全文获取类型
收费全文 | 19728篇 |
免费 | 356篇 |
国内免费 | 1篇 |
专业分类
管理学 | 2832篇 |
民族学 | 71篇 |
人才学 | 1篇 |
人口学 | 1898篇 |
丛书文集 | 79篇 |
教育普及 | 2篇 |
理论方法论 | 1776篇 |
现状及发展 | 1篇 |
综合类 | 268篇 |
社会学 | 9441篇 |
统计学 | 3716篇 |
出版年
2021年 | 119篇 |
2020年 | 292篇 |
2019年 | 397篇 |
2018年 | 473篇 |
2017年 | 627篇 |
2016年 | 498篇 |
2015年 | 356篇 |
2014年 | 469篇 |
2013年 | 3110篇 |
2012年 | 657篇 |
2011年 | 628篇 |
2010年 | 469篇 |
2009年 | 391篇 |
2008年 | 457篇 |
2007年 | 473篇 |
2006年 | 465篇 |
2005年 | 444篇 |
2004年 | 407篇 |
2003年 | 382篇 |
2002年 | 418篇 |
2001年 | 525篇 |
2000年 | 535篇 |
1999年 | 463篇 |
1998年 | 345篇 |
1997年 | 314篇 |
1996年 | 325篇 |
1995年 | 302篇 |
1994年 | 284篇 |
1993年 | 289篇 |
1992年 | 345篇 |
1991年 | 319篇 |
1990年 | 287篇 |
1989年 | 291篇 |
1988年 | 289篇 |
1987年 | 251篇 |
1986年 | 244篇 |
1985年 | 279篇 |
1984年 | 268篇 |
1983年 | 253篇 |
1982年 | 215篇 |
1981年 | 182篇 |
1980年 | 164篇 |
1979年 | 194篇 |
1978年 | 178篇 |
1977年 | 159篇 |
1976年 | 135篇 |
1975年 | 158篇 |
1974年 | 118篇 |
1973年 | 115篇 |
1972年 | 94篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
331.
332.
This Bulletin examines the evidence that the world's fertility has declined in recent years, the factors that appear to have accounted for the decline, and the implications for fertility and population growth rates to the end of the century. On the basis of a compilation of estimates available for all nations of the world, the authors derive estimates which indicate that the world's total fertility rate dropped from 4.6 to 4.1 births per woman between 1968 and 1975, thanks largely to an earlier and more rapid and universal decline in the fertility of less developed countries (LDCs) than had been anticipated. Statistical analysis of available data suggests that the socioeconomic progress made by LDCs in this period was not great enough to account for more than a proportion of the fertility decline and that organized family planning programs were a major contributing factor. The authors' projections, which are compared to similar projections from the World Bank, the United Nations, and the U.S. Bureau of the Census, indicate that, by the year 2000, less than 1/5 of the world's population will be in the "red danger" circle of explosive population growth (2.1% or more annually); most LDCs will be in a phase of fertility decline; and many of them -- along with most now developed countries -- will be at or near replacement level of fertility. The authors warn that "our optimistic prediction is premised upon a big IF -- if (organized) family planning (in LDCs) continues. It remains imperative that all of the developed nations of the world continue their contribution to this program undiminished." 相似文献
333.
334.
Tucker DJ 《The Social service review》1980,54(1):13-30
This study investigates the validity of the assumption that coordination and citizen participation are related inversely and, thus, are incompatible as features in the same social service reform strategy. Seventeen social service organizations situated in the same urban area were studied. Data were obtained by structured interview. The concepts of coordination and citizen participation were operationalized by means of scales. The findings support the validity of the assumption noted above. Although interpretations of the findings can be provided, they are post-factum. This implies a need for explanatory research which might be guided by theories of community power structure and of organizational behavior. 相似文献
335.
Public policy decisions in health are increasingly difficult and expensive. Although there will never be enough information available, private foundations can help to bridge the most important gaps in knowledge. Larger foundations may also wish to respond to those who doubt the value of foundation activities. This article reviews the experiences over the past eight years of The Robert Wood Johnson Foundation in employing evaluation and related social research procedures in the planning and implementation of a major philanthropic effort to improve the health and medical care of Americans. Discussed are the still evolving Foundation evaluation framework, the unanticipated problems in undertaking specific evaluations, and the substantive findings of some of the studies. 相似文献
336.
The authors present the results of revised population projections for Poland for 1985 based on the final results of the 1978 population census. Assumptions made in previous projections are critically reviewed, as are the population estimates on which those projections were based 相似文献
337.
The increasing need for business to monitor the social dimensions of its environment and, hopefully make some forecasts of future trends has met with some constructive response from academics and consultants although not as yet on a very liberal scale. The published literature does not indicate to what extent companies in general attemp social forecasting and, where they do, the degree of integration which exists within their corporate planning systems. The authors, therefore, decided to survey a sample of British organizations to see if they could shed some light on these issues and thereby add some information to the excellent accounts of individual cases of social forecasting in, they suspect, the more advanced and atypical companies. The survey suggests a general picture of: awareness of the value of social forecasting; fairly widespread ignorance of the techniques which do exist, primitive though these may largely be; successful integration of social forecasting into the corporate planning systems of a substantial number of organizations but not in the majority. 相似文献
338.
Simon JL 《Population studies》1980,34(3):476-486
Summary The theory of the low-level equilibrium trap asserts that an increase in income stimulates population growth sufficiently so that the additional people 'eat up' the 'surplus' over subsistence, and hence drive the level of income back to subsistence. Originally the theory referred primarily to mortality, but nowadays its application is to fertility. In the long-run equilibrium context in which the theory is ordinarily presented, the fact that the long-run elasticity of fertility with respect to income is negative in less developed countries fatally contradicts the accepted version of the trap. But to give every chance for trap theory to be meaningful, the paper presents a period-by-period analysis, embodying larger-than-observed positive elasticities during the early years and the logically necessary counterbalancing negative elasticities during the later years. These elasticities are combined with consumption and production figures for various age groups to estimate the effect in each year after the windfall, and altogether. The results show that even under assumptions not charitable to the conclusion of this paper, additional children do not even come close to 'eating up' the increase in income which induced their births, so that the trap theory is falsified. 相似文献
339.
340.