全文获取类型
收费全文 | 11147篇 |
免费 | 357篇 |
专业分类
各国政治 | 466篇 |
工人农民 | 339篇 |
世界政治 | 909篇 |
外交国际关系 | 439篇 |
法律 | 6611篇 |
中国政治 | 65篇 |
政治理论 | 2602篇 |
综合类 | 73篇 |
出版年
2020年 | 136篇 |
2019年 | 166篇 |
2018年 | 223篇 |
2017年 | 261篇 |
2016年 | 294篇 |
2015年 | 191篇 |
2014年 | 232篇 |
2013年 | 1256篇 |
2012年 | 283篇 |
2011年 | 277篇 |
2010年 | 266篇 |
2009年 | 269篇 |
2008年 | 293篇 |
2007年 | 339篇 |
2006年 | 345篇 |
2005年 | 299篇 |
2004年 | 296篇 |
2003年 | 310篇 |
2002年 | 275篇 |
2001年 | 379篇 |
2000年 | 379篇 |
1999年 | 290篇 |
1998年 | 182篇 |
1997年 | 143篇 |
1996年 | 117篇 |
1995年 | 139篇 |
1994年 | 139篇 |
1993年 | 122篇 |
1992年 | 211篇 |
1991年 | 206篇 |
1990年 | 189篇 |
1989年 | 217篇 |
1988年 | 195篇 |
1987年 | 217篇 |
1986年 | 193篇 |
1985年 | 227篇 |
1984年 | 177篇 |
1983年 | 186篇 |
1982年 | 146篇 |
1981年 | 143篇 |
1980年 | 105篇 |
1979年 | 142篇 |
1978年 | 108篇 |
1977年 | 97篇 |
1976年 | 80篇 |
1975年 | 67篇 |
1974年 | 80篇 |
1973年 | 82篇 |
1971年 | 58篇 |
1970年 | 59篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
141.
142.
143.
144.
Robert C. Luskin 《Political Behavior》1990,12(4):331-361
Debates over the political sophistication of mass publics smolder on. The more fundamental question, however, is why people become as politically sophisticated or unsophisticated as they do. This paper develops a nonlinear simultaneous equation model to weigh explanations of three general sorts: the politicalinformation to which people are exposed, theirability to assimilate and organize such information, and theirmotivation to do so. The estimates suggest that interest and intelligence, representing motivation and ability, have major effects, but that education and media exposure, the big informational variables, do not. I consider the reasons and sketch some implications for the sophistication of mass publics, for the study of sophistication and other variables of extent, and for democratic theory.An earlier version of this paper was presented at the annual meeting of the Midwest Political Science Association, Chicago, IL, April 9–11, 1987. The data were made available by the Inter-University Consortium for Political and Social Research. Douglas Arnold, John Bolland, Thad Brown, Carol Cassel, Philip Converse, George Kateb, Jan Kmenta, Kathleen Knight, James Kuklinski, Kenneth Langton, Melvin Manis, Diana Owen, Thomas Rochon, Marianne Stewart, Paul Sniderman, James Stimson, and Herbert Weisberg have provided feedback and encouragement. James Gibson relayed his results on the intelligence measures, even as they came off the printer. Mary Lee Luskin helped in many ways. If errors remain, they are mine. 相似文献
145.
146.
147.
148.
149.
150.
This paper describes some of the spinoff benefits that can result from R&D projects, and categorizes them in terms of the dimensions of market and technical newness. These dimensions are discussed with reference to two types of spinoffs: 1) alternative market applications, when the results of an R&D project are subsequently applied to a market or use that differs from the originally intended application, and 2) second-generation technologies, when the technology that was the subject of an R&D project is significantly altered or enhanced in unanticipated ways through subsequent R&D. Examples from the Department of Energy's Energy-Related Inventions Program are integrated into the results of literature review to illustrate key concepts, including core technologies, degrees of market and technology newness, technology robustness, and the nature of connections linking spinoffs to prior R&D investments. The paper concludes by discussing spinoffs as a managerial strategy. 相似文献