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Cosmological Dynamics of de Sitter Gravity

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Chinese Physics Letters 2011年第4期28卷 36-39页

作者： ao Xi-chen LI Xin-Zhou XI Ping Shanghai United Center for Astrophysics(SUCA) Shanghai Normal University100 Guilin RoadShanghai 200234

A new cosmological model based on the de Sitter gravity is investigated by dynamical analysis and numerical *** some transformations,the evolution equations of this model can form an autonomous system with 8 physical critical *** these critical points there exist one positive attractor and one negative *** positive attractor describes the asymptotic behavior of late-time universe,which indicates that the universe will enter the exponential expansion phase,*** numerical calculations are also carried out,which convince us of this conclusion derived from the dynamical analysis.

关键词： attractor dynamical Sitter

Strategies of binder design for high-performance lithium-ion batteries:a mini review

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Rare Metals 2022年第3期41卷 745-761页

作者： Yan-Bo Wang Qi Yang Xun Guo Shuo Yang ao chen Guo-Jin Liang Chun-Yi Zhi Department of Materials Science and Engineering City University of Hong KongKowloon 999077Hong KongChina Hong Kong Center for Cerebro-Cardiovascular Health Engineering(COCHE) Shatin 999077Hong KongChina

Developing high-performance lithium-ion batteries (LIBs) with high energy density, rate capability and long cycle life are essential for the ever-growing practical application. Among all battery components, the binder plays a key role in determining the preparation of electrodes and the improvement of battery performance, in spite of a low usage amount. The main function of binder is to bond the active material, conductive additive and current collector together and provide electron and ion channels to improve the kinetics of electrochemical reaction. With the ever-increasing requirement of high energy density by LIBs, technical challenges such as volume expansion and active material dissolution are attracting worldwide attentions, where binder is thought to provide a new *** are two main categories (organic solvent soluble binder and water-soluble binder) and abundant polar functional groups providing adhesion ability. It is of great significance to timely summarize the latest progress in battery binders and present the principles for designing novel binders with both robust binding interaction and outstanding electrode stabilization function. This review begins with an introduction of the binding mechanism and the related binding forces, including mechanical interlocking forces and interfacial forces. Then, we discussed four different strategies (the enhancement of binding force,the formation of three-dimensional (3D) network, the enhancement of conductivity and binders with special functions) for constructing ideal binder system in order to satisfy the specific demands of different batteries, such as LIBs and lithium–sulfur (Li–S) batteries. Finally, some prospective and promising directions of binder design are proposed based on the existing and emerging binders and guide the development of the next-generation LIBs.

关键词： Lithium-ion batteries Binder Binding mechanism Binder design

Tautening effect mechanism of titanium-alloy InterTAN nail

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Rare Metals 2023年第12期42卷 4226-4233页

作者： Xiang-Sheng Gao Sheng-Kai Ma Wang-ao-Ran chen Min Wang Qi Pan Zi-Yu Liu Beijing Key Laboratory of Advanced Manufacturing Technology Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China The Fourth People's Hospital of Jinan Jinan 250031China School of Engineering Medicine Beihang UniversityBeijing 100191China Division of Surgery&Interventional Science University College LondonRoyal National Orthopaedic HospitalLondon HA74LPUK

Although InterTAN(IT)nails are widely employed to treat femoral intertrochanteric fractures,the mechanism behind the tautening effect of titanium-alloy IT nails is not well *** study aimed to reveal the mechanism of this effect.A torque test experiment was conducted,with the torque value recorded and transformed to obtain the tautening ***,theoretical and finite element analyses were performed to further understand the *** influence of age and pitch-difference on the tautening effect was also examined in the study,the results attributed to the pitch-varying integrated interlocking lag *** torque and the corresponding tautening effect drastically increase as the screw is inserted deeper during the second stage,while the torque measured in the first stage is always ***,the tautening force increases with increasing age,this relationship helps evaluate the effect at different *** tautening effect also increases nearly linearly with the pitch difference,which can be adjusted during the IT design stage to select or design IT in engineering practice.

关键词： Tautening effect InterTAN nail Finite element analysis Torque

High uniformity and stability of 1S1R directly stacked for high-density cross-point memory applications

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Rare Metals 2022年第11期41卷 3671-3676页

作者： Zhi-Ying Yu Jia-Yi Zhao Guo-Kun Ma ao chen Da-Lei chen Yi-Heng Rao Hao Wang Hubei Yangtze Memory Laboratories Wuhan430205China School of Microelectronic Hubei UniversityWuhan430062China School of Physics and Technology Wuhan UniversityWuhan430072China

In this letter,the Ti-doped NbO_(x)-based selector is applied to SiNOx-based resistive random-access memory(RRAM),forming Pt/NbOx(Ti-doped)/SiNO_(x)/Ti one selector-one RRAM device(1S1R),to suppress the sneak path *** fabricated 1S1R exhibits stable direct current(DC)endurance(>200 cycles),suitable memory window(>40),matched selectivity(>40)and high uniformity of switching parameters.

