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Process−microstructure−properties relationship in Al−CNTs−Al2O3 nanocomposites manufactured by hybrid powder metallurgy and microwave sintering process

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Transactions of Nonferrous Metals Society of China 2020年第9期30卷 2339-2354页

作者： Meysam TOOZANDEHJANI Farhad OSTOVAN Khairur Rijal JAMALUDIN astuty amrin Khamirul Amin MATORI Ehsan SHAFIEI Razak Faculty of Technology and Informatics Universiti Teknologi Malaysia Kuala Lumpur54100 Jalan SemarakKuala LumpurMalaysia Department of Material Science and Engineering Islamic Azad UniversityBandar Abbas BranchBandar AbbasHormozganIran Department of Physics Faculty of ScienceUniversiti Putra Malaysia43400SerdangSelangorMalaysia

Al−2CNTs−xAl2O3 nanocomposites were manufactured by a hybrid powder metallurgy and microwave sintering *** correlation between process-induced microstructural features and the material properties including physical and mechanical properties as well as ultrasonic parameters was *** was found that physical properties including densification and physical dimensional changes were closely associated with the morphology and particle size of nanocomposite *** maximum density was obtained by extensive particle refinement at milling time longer than 8 h and Al2O3 content of 10 wt.%.Mechanical properties were controlled by Al2O3 content,dispersion of nano reinforcements and grain *** optimum hardness and strength properties were achieved through incorporation of 10 wt.%Al2O3 and homogenous dispersion of CNTs and Al2O3 nanoparticles(NPs)at 12 h of milling which resulted in the formation of high density of dislocations and extensive grain size *** both longitudinal and shear velocities and attenuation increase linearly by increasing Al2O3 content and milling *** variation of ultrasonic velocity and attenuation was attributed to the degree of dispersion of CNTs and Al2O3 and also less inter-particle spacing in the *** larger Al2O3 content and more homogenous dispersion of CNTs and Al2O3 NPs at longer milling time exerted higher velocity and attenuation of ultrasonic wave.

关键词： hybrid composite aluminum composites powder metallurgy microwave sintering microstructure mechanical properties ultrasonic velocity ultrasonic attenuation

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Human Health Cost of Air Pollution in Kazakhstan

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Journal of Environmental Protection 2013年第8期4卷 869-876页

作者： Ussen Kenessariyev Alexander Golub Michael Brody Askhat Dosmukhametov Meiram amrin Aya Erzhanova Dinara Kenessary Department of Environmental Science American University Washington DC USA Department of Public Health Kazakh National Medical University Named after S.D. Asfendiyarov Almaty Department of Public Health Kazakh National Medical University Named after S.D. Asfendiyarov Almaty Kazakhstan

Kazakhstan, like other former Soviet Republics, inherited a number of serious environmental problems. Air pollution is one of these serious problems, leading to significant environmental health effects on the population of Kazakhstan. This study provides a baseline analysis of health damages from air pollution, based on readily available information. Mean estimates of mortality risk attributable to air pollution are about 16,000 cases per year with a 95% confidence level of the risk not exceeding 25,500. Even taking into account all the uncertainties related to the collection and processing of primary data, as well as the application of risk analysis methodology, we conclude that air pollution in Kazakhstan constitutes a significant contribution to the environmental burden of diseases. In relative terms, the impact of air pollution on premature mortality in Kazakhstan is notably higher than in Russia and the Ukraine.

关键词： Air Pollution PM Kazakhstan Health Risk Uncertainty

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