用PC机辅助测量声波在空气中的传播速度实验设计     

宫铁波  张炳恒 《廊坊师范学院学报》2002,18(4):54-56

声速测量是普物实验课教学中的一个重要实验，着重介绍将PC机引入声速测量实验的原理、装置、方法、步骤。  相似文献   

液压系统中液流压力损失的相关分析     

吴红 《宁波职业技术学院学报》2007,11(5):85-87,107

分析液压系统中压力损失产生的原因,液流压力损失与雷诺数的关系,局部压力损失在不同管道下的计算;影响液流压力损失的因素,减少液压系统中压力损失产生的相关方法。  相似文献   

德布洛意波及其波速佯谬     

高峰 《衡阳师范学院学报》1993,(3)

关于德布洛意(De Broglie)波波速问题在许多有关量子力学的书中都有论述,但对波速佯谬却很少分析。上海电视大学金山分校莫之灏同志曾著文“德布洛意波波速佯谬辩析”,发表于《物理通报》一九九○年第五期。但该文中所指佯谬并非唯一,且分析欠透彻。本文全面分析这一佯谬,并给出确切的回答,最后给出德布洛意波的形状及与实物粒子间的关系。  相似文献   

色谱保留指数IR与有机醇结构相关性的拓扑研究     

冀兰 《青海师专学报》2004,24(5):92-94

根据拓扑学机理，本文运用多元线性回归分析将37种有机醇化合物的结构拓扑指数与气相色谱保留指数相关联，结果表明，具有良好的结构性质相关关系．  相似文献   

Labview在微循环流速测量中的应用     

闫家青  潘燕  李桥  孟延  孙文红  李新 《实验室研究与探索》2008,27(2):16-19

探讨了一个基于Labview图像处理模块的微循环流速测量软件系统的构建,并提供了一种无须跟踪同一个血细胞来测量微循环血细胞流速的方法。  相似文献   

纤维质燃料填充床正向阴燃传播特性的数值模拟     

贾宝山  解茂昭  刘红 《上海大学学报(英文版)》2008,12(2):171-179

Based on a three-step kinetic mechanism, a one-dimensional, time dependent, numerical model is presented forthe smoldering propagation in a horizontally packed bed of cellulosic material. The kinetic processes include pyrolysis andoxidation degradation of fuel and oxidation of char. Heat transfer between solid and gas is taken into account, and the diffusioncoefficient varies with the temperature. Radiative heat transfer is included by using the diffusion approximation. The effectsof airflow velocity and oxygen concentration are simulated on the smoldering velocity and the averaged maximum temperatureof smoldering fuel. The results indicate that the spread rate varies linearly with increasing airflow velocity, and the inlet airvelocity has little effect on the maximum temperature. The evolutions of gas species and solid compositions are predicted.The effects of frequency factors (A1, A2 and A3) are analyzed. Simulations show that the smoldering spread rate increaseswith increasing A2 (fuel oxidation), but decreases with A1 (fuel pyrolysis) and A3 (char oxidation).  相似文献   

磁场作用下的磁性流体行波泵研究     

赵猛  胡建辉  徐永向  邹继斌  王黎钦 《大连大学学报》2008,29(3):108-111

磁场作用下的磁性流体行波泵研究是行波泵设计的基础。通过分析了行波磁场作用下的磁性流体的运动方程,从而进一步推导了行波磁场作用下的磁性流体的速度方程、旋转速度方程和单位时间内的流量方程,并通过实验进行了验证。研究表明：行波磁场作用下的磁性流体会产生流动现象;行波磁场作用下的磁性流体流量与磁极旋转的角度有直接关系,磁极旋转的角度越大,其流量也越多;行波磁场的强弱对磁性流体流量也会产生影响,磁场越强,其流量越大;行波磁场的频率只能影响磁性流体的流速,对流量不产生任何直接影响。  相似文献   

高压静电除尘实验研究     

翁棣  唐先进  赵新景  张锦鹏 《实验技术与管理》2006,23(7):17-20

研究了静电电压对除尘效率的影响，实验证明，在其他条件不变的情况下，除尘效率与电压呈正相关（R2=0．9753），随着电压的增加，有效驱进速度也增加，说明可以通过控制电压来控制除尘效率，达到最优化的工况条件，最大除尘效率η为99．4％。  相似文献   

Gas chromatographic method for the determination of hexaconazole residues in black tea     

Karthika C  Sachin PJ 《Journal of Zhejiang University. Science. B》2008,9(2):160-164

A highly reliable, quantitative and sensitive analytical method for determining the residues of the fungicide, hexaconazole in black tea is described. The proposed method is based on liquid-liquid extraction followed by gas chromatographic determination, using nitrogen phosphorus detector (GC-NPD) for the identification and quantitation of hexaconazole. The most was cleaned up by adsorption column chromatography using activated florisil. Performance of the method was assessed by evaluating quality parameters such as recovery value, repeatability, reproducibility, linearity and limits of detection and quantitation. When the method was assessed for repeatability, the percentage of recovery ranged between 86% and 96% while the relative standard deviation was between 0.30% and 2.35%. In studies on reproducibility the recovery ranged from 81% to 85% and relative standard deviation from 1.68% to 5.13%, implying that the method was reliable. A field trial was conducted to verify the application of this method with real samples. Results prove that the validated method was suitable for extracting hexaconazole residues.  相似文献   

模块化的无刷直流电机PWM调速实验系统     

江皓  杜鹏英  任国海 《实验技术与管理》2007,24(9):53-56

针对市场上现有的无刷直流电机调速教学实验仪器不能自主构建控制方式和参数整定方法等不足之处,采用两两导通星型三相6状态工作方式,设计了用逻辑控制芯片控制的无刷直流电机PWM（pulsewidth modulation）调速实验系统,实现了BLDCM的开环机械特性和双闭环控制调速测试等实验。  相似文献