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A Ca-substituted air-stable layered oxide cathode material with facilitated phase transitions for high-performance Na-ion batteries

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Rare Metals 2024年第11期43卷 5701-5711页

作者： Shu-Bing Wei yong-Ju He Yan tang Hong-Wei Fu jiang Zhou Shu-Quan Liang Xin-Xin Cao School of Materials Science and Engineering Central South UniversityChangsha 410083China School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province Central South UniversityChangsha 410083China School of Physics and Electronics Hunan UniversityChangsha 410082China

Cost-efficient and high-performance cathodes play a crucial role in the advancement of grid-sc ale sodium-ion batteries(SIBs).As promising high-capacity cathode materials for SIBs,O_(3)-type Na-based layered transition metal oxides constantly experience inadequate air stability and complex phase ***,a comprehensive investigation was conducted to explore the impact of Ca substitution on both the electrochemical performance and structural stability of O_(3)-Na_(1-2x)Ca_xNi_(0.25)Fe_(0.5)Mn_(0.25)O_(2)(x=0.0.02 and 0.05)that is *** proper Ca content,O_(3)-type Na_(0.96)Ca_(0.02)-Ni_(0.25)Fe_(0.5)Mn_(0.25)O_(2)can deliver a reversible capacity of122.1 mAh·g^(-1)at 10 mA·g^(-1),with capacity retention of83.4%after 200 cycles at 50 mA·g^(-1)and good rate *** air sensitivity is investigated,and its potential as the Na host in full cells has been *** situ X-ray diffraction reveals the facilitated O_(3)-P_(3)-O_(3)phase transitions of such cathode during the whole electrochemical *** a simple and effective strategy may reveal a new avenue for high-stable O_(3)-type cathodes and promote the practical applications of SIBs.

关键词： Sodium-ion batteries O_(3)-type layered oxides Calcium-substitution Air-stable

The Stochastic Wave Equations Driven by Fractional and Colored Noises

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Acta Mathematica Sinica,English Series 2010年第6期26卷 1055-1070页

作者： Dan tang yong Jin WANG School of Mathematical Sciences and LPMC Nankai University Tianjin 300071 P. R. China School of Mathematical Sciences and School of Business Nankai University Tianjin 300071 P. R. China

We investigate a wave equation in the plane with an additive noise which is fractional in time and has a non-degenerate spatial covariance. The equation is shown to admit a process-valued solution. Also we give a cont... 详细信息

关键词： fractional spatial colored noise process-valued solution stochastic wave equations

Five Consecutive Positive Odd Numbers None of Which Can Be Expressed as a Sum of Two Prime Powers Ⅱ

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Acta Mathematica Sinica,English Series 2008年第11期24卷 1883-1890页

作者： yong Gao CHEN Min tang Department of Mathematics Nanjing Normal University Nanjing 210097 P. R. China Department of Mathematics Anhui Normal University Wuhu 241000 P. R. China

In this paper, we find two integers k0, m of 159 decimal digits such that if k ≡ k0 （mod m）, then none of five consecutive odd numbers k, k - 2, k - 4, k - 6 and k - 8 can be expressed in the form 2^n ± p^α, wher... 详细信息

关键词： Erdos problems covering systems odd numbers sums of prime powers

Microstructure and dry sliding wear behavior of laser clad AlCrNiSiTi multi-principal element alloy coatings

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Rare Metals 2017年第7期36卷 562-568页

作者： Can Huang Yi-Zhou tang yong-Zhong Zhang An-Ping Dong Jian Tu Lin-jiang Chai Zhi-Ming Zhou School of Materials Science and Engineering Chongqing University of TechnologyChongqing 400054China Chongqing Municipal Key Laboratory of Institutions of Higher Education for Mould Technology Chongqing 400054China Center for Composites General Research Institute forNonferrous MetalsBeijing 100088China Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming Shanghai Jiao Tong UniversityShanghai 200240China

