Social dominance orientation and the political psychology of gender: A case of invariance?

Social dominance theory assumes transsituational and transcultural differences between men and women in social dominance orientation (SDO), with men showing higher levels of SDO than women. SDO is a general individual-difference variable expressing preference for superordinate in-group status, hierarchical relationships between social groups, and a view of group relations as inherently 0-sum. Data from a random sample of 1,897 respondents from Los Angeles County confirmed the notion that men have significantly higher social dominance scores than women and that these differences were consistent across cultural, demographic, and situational factors such as age, social class, religion, educational level, political ideology, ethnicity, racism, region of national origin, and gender-role relevant opinion. The theoretical implications are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

单级泵站不同机组流量分配的优化研究

调水工程中泵站建成后,在不同的时期承担不同的调水任务,为了完成各种调水任务,往往使水泵在不同的工况点运行。基于离散的单级泵站运行工况点,对泵站的流量分配进行了优化研究;在满足水泵流量、扬程和各种水力学条件的约束下,以泵站整体效率最高为目标函数,基于一些工况进行了不同机组流量分配的对比研究,建立了流量优化分配数学模型,得出了各个工况点下泵站内机组流量分配的最优组合。     

基于Excel平台的矩形渡槽槽身优化设计及优化机理研究

以矩形渡槽槽身断面优化设计为目标,选择应用广泛的矩形渡槽为案例,基于渡槽基本体型及相关设计规范,以其力学性能、稳定性能、几何要求为约束条件,借助Microsoft Excel平台及其"规划求解"功能,建立了矩形渡槽槽身优化模型的求解方法并使用该方法对重庆市开县鲤鱼塘水库东河分干渠工程灌区渠系渡槽进行了优化,深入分析优化变量的优化机理。结果表明,在满足各项约束的条件下,侧墙宽度对优化的限制最大,支座厚度对优化限制最小,调整侧墙宽度可最快优化断面。该优化方法可有效减少混凝土使用方量且优化过程简单快捷,能为矩形渡槽的设计及优化提供一定参考。     

常见的功率谱估计方法及其Matlab仿真

功率谱估计是数字信号处理的重要内容之一,又分为经典谱估计和现代谱估计。经典谱估计主要是周期图法及其改进方法,现代谱估计则有参数模型与非参数模型谱估计之分。文中主要介绍了几种常见的功率谱估计方法的原理、特点,并进行了Matlab仿真分析,发现基于AR参数模型的Burg法效果较好。     

随行振动胶塞用芳纶纤维布复合材料的制备及摩擦磨损性能

针对石油钻井中使用的随行振动胶塞与套管、岩石摩擦磨损较大的问题,提出采用芳纶纤维布复合材料来增强随行振动胶塞的耐磨性。根据Bnierley经验公式法试织出6种不同经纬密度的试样织品,借助万能磨耗机试验研究织物不同经纬密度和不同摩擦转速对芳纶纤维布复合材料耐磨性的影响。结果表明:摩擦转速一定的条件下,织物经纬密度越大,芳纶纤维布耐磨性越好;织物经纬密度相同的条件下,在一定摩擦转速范围内,芳纶纤维布耐磨性随着摩擦转速的提高而增强,但当摩擦转速过高时芳纶纤维布的耐磨性会出现下降趋势。     

掺杂Ce对Pd-Co/Cu-Co-Mn混合氧化物催化体系氧化羰基化法合成碳酸二苯酯

Effect of doping cerium in the support on the catalytic activity and side product of the reaction in the oxidative carbonylation of phenol to diphenyl carbonate (DPC) over the catalyst Pd-Co/Cu-Co-Mn mixed oxides was studied. The specific surface areas, crystal phase, valency, and content of the element on the surface of the catalysts were determined, and the products were detected by gas chromatograph/mass spectrometry (GC-MS). It is found that the catalyst without Ce shows higher activity than that with Ce, and the yields of DPC for the two catalysts can reach 30% and 23%, respectively. However, doping cerium can prevent the formation of 2-hydroxyphenyl benzoate and p-bromophenyl phenyl carbonate.     

原位合成Al6．1 Cu1．2 Ti2．7／Al2O3／TiAl复合材料及热力学分析

采用真空热压烧结方法在Ti—Al—CuO体系下原位合成了Al6.1 Cu1.2 Ti2、Al2O3物相共同增强的TiAl基复合材料。通过DSC,XRD以及相关热力学计算研究了热压反应过程。结果表明：Al在高温熔化后对Ti、CuO颗粒润湿并发生反应,Ti颗粒表层形成中间产物TiaAly,在富Ti区生成稳定TiAl相;CuO颗粒表层由于Al-CuO置换反应的发生,生成稳定的Al2O3相和活度较高的Cu单质,一定条件下TiaAly与Cu反应形成Al6.1Cu1.2Ti2.7三元相。     

麦克风基阵结构的噪声源识别性能研究

为更好地应用麦克风阵列识别噪声源位置,本文针对多种不同基阵结构的噪声源识别性能展开研究.基于"延时-累加"波束形成原理建立了平面任意麦克风基阵结构的数学计算模型,并给出了麦克风基阵声源定位的通用计算方程组;分别推导分析了二元、三元及四元基阵的定位算法公式,并对三元基阵给出了其矩阵解.分析比较不同类型的麦克风基阵结构对噪声源的识别性能影响.通过建立由不同形式基阵构成的同等规模小型麦克风阵列,进行噪声源识别对比测试,最终的测试结果验证了本文所提出模型及算法的可靠性,并得出由正三元基阵构成的麦克风阵列结构具有较好的噪声源识别性能的结论.     

Improved Circularity Metrology of Small Cylindrical Workpieces by the Segmenting-stitching Technique

To address the alignment and measuring force problem in the segmenting-stitching technique for the circularity metrology of small cylindrical workpieces (diameter less than 1.5 mm and length less than 10 mm), a magnet combination jig method is proposed. A small round magnet is attached between the round magnetic jig and small cylinder, and the other end of the small cylindrical workpiece is attached to some cylindrical magnets. Thus, the smaller cylinder can be put in the V-groove and measured successfully with the magnet combination. For ver-ifying the advantage of the magnet combination jig, four measurement quality evaluations are proposed: the circumferential deviation of neighbor arc contours, radial deviation of neighbor arc contours, angle of inclina-tion between the V-groove and small cylinder, and curvature of the obtained arc. The results show that the matching coefficient is enhanced by 98%, the Euclidean distance of overlap parts of neighbor arc contours is reduced by 68%, the position error is reduced 27%, and the average curvature of the arc contours is improved. It can be concluded that the measuring quality can be enhanced prominently by this magnet combination method for the segmenting-stitching method.