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   577篇
  免费   26篇
各国政治   52篇
工人农民   39篇
世界政治   62篇
外交国际关系   20篇
法律   239篇
中国政治   7篇
政治理论   181篇
综合类   3篇
  2023年   4篇
  2022年   4篇
  2021年   8篇
  2020年   10篇
  2019年   11篇
  2018年   28篇
  2017年   19篇
  2016年   26篇
  2015年   6篇
  2014年   10篇
  2013年   90篇
  2012年   12篇
  2011年   15篇
  2010年   17篇
  2009年   10篇
  2008年   18篇
  2007年   23篇
  2006年   23篇
  2005年   11篇
  2004年   11篇
  2003年   18篇
  2002年   14篇
  2001年   6篇
  2000年   13篇
  1999年   7篇
  1998年   8篇
  1997年   7篇
  1995年   5篇
  1994年   8篇
  1993年   6篇
  1992年   10篇
  1991年   5篇
  1990年   8篇
  1989年   6篇
  1987年   6篇
  1986年   5篇
  1985年   15篇
  1984年   4篇
  1983年   9篇
  1982年   12篇
  1981年   7篇
  1980年   4篇
  1979年   8篇
  1977年   5篇
  1973年   8篇
  1970年   4篇
  1968年   5篇
  1966年   5篇
  1965年   3篇
  1943年   3篇
排序方式: 共有603条查询结果,搜索用时 15 毫秒
501.
Over the past 5 years, a great deal of attention has been paid to the development of early warning systems for dropout prevention. These warning systems use a set of indicators based on official school records to identify youth at risk for dropout and then appropriately target intervention. The current study builds on this work by assessing the extent to which a school disengagement warning index predicts not only dropout but also other problem behaviors during middle adolescence, late adolescence, and early adulthood. Data from the Rochester Youth Development Study (N = 911, 73% male, 68% African American, and 17% Latino) were used to examine the effects of a school disengagement warning index based on official 8th and 9th grade school records on subsequent dropout, as well as serious delinquency, official offending, and problem substance use during middle adolescence, late adolescence, and early adulthood. Results indicate that the school disengagement warning index is robustly related to dropout as well as serious problem behaviors across the three developmental stages, even after controlling for important potential confounders. High school dropout mediates the effect of the warning index on serious problem behaviors in early adulthood.  相似文献   
502.
Legal directives – whether laws, regulations, or contractual provisions – can be written along a spectrum of specificity, about which behavioral and legal scholarship present conflicting views. We hypothesized that the combination of specificity and monitoring promotes compliance but harms performance and trust, whereas the combination of specificity and good faith enhances both the informative goal‐setting aspects of specificity and people's sense of commitment. To test these hypotheses, we used a 2x2x2 experimental design in which participants were instructed to edit a document with either general or detailed instructions, with a reference to good faith or without it, and with a review of the work or without it. Participants could engage in various levels and kinds of editing, allowing us to distinctly measure both compliance and performance. When participants require information and guidance, as in the case of editing, we found that specificity increases performance relative to the vague standard condition. We discuss the characteristics of the regulatory frameworks in which our findings are especially relevant.  相似文献   
503.
Feminist Legal Studies - Despite apparent political concern and action—often fuelled by high-profile cases and campaigns—legislative and institutional responses to image-based sexual...  相似文献   
504.
In this study, we have proposed a novel solvent-based method using a specific concentration of 3M™ Novec™ HFE-72DE and 7200 solvents to untangle duct tape from porous article with minimal impact to the quality of latent fingerprint deposited on the sticky-side surface of duct tape. A series of experiments determined that a mixture of 30% HFE-72DE:7200 (v/v) was found to be the most effective to separate various brands of duct tape from different types of porous surface, including office copy paper, newspaper, cardboard, and tissue wipe, which had been stored for up to 30 days before untangling. Further studies also revealed that 30% HFE-72DE:7200 was compatible with three common fingerprint development methods for porous articles, namely ninhydrin, indanedione-zinc, and physical developer. The nonflammability and low toxicity nature of this novel solvent mixture also make it ideal for separating duct tape from porous surface in laboratory or at crime scene.  相似文献   
505.
506.
This article revisits the debate, hosted by this journal in the 1990s, on whether the Provisional IRA campaign was sectarian. In the light of current debates about how Northern Ireland deals with its past, it challenges the analysis that emphasises the non-sectarian ideology of republicanism and ignores the effects of IRA violence. It uses research on the IRA campaign in Fermanagh and south Tyrone to argue that the campaign was unavoidably sectarian but rejects current attempts to label it a form of “ethnic cleansing.”  相似文献   
507.
In sub-Saharan Africa, 72 per cent of urban and 98 per cent of rural households use fuelwood for energy. In Kenya use of charcoal in urban areas has risen by 64 per cent in two decades. Despite the charcoal industry providing employment to 500,000 people and generating over US$427 million that benefits grassroots communities, it has been kept out of the formal economies of this country. This review presents the status of the charcoal industry in Kenya, highlighting its contribution to livelihoods, production, utilisation, and implications for the environment; policy issues; and stakeholders' involvement. The review also proposes strategies to improve the sustainability of this sector.

