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排序方式: 共有78条查询结果,搜索用时 15 毫秒
1.
The Productivity of US States since 1880 总被引:1,自引:0,他引:1
This study uses state-level variation in labor productivity levels at twenty-year intervals between 1880 and 1980 to examine the relative importance of institutional and geographical influences in explaining observed and persistent differences in standards of living over time and across regions. Focusing on fundamental rather than proximate influences, we find that both institutional characteristics and some physical geography characteristics account for a high proportion of the differences in state productivity levels: states with navigable waterways, a large minerals endowment, and no slaves in 1860, on average, had higher labor productivity levels throughout the sample period. However, we find little support for two other influences that have previously received attention—climate and latitude. 相似文献
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Kenneth L. Cashdollar Eric S. Weiss Nevin B. Greninger Kris Chatrathi 《Process Safety Progress》1992,11(4):247-255
This paper describes dust explosibility research in full-scale experimental mines and a 20-L laboratory chamber at the U.S. Bureau of Mines and in a 1-m3 laboratory chamber at Fike Corporation. The purpose of this research is to improve safety in mining and other industries that manufacture, process, or use combustible dusts. As part of this work, carbonaceous dusts with a wide range of volatilities and various particle size distributions were studied. Laboratory data on the minimum explosible concentrations of predispersed dusts were comparable to mine data for nominal dust loadings that were dispersed by the aerodynamic disturbance from a gas ignition zone. Recommendations are given on the limitations of small-scale testing such as “overdriving” by too strong of an ignitor. The effect of dust particle size on explosibility data is illustrated for coal and aluminum dusts. For both dusts, the finest sizes were the most hazardous. The inerting requirements for preventing explosions were also measured in both laboratory and large-scale systems. All the data show relatively good agreement between the laboratory and the large-scale tests. 相似文献
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The Impact of Land-Use Change on Ecosystem Services,Biodiversity and Returns to Landowners: A Case Study in the State of Minnesota 总被引:12,自引:1,他引:12
Stephen Polasky Erik Nelson Derric Pennington Kris A. Johnson 《Environmental and Resource Economics》2011,48(2):219-242
Land-use change has a significant impact on the world’s ecosystems. Changes in the extent and composition of forests, grasslands,
wetlands and other ecosystems have large impacts on the provision of ecosystem services, biodiversity conservation and returns
to landowners. While the change in private returns to landowners due to land-use change can often be measured, changes in
the supply and value of ecosystem services and the provision of biodiversity conservation have been harder to quantify. In
this paper we use a spatially explicit integrated modeling tool (InVEST) to quantify the changes in ecosystem services, habitat
for biodiversity, and returns to landowners from land-use change in Minnesota from 1992 to 2001. We evaluate the impact of
actual land-use change and a suite of alternative land-use change scenarios. We find a lack of concordance in the ranking
of baseline and alternative land-use scenarios in terms of generation of private returns to landowners and net social benefits
(private returns plus ecosystem service value). Returns to landowners are highest in a scenario with large-scale agricultural
expansion. This scenario, however, generated the lowest net social benefits across all scenarios considered because of large
losses in stored carbon and negative impacts on water quality. Further, this scenario resulted in the largest decline in habitat
quality for general terrestrial biodiversity and forest songbirds. Our results illustrate the importance of taking ecosystem
services into account in land-use and land-management decision-making and linking such decisions to incentives that accurately
reflect social returns. 相似文献
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Kris Jacobs 《The Journal of Finance》1999,54(1):123-163
This paper investigates Euler equations involving security prices and household-level consumption data. It provides a useful complement to many existing studies of consumption-based asset pricing models that use a representative-agent framework, because the Euler equations under investigation hold even if markets are incomplete. It also provides a useful complement to simulation-based studies of market incompleteness. The empirical evidence indicates that the theory is rejected by the data along several dimensions. The results therefore indicate that some well-documented asset-pricing puzzles do not result from aggregation problems for the preferences under investigation. 相似文献
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Adrian Sargeant Kris Pole 《International Journal of Nonprofit & Voluntary Sector Marketing》1998,3(2):122-135
In the United Kingdom, Charities Aid Foundation (CAF) data suggest that grant-making trusts are currently responsible for supplying over 13 per cent of an ‘average’ charity's income (approximately four times the amount committed by corporate donors). Remarkably however, very little is known about the behaviour of such organisations and the contact strategies that are used by charities to solicit their support. This paper reviews the findings of a postal survey of 350 grant-making trusts and identifies the criteria most commonly used to perform an initial sift of proposals and to develop a final short list to appraise for support or rejection. The findings clearly show that charity applications to trusts have increased dramatically over the past three years. Regrettably however, trusts perceive that there has been an accompanying decline in the standards of application being made. Trusts report that they are now frequently subjected to ill-considered ‘blanket’ mailings from charities that often take no account of the specific aims and objectives of the trust. In general, the research also identified that applicants appeared to have undertaken very little research prior to submission of their application and if successful, would be unlikely to thank the trustees, nor to indicate what had been achieved as a result of their generosity. 相似文献
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This article examines how community-based groups have dealt with the potential housing impacts of urban mega-events (also known as 'hallmark events') in the city. Three Canadian case studies are used- Expo '86 in Vancouver, the 1988 Calgary Winter Olympics, and the rejected proposal for the 1996 Summer Olympic Games in Toronto- to discuss a range of issues including the nature and impact of community action in forcing the organisers of mega-events to address the potential of event-related housing impacts. The research findings suggest that mega-eventrelated forced evictions should be viewed as an expected result of this form of urban restructuring as these events are used to bring new people, new facilities, and new money to cities ata rapid pace,and this goalis rarely evaluated in an open democratic manner. Further, the critical prerequisite for any effective community action to occur is the presence of an organised, strategic and resourceful coalition of community-based groups which have the capacity to analyse complex situations, act forcefully at a variety of levels, and use diverse strategies in order to take advantage of key 'openings' when seeking to achieve their goals. 相似文献
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