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1. Development and Testing of Wavelet Modulation for Three-Phase Three-level Inverter | |||
LIU Hongchen,SHEN Zhifang,SUN Lishan | |||
Dynamic and Electronic Engineering 21 April 2017 | |||
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Abstract:This paper presents the development and implementation of a wavelet modulation (WM) technique for the three-phase three-level voltage source inverter. The WM technique is based on constructing a nondyadic-type multiresolution analysis (MRA), which supports sampling continuous time sinusoidal signals in a nonuniform recurrent manner, then reconstructing it using inverter switching actions. The simulated and experimental performances of the three-phase three-level inverter, which is realized by the WM technique, are investigated. To compare the performances of WM technique, those of PWM and SVPWM techniques are obtained. The results show that the high magnitude of fundamental components and significantly reduced harmonic contents of the inverter outputs can be achieved by using WM in the three-phase three-level inverters and it can be easily realized. | |||
TO cite this article:LIU Hongchen,SHEN Zhifang,SUN Lishan. Development and Testing of Wavelet Modulation for Three-Phase Three-level Inverter[OL].[21 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4727016 |
2. The development course of plasma water treatment technology | |||
LIU Kun,LIAO Hua,HU Youyi,LEI Juzhang | |||
Dynamic and Electronic Engineering 31 May 2016 | |||
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Abstract:In this paper, the plasma water treatment technology can degrade high concentrations of refractory organic wastewater efficiently, with the advantage of no additives, and no secondary pollution and it has become a research hotspot in recent years. According to the phase state participated by the mediators, the plasma water treatment technology can be divided into three categories: gas phase electrical discharge, liquid phase electrical discharge, and gas-liquid mixed phase electrical discharge water treatment. According to the above classification, not only the development course of the plasma water treatment technology has been deeply analyzed, but also the structure, the work principle and the treatment effect of several representative devices in latest researches has been introduced in this paper. Through the analysis of this article, it has been found that the most difficult problem for the plasma water treatment technology is how to promote its industrialization process, improving the amount of water treatment in specified unit of time, which will be a huge challenge for us. | |||
TO cite this article:LIU Kun,LIAO Hua,HU Youyi, et al. The development course of plasma water treatment technology[OL].[31 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4694021 |
3. Manipulate Interface Thermal Conductance of Metal-Graphene-Substrate Using Graphene Thermal Stability | |||
ZHAO Weiwei,ZHANG Chunwei,YONG Guoqing,HUANG Peng,BI Kedong,CHEN Yunfei,NI Zhenhua | |||
Dynamic and Electronic Engineering 05 January 2013 | |||
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Abstract:Graphene defects have played an important role in graphene's electrical, optical and thermal properties. In this work, we measured the interface thermal conductance of Al/graphene with different defect situations/silica using transient thermoreflectance technique. We use the graphene thermal stability of being annealed in different temperatures to manipulate the graphene defects. The transient thermoreflectance technique measurement results suggest that as graphene defects increase, the interface thermal conductance increases as well. The cause of the interface thermal conductance increase might be the graphene disintegration which starts from graphene imperfection rings and the oxygen doping which will enhance the metal-graphene bonding energy. | |||
TO cite this article:ZHAO Weiwei,ZHANG Chunwei,YONG Guoqing, et al. Manipulate Interface Thermal Conductance of Metal-Graphene-Substrate Using Graphene Thermal Stability[OL].[ 5 January 2013] http://en.paper.edu.cn/en_releasepaper/content/4512357 |
4. Flow Patterns of New Type Flame Stabilizer in P.F. Combustor | |||
ZHAO Lingling,ZHOU Qiangtai,ZHAO Changsui | |||
Dynamic and Electronic Engineering 04 January 2011 | |||
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Abstract:A new type of flame stabilizer called Petal Flame Stabilizer (PFS) is put forward for the P.F. swirl burner of power plant boiler to increase the flame stability. A three-dimensional (360 degree) mathematical model is set up to analyze the mechanisms of the flame ignition and to compare the performance of PFS with the common bluff-body stabilizer in the same conditions. The research results show that the flow pattern PFS formed consists of a radial and a pair of axial recirculation zones at the leeward of each petal of PFS besides the central recirculation zone (CRZ). The mass and heat transfer depends on not only the fluctuation of microscopic turbulence at the edge of the recirculation zone which are the main drive force in the conventional swirl burner, but also the great-intensity macroscopic convection transfer. This special flow pattern (multi- recirculation zone) of PFS provides steady heat source, and is propitious for the stable combustion of pulverized coal. | |||
TO cite this article:ZHAO Lingling,ZHOU Qiangtai,ZHAO Changsui. Flow Patterns of New Type Flame Stabilizer in P.F. Combustor[OL].[ 4 January 2011] http://en.paper.edu.cn/en_releasepaper/content/4403897 |
5. Extension of The Implicit Curve-Fitting Method for Fast Calculation of Thermodynamic Properties to Subcooled Refrigerant | |||
Guoliang Ding,Zhigang Wu,Weizhe Han,Kaijian Wang,Masaharu Fukaya | |||
Dynamic and Electronic Engineering 04 March 2008 | |||
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Abstract:Calculations of refrigerant thermal properties are desired to be very fast and stable in cases of simulation of refrigeration system, etc. The implicit regress and explicit calculation method is a quite good method for the fast and stable calculation of refrigerant thermodynamic properties, and it has been used for saturated, two-phase and superheated refrigerants. In this paper, the implicit regress and explicit calculation method is extended to the calculation of subcooled refrigerants. As an example, the fast calculation formulae for subcooled refrigerant R22, R134a, R410A and R407C are developed based on the source data derived from NIST REFPROP 7.1. The comparison shows that, for pure refrigerant, the total mean relative deviations of the fast calculation formulae are less than 0.02 % and the maximum relative deviations are less than 0.60%; for refrigerant mixtures, the total mean relative deviations of the fast calculation formulae are less than 0.08%. The maximum relative deviation of R410A is less than 3.36% while the maximum relative deviation of R407C is less than 0.87%. The mean calculation speed of the fast calculation formulae for thermal properties of pure refrigerant and that of refrigerant mixtures are near 100 times and more than 1500 times faster than those of NIST REFPROP 7.1, respectively. | |||
TO cite this article:Guoliang Ding,Zhigang Wu,Weizhe Han, et al. Extension of The Implicit Curve-Fitting Method for Fast Calculation of Thermodynamic Properties to Subcooled Refrigerant[OL].[ 4 March 2008] http://en.paper.edu.cn/en_releasepaper/content/18990 |
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