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Solid solution strengthening of high-entropy alloys from first-principles study

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Journal of Materials Science & Technology 2022年第26期121卷 105-116页

作者： H.L.Zhang d.d.cai X.Sun H.Huang S.Lu Y.Z.Wang Q.M.Hu L.Vitos X.d.ding State Key Laboratory for Mechanical Behavior of Materials Frontier Institute of Science and TechnologyXi’an Jiaotong UniversityXi’an 710049China Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research College of StomatologyXi’an Jiaotong UniversityXi’an 710049China department of Materials Science and Engineering The Ohio State University2041 College RoadColumbusOH 43210United States Institute of Metal Research Chinese Academy of SciencesShenyang 110016China Science and Technology on Surface Physics and Chemistry Laboratory Jiangyou 621908China Applied Materials Physics Department of Materials Science and EngineeringRoyal Institute of TechnologyStockholm SE-10044Sweden

Solid solution strengthening(SSS)is one kind of strengthening mechanisms and plays an important role in alloy design,in particular for single-phase alloys including high-entropy alloys(HEAs).The classical Labusch–Nabarro model and its expansions are most widely applicable to treating SSS of solid solution alloys including both conventional alloys(CAs)and *** this study,the SSS effects in a series of Febased CAs and HEAs are investigated by using the classical Labusch–Nabarro model and its *** size misfit and shear modulus misfit parameters are derived from first-principles *** on available experimental data in combination with empirical SSS model,we propose fitting constants(i.e.,the ratio between experimental hardness and predicted SSS effect)for these two families of *** predicted host/alloy family-dependent fitting constants can be used to estimate the hardness of these SSS *** agreement between predicted and measured hardness values is satisfactory for both CAs and HEAs,implying that the proposed approach is reliable and successful.

关键词： Alloys Solid solution strengthening Hardness Size misfit parameter Shear modulus misfit parameter First-principles calculations

Nonlinear dispersion of Magnetostatic Surface Waves on Ferromagnetic Films

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Chinese Physics Letters 1991年第11期8卷 593-596页

作者： A.d.Boardman BAO Jiashan WANG Qi cai Yingshi S.A.Nikitav department of Pure and Applied Physics Salford UniversityUK department of Physics Shanghai University of Science and TechnologyShanghai 201800 Institute of Radio Engineering and Electronics USSR Accedemy of ScienceMoscowUSSR

The wave equation of nonlinear magnetostAtic surface waves(MSSW)on ferromagnetic films is derived and its solution is *** nonlhiear *** of MSSW is *** result shows tliat the wave power has a little effect to the frequency shift of MSSW with lower Irequency,but bas a considerably larger effect to that with higher frequency within the band.

关键词： dispersion wave Nonlinear

Whole genome synthesis： from poliovirus to synthetic yeast

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Frontiers of Electrical and Electronic Engineering in China 2017年第1期5卷 105-109页

作者： Junbiao dai Yizhi cai Yinjing Yuan Huanming Yang Jef d. Boeke Center for Synthetic Biology Engineering Research Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 China School of Biological Sciences The King's Buildings University of Edinburgh EH9 3BF United Kingdom Key Laboratory of Systems Bioengineering (Ministry of Education) SynBio Research Platform Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China BGI-Shenzhen Shenzhen 518083 China Institute for Systems Genetics and department of Biochemistry and Molecular Pharmacology New York University Langone Medical Center New York NY 10011 USA

About thirty years ago when the human genome project （HGP） was first proposed, there was widespread disagreement on whether it was worth spending $3 billion to sequence a genome with only 3% coding sequences, which ...

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Accurate and efficient follower log repair for Raft-replicated database systems

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Frontiers of Computer Science 2021年第2期15卷 91-103页

作者： Jinwei GUO Peng cai Weining QIAN Aoying ZHOU School of data Science and Engineering East China Normal UniversityShanghai200062China

State machine replication has been widely used in modern cluster-based database *** commonly deployed configurations adopt the Raft-like consensus protocol,which has a single strong leader which replicates the log to other *** the followers can handle read requests and many real workloads are usually read-intensive,the recovery speed of a crashed follower may significantly impact on the *** from traditional database recovery,the recovering follower needs to repair its local log *** Raft protocol takes many network round trips to do log comparison between leader and the crashed *** reduce network round trips,an optimization method is to truncate the follower’s uncertain log entries behind the latest local commit point,and then to directly fetch all committed log entries from the leader in one round ***,if the commit point is not persisted,the recovering follower has to get the whole log from the *** this paper,we propose an accurate and efficient log repair(AELR)algorithm for follower *** is more robust and resilient to follower failure,and it only needs one network round trip to fetch the least number of log entries for follower *** approach is implemented in the open source database system *** experimentally show that the system adopting AELR has a good performance in terms of recovery time.

