太阳轮刚度对行星机构浮动量影响规律的研究

目的:以某2K-H型行星齿轮机构为研究对象,建立行星齿轮机构的力学模型并推导其运动微分方程.方法:参照该行星齿轮机构给定的基本参数,研究太阳轮支撑刚度对行星轮系中心件的浮动量的影响.结果:通过数值仿真计算发现太阳轮支撑刚度对太阳轮浮动量有显著影响.太阳轮的的浮动量会随着太阳轮支撑刚度的减小会明显增大.结论:对2K-H型行星齿轮机构的动态优化设计.     

中国针茅属分类、分布和生态的初步研究

 24 species and 4 varietes of genus Stipa L. of China have been studied and des- cribed in this paper.  It has been noted that  these  different  species  have various geographical distributions, depending on the changes of climatic and edaphic factors of their environments.  Based on the study of floral morphology together with ecolo- gical and distributional factors, the genus have been divided into 5 sections: 1.  Sect. Regelia Tzvel. 2. Sect. Leiostipa Dum. 3. Sect. Barbatae Junge 4. Sect. Stipa 5. Sect. Smirnovia Tzvel.       It should be pointed out that the section Regelia as well as two members of sec- tion Barbatae, S. purpurea and S. roborowskyi, belong to frigori-xerophilous ecotype, distributing over Qinghai-Xizang Plateau above the forest line.  The section Leiostipa belongs to euxerophilous and mesoxerophilous ecotype, distributing widely in north- west, southwest, northeast and east and extends to the forest-steppe vegetational Zone of China.  The section Smirnovia and other two members  of section Barbatae,  S. breviflora and S. orientalis, belong to euxerophilous ecotype, with the latitudinal dis- tribution as far as Nei-Mongo and the yellow soil plateau, with the altitudinal distribu- tion as far as the desert steppe of Sinkang and Qinghai-Xizang plateau.  The section Stipa belongs to euxerophilous ecotype, only distributes to the  mountain steppe  of north Xingkang and the last, section Barbatae is an artificial group having plumes overof the awn only, and its four species have already been mentioned above.     

论高校校园文化育人功能的实效性途径

校园文化建设作为高校大学生教育的有效载体,是高校全面育人不可或缺的重要环节,其＂软约束性＂的教育引导功能日益凸显,研究、分析校园文化育人所面临的新问题、新情况,构建与时俱进、满足师生需求文化育人的实效性途径。这不仅具有理论的探讨意义,更具有现实的实践意义。     

Collaborative Reasoning: Expanding Ways for Children to Talk and Think in School

This article presents a framework to help teachers facilitate small group discussions about stories children read. Collaborative reasoning discussions are intended to create a forum for children to listen to one another think out loud as they learn to engage in reasoned argumentation. Children use personal experiences and evidence from the stories to support their conclusions and consider each other's points of view. Excerpts from an ongoing study of 12 fourth-grade classrooms in rural, urban, and suburban settings are used to illustrate four characteristics of cognitive reasoning: (1) children's response to text; (2) children's use of text to consider multiple possibilities; (3) children's use of tools for persuading others; and (4) children's control of topic and turn-taking.     

Schlieren Visualization of Marangoni Effect in Gas-Liquid Systems

This paper is focused on the Marangoni effect in the gas-liquid mass transfer systems. A series of experiments were conducted to observe Marangoni effect by a laser Schlieren system. Experimental investigations of the occurrence of Marangoni convection were presented. The typical polygonal patterns and even the reaching of chaotic interfacial flow were observed. The visual evidences were discussed and the characteristic time and scale of Marangoni convection were obtained approximately as 0.5 s and 1 mm according to the Schlieren images. From the perspective of hydrodynamic instability, the mechanism of the Marangoni convection was investigated. Though many external factors have influence on the interfacial instability, the local surface-tension gradient is the primary reason for the Marangoni convection. The small-scale interfacial flow increases the surface renewal rate. Consequently, due to the occurrence of the Marangoni effect, the mass transfer rate can be significantly enhanced.     

高职动漫制作与设计专业素描教学方法初探

素描基础作为动漫制作与设计专业的一门必修专业基础课程,是培养该专业学生造型能力、观察能力、形象思维和创造思维的一个重要环节。高职动漫制作与设计专业的素描基础课程的教学,应充分结合多元化因素,处理好传统全因素素描、现代结构素描、创意素描教学的关系。     

福建省及其省会1961-2010年高温天气统计分析

利用1961-2010年福建省67个气象观测站的最高气温资料,研究了福建省酷热日和福州高温日的分布特征．研究结果表明：福建省的酷热天气主要出现在7月中下旬和8月上旬,出现酷热日数大于10天的大都集中在福建省中部．福州的高温日大多集中在7、8月份,且呈明显增长的趋势．     

生态信息知识化孵化模型与实现路径

基于信息生态学理论概括生态信息的内涵,在此基础上,通过与信息特征的对比阐述生态信息的特点。以仿生学孵化理论为依托论述生态信息孵化机理,总结信息、生态信息、知识的关系以及了解生态信息知识化的目的及意义,并利用协同理论、突变理论构建生态信息知识化孵化模型,借网格技术为支撑探究生态信息知识化的实现路径。     

电视生产者：权力解构与认同建构

生产者的内部结构组成影响了电视节目的生产方式、内容和特征;生产者的权力是来自国家制度、社会传统等力量与电视功能所建立的关系,经过关系转化,世俗力量变成电视生产者的象征性权力;在内部结构和外部权力的合力之下,电视节目体现了电视参与社会建构的具体形态。     

博士生独立研究能力的形塑过程及养成策略——基于情境领导理论的模型建构与分析

独立研究能力作为博士生应具备的关键能力之一,尚未得到足够重视和有效培养。基于情境领导理论,从任务难度设置、导生关系状态和博士生自身的科研能力水平三个维度构建了导师指导行为与博士生独立研究能力养成的交互分析框架,并由此形成了指示型、劝导型、参与型和赋权型等四种博士生指导方式的理想类型。博士生独立研究能力的养成是一个导生关系的动态调试过程。博士生的独立研究能力是在导师选择适切的指导方式、师生个体不断转换角色与互动方式的过程中得以形塑的。为此,一方面导师需要提升自身的领导力,学会识别学生的成长变化,并及时调整指导行为、任务难度和人际关系模式;另一方面,学生需要提升自我认知和定位的能力,增强自主学习、挑战自我的主体意识,摆脱依赖心理,自觉保持与导师之间的张力空间。