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Influence of electrical parameters on H2O2 generation in DBD non-thermal reactor with water mist

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Plasma Science and Technology 2017年第6期19卷 26-32页

作者：徐迪肖泽铧郝春静邱剑刘克富 Institute of Light Sources and Illuminating Engineering Fudan University Shanghai 200433 People's Republic of China

A dielectric barrier discharge（DBD） reactor is introduced to generate H2O2 by non-thermal plasma with a mixture of oxygen and water mist produced by an ultrasonic *** results of our experiment show that the energy yield and concentration of the generated H2O2 in the pulsed discharge are much higher than that in AC discharge,due to its high energy efficiency and low heating ***-sized liquid droplets produced by an ultrasonic atomizer in water mist have large specific surface area,which greatly reduces mass transfer resistance between hydroxyl radicals and water liquids,leading to higher energy yield and H2O2 concentration than in our previous *** influence of applied voltage,discharge frequency,and environmental temperature on the generated H2O2 is discussed in detail from the viewpoint of the DBD *** H2O2 concentration of 30 mg l^-1,with the energy yield of 2 gkW^-1h^-1 is obtained by pulsed discharge in our research.

关键词： hydrogen peroxide dielectric barrier discharge pulsed discharge non-thermal plasma electrical parameters

The electrical parameters Modeling and Experimentation of Copper Vapor Laser

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Circuits and Systems 2016年第1期7卷 23-28页

作者： Fatemeh Rafighi Saeed Behrouzinia Kamran Khorasani Masoud Sabaghi Saeid Marjani Central Tehran Department of Physics Islamic Azad University Tehran Iran Laser and Optics Research School Nuclear Science and Technology Research School Atomic Energy Organization of Iran Tehran Iran Department of electrical Engineering Ferdowsi University of Mashhad Mashhad Iran

In this paper, the present developments of copper vapor laser technology were computational modeling and simulations methods. In most of the cases, before the experiment, the functions of electrical parameters can be predicted by the use of physical simulation codes. A single simulation model describing the discharge circuitry was introduced. By solving the equations of circuit via Runge-Kutta method, the current and voltage pulses of the discharge tube were investigated, which are in good agreement with the experimental results of the same laser.

关键词： Copper Vapor Laser electrical parameters Simulation Method

Effects of the Shading Rate on the electrical parameters of CIGS-Based Solar Modules

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Energy and Power Engineering 2021年第12期13卷 483-491页

作者： El Hadji Abdoulaye Niass Papa Touty Traore Awa Dieye Oumar Absatou Niasse Pierre Tavarez Nacire Mbengue Zakaria Makir Zouhair Sofiani Bassirou Ba Physics Department Faculty of Science and Technology University Cheikh Anta Diop Dakar Senegal Physics Department Faculty of Science and Technology of Mohmammadia Laboratory Laboratory of Materials and Energy and System Control University Hassan II Casablanca Marocco

The aim of this article is to study the effects of the shading rate on the electrical performance parameters of CIGS PV modules. The study concerns a new flexible CIGS type photovoltaic module with a power of 90 W, manufactured by the company Shenzhen Shine Solar Co., Ltd. This module, reference SN-CIGS90, is tested under the initial conditions to ensure its correct operation and to determine the initial values of the electrical parameters before shading. After this characterization test, the module is exposed under the actual operating conditions of the Renewable Energies Study and Research Center (CERER), located in Dakar, then 4 types of shading are performed with the same mask: partial shading 25% partial shading, 50% partial shading, 75% partial shading, and 100% full shading. The variation rates obtained on the experimental values of the 4 types of shading carried out determine that the shading phenomenon constitutes a factor that influences negatively on the electrical parameters of a CIGS-based PV module. Indeed, for 25% of the surface of the shaded module, there is a reduction of 58.139% of the maximum power and of 60.507% of the efficiency and for shading of 100%, the module loses 84.436% of its maximum power and 84.135% of its performance.

关键词： Modulus Shading Rate electrical parameters Mask

Effect of system parameters on the size distributions of hollow nickel microspheres produced by an ultrasound-aided electrical discharge machining process

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Particuology 2014年第6期12卷 36-41页

作者： Yifan Liu Xianglong Li Fushi Bai Jian Chen Yantao Wang Nan Liu School of Manufacturing Science and Engineering Sichuan University School of Mechanical and Manufacturing Engineering University of New South Wales

Ultrasound-aided electric discharge machining（EDM） is an emerging technology for producing hollow nickel *** technology combines traditional EDM with the cavitation and vibration effects of ultrasound to produce hollow *** this paper,ultrasound-aided EDM was carried out in a kerosene medium（the working solution）.The effects of various parameters on the sizes of microspheres were investigated using scanning electronic microscopy（SEM）.Smileview software was used to measure the sizes of the *** software was used for statistical analysis to determine the size distributions of the *** study the effects of the system parameters on the sizes of the microspheres,we first investigated the necessity of using an ultrasonic wave with *** comparing the experimental results with and without the ultrasonic field,we found that ultrasound-induced cavitation and vibration effects reduced the diameters of the *** then studied the effects of several electrical parameters,including the arc current,pulse width,and gap voltage,on the sizes of the microspheres at an ultrasound frequency of 40 *** microspheres could be obtained by lowering the arc current,pulse width,and gap voltage.

