Factorial structure and prognostic significance of premorbid adjustment in schizophrenia.

A sample of 291 resident male schizophrenic patients were rated on the Becker revision of the Elgin Prognostic Scale and on the Phillips Prognostic Rating Scale. 28 items drawn from both scales were factor analyzed. The factors were rotated to both varimax orthogonal solution and to biquartimin oblique solution. The 2 methods yielded a high degree of factorial similarity. 7 factors were: I, Social Withdrawal, Few Interests; II, Inadequate Heterosexual Relationships; III, Socially Undesirable Ward Behavior; IV, Rigid, Flat Affect. and Apathy; V, Insidious Onset; VI, Stubborn and Egocentric; and VII, Chronic Poor Physical Health. Correlations with a measure of chronicity (for 3 social class groupings) indicated that Factors I, II, III, and V have important prognostic power. These findings emphasize the need for a multivariate research approach to premorbid adjustment and the inclusion of the new and prognostically significant Factor III (Socially Undesirable Ward Behavior). (27 ref.) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Environmental risk index: A tool to assess the safety of dams for leachate

Dams for leachate store very toxic substances that contain a large amount of organic material and, probably, heavy metals; they therefore constitute an important threat to the environment. Existing models of environmental risk assessment for landfills do not take into consideration the specific risk that leachate dams may represent for the environment. In this paper a methodology to improve the environmental safety is presented according to the parameters used in their construction and management. In order to do that, the following characteristics of the dam must be known: (1) geotechnical stability, (2) erosion of downstream slope, (3) type of sealing of the dam, (4) overtopping probability, (5) volume of leachate stored inside the dam and (6) pollution load of leachate. Once these parameters have been calculated, they are transformed by means of rating curves into homogeneous units, so as to make it possible to operate between them. From the study and analysis of these parameters an environmental risk index for a dam for leachate can be calculated. If the environmental risk index exceeds an established value then it involves a dam for leachate with high environmental risk, therefore preventive measures in its design, construction and management would be necessary.     

Validity and utility of a multidimensional model of received support in intimate relationships.

The authors of the present study statistically address the largely conceptual debate about the multidimensional nature of received support in intimate relationships. The Support in Intimate Relationships Rating Scale (SIRRS) was factor analyzed in 3 samples of dating and married couples. A novel, 4-factor structure of support types was generated that constituted esteem/emotional, physical comfort, informational, and tangible support types. This structure was reliable and valid in dating and marital relationships, across men and women, and across time. Each support type also demonstrated incremental validity for explaining marital adjustment, depression symptoms, and anxiety symptoms longitudinally. This study is among the first to generate and cross-validate a factor analytically derived set of support types for received support and the first to do so regarding partner support specifically. This is also the first study to replicate a distinct set of support types across different types of intimate relationships, across both sexes, and over time within relationships. Implications for enhancing functional theories of support and for augmenting the construct validity of a multidimensional model of received support are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

基于Cortex-M4的电梯能耗综合测试仪研制

针对电梯能效评估现场作业实际需求及特点,研制了便携式电梯能耗综合测试仪。采用钳式电流互感器和电阻分压网络感测电参数,利用高性能计量芯片采集电梯电量参数,选用DGUS触摸屏实现人机交互,基于32位Cortex-M4和DSP内核架构,应用多任务处理机制,实现电梯能耗数据的采集与处理、人机交互控制、数据存储记录和能效智能评定。该测试仪具有集成度高、操作简便和功能多等优点,有利于提高能效测试准确性及效率,具有推广价值。     

风电齿轮箱轴承寿命计算方法研究

介绍了滚动轴承最新寿命理论和计算方法,讨论了这些计算方法的特点,并结合风电齿轮箱的特点详细分析了影响轴承寿命的几种主要因素。     

单台变频器控制两台参数不同的电动机

从导轨磨机床磨头动作过程出发,引入需解决问题,进一步从原理和梯图控制上进行说明,实现控制过程.     

低压断路器电流参数选择的四要素

开关参数的选择是建筑供配电系统设计的重头工作,对低压断路器作参数选择时,要考虑繁杂的选择、设置、整定问题,往往使设计人员的操作很不顺手.本文以建筑供配电系统中用得最多,需要考虑的选择事项也最多的低压断路器为代表,将其选择理顺为四个方面,使得选择工作有序可循,不会漏项.