组合形体的解读和绘制方法

组合体的投影作图,一直是学生在学习画法几何和工程制图当中的一大问题。本文通过切割、组合等方式,并结合立体图使学生可形象、直观地掌握组合体的解读和绘制的方法。     

相对柔韧性测评有效性的研究

采用逻辑法和实验法，对相关柔韧性测评方法的有效性进行了分析。结果表明，在相关柔韧性测评时用比值法比线量法更有效。线量法与比值法高度相关或负相关，具有效标有效性。线量法在对柔韧性较差人群进行评价时，可能有一定不足。建议采取比值法进行相关柔韧性的测评。     

论体育教学评价与体育测量的关系

从教育学的角度,探讨体育测量与体育评价的关系。体育测量属于事实判断,体育评价属于价值判断,测量为评价提供量化资料。素质教育下的体育评价强调体育的教育性功能,侧重于体育的目标评价与个体评价,评价的重点由终结性评价转向过程性评价,突出他评与自评的相互结合。     

浅谈现代重彩画

新材料的研制和开发引起了现代重彩画的变革。本文通过传统重彩画和现代重彩画的比较表明了现代重彩画形式语言和表现手法的多元化和自由化。从而突出了现代重彩画的艺术特点和技巧美。     

Microsoft Word在体育绘图中的应用

本文介绍了Word绘图功能在体育绘图中的运用以及常用绘图工具的功能和使用技巧。并结合实例绘制了场地器材图、队列队形图、教学组织图、运动人体图等图形，解决了在编写教案和上课时所遇到的困难，从而降低了学生的学习难度，缩短了学生掌握动作的时间。大大提高了教学效果和教学质量，使得计算机在体育教学中的运用得以推广，并丰富了体育绘图的教学形式。     

WORD中快速创建数学图形的方法

Word是微软开发的一款功能强大的图文处理软件,深受广大用户的欢迎。笔者从Word所提供的绘图工具入手,利用W ord的用户接口,提出对Word进行二次开发,快速创建数学图形的一条途径。     

枣品种含糖量的测定与比较

鲜枣的含糖量是评价一个枣品种是否优良的主要技术指标之一.现详细介绍了鲜枣含糖量的测定方法,并对滨州市21个枣品种的含糖量进行了测定与比较,为广大农民优化种植结构、种植优良枣树品种提供科学依据.     

由电路板画电路图方法的研究

文章介绍了利用扫描仪和Photoshop、Protel两种工具软件，在电脑上绘制双面印刷电路板的电路图的方法和步骤。     

Critiques of socio-economic school compositional effects: are they valid?

Abstract

School socio-economic compositional (SEC) effects have been influential in educational research predicting a range of outcomes and influencing public policy. However, some recent studies have challenged the veracity of SEC effects when applying residualised-change and fixed effects models and simulating potential measurement errors in hierarchical regression models. We review the residualised change and fixed effects methods in critical studies and find limitations in their capacity to demonstrate null compositional effects. We show this with an adjusted residualised change model finding significant SEC effects. We show structural equation models can address concerns that measurement errors inflate SEC effects by comparing hierarchical regression models to structural equation models. We find that structural equation models can detect SEC effects free from measurement error. We conclude that the reviewed critiques of SEC effects were due to methods unlikely to detect compositional effects. Future research would benefit from the identification of mediators of SEC effects.     

Vapor Pressures of Di-n-Butyl Phthalate and Di-iso-ButylHexahydrophthalate at Reduced Pressures

In this paper the measured values of the vapor pressures by ebulliometer method of two important maleic anhydride recovery solvents, di-n-butyl phthalate (DBP) and di-iso-butyl hexahydrophthalate (DIBE),between 0. 63-17. 79 kPa and 0. 49-30. 95 kPa,are reported respectively. A comparison of the data of DBP with the published data has been made, which shows good consistency. For the convenient use of these vapor pressures, Cragoe equation, Antoine equation and Kirchhoff equation are selected to correlate them. The correlating results show that Antoine equation is the best one of the three equations to fit for the vapor pressures of the two solvents. According to Clausius-Clapeyron equation, the linear relationship between natural logarithm of pressure and reciprocal of temperature is used to calculate the molar latent heats of evaporation of the two organic solvents. The molar latent heats of evaporation of DBP and DIBE are 75.1 kJ/mol and 67.7 kJ/mol, respectively.