电磁线绝缘的剥除方法

介绍了电磁线绝缘漆膜的半自动和自动的剥除方法。并对其中的化学法、砂轮法和刮刀法的优缺点和对不同线规及线型的适应性进行了讨论。     

一种小功率风电系统能量自动转化装置

本文介绍了一种由永磁励磁或电励磁的同步发电机，三相二极管整流桥，Buck型直流斩波器等组成的，负载为蓄电池的风电系统。其中，直流斩波器和电池由微型数字控制器进行控制。在Matlab-Simulink环境下对此系统进行了数字仿真。     

A closed-loop electrical stimulation system for cardiac cell cultures

An integrated electrical stimulation and recording system was designed for closed-loop control and analysis of cardiac cultures on planar microelectrode arrays. Stimulated action potentials from HL-1 clonal myocyte cultures were digitized, stimulation artifacts were removed using nulling and filtering methods, and analysis was performed to determine stimulation efficacy in real time. Results of this analysis were used to determine future stimulation waveform parameters such as polarity, amplitude, pulse duration, and rate or pattern. Algorithms were designed utilizing real-time analysis and control to maintain a desired electrophysiological response of the culture, such as an arbitrary capture fraction value. This paper presents the hardware and software design of the stimulus pulse circuitry, artifact extraction, analysis, and control components of the system. Applications of this technology include the study of cardiac cell physiology, improving the speed and accuracy of traditional open-loop stimulation protocols, pharmacological screening, and improving the performance of biosensors based on sensing electrical activity in cardiac cultures.     

Cooking- and juiciness-related quality characteristics of goat and sheep meat

Significant differences exist between the quality characteristics of meat obtained from 27 sheep, Angora and Boer goat carcases, when compared. Sheep meat showed greater drip loss than goat meat and was more juicy than that of Angora and Boer goat meat. In general, Angora goat meat was found to be more juicy than Boer goat meat. Drip loss increased significantly with increased animal age. Meat of younger animals (no permanent incisors) was more juicy (initial and sustained) than that of older animals (7–8 permanent incisors). This was irrespective of whether it was obtained from sheep, Angora or Boer goats and was confirmed by the expressible moisture measurements. Higher drip, evaporation and total cooking loss were reported when carcases had increased fat content. With increasing fatness of carcases, the juiciness of the cooked cuts decreased and the expressible moisture content of the meat increased.     

用浮选作为煤—金团聚工艺中的分选方法

现有适用于小型矿山的回收金的工艺会对矿山造成严重的环境问题 ,因为要用象汞和氰化物等有毒的化学药剂。称为煤 -金团聚法 (CGA)的回收金的方法是几年前发明的 ,它将矿浆中的疏水的金粒回收到煤 -金团聚体中 ,然后灼烧团聚体 ,以回收金。本文的目的是用浮选法使煤 -金团聚工艺分选过程最佳化。需要将煤 -金团聚法与混汞法进行比较 ,以确定用煤 -金团聚法代替混汞法的可行性。用含细粒金粒 (± 4 4μm)的人工混合物 ( 7g/t)进行了试验。搅拌水溶液中的工业煤和油 ,以使其形成团聚体。经一定的团聚时间后 ,添加矿浆和捕收剂 (如戊基钾黄药 ) ,再搅拌 5min ,然后分出团聚体。载有金的团聚体和尾矿干燥、灼烧、用王水处理和分析。试验规模从 1 50ml(用磁力搅拌器和用刮板人工刮团聚体 )扩大到 1L浮选机 ,最后扩大到 3L浮选机。试验发现 ,用两种浮选机所进行的试验中 ,金的回收率随搅拌速度增快而增加。在某一搅拌速度下 ,金的回收率最高 ,然后又降低。油粘度增大 ,团聚体的强度增大 ,金的回收率也升高。使用粗粒煤时 ,金的回收率高些 ,因为 ,此时团聚体易于浮选 ,金粒易于渗透到团聚体中。团聚体的返回试验表明 ,不仅可以使团聚体的金负载量增大 ,还可降低该法的生产费用。     

“突跳式起动”Spice仿真

在Ｓｐｉｃｅ电路仿真中往往很难起动振荡电路和保持振荡。本文所述的技术有助于这些问题的解决。从概念上讲，一个振荡器是由一个反相增益单元和一个频率选择反馈元件组成的。该元件往往用晶体或谐振器。图１示出了振荡器电路中的晶体的等效ＲＬＣ电路。通常，晶体是一很高Ｑ值调谐电路。振荡器将在晶体的串联或并联偕振时振荡。在Ｓｐｉｃｅ电路中使振荡器起动的关键是在适当的频率给它一个“突跳”。此激励频率应是所期望的振荡频率。实现的方法之一是加一阻尼正弦电压或电流。在Ｓｐｉｃｅ瞬态分析期间，此输入将慢慢地消失，但振荡器的…     

给PC带来Unix性能的EDA工具套件

给ＰＣ带来Ｕｎｉｘ性能的ＥＤＡ工具套件３家公司的高档Ｕｎｉｘ设计软件现在集成为运行于Ｗｉｎｄｏｗｓ的软件包Ｌｉｓａ　Ｍａｌｉｎｉａｋ大约四五年前，电子设计自动化（ＥＤＡ）界就开始争论ＰＣ能否继续作为工程工作站。现在，ＰＣ不仅是ＥＤＡ应用软件的活跃平台...     

把高频的视频信号变换成数字信号的变换器

本变换器是对输入信号电压进行峰值取样的一个高速模-数(A/D)变换器。视频输入信号送到一个多路比较器上,比较器又和一等阻值的梯形电阻网络相连接。比较器的输出端接到一多路“R—S”触发器上。而时间实际上又划分成由时钟周期决定的取样间隔。在每一取样间隔里,触发器的输出表示视频输入信号的最高电平。触发器的输出又接到一对多路前置译码器和一多路转换器上,以数字形式记录视频信号在梯形电阻网络上所达到的电平最高点。这样就将高频视频信号变换成数字信号,简称具有峰值采样的A/D变换器。     

CCD摄象器的象貌缺陷

制作无缺陷的CCD摄象器时需要在改进摄象器件工艺中鉴别缺陷的起因。在视频显示中,下列几种缺陷是经常观察到的:垂直和水平线、局部斑点和条纹。用光学显微镜、化学腐蚀和EBIC法(电子束感应电流)相结合,分析了它们的起因。证实它们与存在于氧化层和多晶硅中的缺陷、在加工中引入硅体内的缺陷以及存在于原始材料中的缺陷有关。详细讨论了它们和原始材料、器件加工步骤的关系以及它们在显示输出中的图象外貌与器件工作条件的函数关系。     

准随机密码是可破的

只要很短一段明密对应的序列就可破开用准随机码进行置乱的体制。懂得这一点是进行更好设计的第一步。