Based on blasting demolition of high thin-wall hyperbolic reinforced concrete cool tower, by virtue of engineering practice of blasting the tube concrete structures, the analysis and research were made on the mechanis...Based on blasting demolition of high thin-wall hyperbolic reinforced concrete cool tower, by virtue of engineering practice of blasting the tube concrete structures, the analysis and research were made on the mechanism of cool tower collapse through selecting blasting parameters and selecting gap form, gap size and gap angle. The cool tower was twisted, collapsed directionally and broken well according to the design requirements. The expected results and purposes of blasting were obtained with no back blow, total blasted pile approximates to 4 - 5 m, no occurrence of flying stones and no damage to fixed buildings and equipment, the large-sized hyperbolic thin-wall reinforced concrete cool towers are twisted during blasting and it collapses well with good breaking. The test and measurement of blasting vibrating velocity was carried out during blasting and the measuring results are much less than critical values specified by Safety Regulations for Blasting. The study shows that gap form, gap size and gap angle are the key factors to cool tower collapse and will give beneficial references to related theoretical study and field application.展开更多
Vortices in the N-gap （N ≥ 1） superconductor is studied by Dirac δ function. The topological structure of vortices can be characterized by Brouwer degree and Hopf index, i.e. （βtη1,… , βNηN ）. The magnetic ...Vortices in the N-gap （N ≥ 1） superconductor is studied by Dirac δ function. The topological structure of vortices can be characterized by Brouwer degree and Hopf index, i.e. （βtη1,… , βNηN ）. The magnetic flux and circulation of vortices without London approximation in the N-gap superconductor are calculated. The universal modified London equation is given for the case that each individual condensate is conserved or not conserved.展开更多
China＇s population aging trend is gradually exacerbated, the family size was miniaturized development, the number of rural elderly is large, and the rural economy is poor, a large number of young people working abroa...China＇s population aging trend is gradually exacerbated, the family size was miniaturized development, the number of rural elderly is large, and the rural economy is poor, a large number of young people working abroad, empty nest large number of elderly, and rural old-age concept is more backward, most of the elderly Would like to choose the body pension, resulting in pension problems. This paper analyzes the problem of rural pension by analyzing the structure model oflSM, and concludes that the rural pension is mainly backward from the concept of old-age pension, the urban-rural economic gap is large, the old legal system of old-age security is imperfect and the miniaturization of the family is the fundamental problem. And to improve the old-age security laws, improve the security system; to strengthen the mutual assistance to reduce the family miniaturization of the small and medium-sized rural areas to strengthen the rural economy, to reduce the urban and rural economic gap; to guide the rural elderly to change the concept of old age, to encourage them to accept other pension methods; Endowed with unfavorable advice. To meet the rural population aging requirements, and gradually narrow the gap between urban and rural areas, to speed up the integration of urban and rural development process, promote social equity and social stability.展开更多
文摘Based on blasting demolition of high thin-wall hyperbolic reinforced concrete cool tower, by virtue of engineering practice of blasting the tube concrete structures, the analysis and research were made on the mechanism of cool tower collapse through selecting blasting parameters and selecting gap form, gap size and gap angle. The cool tower was twisted, collapsed directionally and broken well according to the design requirements. The expected results and purposes of blasting were obtained with no back blow, total blasted pile approximates to 4 - 5 m, no occurrence of flying stones and no damage to fixed buildings and equipment, the large-sized hyperbolic thin-wall reinforced concrete cool towers are twisted during blasting and it collapses well with good breaking. The test and measurement of blasting vibrating velocity was carried out during blasting and the measuring results are much less than critical values specified by Safety Regulations for Blasting. The study shows that gap form, gap size and gap angle are the key factors to cool tower collapse and will give beneficial references to related theoretical study and field application.
基金Supported by the National Natural Science Foundation of China under Grant No.10805022
文摘Vortices in the N-gap （N ≥ 1） superconductor is studied by Dirac δ function. The topological structure of vortices can be characterized by Brouwer degree and Hopf index, i.e. （βtη1,… , βNηN ）. The magnetic flux and circulation of vortices without London approximation in the N-gap superconductor are calculated. The universal modified London equation is given for the case that each individual condensate is conserved or not conserved.
文摘China＇s population aging trend is gradually exacerbated, the family size was miniaturized development, the number of rural elderly is large, and the rural economy is poor, a large number of young people working abroad, empty nest large number of elderly, and rural old-age concept is more backward, most of the elderly Would like to choose the body pension, resulting in pension problems. This paper analyzes the problem of rural pension by analyzing the structure model oflSM, and concludes that the rural pension is mainly backward from the concept of old-age pension, the urban-rural economic gap is large, the old legal system of old-age security is imperfect and the miniaturization of the family is the fundamental problem. And to improve the old-age security laws, improve the security system; to strengthen the mutual assistance to reduce the family miniaturization of the small and medium-sized rural areas to strengthen the rural economy, to reduce the urban and rural economic gap; to guide the rural elderly to change the concept of old age, to encourage them to accept other pension methods; Endowed with unfavorable advice. To meet the rural population aging requirements, and gradually narrow the gap between urban and rural areas, to speed up the integration of urban and rural development process, promote social equity and social stability.
