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   622篇
  免费   15篇
各国政治   12篇
工人农民   70篇
世界政治   125篇
外交国际关系   25篇
法律   315篇
中国政治   8篇
政治理论   80篇
综合类   2篇
  2020年   4篇
  2019年   5篇
  2018年   18篇
  2017年   19篇
  2016年   29篇
  2015年   17篇
  2014年   15篇
  2013年   64篇
  2012年   20篇
  2011年   16篇
  2010年   19篇
  2009年   18篇
  2008年   27篇
  2007年   34篇
  2006年   31篇
  2005年   34篇
  2004年   16篇
  2003年   23篇
  2002年   36篇
  2001年   8篇
  2000年   8篇
  1999年   13篇
  1998年   12篇
  1997年   5篇
  1996年   6篇
  1995年   6篇
  1994年   8篇
  1993年   12篇
  1992年   10篇
  1991年   8篇
  1990年   6篇
  1989年   6篇
  1988年   6篇
  1987年   10篇
  1986年   9篇
  1985年   9篇
  1984年   6篇
  1983年   5篇
  1982年   5篇
  1981年   6篇
  1980年   3篇
  1979年   2篇
  1978年   5篇
  1977年   4篇
  1976年   2篇
  1974年   4篇
  1972年   3篇
  1970年   1篇
  1967年   1篇
  1943年   1篇
排序方式: 共有637条查询结果,搜索用时 15 毫秒
631.
This qualitative meta-synthesis of materials from three national projects that had examined more than 75 American Indian/Alaska Native child welfare programs sought to articulate how culture is expressed within tribal child protective services (CPS)work and to uncover whether there are cultural elements of tribal child welfare practice that are distinct from practice in non-tribal settings. Through the meta-synthesis, a framework emerged outlining a cultural approach to practice that incorporates: (a) a culturally-distinct definition of Native child well-being; (b) tribal values that form a foundation for practice; (c) practice intentions linking child protection with cultural and community health; and (d) two specialized worker skills.  相似文献   
632.
This study examined subjective age (how old one feels) and associated variables in 148 emerging adults, ages 20–30 years. Seventy-six participants had a motor disability (cerebral palsy, spina bifida) and 72 had no motor disability. Participants completed questionnaires and were interviewed. There was no significant difference in subjective age between groups. Consistent with previous research, chronological and subjective ages were significantly negatively related in participants without motor disabilities. Chronological and subjective ages were unrelated in the group with motor disabilities but higher psychosocial maturity was related to an older subjective age. Perceptions of how much parents fostered autonomy did not predict subjective age in either group. In both groups, individuals whose parents treated them as younger reported feeling younger. Number of role transitions did not predict subjective age. The results highlight the importance of exploring motor disabilities as a source of diversity in the subjective ages of young people during the transition to adulthood.
Nancy L. GalambosEmail:
  相似文献   
633.
A 10-year review of records of the King County Medical Examiner's Office found 87 deaths due to necrotizing fasciitis and related necrotizing soft tissue infections. In 64 of these cases there were sufficient details to provide an analysis of the manifestations, microbiology, and source of infection. One half (32) of the cases were due to injection of black tar heroin, the nearly exclusive form of heroin in the Northwest United States. Of those due to black tar injection, 24 were clostridial infections with various species represented, eight of which were Clostridium sordellii. Of the 32 cases not associated with drug injection, streptococcal species predominated, with Streptococcus pyogenes isolated in 14 cases. Only three of 32 cases not associated with injection drug use were clostridial infections. These differences were statistically significant. Staphylococcus aureus was isolated from 14 cases; two were methicillin-resistant strains. Overall, 28 of the 64 cases were polymicrobial infections, 15 due to black tar injection and 13 not associated with drug injection. This study supports the conclusion that necrotizing fasciitis due to black tar heroin injection is predominantly a clostridial disease, and in this way differs significantly from necrotizing fasciitis due to other causes.  相似文献   
634.
The minimum postmortem interval can be estimated based on knowledge of the pattern of insect succession on a corpse. To use this approach requires that we take into account the rates of insect development associated with particular climatological conditions of the region. This study is the first to look at insect succession on decomposing carcasses in the high altitude plains (Paramo) in Colombia, at 3035 m above sea level. Five stages of decomposition were designated with indicator species identified for each stage: Callíphora nigribasis at the fresh stage; Compsomyiops verena at the bloated stage; Compsomyiops boliviana during active decay; Stearibia nigriceps and Hydrotaea sp. during advanced decay and Leptocera sp. for dry remains. A succession table is presented for carrion-associated species of the region, which can be used for estimating time since death in similar areas. Compsomyiops boliviana is reported for the first time in Colombia.  相似文献   
635.

