RSD开关暂态电流测试平台建模与仿真

为优化包括RSD开关暂态电流试验平台和罗氏线圈检测装置的整个系统的电气参数,分析了RSD开关暂态电流试验平台的构建原理、试验回路的简化模型和基于自积分式罗氏线圈检测系统的工作机理后利用MAT-LAB软件中的SINMULINK仿真环境,建立了该试验平台的仿真模型,给出其仿真分析方法及其实验测试结果。研究表明,利用MATLAB软件中的SINMULINK仿真环境描述基于自积分式罗氏线圈测控装置用于监测RSD开关试验时暂态电流的仿真模型可为RSD开关试验时测试暂态电流提供一套合适的计算机仿真平台,利于优化试验回路和检测系统的电气参数,确保试验成功。     

基于元数据的关系模式等价性评价机制

借助于 Web,异地分布的异构关系数据进行融合与交互成为可能 ,提出具有不同模式描述的关系数据自动地进行融合和交互的第一步是对关系模式进行基于语义信息的等价性评价这一概念 ;提出关系模式等价的定义、及其具有自反性、传递性和对称性的性质 ;提出关系模式描述文件这一元数据的定义和生成规则、并给出其 DTD;最后给出并实现了算法     

运用谐振触发方式的RSD脉冲电源

本文提出了一种运用谐振原理的可重复RSD脉冲电源。分析电路的工作特性并对其重要元件磁开关进行了重点设计。给出了实验结果，最后提出了几种改进电路参数的方法。     

RSD requirement for different sample size for blend sampling

A formula for calculating the equivalent relative standard deviation (RSD) for different sample sizes other than the Office of Generic Drugs (OGD) draft guidance was derived. These critical values vary with the population RSD and the sample size and guarantee the same confidence of passing a batch similar to the OGD blend uniformity test. Simulation results showed that the normal approximations give very close results to the simulation results. An assessment of the proposed OGD blend uniformity criteria against the first-stage USP content uniformity (CU) criteria for tablets was also made.     

A High Power Semiconductor Switch RSD for Pulsed Power Applications

High power switch is one of the most important components in pulsed power technology. The RSD （Reversely Switched Dynistor）, turned on by a thin layer of an electron-hole plasma, is a high power semiconductor switch. In this study, the RSD turn-on conditions were investigated by numerical analysis and device simulation as well as the experiments conducted to validate the turn-on conditions. A design of a triggering high-voltage RSD is presented based on a saturable transformer.     

基于RSD的脉冲放电系统主回路仿真与试验

研究了基于RSD开关的脉冲放电主回路,应用ATPDraw软件仿真了不同主电容、主电压、负载电阻条件下的输出电流波形,并在测试平台上进行了相应的开通试验.试验研究了不同叠片片数和不同主电压下磁开关的输出电压波形,为其配合RSD使用、保证合适延迟时间提供了依据.进行了直径40mm的RSD管芯极限通流试验,200μs脉宽下获得峰值电流42kA,与经验公式吻合.计算和试验结果都反映了RSD开通电压随峰值电流增大而增大的趋势.     

A quadtree data structure for the coupled finite‐element/element‐free Galerkin method

In the present paper, we derive an efficient data structure for the organization of the nodes in the coupled finite element/element‐free Galerkin method. With respect to its implementation, we compare various approaches of recursive spatial discretizations that facilitate most flexible handling of the nodes. The goal of the paper is to refine the implementation issues of the data structure which is fundamental to the element‐free Galerkin method and thus to speed‐up this otherwise computationally rather expensive meshfree method. Copyright © 2001 John Wiley & Sons, Ltd.     

Estimation of Relative SD

The relative SD is a measure that is now in common use in the pharmaceutical industry, for example, in pharmaceutical development and analytical chemistry, pharmacology, and quality control. This article comments on the usual point estimate of the true value; presents seven interval estimation methods, easily implemented on a desktop computer; and compares their individual merits and drawbacks. Finally, the question of determining an adequate sample size is addressed, and a possible solution is indicated.     

Development of a quantitative method for headspace analysis of methylsulfanyl-volatiles from kiwifruit tissue

Minor fruit volatiles are likely to be missed using sampling techniques optimized for the extraction of major compounds. This can be a disadvantage if these minor compounds contribute to characteristic fruit flavors. In this comparative study, headspace solid-phase microextraction (HS-SPME) and dynamic headspace sampling (DHS) parameters were systematically optimized to ensure highest extraction yields of methylsulfanyl-volatiles from kiwifruit tissue samples. A significant “salting-out” effect from the fruit matrix was observed using both sampling techniques after (NH₄)₂SO₄ saturation. HS-SPME at optimized conditions (polydimethylsiloxane-divinylbenzene-coated fiber, (NH₄)₂SO₄ saturation, 5 min equilibration and 20 min sampling at 40 °C) was faster and more convenient to use than DHS for qualitative purposes. Despite this, the qualitative and quantitative methylsulfanyl-volatile profile was improved using optimized DHS ((NH₄)₂SO₄ saturation; sampling time 20 h; flow rate 30 mL min^− 1) compared with HS-SPME, making this the more sensitive and preferred method for quantitative studies. The optimization strategies for increasing headspace extraction yields of trace compounds presented in this study can easily be applied to tissue samples from other fruit.     

多氨基化合物(RSD)接枝改性竹浆纤维的性能研究

利用实验室自制的多氨基化合物(RSD)对竹浆纤维进行接枝改性,测试分析了改性前后竹浆纤维的染色、抗菌、抗紫外性能的变化.结果表明:RSD改性竹浆纤维无盐染色与未改性竹浆纤维常规染色相比,K/S值、染料上染性均提高,可以实现无盐染色,并对染料具有广泛的适用性;当RSD质量浓度达到4 g/L时,改性后竹浆纤维具有较好的抗菌及抗菌耐洗性,抑菌率均达到88%以上.此外,织物UPF值由8.53上升到19.28,抗紫外性能明显提高.