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   5148篇
  免费   102篇
管理学   681篇
民族学   24篇
人口学   523篇
丛书文集   20篇
教育普及   1篇
理论方法论   489篇
综合类   59篇
社会学   2390篇
统计学   1063篇
  2023年   32篇
  2021年   50篇
  2020年   89篇
  2019年   117篇
  2018年   128篇
  2017年   194篇
  2016年   139篇
  2015年   81篇
  2014年   133篇
  2013年   784篇
  2012年   160篇
  2011年   145篇
  2010年   124篇
  2009年   111篇
  2008年   137篇
  2007年   127篇
  2006年   150篇
  2005年   112篇
  2004年   113篇
  2003年   76篇
  2002年   98篇
  2001年   132篇
  2000年   122篇
  1999年   132篇
  1998年   101篇
  1997年   86篇
  1996年   93篇
  1995年   68篇
  1994年   60篇
  1993年   87篇
  1992年   89篇
  1991年   97篇
  1990年   78篇
  1989年   78篇
  1988年   61篇
  1987年   68篇
  1986年   62篇
  1985年   75篇
  1984年   66篇
  1983年   69篇
  1982年   44篇
  1981年   40篇
  1980年   37篇
  1979年   47篇
  1978年   38篇
  1977年   33篇
  1976年   34篇
  1975年   32篇
  1974年   40篇
  1973年   29篇
排序方式: 共有5250条查询结果,搜索用时 0 毫秒
991.
A simulation model is developed to account for observed changes in mean household wealth both overall and by age cohort over the 1962–1983 period in the United States. There are three major findings. First, capital gains are the major factor explaining overall wealth changes and account for 77% of the simulated growth in wealth over the entire period. Second, for cohorts under age 40, inheritance and inter vivos transfers dominate observed changes in wealth. Indeed, the oldest age groups appear to have transferred sizable amounts of their wealth to younger generations inter vivos, raising the wealth of these younger groups substantially above what it would be based on saving. Third, while differences in portfolio composition favored the younger cohorts over this period, such differences do not explain a large portion of the great variation in real wealth changes by cohort over the two decade period.The authors wish to thank Kevin Camerlo, Maury Gittleman and Kim Hiskey for research and programming assistance.  相似文献   
992.
Even though second generation immigrants make up ever increasing population shares in industrialized countries we know little about their social integration and wellbeing. This study focuses on the educational attainment of German born children of immigrants. Their schooling success still lags behind that of natives. This paper investigates school attendance and completed degrees of second generation immigrants and finds that even after controlling for characteristics the educational gap remains large and significant. The available evidence suggests that this group as a whole does not assimilate to native educational standards and instead increasingly falls behind.This research was completed while the author was guest at the Institute for the Study of Labor (IZA) in Bonn, Germany. I am grateful for IZAs hospitality and particularly for the help of Thomas K. Bauer. I thank the anonymous referees and the editors for very helpful comments. Responsible editors: David Card and Christoph M. Schmidt.  相似文献   
993.
Kritz MM  Gurak DT 《Demography》2001,38(1):133-145
In this paper we examine the internal migratory response, by native-born non-Hispanic white men and foreign-born men in the United States, to recent immigration. Our analysis does not support the claim that natives have made a migratory response to recent immigration. Native-born men and foreign-born men were less likely to leave states that received large numbers of immigrants in the 1980s than they were to leave other states, and native-born men had less propensity toward out-migration than did foreign-born men. Out-migration was most likely to be deterred if recent immigrants originated in Europe or Asia. Although native-born non-Hispanic white men showed a tendency toward out-migration if recent immigrants originated in Latin America or the Caribbean, this result was insignificant after we controlled for state economic and regional context.  相似文献   
994.
This paper examines the variations in the quality of life at the relatively neglected inter-urban scale in a developing nation. Based on a sample survey of 3800 heads of households in Nigerian cities ranked into three categories: large, medium and small, the study found that level-of-living is related to city size, with the residents of large cities having a higher quality of life than those in the medium and small cities.  相似文献   
995.
