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   1652篇
  免费   52篇
各国政治   108篇
工人农民   69篇
世界政治   160篇
外交国际关系   110篇
法律   709篇
中国政治   17篇
政治理论   516篇
综合类   15篇
  2023年   9篇
  2022年   6篇
  2021年   10篇
  2020年   21篇
  2019年   54篇
  2018年   44篇
  2017年   49篇
  2016年   56篇
  2015年   34篇
  2014年   38篇
  2013年   335篇
  2012年   43篇
  2011年   36篇
  2010年   40篇
  2009年   39篇
  2008年   61篇
  2007年   42篇
  2006年   55篇
  2005年   45篇
  2004年   47篇
  2003年   51篇
  2002年   42篇
  2001年   40篇
  2000年   29篇
  1999年   33篇
  1998年   24篇
  1997年   22篇
  1996年   21篇
  1995年   23篇
  1994年   24篇
  1993年   26篇
  1992年   22篇
  1991年   25篇
  1990年   16篇
  1989年   25篇
  1988年   19篇
  1987年   17篇
  1986年   22篇
  1985年   17篇
  1984年   24篇
  1983年   14篇
  1982年   14篇
  1981年   10篇
  1980年   7篇
  1979年   12篇
  1978年   12篇
  1977年   6篇
  1975年   5篇
  1972年   5篇
  1969年   5篇
排序方式: 共有1704条查询结果,搜索用时 15 毫秒
181.
The aim of this paper is to provide an exploratory review of the extent to which some of the leading companies in the food and drinks industry are publicly addressing water stewardship as part of their corporate sustainability strategies. The paper begins with an introductory outline of the growing importance of water stewardship and a brief discussion of corporate sustainability. The paper draws its empirical material from the most recent information on water stewardship posted by the leading companies in the food and drinks industry's corporate websites. The findings reveal that the vast majority of the selected companies address a number of elements concerning water stewardship as part of their more general approach to corporate sustainability. However, corporate commitments to water stewardship can be interpreted as being driven as much by business imperatives as by any specific concerns for environmental sustainability or a genuine desire to maintain the viability and integrity of natural ecosystems. More critically, the authors suggest that the selected companies' commitments to water stewardship are framed within existing business models focused on technological improvements in eco‐efficiency and continuing economic growth. The paper provides an accessible review of the water stewardship issues being pursued by the leading players in the food and drinks industry, and as such, it will interest academics, students, political commentators and business managers interested in water stewardship and corporate sustainability. Copyright © 2014 John Wiley & Sons, Ltd.  相似文献   
182.
Cars     
  相似文献   
183.
184.
Although 'Law in Context' is a well-known motto for law-and-society scholarship, the idea could benefit from closer examination. This paper introduces a principle of `fidelity to context' and suggests that contexts may be transcended by invoking general purposes and principles. These issues have special relevance for contextual analysis of free speech, academic freedom, and other rights and responsibilities. I also consider the relevance of legal pluralism, and the contextual analysis of human rights.  相似文献   
185.
186.
187.
Under the policy of direct certification for free school meals, school districts use information shared by state agencies about household eligibility for means‐tested programs in the state in order to determine the potential eligibility for free meals of students enrolled in the district. This information allows districts to automatically approve students in these eligible households for free meals without requiring the household to complete the application process. This paper examines the impacts of direct certification on students' likelihood of becoming certified for free meals, using data from a national survey of school food service directors as well as statelevel administrative data on program participation. A state‐level fixed effects model is estimated to account for the possibility of selection bias. The key finding is that direct certification leads to a statistically significant increase in the number of children getting free school meals. More generally, this finding highlights a promising approach for improving access to means‐tested programs without compromising program integrity. © 2008 by the Association for Public Policy Analysis and Management.  相似文献   
188.
189.
190.
Healthy male volunteers drank neat whisky in amounts corresponding to 0.51, 0.68, or 0.85 g ethanol/kg body weight in 15-25 min after an overnight (10 h) fast. Urine was collected immediately before drinking and then at 60 min intervals for 7-8 h after intake. The volumes of urine voided were measured and the concentrations of alcohol (UAC) were determined by an enzymatic method. Ethanol-induced diuresis showed large inter-subject variations. The flow of urine was maximum between 60 and 120 min post-drinking when the median rates of production were 117 ml/h (range 55-335), 113 ml/h (range 41-453) and 373 ml/h (range 215-485) for 0.51, 0.68, and 0.85 g ethanol/kg respectively. The output of urine returned to normal (30-60 ml/h) after the peak UAC had passed despite an elevated blood alcohol concentration (BAC). The average amount of alcohol excreted in urine was 0.29 g (S.D. 0.119), 0.44 g (S.D. 0.246), and 1.00 g (S.D. 0.427) after the consumption of 0.51, 0.68 and 0.85 g ethanol/kg respectively. Neither peak diuresis nor the amount of alcohol excreted depended on a subject's age between 20 and 60 years. This work shows that after drinking a moderate dose of alcohol, only 0.7-1.5% of the amount consumed is excreted unchanged in urine. Ethanol-induced diuresis is most pronounced for the first 1-2 h after drinking (rising BAC). The production of urine returns to normal during the post-absorptive state.  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