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传统环境艺术的文化与自然观
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作者 刘青砚 《东岳论丛》 CSSCI 北大核心 1995年第S1期92-95,共4页
传统环境艺术的文化与自然观刘青砚人类自摆脱了菇毛饮血的蒙昧时代,便彰明了文明历史的开始,在这悠悠漫长的历史进程中,我们的祖先们在不断地改进自己生存的环境、缔造自己栖息的家园中,悟示出生生不息的创造力和聪明智慧的想象力... 传统环境艺术的文化与自然观刘青砚人类自摆脱了菇毛饮血的蒙昧时代,便彰明了文明历史的开始,在这悠悠漫长的历史进程中,我们的祖先们在不断地改进自己生存的环境、缔造自己栖息的家园中,悟示出生生不息的创造力和聪明智慧的想象力。从为抵御酷暑严寒而“战天之举”的... 展开更多
关键词 REACTIVE POLLUTANT SECONDARY POLLUTANT PHOSGENE dry DEPOSITION WET DEPOSITION
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Spectral Characteristic of Phosgene in External Electric Field
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作者 Huan An Mei Xiang +1 位作者 Bumaliya Abulimiti Jingyan Zhen 《Journal of Electronic Research and Application》 2022年第2期1-9,共9页
Phosgene is highly toxic, and it plays a role in the depletion of the ozone layer. The ground state geometric structure and spectral characteristic of phosgene in various external electric fields were calculated via t... Phosgene is highly toxic, and it plays a role in the depletion of the ozone layer. The ground state geometric structure and spectral characteristic of phosgene in various external electric fields were calculated via the density-functional theory (DFT) and time-dependent density-functional theory (TDDFT) with the B3LYP/6-31+G(d) basis set. With external electric field, the structure of phosgene changed significantly. With increasing electric field, the bond lengths of 1C-3Cl and 1C-4Cl increased;the total energy and energy gap initially increased and then decreased, whereas the dipole moment initially decreased and then increased. Most of the IR vibrational frequencies were redshifted. The wavelength of the singlet excited state increased, reflecting a red shift, and the oscillator strengths of most transitions belonged to forbidden transitions. These results are of great significance for studying the dissociation of phosgene in external electric field. 展开更多
关键词 Density-functional theory PHOSGENE Spectrum characteristic External electric field Molecular dynamics
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Polyaniline Nanofiber Composites with Amines:Novel Materials for Phosgene Detection 被引量:2
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作者 Shabnam Virji Robert Kojima +3 位作者 Jesse D.Fowler Joey G.Villanueva Richard B.Kaner Bruce H.Weiller 《Nano Research》 SCIE EI CSCD 2009年第2期135-142,共8页
Several orders of magnitude of change in resistance are observed upon chemical doping and dedoping of the conducting polymer polyaniline.This large conductivity range can be utilized to make sensitive chemical sensors... Several orders of magnitude of change in resistance are observed upon chemical doping and dedoping of the conducting polymer polyaniline.This large conductivity range can be utilized to make sensitive chemical sensors.Polyaniline,in its nanofiber form,has even greater sensing capabilities due to the small fiber diameters,high surface area,and porous nanofiber network that enhances gas diffusion into the fibers.Polyaniline nanofibers have been synthesized using a rapid mixing method and dispersed in water allowing them to be easily modified with water soluble agents,making new composite materials.Polyaniline nanofiber composite materials can be used to enhance detection of analytes that unmodified polyaniline would not otherwise be able to detect.The detection mechanism involves the reaction of an additive with the analyte to generate a strong acid that is easily detected by polyaniline,resulting in orders of magnitude changes in resistance.The reaction of the additive alone with the analyte produces no electrical response,however.In this paper,an array of amine-polyaniline nanofiber composite materials is investigated for the detection of phosgene gas.The influence of environmental conditions such as humidity and temperature are examined and a detection mechanism is presented. 展开更多
关键词 Polyaniline nanofibers conducting polymer AMINES chemical sensor PHOSGENE
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