Objectives

To assess the impact of schools on crime in neighborhoods.

Methods

We utilize data of charter and public schools in Philadelphia to estimate the effect of school openings on neighborhood crime patterns between 1998 and 2010. We estimate the change in crime in areas surrounding schools before and after their opening compared to areas where schools were always open with Poisson regression models. We also estimate changes in crime in census tracts as schools are added compared to census tracts that never had schools. Finally, we compare estimates from Poisson regression models to those derived from permutation tests where schools are randomly assigned different opening dates.

Results

We find no evidence that school openings increase crime relative to locations where schools were always open or never had schools. The models generally produce null effects, though there is some evidence for a reduction in property crimes for public school openings and a reduction in violent crimes for charter school openings within certain distances. Estimates at the census tract level show that changes in the number of schools are not associated with any changes in crime relative to tracts with no schools.

Conclusions

Contrary to a large theoretical and empirical literature, the results suggest that school locations play a minimal role in neighborhood crime production in Philadelphia. Future research should investigate specific contexts and mechanisms, such as land-use characteristics and travel patterns to schools, which may interact with specific school settings in ways that are related to crime production.
  相似文献   
636.
Located within a context of widespread change social work professionals are required to navigate tensions between organisational imperatives and developing effective relationships with families. Achieving effective partnership working is premised on the development of relational ways of working where trust is formed through co-creation. The recent emergence of 'Fast-track' approaches in education and training reflects a shift away from developing skills in critical/analytical reflection, towards an employer-led approach that prioritises the need for 'ready practitioners'. Simultaneously there has been change in the family justice system, culminating in the Children and Families Act 2014 and the 26-week time frame for the completion of care cases. This paper explores current contradictions within social work practice. Pivotal is defining the role of social work within a contemporary English jurisdiction. Adopting deeper relational ways of working with families may help to define the boundaries of a profession that appears to have lost its identity. Rather than facing the prospect that the door is closed on the possibility of reclaiming practice that prioritises and values professional judgement and discretion, this paper reflects upon some positive examples of relational work with families by social workers within different sectors of practice.  相似文献   
637.

Objectives

We highlight the importance of documenting the step-by-step processes used for the selection of comparison areas when evaluating a community-level intervention that targets a large-scale community.

Methods

We demonstrate the proposed method using a propensity score matching framework for an impact analysis of the Cure Violence Public Health Model in Philadelphia. To select comparison communities, propensity score models are run using different levels of aggregation to define the intervention site. We discuss the trade-offs made.

Results

We find wide variation in documentation and explanation in the extant literature of the methods used to select comparison communities. The size of the unit of analysis at which a community is measured complicates the decision processes, and in turn, can affect the validity of the counterfactual.

Conclusions

It is important to carefully consider the unit of analysis for measurement of comparison communities. Assessing the geographic clustering of matched communities to mirror that of the treated community holds conceptual appeal and represents a strategy to consider when evaluating community-level interventions taking place at a large scale. Regardless of the final decisions made in the selection of the counterfactual, the field could benefit from more systematic diagnostic tools that document and guide the steps and decisions along the way, and ask: “could there have been another way of doing each step, and what difference would this have made?” Overall, across community-level evaluations that utilize quasi-experimental designs, documentation of the counterfactual selection process will provide a more fine-grained understanding of causal inference.
  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