关键词： Ti stability high

Preparation of yttrium oxide coating with enhanced thermal shock resistance on refractories used for titanium alloy melting and casting

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Journal of Iron and Steel Research International 2024年第6期31卷 1411-1422页

作者： ao chen Yan Ma Zhou-fu Wang Hao Liu Xi-tang Wang Sen-na chen chen-xin Zhang Zi-yi Tang Wei-dong Fu Wei cheng The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina Xiangyang Juli High Technology Material Co. Ltd.Xiangyang 441705HubeiChina Xiangyang Public Inspection and Testing Center Xiangyang 441000HubeiChina

In order to enhance the service life of refractories for melting and casting of titanium alloy,preparation of yttrium oxide coatings on the refractories surface is an effective *** improvement of thermal shock stability of the coating is beneficial to its spalling resistance during the high-temperature service,and the available slurry with good performance is the *** effects of the varieties and contents of dispersant(sodium tripolyphosphate,sodium hexametaphosphate,sodium pyrophosphate,citric acid and polycarboxylate ammonium salt)and binder(aluminum dihydrogen phosphate,zirconium acetate and yttria sol)on the stability,rheological and thixotropic properties of yttrium oxide waterbased slurry were investigated,and the effects of slurry composition design on the thermal shock resistance of the coating were *** results showed that the introduction of polycarboxylate ammonium salt as dispersant significantly improved the stability of the slurry,and the varieties of the binders had significant effects on the dispersibility of the *** aluminum dihydrogen phosphate and polycarboxylate ammonium salt were used as binder and dispersant,respectively,the slurry had better stability,suitable rheological and thixotropic *** using aluminum dihydrogen phosphate as binder,the coating had good thermal shock resistance and no obvious cracks were observed for the coating after thermal shock,which was attributed to the yttrium aluminate binding phase generated in the *** effective method was provided for preparing yttrium oxide coatings with enhanced thermal shock resistance applied in the process of titanium alloy melting and casting.

关键词： Yttrium oxide-Slurry Stability Rheological property Thixotropic property-Coating Thermal shock resistance

Observation of the density dependence of the closed-channel fraction of a 6Li superfluid

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National Science Review 2022年第10期9卷 105-111页

作者： Xiang-Pei Liu Xing-Can Yao Hao-Ze chen Xiao-Qiong Wang Yu-Xuan Wang Yu-ao chen Qijin chen Kathryn Levin Jian-Wei Pan Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics University of Science and Technology of China Shanghai Branch CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China Shanghai Research Center for Quantum Sciences James Franck Institute University of Chicago

Atomic Fermi gases provide an ideal platform for studying pairing and superfluid physics,using a Feshbach resonance between closed-channel molecular states and open-channel scattering *** particular interest is the strongly interacting *** show that the closed-channel fraction Zccprovides an effective probe for important many-body interacting effects,especially through its density dependence,which is absent from two-body theoretical *** we measure Zccas a function of interaction strength and the Fermi temperature TF in a trapped 6Li superfluid throughout the entire Bardeen-Cooper-Schrieffer-Bose-Einstein-condensate crossover,in quantitative agreement with theory when important thermal contributions outside the superfluid core are taken into *** from the deep-BEC regime,the fraction Zccis sensitive to *** particular,our data show Zcc∝TFαwith α=1/2at unitarity,in quantitative agreement with calculations of a two-channel pairing fluctuation theory,and a increases rapidly into the BCS regime,reflecting many-body interaction effects as predicted.

关键词： closed-channel fraction density dependence strongly interacting Fermi gas many-body effect

Exhausted local lactate accumulation via injectable nanozyme-functionalized hydrogel microsphere for inflammation relief and tissue regeneration

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Bioactive Materials 2022年第6期7卷 153-168页

作者： Jieliang Shen ao chen Zhengwei Cai Zhijie chen Ruichao Cao Zongchao Liu Yuling Li Jie Hao Department of Orthopedics Orthopedic Laboratory of Chongqing Medical UniversityThe First Affiliated Hospital of Chongqing Medical UniversityNo.1 Youyi RoadChongqing40042PR China School of Biomedical Engineering Shanghai Jiao Tong University1954 Huashan RoadShanghai200030PR China Department of Orthopaedics Shanghai Key Laboratory for Prevention and Treatment of Bone and Joint DiseasesShanghai Institute of Traumatology and OrthopaedicsRuijin HospitalShanghai Jiao Tong University School of Medicine197 Ruijin 2nd RoadShanghai200025PR China Department of Orthopaedics Affiliated Hospital of North Sichuan Medical CollegeNo.63 Wenhua RoadNanchongSichuan637000PR China Department of Orthopaedics Affiliated Hospital of Traditional Chinese MedicineSouthwest Medical UniversityNo.182 Chunhui RoadSichuan646699PR China

