全文获取类型
收费全文 | 91159篇 |
免费 | 1956篇 |
国内免费 | 3篇 |
专业分类
管理学 | 12358篇 |
民族学 | 531篇 |
人才学 | 25篇 |
人口学 | 6946篇 |
丛书文集 | 525篇 |
教育普及 | 2篇 |
理论方法论 | 9392篇 |
综合类 | 2124篇 |
社会学 | 42449篇 |
统计学 | 18766篇 |
出版年
2023年 | 511篇 |
2021年 | 569篇 |
2020年 | 1498篇 |
2019年 | 2204篇 |
2018年 | 2054篇 |
2017年 | 3129篇 |
2016年 | 2355篇 |
2015年 | 2040篇 |
2014年 | 2615篇 |
2013年 | 18818篇 |
2012年 | 2334篇 |
2011年 | 2115篇 |
2010年 | 1923篇 |
2009年 | 2170篇 |
2008年 | 2005篇 |
2007年 | 1833篇 |
2006年 | 2040篇 |
2005年 | 2295篇 |
2004年 | 2189篇 |
2003年 | 1859篇 |
2002年 | 1969篇 |
2001年 | 2014篇 |
2000年 | 1791篇 |
1999年 | 1709篇 |
1998年 | 1496篇 |
1997年 | 1349篇 |
1996年 | 1317篇 |
1995年 | 1333篇 |
1994年 | 1309篇 |
1993年 | 1286篇 |
1992年 | 1294篇 |
1991年 | 1228篇 |
1990年 | 1206篇 |
1989年 | 1054篇 |
1988年 | 1133篇 |
1987年 | 1007篇 |
1986年 | 911篇 |
1985年 | 1065篇 |
1984年 | 1156篇 |
1983年 | 1028篇 |
1982年 | 958篇 |
1981年 | 864篇 |
1980年 | 819篇 |
1979年 | 888篇 |
1978年 | 782篇 |
1977年 | 701篇 |
1976年 | 656篇 |
1975年 | 634篇 |
1974年 | 529篇 |
1973年 | 455篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
451.
Warren C. Robinson 《Revue europeenne de demographie》2002,18(2):153-173
This paper argues that the generally-held belief that there was no population policy in Great Britain during its fertility transition is incorrect. There were, in fact, clear and implicit and explicit policies in place by the early 19th Century which aimed at reducing population growth. These were negative, involving elimination of family allowances (the famous Poor Laws), and also positive, through subsidised emigration and ``transportation' of felons to the colonies. Moreover, a changed ``ideation' on the part of the nation's political, intellectual and spiritual leaders, changed norms about marriage and child-bearing, raising sharply the perceived economic and psychic cost of children. Lacking acceptable means to control pregnancies, many working class women resorted to abortion, infanticide and child abandonment to reduce their family size. The policy's actual impact on overall fertility is uncertain but it did constitute a deliberate attempt by society to affect demographic behaviour and outcomes. 相似文献
452.
453.
I. M. Endresen B. Ellertsen C. Endresen A. M. Hjelmen R. Matre H. Ursin 《Work and stress》1991,5(3):217-227
This study concerned the immunological correlates of stress and work. Self reported stress, emotional state, ego-strength, and defensiveness were examined in relation to measures of cellular immunity (T-cell response to Con A and number of T4 and T8 cells) and humoral immunity (concentrations of immunoglobulins and complement components in plasma) in a group of 96 Norwegian female bank employees. The analyses showed that workload, the stress factor with the highest group mean, was associated with number of T-cells, while strain due to body posture during work was related to concentrations of IgM and C3. Further, depression was significantly correlated with IgM concentration and T-cell number, and anxiety with C3 concentration. T-cell activity was the immunological parameter most consistently associated with psychological well-being, showing positive correlations with defensiveness and ego-strength and negative correlations with anxiety and depression. In conclusion, T-cell number and concentrations of IgM and C3 were sensitive to both work-related stress experience and emotional distress. Coping abilities, indicated by the MMPI Ego-strength scale and emotional distress, were reflected in T-cell activity; insufficient coping was associated with low T-cell activity. 相似文献
454.
林业发展阶段研究概述 总被引:2,自引:0,他引:2
阶段性是事物发展必须遵循的一个客观规律,林业的发展同样也具有阶段性.只有充分认识各个时期林业发展所处的历史阶段和相应特征,才能更好地制定政策和发展战略.该文将以往的林业方面的阶段性研究加以综述,以期获得收益和启发,并为以后的研究打下基础. 相似文献
455.
The completely random character of radioactive disintegration provides the basis of a strong justification for a Poisson linear model for single-photon emission computed tomography data, which can be used to produce reconstructions of isotope densities, whether by maximum likelihood or Bayesian methods. However, such a model requires the construction of a matrix of weights, which represent the mean rates of arrival at each detector of photons originating from each point within the body space. Two methods of constructing these weights are discussed, and reconstructions resulting from phantom and real data are presented. 相似文献
456.
The physical and psychological effects of Turner's Syndrome, a female sex chromosome abnormality, briefly are described. Principles for helping women master the special challenges posed by the disorder are discussed. The authors argue that women with TS must take control of defining their identities and potential in order to attain full status within society. 相似文献
457.
458.
459.
460.