全文获取类型
收费全文 | 29656篇 |
免费 | 612篇 |
国内免费 | 1篇 |
专业分类
管理学 | 4097篇 |
民族学 | 197篇 |
人口学 | 3978篇 |
丛书文集 | 74篇 |
教育普及 | 1篇 |
理论方法论 | 2250篇 |
综合类 | 459篇 |
社会学 | 14181篇 |
统计学 | 5032篇 |
出版年
2023年 | 133篇 |
2022年 | 84篇 |
2021年 | 137篇 |
2020年 | 366篇 |
2019年 | 534篇 |
2018年 | 2184篇 |
2017年 | 2374篇 |
2016年 | 1600篇 |
2015年 | 459篇 |
2014年 | 625篇 |
2013年 | 3592篇 |
2012年 | 1067篇 |
2011年 | 1746篇 |
2010年 | 1497篇 |
2009年 | 1169篇 |
2008年 | 1315篇 |
2007年 | 1443篇 |
2006年 | 540篇 |
2005年 | 624篇 |
2004年 | 662篇 |
2003年 | 560篇 |
2002年 | 457篇 |
2001年 | 478篇 |
2000年 | 427篇 |
1999年 | 409篇 |
1998年 | 315篇 |
1997年 | 262篇 |
1996年 | 308篇 |
1995年 | 290篇 |
1994年 | 248篇 |
1993年 | 257篇 |
1992年 | 304篇 |
1991年 | 297篇 |
1990年 | 289篇 |
1989年 | 254篇 |
1988年 | 248篇 |
1987年 | 202篇 |
1986年 | 230篇 |
1985年 | 250篇 |
1984年 | 216篇 |
1983年 | 193篇 |
1982年 | 160篇 |
1981年 | 130篇 |
1980年 | 155篇 |
1979年 | 172篇 |
1978年 | 133篇 |
1977年 | 114篇 |
1976年 | 87篇 |
1975年 | 91篇 |
1974年 | 93篇 |
排序方式: 共有10000条查询结果,搜索用时 187 毫秒
291.
The objective is to summarize the pattern of Egyptian migration to Arab oil-producing countries (AOPC), to review some factors that are important determinants of labor movement based on theory, and to empirically model the migration rate to AOPC and to Saudi Arabia. Factors are differentiated as to their relative importance. Push factors are the low wages, high inflation rate, and high population density in Egypt; pull factors are higher wages. It is predicted that an increase in income from destination countries has a significant positive impact on the migration rate. An increase in population density stimulates migration. An increase in inflation acts to increase out-migration with a 2-year lag, which accommodates departure preparation. Egypt's experience with labor migration is described for the pre-oil boom, and the post-oil boom. Several estimates of labor migration are given. Government policy toward migration is positive. Theory postulates migration to be determined by differences in the availability of labor, labor rewards between destination and origin, and the cost of migration. In the empirical model, push factors are population density, the current inflation rate, and the ratio of income/capita in AOPC to Egypt. The results indicate that the ratio of income/capita had a strong pull impact and population density had a strong push impact. The inflation rate has a positive impact with a lag estimated at 2 years. Prior to the Camp David Accord, there was a significant decrease in the number of Egyptian migrants due to political tension. The findings support the classical theory of factor mobility. The consequences of migration on the Egyptian economy have been adverse. Future models should disaggregate data because chronic shortages exist in some parts of the labor market. Manpower needs assessment would be helpful for policy makers. 相似文献
292.
Odaman OM 《Habitat International》1992,16(1):113-120
Data concerning 624 randomly selected mothers in Ekpoma Region, Nigeria, are used to analyze socioeconomic and cultural determinants of fertility. Factors considered include education, occupation, income, religion, age at first marriage, breast-feeding, and contraceptive practice. The author concludes that the conditions for fertility decline are now in place and that this decline could be accelerated by discouraging early marriage, increasing female education, and promoting contraception. 相似文献
293.
294.
