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宇航材料工艺 2024年第1期54卷 29-35页

作者：谭春林李宇东陈肯刘墨轩湖南航天磁电有限责任公司长沙410299

综述了镍锌铁氧体吸波材料的研究情况。从磁性能、配方对吸波性能的影响,以及与其他材料复合对吸波性能的影响等方面,对镍锌铁氧体吸波材料进行比较全面的总结,并与我司研究情况进行对比,希望对镍锌铁氧体吸波材料的开发与应用提供支持。

关键词：镍锌铁氧体吸波材料

Approximate graphical method of solving Fermi level and majority carrier density of semiconductors with multiple donors and multiple acceptors

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Journal of Semiconductors 2011年第6期32卷 1-6页

作者： ken K.Chin Department of Physics and Apollo CdTe Solar Energy Research Center New Jersey Institute of Technology

We present a generic approximate graphical method for determining the equilibrium Fermi level and majority carrier density of a semiconductor with multiple donors and multiple acceptors compensating each other. Simple and easy-to-follow procedures of the graphical method are *** graphically plotting two wrapping step functions facing each other,one for the positive hole-ionized donor and one for the negative electron-ionized acceptor,we have the crossing point that renders the Fermi level and majority carrier *** the graphical method,new equations are derived,such as the carrier compensation proportional to N;/N;,not the widely quoted N;-N;.Visual insight is offered to view not only the result of graphic determination of Fermi level and majority carrier density but also the dominant and critical pair of donors and acceptors in *** graphical method presented in this work will help to guide the design,adjustment,and improvement of the multiply doped *** of this approximate graphical method with previous work on compensation,and with some experimental results,is *** work in the field is proposed.

关键词： doping compensation Fermi level carrier density graphical method ionization

Local charge neutrality condition,Fermi level and majority carrier density of a semiconductor with multiple localized multi-level intrinsic/impurity defects

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Journal of Semiconductors 2011年第11期32卷 1-8页

作者： ken K.Chin Department of Physics and Apollo CdTe Solar Energy Research Center New Jersey Institute of Technology Department of Photonic and Information Engineering School of Electronic and Information EngineeringBeihang University

For semiconductors with localized intrinsic/impurity defects, intentionally doped or unintentionally incorporated, that have multiple transition energy levels among charge states, the general formulation of the local charge neutrality condition is given for the determination of the Fermi level and the majority carrier density. A graphical method is used to illustrate the solution of the problem. Relations among the transition energy levels of the multi-level defect are derived using the graphical method. Numerical examples are given for p-doping of the CdTe thin film used in solar panels and semi-insulating Si to illustrate the relevance and importance of the issues discussed in this work.

关键词： multi-level defects defect complex intrinsic impurity semiconductor Fermi level majority carrier density

Development of a battery-operated floating-electrode dielectric barrier discharge plasma device and its characteristics

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Plasma Science and Technology 2021年第6期23卷 67-73页

作者： yawei LIU Sen wang Rusen ZHOU Zhi FANG Kostya(ken)OSTRIKOV College of Electrical Engineering and Control Science Nanjing Technology UniversityNanjing 211816People's Republic of China School of Chemistry and Physics and QUT Centre for Materials Science Queensland University of Technology(QUT)BrisbaneQueensland 4000Australia

In this work,a portable floating-electrode dielectric barrier discharge(FE-DBD)device is designed with a rechargeable battery as the power *** characteristics of the FE-DBD with a metal electrode and human hand are studied and *** human contact safety is verified by calculating the current through the human body based on the equivalent circuit *** coli inactivation experiments confirm the efficacy of the FE-DBD device in the envisaged applications.

