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排序方式: 共有238条查询结果,搜索用时 15 毫秒
61.
欧泽兵 《中国个体防护装备》2011,(1):6-8
农业领域作业者的听力防护问题极少被关注,以农机噪声、养殖场噪声及其对作业者伤害调查数据看,农业噪声对作业者的危害不容忽视,给予作业特点和需求,需要选择合适的听力保护装备,并建立听力保护计划,保护在噪声环境中工作的农业作业者。 相似文献
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A new methodology for risk analysis, namely Laboratory Assessment and Risk Analysis – LARA, is proposed in the companion paper to assess risks in research/academia environment. The core of this methodology relies on defining the adequate role player factors to assess risks in research environment and their mathematical combination to quantify and assess the risk. Quantitative outcome of the analysis results in a Lab Criticity Index – LCI, constructed as a rather comprehensive function of probability, severity, risk worsening factors, research specificities and Hazard Detectability. Even though the LCI model can be used at this stage, its “surjective” and “linear” properties were outlined; the non differentiation between LCI factors remains to be solved.The present article addresses this problematic, bringing a solution based on a Multicriteria Decision Making – MCDM modeling, namely Analytic Hierarchy Process – AHP. This leads to a refined criticity index being “bijective” and unique for every combination of factors.A preliminary risk assessment based on the LARA methodology is discussed for a research lab working with lasers. 相似文献
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Nitrogenization is an effective method for improving the capacitive deionization(CDI) performance of porous carbon materials. In particular, polymer organic frameworks with heteroatom doping, containing an ordered pore structure and excellent electrochemical stability, are ideal precursors for carbon materials for high-performance CDI. In this study, a nitrogen-enriched micro-mesoporous carbon(NMC) electrode was fabricated by carbonizing a Schiff base network-1 at 500, 600, and 700 °C. Scanning ... 相似文献
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本文首先概论了纤维(织物)阻燃技术,其次重点讨论了两种含磷本质阻燃PA纤维,一种是由含磷羟基羧酸或含磷二元羧酸与己二胺及己二酸共缩聚而后纺丝制得.另一种是用螺环磷酰氯与PA66及PA6纤维反应制得,后者具膨胀性。最后是综述了纤维(织物)阻燃技术的最新进展,包括新型表面改性技术及纳米技术等。 相似文献
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Yin-Jou Chou Chia-Yu Ou Te-Yao Hsu Chia-Wei Liou Cheng-Feng Lee Dan-Ju Tso Yau-Huei Wei 《黑龙江环境通报》2004,24(5):367-370
We prenatally diagnosed MELAS syndrome in a fetus whose mother and older brother had the MELAS-specific A3243G mutation. The mutant mtDNA level of the amniotic fluid cells was not significantly different from that of the postnatal peripheral blood and hair follicle samples. The obstetrical course was uncomplicated except for transient exacerbation of the mother's diabetes, which required insulin control. At term, the infant was macrosomic, and the delivery was complicated by shoulder dystocia. MELAS syndrome in itself does not influence either the prenatal course of the mother or the fetal outcome. In contrast to the fulminating clinical course of this mother's first child, MELAS symptoms did not develop in her second child until age four, despite similar high tissue levels of mutant mtDNA. The phenotypic diversity in two offspring with similar higher levels of mutant mtDNA suggests that prenatal genetic diagnosis of cultured amniotic cells may yield results that are poor prognosticators of fetal outcome. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
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珠江口底栖生物重金属含量现状与评价 总被引:5,自引:0,他引:5
根据2003年的调查资料,结合国内外有关生物残毒理论,对珠江口海域底栖生物重金属含量现状进行分析与评价。结果表明,底栖生物中Hg、Ph、Cd、As含量较低,但甲壳动物和软体动物体内Ph和Cd具有潜在的严重积累问题;甲壳类Cd含量已严重超人体消费标准,软体类的Cd含量等于人体消费标准值,甲壳动物和软体动物的可食性应引起人们的关注。 相似文献
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Bio-invasion has caused serious ecosystem damage and enormous economic losses in China,and it has been the greatest factor to island bio-diversity reduction.Xiamen,as an important seaport with a relatively high conservation value,is particularly vulnerable to bio-invasion for its typical island ecosystem as well as frequent human-made disturbance.As a result of field surveys,literature review, and consultation with experts,a list of 67 alien plants identified as major invaders(12 species)and emerging inv... 相似文献