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991.
针对目前传统的机车信号测试环线安装在钢轨内侧腰部存在一定的磁屏蔽、安装相对不是很容易、施工钢轨穿孔困难等缺点,结合具体施工等实际因素,设计并实现了一种成本较为低廉、安装方便、削弱构成磁屏蔽的一种机车信号测试环线支架法。该方法采用自主设计,特定加工的环线支架固定在钢轨上,环线通过支架安装在钢轨外侧,高度基本与钢轨高度水平。实践证明,这种环线支架法较之前传统的安装方式使用效果良好、信号检测稳定,设计经过实践检验基本合理,能满足机车信号的正常检测,在一定程度上优化了设计,方便了施工,达到了预期目标。 相似文献
992.
以晋陕蒙接壤区黄土泥岩接触地带滑坡为工程研究背景,分析研究黄土泥岩接触面滑坡的工程防护。通过室内试验确定了黄土的基本物理力学参数。利用FLAC2D数值软件,对地区常见的挡墙和锚索工程防护措施,针对坡脚为15°和25°的滑坡模型进行了工程防护的数值模拟,对比其防护效果,并给出工程建议。 相似文献
993.
以工农兵为本位的“人民文学”形态是在历史曲折中形成的 ,创作主体与对象主体的角色意识经过错位与置换 ,导致“人民文学”的现代人学内涵的失落或潜隐 ,有必要重新勘探与阐释 相似文献
994.
This article reports an empirical investigation of the cognitive effort required to decide in multiattribute binary choice using a variation of the Additive Difference strategy. In contrast with other studies, this paper focuses on the effect of various context variables (rather than task variables) on cognitive effort. In order to select the context variables to be manipulated, we used the model proposed by Shugan (1980; J. Consumer Res. 75 (1980) 99). Our results indicate that there is a positive relationship between the cognitive effort required to decide and the mean of the differences between the dimensions of the choice alternatives. We have also found an inverse relationship between cognitive effort and the variance of the differences between the dimensions of the choice alternatives. Finally, we have found that in negative correlation contexts the effort needed to decide is greater than in positive and null correlation contexts. 相似文献
995.
Cory Bolkan Yoshie Sano Jennifer De Costa Alan C. Acock Randal D. Day 《Marriage & Family Review》2013,49(8):563-579
We investigated early adolescents' perceptions of parenting styles in mother–father–adolescent triads along with child self-reported problem behaviors (substance abuse and delinquency). We also examined the various combinations of mothers' and fathers' parenting styles by child gender in relation to problem behavior. Participants included 3,353 children (aged 12 to 14) from the National Longitudinal Survey of Youth—97. Results from our structural equation model indicated that mothers and fathers may use different parenting strategies and that permissive parenting may not be as detrimental as previously assumed. In addition, youth perceptions of each parent were equally important in explaining problem behavior among both daughters and sons, but the perception of an authoritarian mother showed stronger adverse effects on sons, even after controlling for poverty and peer influence. 相似文献
996.
Yves Sprumont 《Social Choice and Welfare》2013,40(4):1015-1032
We reconsider the problem of aggregating individual preference orderings into a single social ordering when alternatives are lotteries and individual preferences are of the von Neumann–Morgenstern type. Relative egalitarianism ranks alternatives by applying the leximin ordering to the distributions of 0–1 normalized utilities they generate. We propose an axiomatic characterization of this aggregation rule. 相似文献
997.
Femke Vanschoonlandt Johan Vanderfaeillie Frank Van Holen Skrällan De Maeyer Marijke Robberechts 《Children and youth services review》2013
Objective
Examining the prevalence of externalizing problems, their predictors and mental health service use for these problems by foster children and foster parents in a representative group of foster children aged 3 to 12 in Flanders.Method
Survey data were collected on 212 foster children, who had been in the foster family for approximately four months. Foster parents filled out a Child Behavior Checklist to measure foster children's externalizing problems. Foster care workers reported on several potential risk variables for externalizing problems and on foster children's and foster parent's mental health service use. Predictors of externalizing problems were identified from a large number of variables using the method of purposeful selection of variables in linear regression.Results
40.6% of the foster children had externalizing problems. Foster children who were placed because of behavioral problems had more externalizing problems. Only 20.9% of the foster children with externalizing problems and only 13.9% of their foster parents received professional help.Conclusions
This study showed that externalizing problems are prevalent in this young foster care population, that it is hard to predict which foster children had externalizing problems, and that foster children and their foster parents rarely receive services for these problems. These findings call for a standard protocol of assessment of foster children's externalizing problems. Moreover, from a preventive viewpoint, guidelines are needed to systematically link young foster children with externalizing problems and their foster parents to appropriate services. 相似文献998.
Filip De Boeck 《Social Dynamics》2013,39(1):47-58
Drawing on ethnographies of divinatory systems as well as on mathematical theories of the Möbius strip, this article unravels the complex weaving and knotting together of forms of sociality and survival in urban Congo. Inhabiting the urban, the author argues, requires strategies of amalgamation that resist being mapped linearly. 相似文献
999.
1000.
De Los Reyes AB 《Initiatives in population》1982,6(3-4):26-29
A sound population program must respond to real human needs, must be rooted in values, must generate results, must be administered in an integrated manner, must be based on the ethic and goal of self reliance and on the belief that it must operate and grow on its own steam, and must release human resources for productive economic endeavors. To make any sense at all, population must be linked to the gut level needs of the individual. People should not be viewed as demographic statistics, and the word human should be used in the basic sense of hunger and poverty. If the goal is to bring about lasting change in the way that Filipinos manage their lives and their living, it is necessary to probe their values. If social change is the goal, tradition must be challenged. In the area of family planning, persons who can communicate the fact that the program seeks to enrich life more than prevent birth must be chosen. There has been some criticism that the population/family planning program is "too contraceptive oriented" and too mechanistic in the approach to population. Contraception is behavior, a good measure of acceptance and an effective measure of commitment. The delivery of welfare must be horizontally integrated. Thus it is necessary to learn to work in teams, teams of development workers. The value of self determination and the conscious practice of planning and shaping one's life is the very logic of family planning. The program needs to implant the values of family planning firmly in the community, or, more accurately, in the small face to face primary groups where social norms are set and where change must take place if it is to last. The answer to how to achieve a sound population program lies less in what is done than how it is done. 相似文献