In this paper, it is offered to use the method of modulated reflection for the measurementof complex transfer factor of a radome wall on various sites of its surface. The circuit of equipmentallowed to carry out of su...In this paper, it is offered to use the method of modulated reflection for the measurementof complex transfer factor of a radome wall on various sites of its surface. The circuit of equipmentallowed to carry out of such measurement is given. The advantage of the given method in comparisonwith measurements on a gleam is shown. The results of the experimental research are given and theestimation of the accuracy of proposed method is considered.展开更多
In recent years, researches on rural human capital are of great concern, but for how to effectively use the rural human capital is scanty, and thus, the transfer of rural human capital becomes a kind of way to solve r...In recent years, researches on rural human capital are of great concern, but for how to effectively use the rural human capital is scanty, and thus, the transfer of rural human capital becomes a kind of way to solve rural human capital utilization. A portion of China rural human capital has been successful transferred, however, because of the restrain of their conditions, they can only be engaged in some low level work. In China rural areas, there are a lot of rural human capitals who are not successful transferred. How to successfully transfer the rest of this part rural human capital and how to make them play roles will be an important task. In this paper, according to the practical situations, we first defined the rural human capital, and then briefly summarized the importance of human capital transfer. At last, we found out the restriction factors of rural human capital transfer in China, and put forward some suggestions and measures to solve the problems.展开更多
Mathematical modelling for power DC/DC converters is a historical problem accompanying DC/DC conversion technology since 1940’s. The traditional mathematical modelling is not available for complex structure converter...Mathematical modelling for power DC/DC converters is a historical problem accompanying DC/DC conversion technology since 1940’s. The traditional mathematical modelling is not available for complex structure converters since the differential equation order increases very high. We have to search other way to establish mathematical modelling for power DC/DC converters.We have theoretically defined a new concept-Energy Factor （EF） in this paper and researched the relations between EF and the mathematical modelling for power DC/DC converters. EF is a new concept in power DC/DC conversion technology, which thoroughly differs from the traditional concepts such as power factor （PF）, power transfer efficiency （η）, total harmonic distortion （THD） and ripple factor （RF）. EF and the subsequential EFV (and EFVD) can illustrate the system stability, reference response and interference recovery. This investigation is very helpful for system design and DC/DC converters characteristics foreseeing. Two DC/DC converters: Buck converter and Super-Lift Luo-Converter as the samples are analysed in this paper to demonstrate the applications of EF, EFV (and EFVD), PE, SE, VE （and VED）, time constant τ and damping time constant τd.展开更多
文摘In this paper, it is offered to use the method of modulated reflection for the measurementof complex transfer factor of a radome wall on various sites of its surface. The circuit of equipmentallowed to carry out of such measurement is given. The advantage of the given method in comparisonwith measurements on a gleam is shown. The results of the experimental research are given and theestimation of the accuracy of proposed method is considered.
基金Supported by Model of New Generation Migrant Laborers' Quality Construction in Heilongjiang Province Based on Sociology Net(GZ11D202)Post-crisis Migrant Workers Returning Home for Entrepreneurial(10C011)+1 种基金Urbanization of Heilongjiang Province and Ecological Interactive Mode(12B033)Evaluation for Urban and Rural Employment and Manpower in Heilongjiang Province(11552020)
文摘In recent years, researches on rural human capital are of great concern, but for how to effectively use the rural human capital is scanty, and thus, the transfer of rural human capital becomes a kind of way to solve rural human capital utilization. A portion of China rural human capital has been successful transferred, however, because of the restrain of their conditions, they can only be engaged in some low level work. In China rural areas, there are a lot of rural human capitals who are not successful transferred. How to successfully transfer the rest of this part rural human capital and how to make them play roles will be an important task. In this paper, according to the practical situations, we first defined the rural human capital, and then briefly summarized the importance of human capital transfer. At last, we found out the restriction factors of rural human capital transfer in China, and put forward some suggestions and measures to solve the problems.
文摘Mathematical modelling for power DC/DC converters is a historical problem accompanying DC/DC conversion technology since 1940’s. The traditional mathematical modelling is not available for complex structure converters since the differential equation order increases very high. We have to search other way to establish mathematical modelling for power DC/DC converters.We have theoretically defined a new concept-Energy Factor （EF） in this paper and researched the relations between EF and the mathematical modelling for power DC/DC converters. EF is a new concept in power DC/DC conversion technology, which thoroughly differs from the traditional concepts such as power factor （PF）, power transfer efficiency （η）, total harmonic distortion （THD） and ripple factor （RF）. EF and the subsequential EFV (and EFVD) can illustrate the system stability, reference response and interference recovery. This investigation is very helpful for system design and DC/DC converters characteristics foreseeing. Two DC/DC converters: Buck converter and Super-Lift Luo-Converter as the samples are analysed in this paper to demonstrate the applications of EF, EFV (and EFVD), PE, SE, VE （and VED）, time constant τ and damping time constant τd.
