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   895篇
  免费   36篇
各国政治   30篇
工人农民   94篇
世界政治   78篇
外交国际关系   46篇
法律   448篇
中国政治   7篇
政治理论   225篇
综合类   3篇
  2023年   2篇
  2022年   3篇
  2021年   4篇
  2020年   12篇
  2019年   19篇
  2018年   26篇
  2017年   33篇
  2016年   29篇
  2015年   33篇
  2014年   30篇
  2013年   139篇
  2012年   30篇
  2011年   29篇
  2010年   21篇
  2009年   23篇
  2008年   47篇
  2007年   43篇
  2006年   37篇
  2005年   35篇
  2004年   39篇
  2003年   31篇
  2002年   30篇
  2001年   21篇
  2000年   12篇
  1999年   16篇
  1998年   9篇
  1997年   13篇
  1996年   14篇
  1995年   12篇
  1994年   17篇
  1993年   12篇
  1992年   9篇
  1991年   3篇
  1990年   10篇
  1989年   9篇
  1988年   9篇
  1987年   6篇
  1986年   6篇
  1985年   7篇
  1984年   8篇
  1983年   2篇
  1982年   8篇
  1981年   6篇
  1980年   7篇
  1978年   4篇
  1977年   4篇
  1976年   6篇
  1975年   2篇
  1970年   1篇
  1966年   1篇
排序方式: 共有931条查询结果,搜索用时 27 毫秒
231.
Women's labor force participation and earnings dramatically increased after World War II. Those changes have important implications for women's Social Security benefits. This article uses the Social Security Administration's Modeling Income in the Near Term (version 6) to examine Social Security benefits for current and future beneficiary wives. The projections show that fewer wives in more recent birth cohorts will be eligible for auxiliary benefits as spouses because their earnings are too high. If their husbands die, however, most wives will still be eligible for survivor benefits because, despite the increase in their earnings over time, they still typically have lower earnings than their husbands. Even so, the share of wives who would be ineligible for widow benefits is projected to double between cohorts.  相似文献   
232.
Blacks, Hispanics, and divorced women have historically experienced double-digit poverty rates in retirement, and divorce and other demographic trends will increase their representation in future retiree populations. For these reasons, we might expect an increase in the proportion of economically vulnerable divorced women in the future. This article uses the Social Security Administration's Modeling Income in the Near Term (version 6) to describe the likely characteristics, work experience, Social Security benefit status, and economic well-being of future divorced women at age 70 by race and ethnicity. Factors associated with higher retirement incomes include having a college degree; having a strong history of labor force attachment; receiving Social Security benefits; and having pensions, retirement accounts, or assets, regardless of race and ethnicity. However, because divorced black and Hispanic women are less likely than divorced white women to have these attributes, income sources, or assets, their projected average retirement incomes are lower than those of divorced white women.  相似文献   
233.
4-Methylmethamphetamine has been detected in samples submitted for analysis in several states throughout Australia. Six ring substituted methyl isomers of methamphetamine and amphetamine were synthesised and analysed. As the regioisomeric 2-, 3- and 4-methylmethamphetamine and 2-, 3- and 4-methylamphetamine have virtually identical mass spectra, the use of MS is an ineffective technique to discriminate between these closely related compounds. We set out to determine whether the regioisomers could be differentiated by a combination of GC-MS, acetyl derivatisation and GC-IRD. We demonstrate that the three isomers of methylmethamphetamine and methylamphetamine can be separated by GC, and a combination of acetyl derivatisation and vapour phase IR can identify the specific ring substituted compound.  相似文献   
234.
235.
This article presents the first statewide data regarding correctional officers’ attitudes about and personal experiences with domestic violence. Online surveys were administered to Florida correctional officers asking a series of questions, including their beliefs and attitudes about the prevalence of domestic violence among colleagues, and their childhood and adult experiences with domestic violence. Results from 710 officers revealed that 33?% of respondents knew about correctional officers who had committed unreported domestic violence; 30?% reported that they had directly experienced domestic violence as children; and over 11?% reported that they had been physically violent with an intimate partner. Multivariate statistics showed that age, race, and childhood experiences with domestic violence were significantly related to correctional officers reporting being physically abusive to an intimate partner or family member. These and other findings highlight the need for increased agency prevention efforts and research on the phenomenon of correctional officer-involved domestic violence.  相似文献   
236.
Despite the growing number of interethnic marriages in the United States, few studies have examined intimate partner violence (IPV) in interethnic couples. This article examined past-year occurrences of IPV across interethnic and intraethnic couples and tested correlates of IPV specifically in interethnic couples. Data were from a national survey of couples 18 years of age and older from the 48 contiguous states. Interethnic couples (n = 116) included partners from different ethnic backgrounds, including Black-White, Hispanic-White, and Black-Hispanic couples. White (n = 555), Black (n = 358), and Hispanic (n = 527) intraethnic couples included partners with the same ethnicity. Data analyses were prevalence rates and logistic regressions. The analysis showed that interethnic couples were comparatively younger and had shorter relationships than intraethnic White, Black, and Hispanic couples. Male partners in interethnic couples had higher rates of binge drinking and alcohol problems compared with male partners in intraethnic couples. Past-year prevalence rates for any occurrence of IPV and acts of severe IPV were higher for interethnic couples relative to intraethnic couples. Most occurrences of IPV for interethnic couples were mutual. Factors predicting IPV among interethnic couples included marital status, couples' age, male alcohol problems, and female impulsivity. Mounting evidence points to interethnic couples as a high-risk group for IPV. Interethnic couples may be at greater risk for IPV because of their younger age, binge drinking, and alcohol problems. Future research could build on this study by examining cohort effects and regional differences in IPV for interethnic couples and the risk for IPV across interethnic couples of different ethnic compositions.  相似文献   
237.
238.
Vasquez's (1996) rivalry escalation theory stressed territorial disputes as the principal focus for a two-path explanation of war. Neighbors fight over adjacent space and non-neighbors sometimes join ongoing wars between neighbors. But major powers are also much concerned with positional issues. Expanding the war motivation focus to encompass both spatial and positional issues facilitates the development of a new, more elaborate theory from which several new hypotheses can be derived, in addition to the older ones. Testing of the new theory can also proceed with rivalry data not based on dispute density measures, different types of contiguity can be assessed, and the presence of spatial-positional issues can be measured directly, as opposed to relying on a proximity proxy. The empirical outcome strongly supports the two-path, two-issue theory. In the major power subsystem, noncontiguous rivals outnumber contiguous rivals, dyadic wars are scarce, and war joining has been the norm. Spatial issues alone would have a hard time accounting for this pattern. Variable mixes of spatial and positional issues are able to account for it and a number of derived hypotheses reasonably well. This is not the last word on rivalry escalation to war but it appears to be an additional step in the right direction.  相似文献   
239.
240.
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