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   709篇
  免费   23篇
各国政治   35篇
工人农民   146篇
世界政治   34篇
外交国际关系   40篇
法律   339篇
中国政治   13篇
政治理论   122篇
综合类   3篇
  2023年   2篇
  2021年   4篇
  2020年   7篇
  2019年   17篇
  2018年   26篇
  2017年   28篇
  2016年   14篇
  2015年   15篇
  2014年   20篇
  2013年   111篇
  2012年   17篇
  2011年   19篇
  2010年   18篇
  2009年   27篇
  2008年   23篇
  2007年   22篇
  2006年   25篇
  2005年   16篇
  2004年   25篇
  2003年   18篇
  2002年   25篇
  2001年   14篇
  2000年   16篇
  1999年   14篇
  1998年   10篇
  1997年   14篇
  1996年   15篇
  1995年   11篇
  1994年   4篇
  1993年   6篇
  1992年   14篇
  1991年   14篇
  1990年   9篇
  1989年   13篇
  1988年   8篇
  1987年   7篇
  1986年   8篇
  1985年   9篇
  1984年   9篇
  1983年   7篇
  1982年   11篇
  1981年   6篇
  1980年   10篇
  1979年   4篇
  1978年   5篇
  1977年   5篇
  1976年   2篇
  1973年   2篇
  1970年   1篇
  1969年   2篇
排序方式: 共有732条查询结果,搜索用时 31 毫秒
581.
The revised Directive on waste (Directive 2008/98/EC) enteredinto force on 12 December 2008. The purpose of the revised Directiveis to simplify the existing legislative framework for wastein order to encourage the divergence of waste away from landfills,to strengthen legal certainty and minimise burdens on businesses,regulators and stakeholders. This article explores the mainfeatures of the revised Directive and assesses them againstthe European Commissions' intentions in introducing the Directive.In addition, the paper considers the extent to which the revisedDirective promotes successfully (i) reduction of natural resourceuse, (ii) prevention of environmental impacts of waste generation,(iii) life-cycle thinking and; (iv) securing waste prevention.The paper concludes that there is still room for further clarification,particularly in relation to the criteria for by-products andthe new waste management terms ‘end of waste’ and‘preparing for re-use’. Whilst the revised Directivehas weaknesses and limitations it should be considered withinthe context of decision-making. In this way it represents amulti-party, multi-institutional and multi-national compromisewhich should be considered as a progressive step towards improvingthe whole life-cycle of products and resources. Undoubtedly,the revised Directive sets the tone for future legislative developmentsand bolsters the importance of extended producer responsibilityin future waste management measures.  相似文献   
582.
It is common for researchers using animal or human remains for scientific study to freeze samples prior to use. However, effects of freezing on bone macro‐ or microstructure are relatively unknown. The research objective of this study was to determine whether freezing could potentially bias experimental results by analyzing changes in bone mineral density (BMD) with the freezing of remains over time. Eight fetal pigs were scanned to determine their initial BMD before freezing. Three piglets underwent a freeze‐thaw cycle to assess the effects of the freezing process. Four piglets were frozen and scanned weekly for 20 weeks to assess freezing over time. The overall average between the fresh initial scan and final frozen scan was significantly different (p < 0.001). Per contra, the final thawed BMD scans did not differ from the initial fresh scan (p = 0.418). Thus, completely thawed remains are recommended for experimental studies.  相似文献   
583.
ABSTRACT

Syrian refugees are causing upheavals in Jordan’s economy and education. Unemployment of Jordan’s native youth is 29.9% without the addition of unemployed refugees further threatening the stability of the country. The cost of educating, sheltering, feeding and integrating them into the cities with resulting school congestion creates resentment in citizens paying 60% of their national budget for refugees. To alleviate educational pressures alone, Jordan solicited funding from the European Union, United Kingdom, Germany, United States and Norway. Together, they pledged 81.5 million in May 2016 to expand education for Jordan’s refugee children. From the refugees’ perspective, all face similar challenges in gaining access to classrooms, adapting to the culture taught in the schools and catching up academically as they try to prepare for and seek employment to survive. Jordan’s government has implemented two 5-year educational reorganization programmes Educational Reform for Knowledge Economy (ERfKE) I, II that are in many cases unknowingly shifting instruction from idealism to pragmatism. This philosophical movement towards pragmatism is less expensive and more effective for future employment of all students in contrast to the existing idealistic system. Jordan’s transitioning changes in educational philosophies and programmes provide visions for Jordan’s future. Their educational adaptations provide suggestions for other refugee host countries.  相似文献   
584.