关键词： floating-electrode dielectric barrier discharge portable plasma source human contact safety bacterial inactivation

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宁夏枸杞新品种‘宁农杞15号’

园艺学报 2024年第S1期51卷 235-236页

作者：秦垦张波王丹青高燕戴国礼黄婷何昕孺周旋段淋渊焦恩宁宁夏农林科学院枸杞科学研究所银川750002

‘宁农杞15号’是以‘06-3-8’为母本与‘宁农杞1号’进行杂交选育的宁夏枸杞新品种。果实长椭圆形,深红色,果粒大。多糖含量46.45g·kg^(-1),平均单果质量0.82 g。2~5龄平均株产干果0.55 kg,较对照‘宁杞1号’高102%,5龄株产干果1.01 ... 详细信息

‘宁农杞15号’是以‘06-3-8’为母本与‘宁农杞1号’进行杂交选育的宁夏枸杞新品种。果实长椭圆形,深红色,果粒大。多糖含量46.45g·kg^(-1),平均单果质量0.82 g。2~5龄平均株产干果0.55 kg,较对照‘宁杞1号’高102%,5龄株产干果1.01 kg,比对照高98%。物候期较对照提前7~10 d,适宜以银川为代表的二季产区种植,作为锁鲜、制干、榨汁兼用品种推广使用。

关键词：宁夏枸杞杂交品种

Analysis of the stress wave and rarefaction wave produced by hypervelocity impact of sphere onto thin plate

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Defence Technology（防务技术） 2020年第5期16卷 969-979页

作者： ken Wen Xiao-wei Chen State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China Institute of Systems Engineering China Academy of Engineering PhysicsMianyangSichuan621999China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing100081China

Shock wave is emitted into the plate and sphere when a sphere hypervelocity impacts onto a thin *** fragmentation and phase change of the material caused by the propagation and unloading of shock wave could result in the formation of debris cloud *** models are deduced based on one-dimensional shock wave theory and the geometry of sphere,which uses elliptic equations(corresponding to ellipsoid equations in physical space)to describe the propagation of shock wave and the rarefaction ***“Effective thickness”is defined as the critical plate thickness that ensures the rarefaction wave overtake the shock wave at the back of the ***“Effective thickness”is directly related to the form of the debris *** relation of the“Effective thickness”and the“Optimum thickness”is also *** impacts of Al spheres onto Al plates are simulated within SPH to verify the propagation models and associated *** results show that the wave fronts predicted by the propagation models are closer to the simulation result at higher impact *** curvatures of the wave fronts decrease with the increase of impact *** predicted“Effective thickness”is consistent with the simulation *** analysis about the shock wave propagation and unloading in this paper can provide a new sight and inspiration for the quantitative study of hypervelocity impact and space debris protection.

关键词： Hypervelocity impact Debris cloud Shock wave Rarefaction wave Effective thickness of plate

The Structure and Mechanical Properties of Cr4Mo4V Steel Treated by PIII Carbonitriding

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稀有金属材料与工程 2012年第S1期41卷 176-179页

作者： ken yukimura Harbin Institute of Technology Harbin 150001China

The composition and structure of PIII(plasma immersion ion implantation)carbonitrided Cr4Mo4V steel were analyzed using X-ray photoelectron spectroscopy(XPS),X-ray diffraction(XRD),optical microscopy(OM)and *** results indicate that the nitride and carbide are dispersion phase precipitation and except formation of compound other implantation atoms dissolve into martensite *** total concentration of carbon and nitrogen is about 30 at%near the surface,and still keeps at about 20 at%even at the depth of 8μ*** effect of treatment temperature,implantation time and ratio of N2 to CH4 on the hardness and wear resistance of carbonitrided layer are *** is found that the hardness of Cr4Mo4V steel increases after *** highest hardness of samples is 22.3 GPa,which is about 1.8 times than initial *** dry-wear resistance of the samples is also improved after treatment,and the sample with higher hardness shows the better wear resistance.

