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   623篇
  免费   42篇
各国政治   46篇
工人农民   62篇
世界政治   56篇
外交国际关系   59篇
法律   327篇
中国政治   9篇
政治理论   102篇
综合类   4篇
  2023年   11篇
  2022年   3篇
  2021年   9篇
  2020年   30篇
  2019年   21篇
  2018年   43篇
  2017年   47篇
  2016年   47篇
  2015年   30篇
  2014年   25篇
  2013年   75篇
  2012年   28篇
  2011年   22篇
  2010年   20篇
  2009年   26篇
  2008年   18篇
  2007年   28篇
  2006年   30篇
  2005年   24篇
  2004年   18篇
  2003年   13篇
  2002年   21篇
  2001年   6篇
  2000年   8篇
  1999年   2篇
  1998年   7篇
  1997年   4篇
  1996年   2篇
  1995年   3篇
  1994年   5篇
  1993年   2篇
  1992年   1篇
  1991年   5篇
  1990年   2篇
  1988年   3篇
  1986年   3篇
  1985年   6篇
  1984年   3篇
  1983年   6篇
  1982年   3篇
  1978年   2篇
  1977年   1篇
  1975年   1篇
  1969年   1篇
排序方式: 共有665条查询结果,搜索用时 31 毫秒
551.
Policy instruments are a fundamental component of public policies. Policy instruments are often a result of mediation within the policy design process, whenever decision makers reshape existing instruments without introducing any real innovation. This results in imitation, layering and ambiguity in tool choice selection, and raises the theoretical problem of the logic according to which decision makers choose certain specific policy instruments rather than others. Decision makers may have different reasons for choosing certain specific instruments, although these reasons should be connected to the two main purposes of decision-making, that is, the search for effectiveness and the construction of a shared sense, a common acceptance. Thus, the choice of instruments is a question of potentially conflicting drivers that decision makers have to cope with within a specific decisional situation, when asked to solve those problems that have arisen. This paper examines this question and offers an analytical framework based on the two main factors in terms of which the selection of instruments is channelled and assessed: legitimacy and instrumentality. The boundaries created by how decision makers perceive these two dimensions mean that only four selection patterns can be chosen by decision makers: hybridization, stratification, contamination or routinization.  相似文献   
552.
The transition to adulthood is a major life course transition that can pose risk to wellbeing. Research is needed to identify patterns of risk for compromised wellbeing, in order to best identify supports for individuals during this potentially vulnerable transition. The purpose of this study was to identify profiles of risk in an emerging adulthood sample, and to relate these profiles to mental health and subjective and academic wellbeing. Undergraduate emerging adults (N?=?903, 82?% female), aged 18–25 years (M?=?21.14, SD?=?1.75), completed a series of questionnaires about risk factors, mental health, and academic variables. Results from a latent profile analysis identified four distinct risk profiles: Low Risk (76?%), Low Social Support Risk (4?%), Financial Risk (11?%), and Multiple Risk (8?%). The risk profiles were subsequently related to mental health and subjective and academic wellbeing outcomes, using a pseudo-class draws approach. Analyses indicated that the risk-pattern profiles differed in several ways across outcomes. Implications for targeted interventions are discussed.  相似文献   
553.
554.
555.
This article examines the history of legal discussion of the harms of child pornography possession and viewing in the United States and Canada, with special attention to the evolving conception of direct harms to children and youth pictured in these images. The article further addresses ongoing uncertainty about harms associated with images that do not record an instance of sexual abuse, but where the harm arises solely from non-consensual distribution of nude and/or sexual images. Achieving greater understanding and recognition of both the similarities and differences between the harms that arise from the “permanent record of abuse” and from ongoing circulation and use of images beyond the subject's control are necessary in order to equip both clinical and legal practitioners with the knowledge they need in order to provide appropriate support for victims of the varied forms of sexual abuse related to sexual image online.  相似文献   
556.
