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排序方式: 共有319条查询结果,搜索用时 15 毫秒
311.
Environmental Fluid Mechanics - This paper presents a numerical model study on the ice cover effect on bank stability in non-cohesive alluvial channels. The model consists of a coupled... 相似文献
312.
Hung CL Xu Y Lam JC Connell DW Lam MH Nicholson S Richardson BJ Lam PK 《Environmental pollution (Barking, Essex : 1987)》2006,144(1):190-196
The Indo-Pacific humpback dolphin is considered threatened due to several factors including pollution in Hong Kong and the risks due to consumption of fish tainted with polychlorinated biphenyls (PCBs) and organochlorine pesticides were assessed. Six species of fish Collichthys lucida, Pseudosciaena crocea, Johnius sp., Thryssa sp., Mugil sp. and Trichiurus sp., which comprise the main prey species of humpback dolphins were collected for analyses. Risks due to total PCBs, total TEQs, PCB 118 and the pesticides were assessed with the use of toxicity reference values as the threshold reference benchmarks. The calculated risk quotients (RQs) showed that the risks associated with organochlorines were generally low. The highest RQ was associated with total TEQs suggesting that dioxin-like PCBs may pose the highest risk to the dolphins. The HCHs, total PCBs and heptachlor had comparatively high RQs and thus they should also be the priority organochlorines that would require further investigation. 相似文献
313.
The PCDD/Fs in the ambient air associated with concentration and dry deposition flux of four seasons were characterized in rural area. The mean PCDD/F concentrations were 0.342, 0.221, 0.675, 0.741 pg m(-3) and the mean I-TEQ values were 0.027, 0.016, 0.024, 0.063 pg m(-3) in spring, summer, fall and winter, respectively. Ambient air in winter was higher by a factor of 3.4 and 3.9 for PCDD/F concentration and I-TEQ, respectively, than in summer. The study area is located in a Tropical region. Hence, domestic heating is not found in this area and is not responsible for the elevated winter concentration in comparison to other studies. A smooth plate with a sharp leading edge that is pointed into the wind by a wind vane was used for measuring dry deposition flux of PCDD/Fs. Atmospheric dry deposition fluxes of total PCDD/Fs were 140, 116, 137, and 207 pg m(-2)day(-1) in spring, summer, fall, and winter, respectively, and averaged approximately 150 pg m(-2)day(-1). The total dry deposition flux was found to decrease as the temperature increased. Calculated dry deposition velocities of total PCDD/Fs were 0.45, 0.52, 0.32 and 0.39 cm s(-1) in spring, summer, fall, and winter, respectively, and averaged 0.42 cm s(-1). 相似文献
314.
Contamination status of persistent organochlorines in human breast milk from Japan: recent levels and temporal trend 总被引:1,自引:0,他引:1
Kunisue T Muraoka M Ohtake M Sudaryanto A Minh NH Ueno D Higaki Y Ochi M Tsydenova O Kamikawa S Tonegi T Nakamura Y Shimomura H Nagayama J Tanabe S 《Chemosphere》2006,64(9):1601-1608
Contamination levels of persistent organochlorines (OCs) such as polychlorinated dibenzo-p-dioxins (PCDDs), dibenzofurans (PCDFs), biphenyls (PCBs), dichlorodiphenyltrichloroethane and its metabolites (DDTs), hexachlorocyclohexane isomers (HCHs), hexachlorobenzene (HCB), and chlordane compounds (CHLs) was examined in human breast milk collected during 2001-2004 from Fukuoka prefecture in Japan. The concentrations of OCs such as dioxins and related compounds, DDTs, CHLs and HCB in human breast milk from primiparae were comparable to or slightly higher than the data obtained during 1998, indicating that the levels of these contaminants in Japanese human breast milk have not decreased since 1998 and Japanese are continuously exposed to these chemicals, presumably via fish intake. In addition, OC levels in human breast milk from primiparae were significantly higher than those from multiparae, implying elimination of OCs via lactation. Furthermore, significant positive correlations were observed between levels of OCs in human breast milk and the age of primiparae. These results indicate that the mothers with higher age may transfer higher amounts of OCs to the first infant than to the infants born afterwards through breast-feeding, and hence the first born children might be at higher risk by OCs. 相似文献
315.
Chang Shih-An Kuan Chia-Hsuan Hung Chi-Yen Wang Tai-Chi Chen Chen Yu-Sheng 《Environmental science and pollution research international》2022,29(57):85669-85675
Environmental Science and Pollution Research - This study aimed to investigate the impact of weather conditions on the daily incidence of the COVID-19 pandemic in late spring 2021 in Taiwan, which... 相似文献
316.
Hung Ngo Thai Trang Nguyen Thu Thang Nguyen Thanh 《Environmental science and pollution research international》2022,29(40):60098-60116
Environmental Science and Pollution Research - Environmental quality and economic activity have a strong relationship. Carbon emissions remain one of the world’s most dangerous environmental... 相似文献
317.
Lin Ya-Wen Peng Sheng-Yuan Lee Wei-Hao Lin Yan-Yu Hung Ming-Jui Lin Kae-Long 《Journal of Material Cycles and Waste Management》2023,25(2):1069-1081
Journal of Material Cycles and Waste Management - This study developed a novel approach to the hydrothermal synthesis of eco-hydroxyapatite (eco-HPA) from recycled limestone sludge for the removal... 相似文献
318.
Radwan Mohammed K. H. Onn Chiu Chuen Mo Kim Hung Yap Soon Poh Chin Ren Jie Lai Sai Hin 《Environment, Development and Sustainability》2022,24(4):4751-4785
Environment, Development and Sustainability - Coal fly ash and granulated ground blast furnace slag (GGBS) are more widely used as supplementary cementitious materials in cement production. This... 相似文献
319.
Dat Nguyen Duy Thuan Ngo Thi Hoang Nhung Thi-Tuyet Tran Hiep Ngoc Hien To Thi Tran Khoi Tien Chang Moo Been 《Environmental science and pollution research international》2022,29(29):44054-44066
Environmental Science and Pollution Research - This is the first investigation on overall characteristics of 25 polycyclic aromatic hydrocarbons (PAHs) (15 PAHs regulated by US-EPA (excluding... 相似文献