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Enhanced cycling stability of single-crystal LiNi_(0.83)Co_(0.07)Mn_(0.10)O_(2)by Li-reactive coating with H_(3)BO_(3)

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Rare Metals 2023年第8期42卷 2612-2621页

作者： Wen-Hui Hu Ya yin Ya Sun Guo-Xue Liu shun-yi yang You-Yuan Huang Bo Wang BTR New Material Group Co. LtdShenzhen 518000China Key Laboratory of Cluster Science Ministry of EducationSchool of Chemistry and Chemical EngineeringBeijing Instituteof Technology Beijing 100081China BTR Nano Tech Co. LtdShenzhen 518000China College of Chemistry and Environmental Engineering Wuhan Polytechnic UniversityWuhan 430023China

Ni-rich cathode materials will be primarily used as next-generation high-specific energy cathode materials in lithium-ion ***,residual Li formation and cracking considerably restrict the wide application of these *** address the issues related to cracking,micro-sized single-crystal cathode materials without internal grain boundaries are *** this study,we constructed a thin LiBO_(2)layer on the single-crystal LiNi_(0.83)Co_(0.07)Mn_(0.10)O_(2)particles by solvent-free H_(3)BO_(3)*** residual Li on the material surface decreased by 14%through the reaction of LiOH/Li_(2)CO_(3)and H_(3)BO_(3).The coated materials exhibited higher initial Coulombic efficiency(88.44%),higher reversible capacity(213.4 mAh·g^(-1)at 0.1 C),and better cycling performance(91.31%retention over 50 cycles within 3.0-4.3 V at 1.0C)than the unmodified *** the galvanostatic intermittent titration technique,electrochemical impedance spectroscopy(EIS),and inductively coupled plasma-optical emission spectroscopy(ICP-OES),we reveal the mechanism by which the electrochemical properties are improved upon H_(3)BO_(3)*** superior electrochemical performances are associated with increased Li+conductivity,lower charge transfer impedance,and suppressed transition metal ***,this study demonstrates the importance of surface modification in obtaining Ni-rich single-crystal materials with enhanced performance.

关键词： Ni-rich cathode Residual Li Cycling stability Li-reactive coating Single crystal

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A simplified and miniaturized glucometer-based assay for the detection of β-glucosidase activity

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2019年第3期20卷 264-274页

作者： Min-yi JIN Tong ZHANG yi-shun yang Yue DING Jun-song LI Gao-ren ZHONG Experiment Center for Teaching and Learning Shanghai University of Traditional Chinese MedicineShanghai 201203China School of Pharmacy Fudan UniversityShanghai 200032China

β-Glucosidase activity assays constitute an important indicator for the early diagnosis of neonatal necrotizing enterocolitis and qualitative changes in medicinal *** drawbacks of the existing methods are high consumption of both time and reagents,complexity in operation,and requirement of expensive instruments and highly trained *** present study provides a simplified,highly selective,and miniaturized glucometer-based strategy for the detection ofβ-glucosidase ***-factor experiments showed that optimumβ-glucosidase activity was exhibited at 50°C and pH 5.0 in a citric acid-sodium citrate buffer when reacting with 0.03 g/mL salicin for 30 *** procedure for detection was simplified without the need of a chromogenic *** of the analytical method demonstrated that the accuracy,precision,repeatability,stability,and durability were *** linear ranges ofβ-glucosidase in a buffer solution and rat serum were 0.0873–1.5498 U/mL and 0.4076–2.9019 U/mL,*** proposed method was free from interference fromβ-dextranase,snailase,β-galactosidase,hemicellulase,and glucuronic acid released by *** demonstrated that the proposed assay had a higher selectivity than the conventional dinitrosalicylic acid(DNS)assay because of the specificity for salicin and unique recognition of glucose by a personal glucose *** of the method resulted in a microassay forβ-glucosidase *** easy-to-operate method was successfully used to detect a series ofβ-glucosidases extracted from bitter almonds and cultured by Aspergillus *** addition,the simplified and miniaturized glucometer-based assay has potential application in the point-of-care testing ofβ-glucosidase in many fields,including medical diagnostics,food safety,and environmental monitoring.

关键词： Glucometer-based assay β-Glucosidase Activity detection

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聚苯乙烯嵌段对左旋聚乳酸/聚苯乙烯-b-右旋聚乳酸立构复合晶结晶行为的调控

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高分子学报 2023年第5期54卷 631-642页

作者：吴晗杨顺燚蒋妮甘志华有机无机复合材料国家重点实验室、生物医用材料(北京)实验室、北京化工大学生命科学与技术学院北京100029

聚乳酸较差的耐热性和较慢的结晶速率限制了其应用范围的扩展,左旋聚乳酸(PLLA)和右旋聚乳酸(PDLA)共混后形成的立构复合晶(SC)能够促进PLA均质晶(HC)的成核并提高其热稳定性,在改性PLA方面有着巨大应用前景.本研究通过可逆加成-断裂链... 详细信息