Thomas-hope EM 《International migration (Geneva, Switzerland)》1986,24(3):559-572
The author analyzes international migration patterns of Caribbean populations, with particular attention to the persistence of significant return flows. A typology of migration in the region is presented, which includes categories of transients or shuttle migrants and settlers or long-stay migrants. Skill or occupational changes, principal remittances, and migration objectives of each group are summarized. The social, economic, and policy implications of international circulation in the Caribbean are considered. (SUMMARY IN FRE AND SPA) 相似文献
295.
Montgomery MR Richards T Braun HI 《Journal of the American Statistical Association》1986,81(394):297-309
This study examines the possibility that estimation of the effect of breast-feeding on infant survival is affected by selection bias, in that children who are healthier at birth may be more likely to be breast-fed. Data are from the 1976 Malaysian Family Life Survey. "Ordinary logit models for breast-feeding and survival are estimated, and the results suggest that selection is indeed present. For example, children of higher birth weight appear to be more likely to be breast-fed and likely to survive. In addition, weight at birth and the duration of breast-feeding appear to be linked." Using birth weight as an indicator for the child's health, the authors conclude that "the direct influence of breast-feeding on survival remains of overwhelming importance even after corrections for selection bias are made." 相似文献
296.
"This paper seeks to (1) identify socioeconomic variables that are expected to generate fertility differentials; (2) hypothesize the direction and magnitude of the effect of each variable by reference to a demand-for-children model; and (3) test empirically the model using evidence from Costa Rica. The estimates are obtained from a ten-percent systematic random sample of all Costa Rican individual-family households. There are 15,924 families in the sample...." The authors specifically seek "to capture the effects of changing relative prices and available income and time constraints on parental preferences for children. Least-squares estimates show statistically significant relationships between household fertility and opportunity cost of time, parental education, occurrence of an extended family, medical care, household sanitation, economic sector of employment, and household stock of nonhuman capital." 相似文献
297.
Miller MJ 《The International migration review》1986,20(4):740-757
In the introduction to this special issue on temporary worker programs, the author defines the term temporary worker and reviews worldwide research, writings, and policies to date pertaining to temporary workers. Labor market and economic effects, socio-administrative conditions, and effects on the labor-sending societies are discussed. Noting that mutually exclusive arguments are presented within one issue of the journal, the author introduces the authors of the individual articles and their subjects. It is determined that the temporary worker phenomenon is now global and that having an understanding of these workers is increasingly central to understanding key socioeconomic and political processes affecting modern industrial and nonindustrial societies. 相似文献
298.
Shah NM 《The International migration review》1986,20(4):815-832
An analysis of the foreign population in Kuwait shows that foreign nationals make up 60 percent of the population and 78 percent of the labor force in Kuwait. The implications of these figures for the Kuwaiti labor force are discussed by analyzing the occupational structures of Kuwaitis and non-Kuwaitis. "Structural analysis of the labor force indicates that 62 percent of Kuwaiti males are concentrated in administrative and service occupations while their percentage in sales and production work has declined during 1970-80. This demonstrates the need for reorienting educational/training programs and changing Kuwaiti attitudes towards manual work to ensure the realization of the 'Kuwaitization' process, and balance the nationals with foreign nationals." mortality has stabilized at relatively high levels and there is resistance to family planning. The author concludes that the main cause of the stalling of the demographic transition process is to be found in the role of the state and the dynamics of the social structure and that "demographic trends will depend more on the changes in social structure, land reforms, and response of the formal governing system to the needs of the underprivileged sections of the society, rather than on the health and family planning policies." 相似文献
299.
"This article highlights important developments in the character of temporary worker flows to Canada between 1973 and 1985 through the use of unpublished data and new measures for analyzing this data. The number of employment authorizations are converted to person years to indicate the overall labor market impact of temporary worker flows and this measure is employed in an analysis of unpublished data from Employment and Immigration Canada. The analysis reveals that a significant and growing proportion of employment authorizations are exempted from governmental procedures which link the admission of temporary workers to the Canadian labor market." Reasons for these exemptions and policy implications are discussed 相似文献
300.
According to recent evidence, adoptive placements that do not work out are increasingly common. This article reviews research on rates of, and contributors to, adoption and "foster-adoption" disruptions and dissolutions. Implications for practice are included. 相似文献