城市天然气输配系统阀门的选型

介绍了我国燃气系统用阀门的现状 ,分析了城镇天然气输配用阀门的使用工况、阀门结构性能要求及其合理的选型条件 ,给出了地下管网中燃气阀门的发展方向和选用方法     

逻辑阀在阀门液压驱动装置中的应用

介绍逻辑阀在阀门液压驱动装置中的应用及选型注意事项。     

双坐标电液数字位置的普通开关阀控制系统的研制

介绍了四轴双坐标自动控制生产设备的研制过程,该设备的工作机构采用两个单活塞杆双作用缸机构驱动,由普通开关阀（即定值液压阀）组成的往复等速液压回路控制,并由转角编码器将角位移脉冲信号反馈给计算机,实现了双坐标电液数字位置控制。该控制系统工作稳定可靠、控制准确,并已成功用下生产。     

Modeling of Filling and Solidification Process for TiAl Exhaust Valves During Suction Casting

Investment and suction casting (ISC) represents an economic and promising process route to fabricate automotive exhaust valves of γ-TiAl based alloys, but information available on the metal flow and the temperature changes during mould filling and solidification process for the ISC process is meager. A sequentially coupled mathematical flow-thermal model, based on the commercial finite-volume/finite-difference code FLOW-3D and the finite-element code PROCAST, has been developed to investigate the ISC process. In term of calculating the flow and temperature fields during the filling and solidification stages, potential defects including the gas bubbles and the surface air entrainment occurred in the mould filling process and the shrinkage porosities formed in the solidification process are predicted and the reasons for the formation of these defects are also analyzed. The effects of filling pressure difference control methods and moulds on gas bubble and surface air entrainment behavior are presented. It is found that by changing the filling pressure difference control methods from general suction casting to "air leakage" suction casting and reducing air leakage flow rates, the gas bubbles are eliminated effectively, and the surface air entrainment attenuate dramatically. With resort to a mould with a tetragonal runner, the surface air entrainment decrease to the lowest level. Finally, the water analogue and suction casting experiments of exhaust valves are implemented for further validation of the simulation results.     

Physiological compliance and team performance

Physiological compliance (PC) refers to the correlation between physiological measures of team members over time. The goals of this study were to examine ways of measuring PC in heart rate variability (HRV) data and the relationship between PC and team performance. Teams were tasked with entering both real and simulated rooms and “shooting” individuals with a weapon and identifying individuals without a weapon. The linear correlation and directional agreement PC methods were shown to be the most sensitive to differences in performance, with greater PC being associated with better performance. The correlation method when applied to a measure of respiratory sinus arrhythmia (RSA) revealed a significant difference between high and low performers (t[8] = −2.31, p = 0.03) and the directional agreement applied to inter-beat-intervals and RSA revealed trend-level differences (t[4.62] = −1.86, p = 0.06 and t[8] = −1.68, p = 0.07). These results suggest that PC may have merit for predicting team performance.     

Social psychophysiological compliance in a four-person research team

A continuous, non-invasive and objective measure of teamwork effectiveness could be very useful to the human factors design community. Social psychophysiological compliance (SPC), estimated by scoring the extent that heart rate variation was synchronous across team members, was explored as a predictor of teamwork effectiveness during 20 real planning meetings over a 6-month period. Speech activity and heart rate variability of all four (2 male, 2 female) team members were continuously monitored. Exploratory analyses tested if team member ratings of various aspects of teamwork effectiveness were predicted by SPC scored (1) over whole meetings, (2) during one team member's speech, (3) during periods in which two team members spoke in sequence or (4) over 30-s periods and averaging highest values. SPC during periods of sequential speech negatively predicted team members' ratings of Team productivity, Quality of communication, and Ability to work together. SPC shows potential as an objective, non-invasive means to monitor teamwork effectiveness but this relationship warrants further investigation and replication before use in ergonomics applications.     

当代城市文化背景下的城市功能再生——另一种生态建筑

本文从现代城市文化的角度着手深入探讨了影响城市功能再生的诸多深层社会因素，指出城市功能的再生便是城市文化的再生，城市文化的再生便是城市人文精神的重塑，建筑学意义上的现代城市人文的重塑便是现代城市人对自身生存空间的心理归属，指出存在于现代建筑空间中的另一种生态体系——心理生态，进而提出基于非物质基础上的另一种生态建筑概念.     

秦山核电厂安全壳系统B、C类密封性试验

叙述了秦山核电厂安全壳系统B、C类密封性能试验概况,主要包括试验范围、泄漏率分配、试验结果和总体评价等。     

汽车空调PSX-A制冷系统

汽车空调,由于车速的变化,车室内冷量会随车速变动而波动,尤其是高速或怠速时,能否稳定室内的温度是世界各国极为关注的课题。为此,本文提出一种汽车空调制冷系统,即 PSX—A制冷系统。该系统能解决上述难题,其在各种车速改变的情况下,能自动保持车室内冷量的恒定,达到车室恒温。PSX—A制冷系统,比美 CCOT [Cycling Clutch OrifriceTube]。M—5斜板式压缩机能量控制,VIR部件[Valves—In—Receives]等系统适应范围更广,系统筒单,性能优越,成本低,维修调试方便,是行之有效的系统。