关键词： Raft high availability log replication log repair

100-Gb/s undersea transmission with high spectral efficiency using pre-filtered QPSK modulation format

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Chinese Optics Letters 2010年第9期8卷 831-836页

作者： J.-X. cai Y. cai C. R. davidson d. G. Foursa A. Lucero O. Sinkin W. Patterson A. Pilipetskii G. Mohs Neal S. Bergano Tyco Electronics Subsea Communications LLC ("TE SubCom" formerly known as ~co Telecommunications (US) Inc.) 250 Industrial Way West Eatontown NJ 07724 USA

We provide a review of our recent 100-Gb/s, high spectral efficiency （SE） experiment targeting transoceanic and regional undersea transmission distances. We demonstrated that simple pre-filtering at the transmitter together with a maximum a posteriori probability （MAP） detection algorithm can significantly improve SE. We transmitted 96×100-Gb/s pre-filtered polarization division multiplexed return-to-zero quadrature phase shift keyed （PdM-RZ-QPSK） channels with 300% SE over 10608 km using 52-km spans of 150-μm 2 fiber and simple single-stage erbium-doped fiber amplifiers （EdFAs）. We also achieved 400% SE over 4368 km using similar techniques.

关键词： Bit error rate Erbium doped fiber amplifiers Modulation Optical signals Quadrature phase shift keying Signal processing

Superior piezoelectricity in lead-free barium titanate piezoceramics

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Journal of Materiomics 2024年第3期10卷 694-706页

作者： Enpei cai Shiqiang Peng Qibin Liu School of Materials and Metallurgy Guizhou UniversityGuiyang550025China Key Laboratory of Advanced Manufacturing Technology of the Ministry of Education Guiyang550025China

Since the 21st century,increasing environmental protection and human health concern have been the driving force to develop lead-free piezoelectric materials with enhanced performances,and phase en-gineering strategy has been validated to be a viable method in numerous ***,we gained a superb d_(33)~(637±30)pC/N in lead-free(1-x)(Ba_(0.93)Ca_(0.07))(Sn_(0.08)Ti_(0.92))O_(3-x)(Sb_(0.5)Li_(0.5))TiO_(3)[abbreviated as(1-x)BCST-xSLT,0≤x≤0.4%(in mole)]piezoelectrics utilizing chemical *** illustrate the relationship among composition-structure-performance,microstructure characterization,electrical properties measurement,first-principles calculation,and phase-field simulations were ***-resolved polarization mapping of z-contrast imaging manifests the ferroelectric three phases(ReOeT)coexist at the nanoscale with nanoscale polarization switching among *** calculations and simulations confirm that the high-density nano-domain boundary bridges the poly-phase coexisting nano-domains,which makes the polarization reversal easy,thus significantly reducing the energy barrier and polarization anisotropy among different phases.

关键词： Chemical doping Relaxor ferroelectrics Phase-field simulations Phase engineering strategy First-principles calculations

Hollow vortex Gaussian beams

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Science China(Physics,Mechanics & Astronomy) 2013年第5期56卷 896-903页

作者： ZHOU GuoQuan cai YangJian dAI ChaoQing School of Sciences Zhejiang A & F University School of Physical Science and Technology Soochow University

A kind of hollow vortex Gaussian beam is introduced. Based on the Collins integral, an analytical propagation formula of a hollow vortex Gaussian beam through a paraxial ABCd optical system is derived. due to the special distribution of the optical field, which is caused by the initial vortex phase, the dark region of a hollow vortex Gaussian beam will not disappear upon propagation. The analytical expressions for the beam propagation factor, the kurtosis parameter, and the orbital angular mo- mentum density of a hollow vortex Gaussian beam passing through a paraxial ABCd optical system are also derived, respec- tively. The beam propagation factor is determined by the beam order and the topological charge. The kurtosis parameter and the orbital angular momentum density depend on beam order n, topological charge m, parameter y, and transfer matrix ele- ments A and d. As a numerical example, the propagation properties of a hollow vortex Gaussian beam in free space are demonstrated. The hollow vortex Gaussian beam has eminent propagation stability and has crucial application prospects in op- tical micromanipulation.

