Work/family demands, work flexibility, work/family conflict, and their consequences at work: A national probability sample in Taiwan.

The aim of this research was to explore relations between work/family demands, work flexibility, work/family conflict, and work-related outcomes in the cultural context of Chinese society, using a national probability sample. For Taiwanese employees, work demands were positively related to work/family conflict, whereas both work and family demands were positively related to family/work conflict. Work/family conflict was negatively related to job satisfaction and family/work conflict to organizational commitment. More importantly, the authors found that organizational policies and practices such as work flexibility could alleviate feelings of work interfering with family, further enhancing job satisfaction and organizational commitment. It is recommended that various family-friendly company policies be reformulated taking into account core cultural values such as individualism-collectivism. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

波前编码技术扩展焦深的系统实验

为了扩大光学系统的焦深,建立了采用波前编码技术的光学/数字一体化系统,通过在普通光学系统孔径光阑处加入一个位相掩模板和后期数字处理的优化结合,实现了光学系统焦深的大幅扩展。介绍了波前编码技术的提出、发展及理论基础,设计了一个三片式的三次位相板系统,利用光学设计软件CODEV对传统系统和波前编码系统的成像特性进行了对比分析,给出了±40倍离焦范围内的点扩散函数三维轮廓图和调制传递函数曲线。最后,对研制的系统进行成像实验,并对波前编码系统解码前后的成像效果与传统系统进行了比较。实验结果表明,与传统系统相比,所设计的波前编码系统可以在保持光通量和像面分辨率的情况下将焦深扩展40倍。     

计及风电功率波动影响的风电场集群无功电压协调控制策略

针对大规模风电场集群区域有功出力随机波动、无功设备种类繁杂等典型特征引起的无功电压问题,提出一种计及风电功率波动影响的风电场集群无功电压协调控制策略。该策略根据风电功率预测信息、当前运行信息和历史断面信息建立多目标优化控制模型,并采用基于过滤集合的内点算法求解。通过利用汇集站和风电场的自动电压控制子站实现闭环控制,该控制策略能够对集群区域内离散设备和动态设备的动作响应实行差异化管理。对中国"三北"地区某实际风电场集群地区进行仿真计算,结果表明,所提控制策略能够改善中枢节点的电压控制效果,协调离散设备和动态设备的运行配合,维持集群区域的静态电压稳定性。     

A comparative study on the performance of MIMO‐STBC subject to Weibull fading channels

In this paper, we investigate the analytical performance of the multiple‐input multiple‐output system (MIMO) with orthogonal space‐time block codes (STBCs) subject to Weibull fading channels (WFC). Space‐time block code technique provides an efficient pattern for wireless transmission over various fading channels using multiple transmit antennas. Two approximating methods of the sum of independent Weibull random variables are studied. For each approach, we derive accurate approximate expressions for several performance metrics of MIMO‐STBC system operating under independent and nonidentical WFC. The proposed approximations are expressed in terms of 2 generalized hypergeometric functions, namely, Fox's H and Meijer's G functions. All the derived approximate expressions prove high accuracy, while compared with the simulation results established via Monte Carlo method and Kolmogorov‐Smirnov test as well. Although the 2 approaches have approximately the same accuracy, the second method approximate expressions are much less complex than those of the first method.     

基于遗传算法的波前编码相位板参数优化

波前编码(WFC)是一项使光学系统在维持相对孔径的同时扩大焦深的新技术。现以光学传递函数稳定性作为目标函数,以遗传算法作为搜索算法,优化得到一个适用于焦距f为100mm,光圈F为5,最大半视场角3°的双胶合透镜系统的波前编码相位板的修正形式的三次项系数。模拟结果表明在像面固定的情况下,传统光学系统只能在无穷远到300m内清晰成像,而经优化的波前编码系统可以在物距无穷远到5m内清晰成像,大幅度增加了光学系统的景深。     

高压下水泥灌浆材料的性能研究

通过室内模拟灌浆试验研究了高压下(P=5．0MPa)水灰比、水泥品种等因素对浆液及其结石力学性能的影响。结果表明：高压下水泥浆材的凝结时间明显缩短，结石的力学性能显著增加；与常压下不同，当水灰比为1：1时，结石的抗压强度最高。在3种灌浆材料中，湿磨细水泥结石抗压强度最高。     

KJF2000矿井监控系统软件的设计与实现

探讨了中心站与数据传输接口装置通过串口通讯的三种方法的优劣、中心站与服务器或终端网络通讯的实现方法 ,描述了MFC实现多线程应注意的问题以及采用ADO访问数据库的方法。     

波前编码系统的一种新设计方法

摘 要：本文提出波前编码成像系统的一种优化设计思想,可以利用常用光学设计软件进行系统的优化设计。采用此设计思想设计出一采用波前编码技术的三片式系统,其焦深范围比传统系统扩展10倍以上。最后探讨了波前编码系统设计时“离焦不敏感性”和“图像可恢复性”之间的平衡问题。     

Reliability analysis and initial requirements for FC systems and stacks

In the year 2000 Wärtsilä Corporation started an R&D program to develop SOFC systems for CHP applications. The program aims to bring to the market highly efficient, clean and cost competitive fuel cell systems with rated power output in the range of 50–250 kW for distributed generation and marine applications.     

流动温压成型时间和温度对粘结钕铁硼/铁氧体复合磁体性能的影响

采用快淬NdFeB磁粉和铁氧体磁粉复合,流动温压成型制备出各向同性粘结钕铁硼/铁氧体复合磁体,研究了流动温压工艺对磁体密度和磁性能的影响.结果表明,随着流动温压成型时间的延长和温度的增高,磁体剩磁Br、内禀矫顽力Hcj、最大磁能积(BH)max和密度增大,当达到一定值后开始减小.矫顽力温度系数β随成型时间的延长有下降的...