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   3519篇
  免费   130篇
  2022年   18篇
  2021年   19篇
  2020年   40篇
  2019年   57篇
  2018年   83篇
  2017年   78篇
  2016年   94篇
  2015年   81篇
  2014年   83篇
  2013年   359篇
  2012年   159篇
  2011年   154篇
  2010年   125篇
  2009年   108篇
  2008年   155篇
  2007年   184篇
  2006年   144篇
  2005年   120篇
  2004年   117篇
  2003年   133篇
  2002年   140篇
  2001年   66篇
  2000年   50篇
  1999年   69篇
  1998年   62篇
  1997年   54篇
  1996年   60篇
  1995年   40篇
  1994年   43篇
  1993年   43篇
  1992年   54篇
  1991年   43篇
  1990年   49篇
  1989年   35篇
  1988年   30篇
  1987年   32篇
  1986年   36篇
  1985年   38篇
  1984年   50篇
  1983年   36篇
  1982年   50篇
  1981年   39篇
  1980年   32篇
  1979年   31篇
  1978年   20篇
  1977年   29篇
  1976年   26篇
  1975年   14篇
  1974年   17篇
  1973年   14篇
排序方式: 共有3649条查询结果,搜索用时 15 毫秒
281.
Study goals were to examine the conditions under which congruent and incongruent patterns of parents’ division of household labor and gender role attitudes emerged, and the implications of these patterns for youth gender development. Questionnaire and phone diary data were collected from mothers, fathers, and youths from 236 Mexican American families living in the southwestern US. Preliminary cluster analysis identified three patterns: Traditional divisions of labor and traditional attitudes, egalitarian divisions of labor and egalitarian attitudes, and an incongruent pattern, with a traditional division of labor but egalitarian attitudes. MANOVAs, and follow-up, mixed- and between-group ANOVAs, revealed that these groups of families differed in parents’ time constraints, socioeconomic resources, and cultural orientations. Mothers in the congruent egalitarian group worked more hours and earned higher incomes as compared to mothers in the congruent traditional and incongruent groups, and the emergence of the incongruent group was grounded in within-family, interparental differences in work hours and incomes. Parents’ patterns of gendered practices and beliefs were linked to their youths’ housework participation, time with mothers versus fathers, and gender role attitudes. Youths in the congruent traditional group reported more traditional gender role attitudes than did youths in the congruent egalitarian and incongruent groups, and gender atypical housework participation and time with parents were only observed in the congruent egalitarian group. Findings demonstrate the utility of a within-family design to understand complex gendered phenomena, and highlight the multidimensional nature of gender and the importance of contextualizing the study of ethnic minorities.  相似文献   
282.
Preschoolers who explore objects haptically often fail to recognize those objects in subsequent visual tests. This suggests that children may represent qualitatively different information in vision and haptics and/or that children’s haptic perception may be poor. In this study, 72 children (2½-5 years of age) and 20 adults explored unfamiliar objects either haptically or visually and then chose a visual match from among three test objects, each matching the exemplar on one perceptual dimension. All age groups chose shape-based matches after visual exploration. Both 5-year-olds and adults also chose shape-based matches after haptic exploration, but younger children did not match consistently in this condition. Certain hand movements performed by children during haptic exploration reliably predicted shape-based matches but occurred at very low frequencies. Thus, younger children’s difficulties with haptic-to-visual information transfer appeared to stem from their failure to use their hands to obtain reliable haptic information about objects.  相似文献   
283.
The number of HIV-positive Latinas of child-bearing age living on the US–Mexico border is a growing concern. Little is known about how religious beliefs influence the reproductive health decisions of these women in light of disease demands and cultural and religious norms that support high fertility rates and childbearing. Such decisions may be further complicated by the stigma of HIV/AIDS and structural issues related to immigration status and trans-border lives. This paper analyzes extant literature and supports the need for further research so that policy makers and heath and social service providers can develop meaningful and comprehensive reproductive-health related interventions.  相似文献   
284.
