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   13290篇
  免费   410篇
  国内免费   15篇
管理学   1632篇
民族学   80篇
人才学   1篇
人口学   1162篇
丛书文集   143篇
理论方法论   1235篇
综合类   692篇
社会学   7095篇
统计学   1675篇
  2023年   72篇
  2021年   107篇
  2020年   209篇
  2019年   259篇
  2018年   339篇
  2017年   483篇
  2016年   336篇
  2015年   269篇
  2014年   318篇
  2013年   2079篇
  2012年   488篇
  2011年   468篇
  2010年   397篇
  2009年   338篇
  2008年   400篇
  2007年   419篇
  2006年   429篇
  2005年   372篇
  2004年   295篇
  2003年   259篇
  2002年   275篇
  2001年   344篇
  2000年   286篇
  1999年   275篇
  1998年   202篇
  1997年   170篇
  1996年   164篇
  1995年   172篇
  1994年   159篇
  1993年   163篇
  1992年   188篇
  1991年   189篇
  1990年   185篇
  1989年   160篇
  1988年   167篇
  1987年   193篇
  1986年   148篇
  1985年   160篇
  1984年   180篇
  1983年   153篇
  1982年   152篇
  1981年   122篇
  1980年   111篇
  1979年   125篇
  1978年   95篇
  1977年   79篇
  1976年   93篇
  1975年   109篇
  1974年   86篇
  1972年   63篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
931.
The findings of a recent study of extradyadic involvements and sexual jealousy among college-age couples are reported. Evidence is brought to bear in support of the principle finding that several aspects of the jealousy experience (eliciting factors, manner of expression) can and do vary widely among individuals. Despite the apparent universality of the jealousy phenomenon, communication in couples is inhibited by the social disapproval associated with its occurrence, and consequently discrepancies such as those evidenced in this study may pass entirely unobserved. As a result, jealousy problems remain unresolved and may serve to trigger further dissension. In light of these findings, developing communication skills is identified as the appropriate treatment mode for sexual jealousy.  相似文献   
932.
933.
Religious preference at several points in the life cycle is examined with regard to its affect on socioeconomic achievement and with regard to how religious preference is influenced by education, occupation, and income. The importance of considering the several major denominations separately instead of as a single category is demonstrated. When this is done Jews, Presbyterians, and Episcopalians have above average socioeconomic achievements; Methodists and Catholics are near the mean; and Baptists are below the average. Controlling for social origins and early achievements greatly attenuates the differences, but does not remove them with regard to education and income.  相似文献   
934.
The sociological evidence available to date has not firmly established the relationship between suicide and social status. It is postulated here that societies in different stages of development may manifest different patterns of etiology of suicide, and thus the suicide rates of different social strata may change over time. Educational attainment is used as an indicator of social status, rather than “usual” occupations as in previous studies. From an analysis of a transitional society, it is concluded: first, the relation between suicide and social status is negative; and second, with coming societal changes, it is likely that the relation between suicide and social status will also change.  相似文献   
935.
936.
Public opinion surveys purport to express the public's opinion. The literature on survey techniques has, however, recognized various potential limitations to the validity of survey results. While improved survey methodology may reduce statistical bias and improve validity, it cannot avoid the implicit weighting of preferences. This normative aspect of surveying has often been unrecognized or disguised as a purely technical matter. Such things as sample selection, choice of survey instrument and the method of aggregating results will each contribute to a pattern of preference weights. Several common survey techniques are examined in this light. It is proposed that no single ‘correct’ method of preference aggragation exists. Increased public recognition of, and debate on this normative aspect of surveying is recommended.  相似文献   
937.
938.
939.
940.
Twenty-four-hour recall data from the Continuing Survey of Food Intake by Individuals (CSFII) are frequently used to estimate dietary exposure for risk assessment. Food frequency questionnaires are traditional instruments of epidemiological research; however, their application in dietary exposure and risk assessment has been limited. This article presents a probabilistic method of bridging the National Health and Nutrition Examination Survey (NHANES) food frequency and the CSFII data to estimate longitudinal (usual) intake, using a case study of seafood mercury exposures for two population subgroups (females 16 to 49 years and children 1 to 5 years). Two hundred forty-nine CSFII food codes were mapped into 28 NHANES fish/shellfish categories. FDA and state/local seafood mercury data were used. A uniform distribution with minimum and maximum blood-diet ratios of 0.66 to 1.07 was assumed. A probabilistic assessment was conducted to estimate distributions of individual 30-day average daily fish/shellfish intakes, methyl mercury exposure, and blood levels. The upper percentile estimates of fish and shellfish intakes based on the 30-day daily averages were lower than those based on two- and three-day daily averages. These results support previous findings that distributions of "usual" intakes based on a small number of consumption days provide overestimates in the upper percentiles. About 10% of the females (16 to 49 years) and children (1 to 5 years) may be exposed to mercury levels above the EPA's RfD. The predicted 75th and 90th percentile blood mercury levels for the females in the 16-to-49-year group were similar to those reported by NHANES. The predicted 90th percentile blood mercury levels for children in the 1-to-5-year subgroup was similar to NHANES and the 75th percentile estimates were slightly above the NHANES.  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