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   13496篇
  免费   195篇
  国内免费   18篇
管理学   1644篇
民族学   83篇
人才学   1篇
人口学   1145篇
丛书文集   144篇
理论方法论   1226篇
综合类   728篇
社会学   7048篇
统计学   1690篇
  2023年   91篇
  2022年   67篇
  2021年   112篇
  2020年   230篇
  2019年   283篇
  2018年   335篇
  2017年   482篇
  2016年   326篇
  2015年   268篇
  2014年   312篇
  2013年   2059篇
  2012年   482篇
  2011年   464篇
  2010年   394篇
  2009年   331篇
  2008年   401篇
  2007年   413篇
  2006年   416篇
  2005年   362篇
  2004年   287篇
  2003年   255篇
  2002年   268篇
  2001年   338篇
  2000年   281篇
  1999年   274篇
  1998年   201篇
  1997年   169篇
  1996年   158篇
  1995年   176篇
  1994年   162篇
  1993年   164篇
  1992年   185篇
  1991年   188篇
  1990年   183篇
  1989年   159篇
  1988年   167篇
  1987年   191篇
  1986年   147篇
  1985年   158篇
  1984年   175篇
  1983年   152篇
  1982年   151篇
  1981年   122篇
  1980年   111篇
  1979年   122篇
  1978年   96篇
  1977年   79篇
  1976年   93篇
  1975年   109篇
  1974年   84篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
Summary In Matlab Bazaar Thana the Cholera Research Laboratory has registered the births, deaths and migrations in a population of approximately 125,000 since 1966. Although this rural area was not the scene of any significant armed encounters, striking changes in birth and death rates were registered during and after the conflict. Birth rates did not change during the relatively brief period of the civil war, but a small decline was registered for one year after the war. Fertility rates which had been declining slightly and irregularly in the pre-war baseline period may have increased slightly during the war and fell substantially in all age groups in the year following the war. The crude death rate, which rose by 37 per cent during the war, was a very sensitive reflection of the administrative and economic problems. Overall infant mortality rose by only 15 per cent over pre-war levels because all of the increase was observed in the post-neo-natal component, which traditionally accounts for less than one-third of the total infant mortality in Bangladesh. Children and older adults accounted for the majority of excess deaths which were largely attributed to acute diarrhoeas and other gastro-intestinal causes. The death rate at ages 1-4 rose by 43 per cent and at ages 5-9 soared to 208 per cent above pre-war baseline rates. All increases in age-specific mortality rates fell to baseline levels during the year following the war, except the 5-9-year age group, in which rates continued to be high largely because of deaths due to dysentery.  相似文献   
992.
Age at marriage and timing of the first birth   总被引:1,自引:0,他引:1  
Summary An attempt has been made to measure the effect of age at marriage of brides on the timing of the first birth. In Australian vital statistics, first nuptial confinements have been tabulated by age of mothers and by single years of marriage duration in single months for the first two years and by single years for all other durations since 1916. A simple technique has been used to link such data with marriage cohorts. The study briefly reviews the prevailing patterns of the timing of first births by mothers' age at marriage and changes in this pattern since the marriages of the 1925/9 period. The analysis shows that after a period of relative stability of family formation patterns in the 1950s and early 1960s, women married in the late 1960s started postponing the first birth beyond the first two years of marriage. It is suggested that a fraction of the decline in total births recorded in Australia since 1972 can be attributed to the postponement of first nuptial confinements by women married in the late 1960s and early 1970s.  相似文献   
993.
In this study a measure of economic status, money value of consumption, is defined and its relationship to income is examined using data collected from 628 U.S. rural families and 1170 North Carolina rural families. Findings suggest that for rural families money value of consumption is linearly related to income, that the variance of money value of consumption is proportional to income and that money value of consumption is more equally distributed than income. Money value of consumption is more closely related to income for one-and four-or-more-person families than for two-or-three-person families. A comparison of how the two measures (money value of comsumption and income) rank rural families by consumption status indicates that income is most likely to rank families inaccurately at very low and very high levels of income. Findings should assist in the appropriate interpretation of income when it is used as a proxy for consumption.  相似文献   
994.