关键词： hollow vortex Gaussian beam beam propagation factor kurtosis parameter orbital angular momentum density

Noether symmetries of the nonconservative and nonholonomic systems on time scales

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Science China(Physics,Mechanics & Astronomy) 2013年第5期56卷 1017-1028页

作者： cai PingPing FU JingLi GUO YongXin Institute of Mathematical Physics Zhejiang Sci-Tech University department of Physics Liaoning University

In this paper we give a new method to investigate Noether symmetries and conservation laws of nonconservative and nonholonomic mechanical systems on time scales , which unifies the Noether's theories of the two cases for the continuous and the discrete nonconservative and nonholonomic systems. Firstly, the exchanging relationships between the isochronous variation and the delta derivatives as well as the relationships between the isochronous variation and the total variation on time scales are obtained. Secondly, using the exchanging relationships, the Hamilton's principle is presented for nonconservative systems with delta derivatives and then the Lagrange equations of the systems are obtained. Thirdly, based on the quasi-invariance of Hamiltonian action of the systems under the infinitesimal transformations with respect to the time and generalized coordinates, the Noether's theorem and the conservation laws for nonconservative systems on time scales are given. Fourthly, the d'Alembert-Lagrange principle with delta derivatives is presented, and the Lagrange equations of nonholonomic systems with delta derivatives are obtained. In addition, the Noether's theorems and the conservation laws for nonholonomic systems on time scales are also obtained. Lastly, we present a new version of Noether's theorems for discrete systems. Several examples are given to illustrate the application of our results.

关键词： time scale Lagrange equation delta derivative Noether's theorem nonconservative and nonholonomic system

耐力训练大鼠抗动脉粥样硬化线粒体自噬通路中抗增殖蛋白2的作用

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中国组织工程研究 2025年第11期29卷 2294-2300页

作者：宋明箫陈君顺子王宁伟蔡欢冯红天津体育学院运动健康学院天津市301617 贵阳学院体育学院贵州省贵阳市550005

背景:运动可降低血脂,减缓动脉粥样硬化发展。动脉粥样硬化起始于线粒体功能障碍,而抗增殖蛋白2蛋白受耐力训练调控,参与线粒体自噬。目的:验证耐力训练干预动脉粥样硬化中抗增殖蛋白2蛋白在线粒体自噬通路中的作用。方法:将40只Wistar... 详细信息

背景:运动可降低血脂,减缓动脉粥样硬化发展。动脉粥样硬化起始于线粒体功能障碍,而抗增殖蛋白2蛋白受耐力训练调控,参与线粒体自噬。目的:验证耐力训练干预动脉粥样硬化中抗增殖蛋白2蛋白在线粒体自噬通路中的作用。方法:将40只Wistar大鼠随机分为对照组、运动组、动脉粥样硬化组和动脉粥样硬化运动组,每组10只,后2组大鼠高脂饮食(9周)联合维生素d注射(第1,3,6周)构建大鼠动脉粥样硬化模型,同时2个运动组大鼠进行跑台递增训练干预9周。干预结束后进行血脂和病理检测观察造模及干预效果;酶标法和Western blot检测线粒体膜电位和自噬相关蛋白表达;免疫荧光观察主动脉中线粒体自噬蛋白的共定位情况。结果与结论:(1)血脂和病理切片显示,与动脉粥样硬化组相比,动脉粥样硬化运动组大鼠血清低密度脂蛋白胆固醇、总胆固醇水平和主动脉脂质沉积面积显著降低(P<0.001)。(2)线粒体膜电位显示,动脉粥样硬化运动组大鼠主动脉线粒体膜电位的显著降低得到逆转(P<0.01)。(3)Western blot显示,与对照组相比,动脉粥样硬化组大鼠线粒体抗增殖蛋白2、LC3Ⅱ/Ⅰ、PINK1和Parkin蛋白表达显著升高(P<0.05),PARL和PGAM5蛋白表达降低(P<0.05);与动脉粥样硬化组相比,动脉粥样硬化运动组大鼠线粒体PINK1和Parkin蛋白表达显著降低(P<0.05),抗增殖蛋白2、LC3Ⅱ/Ⅰ、PARL和PGAM5蛋白表达显著升高(P<0.05)。(4)免疫荧光结果显示,动脉粥样硬化组较对照组LC3和PINK1与TOMM20共定位显著增加(P<0.05),动脉粥样硬化运动组较动脉粥样硬化组LC3与TOMM20共定位显著增加(P<0.05);动脉粥样硬化组较对照组LC3和PARL与抗增殖蛋白2共定位显著增加(P<0.01),动脉粥样硬化运动组较动脉粥样硬化组LC3与抗增殖蛋白2共定位显著增加(P<0.01),PARL蛋白与抗增殖蛋白2共定位显著降低(P<0.01)。(5)结果表明,耐力训练可诱导线粒体内膜自噬受体抗增殖蛋白2表达,促进抗增殖蛋白2与线粒体自噬接头蛋白的结合完成线粒体自噬,恢复线粒体功能,减缓动脉粥样硬化发生。

关键词：抗增殖蛋白2 耐力训练线粒体自噬动脉粥样硬化线粒体