The approximately equimolar ratio A1CrNiSiTi multi-principal element alloy （MPEA） coatings were fab- ricated by laser cladding on Ti-6Al-4V （Ti64） alloy. Scanning electron microscopy （SEM）, equipped with an energy-dispersive spectroscopy （EDS）, and X-ray diffrac- tion （XRD） were used to characterize the microstructure and composition. Investigations show that the coatings consist of （Ti, Cr）5Si3 and NiA1 phases, formed by in situ reaction. The phase composition is initially explicated according to obtainable binary and ternary phase diagrams, and the formation Gibbs energy of TisSi3, VsSi3 and CrsSi3. Dry sliding reciprocating friction and wear tests of the A1CrNiSiTi coating and Ti64 alloy substrate without coating were evaluated. A surface mapping profiler was used to evaluate the wear volume. The worn surface was characterized by SEM-EDS. The hardness and wear resistance of the A1CrNiSiTi coating are well compared with that of the basal material （Ti64）. The main wear mechanism of the AICrNiSiTi coating is slightly adhesive transfer from GCrl5 counterpart, and a mixed layer com- posed of transferred materials and oxide is formed.

关键词： Laser cladding Multi-principal element alloy Microstructure Wear behavior

Effect of interface morphology on the mechanical properties of titanium clad steel plates

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International Journal of Minerals,Metallurgy and Materials 2012年第5期19卷 404-408页

作者： Ji-xiong Liu Ai-min Zhao Hai-tao jiang Di tang Xiao-ge Duan Heng-yong Shui Research Institute of Metallurgy Engineering University of Science and Technology BeijingBeijing 100083China

Interface morphology has important influence on the bond quality of titanium clad steel plates. The mechanical properties of titanium clad steel plates with wavy and straight interfaces were investigated by tensile-shear tests and bending tests. The interface morphology of the plates was examined by optical microscopy （OM） and scanning electron microscopy （SEM）. The experimental results show that the shear strength of a wavy interface is higher than that of a straight interface. A wavy interface is the guarantee for obtaining high shear strength to provide a greater shear resistance. During the maerobending process, cracks appear in the swirl of the wave tip and ferrotitanium intermetallies. For in-situ observing the bending process by SEM, the wave tip of a wavy interface and the massive ferrotitartium intermetallies of a straight interface are places where cracks initiate and propagate. The results are the same as those observed in the macrobending process. Became of high hardness, the wave tip and the massive ferrotitanium intermetallies are hard in terms of compatible deformation.

关键词： clad metals cladding titanium low carbon steel interfaces morphology mechanical properties

TR PIV Experimental Investigation on Bypass Transition Induced by a Cylinder Wake

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Chinese Physics Letters 2011年第5期28卷 172-175页

作者： tang Zhan-Qi jiang Nan Department of Mechanics Tianjin UniversityTianjin 300072 Tianjin Key Laboratory of Modern Engineering Mechanics Tianjin UniversityTianjin 300372

The process of laminar to turbulent transition induced by a cylinder wake is studied by time-resolved(TR)particle image velocimetry(PIV)in a water *** combination of multi-scale local-averaged structure function analysis with criteria is used to identify the generation of secondary transverse vortex structure andto track its evolution along the *** the beginning of transition,with the decent of cylinder wake vortex,the secondary vortex structure is induced near the *** the secondary vortex moves dovnstream,it is induced to lift up by the wake vortex,meanwhile they are diffused and *** to the method of spatial conditional average,a low-speedhump is found in the near-wallregion along the bypass transition zone,accompanied by a low-speed region in the free stream occupied by the vake *** further downstream,the hump in the near-wall region becomes more and more *** the later stage of transition zone,hairpin vortex can be seen by conditional-averaged low-pass filtered *** hairpin head is almost vertical to the wall with an inclination angle of about 90°,which is attributed to the additional lift-up behavior induced by wake *** can be concluded that in the process of bypass transition,the wake vortex would not only induce the secondary vortex but also leaven its growth and evolution,resulting in the robust and rapidly growing hairpin vortex.

