The Experts below are selected from a list of 14781 Experts worldwide ranked by ideXlab platform
Alan W. Gertler - One of the best experts on this subject based on the ideXlab platform.
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Analysis of the effectiveness of control measures to mitigate road dust emissions in a regional network
Transportation Research Part D: Transport and Environment, 2012Co-Authors: Dongzi Zhu, Hampden Kuhns, John A. Gillies, Vicken Etyemezian, Scott C. Brown, Alan W. GertlerAbstract:Abstract The effectiveness of control measures to reduce road dust emissions is analyzed using a year’s data of road dust emissions collected with a mobile sampling platform and a survey of road maintenance practices in the Lake Tahoe Basin of Nevada and California US. Attributes such as sweeping practices, anti-icing, shoulder improvement, pavement condition, trackout, and Abrasive Material from road segments were analyzed with a feature subset selection algorithm. Street sweeping was found to be an effective means of controlling dust emissions from roads. Road dust from dirty tertiary roads served as a continuous source of suspendable Material for adjacent high-speed roads in the winter time. To be most effective, emission control strategies require that not only primary roads, but all roads be swept after snow storms to recover applied Abrasive Material.
Vyacheslav Ya. Rodak - One of the best experts on this subject based on the ideXlab platform.
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Influence of water pressure and Abrasive Materials nature on the duration of the high-pressure Abrasive water jet cutting in building structures
Journal of Civil Protection, 2020Co-Authors: Dmitriy V. Vasilevich, Vyacheslav Lakhvich, Vyacheslav Ya. RodakAbstract:Purpose. Improving the efficiency of Abrasive water jet cutting by choosing rational process parameters and Abrasive Material. Methods. Full-scale tests within the program of a full-factor experiment on cutting a high-pressure barrel into building structures, statistical data processing. Findings. Experimental data on the time of the high-pressure cutting barrel into building structures made of various Materials have been obtained. Application field of research. The research results can be used by fire rescue units in emergency response.
K. Osseo-asare - One of the best experts on this subject based on the ideXlab platform.
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Surface Chemical Processes in Chemical Mechanical Polishing Relationship Between Silica Material Removal Rate and the Point of Zero Charge of the Abrasive Material
Journal of The Electrochemical Society, 2002Co-Authors: K. Osseo-asareAbstract:Chemical mechanical polishing (CMP) of a silica substrate Is visualized as a two-step process involving release of substrate-derived species into solution (dissolution), followed by adsorption of these species by Abrasive particles. The adsorption is quantified by treating it as a surface complexation process. Mass action equations are provided for the complex-formation reaction as well as protonation and deprotonation of surface hydroxyls present on the Abrasive particles. By combining these equations with mass balances on surface sites and dissolved species, it is shown that the surface concentration of substrate-derived species (and, therefore, the Material removal rate) goes through a maximum as the point of zero charge (pzc) of the Abrasive particle increases. Further, it is shown that the surface concentration of substrate-derived species (and, therefore, the Material removal rate) is highest for the Abrasive Material whose pzc coincides with the pH of the polishing slurry.
A.p.m. Baptista - One of the best experts on this subject based on the ideXlab platform.
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Role of Abrasive Material on microabrasion wear tests
Wear, 2011Co-Authors: Francisco J. G. Silva, R. B. Casais, R. P. Martinho, A.p.m. BaptistaAbstract:a b s t r a c t Microabrasion wear tests with ballcratering configuration are widely used. Sources of variability are already studied by different authors and conditions for testing are parameterized by BS EN 10716: 2007 standard which refers silicon carbide as Abrasive. However, the use of other Abrasives is possible and allowed. In this work, ballcratering wear tests were performed using four different Abrasive particles of three dissimilar Materials: diamond, alumina and silicon carbide. Tests were carried out under the same conditions on a steel plate provided with TiB2 hard coating. For each Abrasive, five different test durations were used allowing understanding the initial wear phenomena. Composition and shape of Abrasive parti cles were investigated by SEM and EDS. Scar areas were observed by optical and electronic microscopy in order to understand the wear effects caused by each of them. Scar geometry and grooves were analyzed and compared. Wear coefficient was calculated for each situation. It was observed that diamond parti cles produce welldefined and circular wear scars. Different silicon carbide particles presented dissimilar results as consequence of distinct particle shape and size distribution.
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Role of Abrasive Material on micro-abrasion wear tests
Wear, 2011Co-Authors: Francisco J. G. Silva, R. B. Casais, R. P. Martinho, A.p.m. BaptistaAbstract:Micro-abrasion wear tests with ball-cratering configuration are widely used. Sources of variability are already studied by different authors and conditions for testing are parameterized by BS EN 1071-6: 2007 standard which refers silicon carbide as Abrasive. However, the use of other Abrasives is possible and allowed. In this work, ball-cratering wear tests were performed using four different Abrasive particles of three dissimilar Materials: diamond, alumina and silicon carbide. Tests were carried out under the same conditions on a steel plate provided with TiB2 hard coating. For each Abrasive, five different test durations were used allowing understanding the initial wear phenomena. Composition and shape of Abrasive particles were investigated by SEM and EDS. Scar areas were observed by optical and electronic microscopy in order to understand the wear effects caused by each of them. Scar geometry and grooves were analyzed and compared. Wear coefficient was calculated for each situation. It was observed that diamond particles produce well-defined and circular wear scars. Different silicon carbide particles presented dissimilar results as consequence of distinct particle shape and size distribution
Dongzi Zhu - One of the best experts on this subject based on the ideXlab platform.
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Analysis of the effectiveness of control measures to mitigate road dust emissions in a regional network
Transportation Research Part D: Transport and Environment, 2012Co-Authors: Dongzi Zhu, Hampden Kuhns, John A. Gillies, Vicken Etyemezian, Scott C. Brown, Alan W. GertlerAbstract:Abstract The effectiveness of control measures to reduce road dust emissions is analyzed using a year’s data of road dust emissions collected with a mobile sampling platform and a survey of road maintenance practices in the Lake Tahoe Basin of Nevada and California US. Attributes such as sweeping practices, anti-icing, shoulder improvement, pavement condition, trackout, and Abrasive Material from road segments were analyzed with a feature subset selection algorithm. Street sweeping was found to be an effective means of controlling dust emissions from roads. Road dust from dirty tertiary roads served as a continuous source of suspendable Material for adjacent high-speed roads in the winter time. To be most effective, emission control strategies require that not only primary roads, but all roads be swept after snow storms to recover applied Abrasive Material.