一种专用电路模块测试台的设计与使用

对于技术指标不多、形状规则的电路模块,采用常规的测试夹具和测量仪器就可以达到测试要求。但对于技术指标繁多,测试过程复杂的专用电路模块,利用常规的测试方法,工作效率低下,而且会出现因电源线的极性接反而烧坏产品的现象。因此,设计制作了专用的测试台。根据专用电路模块技术指标的要求,确定了测试台的设计方案。通过测试方法的详细说明,体现了该测试台对技术指标测试的全面性,达到了测试目的,解决了专用电路模块的生产瓶颈,大大提高了工作效率。     

Fatty acid profile of three adipose depots in seven Spanish breeds of suckling kids

Intramuscular, subcutaneous and kidney knob fat depot fatty acid profiles were studied in 104 male suckling kids from seven Spanish breeds: Blanca Andaluza, Blanca Celtibérica, Moncaína, Negra Serrana-Castiza, Pirenaica, Malagueña and Murciano-Granadina. Kids were raised in the traditional production system on mother's milk and slaughtered at around 7 kg live weight. Differences were observed between dairy (Malagueña) and meat breeds (Blanca Andaluza, Blanca Celtibérica, Moncaína, Negra Serrana-Castiza, and Pirenaica). Malagueña showed higher monounsaturated and conjugated linoleic fatty acid levels than the other breeds. Highest percentages of saturated fatty acids were observed in meat breeds. For intramuscular fat depot, the range for desirable fatty acids was 66.16–72.27% was. The influence of breed on fatty acid profiles of intramuscular, subcutaneous and kidney knob fat depots studied was evident. Intramuscular fat depot is proposed as a differentiating factor between dairy and meat breed goat kids, but not between meat breed kids.     

我国高压SF_6断路器的现状及发展趋势

介绍了高压SF6断路器的发展概况,并对高压SF6断路器的性能和灭弧方式进行了着重的阐述.最后结合科学技术的发展,对瓷柱式和罐式SF6断路器的发展趋势作了较为详细的论述.     

带金属杆电位器整机测试评估的研究

本文介绍GB 4706.1-2005《家用和类似用途电器的安全第1部分:通用要求》标准中涉及带金属杆电位器家电的条款,分析金属杆电位器结构存在的问题,提出合理的解决方案。     

断裂与渤海湾盆地形成和油气的关系

断裂对渤海湾盆地的形成起着决定性的作用,总体上看既有拉张也有走滑。早第三纪有四次拉张活动,其中发生在沙三段沉积时期的第二次拉张活动起了关键作用。盆地中的断裂宏观上可以分成三组,即变换断裂值、“多”字型断裂组和旋扭断裂组。这些断裂组织的形成和郯庐断裂带向东偏南平移有关,也与鲁西隆起扭动有关。目前发现的油气田都在坳（凹）陷中,断裂影响着油气生成和运移聚集,也影响着油气的再次运移和聚集。     

基于CAE的调温旋钮注塑模具设计

借助于CAE的Moldflow软件,通过浇口位置与填充分析,找到了调温旋钮最优的四腔排列的浇口位置,有利于工件成型的质量;在此基础上进行了模具的分型、浇注、冷却等系统的设计,最后设计出调温旋钮的模具结构。     

基于MasterCAM对控制旋钮型腔零件数控编程

论述MasterCAM软件在数控加工中的编程过程，重点对控制旋钮型腔数控编程的步骤及工艺进行了分析。     

Movement compatibility for rotary control and circular display--Computer Simulated Test and real Hardware Test

This experiment studied strength and reversibility of direction-of-motion stereotypes and response times for different configurations of circular displays and rotary knobs. The effect of pointer position, instruction of turn direction, and control plane on movement compatibility was analyzed with precise quantitative measures of strength and reversibility index of stereotype. A comparison of results was made between a Computer Simulated Test and a Hardware Test with real rotary controls. There was consensus in the results of the two tests that strong and significantly reversible clockwise-for-clockwise (CC) and anticlockwise-for-anticlockwise (AA) stereotypes were obtained at the 12 o'clock position. Subjects' response times were found to be generally longer when there were no clear movement stereotypes. Nevertheless, differences of results were observed that while the CC and AA preferences were found to be dominant and reversible at all the planes and pointer positions in the Hardware Test, there was variation in the strength and reversibility of the two stereotypes amongst different testing configurations in the Simulated Test. This phenomenon was explained by the operating of the clockwise-for-right and anticlockwise-for-left principles, as shown in the analysis of contributions of component principles to the overall stereotype. The differences of results from the two tests were discussed with regard to simulation fidelity and it was suggested that a real Hardware Test should be used whenever possible for determination of design parameters of control panels in consideration of movement compatibility. Based on the Hardware Test, a pointer is recommended to be positioned at 12 o'clock position for check reading or resetting purpose, and the frontal plane is the best plane for positioning a rotary control with circular display. The results of this study provided significant implications for the industrial design of control panels used in man-machine interfaces for improved human performance.     

Pro／E软件在旋钮三维造型及模具设计中的应用

以旋钮为例,介绍了运用Pro／E软件进行产品造型及模具设计的过程。详细论述了该产品的三雏造型设计方法,重点介绍了模具设计流程及分型面、模具型腔和型芯的设计。阐述了利用Pro／E进行塑料模具设计的高效率特性。     

方钻杆旋塞阀流场的三维数值模拟研究

以Ф114.3 mm整体式方钻杆旋塞阀为例,采用CFD软件对其速度场和压力场进行数值模拟研究,以揭示流场的速度和压力分布,弄清流体在球阀关闭过程中的变化规律。建模时采用有限体积法对控制方程进行离散,用Quick格式处理对流项,压力修正采用二阶格式,方程组的求解采用分离求解和Simple算法。研究结果表明,旋钮水平面处的作用力存在3 MPa差异,增加了该处的疲劳损坏,使得裂纹沿水平面扩展;方钻杆旋塞阀的失效形式均与流场数值模拟计算结果一致,说明流场数值模拟结果是正确的。