6篇
您的检索式：作者名="J.Christopher"
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| 1 | Plasma-catalysis: Is it just a question of scale?显示文摘The issues of describing and understanding the changes in performance that result when a catalyst is placed into plasma are discussed. The different chemical and physical interactions that result and how their combination might produce beneficial results for the plasma-catalytic processing of different gas streams are outlined with particular emphasis being placed on the different range of spatial and temporal scales that must be considered both in experiment and modelling. The focus is on non-thermal plasma where the lack of thermal equilibrium creates a range of temperature scales that must be considered. This contributes in part to a wide range of inhomogeneity in different properties such as species concentrations and electric fields that must be determined experimentally by in situ methods and be incorporated into modelling. It is concluded that plasmacatalysis is best regarded as conventional catalysis perturbed by the presence of a discharge, which modifies its operating conditions, properties and outcomes often in a very localised way. The sometimes used description 'plasma-activated catalysis' is an apt one. | J.Christopher Whitehead | 2019 | Frontiers of Chemical Science and Engineering2019，13，2： | 2 |
| 2 | Knowledge exchange and combination:the role of human resource practices in the performance of high-technology firms显示文摘 | Collins J.Christopher Ken G.Smith | | 0，，03： | 1 |
| 3 | Economics of eBay’s buyer protection plan显示文摘Background:This paper explores the financial viability of eBay’s Buyer Protection Plan.Methods:We explore their warranty model assuming exponential auction listing and claims times,under competing assumptions of Normal(classical portfolio theory)versus Paretian claims(industry practice)distributions using a normative algorithm.EBay’s model viability was analyzed under three risk metrics–mean-variance risk of classic portfolio theory;value at risk used in regulation such as the Basel Accords;and tail value at risk which is preferred by academics.Results:Five main findings of the research are:(1)long-term financial viability is set by boundary conditions that can be managed in eBay’s contract terms,(2)commonly used but simplistic assumptions of Gaussian distributions of contract failures can be misleading,and keeping the Buyer Protection Plan viable demands more realistic distributions,(3)value at risk measures provide more information about viability than expectations,(4)tail value at risk measures an lead to sudden and extreme variations in fund value over the parameter range and flawed contracting decisions,and(5)tail value at risk is the preferable risk measure for assessing Buyer Protection Plan viability,but it needs to be used with an assumption of Lomax contract failures to support profitable contracting.Conclusions:Our analysis showed substantial improvements in claims management when tail value at risk measures were used instead of conventional VaR measures.This implies that current strategies,and prices for coverage may result in losses to eBay,in current practice. | J.Christopher Westland | 2015 | Financial Innovation2015，1，1： | 0 |
| 4 | 性传播疾病的预防和治疗的最新进展显示文摘 | KARI.E.MILLER M.D. J.CHRISTOPHER GRAVES M.D. 张岱 | 2001 | 实用乡村医生杂志2001，8，6： | 0 |
| 5 | 坦桑尼亚马菲亚岛海洋保护区的发展显示文摘迄今,坦桑尼亚的海岸带管理没有取得多大成功,生境的损失和退化依然没有得到控制。本文论述了以前管理策略上的问题,并提出了保护马菲亚岛南部地区的新管理策略。所选择的策略是为了克服过去管理上的缺点,并根据多种使用者的概念而制定的。为了随后能制定出管理计划,进行了三年的研究工作。本文描述和讨论了这一研究计划的设计、最终调查结果及其在制定该管理计划中的运用。最后,木文还介绍了在所建议的地区进行研究和监测的未来计划。 | J.Christopher Horrill William R.T.Darwall Magnus Ngoile 刘美敏 王欣 | 1996 | 人类环境杂志1996，25，1： | 0 |
| 6 | 聚合酶链反应对临床医学的影响显示文摘 | 赵博 J.Christopher Post | 2001 | 美国医学会杂志(中文版)2001，20，2： | 0 |
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