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   14966篇
  免费   247篇
  国内免费   2篇
管理学   1932篇
民族学   69篇
人才学   4篇
人口学   1328篇
丛书文集   82篇
理论方法论   1349篇
综合类   126篇
社会学   7211篇
统计学   3114篇
  2022年   76篇
  2021年   76篇
  2020年   207篇
  2019年   266篇
  2018年   390篇
  2017年   507篇
  2016年   352篇
  2015年   284篇
  2014年   351篇
  2013年   2708篇
  2012年   505篇
  2011年   392篇
  2010年   359篇
  2009年   290篇
  2008年   339篇
  2007年   351篇
  2006年   356篇
  2005年   344篇
  2004年   293篇
  2003年   303篇
  2002年   319篇
  2001年   379篇
  2000年   335篇
  1999年   334篇
  1998年   255篇
  1997年   229篇
  1996年   284篇
  1995年   227篇
  1994年   240篇
  1993年   212篇
  1992年   243篇
  1991年   259篇
  1990年   239篇
  1989年   204篇
  1988年   222篇
  1987年   211篇
  1986年   160篇
  1985年   200篇
  1984年   220篇
  1983年   194篇
  1982年   157篇
  1981年   141篇
  1980年   128篇
  1979年   144篇
  1978年   113篇
  1977年   107篇
  1976年   86篇
  1975年   80篇
  1974年   78篇
  1973年   80篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
221.
This is the second of the Paul F. Lazarsfeld Lectures, whichwill be presented annually under the auspices of the Centerfor the Social Sciences of Columbia University, heir to theBureau of Applied Social Research. James S. Coleman's paper,delivered on March 7, 1980, follows upon the first Lecture,given by Hans Zeisel in Philadelphia under the auspices of theCenter for Research on the Acts of Man. From this time forward,the Public Opinion Quarterly plans to ensure continuity of publicationof the annual Lectures in the journal which Paul Lazarsfelddid so much to sustain.  相似文献   
222.
Network analysis, a methodology derived from general systems' theory, can be utilized as a community mental health administrative-evaluation procedure. Evaluation parameters derived from analysis of patient data as they “flow” through a network of agency services, provide measures of systemic functioning. These parameters include “longest paths” and various ratio relationships as evaluation measures of service delivery. The limitations of network analysis are examined by means of conceptual analyses, and phenomena that emerged from research experience. The necessity for both quantitative and qualitative data to ensure a meaningful evaluation of mental health services is explained. Conclusions about the value of the network analysis approach are considered.  相似文献   
223.
Summary In the second part of this article the number and nature of hospital cases treated in the light of physical, medical and surgical limitations are examined. Each hospital's records of treatment are summarised and discussed. Whether or not the hospitals were able to tackle successfully some of the major diseases and causes of death and thereby exert a positive influence in reducing mortality rates is then considered. Two main conclusions are drawn. First, that the hospitals had a positive role to play within their patient catchment areas, but that this was insufficient to affect national mortality trends decisively. Secondly, the hospitals' influence was of greater importance before the mid-nineteenth century. Despite advances in medical knowledge and techniques, population pressure, overcrowding and the growing incidence of serious cases in hospitals coupled with outbreaks of 'hospital diseases' meant that the results of hospital treatment may have become less impressive. But even then, mortality levels in the hospitals were low and the hospitals did not merit their reputation of being 'gateways to death' or as institutions 'which positively did harm'.  相似文献   
224.