585.
This paper takes up Avtar Brah's (1999) invitation to write back to the issues she raises in her mapping of the production of gendered, classed and racialised subjectivities in west London. It addresses two topics that, together, illuminate racialised and gendered interpellation and psychosocial processes. The paper is divided into two main sections. The first draws on empirical research on the transition to motherhood conducted in east London to consider one mother's experience of giving birth in the local maternity hospital. The maternity ward constituted a site where racialised difference became salient, leading her to construct her maternal identity by asserting her difference from Bangladeshi mothers and so self-racialising, as well as ‘othering’ Bangladeshi mothers. The paper analyses the ways in which her biography may help to explain why her experience of the maternity hospital interpellates her into racialised positioning. The second section focuses on media responses to the riots in various English cities in August 2011. It examines the ways in which some media punditry racialised the riots and inclusion in the British postcolonial nation. The paper analyses three sets of commentaries and illuminates the ways in which they racialise the debate in essentialising ways, reproducing themes that were identified in the 1980s as ‘new racism’ and apportioning blame for the riots to ‘black gangster culture’. While these media pronouncements focus on racialisation, they are intersectional in implicitly also invoking gender and social class. The paper argues that the understanding of the mother's self-racialisation is deepened by a consideration of the racialised discourses that can be evoked (and are contested) in periods of social unrest. The paper thus draws on part of the methodology of ‘The Scent of Memory’ in layering media readings and biographical narratives to analyse the contemporary psychosocial space of racialisation.  相似文献   
586.
Scholars of public health identify globalization as a major cause of obesity. Free markets are blamed for spreading high calorie, nutrient-poor diets, and sedentary lifestyles across the globe. Global trade and investment agreements apparently curtail government action in the interest of public health. Globalization is also blamed for raising income inequality and social insecurities, which contribute to “obesogenic” environments. Contrary to recent empirical studies, this study demonstrates that globalization and several component parts, such as trade openness, FDI flows, and an index of economic freedom, reduce weight gain and obesity among children and youth, the most likely age cohort to be affected by the past three decades of globalization and attendant lifestyle changes. The results suggest strongly that local-level factors possibly matter much more than do global-level factors for explaining why some people remain thin and others put on weight. The proposition that globalization is homogenizing cultures across the globe in terms of diets and lifestyles is possibly exaggerated. The results support the proposition that globalized countries prioritize health because of the importance of labor productivity and human capital due to heightened market competition, ceteris paribus, even if rising incomes might drive high consumption.  相似文献   
587.
Existing studies examining social capital and housing instability have overlooked structural factors such as discrimination, providing an incomplete explanation of the relationship between social capital and housing instability. This study addresses this limitation by exploring how discrimination and social capital are related to housing instability. This study is a secondary analysis of data collected during the Atlanta Neighborhood Pilot study. The sample consists of mostly African American adults who resided in the Atlanta metropolitan area in 2013 (n = 691). After controlling for sociodemographic characteristics, residential mobility, and public assistance, stepwise logistic regression identified social capital and discrimination as significant predictors of housing instability. Lower social capital and higher everyday discrimination scores were associated with increased odds for housing instability. Individuals 35 or older, those with annual incomes between $25,000 and $50,000, and those who reported receiving public assistance during their lifetime also had increased odds for housing instability. Findings identify characteristics of individuals vulnerable to housing instability and suggest that social capital development as a housing intervention warrants further exploration. These findings can be utilized by policymakers and practitioners to better target funding and to create efficient systems better equipped to deploy early homelessness prevention interventions.  相似文献   
588.