聚乳酸较差的耐热性和较慢的结晶速率限制了其应用范围的扩展,左旋聚乳酸(PLLA)和右旋聚乳酸(PDLA)共混后形成的立构复合晶(SC)能够促进PLA均质晶(HC)的成核并提高其热稳定性,在改性PLA方面有着巨大应用前景.本研究通过可逆加成-断裂链转移聚合(RAFT)和开环聚合(ROP)法,制备了一系列不同聚苯乙烯(PS)分子量的PS-b-PDLA嵌段共聚物,并将其与PLLA共混,探究了嵌段共聚物及共混物的组成与结晶性能之间的关系.研究结果表明,分子运动性较差的PS嵌段的引入使共混物的结晶更加困难,而低分子量的PS嵌段由于抑制了均质晶(HC)的形成,反而有利于大量立构复合晶(SC)的形成,进而提高了共混物的结晶速率.

关键词：聚乳酸聚苯乙烯嵌段共聚物立构复合

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一种根癌农杆菌介导的耐盐椒样薄荷含芽茎段转化系统

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生物技术通报 2017年第7期33卷 126-132页

作者：赵忠娟魏艳丽李纪顺王贻莲杨合同山东省科学院生态研究所济南250014

椒样薄荷的转基因技术是提高精油产量和品质的重要手段,为解决耐盐椒样薄荷叶片不定芽诱导过程中易褐化,难分化,不适合作为转基因外植体的问题,利用含芽的椒样薄荷茎段作为外植体建立了一种根癌农杆菌介导的外源基因转化体系。利用正交... 详细信息

椒样薄荷的转基因技术是提高精油产量和品质的重要手段,为解决耐盐椒样薄荷叶片不定芽诱导过程中易褐化,难分化,不适合作为转基因外植体的问题,利用含芽的椒样薄荷茎段作为外植体建立了一种根癌农杆菌介导的外源基因转化体系。利用正交试验对转化所用的根癌农杆菌菌液浓度、转化时间和共培养时间进行优化,结果显示:3个因素对转化效果的影响作用表现为转化时间(B)>菌液浓度(A)>共培养时间(C),筛选出的最优转化条件为菌液浓度为OD_(600)=0.8,转化时间为15 min,共培养时间为3 d。对不同转化液组分进行优化筛选,结果获得最适的转化液组分为:1/5MS+0.5 g/L MES(2-(N-吗啡啉)乙磺酸)+1%葡萄糖+2%蔗糖,PH5.4。利用不同植物表达载体进行转化,并通过基因组PCR和GUS染色进行转化植株的阳性检测,结果表明该转化体系适用于多种植物表达载体的转化,容易获得再生植株,为耐盐椒样薄荷的基因转化提供新的方法与体系。

关键词：椒样薄荷茎段根癌农杆菌植物表达载体基因组PCR GUS染色

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利用低品位软锰矿制备硫酸锰的工艺进展

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四川理工学院学报（自然科学版） 2011年第4期24卷 483-485页

作者：崔益顺杨静赵勇四川理工学院材料与化学工程学院四川自贡643000

介绍了目前利用低品位软锰矿制备硫酸锰的工艺现状以及目前正在开发的工艺,并且简述了它们的优缺点。对低品位软锰矿资源的开发利用具有一定的指导意义。

关键词：软锰矿硫酸锰工艺现状

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Cobalt（Ⅱ）-Catalyzed Bis-isocyanides Insertion Reactions with Boric Acidsand Sulfonyl Azides via Nitrene Radical Coupling

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Chinese Journal of Chemistry 2018年第11期36卷 1011-1016页

作者： Zheng-yang Gu Rong Zhang shun-yi Wang shun-Jun Ji Key Laboratory of Organic Synthesis of Jiangsu Province College of Chemistry Chemical Engineering and Materials Science & Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou Jiangsu 215123 China

A Co(II)‐catalyzed effective synthesis of amidinium imine derivatives from the reaction of isocyanides and boric acids using organic azides as nitrene source has been developed. This protocol provides a new, environment‐friendly and simple strategy to construct amidinium imine derivatives with a range of substrates without any oxidants and additives.

关键词： Co(II)‐catalysis isocyanide boric acids azides nitrene radical C1 building blocks

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Acyclic Edge Coloring of 1-planar Graphs without 4-cycles

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Acta Mathematicae Applicatae Sinica 2024年第1期40卷 35-44页

作者： Wei-fan Wang yi-qiao Wang Wan-shun yang Department of Mathematics Zhejiang Normal UniversityJinhua321004China School of Management Beijing University of Chinese MedicineBeijing100029China School of Mathematics and Information Science Weifang UniversityWeifang261061China

An acyclic edge coloring of a graph G is a proper edge coloring such that there are no bichromatic cycles in *** acyclic chromatic index χ'α(G) of G is the smallest k such that G has an acyclic edge coloring using k *** was conjectured that every simple graph G with maximum degree Δ has χ'_α(G) ≤Δ+2.A1-planar graph is a graph that can be drawn in the plane so that each edge is crossed by at most one other *** this paper,we show that every 1-planar graph G without 4-cycles has χ'_α(G)≤Δ+22.

