Based on the monitoring data of precipitation and runoff series from 1953 to 2013 and groundwater exploitation from 1977 to 2013 in Jinghui Irrigation Area,especially the evolution of water resources during the growth...Based on the monitoring data of precipitation and runoff series from 1953 to 2013 and groundwater exploitation from 1977 to 2013 in Jinghui Irrigation Area,especially the evolution of water resources during the growth period of main crops,the trend test of precipitation and runoff series was carried out by using Spearman rank correlation test and R/S analysis.The results showed that the annual mean precipitation and runoff and the growth period of main crops showed a downward trend,and the changes in the future were similar to those in the past;the amount of groundwater exploitation has not changed much,which is about 150 million m^3.The research results can provide scientific basis for efficient utilization and reasonable allocation of water resources in irrigation area,and provide technical support for the development of modern agriculture.展开更多
Let K = k(√θ) be a real cyclic quartic field, k be its quadratic subfield and K = k(√θ) be the corresponding imaginary quartic field. Denote the class numbers of K, k and K by hK, hk and hK respectively. Here cong...Let K = k(√θ) be a real cyclic quartic field, k be its quadratic subfield and K = k(√θ) be the corresponding imaginary quartic field. Denote the class numbers of K, k and K by hK, hk and hK respectively. Here congruences modulo powers of 2 for h = hK /hk and h = hK /hk are obtained via studying the p-adic L-functions of the fields.展开更多
TiO2 nanotube（TiNT） arrays were deposited on boron-doped diamond films by a liquid-phase deposition method with ZnO nanorod arrays as the template.The different morphologies of TiNTs have been obtained by controllin...TiO2 nanotube（TiNT） arrays were deposited on boron-doped diamond films by a liquid-phase deposition method with ZnO nanorod arrays as the template.The different morphologies of TiNTs have been obtained by controlling the morphology of ZnO template.The X-ray diffraction and energy-dispersive X-ray analysis show that the ZnO nanorod array template has been removed in the TiNTs formation process.The crystalline quality of the TiNTs is improved by increasing the annealing temperature.The band gap of the TiNTs is about 3.25 eV estimated by the UV-Vis absorption spectroscopy,which is close to the value of bulk TiO2.In the photoluminescence spectrum,a broad visible emission in a range of ca.550-750 nm appears due to the surface oxygen vacancies and defects.展开更多
文摘Based on the monitoring data of precipitation and runoff series from 1953 to 2013 and groundwater exploitation from 1977 to 2013 in Jinghui Irrigation Area,especially the evolution of water resources during the growth period of main crops,the trend test of precipitation and runoff series was carried out by using Spearman rank correlation test and R/S analysis.The results showed that the annual mean precipitation and runoff and the growth period of main crops showed a downward trend,and the changes in the future were similar to those in the past;the amount of groundwater exploitation has not changed much,which is about 150 million m^3.The research results can provide scientific basis for efficient utilization and reasonable allocation of water resources in irrigation area,and provide technical support for the development of modern agriculture.
基金supported by National Natural Science Foundation of China (Grant No. 10771111)
文摘Let K = k(√θ) be a real cyclic quartic field, k be its quadratic subfield and K = k(√θ) be the corresponding imaginary quartic field. Denote the class numbers of K, k and K by hK, hk and hK respectively. Here congruences modulo powers of 2 for h = hK /hk and h = hK /hk are obtained via studying the p-adic L-functions of the fields.
基金Supported by the National Natural Science Foundation of China（Nos.51072066, 11247305）, the PhD Programs Foundation of Ministry of Education of China（No.20100061110083）, the Open Project of State Key Laboratory of Superhard Materials（Jilin University）, China（No.201213） and the Youth Fund of Science and Technology Department of Jiangxi Province, China （No.20131522040044）.
文摘TiO2 nanotube（TiNT） arrays were deposited on boron-doped diamond films by a liquid-phase deposition method with ZnO nanorod arrays as the template.The different morphologies of TiNTs have been obtained by controlling the morphology of ZnO template.The X-ray diffraction and energy-dispersive X-ray analysis show that the ZnO nanorod array template has been removed in the TiNTs formation process.The crystalline quality of the TiNTs is improved by increasing the annealing temperature.The band gap of the TiNTs is about 3.25 eV estimated by the UV-Vis absorption spectroscopy,which is close to the value of bulk TiO2.In the photoluminescence spectrum,a broad visible emission in a range of ca.550-750 nm appears due to the surface oxygen vacancies and defects.
