全文获取类型
收费全文 | 643篇 |
免费 | 37篇 |
专业分类
各国政治 | 49篇 |
工人农民 | 48篇 |
世界政治 | 40篇 |
外交国际关系 | 30篇 |
法律 | 354篇 |
中国政治 | 1篇 |
政治理论 | 158篇 |
出版年
2024年 | 1篇 |
2023年 | 5篇 |
2022年 | 9篇 |
2021年 | 6篇 |
2020年 | 12篇 |
2019年 | 22篇 |
2018年 | 45篇 |
2017年 | 49篇 |
2016年 | 36篇 |
2015年 | 25篇 |
2014年 | 26篇 |
2013年 | 106篇 |
2012年 | 32篇 |
2011年 | 28篇 |
2010年 | 28篇 |
2009年 | 18篇 |
2008年 | 19篇 |
2007年 | 32篇 |
2006年 | 18篇 |
2005年 | 16篇 |
2004年 | 19篇 |
2003年 | 20篇 |
2002年 | 9篇 |
2001年 | 17篇 |
2000年 | 16篇 |
1999年 | 11篇 |
1998年 | 3篇 |
1997年 | 8篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1994年 | 4篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1990年 | 2篇 |
1989年 | 4篇 |
1988年 | 2篇 |
1986年 | 1篇 |
1985年 | 3篇 |
1984年 | 3篇 |
1983年 | 8篇 |
1981年 | 3篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1976年 | 2篇 |
1971年 | 1篇 |
排序方式: 共有680条查询结果,搜索用时 15 毫秒
61.
Björn Bäckström M.D. Bengt Johansson M.D. Ph.D. Anders Eriksson M.D. Ph.D. 《Journal of forensic sciences》2015,60(6):1662-1665
Nitrous oxide is an inflammable gas that gives no smell or taste. It has a history of abuse as long as its clinical use, and deaths, although rare, have been reported. We describe two cases of accidental deaths related to voluntary inhalation of nitrous oxide, both found dead with a gas mask covering the face. In an attempt to find an explanation to why the victims did not react properly to oncoming hypoxia, we performed experiments where a test person was allowed to breath in a closed system, with or without nitrous oxide added. Vital signs and gas concentrations as well as subjective symptoms were recorded. The experiments indicated that the explanation to the fact that neither of the descendents had reacted to oncoming hypoxia and hypercapnia was due to the inhalation of nitrous oxide. This study raises the question whether nitrous oxide really should be easily, commercially available. 相似文献
62.
Although there seems to be a broad consensus among economists that purely floating or completely fixed exchange rates (the so-called corner solutions) are the only viable alternatives of exchange rate management, many countries do not behave according to this paradigm and adopt a strategy within the broad spectrum of exchange rate regimes that is limited by the two corner solutions. Many of these intermediate regimes are characterized by significant foreign exchange market interventions and a certain degree of exchange rate flexibility with non-preannounced exchange rate targets. While academic research in this area usually concentrates on some specific aspects of intermediate regimes (such as the effectiveness of interventions or institutional aspects), managed floating has rarely been analyzed as a comprehensive monetary policy strategy. In this paper, we present a monetary policy framework in which central banks simultaneously use the exchange rate and the interest rate as operating targets of monetary policy. We explain the mechanics of foreign exchange market interventions and sterilization and we explain why a central bank has an interest of controlling simultaneously the two operating targets. We derive the monetary policy rules for the two operating targets from a simple open economy macro model in which the uncovered interest parity condition and the monetary conditions index play a central role. 相似文献
63.
With the aim of investigating factors affecting willingness to pay for municipality child care, a survey was undertaken in
Sweden of 1840 parents living in five municipalities of different sizes. On the basis of the greed-efficiency-fairness hypothesis
(Wilke, 1991) which is supported by results from experimental social dilemma research, it was hypothesized that perceived
fairness of how the quality of child care is distributed (equal, proportional to need, or proportional to payment) as well
as of method of payment (collectively by taxes or proportional to use by fees) would be important determinants of willingness
to pay. Results showed that perceived fairness of how quality of child care is distributed played some role but that other
factors had stronger effects. Perhaps also reflecting fairness considerations, willingness to pay by fees was on average higher
than willingness to pay by taxes. Predicted from previous research, willingness to pay by taxes was furthermore found to increase
with income and degree of use. However, willingness to pay by taxes showed an increase rather than the predicted decrease
with municipality size. 相似文献
64.
65.
66.
67.
68.
Research on deception detection in legal contexts has neglected the question of how the use of evidence can affect deception detection accuracy. In this study, police trainees (N=82) either were or were not trained in strategically using the evidence when interviewing lying or truth telling mock suspects (N=82). The trainees’ strategies as well as liars’ and truth tellers’ counter-strategies were analyzed. Trained interviewers applied different strategies than did untrained. As a consequence of this, liars interviewed by trained interviewers were more inconsistent with the evidence compared to liars interviewed by untrained interviewers. Trained interviewers created and utilized the statement-evidence consistency cue, and obtained a considerably higher deception detection accuracy rate (85.4%) than untrained interviewers (56.1%). 相似文献
69.
70.