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771.
Abstract

Durkheim's theory of the causes of specialization in society proposes that the best performers should come from places with the most competitive interaction. This paper tests this proposition in an arena where interaction is highly competitive and where performance can be objectively measured, organized athletics in the United States. Four state-level indicators of competitive interaction (population, population density, average school size, and racial diversity) are used to predict the number of Olympic athletes developing in each state for the Olympic years 1956, 1968, 1980, and 1992. Net of controls for opportunities in athletics, results show that the number of Olympians developing in states increases exponentially with population, average high school size, and racial homogeneity, as Durkheimian theory suggests. These findings are robust even with controls for unmeasured state differences. I conclude that holding constant opportunity, states with more interaction among athletes produce more of the “best.”  相似文献   
772.
Resumen

Este estudio se dirige a contrastar las diferencias en el comportamiento adaptativo de los sujetos retrasados que son producto de los diferentes contextos en los que éste es emitido. En este caso, el contexto se entiende como los aspectos físicos y sociales del lugar en el que inmediatamente se produce la conducta. Esta perspectiva molecular del contexto ha permitido detectar diferencias en el comportamiento adaptativo en términos de lenguaje receptivo y lenguaje expresivo. La muestra utilizada fueron 71 sujetos evaluados a través del West Virginia assessment and tracking system.  相似文献   
773.
Putting money at stake produces anticipatory uncertainty, a process that has been linked to key features of gambling. Here we examined how learning and individual differences modulate the stimulus preceding negativity (SPN, an electroencephalographic signature of perceived uncertainty of valued outcomes) in gambling disorder patients (GDPs) and healthy controls (HCs), during a non-gambling contingency learning task. Twenty-four GDPs and 26 HCs performed a causal learning task under conditions of high and medium uncertainty (HU, MU; null and positive cue-outcome contingency, respectively). Participants were asked to predict the outcome trial-by-trial, and to regularly judge the strength of the cue-outcome contingency. A pre-outcome SPN was extracted from simultaneous electroencephalographic recordings for each participant, uncertainty level, and task block. The two groups similarly learnt to predict the occurrence of the outcome in the presence/absence of the cue. In HCs, SPN amplitude decreased as the outcome became predictable in the MU condition, a decrement that was absent in the HU condition, where the outcome remained unpredictable during the task. Most importantly, GDPs’ SPN remained high and insensitive to task type and block. In GDPs, the SPN amplitude was linked to gambling preferences. When both groups were considered together, SPN amplitude was also related to impulsivity. GDPs thus showed an abnormal electrophysiological response to outcome uncertainty, not attributable to faulty contingency learning. Differences with controls were larger in frequent players of passive games, and smaller in players of more active games. Potential psychological mechanisms underlying this set of effects are discussed.  相似文献   
774.
Changes in the costs of trading inputs or final goods affect establishment‐level job flows. Using a longitudinal database containing the universe of manufacturing establishments in California from 1992 to 2004, we find that a decline in input or final‐good trade costs is associated with job destruction in the least productive establishments, job creation in the most productive establishments, and an increase in the death likelihood of the least productive establishments. The evidence is consistent with predictions of models of trade with heterogeneous firms. Additionally, the evidence shows that the effects of input trade costs on establishment‐level job flows are larger than the effects of final‐good trade costs. (JEL F14, F16)  相似文献   
775.
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777.
ABSTRACT

Home visitation programs to prevent child maltreatment are offered in many communities. Agencies in these communities want to help families in need while under increased pressure to provide effective services. Funding is limited and competitive; some agencies might choose to limit funds spent on supervision, training, and evaluation as a way to provide more direct service. In this article, we use an implementation science framework and the results of an evaluation of a small home visitation program to underscore the importance of ongoing training and supervision, attention to fidelity, and program evaluation. The evaluation included 17 families entering the program during 21 months. Evaluators visited families in their homes at the beginning of the program and again 10 months later. Like many other well-intended, small-scale programs, this one “borrowed” from evidence-based models and expanded enrollment criteria in an attempt to better serve families. Findings from the evaluation suggest that the program, as it was carried out, was not effective at reducing parenting behaviors known to be associated with child maltreatment. We offer advice to funding and community agencies based on these findings and implementation science. Future evaluation research must pay greater attention to fidelity and implementation.  相似文献   
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779.
Current family therapy theories and practices of domestic violence place an important emphasis on gender. Employing the notion of intersectionality, this article demonstrates how the relevance and applicability of contemporary theories and practices may be enhanced through the inclusion of primary dimensions of social life, including but not limited to race, class, and sexual orientation. Theoretical in nature, this article suggests future directions for theory construction and clinical practice, drawing on literature not easily accessible to most marital and family therapists.  相似文献   
780.
The results of an uncontrolled study of Gottman Method Couples Therapy in changing relationship satisfaction with 106 gay and lesbian couples is reported in this paper. Measurement of relationship satisfaction was conducted at five separate time points. The data show significant improvements in relationship satisfaction following eleven sessions of therapy for both gay male and lesbian couples. Effect sizes suggest that this therapy was highly effective, compared to the usual 0.5 standard deviation effect size in couples therapy. Initial co‐morbidities did not affect the size of the changes; in fact, some changes were significantly larger for three initial co‐morbidities.  相似文献   
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