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Metanalysis: Respiratory Effects in the General Population Exposed to Urban Pollution

Journal of Environmental Protection 2011年第7期2卷 974-981页

作者： Angela Sancini Francesco Tomei Assunta Capozzella Alessandro Pacchiarotti simone de sio Gianfranco Tomei Paola Palermo Manuela Ciarrocca 不详

Aim: The purpose of this study was to evaluate spirometric lung function parameters in the general population exposed to urban pollution and confirm the existence of an association between exposure to environmental pollutants and effects from these products and which respiratory parameters are associated to urban pollution in general population. Methods: This study is a systematic research of all articles on the assessment of respiratory effects on general population exposed to urban pollution, excluding studies on adolescents and children. The research included articles from January 2008 to May 2009. In the articles included in our meta-analysis, the exposed group is represented by general population aged between 15 and 75 years for both genders, resident in very polluted urban areas, while the control group is represented by general population resident in rural and suburban areas, where pollution is lower. Results: The results confirm the presence of statistically significant effects of urban pollution on the respiratory system for cough, phlegm, shortness of breath/breathlessness, wheezing, FVC, FEV1, PEFR, chronic bronchitis, bronchial asthma, rhinitis, emphysema.

关键词： Urban Pollution Respiratory Symptoms on General Population Lung Disease Environmental Exposure

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Comparison of radiation degradation induced by x-ray and 3-MeV protons in 65-nm CMOS transistors

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Chinese Physics B 2016年第9期25卷 468-473页

作者：丁李利 simone Gerardin Marta Bagatin Dario Bisello Serena Mattiazzo Alessandro Paccagnella State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear Technology RREACT group Department of Information EngineeringPadova University INFN

The total ionizing dose（TID） response of 65-nm CMOS transistors is studied by 10-ke V x-ray and 3-Me V protons up to 1 Grad（sio_2） total *** degradation levels induced by the two radiation sources are different to some *** main reason is the interface dose enhancement due to the thin gate oxide and the low energy *** holes＇ recombination also contributes to the *** to these two mechanisms,the influence of the dose rate is negligible.

关键词： total ionizing dose(TID) effects grad dose x-ray and protons 65-nm CMOS transistors

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Propulsion tests on ultra-high-temperature ceramic matrix composites for reusable rocket nozzles

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Journal of Advanced Ceramics 2023年第7期12卷 1345-1360页

作者： Diletta Sciti Antonio Vinci Luca Zoli Pietro Galizia simone Failla Stefano Mungiguerra Giuseppe D.Di Martino Anselmo Cecere Raffaele Savino Institute of Science Technology and Sustainability for Ceramics-National Research CouncilFaenza 48018Italy department of Industrial Engineering University of Naples Federico IINaples 80125Italy

Ultra-high-temperature ceramic matrix composites(UHTCMCs)based on a ZrB_(2)/SiC matrix have been investigated for the fabrication of reusable nozzles for *** de Laval nozzle prototypes,obtained by sintering with either hot pressing(HP)or spark plasma sintering(SPS),were tested 2-3 times in a hybrid rocket motor for proving *** were extracted after oxidation tests to study the microstructural changes and oxidative and thermomechanical stresses induced by the repeated *** to a reference graphite nozzle,no measurable erosion was observed for the UHTCMC-based *** oxidation mechanism consisted in the formation of a ZrO_(2)intermediate layer,with a liquid silicon oxide(sio_(2))layer on the surface that was displaced by the action of the gas flux towards the divergent part of the nozzle,protecting it from further *** specimens obtained by HP and SPS displayed similar performance,with very slight differences,which were attributed to small changes in *** tests demonstrated the capability of complex-shaped prototypes made of the developed UHTCMCs to survive repeated exposure to environments representative of a realistic space propulsion application,for overall operating time up to 30 s,without any failure nor measurable erosion,making a promising step towards the development of reusable rocket components.

关键词： ultra-high-temperature ceramics(UHTCs) ceramic matrix composites(CMCs) propulsion oxidation resistance nozzle prototypes

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电弧炉炉渣的显微结构和化学特性

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冶金分析 2012年第3期32卷 7-13页

作者： Mapelli C Mombelli D Gruttadauria A Baldizzone C Magni F Levrangi P L simone P 米兰理工大学力学系费拉皮尔钢铁公司瓦尔萨比亚钢铁公司蒙大拿公司

炉渣材料代替水泥是一个很好的选择。特别是电弧炉(EAF)熔融过程中产生的炉渣,可作为填埋道路场地和生产混凝土的材料。但是炉渣中含有污染性的化学元素,如铬、钡、钒、钼等,使其应用受到限制。本文对两个生产钢筋的意大利炼钢厂的炉渣... 详细信息

炉渣材料代替水泥是一个很好的选择。特别是电弧炉(EAF)熔融过程中产生的炉渣,可作为填埋道路场地和生产混凝土的材料。但是炉渣中含有污染性的化学元素,如铬、钡、钒、钼等,使其应用受到限制。本文对两个生产钢筋的意大利炼钢厂的炉渣进行了测试。结果表明,炉渣的化学成分在一个范围内,且在此范围内炉渣显示了一个释放行为;基本组分(如CaO、sio2、Al2O3、MgO等)的比例对炉渣的释放行为有着显著影响。采用光学碱度法表征了材料的化学成分;并采用扫描电子显微镜研究了炉渣的显微结构,确认了炉渣中存在的主要物相、化学成分和溶解在每一物相中的污染元素。对化学分析、显微结构分析和释放性试验结果进行综合分析,确定了具体的化学成分范围来预防危险的化学释放,这种分析方法为确定正确处理炉渣的程序具有重要的指导意义。

关键词：炉渣电弧炉光学碱度浸出试验污染元素扫描电子显微镜

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