全文获取类型
收费全文 | 2799篇 |
免费 | 180篇 |
专业分类
管理学 | 280篇 |
民族学 | 48篇 |
人口学 | 321篇 |
丛书文集 | 16篇 |
理论方法论 | 237篇 |
综合类 | 74篇 |
社会学 | 1433篇 |
统计学 | 570篇 |
出版年
2024年 | 5篇 |
2023年 | 46篇 |
2022年 | 43篇 |
2021年 | 58篇 |
2020年 | 128篇 |
2019年 | 128篇 |
2018年 | 229篇 |
2017年 | 255篇 |
2016年 | 204篇 |
2015年 | 117篇 |
2014年 | 148篇 |
2013年 | 499篇 |
2012年 | 237篇 |
2011年 | 111篇 |
2010年 | 93篇 |
2009年 | 88篇 |
2008年 | 94篇 |
2007年 | 67篇 |
2006年 | 60篇 |
2005年 | 49篇 |
2004年 | 37篇 |
2003年 | 43篇 |
2002年 | 35篇 |
2001年 | 35篇 |
2000年 | 17篇 |
1999年 | 11篇 |
1998年 | 12篇 |
1997年 | 11篇 |
1996年 | 8篇 |
1995年 | 10篇 |
1994年 | 10篇 |
1993年 | 5篇 |
1992年 | 9篇 |
1991年 | 7篇 |
1990年 | 7篇 |
1989年 | 10篇 |
1988年 | 9篇 |
1987年 | 4篇 |
1986年 | 8篇 |
1985年 | 5篇 |
1984年 | 3篇 |
1981年 | 2篇 |
1979年 | 2篇 |
1978年 | 4篇 |
1977年 | 2篇 |
1975年 | 2篇 |
1973年 | 3篇 |
1972年 | 1篇 |
1971年 | 2篇 |
1967年 | 1篇 |
排序方式: 共有2979条查询结果,搜索用时 15 毫秒
961.
Moreno-Contreras Israel Gómez de Silva Héctor Andrade-González Violeta Vital-García Cuauhcihuatl Ortiz-Ramírez Marco F. 《Urban Ecosystems》2019,22(5):893-906
Urban Ecosystems - Urban green spaces have been shown to be important hotspots of biodiversity in cities of temperate and humid/semihumid tropical ecoregions. Nonetheless, whether this pattern... 相似文献
962.
Anton Johannes Veldhuis Jane Glover David Bradley Kourosh Behzadian Alma López-Avilés Julian Cottee 《生产规划与管理》2019,30(7):593-609
AbstractAddressing the intersection of two important emerging research areas, re-distributed manufacturing (RDM) and the food-energy-water (FEW) nexus, this work combines insights from engineering, business and policy perspectives and explores opportunities and challenges towards a more localized and sustainable food system. Analysis centred on two specific food products, namely bread and tomato paste reveals that the feasibility and potential of RDM vary with the type of food product and the supply chain (SC) components. Physically, energy efficiency, water consumption and reduction of waste and carbon footprint may be affected by scale and location of production activities and potentials of industrial symbiosis. From the business perspective, novel products, new markets and new business models are expected in order for food RDM to penetrate within the established food industry. Studies on policies, through the lens of public procurement, call for solid evidence of envisioned environmental, social and economic benefits of a more localized food system. An initial integrated framework is proposed for understanding and assessing food RDM and the FEW nexus. 相似文献
963.
In this article, we propose a new way of understanding presidential election outcomes in red and blue states in 2000 and 2004, one that takes into account state‐level variation in postmodern family patterns. Using data from the Statistical Abstract, Census, the American Community Survey, and National Vital Statistics Reports, we construct two measures of state patterns of postmodern family formation (a father‐absent family scale, and a small/delayed family scale). We find that these patterns of postmodern family formation are powerful predictors of states' percentage of votes cast for the Democratic candidate in 2000 and 2004, even after controlling for differences in the composition of states' populations and for differences in states' economic characteristics (rates of economic growth, unemployment, and poverty). We suggest ways that this approach could contribute to the literature on how individual‐level factors, such as demographic characteristics and moral values, shape voting behavior and electoral outcomes. 相似文献
964.
