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   1741篇
  免费   60篇
管理学   131篇
民族学   11篇
人口学   198篇
丛书文集   3篇
理论方法论   237篇
综合类   13篇
社会学   1078篇
统计学   130篇
  2024年   3篇
  2023年   10篇
  2022年   5篇
  2021年   8篇
  2020年   38篇
  2019年   43篇
  2018年   53篇
  2017年   72篇
  2016年   61篇
  2015年   33篇
  2014年   52篇
  2013年   297篇
  2012年   61篇
  2011年   81篇
  2010年   48篇
  2009年   44篇
  2008年   64篇
  2007年   61篇
  2006年   77篇
  2005年   61篇
  2004年   66篇
  2003年   58篇
  2002年   63篇
  2001年   44篇
  2000年   52篇
  1999年   32篇
  1998年   31篇
  1997年   22篇
  1996年   21篇
  1995年   17篇
  1994年   29篇
  1993年   17篇
  1992年   22篇
  1991年   13篇
  1990年   14篇
  1989年   14篇
  1988年   10篇
  1987年   11篇
  1986年   9篇
  1985年   13篇
  1984年   16篇
  1983年   9篇
  1982年   6篇
  1981年   4篇
  1980年   8篇
  1979年   6篇
  1978年   4篇
  1977年   3篇
  1972年   2篇
  1971年   3篇
排序方式: 共有1801条查询结果,搜索用时 62 毫秒
991.
Prevention researchers and school personnel lack a common understanding concerning the opportunities and burdens of school-based drug prevention research. In this article, we review issues related to researching substance abuse prevention programs in school settings, and assess challenges related to recruitment, communication, research design, surveying, and ensuring program fidelity. We conclude that before any school is enrolled, there must be a mutual understanding as to the nature and extent of the study's requirements and what adjustments a school will have to make to support a successful collaboration. Further, researchers must understand that schools' responsibilities for preparing students to perform well on academic and standardized tests will always overshadow the value they place on participating in studies to evaluate the effectiveness of prevention curricula.  相似文献   
992.
In response to a series of national policy reports regarding what has been termed the "quality chasm" in health and mental health care in the United States, in January 2003, the American Association for Marriage and Family Therapy convened a task force to develop core competencies (CC) for the practice of marriage and family therapy (MFT). The task force also was responding to a call for outcome-based education and for the need to answer questions about what marriage and family therapists do. Development of the CC moves the field of MFT into a leading-edge position in mental health. This article describes the development of the CC, outcomes of the development process for the competencies, and recommendations for their continued development and implementation.  相似文献   
993.
Child abuse and violence are significant public health problems. Research indicates a strong correlation between early childhood abuse and enduring neurobiological changes in specific regions of the brain. These neurobiological changes are often reflected in psychopathology and lifelong maladaptive behaviors. However, emerging research suggests that these neurobiological changes may be modified through specific evidence-based interventions. Nurses must be able to evaluate the current research and translate the findings into their practice, remembering that prevention is the most effective remedy for abuse and violence.  相似文献   
994.
Sexual activity is normative in college. Thus, college students who are virgins are a minority; they are also an understudied group. This study extended a prior investigation (Sprecher &; Regan, 1996 Sprecher, S., &; Regan, P. C. (1996). College virgins: How men and women perceive their sexual status. Journal of Sex Research, 33, 315.[Taylor &; Francis Online], [Web of Science ®] [Google Scholar]) that focused on U.S. college virgins' reported reasons for and reactions to virginity. Data were collected from the same university over an additional 18 years and from more than 700 additional virgin students. We found differences between male and female virgins that showed that men are more reluctant virgins. For example, the only reason for being a virgin that male virgins endorsed to a greater degree than did female virgins was “my partner was not willing.” Men also had more negative affective reactions to being a virgin than did women. We also found some variation in reasons for and reactions to virginity based on sociodemographic variables such as religiosity and ethnicity. A temporal analysis revealed that reasons for being a virgin that referred to a fear (e.g., fear of AIDS and other sexually transmitted infections) became less important over the 23-year period. We discuss our findings in the frameworks of evolutionary and social exchange theories.  相似文献   
995.