The role of sensory awareness in movement control is receiving increasing interest in sports and clinical literature as a feed-forward and feedback mechanism. The aim of the study was to assess the feasibility and effect of training in sensory awareness on dexterity in healthy adults. 29 healthy students were randomly allocated to a single-group, sensory awareness lesson with the dominant hand, the same lesson with the nondominant hand, or to a sham control group. Dexterity measures included the Purdue Pegboard Test, a grip-lift manipulandum, and perceived changes using a questionnaire. The sensory awareness lesson with the dominant hand produced a statistically significant improvement in mean dexterity compared to the control group, but not between the other two pairs of groups. The sensory awareness training paradigm is feasible and a single session improved dexterity in healthy adults.  相似文献   
285.
Evidence suggests that parental marital discord contributes to the development of internalizing and externalizing symptoms in children and adolescents. Few studies, however, have examined the association between parental marital discord and youth’s response to treatment. The present study examined the impact of interparental discord on treatment response in a randomized control trial of adolescents with major depression enrolled in the Treatment for Adolescents with Depression Study (TADS). Participants were 260 adolescents from two-parent households randomly assigned to one of four treatment groups: fluoxetine (FLX), cognitive behavior therapy (CBT), their combination (COMB), or placebo (PBO). Logistic regressions revealed that parental marital discord interacted with youth gender and co-morbid oppositionality symptoms to predict group differences in treatment response.  相似文献   
286.
When target-defining features are specified in advance, attentional target selection in visual search is controlled by preparatory top-down task sets. We used ERP measures to study voluntary target selection in the absence of such feature-specific task sets, and to compare it to selection that is guided by advance knowledge about target features. Visual search arrays contained two different color singleton digits, and participants had to select one of these as target and report its parity. Target color was either known in advance (fixed color task) or had to be selected anew on each trial (free color-choice task). ERP correlates of spatially selective attentional target selection (N2pc) and working memory processing (SPCN) demonstrated rapid target selection and efficient exclusion of color singleton distractors from focal attention and working memory in the fixed color task. In the free color-choice task, spatially selective processing also emerged rapidly, but selection efficiency was reduced, with nontarget singleton digits capturing attention and gaining access to working memory. Results demonstrate the benefits of top-down task sets: Feature-specific advance preparation accelerates target selection, rapidly resolves attentional competition, and prevents irrelevant events from attracting attention and entering working memory.  相似文献   
287.
We use data collected from employees in five transition economies to study whether locus of control and preference for challenge versus affiliation are positively related to worker performance. We find that earnings are positively related to the internal locus of control and preference for challenge among participants of the Armenian and Serbian surveys. In the Russian sample, earnings tend to be higher among workers with a more internal locus of control. Earnings are not systematically related to personality in Kazakhstan and Kyrgyzstan. For most countries, self-reported performance tends to be significantly higher among workers with preference for challenge. Generally, the size of the personality effect on performance is at least as great as the effect of experience or education. Although more research needs to be done before final conclusions about the causes of cross-country differences can be made, we argue that variation in personality effects across countries may be influenced by level of economic development, degree of market-orientation, and cultural diversity.  相似文献   
288.
289.
With the completion of the Human Genome Project and the development of high throughput technologies, such as next-generation sequencing, the use of multiplex genetic testing, in which multiple genes are sequenced simultaneously to test for one or more conditions, is growing rapidly. Reflecting underlying heterogeneity where a broad range of genes confer risks for one or more cancers, the development of genetic cancer panels to assess these risks represents just one example of how multiplex testing is being applied clinically. There are a number of issues and challenges to consider when conducting genetic testing for cancer risk assessment, and these issues become exceedingly more complex when moving from the traditional single-gene approach to panel testing. Here, we address the practical considerations for clinical use of panel testing for breast, ovarian, and colon cancers, including the benefits, limitations and challenges, genetic counseling issues, and management guidelines.  相似文献   
290.
Despite ongoing public calls for reform, the mental health needs of many children with psychological, emotional and behavioral disorders remain unmet. In response, providers continue to seek effective alternatives to institutional treatment by implementing comprehensive systems of care. The Children’s Enhancement Project (CEP) is a collaborative effort to provide holistic, community-based mental health services for children with an individualized, flexible, family-driven approach. We conducted a process evaluation of CEP’s early stage development and implementation utilizing both qualitative stakeholder interviews and quantitative survey components. The current article describes that evaluation and highlights the challenges and potential solutions encountered in developing a system of care. The lessons learned regarding system of care development, including the importance of a shared vision, establishing programmatic guidelines, achieving collaboration, and addressing sustainability concerns, are discussed.  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