以写字本为例辨析Canvas绘图机制的优劣

通过比较SVG和Canvas两种绘图机制,辨析了使用Canvas在网页中绘图方案的优缺点。使用一个在线写字本案例,论述了Canvas捕获用户的鼠标事件根据用户输入来绘图的过程。最后总结了Canvas绘图的特性以及应用前景。     

现代科技对数码电子类产品外观设计的影响

本文通过介绍和分析现代科学技术的发展趋势,结合产品外观设计的基本目的,以及当今数码电子类产品的发展历程,旨在说明现代科技发展与产品外观设计的内在联系和对其潜在的影响,从而更好的指导产品设计。     

谈笔记本电脑由Windows7系统重装为XP系统

随着win7系统的上市,目前许多新购买的笔记本电脑被预安装好Win7操作系统。但由于种种原因有一部分用户想把Win7重装为Winxp,但是,在重装系统的过程中大多会出现蓝屏或无法读取硬盘等而无法安装成功的情况。经过多次实践,笔者发现这主要是由于Winxp系统安装盘中缺少SATA驱动而导致的。介绍了处理该问题的有效办法——制作一张集成有SATA驱动的winxp系统盘。     

Word环境Matlab馏出液组成恒定的间歇精馏工艺计算研究

以正庚烷-正辛烷溶液为例,研究了Word与Matlab Notebook动态链接和交互作用,计算保持馏出液组成恒定的间歇精馏工艺,得到两个重要结论:(1)釜液组成随回流比变化为Xw=-0.0012R3 0.0276R2-0.2217R 0.7581,呈3次函数关系。因此,操作结束的釜液组成不应低于0.14;(2)数值计算dx取值大小,对精馏时间的影响为T=7.0729dx2 0.045dx 2.5648。故该方程的极限值即为不受计算过程影响的准确精馏时间。     

野外常用地质计算公式及求构造主应力轴——通用地质坐标系应用实例之二

十多个常用的通用地质坐标系公式附在野外记录簿后面,给野外地质工作者带来了很大方便。用电子计算器可在野外根据现场实测的小构造数据随时计算出主应力轴方位,编制的程序可在PC—1500袖珍计算机上进行计算并作图。     

笔记本电脑燃料电池技术

大量便携式笔记本电脑的广泛使用,传统锂电池供电时间已经无法满足人们需要,人们迫切要求寻找新的替代品。甲醇燃料电池以其安全、便捷、可靠、高能效、低污染而被认为最有可能成为下一代便携型设备的主要电源,具有广阔的发展前景。但是目前甲醇燃料电池技术面临着甲醇穿透、催化剂活性低、电极易中毒、小型化成本高、制造工艺复杂等问题,在大规模商业化和产业化的道路上还有很长的路要走。     

Teaching chemical engineering using Jupyter notebook: Problem generators and lecturing tools

The primary objective of this study is to develop teaching materials for chemical engineering students (or students pursuing other related B.Sc./M.Sc. degrees) that encourage self-learning to facilitate understanding and the development of problem-solving skills. Tools are oriented to support the teaching of “Introduction to Chemical Engineering” courses to 1^st year B.Sc. students in Chemical Engineering, 2^nd year B.Sc. students in Chemistry, and 3^rd year B.Sc. students in Biochemistry at the Universidad Complutense de Madrid (UCM). Problem generators of standard exercises, as an additional complement to the exercises that are used in the lectures, seminars, and assignments to facilitate the learning of the students, have been developed. These generators provide exercises to students with “unlimited” initial values (with certain restrictions). The software that was used to develop these materials was Jupyter Notebook, which runs under the Python 3.6 language. The problem generators can be classified into fixed problem generators, case-based generators, and random problem generators. Additionally, lecturing tools have been developed to support teaching using live/interactive examples. These examples can learning understanding of various topics of the courses.     

铝合金笔记本电脑外壳关键技术的开发

从成形、切割、表面粘结层喷涂、模内镶嵌注射成型及表面装饰等方面,对铝合金笔记本电脑外壳制造的关键技术进行了研究开发。结果表明:在同等强度的条件下,相比传统工程塑料制作的笔记本电脑外壳,铝合金笔记本电脑外壳厚度可减薄50%,质量减轻40%,其外观着色性能良好,而且拥有良好的散热性、屏蔽性、耐候性和耐腐蚀性。     

多屏幕多功能笔记本电脑设计与研究

针对市场上各大品牌的笔记本电脑都为单屏显示,只能显示一幅画面等问题,本文通过对笔记本电脑的调查和研究,对系统电路、屏幕的选型、多屏幕、接线端口电路和整体平衡等方面进行了设计。该多屏幕笔记本屏幕间采用磁性接头连接及铰链折叠开合结构,需要扩展时,屏幕间直接通过磁性插头连接或将已经通过磁性插头连接好的屏幕旋转打开,使用方便简单,携带方便。     

Air-borne noise of thermal module and system for notebook personal computers:experimental study

Thermal performance is the most important issue to be considered when a thermal module is designed for a notebook personal computer (PC). Because the fan causes air-borne noise and affects the user’s comfort, the acoustic characteristics of the module attract more attention. Experiments were conducted to study the noise sources, the noise characteristic and the main factors influencing the noise level. The difference between the air-borne noise of the thermal module and the whole computer system was analyzed and its propagating characteristics were derived. The influence of I/O ports on the air-borne noise was also studied experimentally. __________ Translated from Journal of Shanghai Jiaotong University, 2007, 41(3): 465–468 [译自: 上海交通大学学报]