The frontier orbitals HOMO and LUMO of the fullerene C_(60) has been given in a system of 60 motion-coordinates, of which each origin is at each C atom of fullerene C_(60) and each z-axis is in the direction perpendic...The frontier orbitals HOMO and LUMO of the fullerene C_(60) has been given in a system of 60 motion-coordinates, of which each origin is at each C atom of fullerene C_(60) and each z-axis is in the direction perpendicular to C_(60)'S spherical surface. In this motion-coordinate system the HOMO and LUMO of fullerene C_(60) obviously display characteristics of spherical n-molecular orbitals π_n. The Fenske-Hall quantum-chemical method is used in calculation for the electronic structure of the fullerene C_(60).展开更多
THE Missing Gun is a shortstory by another author, anddirector Lu Chuan adaptedit to a film, the scenario ofwhich he later expanded into a100,000-character novel.
LIU Jie still remembers the challenges she faced in the fight against the AIDS epidemic during her stint as a medical volunteer in Nigeria six years ago. Ironically, it was not the lack of medicine or funding that was...LIU Jie still remembers the challenges she faced in the fight against the AIDS epidemic during her stint as a medical volunteer in Nigeria six years ago. Ironically, it was not the lack of medicine or funding that was the biggest hurdle, but the difficulty in effectively delivering the treatment drugs and services.展开更多
Our planet, Earth, contains an enormous amount of heat just right under our feet. Harnessing this heat from 2 to 5 krn below is one of the great challenges of the 21st century, because this can solve many of the curre...Our planet, Earth, contains an enormous amount of heat just right under our feet. Harnessing this heat from 2 to 5 krn below is one of the great challenges of the 21st century, because this can solve many of the currently urgent problems in mega-cities, such as inexpensive domestic heating and airconditioning, electric power consumption and the cure of ram- pant air pollution. Around 40 TW heat are released at a steady rate by the Earth partly due to natural radioactive decay and partly due to the action inside the core. We would like to stress here that the depth of the isotherm of 200℃ （minimum tem- perature for efficient generation of electricity） varies around the globe. In general, this depth would be less than 10 km deep. Therefore these heat sources would provide ubiquitous ample, clean and sustainable electricity. In addition to this sustainable resource the potential of geothermal energy use is much greater, because it allows effective heat mining of the Earth. Geothermal energy is most commonly exploited in volcanic areas where magma is close to the surface and brings up the heat from deeper down. The largest geothermal power plant of this style is the Geysers in California, which with 1 GW power production rivals nuclear power plants.展开更多
文摘The frontier orbitals HOMO and LUMO of the fullerene C_(60) has been given in a system of 60 motion-coordinates, of which each origin is at each C atom of fullerene C_(60) and each z-axis is in the direction perpendicular to C_(60)'S spherical surface. In this motion-coordinate system the HOMO and LUMO of fullerene C_(60) obviously display characteristics of spherical n-molecular orbitals π_n. The Fenske-Hall quantum-chemical method is used in calculation for the electronic structure of the fullerene C_(60).
文摘THE Missing Gun is a shortstory by another author, anddirector Lu Chuan adaptedit to a film, the scenario ofwhich he later expanded into a100,000-character novel.
文摘LIU Jie still remembers the challenges she faced in the fight against the AIDS epidemic during her stint as a medical volunteer in Nigeria six years ago. Ironically, it was not the lack of medicine or funding that was the biggest hurdle, but the difficulty in effectively delivering the treatment drugs and services.
文摘Our planet, Earth, contains an enormous amount of heat just right under our feet. Harnessing this heat from 2 to 5 krn below is one of the great challenges of the 21st century, because this can solve many of the currently urgent problems in mega-cities, such as inexpensive domestic heating and airconditioning, electric power consumption and the cure of ram- pant air pollution. Around 40 TW heat are released at a steady rate by the Earth partly due to natural radioactive decay and partly due to the action inside the core. We would like to stress here that the depth of the isotherm of 200℃ （minimum tem- perature for efficient generation of electricity） varies around the globe. In general, this depth would be less than 10 km deep. Therefore these heat sources would provide ubiquitous ample, clean and sustainable electricity. In addition to this sustainable resource the potential of geothermal energy use is much greater, because it allows effective heat mining of the Earth. Geothermal energy is most commonly exploited in volcanic areas where magma is close to the surface and brings up the heat from deeper down. The largest geothermal power plant of this style is the Geysers in California, which with 1 GW power production rivals nuclear power plants.
