The intelligent substation relay protection facility is a fundamental element in construction of modern power system,based on the principles of flexibility,security and accuracy,and it can be divided into process laye...The intelligent substation relay protection facility is a fundamental element in construction of modern power system,based on the principles of flexibility,security and accuracy,and it can be divided into process layer and substation layer according to specific equipment.The former is suitable for individual sampling of disposable equipment,can be separated from the base station synchronization sampling,with the help of synchronous digital system and ping-pong algorithm to achieve synchronization of the overall sampling,that is to take the distribution protection components,through the separate transmission medium to realize the information transmission;the latter is for variable power plant components centralized backup protection,taking online real-time tuning technique.展开更多
For electrical equipment, in the process of operation, there is a close relationship between operation quality and power consumption quality. Therefore, the installation process of electrical equipment is also an impo...For electrical equipment, in the process of operation, there is a close relationship between operation quality and power consumption quality. Therefore, the installation process of electrical equipment is also an important part of power engineering project construction. n order to further improve the usability of electrical equipment and avoid potential safety hazards, it is necessary to improve the practicability of electrical equipment, so as to improve the safety in the operation of power system. ext, the article discusses the problems and optimization methods existing in the installation and commissioning of electrical equipment.展开更多
Thermoelectric generators(TEGs)demonstrate great potential for flexible and wearable electronics due to the direct electrical energy harvested from waste heat.Good wearability requires high mechanical flexibility and ...Thermoelectric generators(TEGs)demonstrate great potential for flexible and wearable electronics due to the direct electrical energy harvested from waste heat.Good wearability requires high mechanical flexibility and preferable stretchability,while current TEGs are primarily developed with rigid or non-stretchable components,which do not conform well to human skin or accommodate human motions,thus hindering further applications.展开更多
The Seebeck effect measures the electric potential built up in materials under a temperature gradient.For organic thermoelectric materials,the Seebeck coefficient shows more complicated temperature dependence than con...The Seebeck effect measures the electric potential built up in materials under a temperature gradient.For organic thermoelectric materials,the Seebeck coefficient shows more complicated temperature dependence than conventional systems,with both monotonic increases and nonmonotonic behavior,that is,first increasing and then decreasing.The mechanism behind the phenomenon is intriguing.Through first-principles calculations coupled with the Boltzmann transport equation,we demonstrate typical trends of the Seebeck coefficient with respect to temperature through band structure analysis.展开更多
文摘The intelligent substation relay protection facility is a fundamental element in construction of modern power system,based on the principles of flexibility,security and accuracy,and it can be divided into process layer and substation layer according to specific equipment.The former is suitable for individual sampling of disposable equipment,can be separated from the base station synchronization sampling,with the help of synchronous digital system and ping-pong algorithm to achieve synchronization of the overall sampling,that is to take the distribution protection components,through the separate transmission medium to realize the information transmission;the latter is for variable power plant components centralized backup protection,taking online real-time tuning technique.
文摘For electrical equipment, in the process of operation, there is a close relationship between operation quality and power consumption quality. Therefore, the installation process of electrical equipment is also an important part of power engineering project construction. n order to further improve the usability of electrical equipment and avoid potential safety hazards, it is necessary to improve the practicability of electrical equipment, so as to improve the safety in the operation of power system. ext, the article discusses the problems and optimization methods existing in the installation and commissioning of electrical equipment.
基金Foundation for Distinguished Young Talents in Higher Education of Guangdong,China(project no.2020KQNCX061)a generous grant from Shenzhen Fundamental Research Program(project no.JCYJ20200109105604088).
文摘Thermoelectric generators(TEGs)demonstrate great potential for flexible and wearable electronics due to the direct electrical energy harvested from waste heat.Good wearability requires high mechanical flexibility and preferable stretchability,while current TEGs are primarily developed with rigid or non-stretchable components,which do not conform well to human skin or accommodate human motions,thus hindering further applications.
基金supported by the National Natural Science Foundation of China through the project“Science Center for Luminescence from Molecular Aggregates”(SCELMAgrant no.201788102)the Ministry of Science and Technology of China through the National Key R&D Plan(grant no.2017YFA0204501).
文摘The Seebeck effect measures the electric potential built up in materials under a temperature gradient.For organic thermoelectric materials,the Seebeck coefficient shows more complicated temperature dependence than conventional systems,with both monotonic increases and nonmonotonic behavior,that is,first increasing and then decreasing.The mechanism behind the phenomenon is intriguing.Through first-principles calculations coupled with the Boltzmann transport equation,we demonstrate typical trends of the Seebeck coefficient with respect to temperature through band structure analysis.
