打印机

目前数码照片打印成为热点话题，尽管彩色激光打印机在后期成本方面有所控制，但由于其采购及使用成本仍较高，而传统彩色喷墨打印机价格却非常便宜，因此目前大部分个人及家庭用户还是更多选择彩色喷墨打印机。[编者按]     

Achievement of 100% Removal of Oil from Feathers Employing Magnetic Particle Technology

Iron powder has previously been demonstrated to be a potential dry cleansing agent for oiled feathers, whereby both the oil ad(b)sorbing particles and the contaminant may be harvested magnetically. Previous studies on feather clusters have only been able to achieve 97.4% removal. While impressive, this is not considered to be entirely satisfactory for wildlife rehabilitation in practice. Reported in this Technical Note is a series of experiments designed to establish whether a grade of iron powder can be identified that is capable of achieving 100% removal and to identify those characteristics responsible for such improvement. To this end, the abilities of nine different grades of iron powder to remove four different contaminants (three crude oils and a crude oil/seawater emulsion) from feather clusters have been compared, as have the relative physical characteristics of the different iron powders. It has been established that the efficiency of remediation is indeed related to certain physical attributes of the particles (the “grade”). Specifically, a spongy superfine iron powder has been identified that is capable of achieving 100% removal (within experimental error) for all four contaminants tested. This represents an important proof of principle that makes the development of a practical field device a real possibility.     

新型固态故障限流器的仿真研究

介绍了新型固态故障限流器 ( solid- state fault current limiter SSFCL)的基本原理和运行特点 ,并就浙江省北仑发电厂一号机组系统中 5 0 0 k V高压母线进行了仿真研究 .利用电力系统仿真软件 NETOMAC分别模拟、计算并输出了当该系统发生短路故障时 ,系统故障处没有采取限流措施及应用了 SSFCL情况下的电磁暂态过程 ,再对之进行仔细的比较和分析 .仿真结果证明 ,当系统发生短路故障时 ,通过 SSFCL快速而有效的限流作用 ,可以很好地改善该系统的电能质量 .最后 ,还提供了应用的 SSFCL中各电力电子器件的额定参数值 .     

基于消息的单片机多任务编程

将Windows环境下多任务编程思想引入单片机控制系统，在单片机领域引入消息的概念，介绍了单片机控制系统中消息的产生、响应过程，提出并阐述了在单片机控制系统基于消息的多任务编程机制。     

CNC机床加工螺旋锥齿轮的展成原理分析

概述了螺旋锥齿轮加工技术的国内外概况，以矢量为工具推导了Oerlikon C系列CNC机床加工螺旋锥齿轮的展成齿面方程，为机床理论加工参数和实际加工参数的确定打下了基础。     

制造虚拟网络成员企业产量联合优化

分析了制造虚拟网络（MVN）的组织结构及其各成员企业之间的物流关系，建立了描述MVN供应网络物流的投入产出模型，考虑到短生命周期产品市场需求的不确定性，建立了以MVN联合利润最大为目标的各成员企业产量联合优化模型，并证明了目标函数的凹性，发现了目标函数的一阶条件方程决定了超曲面在决策变量张成的平面上的投影为直线，据此给出最优解的解法。     

场控功率器件变频信号隔离式驱动电路应用

本文论述了适用于场控功率器件变频信号的隔离式驱动电路，包括光耦隔离式驱动电路和磁耦隔离式驱动电路。分析了这类驱动电路的结构原理、特点及应用接线，并给出了试验波形。这类驱动电路在AC／AC、DC／AC、AC／DC变换器中具有重要应用价值。     

模式识别在控制系统中的应用

模式识别本质上是一种分类方法，它不需要过程的数学模型即可作出高级决策。该技术已在控制领域的诸多方面得到了应用，体现了其解决复杂系统问题的优越性。本文概述了模式识别方法在控制系统诸方面的应用情况，并指出其今后可能的研究方向。     

GPS接收机测量电离层TEC的数据处理方法

介绍了应用ＧＰＳ卫星接收机ＳＮＲ－８Ｃ进行电离层ＴＥＣ观测的数据处理方法，并给出了部分数据处理结果。其中包括应用ＧＰＳ双频信号进行ＴＥＣ计算的原理，应用卫星星历参数计算各时刻电离层质心点的经度及卫星仰角和方位角，以及ＴＥＣ的周日变化，逐日变化及一次卫星通过时ＴＥＣ的时空变化结果，讨论了该方法的误差来源及与ＮＮＳＳ方法，法拉第旋转测量ＴＥＣ的比较。应用ＧＰＳ方法测量ＴＥＣ具有很大的优点，具有高精度及     

Effect of temperature on the stereoselectivity of phospholipase D toward glycerol in the transphosphatidylation of phosphatidylcholine to phosphatidylglycerol

In this study, the effect of temperature on the stereoselectivity of phospholipase D (PLD) toward the two primary hydroxyl groups of glycerol in the transphosphatidylation reaction of phosphatidylcholine to phosphatidylglycerol (PtdGro) was investigated. For this purpose, PLD from bacteria (Streptomyces septatus TH-2, S. halstedii subsp. scabies K6, and Actinomadura sp.) and cabbage were tested. At the reaction temperatures employed (0–60°C), the proportions of the two PtdGro diastereomers, namely, 1,2-dioleoyl-sn-glycero-3-phospho-3′-sn-glycerol (R,R configuration) and 1,2-dioleoyl-sn-glycero-3-phosphol-1′-sn-glycerol (R,S configuration), which were produced with PLD from Streptomyces TH-2 and Actinomadura sp., changed gradually from 50% R,R and 50% R,S at 50–60°C to 70% R,R and 30% R,S at O°C. These alterations suggested that the stereoselectivity of the bacterial PLD toward the two primary hydroxyl groups of prochiral glycerol was significantly influenced by reaction temperature. PLD from Streptomyces K6 showed relatively little effect of temperature on stereoselectivity, giving 65–69% R,R in the temperature range of 60–10°C examined. The plots of In ([R,R]/[R,S]) vs. 1/T gave good linear fits for these three bacterial PLD. No temperature effect was observed for cabbage PLD, which gave an almost equimolar mixture of the R,R and R,S diastereomers in the range from 0 to 40°C. The temperature-dependent change in enantiomeric selectivity of the bacterial PLD promises potentially profitable commercial exploitation.