SITW, established in January 1960, is the first manufacturer specialized in instrument transformers in China. As one of the leading enterprises under the Ministry of Machinery Industry, SITW enjoys the reputation of t...SITW, established in January 1960, is the first manufacturer specialized in instrument transformers in China. As one of the leading enterprises under the Ministry of Machinery Industry, SITW enjoys the reputation of the only "National 2nd Grade Enterprise" in its specific industry. SITW, who first got the KEMA certificate for its products among its peers has successfully been granted the展开更多
After brief describing the Principle of wavelet transform (WT) of signals, a new signals analysis system based on wavelet transform is introduced. The design and development of the instryment of wavelet transform are ...After brief describing the Principle of wavelet transform (WT) of signals, a new signals analysis system based on wavelet transform is introduced. The design and development of the instryment of wavelet transform are described. A number of practical uses of this system demonstrate that wavelet transform system is specially functional in identifying and processing impulse, singular and non-smooth signals, so that it should be evaluated the most advanced signal analyzing system.展开更多
GeneralChina transformer manufacturing industry was set up inthe year 1927 which lagged 41 years behind the time when trans-former had been invented.In 1936,the transformer with per unitcapacity 300 kVA with the volta...GeneralChina transformer manufacturing industry was set up inthe year 1927 which lagged 41 years behind the time when trans-former had been invented.In 1936,the transformer with per unitcapacity 300 kVA with the voltage 13.2/6.6 kV was produced.Afterthe founding of the People’s Republic of China,not only per unitcapacity and voltage class of the transformers,but also the types,varieties,performance parameters and the annual output of thetranstormers had been developed rapidly.Voltage classes of themass-produced transformers and autotransformers with the differentcapacity ratings were 220 kV in 60’s,330 kV in 70’s and 500 kV展开更多
The Fourier transform spectrometer(FTS)is a core instrument for solar observation with high spectral resolution,especially in the infrared.The Infrared System for the Accurate Measurement of Solar Magnetic Field(AIMS)...The Fourier transform spectrometer(FTS)is a core instrument for solar observation with high spectral resolution,especially in the infrared.The Infrared System for the Accurate Measurement of Solar Magnetic Field(AIMS),working at 10-13μm,will use an FTS to observe the solar spectrum.The Bruker IFS-125 HR,which meets the spectral resolution requirement of AIMS but simply equips with a point source detector,is employed to carry out preliminary experiment for AIMS.A sun-light feeding experimental system is further developed.Several experiments are taken with them during 2018 and 2019 to observe the solar spectrum in the visible and near infrared wavelength,respectively.We also proposed an inversion method to retrieve the solar spectrum from the observed interferogram and compared it with the standard solar spectrum atlas.Although there is a wavelength limitation due to the present sun-light feeding system,the results in the wavelength band from 0.45-1.0μm and 1.0-2.2μm show a good consistency with the solar spectrum atlas,indicating the validity of our observing configuration,the data analysis method and the potential to work in longer wavelength.The work provided valuable experience for the AIMS not only for the operation of an FTS but also for the development of its scientific data processing software.展开更多
文摘SITW, established in January 1960, is the first manufacturer specialized in instrument transformers in China. As one of the leading enterprises under the Ministry of Machinery Industry, SITW enjoys the reputation of the only "National 2nd Grade Enterprise" in its specific industry. SITW, who first got the KEMA certificate for its products among its peers has successfully been granted the
基金This project is supported by National Natural Science Foundation of China
文摘After brief describing the Principle of wavelet transform (WT) of signals, a new signals analysis system based on wavelet transform is introduced. The design and development of the instryment of wavelet transform are described. A number of practical uses of this system demonstrate that wavelet transform system is specially functional in identifying and processing impulse, singular and non-smooth signals, so that it should be evaluated the most advanced signal analyzing system.
文摘GeneralChina transformer manufacturing industry was set up inthe year 1927 which lagged 41 years behind the time when trans-former had been invented.In 1936,the transformer with per unitcapacity 300 kVA with the voltage 13.2/6.6 kV was produced.Afterthe founding of the People’s Republic of China,not only per unitcapacity and voltage class of the transformers,but also the types,varieties,performance parameters and the annual output of thetranstormers had been developed rapidly.Voltage classes of themass-produced transformers and autotransformers with the differentcapacity ratings were 220 kV in 60’s,330 kV in 70’s and 500 kV
基金supported by the National Natural Science Foundation of China(Grant Nos.11873062,11427901,11673038,11803002,11973056,11973061,12003051 and 12073040)supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant Nos.XDA15320102 and XDA15052200)。
文摘The Fourier transform spectrometer(FTS)is a core instrument for solar observation with high spectral resolution,especially in the infrared.The Infrared System for the Accurate Measurement of Solar Magnetic Field(AIMS),working at 10-13μm,will use an FTS to observe the solar spectrum.The Bruker IFS-125 HR,which meets the spectral resolution requirement of AIMS but simply equips with a point source detector,is employed to carry out preliminary experiment for AIMS.A sun-light feeding experimental system is further developed.Several experiments are taken with them during 2018 and 2019 to observe the solar spectrum in the visible and near infrared wavelength,respectively.We also proposed an inversion method to retrieve the solar spectrum from the observed interferogram and compared it with the standard solar spectrum atlas.Although there is a wavelength limitation due to the present sun-light feeding system,the results in the wavelength band from 0.45-1.0μm and 1.0-2.2μm show a good consistency with the solar spectrum atlas,indicating the validity of our observing configuration,the data analysis method and the potential to work in longer wavelength.The work provided valuable experience for the AIMS not only for the operation of an FTS but also for the development of its scientific data processing software.
