利用袖珍计算机SHARP PC-1500绘制各种波函数及电子云图形

在结构化学教学中,绘制类氢离子波函数及其各种分布以及电子云的图形是一项基本的训练,按习惯作图法,绘制麻烦、工作量很大。随着教学的现代化,让学生利用现代工具来方便地、自动地绘制出上述各类图形已是十分可行的事情。当然,这并不排斥学生手绘图形的训练要求。     

高中生化学图形认知能力现状探查

运用问卷调查、访谈和放声思维等手段,探查了高中生化学图形认知能力的现状.探查结果显示:(1)高中生化学图形认知能力并没有随年级增长;(2)不同学业成绩学生化学图形识别能力差异显著;(3)不同思维风格学生化学图形认知能力具有显著性差异;(4)学生对图形的识别具有一定的倾向性和目的性;(5)学生图形理解能力中关系理解能力较弱;(6)学生图形再造想象能力有待于提高.     

加聚反应微观动力学

聚合反应微观动力学发展了一些成功的理论。图形分析方法具有严格、简明、普适的特点。化学动力学与物理扩散过程的结合提出了一些新问题,将有力地推动高分子化学和聚合反应工程学的发展。     

基于Matlab的二元共聚物组成与转化率关系曲线的绘制及应用

采用Matlab GUI工具,以单体组成为中间变量,依据共聚物组成方程及单体组成与转化率关系式,开发出一款用于绘制二元共聚合反应共聚物组成与单体转化率关系曲线的图形用户程序。通过对苯乙烯与甲基丙烯酸甲酯、丙烯腈与醋酸乙烯酯等共聚反应的应用表明：该图形用户程序界面友好,交互性强,适用性广,计算便捷,解决了绘制过程中共聚物组成与单体转化率关系式过于复杂而无法找到直接关系的困难,为预测不同竞聚率、不同投料比时共聚物组成与转化率的变化规律,控制共聚物组成,选择控制方法,验证实验,指导生产提供理论依据。     

化学常用图符绘制软件分析比较

根据资料收集和实践,分析比较了8种通用和专业软件在化学符号和图形绘制方面的优缺点。     

绘制化学实验仪器与装置图应注意的几个问题

目前部分化学教育教学论文与教科书中存在绘制化学仪器与实验装置图图形残缺、失真、违反科学原理与构图原理的现象。化学教师要绘制符合要求的实验仪器和装置图,应从仪器的外观特征与内部结构入手,融入立体几何知识、美术构图原理与构图技法。     

Photoshop在绘制化学结构图形中的应用

探讨了利用Photoshop 7.0绘制化学结构图形,并以此作为多媒体课件素材的方法。     

Matlab在二元共聚物组成曲线绘制中的应用

通过Matlab GUI工具开发出一款专供反复使用且操作简单的绘制共聚物组成曲线的图形用户程序.其开发过程包括图形用户界面的构思、控件的绘制与调整、图形对象属性的设置、M文件的编写和程序调试与运行.该图形用户程序可实现绘图、参数显示、坐标捕捉和曲线风格设置等功能.它的使用在高分子化学教学中收到了良好的效果,通过随机输入...     

遗传算法在分子图形显示中的应用

遗传算法在分子图形显示中的应用邵学广，蔡文生，张懋森，赵贵文（中国科学技术大学应用化学系，化学物理系，合肥２３００２６）分子图形和分子模型的研究是计算化学领域中研究的热门课题之一［１，２］，它对于结构一活性相关、有机合成路线设计、药物设计［３，４］等...     

利用化学实验图库绘制实验装置图

介绍了用Windows画图板绘制常见化学实验仪器图的技巧,建立化学实验装置图库的做法和要求,以及利用图库中的化学仪器组合图片绘制化学实验装置图的方法.     

Drawing behavior of cross-linked isotactic polypropylene

The drawing behavior of cross-linked isotactic polypropylene was analysed. The crystallinity and the composition of the crystalline phase are affected by cross-linking. Structural and topological features play a significant role in the drawing behavior. The yielding, the necking phenomenon, and the ultimate properties, i.e., stress and strain at the fracture, can be correlated with the sample structure. The general picture agrees well with Peterlin's model of cold drawing.     

Cavitation during Drawing of Crystalline Polymers

Summary: Cavitation in low molecular weight liquids under tension and in crystalline polymers during tensile drawing was recapitulated. The review indicated that the amorphous phase of crystalline polymers at temperature above its glass transition temperature differs markedly from low molecular weight liquids. Cavitation in polymers seemingly is not of a heterogeneous character, unlike in unpurified low molecular weight liquids. The most probable reasons are: confinements of amorphous layers between crystalline lamellae and macromolecular chain entanglements, the factors that are absent in low molecular weight liquids.     

Drawing and extrusion of semi-crystalline polymers

This review treats mainly the initial transformation of the starting unoriented lamellar material into the final oriented microfibrillar structure and its drawing. If the starting material has partially oriented shish-kebab structure the drawing is a combination of transformation of lamellae into the microfibrils and the drawing of microfibrils. The review article is based on the literature from the last ten years and relys heavily on recent reviewing [1–3]. Older articles are only included if they have contributed to the basic ideas and experiments of drawing.     

一个实用的化学绘图软件

简要介绍化学绘图软件ChemWindow 6 .0的新功能与特点     

利用ChemWindow 6．0绘制流程图

以绘制2007年广东高考化学卷第24题流程图为例,说明了利用分子结构绘图软件ChemWindow 6.0绘制流程图的一般方法.     

Drawing of single-crystal mats of linear polyethylene

Drawing of single-crystal mats of linear polyethylene has been investigated. Drawing is possible at temperatures higher than about 90°C. The drawing is accompanied by distinct necking, with a large decrease in the thickness of the mat and a very high maximum draw ratio, sometimes over 30. The maximum draw ratio is approximately proportional to the thickness of the lamellae. This behavior strongly suggests the unfolding of chains during drawing. A change of orientation of crystal axes occurs before necking without change of lamellar orientation. The a axis orients in the drawing direction; the b axis orients perpendicular to the direction of drawing; and the chain axis tilts away from the thickness direction of the mat. The structure of films drawn from mats is characterized by a distinct double orientation of crystals. This biaxial orientation in the drawn films has a high degree of correlation with the orientation of crystal axes observed before necking, and suggests that necking takes place in such a way that the chain tilts gradually about the b axis and ultimately unfolds. The postulate of formation of transitory two-dimensional crystals in necking seems useful in explaining the double orientation in the drawn film. The orientation behavior of crystal axes observed before necking is not always similar to that observed in the deformation of a single crystal. The difference is thought to be due to the effect of forces induced by drawing that act in the direction normal to the lamellae within a mat.     

基于图形组织者的深度学习研究与实践*——以无机化学课程为例

在无机化学教学中引入图形组织者,引导学生使用不同图形组织者来整理和激发思维,构建思维网络,实现深度学习。实践表明,这种教学策略可有效激发学生的学习动机,促进深度学习的产生,对学生高阶思维能力和自主学习能力的养成起到积极作用。     

化学实验仪器和装置图的画法

绘制化学实验仪器装置图是中师化学实验教学的一个重要内容,是中师生应该具备的基本技能之一。在中师教学中,板书和仪器装置图的绘制往往不被重视。笔者就如何绘制化学实验装置图这一问题谈点粗浅的看法。