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   2080篇
  免费   37篇
各国政治   153篇
工人农民   65篇
世界政治   160篇
外交国际关系   120篇
法律   1212篇
中国政治   8篇
政治理论   390篇
综合类   9篇
  2023年   16篇
  2022年   12篇
  2021年   20篇
  2020年   41篇
  2019年   31篇
  2018年   69篇
  2017年   41篇
  2016年   48篇
  2015年   83篇
  2014年   78篇
  2013年   388篇
  2012年   93篇
  2011年   73篇
  2010年   105篇
  2009年   95篇
  2008年   80篇
  2007年   101篇
  2006年   94篇
  2005年   87篇
  2004年   62篇
  2003年   31篇
  2002年   47篇
  2001年   99篇
  2000年   17篇
  1999年   17篇
  1998年   15篇
  1997年   15篇
  1996年   12篇
  1995年   10篇
  1994年   12篇
  1993年   13篇
  1992年   12篇
  1991年   7篇
  1990年   5篇
  1989年   15篇
  1988年   13篇
  1987年   16篇
  1986年   15篇
  1985年   14篇
  1984年   17篇
  1983年   4篇
  1982年   15篇
  1981年   8篇
  1980年   11篇
  1979年   11篇
  1978年   11篇
  1977年   9篇
  1975年   7篇
  1973年   4篇
  1967年   6篇
排序方式: 共有2117条查询结果,搜索用时 15 毫秒
61.
62.
Why the First World War ended in 1918 and not earlier remains a major puzzle. We propose a new theory that emphasizes how honor prolongs wars beyond what rationalist theories can explain. It argues that when honor is insulted, an affronted actor will strive to punish the offender. Absent an apology, the pursuit of a satisfactory punishment leads the affronted belligerent to ignore unfavorable battlefield information, hold logically irreconcilable beliefs, process information in emotional terms, and obsess over status. We predict that wars of prevention and territorial occupation are most likely to elicit honor considerations. We test our argument against an obscure episode in the war where Germany and the United States made peace overtures in December 1916. We demonstrate that honor concerns made Entente decision makers see German aggression as an affront to their honor that only the destruction of Germany's political regime could redress.  相似文献   
63.
64.
The following paper was discovered by Laurence Evans, Professor of History at the State University of New York at Binghamton, during the course of research in the files of the Department of State (to which Department the paper had been made available in 1918 for use as background information by the American Delegation at the Peace Conference), and Professor Evans has kindly communicated it to the Society. Its contents are not included in the book on Mecca which Snouk published in German, and it is not among the scattered articles in Verspreide Geschriften (1923–27). That collection does, however, include another essay about Ahmad Dahlan, in Dutch, entitled “Een rector der Mekkaansche universiteit”, originally contributed to a learned journal and reprinted in vol. 111, pp. 65–122. [We are printing this paper in good faith believing it to be previously unpublished. Ed.]  相似文献   
65.
66.
67.
Journal of Family Violence - The purpose of the study is to explore whether the association between types of parenting styles and bullying and victimization are similar across White American,...  相似文献   
68.
The Journal of Technology Transfer - University-industry collaboration (UIC) partners’ different organizational backgrounds entail socialization with distinct thought worlds, management...  相似文献   
69.
International Journal for the Semiotics of Law - Revue internationale de Sémiotique juridique - The article deals with the problem of coining terms and nomenclature signs with proper names...  相似文献   
70.
Ammonium nitrate fuel oil is an explosive mixture found in most antipersonnel landmines (APL) buried throughout the Colombian territory. During more than 50 years of internal conflict, the Colombian government has found that trained dogs are the most effective method to detect APL. However, the olfactive signature in ANFO is unknown and also if there are differences in detection related to the explosive manufacturing origin. Therefore, this work begins with the analytical validation of the method used to determine ammonia, in its derivatized form as carbamate, released by home-made ANFO using HS-SPME-GC-FID. Once validated, the method was used to identify ammonia and other organic volatile compounds present in ANFO, under laboratory and simulated field conditions. The validation process includes the evaluation of the optimum conditions for the derivation and extraction of butylcarbamate, the determination of the working ranges with linear response in FID, the limits of detection and quantification, the sensitivity, and the precision. The results of the validation established linearity and sensitivity in a concentration between 20 and 120 mg/L, as well as low limits of detection and quantification of 6.4 and 21.4 mg/L, respectively. Also, an intermediate precision of 11% for butylcarbamate with a repeatability of 8%. The validated method showed in real samples of home-made ANFO besides ammonia, the presence of low molecular methylamines, and also exhibited differences in volatile compositions according to the origin. The objective of this work is to offer a reliable analytical methodology for the extraction and analysis of volatile compounds from ANFO.  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