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Ultra-stable carbon-coated sodium vanadium phosphate as cathode material for sodium-ion battery

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Rare Metals 2022年第1期41卷 115-124页

作者： Di Wang Peng Cai Guo-Qiang Zou Hong-Shuai Hou xiao-bo ji Ye Tian Zhen Long Tianjin Key Laboratory of Functional Crystal Materials Institute of Functional CrystalTianjin University of TechnologyTianjin 300384China College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China

Based on the excellent sodium ion mobility of sodium superionic conductor structures,Na_(3)V_(2)(PO_(4))_(3)materials have become promising cathode materials in sodium-ion batteries(SIBs).However,inadequate electronic transport of Na_(3)V_(2)(PO_(4))_(3)limits the cycling stability and rate performances in *** this work,high-performance conductive carbon-coated Na_(3)V_(2)(PO_(4))_(3)materials are obtained via a simple and facile ball-milling assisted solid-state method by utilizing citric acid as carbon *** carbon-coated composite electrodes display a high initial specific capacity of 111.6 mAh·g^(-1),and the specific capacity could retention reach 92.83%after 100 cycles at 1C with the high coulombic efficiency(99.95%).More importantly,the capacity of conductive carbon-coated nano-sized Na_(3)V_(2)(PO_(4))_(3)can remain 48.5 mAh·g^(-1) at 10℃after 3000 cycles(initial capacity of 101.2 mAh·g^(-1)).At the same time,high coulombic efficiency(near 100%)has little decay even at a high rate of 20℃during 1000 cycles,demonstrating the excellent cycling stability and remarkable rate performances,and showing potential in largescale productions and applications.

关键词： Na_(3)V_(2)(PO_(4))_(3) Sodium superionic conductor structures Ball-milling Cathode Sodium-ion battery

Anisotropic Spin Cluster as a Qubit

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Communications in Theoretical Physics 2007年第7期48卷 90-92页

作者： YAN xiao-bo WANG Ming-ji Electronic Science Institute,Daqing Petroleum Institute,Daqing 163318,China Electronic Science Institute Daqing Petroleum Institute

We study an anisotropic spin cluster of 3 spin S=1/2 particles with antiferromagnetic exchange interactionwith non-uniform coupling constants.A time-dependent magnetic field is applied to control the time evolution of *** is well known that for an odd number of sites a spin cluster qubit can be defined in terms of the ground *** universal one-qubit logic gate can be constructed from the time evolution operator of the non-autonomousmany-body system,and the six basic one-qubit gates can be realized by adjusting the applied time-dependent magneticfield.

关键词： algebraic dynamics anisotropic spin cluster universal one-qubit logic gate

Using support vector machine for materials design

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Advances in Manufacturing 2013年第2期1卷 151-159页

作者： Wen-Cong Lu xiao-bo ji Min-jie Li Liang Liu Bao-Hua Yue Liang-Miao Zhang Department of Chemistry College of SciencesShanghai University

Materials design is the most important and fundamental work on the background of materials genome initiative for global competitiveness proposed by the National Science and Technology Council of America. As far as the methodologies of materials design, besides the thermodynamic and kinetic methods combing databases, both deductive approaches so-called the first principle methods and inductive approaches based on data mining methods are gaining great progress because of their suc- cessful applications in materials design. In this paper, support vector machine （SVM）, including support vector classification （SVC） and support vector regression （SVR） based on the statistical learning theory （SLT） proposed by Vapnik, is introduced as a relatively new data mining method to meet the different tasks of materials design in our lab. The advantage of using SVM for materials design is discussed based on the applications in the formability of perovskite or BaNiO3 structure, the prediction of energy gaps of binary compounds, the prediction of sintered cold modulus of sialon-corundum castable, the optimization of electric resistances of VPTC semiconductors and the thickness control of In203 semiconductor film preparation. The results presented indicate that SVM is an effective modeling tool for the small sizes of sample sets with great potential applications in materials design.