T Li 《人口研究》1983,(6):49-50
The National Committee on Family Planning conducted a sample survey of fertility in the Yi-yang area in September 1982. The survey was focused on the marriage and fertility status of women between the ages of 15 and 67. Results from this survey show that early marriage is still very popular. Only 40% of those surveyed delayed their marriage to a later age. There is a need to educate the people on the benefits of late marriage. In addition, statistics show that the average fertility rate for a woman was 6.8 children in 1970 and 2.35 children in 1982. This recent figure is still too high when compared with the under 1.2 figure suggested by the central government. Among the total number surveyed, only 77% have taken birth control measures, and the other 23% still have not taken any birth control measures. The phenomenon shows that popular education on late marriage and having children at a later age is still urgently needed in order to further reduce the fertility rate. Married couples of childbearing age should be taught effective birth control measures and knowledge of eugenics with better education for the next generation. In this way, the masses may participate actively and positively in the national family planning campaign.  相似文献   
996.
997.
Woofter TJ 《Demography》1967,4(2):532-552
Between 1940 and 1960 the Southeast experienced both economic and demographic revolutions. They were interrelated in many ways. Agriculture was mechanized and reorganized making millions of farmers and farm laborers surplus. The natural assets of the region were developed and industry grew more rapidly than in other regions. There were marked changes in the labor force, a rapid increase in the proportion of women employed and a decrease in the proportion of Negroes. The level of family income rose faster than in other regions.Five and three quarter million persons were transferred from the farm population. A net of 2.7 million left the region and 3 million were absorbed in nonfarm areas within the region. In 1960 52 percent of the population was in cities. Increase was especially fast in metropolitan urban areas, mostly in suburbs. There were also substantial increases in the rural nonfarm areas. Small cities as a group showed no net in-migration. Among the net migrants out of the region the ratio was 4 colored to1 white.The age and sex distribution was warped, especially below age 30, slowing down the early marriage rate and the crude birth rate.The projection of the trend which was being followed in the early 1960s indicates that the regional rate of increase may overtake that of the rest of the country, being particularly rapid in the young adult and adolescent ages.For the purposes of this study the Southeast includes: South Carolina, Georgia, Alabama, Mississippi, and Louisiana. These were originally the heaviest cotton producing states and the heart of the sharecropping area where the reorganization of the economy was particularly disruptive.  相似文献   
998.
Ruzicka LT 《Demography》1974,11(3):397-406
The impact of changes in age patterns of nuptiality on the net reproduction rate is examined using life table techniques and assuming that age-specific fertility within marriage and fertility outside of marriage are fixed. In the second section, a standardization technique is used to investigate the impact of changes in nuptiality on age-cumulative measures of marital fertility. Examples using data for selected generations of Australian women demonstrate the extent to which recent changes in average completed family size in Australia were affected by changing nuptiality patterns.  相似文献   
999.
Gay neighborhoods serve as vital places for gay men's socializing, yet few studies have examined their contributions to gay men's health-either directly or indirectly via residents' social networks. Drawing from theoretical perspectives on community and networks, we test hypotheses concerning whether gay neighborhoods and social network factors are associated with patterns of recent illicit drug use among a sample of 740 urban gay men from New York City. Higher odds of drug use were observed among individuals who resided in gay neighborhoods, had networks composed predominantly of other gay men, and had increased socialization with gay men. Network factors did not mediate associations between gay neighborhoods and drug use. These findings highlight the need to better contextualize the health risks faced by gay men by accounting for both neighborhood and network structures.  相似文献   
1000.
Isaacowitz and Stanley review age differences in facial emotion recognition, an ability tied to effective socioemotional functioning but often marked by age-related decline. They highlight major findings from the past decade and conclude that age-related declines exist but are least pronounced for positive relative to negative emotions. They discuss possible motivational and structural explanations for this positivity effect, and they describe future research avenues for evaluating age-related differences in more ecologically valid contexts. In this commentary, we discuss each of these topics. We state that many complexities that arise when interpreting age differences are similar to issues raised by emotion scholars who have studied intrapersonal and interpersonal processes outside of the developmental literature. We argue that theoretical and methodological lessons gained from these emotion scholars would provide insight to interpret current findings and direct future research in life-span development.  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