全文获取类型
收费全文 | 91786篇 |
免费 | 2956篇 |
国内免费 | 3篇 |
专业分类
管理学 | 12605篇 |
民族学 | 551篇 |
人才学 | 25篇 |
人口学 | 7194篇 |
丛书文集 | 515篇 |
教育普及 | 1篇 |
理论方法论 | 9476篇 |
综合类 | 2149篇 |
社会学 | 43301篇 |
统计学 | 18928篇 |
出版年
2023年 | 511篇 |
2021年 | 577篇 |
2020年 | 1520篇 |
2019年 | 2215篇 |
2018年 | 2139篇 |
2017年 | 3221篇 |
2016年 | 2446篇 |
2015年 | 2056篇 |
2014年 | 2645篇 |
2013年 | 18863篇 |
2012年 | 2506篇 |
2011年 | 2325篇 |
2010年 | 2024篇 |
2009年 | 2200篇 |
2008年 | 2113篇 |
2007年 | 1926篇 |
2006年 | 2147篇 |
2005年 | 2308篇 |
2004年 | 2192篇 |
2003年 | 1919篇 |
2002年 | 2009篇 |
2001年 | 2062篇 |
2000年 | 1828篇 |
1999年 | 1733篇 |
1998年 | 1528篇 |
1997年 | 1376篇 |
1996年 | 1341篇 |
1995年 | 1366篇 |
1994年 | 1307篇 |
1993年 | 1301篇 |
1992年 | 1318篇 |
1991年 | 1249篇 |
1990年 | 1226篇 |
1989年 | 1058篇 |
1988年 | 1143篇 |
1987年 | 1010篇 |
1986年 | 917篇 |
1985年 | 1099篇 |
1984年 | 1154篇 |
1983年 | 1023篇 |
1982年 | 943篇 |
1981年 | 860篇 |
1980年 | 812篇 |
1979年 | 886篇 |
1978年 | 781篇 |
1977年 | 711篇 |
1976年 | 657篇 |
1975年 | 629篇 |
1974年 | 525篇 |
1973年 | 443篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
931.
Neera Kuckreja Sohoni Ph.D. 《Gender Issues》1994,14(1):25-35
This article discusses the complexity of developing correlates of female crime in the comparative context of Western and Indian literature. It selectively reviews the findings of American and Indian studies of female crime and concludes with the author’s own findings from a study of 120 women prisoners conducted in a federal women’s prison in India. The author’s main contention is that whereas broad contours of offender profiles can be drawn, it is difficult to draw statistically significant relationships and infer from them predictable variables of criminality. 相似文献
932.
933.
934.
This report summarizes the proceedings of a conference on quantitative methods for assessing the risks of developmental toxicants. The conference was planned by a subcommittee of the National Research Council's Committee on Risk Assessment Methodology 4 in conjunction with staff from several federal agencies, including the U.S. Environmental Protection Agency, U.S. Food and Drug Administration, U.S. Consumer Products Safety Commission, and Health and Welfare Canada. Issues discussed at the workshop included computerized techniques for hazard identification, use of human and animal data for defining risks in a clinical setting, relationships between end points in developmental toxicity testing, reference dose calculations for developmental toxicology, analysis of quantitative dose-response data, mechanisms of developmental toxicity, physiologically based pharmacokinetic models, and structure-activity relationships. Although a formal consensus was not sought, many participants favored the evolution of quantitative techniques for developmental toxicology risk assessment, including the replacement of lowest observed adverse effect levels (LOAELs) and no observed adverse effect levels (NOAELs) with the benchmark dose methodology. 相似文献
935.
The skin is a route of exposure that needs to be considered when conducting a risk assessment. It is necessary to identify the potential for dermal penetration by a chemical as well as to determine the overall importance of the dermal route of exposure as compared with inhalation or oral routes of exposure. The physical state of the chemical, vapor or liquid, the concentration, neat or dilute, and the vehicle, lipid or aqueous, is also important. Dermal risk is related to the product of the amounts of penetration and toxicity. Toxicity involves local effects on the skin itself and the potential for systemic effects. Dermal penetration is described in large part by the permeability constant. When permeability constants are not known, partition coefficients can be used to estimate a chemical's potential to permeate the skin. With these concepts in mind, a tiered approach is proposed for dermal risk assessment. A key first step is the determination of a skin-to-air or skin-to-medium partition coefficient to estimate a potential for dermal absorption. Building a physiologically-based pharmacokinetic (PBPK) model is another step in the tiered approach and is useful prior to classical in vivo toxicity tests. A PBPK model can be used to determine a permeability constant for a chemical as well as to show the distribution of the chemical systemically. A detailed understanding of species differences in the structure and function of the skin and how they relate to differences in penetration rates is necessary in order to extrapolate animal data from PBPK models to the human. A study is in progress to examine anatomical differences for four species. 相似文献
936.
This paper presents empirical evidence that an individual's decision to drive while drunk is negatively affected by the expected full price of driving drunk. The analysis uses a unique data set containing information on self-reported drunk driving matched to state-level drunk driving policies as well as to state excise taxes on beer. These are hypothesized and found to affect drunk driving. Further, we find interesting racial differences but surprisingly small differences by gender in the effect of socioeconomic and policy variables on drunk driving propensities. 相似文献
937.
J. Richard Udry 《Demography》1994,31(4):561-573
I explain a biosocial model of women’s gendered behavior (behavior on which the sexes differ). This model integrates a macro sociological theory with a biological theory derived from primate behavior. The sociological model is designed to explain changes in the relationship between sex and behavior over time or between groups. The biological model is designed to explain individual within-sex variance and between-sex variance in gendered behavior in a cohort. Results from an original study are presented to demonstrate that within-sex variance in women’s gendered behavior is explained well by the primate model. I conclude that human nature is gendered. The implications of this conclusion are explored for demographic and other social science research. 相似文献
938.
Marriage and fertility in the United States have become less firmly entwined as more women bear children without marrying and more couples with children divorce. Today a sizeable number of children are expected to spend a portion of their childhood in one-parent households. Despite the trends in illegitimacy and divorce, the actual effect of out-of-wedlock childbearing on the living arrangements of children has not been fully explicated. Using the National Survey of Family Growth Cycle III, this paper estimates the probability that children aged 0–13 in 1982 are living in two-parent households, controlling for their mothers' marital statuses at their births. We find that marital status at birth is an important predictor of household structure at later ages for both white and black populations; however, the childhood environment is actually quite elastic as women marry, divorce, remarry, and redivorce. 相似文献
939.
Mark L. Savickas 《The Career development quarterly》1991,39(4):315-324
Examining concepts about work and love can help people increase their career success and life satisfaction. Career counselors may initiate this examination by eliciting clients' concepts about work and love. After hearing a client's ideas about work and love, counselors can compare this personal meaning to the social meaning of work and love. When this comparison reveals dysfunctional beliefs about work and love, counselors can link these beliefs to their client's career concerns. Such a linkage typically provokes a cognitive dissonance that motivates clients to modify their beliefs. Counselors can facilitate meaning modification by using client-centered and social influence techniques. 相似文献
940.
James A. Yunker 《Economic inquiry》1994,32(4):597-615
A small-scale general equilibrium model in which the distribution of capital wealth is a key parameter is employed to examine the potential economic consequences of greater capital wealth equality. Every performance indicator examined – aggregate income, consumption equality, social welfare in the sum-of-utilities sense, and aggregate saving –is improved by greater capital wealth equality. However, the bottom-line social welfare gain, relative to the present high-inequality situation – even from the maximum achievable level of complete equality in capital wealth distribution – would be numerically rather modest. 相似文献