This article quantifies the level of women’s empowerment in western Honduran coffee-producing households through the construction of the Women’s Empowerment in Agriculture Index, and highlights the determinants of each empowerment indicator and their interactions. Women in the study region suffer from a lack of control over use of income and access to productive resources. Since control and ownership of assets are positively correlated with input in productive decisions and control over the use of income in this study region, it is suggested that “low-hanging fruit” to improve empowerment would be to invest in interventions that strengthen asset control and distribution.  相似文献   
557.
Russia’s 2014 annexation of Crimea without the consent of Ukraine was a rare case of a state taking territory from a state with whom it previously enjoyed friendly relations. The paper seeks to explain the causes and consequences of this annexation by examining theories of democratic peace, constructivism and irredentism. In 1971, political scientist Myron Weiner published an article “The Macedonian Syndrome” in the journal World Politics (vol. 23, no. 4, 665–683). In particular, the paper examines the applicability of Weiner’s theses to Russia’s 2014 attempt to annex Crimea from Ukraine. While Weiner’s theory helps to explain Russia’s moves, his theory can be updated to consider the consequences of those moves. Russia attempted to justify its annexation by transposing the concept of friendship from Ukraine itself to a piece of its territory – Crimea. This transposition rested on a false dichotomy between Ukraine and Crimea, and Russia’s failure to live up to its international commitments to respect Ukrainian borders brought swift consequences in the form of Western sanctions.  相似文献   
558.
The need for agile and proper identification of drugs of abuse has encouraged the scientific community to improve and to develop new methodologies. The drug lysergic acid diethylamide (LSD) is still widely used due to its hallucinogenic effects. The use of voltammetric methods to analyze narcotics has increased in recent years, and the possibility of miniaturizing the electrochemical equipment allows these methods to be applied outside the laboratory; for example, in crime scenes. In addition to portability, the search for affordable and sustainable materials for use in electroanalytical research has grown in recent decades. In this context, employing paper substrate, graphite pencil, and silver paint to construct paper-based electrodes is a great alternative. Here, a paper-based device comprising three electrodes was drawn on 300 g/m2 watercolor paper with 8B pencils, and its efficiency was compared to the efficiency of a commercially available screen-printed carbon electrode. Square wave voltammetry was used for LSD analysis in aqueous medium containing 0.05 mol/L LiClO4. The limits of detection and quantification were 0.38 and 1.27 μmol/L, respectively. Both electrodes exhibited a similar voltammetric response, which was also confirmed during analysis of a seized LSD sample, with recovery of less than 10%. The seized samples were previously analyzed by GCMS technique, employing the full scan spectra against the software spectral library. The electrode selectivity was also tested against 3,4-methylenedioxymethamphetamine (MDMA) and methamphetamine. It was possible to differentiate these compounds from LSD, indicating that the developed paper-based device has potential application in forensic chemistry analyses.  相似文献   
559.
High-quality digital three-dimensional (3D) reconstructions of microscopic findings have been used in anatomical and histopathologic research, but their use in forensic pathology may also be of interest. This paper presents an application of these methods to better characterize the pathway of a stab wound of the anterior surface of the heart in a case of suicide. A portion of the heart wall including the stab wound was serially sectioned for microscopic analysis along the full extent of the wound. Histologic sections were digitally acquired, and a 3D reconstruction was created with ImageJ software for 3D computer graphics. This showed a full-thickness wound path extending to the endocardial surface of the left ventricle, curvilinear in appearance. After correction for shrinkage, 3D reconstruction allowed estimation of the dimensions of the myocardial injury and comparison of the appearance of the wound with the suspected knife used. The curvilinear appearance was considered to reflect injury during myocardial contraction. Complete microscopic sectioning and 3D reconstruction may allow virtual sectioning through various orientations and also provide useful forensic information for selected injuries.  相似文献   
560.
This paper uses a two-person linear voluntary contribution mechanism with stochastic marginal benefits from a public good to examine the effect of imperfect information on contributions. Estimates of individual risk preferences are obtained using data from second-price auctions over lotteries. The results show that limited information about the value of the public good significantly lowers average contributions in all periods but the last. Moreover, the results support the interpretation that subjects bid “as if” they were risk averse, and suggest that “as if” risk-averse behavior is negatively correlated with willingness to contribute.  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