Dechlorination of dichlorodiphenyltrichloroethane (DDT) by Fe/Pd bimetallic nanoparticles: Comparison with nZVI,degradation mechanism,and pathways

Frontiers of Environmental Science &; Engineering - Acclimation is the main method to enhance the productivity of microorganisms in environmental biotechnology, but it remains uncertain how...     

Using a sub-grid scale modeling approach to simulate the transport and fate of toxic air pollutants

Several air toxics are emitted from mobile sources on roadways and these emissions account for a significant fraction of the health risks to the population. In addition, health effect studies are now becoming more comprehensive and some account for the spatial heterogeneities of air pollutant concentration fields (as is the case near roadways). Standard models can simulate either the near-source concentration fields or the urban background, but no model can handle both spatial scales in the vicinity of roadways in a coherent and scientifically correct manner. Here, we present a model that provides such an integrated treatment by combining a grid-based air quality model of the urban background with a plume-in-grid representation of roadway emissions. The model is applied to simulate near-roadway concentrations due to emissions from a busy interstate highway in New York City. Qualitative comparisons with typical measured concentration profiles show that the model captures the observed features of toxic air pollutant concentrations near roadways.     

江苏省高风险移动放射源在线监管系统设计

为了满足国家有关高风险移动源监管工作要求,研制了具备全球定位系统(GPS)、无线射频识别、辐射剂量监控功能的监控终端硬件,并开发设计了高风险移动源实时监控系统软件平台。对该系统平台软件和监控终端的功能及应用情况进行了分析,针对监控终端结构设计、续航时间较短、耐用性较差、野外信号弱等问题提出后续改进建议。该监控系统可以有效实现高风险移动放射源的动态监控,进一步提升江苏省高风险移动放射源的监管技术水平。