La production de charbon de bois au Kenya et des stratégies pour l'augmentation de sa durabilité

Dans l'Afrique subsaharienne 72 pour cent de ménages urbains et 98 pour cent de ménages ruraux se servent du bois combustible pour leur propre énergie. Au Kenya l'usage de charbon de bois dans les secteurs urbains a augmenté par 64 pour cent au cours de deux décennies. Malgré le fait qu'elle fournit un emploi à 500,000 personnes et qu'elle génère plus de US$427 million de bénéfice aux collectivités populaires, l'industrie du charbon de bois reste écartée des économies formelles de ce pays. Cet examen présente la situation de l'industrie du charbon de bois au Kenya, en soulignant sa contribution aux moyens d'existence, à la production, et à l'utilisation ainsi que les implications pour l'environnement ; des questions concernant la politique ; et l'implication des parties prenantes. L'examen propose également des stratégies pour l'amélioration de la durabilité de cette industrie.

Producción de carbón y estrategias para aumentar su sostenibilidad en Kenia

En el África subsahariana, 72% de los hogares urbanos y 98% de los hogares rurales utilizan la leña como fuente de energía. En las áreas urbanas de Kenia, el uso de carbón ha aumentado 64% en dos décadas. A pesar de que la industria de carbón crea empleo para 500 mil personas, generando us$427 millones en beneficios para las comunidades de base, se la ha marginado de las economías formales de este país. El presente artículo examina la situación de la industria de carbón en Kenia, analizando, por un lado, su contribución a los medios de vida, y por otro, su forma de producción y su utilización, así como sus implicaciones para temas de política ambiental, además de la participación de los actores en la misma. Asimismo, el artículo propone estrategias para mejorar la sostenibilidad del sector.

Produção de carvão e estratégia para aumentar sua sustentabilidade no Quênia

Na África Subsaariana, 72 por cento de famílias da zona urbana e 98 por cento de famílias da zona rural utilizam lenha como fonte de energia. No Quênia,o uso de carvão nas áreas urbanas cresceu 64 por cento em duas décadas. Apesar da indústria de carvão proporcionar emprego a 500.000 pessoas e gerar mais de US$427 milhões que beneficiam comunidades de base, ela tem sido deixada de fora das economias formais deste país. Esta revisão apresenta o status da indústria de carvão no Quênia, destacando sua contribuição para os meios de subsistência, produção, utilização e implicações para o meio ambiente; questões de políticas e envolvimento dos stakeholders. A revisão também propõe estratégias para melhorar a sustentabilidade deste setor.  相似文献   

508.
Abstract

The purpose of the current study was to examine the effect of clothed and unclothed human figure drawings (HFDs) on children's reports of touch. Eighty 4/5-year-olds and 80 9/10-year-olds participated in a staged event in which measurements of their body parts (e.g. waistline) were taken. Specifically, they were touched on 10 different locations. Immediately or three weeks after the event, they had to report where they had been touched. Half of the children received a clothed HFD while the other half was provided with an unclothed HFD to assist children in their recall. When we compared children's recall before and after the presentation of a HFD, we found that clothed and unclothed HFDs significantly decreased the accuracy of children's reports of touch. So, although children reported more correct touches after the presentation of a HFD, they were also more likely to include more incorrect information in their reports of touch.  相似文献   
509.
Editorial     
Abstract

Mentors and school heads play cardinal roles in teacher education programmes in most countries, including Zimbabwe. The side-effects of such symbiosis have not yet been investigated fully. This article used a qualitative methodological approach to investigate the perceptions of some Zimbabwean student teachers regarding their teaching practice experiences. A sample of 10 ex-teaching practice students from a teacher education college was selected and interviewed during data collection using a semi-structured interview schedule. The participants reported a high prevalence of sexual harassment/aggression of the students by the host schools' heads and mentors, irrespective of student gender. The form of aggression included seeking sexual favours and intimidation. Most perpetrators used metaphors and satirical or sarcastic language to convey their intentions. The female student teachers reported higher incidences than did the male students. Constant workshopping is imperative to remind mentors and school heads of their professional and social obligations regarding teacher education.  相似文献   
510.
This article assesses the prospects for a clearly articulated economic diplomacy approach in South Africa's foreign policy. It argues that while South Africa's foreign policy has been to a considerable extent normatively grounded, it has failed to develop a coherent economic diplomacy that is based on focused and distinctly expressed priorities. This is a crucial gap that limits the country's ability to respond to regional and global changes, in particular those posed by emerging powers. The article identifies a number of gaps in South Africa's foreign policy approach and highlights its oblivion to global developments and geopolitical dynamics in the African continent. It sets out possible policy outlines for developing a clearer and stronger economic diplomacy. The building blocks for such an approach include the identification of strategic foreign policy priorities; greater institutional co-operation among agencies dealing with economic and foreign policy development; synergies between corporate strategies and government's foreign policy objectives; and the need for South Africa to develop a stronger leadership ambition in the African continent, both to contribute to Africa's development and to pursue its own economic interests. This ambition will require awareness of South Africa's own limitations, thus focusing the better part of its foreign policy on a limited set of countries that match strategic priorities.  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