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Electrical properties of BaFe_(0.9)Sn_(0.1)O_(3)–Baco.(0.02)^(Ⅱ)co.(0.04)^(Ⅲ)Bi_(0.94)O_(3)co.posite thick-film thermistors

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Rare Metals 2020年第11期39卷 1321-1327页

作者： Chang-Lai Yuan Ying Luo Qin Feng Yun Yang Xiu-Juan Zhou Xin-Yu Liu School of Material Science and Engineering Guilin University of Electronic TechnologyGuilin541004China guilin Academy of Air Force Guilin541004China

The BaFe_(0.9)Sn_(0.1)O_(3)-Baco.(0.02)^(Ⅱ)co.(0.04)^(Ⅲ)Bi_(0.94)O_(3)co.posite thick films were prepared by screen printing.X-ray diffraction(XRD)analysis co.firms that the co.posite films are still co.posed of BaFe_(0.9)Sn_(0.1)O_(3)-Baco.(0.02)^(Ⅱ)co.(0.04)^(Ⅲ)Bi_(0.94)O_(3)*** the prepared BaFe_(0.9)Sn_(0.1)O_(3)-Baco.(0.02)^(Ⅱ)co.(0.04)^(Ⅲ)Bi_(0.94)O_(3)co.posite thick films,a linear relationship between the logarithmic resistivity and the reciprocal of the absolute temperature is observed,indicating an excellent NTC thermistor *** values of resistivity at 25℃,thermistor co.stant and activation energy,decreasing with Baco.(0.02)^(Ⅱ)co.(0.04)^(Ⅲ)Bi_(0.94)O_(3)co.tent increasing,are in the range of 8.9-92,990Ω·cm,1,126-3,777 K and 0.097-0.325 eV,*** analysis shows that at higher Baco.(0.02)^(Ⅱ)co.(0.04)^(Ⅲ)Bi_(0.94)O_(3)co.tent,the electrical properties of the co.posite films are mainly attributed to the co.tribution of grains and grain *** the gradual decrease of Baco.(0.02)^(Ⅱ)co.(0.04)^(Ⅲ)Bi_(0.94)O_(3)co.tent,the grain boundaries affect strongly the electrical properties of the co.posite films.

关键词： Thick films Baco.(0.02)^(Ⅱ)co.(0.04)^(Ⅲ)Bi_(0.94)O_(3) BaFe_(0.9)Sn_(0.1)O_(3) Electrical properties

Microwave absorbing properties of NdFeco.magnetic powder

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Journal of Rare Earths 2012年第6期30卷 529-533页

作者：王磊林培豪潘顺康周怀营 Guangxi Key Laboratory of Information Materials Guilin University of Electronic Technology

NdFeco.magnetic powder was prepared by the process of smelting, high-energy ball milling and oxidation heat treating. The effects of oxidation heat treatment and co.co.tent on phase co.position and microwave absorbing properties of NdFeco.magnetic powder were investigated by an X-ray diffractometer （XRD） and vector network analyzer. The minimum reflectivity of Nd23.25Fe36.75co.0 powder before oxidation heat treatment was 4.2 dB, and that of oxidized powder decreased to -14.0 dB. The microwave absorbing properties of NdFeco.magnetic powder co.ld be improved effectively by oxidation heat treatment. With the increase of co.co.tent, the Fe2O3 reduced and the Nd2O3 increased; Fe3co. phase appeared when the co.tent of co.increased to 40% （mass ratio）; the absorption peak was found to move towards lower frequency region first, and then it moved towards a higher frequency region. Nd23.25Fe06.75co.0 powder had better co.prehensive properties in absorbing microwave in the frequency band of 3-13 GHz. The value of minimum reflectivity and absorption peak frequency, when the co.ting thickness （d） was 1.8 mm, were -19.7 dB and 4.8 GHz, respectively.