关键词： Cr4Mo4V steel PBII carbonitriding hardness wear resistance

Emissivity of La_(1-x)Sr_xMnO_3/acrylic Resin Thermal Control Coating

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稀有金属材料与工程 2012年第S1期41卷 253-255页

作者： yukimura ken Harbin Institute of Technology Harbin 150001China

Thermal control coatings were fabricated by mixing of La1-xSrxMnO3(LSMO)powder and acrylic resin and brushed on Al alloy *** powders of La0.7Sr0.3MnO3 and La0.8Sr0.2MnO3 were prepared using sol-gel *** results reveal the phase structure of LSMO powders are *** transition temperature from metal to insulator of La0.7Sr0.3MnO3 and La0.8Sr0.2MnO3 are 300 and 275 K,*** emissivity evolution with temperature of the coatings was *** La0.7Sr0.3MnO3/acrylic resin coating,the emissivity increases from 0.56 to 0.88,and for La0.7Sr0.3MnO3/acrylic resin coating from 0.50 to 0.90.

关键词： thermal control coatings LSMO emissivity

ESTIMATION OF ROCK-AGGREGATE VOLUME BASED ON PCA AND LM-OPTIMIZED NEURAL NETWORK

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Journal of Electronics(China) 2009年第6期26卷 825-830页

作者： Zhao Pan Chen ken wang yicong Zhang yun College of Information Science and Engineering Ningbo University Ningbo 315211 China

In granule processing industries, acquisition of particle size and shape parameters is a common procedure, and volumetric measurement is of great importance in dealing with particle sizing and gradation. To eradicate the major drawbacks with manual gauge, this paper proposes an optical approach using Back Propagation （BP） neural network to estimate the particle volume based on the two-Dimensional （2D） image information. To achieve the better network efficiency and structure simplicity, Principal Component Analysis （PCA） is adopted to reduce the dimensions of network inputs To overcome the shortcomings of generic BP network for being slow to converge and vulnerable to being trapped in local minimum, Levenberg-Marquardt （LM） algorithm is applied to achieve a higher speed and a lower error rate. The real particle data is utilized in training and testing the presented network. The experimental result suggests that the proposed neural network is capable of estimating aggregate volume with satisfactory precision and superior to the generic BP network in terms of perforxnance capacity.

关键词： Particle image Particle parameters Principal Component Analysis (PCA) Neuralnetwork Volume estimation

Liquid discharge plasma for fast biomass liquefaction at mild conditions: The effects of homogeneous catalysts

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Frontiers of Chemical Science and Engineering 2020年第5期14卷 763-771页

作者： Sen wang Shiyun Liu Danhua Mei Rusen Zhou Congcong Jiang Xianhui Zhang Zhi Fang Kostya(ken)Ostrikov College of Electrical Engineering and Control Science Nanjing Tech UniversityNanjing 211816China Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance Institute of Electromagnetics and AcousticsDepartment of Electronic ScienceCollege of Electronic Science and TechnologyXiamen UniversityXiamen 361005China School of Chemistry Physics and Mechanical EngineeringQueensland University of TechnologyBrisbaneQueensland 4000Australia

Non-thermal plasma exhibits unique advan-tages in biomass conversion for the sustainable production of higher-value energy *** homogeneous catalysts are usually required for plasma-enabled biomass liquefaction to achieve time-and energy-efficient ***,the effects of such catalysts on the plasma-assisted liquefaction process and of the plasma on those catalysts have not been thoroughly *** this study,an electrical discharge plasma is employed to promote the direct liquefaction of sawdust in a mixture of polyethylene glycol 200 and *** commonly used chemicals,sulfuric acid,nitric acid and sodium p-toluene sulfate,were selected as *** effects of the type of catalyst and concentration on the liquefaction yield were examined;further,the roles of the catalysts in the plasma liquefaction process have been *** results showed that the liquefaction yield attains a value of 90%within 5 min when 1%sulfuric acid was employed as the *** with the other catalysts,sulfuric acid presents the highest efficiency for the liquefaction of *** was observed that hydrogen ions from the catalyst were primarily responsible for the significant thermal effects on the liquefaction system and the generation of large quantities of active species;these effects directly con-tributed to a higher efficacy of the plasma-enabled liquefaction process.

关键词： discharge plasma biomass liquefaction cata-lyst homogeneous catalysts