全文获取类型
收费全文 | 7713篇 |
免费 | 143篇 |
国内免费 | 1篇 |
专业分类
管理学 | 1032篇 |
民族学 | 35篇 |
人口学 | 792篇 |
丛书文集 | 33篇 |
理论方法论 | 709篇 |
综合类 | 96篇 |
社会学 | 3722篇 |
统计学 | 1438篇 |
出版年
2023年 | 43篇 |
2020年 | 105篇 |
2019年 | 162篇 |
2018年 | 192篇 |
2017年 | 279篇 |
2016年 | 195篇 |
2015年 | 138篇 |
2014年 | 176篇 |
2013年 | 1355篇 |
2012年 | 240篇 |
2011年 | 221篇 |
2010年 | 155篇 |
2009年 | 138篇 |
2008年 | 155篇 |
2007年 | 149篇 |
2006年 | 176篇 |
2005年 | 157篇 |
2004年 | 151篇 |
2003年 | 140篇 |
2002年 | 160篇 |
2001年 | 166篇 |
2000年 | 173篇 |
1999年 | 178篇 |
1998年 | 139篇 |
1997年 | 135篇 |
1996年 | 129篇 |
1995年 | 110篇 |
1994年 | 108篇 |
1993年 | 112篇 |
1992年 | 118篇 |
1991年 | 128篇 |
1990年 | 125篇 |
1989年 | 144篇 |
1988年 | 85篇 |
1987年 | 109篇 |
1986年 | 93篇 |
1985年 | 114篇 |
1984年 | 96篇 |
1983年 | 103篇 |
1982年 | 82篇 |
1981年 | 83篇 |
1980年 | 76篇 |
1979年 | 81篇 |
1978年 | 83篇 |
1977年 | 60篇 |
1976年 | 66篇 |
1975年 | 62篇 |
1974年 | 59篇 |
1973年 | 49篇 |
1971年 | 41篇 |
排序方式: 共有7857条查询结果,搜索用时 0 毫秒
1.
2.
3.
4.
Diane Hope Weixing Zhu Corinna Gries Jacob Oleson Jason Kaye Nancy B. Grimm Lawrence A. Baker 《Urban Ecosystems》2005,8(3-4):251-273
We explored variations in inorganic soil nitrogen (N) concentrations across metropolitan Phoenix, Arizona, and the surrounding
desert using a probability-based synoptic survey. Data were examined using spatial statistics on the entire region, as well
as for the desert and urban sites separately. Concentrations of both NO3-N and NH4-N were markedly higher and more heterogeneous amongst urban compared to desert soils. Regional variation in soil NO3-N concentration was best explained by latitude, land use history, population density, along with percent cover of impervious
surfaces and lawn, whereas soil NH4-N concentrations were related to only latitude and population density. Within the urban area, patterns in both soil NO3-N and NH4-N were best predicted by elevation, population density and type of irrigation in the surrounding neighborhood. Spatial autocorrelation
of soil NO3-N concentrations explained 49% of variation among desert sites but was absent between urban sites. We suggest that inorganic
soil N concentrations are controlled by a number of ‘local’ or ‘neighborhood’ human-related drivers in the city, rather than
factors related to an urban-rural gradient. 相似文献
5.
We describe a risk-based analytical framework for estimating traffic fatalities that combines the probability of a crash and the probability of fatality in the event of a crash. As an illustrative application, we use the methodology to explore the role of vehicle mix and vehicle prevalence on long-run fatality trends for a range of transportation growth scenarios that may be relevant to developing societies. We assume crash rates between different road users are proportional to their roadway use and estimate case fatality ratios (CFRs) for the different vehicle-vehicle and vehicle-pedestrian combinations. We find that in the absence of road safety interventions, the historical trend of initially rising and then falling fatalities observed in industrialized nations occurred only if motorization was through car ownership. In all other cases studied (scenarios dominated by scooter use, bus use, and mixed use), traffic fatalities rose monotonically. Fatalities per vehicle had a falling trend similar to that observed in historical data from industrialized nations. Regional adaptations of the model validated with local data can be used to evaluate the impacts of transportation planning and safety interventions, such as helmets, seat belts, and enforcement of traffic laws, on traffic fatalities. 相似文献
6.
The Coase theorem maintains that where free-market precepts exist, the allocation of property rights does not impact the distribution of resources. An application to Major League Baseball suggests that institutions such as free agency and the reverse-order amateur draft would not impact player distributions and therefore would not impact competitive balance. The present study finds that the distribution of wins is generally consistent with the precepts of the Coase theorem and therefore suggests a course for those who wish to alter the level of competitive balance: Major League Baseball should increase its focus on expanding the size of its labor pool. (JEL O15 , L83 , C22 ) 相似文献
7.
UNDERSTANDING THE DECISION TO PARTICIPATE IN A SURVEY 总被引:18,自引:1,他引:17
The lack of full participation in sample surveys threatens theinferential value of the survey method. We review a set of conceptualdevelopments and experimental findings that appear to be informativeabout causes of survey participation; offer an integration ofthat work with findings from the more traditional statisticaland survey methodological literature on nonresponse; and, giventhe theoretical structure, deduce potentially promising pathsof research toward the understanding of survey participation. 相似文献
8.
9.
Joshua Gamson 《Sociological Forum》1996,11(2):231-261
Using information gathered during fieldwork on New York lesbian and gay film festival organizations, this paper argues that
scholarship on identity has not paid sufficient attention to the organizational mediation of collective identity. The shape
of collective identity—how internal instabilities and diversities are accommodated, in this case—depends not only on the emergent
characteristics of the “collective,” but also on the resolution of challenges particular to organizational fields. Two very
differently conceived lesbian and gay festival organizations, sites at which decision making about collective identity is
ongoing and self-conscious, are examined. The analysis traces how each responds to two related tasks: maintaining community
legitimacy, which requires racial diversification, and surviving within an altered institutional environment. Rather than
imposition from “above” or construction from “below,” the adaptive responses by organizations (to changes in both community
expectations and the resource environment) transform the collective identity formulations reaching public visibility.
Earlier versions of this paper were presented at the Colloquium Series of the Center for Lesbian and Gay Studies, City University
of New York, 1995, and at the Annual Meeting of the American Sociological Association, Washington, DC, 1995. 相似文献
10.
This study examines the influence of the socialization of aggression among different gender and social class groupings and the influence of psychosocial stage on cognitive developmental play preferences among groups of school aged children. Observations of 143 play groups were coded for play preference (symbolic play, practice play, games with rules) and play performance (cooperative or competitive). Findings of the log-linear data analysis suggest a middle class and masculine bias in Piaget's cognitive model (i.e., that as age increases children prefer more games with rules). This model held only for middle class and affluent boys. Girls (both latency and prepubertal) and lower socioeconomic groups tended to prefer practice play. Girls were more likely to play cooperatively; boys more likely to play competitively. Implications for theory development and clinical practice are explored. 相似文献