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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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Cecilie Sudland 《Child & Family Social Work》2020,25(2):248-255
Social workers within child protection services report that families marked by high levels of conflict between separated parents are among the most challenging cases to handle. Few studies however have focussed on how social workers themselves experience and meet with parents involved in hostile martial interactions. This article reports on a qualitative study involving 31 social workers and provides an analysis of their experiences and dilemmas in working with such families. Findings demonstrate that social workers struggle to find ways to help high‐conflict families and often find themselves at an impasse. Parents involved in such conflict are highly resistant to change, and social workers struggle to engage with them over concerns about their children. Furthermore, findings suggest that social workers lack organizationally allotted time to assist the parents. I conclude by discussing ways in which emotional support, empowering interventions, and strength‐based approaches enable social workers to manage relationships with high‐conflict families. More research on this topic is needed to support and promote better practices for social workers to be more effective in assisting high‐conflict families. 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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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