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排序方式: 共有92条查询结果,搜索用时 15 毫秒
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Alexander Kunith Roman Mendelevitch Dietmar Goehlich 《International Journal of Sustainable Transportation》2017,11(10):707-720
The deployment of battery-powered electric bus systems within the public transportation sector plays an important role in increasing energy efficiency and abating emissions. Rising attention is given to bus systems using fast charging technology. This concept requires a comprehensive infrastructure to equip bus routes with charging stations. The combination of charging infrastructure and bus batteries needs a reliable energy supply to maintain a stable bus operation even under demanding conditions. An efficient layout of the charging infrastructure and an appropriate dimensioning of battery capacity are crucial to minimize the total cost of ownership and to enable an energetically feasible bus operation. In this work, the central issue of jointly optimizing the charging infrastructure and battery capacity is described by a capacitated set covering problem. A mixed-integer linear optimization model is developed to determine the minimum number and location of required charging stations for a bus network as well as the adequate battery capacity for each bus line. The bus energy consumption for each route segment is determined based on individual route, bus type, traffic, and other information. Different scenarios are examined in order to assess the influence of charging power, climate, and changing operating conditions. The findings reveal significant differences in terms of required infrastructure. Moreover, the results highlight a trade-off between battery capacity and charging infrastructure under different operational and infrastructure conditions. This paper addresses upcoming challenges for transport authorities during the electrification process of the bus fleets and sharpens the focus on infrastructural issues related to the fast charging concept. 相似文献
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What you are is what you like—similarity biases in venture capitalists' evaluations of start-up teams 总被引:2,自引:2,他引:0
Nikolaus Franke Marc Gruber Dietmar Harhoff Joachim Henkel 《Journal of Business Venturing》2006,21(6):802-826
This paper extends recent research studying biases in venture capitalist's decision making. We contribute to this literature by analyzing biases arising from similarities between a venture capitalist and members of a venture team. We summarize the psychological foundations of such similarity effects and derive a set of hypotheses regarding the impact of similarity on the assessment of team quality. Using data from a conjoint experiment with 51 respondents, we find that venture capitalists tend to favor teams that are similar to themselves in type of training and professional experience. Our results have important implications for academics and practitioners alike. 相似文献
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"According to traditional trade theory (Heckscher-Ohlin), free trade and free migration are equivalent measures of economic integration leading both to an equalization of factor prices. This prediction is in sharp opposition to the observed preference of rich countries for free trade over free migration. We provide an explanation for this inconsistency: the redistribution policies in the countries. Social welfare in countries with a relatively small number of low-skilled native workers is higher with free trade than with free migration due to redistribution of income towards immigrating workers." 相似文献
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Dietmar Keller 《Wirtschaftsdienst》2006,86(10):620-620
Ohne Zusammenfassung 相似文献
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Entrepreneurial Marketing (EM) will dem schwindenden Einfluss klassischer Medien entgegentreten. Bei den Konsumenten soll
ein glaubwürdiges, anschlussf?higes Produktimage ankommen. So baut EM auf unkonventionelle Ma?nahmen zur Erzeugung von Aufmerksamkeit
(Buzz Marketing), die exponentielle Diffusion von Kommunikationsinhalten (Viral Marketing), die Nutzung von Communities (Community
Marketing) oder die (Aus-)Nutzung der Marketingma?nahmen der Konkurrenz (Ambush Marketing), und versucht, mit geringem Mitteleinsatz
hohe Wirkungen zu erzielen (Guerilla Marketing). 相似文献
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One of the central issues in the Solvency II process will be an appropriate calculation of the Solvency Capital Requirement (SCR). This is the economic capital that an insurance company must hold in order to guarantee a one-year ruin probability of at most 0.5%. In the so-called standard formula, the overall SCR is calculated from individual SCRs in a particular way that imitates the calculation of the standard deviation for a sum of normally distributed risks (SCR aggregation formula). However, in order to cope with skewness in the individual risk distributions, this formula must be calibrated accordingly in order to maintain the prescribed level of confidence. In this paper, we want to show that the methods proposed and discussed thus far still show stability problems within the general setup. 相似文献
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This paper discusses the family of life distributions with failure rate functions which decrease initially until a change point and remain constant thereafter. The paper focuses on the estimation for the change point of the failure rate function. While point estimation of the change point of the failure rate function has been discussed by some authors, one can hardly find any existing work on the interval estimation of the change point. In this paper, a method for constructing approximate confidence intervals for the change point is proposed. The proposed approximate confidence intervals are based on the number of failed test items at or before a fixed inspection time. Received: September 1999 相似文献