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Treatment of Invasive Marine Species on Board by Using Micro-gap Discharge Plasma 被引量:6
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作者 张芝涛 白敏冬 +2 位作者 杨波 白敏菂 白希尧 《Plasma Science and Technology》 SCIE EI CAS CSCD 2005年第5期3025-3029,共5页
A pilot-scale experiment of 20t/h for the treatment of ship's ballast water is reported in this paper. When the concentration of the dissolved OH. was 0.68 mg/L during the experiment, the rate of destroying bacteria,... A pilot-scale experiment of 20t/h for the treatment of ship's ballast water is reported in this paper. When the concentration of the dissolved OH. was 0.68 mg/L during the experiment, the rate of destroying bacteria, mono-algae, protozoan reached 100% within 2.67 s. The effect of hydroxyl radicals on biochemical processes was also studied. The attenuation rate of photosynthesis pigment was 100%. And the main reason for the cells' death was the strong destruction of the monose, amylose, protein, DNA and RNA in the cells. As an advanced oxidation method, the procedure can destroy invasive marine species when a ship is in the process of discharging its ballast water. 展开更多
关键词 invasive marine species micro-gap discharge plasma photosynthesis pigment basic life substance
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Effects of Hydroxyl Radicals on Introduced Organisms of Ship's Ballast Water Based Micro-Gap Discharge 被引量:2
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作者 白敏冬 张芝涛 +2 位作者 白敏菂 杨波 白希尧 《Plasma Science and Technology》 SCIE EI CAS CSCD 2007年第2期206-210,共5页
With the physical method of micro-gap gas discharge, OH. radicals were produced by the ionization of O2 in air and H2O in the gaseous state, in order to explore more effective method totreat the ship's ballast water.... With the physical method of micro-gap gas discharge, OH. radicals were produced by the ionization of O2 in air and H2O in the gaseous state, in order to explore more effective method totreat the ship's ballast water. The surface morphology of Al2O3 dielectric layer was analysed using Atomic Force Microscopy (AFM), where the size of Al2O3 particles was in the range of 2 μm to 5 μm. At the same time, the biochemical effect of hydroxyl radicals on the introduced organisms and the quality of ship's ballast water were studied. The results indicate that the main reasons of cell death are lipid peroxide and damage of the antioxidant enzyme system in Catalase (CAT), Peroxidase (POD) and Superoxide dismutase (SOD). In addition, the quality of the ballast water was greatly improved. 展开更多
关键词 micro-gap discharge α-Al2O3 dielectric layers introduced organisms hydroxyl radical biochemistry effect
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Measurements of Characteristics of Electromagnetic Radiation Caused by Electrostatic Discharges in Metal Sphere Gap at Voltages Less than 1 kV 被引量:1
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作者 Ken Kawamata Shigeki Minegishi 《China Communications》 SCIE CSCD 2013年第7期29-35,共7页
In this study,the characteristics of Electromagnetic(EM) radiation caused by Electrostatic Discharges(ESDs) from metal spheres charged to voltages less than 1 kV are examined experimentally.Our experimental system con... In this study,the characteristics of Electromagnetic(EM) radiation caused by Electrostatic Discharges(ESDs) from metal spheres charged to voltages less than 1 kV are examined experimentally.Our experimental system consists of a pair of spherical electrodes of different diameters,a 1-18 GHz-bandwidth horn antenna and a 20-GHz-bandwidth digitizing oscilloscope.Polarization,waveform duration and peaks of antenna-received voltages from the EM field radiation are measured in order to clarify the EM radiation mechanism.The ratio of the received voltages between the antenna arrangements of the field polarization parallel and perpendicular to the spark pass is 18 to 20 dB.The polarities of the antenna-received voltages are the same as those of the charge voltages across the gap.Moreover,the waveform duration and the first peaks increase with an increase in the diameters of the spherical electrodes.Consequently,we find that the polarization,waveform duration and first peaks of the EM field radiation can be explained by a dipole antenna structure,which makes the spark part of the spherical electrodes a feeding point on the straight line passing through the centres of the two spheres. 展开更多
关键词 ESD micro-gap discharge electromagnetic radiation polarization spherical electrode waveform duration
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Thermal Contact Resistance between Aero Engine Compressor Blade and Flexible Fixture 被引量:1
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作者 DAI Shijie WANG Dong +2 位作者 ZHANG Huibo LI Shibo WANG Zhiping 《Journal of Thermal Science》 SCIE EI CAS CSCD 2021年第2期530-539,共10页
In the process of two-pass micro plasma arc welding of titanium alloy sheet,based on the thermal contact resistance theory,a three-dimensional transient heat transfer finite element model of contact heat transfer betw... In the process of two-pass micro plasma arc welding of titanium alloy sheet,based on the thermal contact resistance theory,a three-dimensional transient heat transfer finite element model of contact heat transfer between titanium alloy sheet and flexible fixture was established.The effects of contact upper surface temperature,micro-contact thermal resistance,micro-gap thermal resistance,DC and pulse welding on thermal contact resistance were investigated,and the simulation and experimental results were compared.The results show that the thermal contact resistance increases as the temperature increases when the temperature of the contact upper surface (titanium alloy sheet) is in the range of 290-350 K.The effect of micro-contact thermal resistance on the thermal contact resistance is 26.1%-46.3% larger than the micro-gap thermal resistance.The thermal contact resistance of pulse welding is 3.1%-3.5% larger than DC welding.The error of simulation and experimental results of weld pool depth is 8.6%,which verifies the reliability of the model. 展开更多
关键词 titanium alloy micro plasma arc welding thermal contact resistance micro-contact thermal resistance micro-gap thermal resistance finite element model
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