Picking up the question of what FLaK might be, this editorial considers the relationship between openness and closure in feminist legal studies. How do we draw on feminist struggles for openness in common resources, from security to knowledge, as we inhabit a compromised space in commercial publishing? We think about this first in relation to the content of this issue: on image-based abuse continuums, asylum struggles, trials of protestors, customary justice, and not-so-timely reparations. Our thoughts take us through the different ways that openness and closure work in struggles against violence, cruel welcomes, and re-arrangements of code and custom. Secondly, we share some reflections on methodological openness and closure as the roundtable conversation on asylum, and the interview with Riles, remind us of #FLaK2016 and its method of scattering sources as we think about how best to mix knowledges. Thirdly, prompted by the FLaK kitchen table conversations on openness, publishing and ‘getting the word out’, we respond to Kember’s call to ‘open up open access’. We explain the different current arrangements for opening up FLS content and how green open access, the sharedit initiative, author request and publisher discretion present alternatives to gold open access. Finally drawing on Franklin and Spade, we show how there are a range of ‘wench tactics’—adapting gifts, stalling and resting—which we deploy as academic editors who are trying to have an impact on the access, use and circulation of our journal, even though we do not own the journal we edit. These wench tactics are alternatives to the more obvious or reported tactic of resignation, or withdrawing academic labour from editing and reviewing altogether. They help us think about brewing editorial time, what ambivalence over our 25th birthday might mean, and how to inhabit painful places. In this, we respond in our own impure, compromised way to da Silva’s call not to forget the native and slave as we do FLaK, and repurpose shrapnel, in our common commitments.  相似文献   
589.
A collaborative 18 month study was conducted within 4 protected mangroves areas in Airai State, Southeast Babeldaob and the Republic of Palau with traditional men and women groups. Water quality, forest structure, and the size distribution and relative abundance of the mud crab, Scylla serrata and the clam Anodontia edulenta were studied. Water quality parameters differed significantly between sites as follows: pH (F=16.8; df=3,138; p〈0.000), turbidity (KW-H=22.07; df=3,162; p〈0.0006), salinity (F=19.8; df=3,366; p〈0.000), dissolved oxygen (KW-H=13.4; dr=3, 169; p〈0.0012) and temperature (F=4.33; df=3,157; p〈0.006). The total mean density of all trees was 2,077±225 stems ha^-1 and differed significantly between sites (KW-H=9.3; df=3; p〈0.02). The total mean basal area was 18.9±2.76 m^2ha^-1 and differed significantly between sites (KW-H=36.2; df=3; p〈0.000). The total mean volume of all trees was 679 m^3ha^-1 ± 201 m^3ha^-1. The total mean density of saplings was 1,234 ± 297 saplings ha^-1. The mean percent tree canopy cover significantly differed between sites (F=3.3; df=3, 32; p〈0.02). Mean soil elevation decreased at sites 1 and 4 and increased at sites 2 and 3. The mean soil accretion was greater at sites 1 and 3 than sites 2 and 4. The mean weight for all crabs was significantly different between sites (F=3.2; df=3, 178; p〈0.02). The mean weight for 55 females was 0.62 g ± 0.04 kg (SE) and differed significantly between sites (F=4.2; dr=3, 51; p〈0.01). The mean weight for 157 males was 0.75 ± 0.04kg (SE). The mean carapace width (CW) for all crabs was 14.30 ± 0.20 cm (SE). The mean carapace width (CW) for 56 females was 14.4 ± 0.35cm (SE) and significantly differed between sites (F=4.6; df=3, 52; p〈0.006). The mean carapace width (CW) for 157 males was 14.3 ± 0.21 cm. The mean CPUE for all sites was 0.48 ± 0.04 crabs trapl night^-1 (SE) and significantly differed between sites (F=2.9; df=3, 77; p=0.04). A total of 21 tagged crabs were recaptured in the same area they were initially tagged, of which 3 male crabs had molted. A male was recaptured in the same trap 180 days after capture at Site 1 ; the carapace width increased by 3.6 cm and a weight increase of 0.75kg. A single A. edulenta was found in the protected areas. Clams harvested in Airai State outside the protected areas were significantly smaller than clams harvested in northwest Babeldaob (F=14.8; df=1, 198;p〈0.0002). Crab fishers and the community recommended a harvest ban on female crabs, enforcement of existing 6inch CW harvest size limit, further investigation of point sources of coliform bacteria and sediment pollution and a harvest limit on mangrove trees.  相似文献   
590.
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