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621.
The bronchial dosimeter for Rn progeny proposed by Yu and Guan in 1998 was employed to survey the bronchial dose from Rn progeny in 30 residences in Hong Kong. An average bronchial deposition fraction of Rn progeny was obtained as 0.0334, which gave an average dose conversion factor (DCF) of 8.5 mSv WLM-1. The mean values of potential alpha energy concentration (PAEC) deposited in the tracheobronchial region (PAECT-B), total PAEC in air (PAECT), annual effective dose (E), concentration of Rn gas (RC) and annual dose conversion factor (ADCF) for all the residential sites combined were 0.11 +/- 0.05, 3.1 +/- 1.4 mWL, 1.2 +/- 0.5 mSv yr-1, 23 +/- 10 Bq m-3 and 0.055 +/- 0.020 (mSv yr-1 per Bqm-3), respectively, with air-conditioned sites (AC sites) and non-AC sites having significantly different mean ADCF values. The indoor relative humidity affected PAECT and RC with high confidence levels (> 95%). 相似文献
622.
在环境保护工作由污染问题治现向清洁生产转变过程中,中国沿海开放地区、外资,合资、集体和个体企业在其工业结构中所占比重较大,且要求有良好投资环境,当前控制工业污染,须按社会主义市场经济规律征收资源费和排污费,同时要加强环境规划,建立环境管理系统,有效调工业污原杂源,为保证受损环境得以恢复,须加强环境建设和环境投资。 相似文献
623.
Peng Jia-Shi Guan Yu-Hao Lin Xian-Jing Xu Xiao-Jing Xiao Lu Wang Hai-Hua Meng Shuan 《Environmental geochemistry and health》2021,43(4):1599-1607
Environmental Geochemistry and Health - Hyperaccumulator plants are ideal models for investigating the regulatory mechanisms of plant metal homeostasis and environmental adaptation due to their... 相似文献
624.
Hongyuan Wang Xiaolu Jiang Ya He Huashi Guan 《Frontiers of Environmental Science & Engineering in China》2009,3(2):194-199
Four typical coastal sites (rocky shore, sandy shore, mud flat shore, and artificial harbor) at the Yellow Sea were chosen
to investigate the spatial and seasonal variations in bacterial communities. This was accomplished by using terminal restriction
fragment length polymorphism (T-RFLP) analysis of PCR amplified 16S rDNA fragments. Two kinds of tetrameric restriction enzymes,
HhaI and MspI, were used in the experiment to depict the bacterial community diversity in different marine environments. It was found
that the community compositions digested by the two enzymes separately were different. However, the results of bacterial community
diversity derived from them were similar. The MDA analysis results of T-RFLP profiles coming from HhaI and MspI both exhibited a significant seasonal community shift for bacteria and a relatively low spatial variation among the four
locations. With HhaI as the sample, the pair wise T-tests also revealed that variations were minor between each pair of marine environments, with R ranging from 0.198 to 0.349. However, the bacterial community structure in the mud flat site depicted a larger difference
than each of the other three sites (R ranging from 0.282 to 0.349). 相似文献
625.
2008年5月12日四川省汶川8.0级地震是由于青藏高原的挤压应力在龙门山断裂集中释放.北川位于龙门山断裂的北段,野外考察结果表明,在主断裂方向北川县城可观测到两条断裂,并且产生了明显的地表破裂,走向均为北东30°~50°,主断裂方向地表破裂约10 km,具有明显挤压逆断层特征,上盘以60°~80°高角度向北东逆冲,断层垂直位移量3~4m,水平位移量0~2 m.主断裂的地表破裂集中位于两个地层的不整合面上,上盘为寒武系细砂岩、砂页岩,下盘为泥盆系白云岩、白云质灰岩.另外在北川县城北部发现次级断裂一条,走向北西30°,地表破裂长度约4 km,表现为正断层特征.这些破裂都直接或间接受地下深部构造的控制. 相似文献
626.
Although surface complexation models have been widely used to describe the adsorption of heavy metals, few studies have verified the feasibility of modeling the adsorption kinetics, edge, and isotherm data with one pH-independent parameter. A close inspection of the derivation process of Langmuir isothermrevealed that the equilibriumconstant derived from the Langmuir kinetic model, KS-kinetic, is theoretically equivalent to the adsorption constant in Langmuir isotherm, KS-Langmuir. The modified Langmuir kinetic model (MLK model) and modified Langmuir isothermmodel (MLImodel) incorporating pH factor were developed. The MLKmodel was employed to simulate the adsorption kinetics of Cu(II), Co(II), Cd(II), Zn(II) and Ni(II) on MnO2 at pH 3.2 or 3.3 to get the values of KS-kinetic. The adsorption edges of heavy metals could be modeled with the modified metal partitioning model (MMP model), and the values of KS-Langmuirwere obtained. The values of KS-kinetic and KS-Langmuir are very close to each other, validating that the constants obtained by these two methods are basically the same. The MMP model with KS-kinetic constants could predict the adsorption edges of heavy metals on MnO2 very well at different adsorbent/adsorbate concentrations. Moreover, the adsorption isotherms of heavy metals on MnO2 at various pH levels could be predicted reasonably well by the MLI model with the KS-kinetic constants. 相似文献
627.
Environmental Chemistry Letters - Developing high-efficiency and stable photocatalysts able to accomplish spontaneous overall water splitting, without using sacrificial agents, is the ultimate goal... 相似文献
628.
Guo Zihao Zhang Shen Liang Yue Zhang Huanhuan Qian Xiangqun Qian Shaoping Sheng Kuichuan 《Journal of Polymers and the Environment》2022,30(3):1162-1169
Journal of Polymers and the Environment - In this study, polyethylene glycol (PEG) was introduced into PLA/BP/UFBC ternary biocomposites as a plasticizer to improve the toughness of the... 相似文献
629.
630.
以江西高速公路某弃土场为例,探讨红壤丘陵区弃土场植被恢复的关键技术,在了解弃土场气候特点及地质情况的基础上,通过测土配方,采用草灌混播方式,设置3种植被配置方案,包括植被配置1(狗牙根+百喜草+紫花苜蓿+白三叶+伞房决明+紫穗槐)、植被配置2(紫花苜蓿+白三叶+狗牙根+马棘+美丽胡枝子)、常规喷播(狗牙根+紫花苜蓿+马棘),2种基肥配置方案,包括基肥配置1(50 g/m2复合肥)、基肥配置2(100 g/m2复合肥),分析不同处理下植被恢复情况及土壤理化性质,并确定最佳组合。结果表明:植被配置1+基肥配置2恢复方式下植被长势好,密度较大,1个月后覆盖率达到80%,土壤理化性质较其他处理具有显著变化,与常规喷播相比,土壤容重减少0.17 g/cm3,土壤总孔隙度、有机质及碱解氮浓度分别提高了19.68%、62%和8%,有效解决了弃土场复绿覆盖不均匀、时间长的难题,可以起到预防和减轻水土流失的作用,具有一定的经济效益和较好的生态效益。 相似文献