Seasonal patterns of fertility measures: theory and data   总被引:1,自引:0,他引:1  
The distribution of births by month exhibits a seasonal pattern in most populations. The monthly marital fertility rate for an area of Bangladesh provides a good example of the seasonal periodicity. Seasonal patterns of measures of reproduction in a population of married women are considered. Equations are developed that predict the seasonal patterns of these alternative measures under the assumption that the fertility rate (R) follows a trigonometric curve. This is followed by an empirical analysis of the measures in a Bangladesh population that has a pronounced seasonal fertility. The investigation is intended both to validate the theoretical framework developed in the 1st part of the paper as well as to determine whether seasonal variation in actual populations is sufficiently large to affect the alternative measures significantly. 4 measures are considered: pregnancy prevalence (PP)--the proportion of married women who are pregnant at the survey date; mean open birth interval (MOI)--the time from the last live birth to the date of the survey for parous women and from the time of marriage to the date of the survey for nulliparous women; mean closed interval-birth (MCIB)--the mean interval between the last 2 live births for married women who have a birth in the period immediately preceding the survey date; and mean closed interval-woman (MCIW)--the mean interval between the last 2 live births for women who have had at least 2 children by the time of the survey. It is assumed that the seasonal pattern of the fertility rate of a population follows a cosine curve and that there is no trend in annual fertility from year to year. The lag and relative variability of the other measures are considered in comparison with the fertility rate curve. The predictions from this theoretical effort, when compared with observed patterns and trigonometric regression results for each measure in data from Bangladesh, are shown to be quite accurate. The figure and regression results show that R, PP, and MOI have definite seasonal periodicity, but MCIB and MCIW do not display any seasonal patterns. If there is a secular trend in fertility in addition to seasonality, these relationships between the seasonal patterns of the measures may no longer hold. There is a disadvantage to using closed interval measures, for they are unable to detect effects of limiting of childbearing in a population since they are based only on information from women who have births.  相似文献   
225.
226.
Abstract This paper is a study of changes in nuptiality by province in Europe between 1870 and 1960: nuptiality is measured by I(m) a summary measure of the proportions married among women of childbearing age. In each of the approximately 500 provinces of Europe the level of nuptiality increased between 1870 and 1960. In addition, in most countries the differences among provinces diminished over the period, so that the countries were more homogeneous with respect to provincial nuptiality in 1960 than they had been in 1870. Despite this tendency to convergence, traditional regional differences, linked to a common regional history, were often maintained, though within a narrower range.  相似文献   
227.
"One can often gain insight into the aetiology of a disease by relating mortality rates in different areas to explanatory variables. Multiple regression techniques are usually employed, but unweighted least squares may be inappropriate if the areas vary in population size. Also, a fully weighted regression, with weights inversely proportional to binomial sampling variances, is usually too extreme. This paper proposes an intermediate solution via maximum likelihood which takes account of three sources of variation in death rates: sampling error, explanatory variables and unexplained differences between areas. The method is also adapted for logit (death rates), standardized mortality ratios (SMRs) and log (SMRs). Two [United Kingdom] examples are presented."  相似文献   
228.
229.
Summary This paper shows that the Indiana Amish, a high-fertility Anabaptist population, regulate their marital fertility according to their family finances. We linked demographic data from the Indiana Amish Directory with personal property tax records at 5, 15 and 25 years after marriage and found fertility differences by occupation and wealth. Correlations between family size and wealth at the beginning, middle and end of childbearing years were positive. Wealthier women exhibited higher marital fertility, had longer first birth intervals, were older at the birth of their last child, and had larger families than poorer women. Over the past 30 years, marital fertility has remained constant among older women; but birth rates among younger women have been rising rapidly.  相似文献   
230.
In President Carter's National Energy Plan, there are variable factors, including the coal production rate, standards for home insulation and auto mileage, various taxes, but not the population growth rate. The latter factor is considered to be beyond the influence of public policy; it is a constant. This seems irrational to zero population growth proponents, for there are alternatives to continued U.S. population growth, and these alternatives are more readily attainable than some of the elements in Carter's plan. With some national initiatives in population planning, energy use would be considerably less. Thus, the question remains - Why would Carter not deal with the population factor? 1 reason for this is the fact that population planning is a long-term approach; the results are indirect and not reflected immediately in energy comsumption. Yet, a start must be made in the short-term if there are ever to be long-term benefits. Russell Peterson has suggested that Carter could be ignoring the population factor because of "political sensitivity." Carter's people have ignored the population issue, and press coverage following Carter's energy pronouncements has excluded the population factor. In a situation such as this there seems little hope for increased public awareness of the population factor in energy or other public concerns.  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