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881.
掘进工作面贴附射流通风浓差理论研究 总被引:2,自引:0,他引:2
掘进工作面压入式通风形成的风流是贴附射流。根据流体力学和射流理论 ,通风射流体结构分为起始段和主体段。风筒出口风流是新鲜的 ,射流周围气体中污染物浓度高于射流体的浓度 ,与射流气体存在浓度差。因此 ,其通风射流为浓差射流。笔者分析了贴附射流主体段、起始段的轴心浓差和质量平均浓差 ,得出了计算模型。同时为研究压入式通风过程中污染物的分布提供了新的理论依据 相似文献
882.
883.
Shen Chao Zuo Zhenghong 《Environmental science and pollution research international》2020,27(35):43599-43614
Environmental Science and Pollution Research - In the past decades, the type of chemicals has gradually increased all over the world, and many of these chemicals may have a potentially toxic effect... 相似文献
884.
Qi Wang Mengfei Shen Wenjing Li Wanwan Li 《Journal of environmental science and health. Part. B》2013,48(10):810-816
AbstractPesticides are biological or chemical substances used to manage pests and diseases. Encapsulation of pesticides in biodegradable carriers creates a slow-release system that can improve water dispersibility and prolong residual activity. We prepared two kinds of poly (lactic-co-glycolic acid)(PLGA) nanoparticles (NPs) with polyvinyl alcohol (PVA) and sodium dodecyl sulfate (SDS) surfactants. These were used to encapsulate the fungicide fluazinam (Flu) against Rhizoctonia solani using the Shirasu Porous Glass (SPG) membrane emulsification method. Both nanoparticles had uniform spherical shapes with average diameters of 314.13?nm (SDS) and 612.80?nm (PVA). The slow-release microspheres had excellent sustained-release properties, resistance to UV degradation, storage stability, leaf surface coverage and antifungal efficacy compared to the commercial formulation. 相似文献
885.
Cheng Hou Xinbai Jiang Na Li Zhenhua Zhang Qian Zhang Jinyou Shen Xiaodong Liu 《Frontiers of Environmental Science & Engineering》2022,16(8):98
886.
Yan Guo Zibin Luo Junhao Shen Yu-You Li 《Frontiers of Environmental Science & Engineering》2022,16(7):84
887.
Ma Yuxia Wang Hang Cheng Bowen Shen Jiahui Li Heping Guo Yongtao Cheng Yifan 《Environmental science and pollution research international》2022,29(24):35760-35767
Environmental Science and Pollution Research - Previous studies have reported that daily average temperature is connected with respiratory diseases (RD), but proof is limited for the influence of... 相似文献
888.
Yue Dengyuan Shen Ting Mao Jiaqing Su Qing Mao Yingying Ye Xiaoqing Ye Ding 《Environmental science and pollution research international》2022,29(32):48233-48249
Environmental Science and Pollution Research - An increasing number of studies investigated the association between air pollution during pregnancy and the risk of eczema in offspring. However, no... 相似文献
889.
Yuan Lilai Liu Jia Huang Ying Shen Gongming Pang Sen Wang Chengju Li Yingren Mu Xiyan 《Environmental science and pollution research international》2022,29(58):87402-87412
Environmental Science and Pollution Research - To comprehensively understand the toxic risks of phthalates to aquatic ecosystems, we examined the acute toxicity of di-(2-ethylhexyl) phthalate... 相似文献
890.
Time-dependent recordkeeping fatigue among youth completing health diaries of unintentional injuries
PROBLEM: Increasingly, investigators are asking youth to self-report daily activity patterns and health outcomes in diary studies. This study assesses recordkeeping fatigue with respect to data quality and event reporting among youth participating in a health diary study. METHOD: Unintentional injury data were collected during a 13-week longitudinal diary study of Ohio youth exposed to agricultural hazards. Two analyses were conducted using data from 2000. Analysis 1 examined trends in discernable recordkeeping errors (DREs) over the course of follow-up. Analysis 2 assessed trends in injury reporting over follow-up. RESULTS: The percentage of items containing a DRE showed a slight, non-significant decline throughout follow-up. Injury reporting declined significantly (p<0.001) over follow-up. SUMMARY: There was no compelling evidence of respondent fatigue with respect to DREs. The observed decline in injury reporting is problematic because estimates of youth injury incidence in health diary studies may vary depending upon the length of the follow-up period. 相似文献