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   222篇
  免费   18篇
管理学   23篇
民族学   1篇
人口学   15篇
理论方法论   36篇
综合类   1篇
社会学   137篇
统计学   27篇
  2024年   1篇
  2023年   5篇
  2022年   2篇
  2021年   4篇
  2020年   4篇
  2019年   16篇
  2018年   10篇
  2017年   16篇
  2016年   17篇
  2015年   5篇
  2014年   7篇
  2013年   46篇
  2012年   10篇
  2011年   13篇
  2010年   8篇
  2009年   6篇
  2008年   11篇
  2007年   8篇
  2006年   9篇
  2005年   5篇
  2004年   6篇
  2003年   2篇
  2002年   3篇
  2001年   2篇
  2000年   2篇
  1998年   1篇
  1997年   4篇
  1996年   7篇
  1995年   1篇
  1994年   2篇
  1993年   1篇
  1987年   1篇
  1979年   2篇
  1977年   2篇
  1974年   1篇
排序方式: 共有240条查询结果,搜索用时 359 毫秒
61.
Conclusions The data presented in this paper and the earlier one in this series suggest that the effects of special comprehensive programs for school age mothers are seen most clearly in delay of the first pregnancy subsequent to the programs, as originally indicated by Klerman and Jekel (1973). Rather than terminating childbearing after the second pregnancy, those young mothers who had one subsequent pregnancy usually went on to become pregnant again rather quickly.A question can be raised about the generalizability of the finding from this study which is based on a rather small, black, poverty-lever sample. Although Furstenberg's (1976) results support those of this report in a population with similar characteristics, additional studies of white and non-poverty populations receiving a variety of services are critically needed if the country is to understand the phenomenon of adolescent pregnancy and find effective ways of minimizing its consequences.This study was supported by Grant #MC-R-090357 from the Maternal and Child Health Service, Public Health Service, Dept. of Health, Education and Welfare.  相似文献   
62.
Because of their mouthing behaviors, children have a higher potential for exposure to available chemicals through the nondietary ingestion route; thus, frequency of hand-to-mouth activity is an important variable for exposure assessments. Such data are limited and difficult to collect. Few published studies report such information, and the studies that have been conducted used different data collection approaches (e.g., videography versus real-time observation), data analysis and reporting methods, ages of children, locations, and even definitions of "mouthing." For this article, hand-to-mouth frequency data were gathered from 9 available studies representing 429 subjects and more than 2,000 hours of behavior observation. A meta-analysis was conducted to study differences in hand-to-mouth frequency based on study, age group, gender, and location (indoor vs. outdoor), to fit variability and uncertainty distributions that can be used in probabilistic exposure assessments, and to identify any data gaps. Results of this analysis indicate that age and location are important for hand-to-mouth frequency, but study and gender are not. As age increases, both indoor and outdoor hand-to-mouth frequencies decrease. Hand-to-mouth behavior is significantly greater indoors than outdoors. For both indoor and outdoor hand-to-mouth frequencies, interpersonal, and intra-personal variability are approximately 60% and approximately 30%, respectively. The variance difference among different studies is much bigger than its mean, indicating that different studies with different methodologies have similar central values. Weibull distributions best fit the observed data for the different variables considered and are presented in this article by study, age group, and location. Average indoor hand-to-mouth behavior ranged from 6.7 to 28.0 contacts/hour, with the lowest value corresponding to the 6 to <11 year olds and the highest value corresponding to the 3 to <6 month olds. Average outdoor hand-to-mouth frequency ranged from 2.9 to 14.5 contacts/hour, with the lowest value corresponding to the 6 to <11 year olds and the highest value corresponding to the 6 to <12 month olds. The analysis highlights the need for additional hand-to-mouth data for the <3 months, 3 to <6 months, and 3 to <6 year age groups using standardized collection and analysis because of lack of data or high uncertainty in available data. This is the first publication to report Weibull distributions as the best fitting distribution for hand-to-mouth frequency; using the best fitting exposure factor distribution will help improve estimates of exposure. The analyses also represent a first comprehensive effort to fit hand-to-mouth frequency variability and uncertainty distributions by indoor/outdoor location and by age groups, using the new standard set of age groups recommended by the U.S. Environmental Protection Agency for assessing childhood exposures. Thus, the data presented in this article can be used to update the U.S. EPA's Child-Specific Exposure Factors Handbook and to improve estimates of nondietary ingestion in probabilistic exposure modeling.  相似文献   
63.
