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931.
Bu Duo Yunchen Zhang Lingdong Kong Hongbo Fu Yunjie Hu Jianmin Chen Lin Li A. Qiong 《环境科学学报(英文版)》2015
To understand the composition and major sources of aerosol particles in Lhasa City on the Tibetan Plateau (TP), individual particles were collected from 2 February to 8 March, 2013 in Tibet University. The mean concentrations of both PM2.5 and PM10 during the sampling were 25.7 ± 21.7 and 57.2 ± 46.7 μg/m3, respectively, much lower than those of other cities in East and South Asia, but higher than those in the remote region in TP like Nam Co, indicating minor urban pollution. Combining the observations with the meteorological parameters and back trajectory analysis, it was concluded that local sources controlled the pollution during the sampling. Transmission electron microscopy (TEM) combined with energydispersive X-ray spectra (EDS) was used to study 408 particles sampled on four days. Based on the EDS analysis, a total of 8 different particle categories were classified for all 408 particles, including Si-rich, Ca-rich, soot, K-rich, Fe-rich, Pb-rich, Al-rich and other particles. The dominant elements were Si, Al and Ca, which were mainly attributed to mineral dust in the earth's crust such as feldspar and clay. Fe-, Pb-, K-, Al-rich particles and soot mainly originated from anthropogenic sources like firework combustion and biomass burning during the sampling. During the sampling, the pollution mainly came from mineral dust, while the celebration ceremony and religious ritual produced a large quantity of anthropogenic metal-bearing particles on 9 and 25 February 2013. Cement particles also had a minor influence. The data obtained in this study can be useful for developing pollution control strategies. 相似文献
932.
Studies on the effect of the chlorine content of chlorophenols (CPs) on their adsorption from aqueous solution by mesoporous SBA-15 are important in understanding the mechanisms of CP adsorption. In this study, three CPs with different degrees of chlorine content (i.e., 2-chlorophenol, 2,6-dichlorophenol and 2,4,6-trichlorophenol) were investigated. The effects of parameters such as temperature and solution pH were studied. The results showed that CP adsorption by SBA-15 increased with increasing number of chlorine substituents and depended strongly on the temperature and solution pH. Thermodynamic parameters such as Gibbs free energy change (ΔG0), enthalpy change (ΔH0) and entropy change (ΔS0) were also calculated. By comparison of the adsorption coefficient of CPs with varying physical-chemical properties (size, hydrophobicity and electron density), we propose that hydrophobic interactions between CPs and the SBA-15 surface, as well as electron donor-acceptor (EDA) complexes between oxygen of the siloxane surface of SBA-15 (e--donor) and the πup-system of the CPs (e--acceptor), were dominant adsorption mechanisms. 相似文献
933.
Life cycle assessment of mobile phone housing 总被引:2,自引:0,他引:2
The life cycle assessment of the mobile phone housing in Motorola(China) Electronics Ltd. was carried out, in which materials flows and environmental emissions based on a basic production scheme were analyzed and assessed. In the manufacturing stage, such primary processes as polycarbonate molding and surface painting are included, whereas different surface finishing technologies like normal painting, electroplate, IMD and VDM etc. were assessed. The results showed that housing decoration plays a significant role within the housing life cycle. The most significant environmental impact from housing production is the photochemical ozone formation potential.Environmental impacts of different decoration techniques varied widely, for example, the electroplating technique is more environmentally frieodly than VDM. VDM consumes much more energy and raw material. In addition, the results of two alternative scenarios of dematerialization showed that material flow analysis and assessment is very important and valuable in selecting an environmentally friendly process. 相似文献
934.
Xiaohua Fu Qingxing Zheng Guomin Jiang Kallol Roy Lei Huang Chang Liu Kun Li Honglei Chen Xinyu Song Jianyu Chen Zhenxing Wang 《Frontiers of Environmental Science & Engineering》2023,17(8):98
935.
Qian Li Zhaoyang Hou Xingyuan Huang Shuming Yang Jinfan Zhang Jingwei Fu Yu-You Li Rong Chen 《Frontiers of Environmental Science & Engineering》2023,17(6):68
936.
Few studies have identified determinants of delegation and consultation. To investigate this question further, we surveyed managers and subordinates in two samples and interviewed managers individually or in focus groups. The use of delegation and consultation with individual subordinates was determined in part by characteristics of the subordinates and the manager–subordinate relationship. More delegation was used for a subordinate who was competent, shared the leader's task objectives, had worked longer for the manager, was a supervisor also, and had a favorable exchange relationship with the manager. Consultation with a subordinate was predicted by goal congruence, subordinate job level, and quality of the leader–member exchange relationship. The managers acknowledged that developing subordinates and empowering them to do their work were important reasons for delegation, but many managers were reluctant to give up control over important decisions or assign an important task to an inexperienced subordinate. Copyright © 1999 John Wiley & Sons, Ltd. 相似文献
937.
938.
<正>新闻素材:2010年夏,因校舍需要进行抗震加固,北京市各区县部分中小学校根据需要提前放暑假。今年新学年开学前,北京市将完成对全市中小学每一栋校舍的抗震排查和鉴定工作。三年内,存在安全隐患的校舍都将完成抗震加固、迁移避险的工作。 相似文献
939.
940.
粉煤灰的多环芳烃在海水中的溶出 总被引:2,自引:0,他引:2
用荧光分光光度计测定浸泡粉煤灰海水中多环芳烃(PAHs)的含量,用反相高效液体色谱紫外检测器/荧光检测器测定海水浸泡前后粉煤灰中多环芳烃。热电厂粉煤灰在海水中2种溶出结果表明,其粉煤灰在海水中的静态溶出和吸附可逆,PAHs的溶出极少。热电厂粉煤灰倾倒于海水中溶出的多环芳烃对海洋环境污染甚微。 相似文献