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Barro-type endogenous growth models propose a nonmonotonic relationship between productive public spending and growth. Under this so-called nonlinearity hypothesis the size and direction of growth effects due to an increase in public spending depend on the share of public spending in GDP. Employing German time-series data we examine the validity of the nonlinearity hypothesis. We estimate growth effects by using models whose coefficients are allowed to vary with the share of public spending in GDP. Our results support the hypothesis for public consumption but not for public investment data. (JEL H54 , E62 , C22 ) 相似文献
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Matthias Neumann Christian Hirsch Jakub Stank Viktor Bene Volker Schmidt 《Scandinavian Journal of Statistics》2019,46(3):848-884
We investigate the problem of estimating geodesic tortuosity and constrictivity as two structural characteristics of stationary random closed sets. They are of central importance for the analysis of effective transport properties in porous or composite materials. Loosely speaking, geodesic tortuosity measures the windedness of paths, whereas the notion of constrictivity captures the appearance of bottlenecks resulting from narrow passages within a given materials phase. We first provide mathematically precise definitions of these quantities and introduce appropriate estimators. Then, we show strong consistency of these estimators for unboundedly growing sampling windows. In order to apply our estimators to real data sets, the extent of edge effects needs to be controlled. This is illustrated using a model for a multiphase material that is incorporated in solid oxide fuel cells. 相似文献
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Victor Neumann 《Intercultural Education》1997,8(1):19-35
The county of Banat is situated in the western extremity of Romania, an area where several populations cohabit: Romanians, Germans, Magyars, Serbs, Croats, Jews, Bulgarians, Slovaks, Bohemians, Roma (Gypsies) and Turks. This region is also the site of confessional encounters between Orthodox Christians, Catholics, Calvinists, Jews and Muslims. The society that has developed in Banat from the 18th century onwards is the product of an exchange of opinions and material values. This study examines these phenomena historically and at present, as well as the resulting consequences for intercultur‐ally oriented education today. The paper focuses on the following topics: the past and the present of the multi‐ethnic, multi‐linguistic, and multi‐confessional configuration of the region, social intercourse between the majority and minorities and between minorities, the educational significance of interculturalism in Banat County and in Romania. The paper also suggests ways in which intercultural education might be promoted. 相似文献
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Olivier Bargain Mathias Dolls Herwig Immervoll Dirk Neumann Andreas Peichl Nico Pestel Sebastian Siegloch 《Economic inquiry》2015,53(2):1061-1085
This paper assesses the effects of U.S. tax policy reforms on inequality over around three decades, from 1979 to 2007. It applies a new method for decomposing changes in government redistribution into (1) a direct policy effect resulting from policy changes and (2) the effects of changing market incomes. Over the period as a whole, the tax policy changes increased income inequality by pushing up the income share of high‐income earners (the top 20%). (JEL H23, H31, H53, P16) 相似文献
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Objective. The literature on gender and technology use finds that women and men differ significantly in their attitudes toward their technological abilities. Concurrently, existing work on science and math abilities of students suggests that such perceived differences do not always translate into actual disparities. We examine the yet‐neglected area concerning gender differences with respect to Internet‐use ability. In particular, we test how self‐perceived abilities are related to actual abilities and how these may differ by gender. Methods. We use new data on web‐use skill to test empirically whether there are differences in men's and women's abilities to navigate online content. We draw on a diverse sample of adult Internet users to investigate the questions raised. Results. Findings suggest that men and women do not differ greatly in their online abilities. However, we find that women's self‐assessed skill is significantly lower than that of men. Conclusions. Women's lower self‐assessment regarding their web‐use skills may affect significantly the extent of their online behavior and the types of uses to which they put the medium. We discuss the implications of these findings for social inequality. 相似文献
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Charles J. Neumann 《The American statistician》2013,67(4):347-357
Tropical cyclones (tropical storms, hurricanes, typhoons, etc.) occur over many of the earth's tropical marine areas. Responsibility for tracking and predicting the future course of these storms is assigned to one or more domestic or foreign meteorological services. These services routinely activate a number of statistical and dynamical prediction models as objective guidance preparatory to issuing official forecasts on these storms. In this article, the role of the statistical models in this process is examined. 相似文献
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One of the key elements of understanding mechanisms of social stratification in job market entry is looking at the ways in which groups learn about careers and seek jobs in early adulthood. Online resources for job seeking are growing, yet we know very little about the nature of young adults' use of the Internet for this purpose. Are there types of people who utilize the Internet more than others? If so, are these patterns unique to the Internet or are they the same as those for other sources of information? We address these questions using survey data of 1,060 college first-years at one of the most ethnically diverse universities in the United States. The survey includes extensive measures of demographics, academic achievement, Internet experiences, as well as job-seeking practices. We find that African Americans, Asians, and Caucasians who grew up speaking a language other than English are more likely than Caucasian native English speakers to use the Internet for investigating jobs and careers. We also look at other sources of information, but only with the Internet do we find significant effects for these groups. 相似文献