Local lactate accumulation greatly hinders tissue repair and regeneration under ischemic ***,an injectable microsphere(MS@MCL)for local lactate exhaustion was constructed by grafting manganese dioxide(MnO_(2))-lactate oxidase(LOX)composite nanozyme on microfluidic hyaluronic acid methacrylate(HAMA)microspheres via chemical bonds,achieving a long-term oxygen-promoted lactate exhaustion effect and a long half-life in *** uniform and porous microspheres synthesized by microfluidic technology is beneficial to in situ injection therapy and improving encapsulation ***,chemical grafting into HAMA microspheres through amide reactions promoted local enzymatic concentration and activity *** was showed that the MS@MCL eliminated oxidative and inflammatory stress and promoted extracellular matrix metabolism and cell survival when co-cultured with nucleus pulposus cells(NPCs)in *** the rat degenerative intervertebral disc model caused by lactate injection,MS@MCL showed a long-term therapeutic effect in reducing intervertebral height narrowing and preventing extracellular matrix(ECM)degradation as well as inflammatory damage in ***,this study confirms that this nanozyme-functionalized injectable MS@MCL effectively improves the regenerative and reparative effect in ischemic tissues by disposing of enriched lactate in local microenvironment.

关键词： Hydrogel microsphere Microfluidic Lactate Tissue regeneration Injection

A culture-dependent survey of thermophilic bacteria from hot springs in Xiamen area in China

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Acta Oceanologica Sinica 2009年第1期28卷 62-71页

作者： YANG Bo OUYANG Jianping ao Jingqun chen Xinhua Key Laboratory of Marine Biogenetic Resources Third Institute of Oceanography State Oeeanie Administration Xiamen 361005 China

Microbes are believed to play important roles in ecosystem function in many *** hot springs of Xiamen Island are close to the Xiamen Sea,and may have some characteristics different from those of inland hot *** living in the hot springs of Xiamen may have new ***,little is known about microbial communities of hot springs close to the Xiamen Sea.A culture-dependent survey of microbial population in the Xiamen hot springs was performed by using an approach combining total cellular protein profile identification and 16S rRNA gene sequencing.A total of 328 isolates of bacteria were obtained from liquid and sediment samples from the Xiamen hot springs,including neutrophilic thermophilic bacteria and moderately thermophilic *** thermophilic bacteria,which grow at a temperature range of 55-90℃ including Rhodothermus marinus（Strain 1）,Thermus thermophilus（Strain 2）,Thermus thiopara（Strain 3）,Geobacillus stearothermophilus（Strain 4）,Geobacillus thermoleovorans（Strain 5）,and Pseudomonas pseudoalcaligenes（Strain 6）,were recovered by 2216E *** thermophilic acidophiles,which can grow at temperatures above 50℃ and a pH range of 1.8-3.5 such as Alicyclobacillus acidoterrestris（Strain 8）,Sulfobacillus acidophilus（Strain 9）,and Sulfobacillus thermosulfidooxidans（Strain 10）,were isolated on selective solid medium containing sulfur and Fe2＋.Among these strains,Rhodothermus marinus,Thermus thermophilus and Geobacillus stearothermophilus are not only thermophiles,but also *** bacterium strain（Strain 6） shared 99% nucleotide sequence homology with Pseudomonas pseudoalcaligenes on the 16S rRNA gene sequence,but was quite different from Pseudomonas pseudoalcaligenes in biological characteristics,suggesting that it may represent a novel thermophilic *** indicated that various species of neutrophilic thermophiles and moderately thermophilic acidophiles were widely distributed in the Xiamen

关键词： Xiamen sea hot springs thermophilic bacleria moderately thermophilic acidophiles cuhivable microbial community

Practicable method to identify ferromagnetic objects

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Science China(Technological Sciences) 2022年第12期65卷 3079-3081页

作者： YU XiangQian WANG YongFu XIao ChiJie LIU Si ZONG QiuGang chen HongFei ZOU Hong SHI WeiHong chen ao School of Earth and Space Sciences Peking UniversityBeijing 100871China School of Physics Peking UniversityBeijing 100871China School of Physics and Electronic Science Changsha University of Science&TechnologyChangsha 410114China

Ferromagnetic objects are ubiquitous in the world and the identification of ferromagnetic objects is important in many *** the position and magnetic parameters of the ferromagnetic object from its magnetic signature i... 详细信息

关键词： ferromagnetic signature mining

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