In a clinical trial comparing two treatment groups, one commonly‐used endpoint is time to death. Another is time until the first nonfatal event (if there is one) or until death (if not). Both endpoints have drawbacks. The wrong choice may adversely affect the value of the study by impairing power if deaths are too few (with the first endpoint) or by lessening the role of mortality if not (with the second endpoint). We propose a compromise that provides a simple test based on the time to death if the patient has died or time since randomization augmented by an increment otherwise. The test applies the ordinary two‐sample Wilcoxon statistic to these values. The formula for the increment (the same for experimental and control patients) must be specified before the trial starts. In the simplest (and perhaps most useful) case, the increment assumes only two values, according to whether or not the (surviving) patient had a nonfatal event. More generally, the increment depends on the time of the first nonfatal event, if any, and the time since randomization. The test has correct Type I error even though it does not handle censoring in a customary way. For conditions where investigators would face no easy (advance) choice between the two older tests, simulation results favor the new test. An example using a renal‐cancer trial is presented. Copyright © 2015 John Wiley & Sons, Ltd.  相似文献   
996.
This article presents findings from a focused scoping review of the published literature on self-directed support (SDS), the term adopted by the Scottish Government to refer to its policy to improve social care outcomes and choices for people using publicly funded services and to distinguish it from personalisation, the term more commonly used in England, and from consumer-directed-care and cash for counselling. The review was undertaken to inform an evaluation of the early adopters of SDS, funded by the Scottish Government 2009–2011, and was updated with later literature. It focused on the evidence base available to inform the Test Sites' (pilot local authorities) efforts to reduce bureaucracy or ‘red tape’ for people choosing their own social care and support; the available evidence about leadership and training to support these changes and about the use of specific transitional funding to ease the process of implementation. The findings of the literature review around these three themes are presented and discussed. The article concludes with a discussion of the potential for such focused literature reviews to inform policy-makers, researchers, and social work practitioners across Europe of the options available when seeking to combine rapid yet rigorous approaches to evidence.  相似文献   
997.
Case A  Paxson C 《Demography》2011,48(2):675-697
We document the impact of the AIDS crisis on non-AIDS-related health services in 14 sub-Saharan African countries. Using multiple waves of Demographic and Health Surveys (DHS) for each country, we examine antenatal care, birth deliveries, and rates of immunization for children born between 1988 and 2005. We find deterioration in nearly all these dimensions of health care over this period. The most recent DHS survey for each country collected data on HIV prevalence, which allows us to examine the association between HIV burden and health care. We find that erosion of health services is the largest in regions that have developed the highest rates of HIV. Regions of countries that have light AIDS burdens have witnessed small or no declines in health care, using the measures noted above, while those regions shouldering the heaviest burdens have seen the largest erosion in non-HIV-related health services for pregnant women and children. Using semiparametric techniques, we can date the beginning of the divergence in the use of antenatal care and in children’s immunizations between high- and low-HIV regions to the mid-1990s.  相似文献   
998.
Analysis of a sample of 2084 child abuse referrals to the NSPCC Child Protection Helpline showed that in 10% a parent or carer was reported as having a mental health problem. Mothers were the parent affected in the majority of these cases. The mental health sample differed from the other referrals in an increased concern about emotional abuse and less about sexual abuse; greater levels of violence and discord between parents; and more agency involvement. Issues of potential labelling and therapeutic needs are discussed. Copyright © 1999 John Wiley & Sons, Ltd.  相似文献   
999.
Emerging group technologies are attracting attention from researchers and practitioners for the benefits they potentially offer in terms of communications, productivity, and decision-making capabilities within an organization. To date, research in this area has focused on process or outcome variables, substantively ignoring organizational context issues. This paper reports on a field study that investigated users' perceptions of the impact of group support systems on power and influence within the organization. The study was conducted within a division of a major U.S. software company specializing in the development of business software tools for desktop PCs. Fifteen purposively selected managers and nonmanagers, spanning diverse functional areas, were extensively interviewed for this study. Evidence gathered suggested that group support systems are perceived to exert an equalizing force on power and influence by (1) increasing participation in the decision-making process, (2) improving access to information, (3) improving access to persons, (4) reducing the “power distance” to key individuals, and (5) providing increased opportunities to influence the opinions of others. These results provide a basis for future studies that will attempt to clarify the relationships between organizational context and group technology usage.  相似文献   
1000.
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