BOLIVIA Alpacas at the launch ceremony of the International Year of the Camelids in La Paz on 7 May.US A qualifying race of the 2024 Miami Grand Prix in Miami on 4 May.CANADA The Harrison Tulip Festival is held in Bri...BOLIVIA Alpacas at the launch ceremony of the International Year of the Camelids in La Paz on 7 May.US A qualifying race of the 2024 Miami Grand Prix in Miami on 4 May.CANADA The Harrison Tulip Festival is held in British Columbia on 2 May .GERMANY People walk past two parrot statues during the FIDENA puppet theatre festival in Bochum on 7 May.展开更多
The tight-binding Harrison model and Green＇s function approach have been utilized in order to investigate the contribution of hybridized orbitals in the electronic density of states（DOS） and electronic heat capacit...The tight-binding Harrison model and Green＇s function approach have been utilized in order to investigate the contribution of hybridized orbitals in the electronic density of states（DOS） and electronic heat capacity（EHC） for four hydrogenated structures, including monolayer chair-like, table-like, bilayer AA- and finally AB-stacked graphene. After hydrogenation, monolayer graphene and bilayer graphene are behave as semiconducting systems owning a wide direct band gap and this means that all orbitals have several states around the Fermi level. The energy gap in DOS and Schottky anomaly in EHC curves of these structures are compared together illustrating the maximum and minimum band gaps are appear for monolayer chair-like and bilayer AA-stacked graphane, respectively. In spite of these, our findings show that the maximum and minimum values of Schottky anomaly appear for hydrogenated bilayer AA-stacked and monolayer table-like configurations, respectively.展开更多
The theoretical model of random sequence of exponential attenuate acoustic pulses caused by ship propeller cavitation noise is presented in this paper. Based on it, the spectrum formula of propeller cavitation noise h...The theoretical model of random sequence of exponential attenuate acoustic pulses caused by ship propeller cavitation noise is presented in this paper. Based on it, the spectrum formula of propeller cavitation noise has been derived. It is shown that propeller cavitation noise is composed of continual spectrum and separable line spectrum. The relative amplitude of line spectrum of propeller cavitation noise depends on random swing of acoustic pulse front edge time. In high frequency, line spectrum components in noise approach to zero, and in lower frequency region, line spectrum is much higher than correspondent continual spectrum.The continual spectrum decreases with frequency as inverse square law in high frequency, and increases with frequency square in low frequency, and the spectrum peaks exist in certain lower frequency. The agreement between above mentioned theoretical results and existent measured data is very good.展开更多
猴桥钼矿位于云南腾冲县境内,大地构造上隶属青藏高原南缘怒江缝合带与密支那缝合带之间的腾冲地块(Yin and Harrison,2000;莫宣学和潘桂棠,2006)。本文在详实的野外调查和室内矿相学研究的基础上,对猴桥钼矿床含矿石英脉中的流体包裹...猴桥钼矿位于云南腾冲县境内,大地构造上隶属青藏高原南缘怒江缝合带与密支那缝合带之间的腾冲地块(Yin and Harrison,2000;莫宣学和潘桂棠,2006)。本文在详实的野外调查和室内矿相学研究的基础上,对猴桥钼矿床含矿石英脉中的流体包裹体进行了岩相学观察和显微测温研究。展开更多
文摘BOLIVIA Alpacas at the launch ceremony of the International Year of the Camelids in La Paz on 7 May.US A qualifying race of the 2024 Miami Grand Prix in Miami on 4 May.CANADA The Harrison Tulip Festival is held in British Columbia on 2 May .GERMANY People walk past two parrot statues during the FIDENA puppet theatre festival in Bochum on 7 May.
文摘The tight-binding Harrison model and Green＇s function approach have been utilized in order to investigate the contribution of hybridized orbitals in the electronic density of states（DOS） and electronic heat capacity（EHC） for four hydrogenated structures, including monolayer chair-like, table-like, bilayer AA- and finally AB-stacked graphene. After hydrogenation, monolayer graphene and bilayer graphene are behave as semiconducting systems owning a wide direct band gap and this means that all orbitals have several states around the Fermi level. The energy gap in DOS and Schottky anomaly in EHC curves of these structures are compared together illustrating the maximum and minimum band gaps are appear for monolayer chair-like and bilayer AA-stacked graphane, respectively. In spite of these, our findings show that the maximum and minimum values of Schottky anomaly appear for hydrogenated bilayer AA-stacked and monolayer table-like configurations, respectively.
文摘The theoretical model of random sequence of exponential attenuate acoustic pulses caused by ship propeller cavitation noise is presented in this paper. Based on it, the spectrum formula of propeller cavitation noise has been derived. It is shown that propeller cavitation noise is composed of continual spectrum and separable line spectrum. The relative amplitude of line spectrum of propeller cavitation noise depends on random swing of acoustic pulse front edge time. In high frequency, line spectrum components in noise approach to zero, and in lower frequency region, line spectrum is much higher than correspondent continual spectrum.The continual spectrum decreases with frequency as inverse square law in high frequency, and increases with frequency square in low frequency, and the spectrum peaks exist in certain lower frequency. The agreement between above mentioned theoretical results and existent measured data is very good.
