In recent years,with the rapid development and expansion of postgraduate education in China,the cultivation quality has become increasingly prominent.In graduate education activities,there are many factors that affect...In recent years,with the rapid development and expansion of postgraduate education in China,the cultivation quality has become increasingly prominent.In graduate education activities,there are many factors that affect the quality of cultivation,among which the tutor’s guiding ability is undoubtedly the key factor that affects the quality of graduate students’cultivation.In the 2020 National Graduate Education Conference,one of its topics is how to objectively quantify the guiding ability of supervisors based on which the teaching resources can be optimally allocated.Taking Hangzhou Dianzi University as an example,this paper investigates the index systems to evaluate the guiding ability of graduate students’supervisors including 6 first-level indicators and 19 second-level indicators in order to further improve the cultivation performance of graduate students.展开更多
In order to realize reliable and fast simulation of FWM power evaluation, USSD (Uniform Step-Size Distribution) method is modified and its corresponding simulation results of FWM efficiency and computational time are ...In order to realize reliable and fast simulation of FWM power evaluation, USSD (Uniform Step-Size Distribution) method is modified and its corresponding simulation results of FWM efficiency and computational time are presented.展开更多
The development of fuel cell vehicles(FCVs)has a major impact on improving air quality and reducing other fossil-fuel-related problems.DC-DC boost converters with wide input voltage ranges and high gains are essential...The development of fuel cell vehicles(FCVs)has a major impact on improving air quality and reducing other fossil-fuel-related problems.DC-DC boost converters with wide input voltage ranges and high gains are essential to fuel cells and DC buses in the powertrains of FCVs,helping to improve the low voltage of fuel cells and“soft”output characteristics.To build DC-DC converters with the desired performance,their topologies have been widely investigated and optimized.Aiming to obtain the optimal design of wide input range and high-gain DC-DC boost converter topologies for FCVs,a review of the research status of DC-DC boost converters based on an impedance network is presented.Additionally,an evaluation system for DC-DC topologies for FCVs is constructed,providing a reference for designing wide input range and high-gain boost converters.The evaluation system uses eight indexes to comprehensively evaluate the performance of DC-DC boost converters for FCVs.On this basis,issues about DC-DC converters for FCVs are discussed,and future research directions are proposed.The main future research directions of DC-DC converter for FCVs include utilizing a DC-DC converter to realize online monitoring of the water content in FCs and designing buck-boost DC-DC converters suitable for high-power commercial FCVs.展开更多
基金Zhejiang Association of Postgraduate Education(No.2021-003)National Social Science Foundation of China(No.19ZDA348)Association of Fundamental Computing Education in Chinese Universities(No.2021-AFCEC-195)。
文摘In recent years,with the rapid development and expansion of postgraduate education in China,the cultivation quality has become increasingly prominent.In graduate education activities,there are many factors that affect the quality of cultivation,among which the tutor’s guiding ability is undoubtedly the key factor that affects the quality of graduate students’cultivation.In the 2020 National Graduate Education Conference,one of its topics is how to objectively quantify the guiding ability of supervisors based on which the teaching resources can be optimally allocated.Taking Hangzhou Dianzi University as an example,this paper investigates the index systems to evaluate the guiding ability of graduate students’supervisors including 6 first-level indicators and 19 second-level indicators in order to further improve the cultivation performance of graduate students.
文摘In order to realize reliable and fast simulation of FWM power evaluation, USSD (Uniform Step-Size Distribution) method is modified and its corresponding simulation results of FWM efficiency and computational time are presented.
基金This work was sponsored thought the International Science&Technology Cooperation of China under 2019YFE0100200 and the Fundamental Research Foundation for Universities of Heilongjiang Province(2018-KYYWF-1672).
文摘The development of fuel cell vehicles(FCVs)has a major impact on improving air quality and reducing other fossil-fuel-related problems.DC-DC boost converters with wide input voltage ranges and high gains are essential to fuel cells and DC buses in the powertrains of FCVs,helping to improve the low voltage of fuel cells and“soft”output characteristics.To build DC-DC converters with the desired performance,their topologies have been widely investigated and optimized.Aiming to obtain the optimal design of wide input range and high-gain DC-DC boost converter topologies for FCVs,a review of the research status of DC-DC boost converters based on an impedance network is presented.Additionally,an evaluation system for DC-DC topologies for FCVs is constructed,providing a reference for designing wide input range and high-gain boost converters.The evaluation system uses eight indexes to comprehensively evaluate the performance of DC-DC boost converters for FCVs.On this basis,issues about DC-DC converters for FCVs are discussed,and future research directions are proposed.The main future research directions of DC-DC converter for FCVs include utilizing a DC-DC converter to realize online monitoring of the water content in FCs and designing buck-boost DC-DC converters suitable for high-power commercial FCVs.
