The Experts below are selected from a list of 212406 Experts worldwide ranked by ideXlab platform
Francesco Pellicano - One of the best experts on this subject based on the ideXlab platform.
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Nonlinear vibration of the spiral bevel gear with a novel tooth surface Modification Method
Meccanica, 2019Co-Authors: Farhad S. Samani, Moslem Molaie, Francesco PellicanoAbstract:The issue of gear noise is fairly common in power transmission systems. This noise largely stems from the gear pairs vibration triggered by transmission error excitation. This is mainly caused by tooth profile errors, misalignment and tooth deflections. This research endeavors to examine nonlinear spiral bevel gears vibration with the innovative Method of tooth surface Modification. To design spiral bevel gears with the higher-order transmission error (HTE), the nonlinear vibration of a novel Method is investigated. The meshing quality of the HTE spiral bevel gears, as the results demonstrate, sounds more suitable than of the meshing quality gears. Their design was made by means of the parabolic transmission error (PTE). The maximum time response root mean square of the HTE Method decreases by 44% concerning the PTE Method. The peak-to-peak of the transmission error is decreased by 35% via HTE overall frequency range. However, HTE Method is not able to decrease the vibration level on all frequency ratios.
Farhad S. Samani - One of the best experts on this subject based on the ideXlab platform.
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Nonlinear vibration of the spiral bevel gear with a novel tooth surface Modification Method
Meccanica, 2019Co-Authors: Farhad S. Samani, Moslem Molaie, Francesco PellicanoAbstract:The issue of gear noise is fairly common in power transmission systems. This noise largely stems from the gear pairs vibration triggered by transmission error excitation. This is mainly caused by tooth profile errors, misalignment and tooth deflections. This research endeavors to examine nonlinear spiral bevel gears vibration with the innovative Method of tooth surface Modification. To design spiral bevel gears with the higher-order transmission error (HTE), the nonlinear vibration of a novel Method is investigated. The meshing quality of the HTE spiral bevel gears, as the results demonstrate, sounds more suitable than of the meshing quality gears. Their design was made by means of the parabolic transmission error (PTE). The maximum time response root mean square of the HTE Method decreases by 44% concerning the PTE Method. The peak-to-peak of the transmission error is decreased by 35% via HTE overall frequency range. However, HTE Method is not able to decrease the vibration level on all frequency ratios.
Wonyong Choi - One of the best experts on this subject based on the ideXlab platform.
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surface Modification of tio2 photocatalyst for environmental applications
Journal of Photochemistry and Photobiology C-photochemistry Reviews, 2013Co-Authors: Hyunwoong Park, Yiseul Park, Wooyul Kim, Wonyong ChoiAbstract:This paper reviews recent studies on the semiconductor photocatalysis based on surface-modified TiO2 of which application is mainly focused on environmental remediation. TiO2 photocatalysis that is based on the photoinduced interfacial charge transfer has been extensively studied over the past four decades. A great number of Modification Methods of semiconductor photocatalysts have been developed and investigated to accelerate the photoconversion, to enable the absorption of visible light, or to alter the reaction mechanism to control the products and intermediates. In this regard, various Modification Methods of TiO2 are classified according to the kind of surface modifiers (metal-loading, impurity doping, inorganic adsorbates, polymer coating, dye-sensitization, charge transfer complexation) and their effects on photocatalytic reaction mechanism and kinetics are discussed in detail. Modifying TiO2 in various ways not only changes the mechanism and kinetics under UV irradiation but also introduces visible light activity that is absent with pure TiO2. Each Modification Method influences the photocatalytic activity and mechanism in a way different from others and the observed Modification effects are often different depending on the test substrates and conditions even for the same Modification Method. Better understanding of the Modification effects on TiO2 photocatalysis is necessary to obtain reliable results, to assess the photoconversion efficiency more quantitatively, and to further improve the Modification Methods.
Kazunari Domen - One of the best experts on this subject based on the ideXlab platform.
