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   184篇
  免费   15篇
各国政治   21篇
世界政治   26篇
外交国际关系   10篇
法律   83篇
中国政治   9篇
政治理论   50篇
  2023年   1篇
  2021年   2篇
  2020年   7篇
  2019年   9篇
  2018年   4篇
  2017年   9篇
  2016年   8篇
  2015年   7篇
  2014年   10篇
  2013年   40篇
  2012年   5篇
  2011年   4篇
  2010年   9篇
  2009年   3篇
  2008年   5篇
  2007年   7篇
  2006年   9篇
  2005年   10篇
  2004年   8篇
  2003年   5篇
  2002年   4篇
  2000年   6篇
  1999年   2篇
  1998年   1篇
  1997年   5篇
  1995年   2篇
  1992年   2篇
  1991年   1篇
  1988年   1篇
  1987年   2篇
  1986年   3篇
  1985年   1篇
  1978年   1篇
  1975年   1篇
  1974年   2篇
  1970年   1篇
  1966年   1篇
  1965年   1篇
排序方式: 共有199条查询结果,搜索用时 46 毫秒
171.
Campaign finance regulation is an important issue for democracies. Proponents of stricter contribution limits believe it will improve competitiveness. Opponents argue that contribution caps are just a mask for incumbency protection. This paper comments on John Lott’s 2006 article in “Campaign Finance Reform and Electoral Competition” in Public Choice.  相似文献   
172.
A fully validated, sensitive and specific method for the extraction and quantification of Δ9-tetrahydrocannabinol (THC) and 11-nor-9-carboxy-Δ9-THC (THC-COOH) and for the detection of 11-hydroxy-Δ9-THC (11-OH THC) in oral fluid, urine and whole blood is presented. Solid-phase extraction and liquid chromatography–mass spectrometry (LC–MS) technique were used, with electrospray ionization. Three ions were monitored for THC and THC-COOH and two for 11-OH THC. The compounds were quantified by selected ion recording of m/z 315.31, 329.18 and 343.16 for THC, 11-OH THC and THC-COOH, respectively, and m/z 318.27 and 346.26 for the deuterated internal standards, THC-d3 and THC-COOH-d3, respectively. The method proved to be precise for THC and THC-COOH both in terms of intra-day and inter-day analysis, with intra-day coefficients of variation (CV) less than 6.3, 6.6 and 6.5% for THC in saliva, urine and blood, respectively, and 6.8 and 7.7% for THC-COOH in urine and blood, respectively. Day-to-day CVs were less than 3.5, 4.9 and 11.3% for THC in saliva, urine and blood, respectively, and 6.2 and 6.4% for THC-COOH in urine and blood, respectively. Limits of detection (LOD) were 2 ng/mL for THC in oral fluid and 0.5 ng/mL for THC and THC-COOH and 20 ng/mL for 11-OH THC, in urine and blood. Calibration curves showed a linear relationship for THC and THC-COOH in all samples (r2 > 0.999) within the range investigated.The procedure presented here has high specificity, selectivity and sensitivity. It can be regarded as an alternative method to GC–MS for the confirmation of positive immunoassay test results, and can be used as a suitable analytical tool for the quantification of THC and THC-COOH in oral fluid, urine and/or blood samples.  相似文献   
173.
The purpose of this paper is to show thatthe linear penalization to inflation foundin Walsh (1995) is not the government'soptimal choice when the fixed part of thetransfer scheme is any given constant and thepayment to the central bank represents acost for the government.  相似文献   
174.
175.
Two constitutional features frame Mexico’s arrival to democracy: the creation of credible electoral institutions and the preservation of rules corresponding to the authoritarian regime inherited from the decade of the ‘30s in the twentieth century. These two sets of rules clash with each other, a fact which explains the low levels of democratic governance and the low quality of legislation and public policies. The political debate over this contradiction seems to have reached the lowest point and several different alternatives have been formulated to break the deadlock; nevertheless, the necessary political agreements that may clearly define a political path have not been reached. The article describes these processes and lays out the alternatives in dispute as well as possible outcomes in the near future.  相似文献   
176.
Departing from the received fact that research joint venture agreements are allowed on the grounds of a permissive ruling, we study what conditions are necessary for venture partners to carry on RD cooperation to the marketing stage. We treat the case of product innovations exploitable with different usages in unconnected markets. Two main results appear: firms always have incentives for a distribution of varieties, but not always agree on the distribution of products. The condition for the last result to happen gives a useful rule for antitrust authorities relating the degree of sustitutability across varieties and the relative profitability of the markets.  相似文献   
177.
The Central American countries are divided by profound political differences. Yet surprising similarities exist in the changing relations between the public and private sectors. Throughout the region, public and private sectors lock into a vicious circle. The inability of the state to provide order and social harmony creates disincentives for the private sector to invest or even to continue existing levels of production. The government responds by increasing its responsibilities at the expense of the private sector. In doing so it assumes risks the private sector refuses, but further alienates the private sector nonetheless.  相似文献   
178.
Through the ages Scotch whisky has been the drink of kings, politicians, entertainers and those who aspire to the finer things in life.It’s traditionally drunk with a splash of water,straight up or with the debonair "on the rocks" by-line.  相似文献   
179.
Brief narratives of two recent events in Luzon island—a flashflood in Angeles City and an eruption of Mayon volcano—underscore the disparity between natural hazards as amplifiers of everyday hardship for many Filipinos and the Philippine disaster management system's orientation towards extreme‐event response. Three major factors contribute to this dichotomy. First, population dynamics combined with the lack of access to resources compels poor Filipinos to live and work in hazardous areas, discounting risk from extreme natural events to focus on daily needs. Second, the institutional setting of the country's disaster management within the military establishment makes it difficult, though not impossible, to focus and address the underlying causes of vulnerability. Third, existing modes of funding disaster expenditures are all biased towards immediate response rather than long‐term risk‐reduction. The implications of these findings to disaster management and research in the Philippines are identified. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献   
180.

Objectives

Self-reports and questionnaires have been the preferred research methods in the criminological field of “fear of crime” (FOC) since its rise in the 1960s. Our study had two main goals: (1) to measure the physiological indicators of fear in real time and (2) to compare these data with those obtained through self-reports, designed also to measure the emotion of fear.

Methods

An experimental study was conducted over the course of a week during late February 2016 in Aarhus (Denmark), in which the focus was on traditional environmental variables in the field of FOC (i.e., poor lighting conditions).

Results

Our results support the ideas that: (1) the absence of good luminosity in an open public space in an urban setting elicits physiological reactions of arousal that can be taken as indicators of experiences of fear and (2) heart rate appears to capture aspects of the emotion of fear that are not reflected in data obtained through self-report questionnaires.

Conclusions

This study, introducing a pioneering approach to the study of FOC, presents great potentials in complementing traditional methods in the crime sciences. The many challenges we faced are significant and reported with the hope that subsequent literature will build upon. We propose that traditional methods and new measurements could be combined to advance research in the field by allowing researchers to more unambiguously constrain the interpretation of their data. This becomes particularly relevant in a field like FOC, which has long suffered from irreconcilable results stemming from different investigations.
  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