The article gives a graphical interpretation of the concept of risk vulnerability. It shows that in a specific context of
binary lotteries the assumption of risk vulnerability adds to prudence what the assumption of decreasing absolute risk aversion
adds to risk aversion. We end the presentation showing that results can be extended to the concept of multiplicative risk
vulnerability. 相似文献
965.
Rafael Muñoz de Bustillo José-Ignacio Antón 《Population research and policy review》2011,30(5):661-676
This article for first time explores the relationship between immigration and poverty in Spain. Using recent Spanish household
surveys, it is found, first, that both moderate and severe poverty are more acute among immigrants than among nationals and
social transfers play no substantial role in reducing monetary deprivation in the case of foreign-born population; in the
second place, we perform an econometric analysis that shows that the different poverty risk faced by local and immigrant households
is not driven by differences in basic household and demographic characteristics. 相似文献
966.
Roland Langrock Thomas Kneib Richard Glennie Théo Michelot 《Statistics and Computing》2017,27(1):259-270
We consider Markov-switching regression models, i.e. models for time series regression analyses where the functional relationship between covariates and response is subject to regime switching controlled by an unobservable Markov chain. Building on the powerful hidden Markov model machinery and the methods for penalized B-splines routinely used in regression analyses, we develop a framework for nonparametrically estimating the functional form of the effect of the covariates in such a regression model, assuming an additive structure of the predictor. The resulting class of Markov-switching generalized additive models is immensely flexible, and contains as special cases the common parametric Markov-switching regression models and also generalized additive and generalized linear models. The feasibility of the suggested maximum penalized likelihood approach is demonstrated by simulation. We further illustrate the approach using two real data applications, modelling (i) how sales data depend on advertising spending and (ii) how energy price in Spain depends on the Euro/Dollar exchange rate. 相似文献
967.
Usual fitting methods for the nested error linear regression model are known to be very sensitive to the effect of even a single outlier. Robust approaches for the unbalanced nested error model with proved robustness and efficiency properties, such as M-estimators, are typically obtained through iterative algorithms. These algorithms are often computationally intensive and require robust estimates of the same parameters to start the algorithms, but so far no robust starting values have been proposed for this model. This paper proposes computationally fast robust estimators for the variance components under an unbalanced nested error model, based on a simple robustification of the fitting-of-constants method or Henderson method III. These estimators can be used as starting values for other iterative methods. Our simulations show that they are highly robust to various types of contamination of different magnitude. 相似文献
968.
Body Image Disturbances and Predictors of Body Dissatisfaction Among Hispanic and White Preadolescents
下载免费PDF全文
![点击此处可从《Journal of research on adolescence》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Norma Olvera Kendall McCarley Augusto X. Rodriguez Nausheen Noor María A. Hernández‐Valero 《Journal of research on adolescence》2015,25(4):728-738
This study assessed ethnic and gender differences in ideal body size, body dissatisfaction (BD), and the relationship between BD and various predictors (e.g., body composition indicators and cardiorespiratory fitness). The sample consisted of 190 White and Hispanic preadolescents aged 10–13 years. Demographic, percent body fat (%BF), body mass index (BMI), body image variables, and cardiorespiratory fitness (CRF) were examined. A significant Gender × Ethnicity interaction was found for ideal body size (p < .05), with Hispanic girls preferring the thinnest figures and Hispanic boys the largest figures, compared to their counterparts. No significant gender or ethnic differences in BD were observed. After controlling for demographic and cultural variables, increased %BF and BMI scores predicted greater BD, whereas CRF did not. 相似文献
969.
970.