全文获取类型
收费全文 | 30593篇 |
免费 | 827篇 |
国内免费 | 1篇 |
专业分类
管理学 | 4025篇 |
民族学 | 160篇 |
人才学 | 1篇 |
人口学 | 2723篇 |
丛书文集 | 146篇 |
教育普及 | 3篇 |
理论方法论 | 2806篇 |
综合类 | 501篇 |
社会学 | 15428篇 |
统计学 | 5628篇 |
出版年
2023年 | 190篇 |
2021年 | 196篇 |
2020年 | 509篇 |
2019年 | 715篇 |
2018年 | 830篇 |
2017年 | 1117篇 |
2016年 | 868篇 |
2015年 | 620篇 |
2014年 | 797篇 |
2013年 | 5270篇 |
2012年 | 1061篇 |
2011年 | 957篇 |
2010年 | 678篇 |
2009年 | 606篇 |
2008年 | 773篇 |
2007年 | 733篇 |
2006年 | 707篇 |
2005年 | 721篇 |
2004年 | 683篇 |
2003年 | 595篇 |
2002年 | 608篇 |
2001年 | 727篇 |
2000年 | 656篇 |
1999年 | 658篇 |
1998年 | 491篇 |
1997年 | 437篇 |
1996年 | 471篇 |
1995年 | 450篇 |
1994年 | 422篇 |
1993年 | 408篇 |
1992年 | 498篇 |
1991年 | 493篇 |
1990年 | 467篇 |
1989年 | 432篇 |
1988年 | 403篇 |
1987年 | 363篇 |
1986年 | 394篇 |
1985年 | 399篇 |
1984年 | 399篇 |
1983年 | 376篇 |
1982年 | 300篇 |
1981年 | 252篇 |
1980年 | 281篇 |
1979年 | 311篇 |
1978年 | 257篇 |
1977年 | 219篇 |
1976年 | 178篇 |
1975年 | 182篇 |
1974年 | 177篇 |
1973年 | 149篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
The histories and service needs of 2 groups of homeless women, those unaccompanied by minor children (n = 46) and those accompanied by minor children (n = 22), were compared, on the basis of their responses to a biennial survey of homeless people in a midsize city in the southeast United States. Mothers of children aged 2–10 also completed a measure of stress symptoms for their children (n = 20). Irrespective of family status group, problems such as substance abuse, history of mental illness, health problems, chronicity of homelessness, and crime victimization tended to cluster together. The findings also suggest that declining and/or inadequate levels of public benefits, Temporary Assistance to Needy Families, and Medicaid-funded health care in particular, have adversely affected the 2 groups, particularly families with children. The young children in this sample experienced elevated levels of stress, and significant associations were found between children's stress levels and certain risk factors of their mothers. Implications for service delivery are discussed. 相似文献
32.
Schmidt Philip R. 《Sociological Practice: A Journal of Clinical and Applied Sociology》2002,4(3):195-208
The historical relationship between the electoral college and controversial U.S. presidential elections, specifically with respect to conflict, is examined. The elections of 1800, 1824, 1860, 1876, 1888, 1968, and 2000 are examined. Aside from the 2000 election, there has been essentially no conflict in American history due to the electoral college. The constitutional structure and thinking behind the form of the electoral college is given, with emphasis on the federal aspects of the structure. The current movement to abolish the electoral college in favor of direct popular vote is depicted, along with the arguments against making that change. The conclusion is that we as a nation are far better off to retain the status quo than to make the called-for change. 相似文献
33.
Susan D. Calkins Susan E. Dedmon Kathryn L. Gill Laura E. Lomax Laura M. Johnson 《Infancy》2002,3(2):175-197
A study sample of 162 six‐month‐old children was selected from a larger sample of 346 infants on the basis of parents' report of their infants' temperament and a laboratory assessment of temperament. Infants were classified as easily frustrated and less easily frustrated and compared on a number of emotion regulation, physiology, and temperament measures. Results indicated that male and female infants were equally likely to be classified as frustrated and less easily frustrated; however, male infants were less able to regulate physiologically. Easily frustrated infants used different emotion regulation strategies and were observed to be less attentive and more active than less easily frustrated infants when observed in the laboratory. These infants were also characterized by their parents as more active, less attentive, and more distressed to novelty. Infants classified as easily frustrated were more reactive physiologically and less able to regulate physiological reactivity than their less easily frustrated counterparts. It is hypothesized that this cluster of characteristics may constitute a unique temperamental type that may have implications for other types of behavioral functioning. Limitations of the study are that observations are based on a single brief assessment of the infant, modest effect sizes were found, and the study is cross‐sectional. 相似文献
34.
A.M. Mathai 《Revue canadienne de statistique》1993,21(3):277-283
The product of two independent or dependent scalar normal variables, sums of products, sample covariances, and general bilinear forms are considered. Their distributions are shown to belong to a class called generalized Laplacian. A growth-decay mechanism is also shown to produce such a generalized Laplacian. Sets of necessary and sufficient conditions are derived for bilinear forms to belong to this class. As a generalization, the distributions of rectangular matrices associated with multivariate normal random vectors are also discussed. 相似文献
35.
36.
37.
38.
What do voters really know about party platforms and how do they perceive the contents? Are there any relationships between party election platforms and electoral behavior? Despite of much research on parties, there are hardly any answers to these questions. If political parties devise programmes in order to influence political attitudes or electoral behavior, it will be necessary that these programmes are read by people. But it seems to be unclear if and how people do so. This article shows clearly that voters don’t know much about party manifestoes. Still, programmes are more important for voters than many people believe. Programmes are also an important factor for electoral behavior. But there is still a lack of data to get evident results. 相似文献
39.
40.
Using an increasing returns specification for distribution, an inverted U pattern between the share of distribution in gross domestic product and the level of development is shown to arise. A cross-section time-series data set is constructed and merged with one used to analyze the service sector. In contrast to the rising pattern found for services, an average time-series relation that exhibits an inverted U pattern is established. The empirical results are robust, for example, to choice of functional form and country and time period coverage. A similar pattern is found in the average cross-section (country) relation between distribution and development. 相似文献