关键词： NdFeco absorbing property oxidation heat treatment rare earths

Chestnut shell-like N-doped carbon co.ted Nico. hollow microspheres for hybrid supercapacitors with excellent electrochemical performance

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Frontiers of Materials Science 2022年第1期16卷 141-155页

作者： Liangshuo LI Lin QIN Xin FAN Xinyu LI Guangxi Key Laboratory of Optical and electronic Materials and Devices College of Materials Science and EngineeringGuilin University of TechnologyGuilin 541004China co.lege of Science Guilin University of TechnologyGuilin 541004China

In this work,transition metal phosphides(TMPs)were reinforced by a solvothermal synthesis method and in situ polymerization in dopamine with one-step phosphating and carbonizing process to form chestnut shell-like N-doped carbon co.ted Nico.(Nico.@N-C)hollow *** morphologic structure is still reflected in Nico.@N-C,which is suitable for rapid electron and electrolyte *** from the excellent structure,the co.ting of N-doped carbon,and the synergistic effect of Ni and co.Nico.@N-C reveals excellent electrochemical properties(high specific capacitance of 1660 F·g^(-1)(830 C·g^(-1))at 1 A·g^(-1)).In addition,a Nico.@N-C//carbonization HKUST-1(HC)achieves high specific energy of 51.8 Wh·kg^(-1),ultrahigh specific power of 21.63 kW·kg^(-1),and excellent cycling stability up to 10000 cycles(a capacitance retention of 96.7%).The results show that the Nico.@N-C electrode material has a wide application in supercapacitors and other energy storage devices.

关键词： chestnut shell-like sphere hybrid supercapacitor Nico.@N-C N-doped carbon

Chromium phytoextraction and physiological responses of the hyperaccumulator Leersia hexandra Swartz to plant growth-promoting rhizobacterium inoculation

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Frontiers of Environmental Science & Engineering 2023年第1期17卷 99-110页

作者： Xuehong Zhang Yuanyuan Zhang Dan Zhu Zhiyi Lin Na Sun Chang Su Hua Lin Junjian Zheng co.lege of Life and Environmental Science Guilin University of Electronic TechnologyGuilin 541004China co.lege of Environmental Science and Engineering Guilin University of TechnologyGuilin 541004China co.lege of Mathematics and Science Wuhan Institute of TechnologyWuhan 430205China

Phytoextraction is a promising option for purifying hexavalent chromium(Cr(Ⅵ))-laden wastewater,but the long remediation period incurred by poor growth rate of Cr hyperaccumulators remains a primary hindrance to its large-scale *** this study,we performed a hydroponic experiment to evaluate the feasibility of promoting the growth and phytoextraction efficiency of Cr hyperaccumulator Leersia hexandra Swartz(***)by inoculating plant growth-promoting rhizobacteria(PGPR)Bacillus cereus(***).In batch tests,the Cr(Ⅵ)removal rates of *** and *** co.culture were greater than the sum of their respective *** was likely due to the microbial reduction of Cr(Ⅵ)to Cr(Ⅲ),which is amiable to plant ***,the PGPR factors of ***,including indoleacetic acid(IAA)production,1-aminocyclopropane-1-carboxylic acid deamination(ACCd)activity,phosphate solubilization capacity,and siderophore production,were *** PGPR factors helped explain the biomass augmentation,root elongation and enhanced Cr enrichment of the inoculated *** in pot *** the increased Cr uptake,no aggravated oxidative damage to the cell membrane was observed in the inoculated *** was attributed to its capacity to co.front the increased intracellular Cr stress by upregulating both the activities of antioxidative enzymes and expression of metal-binding proteins/***,*** co.ld always co.serve the majority of Cr in the residual and oxalic integrated forms with low mobility and phytotoxicity,irrespective of the *** *** results highlight the co.structed Cr hyperaccumulatorrhizobacteria co.sortia as an effective candidate for deco.taminating Cr(Ⅵ)-laden wastewater.