关键词： vortex cylinder averaged

A dynamic signal coordination control method for urban arterial roads and its application

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Frontiers of Information Technology & Electronic Engineering 2016年第9期17卷 907-918页

作者： Guo-jiang SHEN yong-yao YANG College of Computer Science and Technology Zhejiang University of Technology Zhejiang Zheda Supcon Information Technique Co. Ltd.

We propose a novel dynamic traffic signal coordination method that takes account of the special traffic flow characteristics of urban arterial roads. The core of this method includes a control area division module and a signal coordination control module. Firstly, we analyze and model the influences of segment distance, traffic flow density, and signal cycle time on the correlation degree between two neighboring intersections. Then, we propose a fuzzy computing method to estimate the correlation degree based on a hierarchical structure and a method to divide the control area of urban arterial roads into subareas based on correlation degrees. Subarea coordination control arithmetic is used to calculate the public cycle time of the control subarea, up-run offset and down-run offset of the section, and the split of each intersection. An application of the method in Shaoxing City, Zhejiang Province, China shows that the method can reduce the average travel time and the average stop rate effectively.

关键词： Urban arterial Control subarea Coordination control Correlation degree Fuzzy logic Intelligent transportation

Management of patients with sphincter of Oddi dysfunction based on a new classification

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World Journal of Gastroenterology 2011年第3期17卷 385-390页

作者： Jia-Qing Gong Jian-Dong Ren Fu-Zhou Tian Rui jiang Li-Jun tang yong Pang Department of General Surgery the People's Liberation Army General Hospital of Chengdu Command Chengdu 610083 Sicuan Province China Department of Radiology General Hospital of Chengdu Command Chengdu 610083 Sicuan Province China

AIM: To propose a new classif ication system for sphincter of Oddi dysfunction (SOD) based on clinical data of patients. METHODS: The clinical data of 305 SOD patients documented over the past decade at our center were analyzed retrospectively, and typical cases were reported. RESULTS: The new classification with two more types (double-duct, biliary-pancreatic reflux) were set up on the basis of the Milwaukee criteria. There were 229 cases of biliary-type SOD, including 192 (83.8%) cases cured endoscopically, and 29 (12.7%) cured by open abdominal surgery, and the remaining 8 (3.5%) cases observed with unstable outcomes. Eight (50%) patients with pancreatic-type SOD were cured by endoscopic treatment, and the remaining 8 patients were cured after open abdominal surgery. There were 19 cases of double-duct-type SOD, which consisted of 7 (36.8%) patients who were cured endoscopically and 12 (63.2%) who were cured surgically. A total of 41 cases were diagnosed as biliary-pancreatic-reflux-type SOD. Twenty (48.8%) of them were treated endoscopically, 16 (39.0%) were treated by open abdominal surgery, and 5 (12.2%) were under observation. CONCLUSION: The newly proposed SOD classification system introduced in this study better explains the clinical symptoms of SOD from the anatomical perspective and can guide clinical treatment of this disease.

关键词： Sphincter of Oddi dysfunction Classification Diagnosis Treatment

Recent Progress on Highly Selective and Sensitive Electrochemical Aptamer-based Sensors

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Chemical Research in Chinese Universities 2022年第4期38卷 866-878页

作者： tang Tianwei LIU Yinghuan jiang Ying College of Chemistry Beijing Normal UniversityBeijing 100875P.R.China Beijing National Laboratory for Molecular Sciences Beijing 100190P.R.China

Highly selective,sensitive,and stable biosensors are essential for the molecular level understanding of many physiological activities and *** aptamer-based(E-AB)sensor is an appealing platform for measurement in biological system,attributing to the combined advantages of high selectivity of the aptamer and high sensitivity of electrochemical *** review summarizes the latest development of E-AB sensors,focuses on the modification strategies used in the fabrication of sensors and the sensing strategies for analytes of different sizes in biological system,and then looks forward to the challenges and prospects of the future development of electrochemical aptamerbased sensors.

关键词： Electrochemical biosensor Aptamer Biomolecular recognition Biological system