滴管玻璃管身在微型化学实验中的应用

胶头滴管的玻璃管身外形小巧 ,中部膨大而两端管口大小各异 .这些构造上的鲜明特点使它在微型化学实验中用途广泛     

水下航行器一体化、分布交互仿真环境设计与实现

基于一体化仿真方法进行了局域网下五个仿真节点组成的水下航行器分布交互仿真环境的设计，利用Winsock2．0完成了网络通讯接口——专用通讯接口协议数据单元的开发，应用SQL Server完成了仿真数据库的设计，实现了潜-舰、潜-潜多武器平台作战对抗仿真功能。所完成的一体化分布交互仿真环境具有以下优点：集仿真建模、实验、结果分析全过程的一体化；利用人机界面可以对各仿真平台的系统模型及随机误差参数进行设置、修改和存储；通过设置不同的航路和仿真次数能够重复地进行分布交互仿真并获得统计结果。该项研究成果已在某航行器系统战技指标评估研究项目中得到应用。     

一拖三变频空调系统建模方法及控制研究

一拖多变频空调系统由于各蒸发器状态参数间的相互影响,使得系统的控制特性相当复杂,也增加了对系统进行动态建模的难度。为此,本文以一拖三系统为例,采用集总参数法,建立起系统的动态热力学模型;同时提出了系统中变频压缩机和电子膨胀阀的控制策略,引入了吸气压力控制和以电子膨胀阀直接控制室温的思路;制定了带有调整因子的模糊控制方法;利用系统热力学模型对控制策略和方法进行仿真研究,仿真结果表明所提出的控制策略和方法是有效可行的,能取得满意的控制效果。     

新女排国手十二个队员技术点评

本论通过观看新一届女排在2007年的全部世界比赛实况、录像后，从排球微观技术的视角，观察、分析新一届女排12位队员当前技术状况，认为需要从训练特别比赛的实战出发，对新女排在比赛中技术串联各环节，特别是主攻手强攻，全队默契配合，强化心理训练，大力挖掘臂力，旨在群策群力、集思广益，为新一届中国女排在2008年北京奥运会排球比赛取得好成绩．     

Keratinase production and keratin degradation by a mutant strain of Bacillus subtilis

A new feather-degrading bacterium was isolated from a local feather waste site and identified as Bacillus subtilis based on morphological, physiochemical, and phylogenetic characteristics. Screening for mutants with elevated keratinolytic activity using N-methyl-N＇-nitro-N-nitrosoguanidine mutagenesis resulted in a mutant strain KD-N2 producing keratinolytic activity about 2.5 times that of the wild-type strain. The mutant strain produced inducible keratinase in different substrates of feathers, hair, wool and silk under submerged cultivation. Scanning electron microscopy studies showed the degradation of feathers, hair and silk by the keratinase. The optimal conditions for keratinase production include initial pH of 7.5, inoculum size of 2% （v/v）, age of inoculum of 16 h, and cultivation at 23 ℃. The maximum keratinolytic activity of KD-N2 was achieved after 30 h. Essential amino acids like threonine, valine, methionine as well as ammonia were produced when feathers were used as substrates. Strain KD-N2, therefore, shows great promise of finding potential applications in keratin hydrolysis and keratinase production.     

AC——3系统功能及原理浅析

通过对AC-3系统的结构和功能的分析,论述了该系统的内在工作原理及应用前景.     

扎染CAD设计效果图到工艺图的自动转换

在扎染制品CAD系统开发中,从设计效果图到生产工艺图的自动转换是一个十分重要的问题。文章结合扎染制品图样繁杂,色彩丰富的特点,通过对常用边缘检测算法的改进,并具体编程实现,在实际生产应用中取得了良好的效果。     

欲望世界的一针清醒剂--《受活》读后

《受活》以对权力政治社会的反思与鞭挞完成了对理想的民间自治社会的期待与向往,以独特的人文视角启迪人们对现实社会进行思考,同时,小说以返朴归真的美学尝试给欲望世界的人们以镇定从容的审美净化。     

Dissolution behavior and dissolution mechanism of palygorskite in HCl solution

The 1 mol/L, 3 mol/L and 5 mol/L HCl solutions were employed to leach two palygorskites with different trioctahedral contents in their crystal structure for different period of time. The results of the dissolution experiments show that the dissolution process could be divided into three steps, and that this dissolution behavior can be attributed to its higher Mg2+ content, and is restricted by the extraction behavior of Si4+. The preferential extraction for Mg2+ promotes the extraction behavior of Si4+ from Si-O framework. Because the Si4+ in the form of amorphous SiO2 is adsorbed onto the surface of palygorskite fibre, the reaction between palygorskite and acid is obstructed. With the elapsing of time, or the increasing of the acid concentration, the amorphous SiO2 flocculates, and then the channels of chemical reaction are reopened. The ratio value of Mg2+/(Fe3++Al3+) in leaching solution tends to a fixed value, showing that the acid attacks not only the surface but also the structural channels. There are no obvious three steps observed during the acid attack on the palygorskite with a lower trioctahedral content. The differential behavior for two palygorskites is discussed.     

封头的一种非常规冷压工艺及其模具设计

分析对比了冷压工艺生产封头对热压工艺的优势，重点介绍了封头的一种非常规的冷压工艺，研究结果表明：这一方法对提高产品质量、降低生产成本以及提高压力容器的专业化生产水平具有一系列技术、经济优势。