本文采用巨正则蒙特卡洛(grand canonical Monte Carlo,GCMC)方法,基于UFF(universal force field)和TraPPE(transferable potentials for phase equilibria)力场,对ZIF-8(Zn)吸附NH_(3)进行了分子模拟研究,并结合分子模拟结果和吸附式...本文采用巨正则蒙特卡洛(grand canonical Monte Carlo,GCMC)方法,基于UFF(universal force field)和TraPPE(transferable potentials for phase equilibria)力场,对ZIF-8(Zn)吸附NH_(3)进行了分子模拟研究,并结合分子模拟结果和吸附式制冷热力学循环模型,研究了ZIF-8(Zn)/NH_(3)工质对的吸附性能和制冷性能。研究表明:在等温条件下,ZIF-8(Zn)对NH_(3)的吸附量随压力的增大而提高,298 K和398 K下饱和吸附量分别达到0.305 g/g和0.231 g/g;同一温度下的总吸附热也随压力的增大而上升,这主要归因于NH_(3)分子间相互作用产生吸附热的增加,而ZIF-8(Zn)与NH_(3)相互作用的吸附热维持在较稳定的状态;NH_(3)在ZIF-8(Zn)中的吸附密度分布结果表明NH_(3)在金属位点处被大量吸附,难以通过ZIF-8(Zn)部分孔径较小的孔道,成功通过孔道的NH_(3)在ZIF-8(Zn)的SOD笼内部聚集;该吸附式制冷工质对制冷性能稳定,对温度有较好的适应性。制冷温度为283 K(通风工况)的制冷系数为0.43,制冷温度为243 K(冷冻工况)的制冷系数仍能达到0.38。展开更多
Dali is an ancient city on the southwestern border of China＇ s territory, she sprouted seeds of human civilization, experienced the vicissitudes of the millennium,eventually formed a rich ethnic customs.She is ＂the ...Dali is an ancient city on the southwestern border of China＇ s territory, she sprouted seeds of human civilization, experienced the vicissitudes of the millennium,eventually formed a rich ethnic customs.She is ＂the cultural crossroads of the ancient capital of Asia＂ which is recognized by the world.However, the beauty of the past has been almost no advantage in today＇ s tourism industry accounts for Dianxi rapid development.Many traditional attractions false propaganda. Those views may already be the last generation of human memory even documented. Dali almost forgotten their own advantage in such under the impact,for the construction and development of cultural tourism in Dali, but also for thousands of years to live up to this cultural accumulation, this paper analyzes the development direction of the national Culture Tourism in Dali Dali from the perspective of the transformation.展开更多
文摘Dali is an ancient city on the southwestern border of China＇ s territory, she sprouted seeds of human civilization, experienced the vicissitudes of the millennium,eventually formed a rich ethnic customs.She is ＂the cultural crossroads of the ancient capital of Asia＂ which is recognized by the world.However, the beauty of the past has been almost no advantage in today＇ s tourism industry accounts for Dianxi rapid development.Many traditional attractions false propaganda. Those views may already be the last generation of human memory even documented. Dali almost forgotten their own advantage in such under the impact,for the construction and development of cultural tourism in Dali, but also for thousands of years to live up to this cultural accumulation, this paper analyzes the development direction of the national Culture Tourism in Dali Dali from the perspective of the transformation.
