首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   266篇
  免费   10篇
管理学   19篇
民族学   3篇
人口学   14篇
丛书文集   3篇
理论方法论   24篇
综合类   1篇
社会学   197篇
统计学   15篇
  2022年   1篇
  2019年   4篇
  2018年   4篇
  2017年   10篇
  2016年   5篇
  2015年   10篇
  2014年   6篇
  2013年   50篇
  2012年   13篇
  2011年   10篇
  2010年   6篇
  2009年   8篇
  2008年   13篇
  2007年   10篇
  2006年   9篇
  2005年   13篇
  2004年   9篇
  2003年   5篇
  2002年   9篇
  2001年   8篇
  2000年   5篇
  1999年   5篇
  1998年   4篇
  1996年   1篇
  1995年   6篇
  1994年   3篇
  1993年   2篇
  1992年   3篇
  1991年   2篇
  1990年   4篇
  1989年   4篇
  1988年   2篇
  1987年   3篇
  1986年   4篇
  1985年   4篇
  1984年   3篇
  1983年   1篇
  1982年   4篇
  1980年   3篇
  1979年   3篇
  1978年   3篇
  1976年   1篇
  1975年   1篇
  1971年   2篇
排序方式: 共有276条查询结果,搜索用时 312 毫秒
61.
62.
The purpose of this article is to review evidence concerning the joint impact of family characteristics and child care experiences in understanding children's development. Although child care experiences are related to children's development across a variety of domains, family characteristics, particularly socioeconomic status and parenting quality, are typically stronger predictors of children's outcomes. An important implication of these findings is that high-quality child care experiences are likely to have stronger effects on children who are at risk of poorer outcomes because of less optimal family environments; evidence from experimental and nonexperimental studies generally supports this conclusion. From a policy perspective, an important goal for future research is to identify subgroups of families within the heterogeneous low-income population that are in particular need of relatively more intensive services and to develop effective interventions that are tailored to their needs.  相似文献   
63.
Imprecise measures of ovulation obscure the relationship between women's sexuality and the menstrual cycle, as does studying women with different contraceptive goals in different social contexts. Here we present a novel noninvasive method to precisely pinpoint the preovulatory surge of Luteinizing Hormone (LH), demarcating hormonally distinct cycle phases with greater than 95% reliability. Women were more sexually active on days prior to and including the preovulatory (LH) surge. This pattern was evident only when women initiated sexual activity and not when their partners did, indicating an increase in women's sexual motivation rather than attractiveness. A second study replicated the 6-day increase in sexual activity beginning 3 days before the LH surge, accompanied by stronger sexual desire and more sexual fantasies. We propose the term 'sexual phase' of the cycle, since follicular phase is over inclusive and ovulatory phase is not sufficient. These findings are striking because the women were avoiding pregnancy and were kept blind to the hypotheses, preventing expectation bias. The sexual phase was more robust in women with regular sexual partners, although the increase in sexual desire was just as great in nonpartnered women, who also reported feeling less lonely at this time. We use these results to evaluate potential neuroendocrine mechanisms underlying women's sexual motivation and activity.  相似文献   
64.
This paper describes a knowledge representation approach and reasoning implementation in a real-time knowledge-based control system (KBCS) for navigating ships in restricted waters. This shipboard piloting expert system (SPES) is being developed as an intelligent node in Sperry Marine's ExxBridge integrated ship's bridge system (IBS) for Exxon Shipping Company tankers. The SPES is intended to provide decision support to ships' navigation officers while piloting large vessels in restricted waters, and to reduce the information overload under which they labor, by incorporating local, transit-specific, and shiphandling knowledge, and by providing requisite decision support in a timely fashion. As such, the system provides decision support to (1) senior ships' pilots training junior pilots; (2) ships' masters training junior deck officers in the essentials of good piloting and shiphandling; and (3) watchstanding deck officers utilizing the system's on-line reminder and assist capabilities, or off-line simulation and contingency planning functionality.  相似文献   
65.
Emotional Connection (EC) measured by the Welch Emotional Connection Screen (WECS) was related to the Parent–Infant Interaction Rating System (PIIRS), a 5‐point adaptation of the rating system developed for the National Institute of Child Health and Human Development Study of Early Child Care and Youth Development (e.g., NICHD Early Child Care Research Network, 1999, Developmental Psychology, 35, 1399). Parent–infant dyads (n = 49 mothers; 43 fathers) were videotaped during face‐to‐face interaction at infant age 6 months; interactions were coded with both the WECS and PIIRS. At age 3, mothers completed the Child Behavior Checklist. WECS ratings of EC were associated with PIIRS rating items for both mother–infant and father–infant dyads. Mother–infant EC related positively to maternal sensitivity and positive regard for child, child positive mood and sustained attention, and dyadic mutuality, and negatively with maternal intrusiveness. Father–infant EC related positively to fathers' positive regard for child, child positive mood and sustained attention, and dyadic mutuality. Mother–infant EC predicted child behavior problems at age 3 better than mother–infant PIIRS ratings of dyadic mutuality. With fathers, neither EC nor dyadic mutuality ratings predicted mother‐reported child behavior problems. Findings highlight the practical utility of the WECS for identifying potentially at‐risk dyads and supporting early relational health.  相似文献   
66.