关键词： Support vector machine Materials genomeinitiative Materials design Data mining Quantitative

Early and delayed castrations confer a similar survival advantage in TRAMP mice

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Asian Journal of Andrology 2009年第3期11卷 291-297页

作者： Zai-Xian Zhang Qing-Quan Xu xiao-bo Huang ji-Chuan Zhu xiao-Feng Wang Department of Urology Peking University People＇s Hospital Beijing 100044 China

The most appropriate time to introduce androgen deprivation therapy for prostate cancer remains controversial. Our aim was to evaluate the effects of early versus delayed surgical castration on prostate cancer progression and survival in the transgenic adenocarcinoma of the mouse prostate （TRAMP） model. TRAMP mice were randomly divided into three groups： the early castration group （on which castration was performed at the age of 4 weeks）, the delayed castration group （on which castration was performed when abdominal tumours could be palpated）, and the sham-castrated group. Mice were monitored daily throughout their lives until cancer-related death or the develop- ment of an obviously moribund appearance, at which time the individual mouse was killed. Androgen receptor expression in prostate tumours was also evaluated. The results shows that the average lifespan in early castration, delayed castration and sham-castrated groups were 54.1 weeks, 59.9 weeks and 39.1 weeks, respectively. both early castration and delayed castration conferred a statistically significant survival advantage when compared with the sham-castrated group （P 〈 0.001）. However, the difference in lifespan between the early castration group and the delayed castration group was not statistically significant （P = 0.85）. The increase in lifespan in the TRAMP mice that received either early or delayed castration correlated with lower G/B value （genitourinary tract weight/body weight） at death than the sham-castrated mice. In conclusion, early and delayed castrations in TRAMP mice pro- longed survival to a similar extent. This finding may provide a guide for clinical practice in prostate cancer therapy.

关键词： castration prostate cancer survival TRAMP

Selective recovery of Cu(Ⅱ) through polymer inclusion membranes mediated with 2-aminomethylpyridine derivatives

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Transactions of Nonferrous Metals Society of China 2021年第11期31卷 3591-3601页

作者： Xue-jing QIU jia TANG Jun TAN Hui-ping HU xiao-bo ji jiu-gang HU College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China

The Cu(Ⅱ) separation behaviors with polymer inclusion membranes(PIMs) are explored by modifying 2-aminomethylpyridine derivatives with hydrophobic alkyl chains, including 2-[N-(tert-butyloxycarbonylmethyl)-2-picolyamino]acetate(AMB), N,N-dioctyl-2-aminomethylpyridine(AMD), tert-butyl 2-(N-octyl-2-picolyamino) acetate(AMC), and N,N-didecyl-2-aminomethylpyridine(AME). The transport flux and selectivity of Cu(Ⅱ) are determined by optimizing composition and structure of carriers and plasticizers. The results show that the hydrophobic modification of 2-aminomethylpyridine derivatives can boost the selective transport of copper ions in PIMs and membrane stability. In the optimum composition of 30 wt.% PVC, 30 wt.% AME, and 40 wt.% NPOE, the initial flux of Cu(Ⅱ) is 5.8×10^(−6) mol·m^(−2)·s^(−1). The FT-IR and XPS spectra identify that the alkyl amine functional groups of AME involve in the transport of copper chloride species. The SAXS analysis demonstrates that the generated micro-channels in PIMs induced by the hydrophobic modification of 2-aminomethylpyridine derivatives can contribute to the enhanced Cu(Ⅱ) flux.

关键词： hydrophobic modification 2-aminomethylpyridine derivative polymer inclusion membrane Cu(Ⅱ) separation

Effect of lithium content on electrochemical property of Li_(1+x)(Mn_(0.6)Ni_(0.2)Co_(0.2))_(1-x)O_2(0≤x≤0.3) composite cathode materials for rechargeable lithium-ion batteries

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Transactions of Nonferrous Metals Society of China 2018年第1期28卷 145-150页

作者： Cheng-chi PAN Ying-chang YANG Hong-shuai HOU Ming-jun jiNG Yi-rong ZHU Wei-xin SONG xiao-bo ji College of Chemistry and Chemical Engineering Central South University Changsha 410083 China

In order to confirm the optimal Li content of Li-rich Mn-based cathode materials(a fixed mole ratio of Mn to Ni to Co is0.6:0.2:0.2),Li1+x(Mn0.6Ni0.2Co0.2)1-xO2(x=0,0.1,0.2,0.3)composites were obtained,which had a typical layered structure with R3m and C2/m space group observed from X-ray powder diffraction(XRD).Electron microscopy micrograph(SEM)reveals that the particle sizes in the range of0.4-1.1μm increase with an increase of x ***1.2(Mn0.6Ni0.2Co0.2)0.8O2sample delivers a larger initial discharge capacity of275.7mA·h/g at the current density of20mA/g in the potential range of2.0-4.8V,while Li1.1(Mn0.6Ni0.2Co0.2)0.9O2shows a better cycle performance with a capacity retention of93.8%at0.2C after50cycles,showing better reaction kinetics of lithium ion insertion and extraction.