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fabrication of a core shell type photocatalyst via photodeposition of group iv and v transition metal oxyhydroxides an effective surface Modification Method for overall water splitting
Journal of the American Chemical Society, 2015Co-Authors: Tsuyoshi Takata, Chengsi Pan, Mamiko Nakabayashi, Naoya Shibata, Kazunari DomenAbstract:The design of optimal surface structures for photocatalysts is a key to efficient overall water splitting into H2 and O2. A unique surface Modification Method was devised for a photocatalyst to effectively promote overall water splitting. Photodeposition of amorphous oxyhydroxides of group IV and V transition metals (Ti, Nb, Ta) over a semiconductor photocatalyst from corresponding water-soluble metal peroxide complexes was examined. In this Method, amorphous oxyhydroxide covered the whole surface of the photocatalyst particles, creating a core–shell structure. The water splitting behavior of the novel core–shell-type photocatalyst in relation to the permeation behavior of the coating layer was investigated in detail. Overall water splitting proceeded successfully after the photodeposition, owing to the prevention of the reverse reaction. The photodeposited oxyhydroxide layers were found to function as molecular sieves, selectively filtering reactant and product molecules. By exploiting the selective perm...
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surface Modification of taon with monoclinic zro2 to produce a composite photocatalyst with enhanced hydrogen evolution activity under visible light
Bulletin of the Chemical Society of Japan, 2008Co-Authors: Kazuhiko Maeda, Hiroaki Terashima, Kentaro Kase, Masanobu Higashi, Masashi Tabata, Kazunari DomenAbstract:A composite material consisting of tantalum oxynitride (TaON) and monoclinic zirconium oxide (m-ZrO2) is prepared by a surface Modification Method as a photocatalyst with enhanced activity for H2 e...
Jimin He - One of the best experts on this subject based on the ideXlab platform.
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effects of formulations and processing parameters on foam morphologies in the direct extrusion foaming of polypropylene using a single screw extruder
Journal of Cellular Plastics, 2005Co-Authors: Zhijuan Xu, Jimin HeAbstract:The direct extrusion foaming process of low-density polypropylene (PP) in a typical single-screw extruder is researched. Effects of five variables on the volume expansion behavior and cellular morphologies are investigated. They are three kinds of polypropylene with different melt flow rates (MFRs), two kinds of chemical blowing agents, cross-linking Modification Method and blending Modification Method, two operating parameters (the screw speed and the die temperature), and die shapes. The experimental results prove that: the lower the MFR (from 0.45 to 10 g/10 min), the better the PP foamed; use of azodicarbonamide as the blowing agent helps to achieve PP foam with larger volume expansion, while use of endothermic foaming agent EPIcor 882 results in rigid foams with lower foaming ratios; melt strength can be effectively promoted, and low-density PP foam can be produced by proper addition of cross-linking agents or blending agents properly; low die temperatures (about 155 C) and high screw speeds (from 16...
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effects of formulations and processing parameters on foam morphologies in the direct extrusion foaming of polypropylene using a single screw extruder
Journal of Cellular Plastics, 2005Co-Authors: Zhijuan Xu, Jimin HeAbstract:The direct extrusion foaming process of low-density polypropylene (PP) in a typical single-screw extruder is researched. Effects of five variables on the volume expansion behavior and cellular morphologies are investigated. They are three kinds of polypropylene with different melt flow rates (MFRs), two kinds of chemical blowing agents, cross-linking Modification Method and blending Modification Method, two operating parameters (the screw speed and the die temperature), and die shapes. The experimental results prove that: the lower the MFR (from 0.45 to 10 g/10 min), the better the PP foamed; use of azodicarbonamide as the blowing agent helps to achieve PP foam with larger volume expansion, while use of endothermic foaming agent EPIcor 882 results in rigid foams with lower foaming ratios; melt strength can be effectively promoted, and low-density PP foam can be produced by proper addition of cross-linking agents or blending agents properly; low die temperatures (about 155 C) and high screw speeds (from 16...