The authors examined the relations among intimate partner violence (IPV), maternal depressive symptoms, and maternal harsh intrusive parenting. Using a cross‐lagged, autoregressive path model, they sought to clarify the directionality of the relations among these 3 variables over the first 2 years of the child's life. The results indicated that, in this diverse sample of families living in predominantly low‐income rural communities (N = 705), higher levels of early IPV were associated with increases in maternal depressive symptoms, which in turn were associated with increases in maternal harsh intrusive parenting behaviors. These findings suggest that interventions aimed at improving the parenting of women exposed to domestic violence may want to simultaneously target IPV and depressive symptomatology.  相似文献   
67.
Research on Chinese Americans often centers on successful economic incorporation in American society (e.g., “model minority”). Unfortunately, previous research has overlooked the changing economic circumstances of native- and foreign-born Chinese children, despite the fact that Chinese children living in America are diverse in socioeconomic status and geographic origin. In this paper, we use data from the 1990 and 2000 censuses to compare levels and changes in child poverty rates among U.S.-born Chinese and immigrants from Taiwan, Mainland China, and Hong Kong, and to investigate how changes in maternal employment and family structure (including cohabitation) contributed to the decline in poverty rates in the 1990s. Compared to other Asian Americans and non-Asians, Chinese children in the U.S. are less likely to live in poverty, thanks in part to more married-couple families and higher levels of maternal employment. Yet, child poverty rates vary among Chinese American subpopulations—being lowest for children of U.S.-born Chinese and highest for children of mainland-born Chinese. In addition, we find that poverty among U.S.-born and Taiwan-born Chinese would have been even lower had their rates of divorce and cohabitation had been similar to those for mainland-born and Hong Kong-born Chinese.  相似文献   
68.
A major effort is under way nationally to shift long-term care services from institutional to home- and community-based settings. This article employs quantitative and qualitative methods to identify unmet needs of consumers who transition from a statewide home- and community-based service program for older adults to long-term nursing home residence. Administrative data, care manager notes, and focus group discussions identified program service gaps that inadequately accommodated acute health problems, mental health issues, and stressed family caregivers; additional unmet needs highlighted an inadequate workforce, transportation barriers, and limited supportive housing options. National and state-level policy implications are considered.  相似文献   
69.
This paper presents an analysis of cognitive-ergonomic aspects of e-learning courses, offered by an organism from Brazilian Public Administration. The Cognitive Ergonomic studies conductive and cognitive aspects concerning to the relation between human, physics elements and social elements of the work space. From that usability aspects were evaluated by these points: i) visualization; ii) text comprehension lecture; iii) memory; iv) interface; v) instructional design; and vi) attention and learning. That survey is characterized as having been applied using the following techniques: (1) bibliographic survey, (2) field survey and (3) analysis of the documents. It was chosen the semi-structured questionnaire as the main method of data collection. About the interacting with artifacts, the interface of the courses is classified as direct engagement, because it allows the user to get the feeling that acts directly on the objects. Although the courses are well-structured they have flaws that will be discussed below. Even with these problems, the courses have a good degree of usability.  相似文献   
70.
This project presents an analysis of the ergonomic conditions of three types of mattress and three types of pillow. The products are manufactured by a Colombian company which specializes in flexible polyurethane foam and other products designed for rest and relaxation. The project was developed through the University - Industry relationship: a strategic partnership based on the knowledge and strengths of each component. The conceptual theories that underpin the Ergonomics Research Division of the Design Studies Research Group (GED) provided the methodological approach for the project: the characteristics, the requirements and the relationships that are established between the components that constitute the User - Product - Context system (basic principles of the Ergonomics - Design relationship). An important factor in the project was the conception and measurement of comfort. Comfort can be measured on an objective level (quantitative measurement), and on a subjective level (a user's particular perceptions and tastes). What constitutes 'comfort' can vary from person to person, thus making the identification of criteria for the standardization of consumer products problematic. This project enabled design recommendations to be made to the Company vis-à-vis future proposals for mattress and pillow products. This experience of applied research was carried out by professors and students from the Faculty of Industrial Design at the UPB in Medellín, Colombia.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号