Increasingly natural disasters and man-made malicious attacks threaten the power systems.Improving the resilience has become an inevitable requirement for the development of power systems.The importance assessment of ...Increasingly natural disasters and man-made malicious attacks threaten the power systems.Improving the resilience has become an inevitable requirement for the development of power systems.The importance assessment of components is of significance for resilience improvement,since it plays a crucial role in strengthening grid structure,designing restoration strategy,and improving resource allocation efficiency for disaster prevention and mitigation.This paper proposes a component importance assessment approach of power systems for improving resilience under wind storms.Firstly,the component failure rate model under wind storms is established.According to the model,system states under wind storms can be sampled by the non-sequential Monte Carlo simulation method.For each system state,an optimal restoration model is then figured out by solving a component repair sequence optimization model considering crew dispatching.The distribution functions of component repair moment can be obtained after a sufficient system state sampling.And Copeland ranking method is adopted to rank the component importance.Finally,the feasibility of the proposed approach is validated by extensive case studies.展开更多
From a FDI source country perspective, this paper reveals the effect of Chinas OFDI on host countries' environmental quality. Based on the Copeland-Taylor model, this paper creates a theoretical mechanism to demon...From a FDI source country perspective, this paper reveals the effect of Chinas OFDI on host countries' environmental quality. Based on the Copeland-Taylor model, this paper creates a theoretical mechanism to demonstrate how Chinas OFDI affects host countries' pollution intensity and environmental quality and carries out an empirical analysis based on Chinas OFDI data of 2003-2014 and the economic development index data of 168 host countries. Since Chinas OFDI is differentiated for countries of various income levels, this paper f Urther conducts a sub-sample empirical test on the income level of host countries. The result shows that Chinas OFDI growth generally induces an increase in total pollution emissions in host countries but significantly reduces per capita emissions and thus improves local environmental quality. Sub-sample regression result shows that whether in terms of total or per capita emissions, Chinas OFDI has a much more significant effect in improving the environmental quality of high-income countries.展开更多
本文阐述了一种新的制热技术——谷轮超低温数码涡旋热泵技术(Copeland Digital Scroll Heating),该技术以数码涡旋技术为基础。在低温环境下(<0℃)提供热量以达到舒适一直都是一种挑战。可选的制热技术——锅炉制热、电阻加热、加...本文阐述了一种新的制热技术——谷轮超低温数码涡旋热泵技术(Copeland Digital Scroll Heating),该技术以数码涡旋技术为基础。在低温环境下(<0℃)提供热量以达到舒适一直都是一种挑战。可选的制热技术——锅炉制热、电阻加热、加大压缩机、利用变频器超速运转等方法如今都在应用,但是没有一种方法达到高效率。超低温数码涡旋热泵技术使得热泵能在低温环境下可靠地运行,并能以最节能方法提供额外的热量。本文说明了超低温数码涡旋热泵技术的工作原理、在空调系统中的性能以及应用的灵活性。本文也探讨了一些需要考虑的技术问题来设计和优化这项技术在空调系统中的应用。展开更多
基金supported by Science and Technology Project of State Grid Corporation of China(No.5202011600UG).
文摘Increasingly natural disasters and man-made malicious attacks threaten the power systems.Improving the resilience has become an inevitable requirement for the development of power systems.The importance assessment of components is of significance for resilience improvement,since it plays a crucial role in strengthening grid structure,designing restoration strategy,and improving resource allocation efficiency for disaster prevention and mitigation.This paper proposes a component importance assessment approach of power systems for improving resilience under wind storms.Firstly,the component failure rate model under wind storms is established.According to the model,system states under wind storms can be sampled by the non-sequential Monte Carlo simulation method.For each system state,an optimal restoration model is then figured out by solving a component repair sequence optimization model considering crew dispatching.The distribution functions of component repair moment can be obtained after a sufficient system state sampling.And Copeland ranking method is adopted to rank the component importance.Finally,the feasibility of the proposed approach is validated by extensive case studies.
基金the sponsorship of SHUPE Postgraduate Innovation Fund Projects(CXJJ-2015-341CXJJ-2015-328)
文摘From a FDI source country perspective, this paper reveals the effect of Chinas OFDI on host countries' environmental quality. Based on the Copeland-Taylor model, this paper creates a theoretical mechanism to demonstrate how Chinas OFDI affects host countries' pollution intensity and environmental quality and carries out an empirical analysis based on Chinas OFDI data of 2003-2014 and the economic development index data of 168 host countries. Since Chinas OFDI is differentiated for countries of various income levels, this paper f Urther conducts a sub-sample empirical test on the income level of host countries. The result shows that Chinas OFDI growth generally induces an increase in total pollution emissions in host countries but significantly reduces per capita emissions and thus improves local environmental quality. Sub-sample regression result shows that whether in terms of total or per capita emissions, Chinas OFDI has a much more significant effect in improving the environmental quality of high-income countries.
文摘本文阐述了一种新的制热技术——谷轮超低温数码涡旋热泵技术(Copeland Digital Scroll Heating),该技术以数码涡旋技术为基础。在低温环境下(<0℃)提供热量以达到舒适一直都是一种挑战。可选的制热技术——锅炉制热、电阻加热、加大压缩机、利用变频器超速运转等方法如今都在应用,但是没有一种方法达到高效率。超低温数码涡旋热泵技术使得热泵能在低温环境下可靠地运行,并能以最节能方法提供额外的热量。本文说明了超低温数码涡旋热泵技术的工作原理、在空调系统中的性能以及应用的灵活性。本文也探讨了一些需要考虑的技术问题来设计和优化这项技术在空调系统中的应用。