关键词： Hollow microspheres Ultrasonic-aided EDM Cavitation electrical parameters Size distribution

Effects of electric parameters on microstructure and properties of MAO coating fabricated on ZK60 Mg alloy in dual electrolyte

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Rare Metals 2012年第2期31卷 172-177页

作者： Chen, Jing Wang, Zexin Lu, Sheng School of Materials Science and Engineering Jiangsu University of Science and Technology Zhenjiang 212003 China School of Mechanical Engineering Jiangsu University of Science and Technology Zhenjiang 212003 China

Micro-arc oxidation (MAO) process was carried out in a dual electrolyte system of NaAlO2 and Na3PO4 on ZK60 Mg alloys to explore the effect of electric parameters including current density, frequency, duty cycle and oxidation time on the evolution of coatings and other characteristics. The microstructural characteristics of coatings were observed by scanning electron microscopy (SEM) combined with the analysis of voltage-time responses during MAO process. Test of weight loss was conducted at a 3.5% NaCl solution to assess the resistance to corrosion. The results indicate that the current density and duty cycle play key roles on the coating quality. The peak voltage during MAO process increased with the increase in current density but the coating would be more easily detached when the current density was beyond a critical value. Voltage during MAO and microstructure of the coating were affected remarkably by duty cycle, and corrosion resistance was improved greatly when duty cycle was 40%. By means of single variable experiments, MAO process with optimized electric parameters was developed, which corresponds to the current density of 20 A·dm−2, frequency of 500 Hz, duty cycle of 40% and oxidation time of 15 min.

关键词： magnesium alloys micro-arc oxidation electrical parameters microstructure performance

High Performance for Cu(In,Ga)Se₂ Quaternary System-Based Solar Cells with Alternative Buffer Layers

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Advances in Materials Physics and Chemistry 2022年第9期12卷 207-219页

作者： Daouda Oubda Marcel Bawindsom Kébré Soumaïla Ouédraogo Alain Diasso François Zougmoré Zacharie Koalga Frédéric Ouattara Laboratoire de Matériaux et Environnement (LA.M.E)-UFR/SEA Université Joseph KI-ZERBO Ouagadougou Burkina Faso Laboratoire de Recherche en Energétique et Météorologie de l’Espace (LA.R.E.M.E) Université Norbert Zongo Koudougou Burkina Faso

In this study, the authors investigated the performance of different buffer layers through the electrical parameters such as Jsc, Voc, QE and η of the quaternary system Cu(In,Ga)Se2 solar cells. The performance of Cu(In,Ga)Se2solar cells has been modeled and numerically simulated by using the SCAPS- 1D device simulation tool. The cells with a ZnSe, Zn(O,S) and (Zn,Mg)O buffer layers were compared with the reference CdS buffer layer. The investigation of ZnSe, Zn(O, S) and (Zn,Mg)O-based cells to substitute the traditional CdS in the future shows that the ZnSe-buffer layer is a potential material to replace CdS, which revealed the best efficiency of 20.76%, the other electrical parameters are: JSC = 34.6 mA/cm2, VOC = 0.76 V and FF = 79.6%. The losses as a function of the temperature are estimated at 0.1%/K, among all kinds of buffer layers studied. We have also shown that the use of a high band-gap buffer layer is necessary to obtain a better short-circuit current density JSC. From our results, we note that the chalcogenide solar cells with Zn-based alternative buffer layer have almost the same stability thatthe traditional CdS buffer layer solar cells have.

关键词： Thin Film Solar Cells CIGS Absorber Alternative Buffer Layers SCAPS-1D electrical parameters

Microstructure and Properties of MAO Coatings for AZ91D Magnesium Alloy in Varies Work Mode

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Microstructure and Properties of MAO Coatings for AZ91D Magn...

The calculation of resistance of quartz crystal resonators with consideration of electrode viscosity

中国材料大会2012

作者： Xuejun Cui Xiuzhou Lin Chunhai Liu Ruisong Yang Mingtian Li Material Corrosion and Protection Key Laboratory of Sichuan Province Sichuan University of Science and Engineering College of Materials and Chemical Engineering Sichuan University of Science and Engineering

ISBN: (纸本)9783037856086;3037856084

Micro arc oxidation coatings were prepared on AZ91D magnesium alloy in order to evaluate the role of electrical parameters under different work mode. Taking HV hardness and pit corrosion time as investigation index, the optimum process parameters were obtained through orthogonal experiment method. The morphology of coating was observed by scanning electron microscopy （SEM）. The results showed that the coatings with dense and few micro pores can be obtained under constant current and power mode, and this kind coatings are of good corrosion resistance and have HV micro-hardness compared with those under constant voltage mode.

关键词： Magnesium alloy Micro arc oxidation Work mode electrical parameters

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The calculation of resistance of quartz crystal resonators w...