The negative effects of incarceration on child well-being are often linked to the economic insecurity of formerly incarcerated parents. Researchers caution, however, that the effects of parental incarceration may be small in the presence of multiple-partner fertility and other family complexity. Despite these claims, few studies have directly observed either economic insecurity or the full extent of family complexity. We study parent-child relationships with a unique data set that includes detailed information about economic insecurity and family complexity among parents just released from prison. We find that stable private housing, more than income, is associated with close and regular contact between parents and children. Formerly incarcerated parents see their children less regularly in contexts of multiple-partner fertility and in the absence of supportive family relationships. Significant housing and family effects are estimated even after we control for drug use and crime, which are themselves negatively related to parental contact. The findings point to the constraints of material insecurity and the complexity of family relationships on the contact between formerly incarcerated parents and their children.  相似文献   
64.
65.
66.
In this study the researchers examined the knowledge, skills, and use of Evidence-Based Practice in a sample of social workers from different practice settings. Using an electronic survey, data were collected from a group of social work practitioners (N = 200). Participants in their 30s and 40s demonstrated the most knowledge and use of Evidence-Based Practice. In addition, a high percentage of social workers reported to be knowledgeable about social work research databases; a smaller percentage actually used online resources in their practice. Through this study the researchers add to what is currently known about social workers' perceptions, knowledge, and use of Evidence-Based Practice.  相似文献   
67.
Deadlines have always played a significant role in the practice of public relations, especially the media relations specialization. Public relations textbooks and practitioner handbooks encourage budding practitioners to learn how and when journalists, broadcasters, and Internet authors work so that they may pitch story ideas to them appropriately. Even though media catching, an emerging trend in media relations, reverses the traditional direction of story pitching, deadlines are still critical for this new media relations approach. Through a content analysis of 2802 Help-A-Reporter-Out media requests, this study examines how deadlines vary among media outlets engaging in this new media relations story. Statistically significant differences provide insights for public relations practitioners as to how they can best utilize the service to compete for media placements.  相似文献   
68.
The language of consumerism suggests that through involvement in consumer processes, consumers can influence policy formation and service provision. This paper examines, as illustrative cases in Australia, how two groups of consumers, people with a mental illness and older people, engage with these consumer processes. It finds they critically evaluate the opportunity offered by consumer processes for inclusion in policy and programmes. Both people with a mental illness and interviewed older people indicated how they acted as "agents involved in interpreting their needs", despite finding that in consumer processes their needs were predefined. Rather than allowing themselves to be constructed as passive objects, they positioned themselves as active citizens, having agency not as individual consumers but through drawing on networks. The responses of both groups go some distance toward dismantling power differences between professionals and "consumers", suggesting that social policy and programmes for both people with mental illness and older people can and sometimes do develop in a context of greater inclusivity.  相似文献   
69.
This article reports on a training program for group home supervisors that was designed to utilize positive youth development principles in work with youth transitioning from care to independent living. Over a period of 5 months, eight one-day training sessions took place across one state in the U.S. (Massachusetts) with a total of 186 group care staff in attendance. The evaluation consisted of three components: observation of participant feedback during training, training day post-test, and follow-up with participants 2–3 months after training. Implications of the data, particularly barriers to implementation of training programs, are discussed.  相似文献   
70.
Social scientists perform a multi-functional role as researcher, teacher and expert. The academic conference provides an opportunity for all these roles to be engaged and as such is a political and social site where meaning is debated and new research born. The conference is also attractive to journalists as news fodder. This article considers the relationship between journalists and social scientific organizations in the context of a professional conference and seeks to explain the tensions that exist. It concludes that the two cultures of journalist and academic are in conflict where they converge.  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