风力发电系统变流器高性能电源驱动设计

本文介绍了风力发电系统变流器高性能电源及驱动设计,以AN8026设计变流器电源电路,光耦HCPL316J设计变流器功率模块驱动电路,并通过设计软件AItiumDesignerSummer09绘制PCB,制作调试样机,最后实验验证AN8026控制集成电路设计的软开关电源能够提高开关电源的效率,而基于光耦HCPL316J驱动电路的设计能够增加功率模块驱动可靠性,进而保障整个风力发电系统可靠运行,本论文设计的电源及驱动尤其适合于中小型风力发电系统变流器硬件系统设计需求。     

自动切换转换通道的A/D转换器AD7938及其应用

AD7938是AD公司推出的新型12位高速8输入通道模数转换器，片内自带顺序管理器，能智能切换转换通道，通道接入方式可设定为8路单端、4路差分、4路或7路准差分等4种方式，支持字和字节模式的并行接口，内置2．5V参考电压源，模拟、数字电源分开供电且可不同，软件设定输入电压范围和输出数据格式，功耗很低并具待机、停机模式，使用非常灵活方便。本文介绍了其功能特性和使用方法，并介绍了其与EZ-USB AN2131QC接口，应用于基于USB接口的数据采集卡中的方法。     

QC小组活动是提高企业效益的好形式

本文以华莹公司推进QC小组活动、取得优异效益的事实，论述了质量管理小组对改进企业质量的有效性。     

指纹图谱用于白酒质量的控制

白酒是蒸馏产品,除含大量的乙醇和水外,其香味成分是仅占总量1％左右数百种有机化合物的集合,如醇、酯、酸、羰基化合物、缩醛、酚类等,其中以醇和酯的含量较多,约为千分之几,其它多在万分之几甚至百万分之一以下。由于含量极微,组成又错综复杂,且这些微量芳香成分是形成白酒独特风味的主要原因。     

Preparation and ion conductivities of the plasticized polymer electrolytes based on the poly(acrylonitrile‐ co‐lithium methacrylate)

The polymer electrolytes composed of poly(acrylonitrile‐co‐lithium methacrylate) [P(AN‐co‐LiMA)], ethylene carbonate (EC), and LiClO₄ salts have been prepared. The ion groups in the P(AN‐co‐LiMA) were found to prevent EC from crystallization through their ion–dipole interactions with the polar groups in the EC. This suppression of the EC crystallization could lead to the enhancement of the ion conductivity at subambient temperature. The polymer electrolytes based on the PAN ionomer with 4 mol % ion content exhibited ion conductivities of 2.4 × 10⁻⁴ S/cm at −10°C and 1.9 × 10⁻³ S/cm at 25°C by simply using EC as a plasticizer. In the polymer electrolytes based on the PAN ionomer, ion motions seemed to be coupled with the segmental motions of the polymer chain due to the presence of the ion–dipole interaction between the ion groups in the ionomer and the polar groups in the EC, while the ion transport in the PAN‐based polymer electrolytes was similar to that of the liquid electrolytes. © 1999 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 37: 247–252, 1999     

RoHS指令应对探讨

2006年7月1日,欧盟关于在电子电气设备中限制使用某种有害物质的指令(RoHS 指令)正式实施,对出口电子电气设备的检验和监管带来了一个新的挑战,本文就检验检疫部门新检验监管模式提出了一些思考和建议,面对当前各式各样的企业应对措施,在帮扶企业的同时,提出了一些现今企业忽视的而又较为重要的要素,为企业如何应对欧盟RoHS指令提出了指引.     

三维扫描系统细分驱动电路研究

以863课题“三维扫描仪”的高分辨率扫描为应用背景,提出了3种细分驱动电路系统方案：利用集成芯片UC3717AN的方案,利用IXMS150的方案以及利用分离电子元件组成的驱动电路方案.介绍了3种方案的实现方法并给出了电路图.试验证明这些方案能满足三维测量系统对扫描细分电路的要求.     

利用QC法提高LBS70—2^1型声表面波窄带滤波器成品率

本文介绍运用ＱＣ法，在提高ＬＢＳ７０—型声表面波窄带滤波器成品率方面所取得的明显效果。     

MAN向B—ISDN过渡方法的研究

本文比较了利用窄带ＩＳＤＮ和帧中继技术与利用城域网（ＭｅｔｒｏｐｏｌｉｔａｎＡｒｅａＮｅｔｗｏｒｋ－ＭＡＮ）来实现过渡的两种方案，指出利用ＭＡＮ过渡到Ｂ－ＩＳＤＮ具有更多的优越性，ＭＡＮ是为适应局域网（ＬＡＮ）互连和高速数据通信而发展起来的，网距离通常可达３０～５０ｋｍ，由于它的信元格式和传输方式上与Ｂ－ＩＳＤＮ的兼容性，使得它成为从现有网络向Ｂ－ＩＳＤＮ过渡的最佳中介域网技术。     

Practical and theoretical implications of target values in clinical chemistry: a QC approach

The automation of test validation procedures in a routine clinical laboratory by integrating artificial intelligence with the lab information system (LIS) is the focus of this study. Test validation consists of three layers: (1) acceptance of patient results based on technical criteria (technical validation), (2) acceptance of patient results based on internal quality control (QC) results (QC validation) and (3) medical validation of the patient protocol. The emphasis here is put on QC validation. General concepts regarding the setting of performance limits for internal QC results are briefly reviewed. As a practical example, we describe how the different layers of test validation were integrated with Molis, a LIS (Sysmex, Barchon, Belgium) used in a routine clinical biochemistry lab. PGP5 software (PGP, Brussels, Belgium) is used for technical validation and is installed on a Linx work-cell (Thermo Clinical Labsystems, Vantaa, Finland). The latter integrates four different Vitros instruments (OCD, Beerse, Belgium). QC validation and medical validation are performed with QC-Today (IL, Zaventem, Belgium) and VALAB (Erim, Toulouse, France), respectively. Both programs are bi-directionally coupled with the LIS. After 2 years of experience with this integrated system, it is clear that automation of validation rules and procedures has enhanced efficiency and overall quality of patient results.Presented at the Ninth Conference on Quality in the Spotlight, 18–19 March 2004, Antwerp, Belgium.