Drawing upon a sample of 638 mothers aged 18 to 40, with at least some marital work experience, significant associations were found between the extent, kind, and timing of employment and a series of family formation variables. Generally lower fertility, longer first birth intervals, and earlier use of birth control were associated with the longest work durations, the highest status jobs, and work before the birth of the first child. The data failed, however, to differentiate desired family size.  相似文献   
995.
Measures of occupational differentiation in each of eight industries vary markedly among the states of Mexico, a finding that is construed as evidence of territorial divergence in economic development. The relation among states between the relative size of an industry and the amount of occupational differentiation is direct for some industries but inverse for others. The interpretation is that industry size and intraindustry division of labor are directly related only to the extent that the labor force is concentrated territorially. Findings for the states of Mexico 1950 and 1960 are consistent with the interpretation.  相似文献   
996.
On long-term mortality trends in the United States, 1850–1968   总被引:1,自引:0,他引:1  
S. L. N. Rao 《Demography》1973,10(3):405-419
This study of United States life tables analyzes the process of mortality transition during 1850–1968. Special features of the study are (1) a phase-specific, rather than an age-specific, analysis of mortality and (2) use of measures based on person-years of life (nL x ) in phase-intervals, rather than survival rates (nPx) or expectation of life at given ages (e x o). The analysis suggests that the historical transition of mortality in the United States can be described as a three-stage process: an initial stage of slow improvement in life expectancy during 1850–1900, a second stage of rapid improvement during 1900–1950, and a third stage of slower improvement since 1950. Quantitative measures of rapidity of mortality decline in the several phases indicate that they are not identical for all phases and in all stages. The analysis also suggests that there have been rapid changes in the components of overall mortality differentials by sex and race in the United States. The paper draws attention to the need for studies of factors in variations of mortality at ages beyond 50 in the United States population subgroups.  相似文献   
997.
Abstract In order to match birth and family planning acceptance records and thereby to obtain estimates of pre- and post-acceptance fertility, use is made of seven-digit national identity card numbers, issued to all adult West Malaysians. These unique numbers are recorded on live-birth records and national family planning programme acceptor records of West Malaysian women. The application and preliminary results of this method of direct computer matching of these sets of records for assessing the effects of a family planning programme on fertility are described. Pre- and post-acceptance fertility rates are presented in terms of contraceptive methods used, and the key characteristics of race and age of programme acceptors, and are discussed in terms of marital duration and number of children at the time of acceptance.  相似文献   
998.
Abstract Sierra Leone is in a position typical of many African countries regarding accurate information on her basic demographic characteristics. Such vital registration as exists is confined to a small area and there has been only one census of any reliability, that of 1963. Estimates of fertility levels from the age distribution obtained from that enumeration have been made by Dow, the method having been used previously by Van de Walle for Nigeria.  相似文献   
999.
Discussions of birth rates in less developed countries (LDC’s) are almost always couched in terms of income per-capita or per-consumer-equivalent. A decrease in population growth rate is said to lead to a higher per-capita income (PCI) than would occur with a higher birth rate, and therefore a lower birth rate is advocated. This runs the danger of choosing a course of action that people really do not want. A static analysis of a PCI criterion leads to an optimum which is quite unacceptable. One can raise the PCI of any given group by getting rid of all small sub-groups that have a lower PCI. Static analysis is not directly relevant to those problems of LDC’s, because the relevant control variable is the birth rate. This paper explores some of the ramifications of different birth rates. The general conclusion is that per-capita income alone cannot be a satisfactory criterion for a rational national natality policy. At best it can be but one factor to be taken into consideration in such a policy decision.  相似文献   
1000.
Male and female participants were surveyed on abortion attitudes, commitment, and abortion experience. Results revealed a normal distribution of abortion attitudes rejecting the notion that the vast majority of the sample would have significantly pro-choice views. No significant difference was found in overall abortion attitudes of males vs. females, however, individuals with direct abortion experience were found to have significantly stronger pro-choice attitudes than individuals without direct abortion experience. Overall, college students reported a moderate degree of commitment to the issue of abortion. Females were significantly more committed than males, individuals with direct abortion experience were significantly more committed than individuals without direct abortion experience, and individuals with more extreme abortion attitudes were significantly more committed than those with weaker, more ambivalent, attitudes. No significant difference was found in level of commitment between pro-choice and pro-life individuals.  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