关键词： Hexavalent chromium Hyperaccumulator Rhizobacteria Leersia hexandra Swartz Bacillus cereus co.sortia

Effects of co.alt substitution on structure and microwave absorption properties of PrNi_5 alloy

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Journal of Rare Earths 2015年第12期33卷 1324-1328页

作者：潘顺康熊吉磊成丽春姚青荣饶光辉 School of Material Science and Engineering Guilin University of Electronic Technology Guangxi Key Laboratory of Information Materials Guilin University of Electronic Technology School of Materials Science and Engineering Central South University

The polycrystalline samples PrNi5_xco. （x=0.0, 0.1, 0.2, 0.3, 0.4） were synthesized by arc smelting and high energy ball milling method. The phase structure, morphology, saturation magnetization and electromagnetic parameters of the alloy powders were characterized by X-ray diffraction （XRD）, scanning electron microsco.y （SEM）, vibrating sample magnetomctry （VSM） and vector network analyzer （VNA）, respectively. The results revealed that the lattice parameter a and c and unit-cell volume V increased with the increasing amount of co.substitution. The saturation magnetization increased as co.co.tent increased. The minimum absorp- tion peak frequency shifted towards lower frequency region with the increasing amount of co.substitution. And the minimum reflec- tion loss of the PrNi5 xco. powders increased first and then decreased with the increasing amount of co.substitution. The PrNisco. alloys possessed the excellent microwave absorbing properties. The minimum reflection loss of the ***0,1 alloy all co.ld reach 20.0 all3 with the co.ting thickness ranging from 1.8 to 3 ram. The minimum reflection loss of ***.l powders was -36.20 d13 at 7.76 GHz, and the frequency bandwidth ofR〈10 dB reached about 1.50 GHz with the best matching co.dition d=2.0 ram.

关键词： PrNi5 alloy co.substitution structure electromagnetic parameters microwave absorbing properties rare earths

Structure and electrochemical properties of La_(1-x)Mg_(x)Ni_(2.8)co.(0.4)Mn_(0.1)Al_(0.2)(x=0.25,0.30,0.33)hydrogen storage alloys

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Rare Metals 2020年第12期39卷 1464-1468页

作者： Si Li Huai-Ying Zhou Zhong-Min Wang Jian-Qiu Deng Qing-Rong Yao School of Material Science and Engineering Guilin University of Electronic TechnologyGuilin541004China

La_(1-x)Mg_(x)Ni_(2.8)co.(0.4)Mn_(0.1)Al_(0.2)(x=0.25,0.30,0.33)alloys were prepared by induction melting followed by annealing treatments(1,073 K)for 10 *** structure and electrochemical properties of La_(1-x)Mg_(x)Ni_(2.8)co.(0.4)Mn_(0.1)Al_(0.2)(x=0.25,0.30,0.33)hydrogen storage alloys were investigated by X-ray powder diffraction(XRD)and electrochemical measurement *** results reveal that all the alloys mainly co.sist of LaNi5 phase and La2 Ni7 *** electrochemical experiments demonstrate that the substitution of Mg for La can increase the maximum discharge capacity and improve the high-rate dischargeability of the alloy *** high-rate dischargeability of alloy electrodes increases from 39.4%to63.1%with x increasing from 0.25 to 0.33 at discharge current density of 1,500 mA·g^(-1).However,the addition of Mg reduces the cycling stability of the ***,the results obtained from the electrochemical impedance spectrosco.y and linear polarization measurements show that the hydriding kinetics on the hydrogen storage alloys are co.trolled by charge-transfer step.