关键词： 1-planar graph acyclic edge coloring acyclic chromatic index

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Even and Odd Coherent States for Time-Dependent Harmonic Oscillator

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Communications in Theoretical Physics 2002年第7期38卷 25-30页

作者： WEI Lian-Fu yang Qing-yi WANG shun-Jin Department of Physics Shanghai Jiao Tong University Shanghai 200030 China Department of Physics Guangxi University Nanning 530003 China Institute of Physics Southwest Jiao Tong University Chengdu 610031 China Department of Modern Physics Lanzhou University Lanzhou 730000 China

The dynamical invariant for a general time-dependent harmonic oscillator is constructed by making use of two linearly independent solutions to the classical equation of motion. In terms of this dynamical invariant we define the time-dependent creation and annihilation operators and relevantly introduce even and odd coherent states for time dependent harmonic oscillator. The mathematical and quantum statistical properties of these states are discussed in detail. The harmonic oscillator with periodically varying frequency is treated as a demonstration of our general approach.

关键词： even and odd coherent states, time-dependent harmonic oscillator, dynamical invariant

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A Geometric Based Connection between Fractional Calculus and Fractal Functions

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Acta Mathematica Sinica,English Series 2024年第2期40卷 537-567页

作者： Yong shun LIANG Wei yi SU School of Mathematics and Statistic Nanjing University of Science and TechnologyNanjing 210094P.R.China Department of Mathematics Nanjing UniversityNanjing 210023P.R.China

Establishing the accurate relationship between fractional calculus and fractals is an important research content of fractional calculus *** the present paper,we investigate the relationship between fractional calculus and fractal functions,based only on fractal dimension *** dimension of the Riemann-Liouville fractional integral of continuous functions seems no more than fractal dimension of functions *** fractal dimension of the Riemann-Liouville fractional differential of continuous functions seems no less than fractal dimension of functions themselves when they *** further discussion,fractal dimension of the Riemann-Liouville fractional integral is at least linearly decreasing and fractal dimension of the Riemann-Liouville fractional differential is at most linearly increasing for the Holder continuous *** about other fractional calculus,such as the Weyl-Marchaud fractional derivative and the Weyl fractional integral has also been given *** work is helpful to reveal the mechanism of fractional calculus on continuous *** the same time,it provides some theoretical basis for the rationality of the definition of fractional *** is also helpful to reveal and explain the internal relationship between fractional calculus and fractals from the perspective of geometry.

关键词： Fractional calculus fractal functions fractal dimension fractional calculus equation relationship

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Template sacrificial controlled synthesis of hierarchical nanoporous carbon@NiCo_(2)S_(4)microspheres for high-performance hybrid supercapacitors

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Rare Metals 2023年第8期42卷 2643-2657页

作者： Kai Yuan Teng-Jia Gao yang yang Wang Luo shun Li Chao-yang Zhang Jian-Xiong Xu Na Li yi-Rong Zhu Hunan Key Laboratory of Electrochemical Green Metallurgy Technology College of Materials and Advanced ManufacturingHunan University of TechnologyZhuzhou 412007China Hunan Key Laboratory of Biomedical Nanomaterials and Devices College of Life Sciences and ChemistryHunan University of TechnologyZhuzhou 412007China School of Metallurgy and Environment Central South UniversityChangsha 410083China

Binary transition metal sulfides are hotly investigated in advanced energy storage devices because of their ultra-high reversible ***,the unsatisfied rate capability and cycling stability still hinder their practical ***,hierarchical nanoporous carbon@NiCo_(2)S_(4)(HNCMs@NCS)composites with coreshell flower-like structures were prepared by in situ growing of NiCo_(2)S_(4) nanosheets on HNCMs through a hydro thermal-as sis ted template sacrificial *** from a synergistic effect between the NiCo_(2)S_(4)shell with high specific capacity and the HNCMs with unique porous structure,the synthesized flower-like HNCMs@NCS composites exhibit extraordinary electrochemical performances,including a high capacity of 346.9 mAh·g^(-1)at 1 A·g^(-1),superb rate property with86.4%initial capacity at 30 A·g^(-1)and predominant cycle stability with 81.2%capacity retention after 5000 ***,the resulting HNCMs@NCS cathode was coupled with the chemical-activated HNCMs(AHNCMs)anode to construct a hybrid supercapacitor *** asfabricated device exhibits superior energy density(49.9 Wh·kg^(-1)at 802 W·kg^(-1))and ultra-high power density(24 kW·kg^(-1)at 29.5 Wh·kg^(-1)).This fascinating result further demonstrates the tremendous prospect of the synthesized HNCMs@NCS composites as high-performance supercapacitor electrode materials.

关键词： Hybrid supercapacitors(HSCs) NiCo_(2)S_(4) Hierarchical nanoporous carbon(HNC) Template sacrificial method

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