关键词： cathode material Li1+x(Mn0.6Ni0.2Co0.2)1-xO2 electrochemical property lithium-ion battery

Microstructure and properties of Cu−2Cr−1Nb alloy fabricated by spark plasma sintering

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Transactions of Nonferrous Metals Society of China 2022年第7期32卷 2276-2289页

作者： Ya-ke REN Xue-qian LÜ Zu-ming LIU Bing WEI Ting LEI Quan LI xiao-bo ji Wen-tao DENG Yong-kang AI State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China School of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China

Cu−2Cr−1Nb alloy was fabricated by spark plasma sintering(SPS)using close coupled argon-atomized alloy powder as the raw *** optimal SPS parameters obtained using the L9(3^(4))orthogonal test were 950℃,50 MPa and 15 min,and the relative density of the as-sintered alloy was 99.8%.The rapid densification of SPS effectively inhibited the growth of the Cr_(2)Nb phase,and the atomized powder microstructure was maintained in the grains of the alloy *** distributed multi-scale Cr_(2)Nb phases with grain sizes of 0.10−0.40μm and 20−100 nm and fine grains of alloy matrix with an average size of 3.79μm were *** heat treatment at 500℃ for 2 h,the room temperature tensile strength,electrical conductivity,and thermal conductivity of the sintered Cu−2Cr−1Nb alloy were 332 MPa,86.7%(IACS),and 323.1 W/(m·K),respectively,and the high temperature tensile strength(700℃)was 76 MPa.

关键词： Cu−Cr−Nb alloy spark plasma sintering Cr_(2)Nb phase microstructure properties

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污染河流生态修复研究现状与进展

环境科学与技术 2011年第3期34卷 138-143页

作者：江惠霞肖继波浙江林学院环境科技学院浙江临安311300

随着工农业的迅速发展,大量的生活生产污水排入河流,造成河流严重污染。污染河流的治理已引起人们的广泛关注,生态修复作为一种比较新颖的河道治理方法,有很好的应用前景。目前主要的生态修复方法有:(1)物理方法:底泥疏浚、机械除藻;(2... 详细信息

随着工农业的迅速发展,大量的生活生产污水排入河流,造成河流严重污染。污染河流的治理已引起人们的广泛关注,生态修复作为一种比较新颖的河道治理方法,有很好的应用前景。目前主要的生态修复方法有:(1)物理方法:底泥疏浚、机械除藻;(2)化学方法:化学除藻、絮凝沉淀;(3)生物-生态技术:河道曝气、土地处理技术、生态疏浚、生态混凝土、水生植物修复、微生物修复。文章从富营养化控制和有机物治理两方面对目前运用的生态修复方法加以阐述,重点介绍了生物-生态技术在河流生态修复方面的发展和运用,指出了我国在河流生态修复领域存在的问题,给出了对此领域的相关建议,并对其发展方向进行了展望。

关键词：污染河流生态修复生物-生态技术植物修复微生物降解

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水处理生物膜载体研究进展

浙江林学院学报 2010年第3期27卷 451-455页

作者：蒋凯凤肖继波浙江林学院工程学院浙江临安311300 浙江林学院环境科技学院浙江临安311300

生物膜载体是生物膜工艺的核心部分,载体的选择适当与否直接影响到废水的处理效果。概述了废水处理用生物膜载体的现状与发展,重点介绍了有机合成高分子生物膜载体在亲水性、生物亲和性和磁性等方面的改性研究,壳聚糖、藻酸盐和纤维素... 详细信息

生物膜载体是生物膜工艺的核心部分,载体的选择适当与否直接影响到废水的处理效果。概述了废水处理用生物膜载体的现状与发展,重点介绍了有机合成高分子生物膜载体在亲水性、生物亲和性和磁性等方面的改性研究,壳聚糖、藻酸盐和纤维素等可降解材料作为生物膜载体在废水处理中的应用研究。针对当今生物膜载体应用带来的二次污染问题,提出了解决办法和发展方向,指出可降解生物膜载体的应用可有效避免废弃生物膜载体处理带来的二次污染,是生物膜载体研究的一个重要发展方向。

关键词：水处理生物膜载体改性可降解综述