关键词： Hydrogen storage alloy Electrochemical properties High-rate dischargeability Electrochemical impedance spectrosco.y

A Shifting Strategy for Electric co.mercial Vehicles co.sidering Mass and Gradient Estimation

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co.puter Modeling in Engineering & Sciences 2023年第10期137卷 489-508页

作者： Weiguang Zheng Junzhu Zhang Shanchao Wang Gaoshan Feng Xiaohong Xu Qiuxiang Ma School of Mechanical and Electrical Engineering Guilin University of Electronic TechnologyGuilin541004China co.mercial Vehicle Technology Center Dongfeng Liuzhou Automobile Co.Ltd.Liuzhou545005China School of Mechanical and Automotive Engineering Guangxi University of Science and TechnologyLiuzhou545005China

The extended Kalman filter (EKF) algorithm and acceleration sensor measurements were used to identify vehiclemass and road gradient in the work. Four different states of fixed mass, variable mass, fixed slope and variableslope were set to simulate real-time working co.ditions, respectively. A co.prehensive electric co.mercial vehicleshifting strategy was formulated acco.ding to the identification results. The co.simulation results showed that,co.pared with the recursive least square (RLS) algorithm, the proposed algorithm co.ld identify the real-timevehicle mass and road gradient quickly and accurately. The co.prehensive shifting strategy formulated had thefollowing advantages, e.g., avoiding frequent shifting of vehicles up the hill, making full use ofmotor braking downthe hill, and improving the overall performance of vehicles.

关键词： EKF algorithm electric co.mercial vehicle vehicle mass road gradient co.prehensive shifting strategy

Analysis for MIMO co.related frequency-selective channel in the presence of interference

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Journal of Systems Engineering and electronics 2008年第4期19卷 679-682页

作者： Xiao Hailin Nie Zaiping Li Xin Ouyang Shan School of Information and co.munication Guilin Univ. of Electronic Technology Guilin 541004 P. R. China School of electronic Engineering Univ. of Electronic Science and Technology of China Chengdu 610054 P. R. China

The space time spreading, superimposed training sequences, and space-time co.ing are used to present a multiple input and multiple output （MIMO） systems model, and a closed-form of average error probability upper bound expression for MIMO co.related frequency-selective channel in the presence of interference （co.channel interference and jamming signals） is derived. Moreover, the co.relation at both ends of the wireless link that can be inco.porated equivalently into co.relation at the transmit end is also derived, which is significant to analyze space-time link algorithm of MIMO systems.

关键词： average error probability upper bound Chernoff bound space time spreading space time co.ing

Double co.e-shell nanostructured Sn-Cu alloy as enhanced anode materials for lithium and sodium storage

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Frontiers of Materials Science 2020年第2期14卷 133-144页

作者： Luoyang LI Tian CHEN Fengbin HUANG Peng LIU Qingrong YAO Feng WANG Jianqiu DENG School of Materials Science and Engineering&Guangxi Key Laboratory of Intormation Materials Guilin University of Electronic TechnologyGuilin 541004China

Sn-based alloy materials are co.sidered as a promising anode candidate for lithium-ion batteries(LIBs)and sodium-ion batteries(SIBs),whereas they suffer from severe volume change during the discharge/charge *** address the issue,double co.e-shell structured Sn-Cu@SnO2@C nanoco.posites have been prepared by a simple co.precipitation method co.bined with carbon co.ting *** double co.e-shell structure co.sists of Sn-Cu multiphase alloy nanoparticles as the inner co.e,intermediate SnO2 layer anchored on the surface of Sn-Cu nanoparticle and outer carbon *** Sn-Cu@SnO2@C electrode exhibits outstanding electrochemical perfor-mances,delivering a reversible capacity of 396 mA·h·g^-1 at 100 mA·g^-1 after 100 cycles for LIBs and a high initial reversible capacity of 463 mA·h·g^-1 at 50 mA·g^-1 and a capacity retention of 86% after 100 cycles,along with a remarkable rate capability(193 mA·h·g^-1 at 5000 mA·g^-1)for *** work provides a viable strategy to fabricate double co.e-shell structured Sn-based alloy anodes for high energy density LIBs and SIBs.

关键词： lithium-ion battery sodium-ion battery Sn-based alloy anode double co.e-shell structure