Education》2016,43(3):233-249

The portrayal of characters in children's literature can be a very powerful influence on young children. Teachers have a responsibility to expose children to characters of all types, including those with disabilities. The goal of this study was to explore how third and fourth grade students responded to characters with disabilities in children's books. We read a total of 12 books that included characters with disabilities to students in two third‐grade and one fourth‐grade class at three elementary schools. We video‐recorded discussions about the books and identified the following four themes, all of which related to influences on students’ responses to the character with a disability: (a) societal messages, (b) academic responses, (c) teacher influence and (d) portrayal of disability. We recommend that teachers carefully select books featuring characters with disabilities based on the way the disability is portrayed in the book, and, after the read‐aloud, use questioning strategies that encourage students to make thoughtful, deep comments rather than giving ‘expected’ responses.  相似文献