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Multiple bifurcations and local energy minimizers in thermoelastic martensitic transformations

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Acta Mechanica Sinica 2015年第5期31卷 660-671页

作者： Chen Xuan Shurong Ding Yongzhong huo Department of Mechanics and Engineering Science Fudan University

Thermoelastic martensitic transformations in shape memory alloys can be modeled on the basis of nonlinear elastic *** of fine phase mixtures are local energy minimizers of the total *** a one-dimensional effective model,we have shown that such microstructures are inhomogeneous solutions of the nonlinear Euler-Lagrange equation and can appear upon loading or unloading to certain critical conditions,the bifurcation conditions.A hybrid numerical method is utilized to calculate the inhomogeneous solutions with a large number of *** characteristics of the solutions are clarified by three parameters：the number of interfaces,the interface thickness,and the oscillating *** analytical expressions are obtained for the interface and inhomogeneity energies through the numerical solutions.

关键词： Thermoelastic martensitic transformation Microstructures Nonlinear elasticity Bifurcation Energy minimizer

Multi-stride Indexing: Improve NFA for Fast and Scalable DPI

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Chinese Journal of Electronics 2018年第1期27卷 86-92页

作者： huo Sheng ZHANG Dafang LI Yanbiao College of Information Science and Engineering Hunan University

Regular expression matching is one of the key techniques for Deep packet inspection(DPI). Generally, the Deterministic finite automata(DFA) can process regular expression matching at a very high rate but memory inefficient. By contrast, the Non-deterministic finite automata(NFA) improves the memory efficiency significantly, at the cost of low speed. To meet the increasing demands on both throughput and memory scalability, we propose a novel schema to achieve fast regular expression with reasonable and controllable memory consumption. According to observations on matching real traffic, we design a Multi-Stride Indexing(MSI) table and divide each matching into two steps, toward the MSI table and the NFA respectively. the MSI table consumes a small fixed amount of on-chip memories(it is about 20 KB for 2 stride level MSI table). After the most of unnecessary matching was eliminated via MSI table, we implement the fast-speed regular expression matching with NFA.

关键词： Regular expression matching Deep packet inspection(DPI) Non-deterministic finite automata(NFA) Multi-stride

Effect of stoichiometry and Cu-substitution on the phase structure and hydrogen storage properties of Ml-Mg-Ni-based alloys

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International Journal of Minerals,Metallurgy and Materials 2015年第1期22卷 86-93页

作者： Yuan Li Yang Tao Quan huo Hebei Key Laboratory of Applied Chemistry School of Environmental and Chemical EngineeringYanshan University

To improve the electrochemical properties of rare-earth-Mg-Ni-based hydrogen storage alloys, the effects of stoichiometry and Cu-substitution on the phase structure and thermodynamic properties of the alloys were studied. Nonsubstituted Ml0.80Mg0.20（Ni2.90Co0.50-Mn0.30Al0.30）x （x=0.68, 0.70, 0.72, 0.74, 0.76） alloys and Cu-substituted Ml0.80Mg0.20（Ni2.90Co0.50-yCuyMn0.30Al0.30）0.70 （y=0, 0.10, 0.30, 0.50） alloys were prepared by induction melting. Phase structure analysis shows that the nonsubstituted alloys consist of a LaNi5 phase, a LaNi3 phase, and a minor La2Ni7 phase;in addition, in the case of Cu-substitution, the Nd2Ni7 phase appears and the LaNi3 phase vanishes. Ther-modynamic tests show that the enthalpy change in the dehydriding process decreases, indicating that hydride stability decreases with in-creasing stoichiometry and increasing Cu content. The maximum discharge capacity, kinetic properties, and cycling stability of the alloy electrodes all increase and then decrease with increasing stoichiometry or increasing Cu content. Furthermore, Cu substitution for Co ame-liorates the discharge capacity, kinetics, and cycling stability of the alloy electrodes.

关键词： hydrogen storage alloys electrode materials stoichiometry substitution phase structure thermodynamic properties electro-chemical properties

Dynamical behavior and optimal impulse control analysis of a stochastic rumor spreading model

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Chinese Physics B 2022年第11期31卷 188-200页

作者： Liang’an huo Xiaomin Chen Business School University of Shanghai for Science and TechnologyShanghai 200093China

The Internet era has brought great convenience to our life and ***,it also makes a bunch of rumors propagate faster and causes even more harm to human ***,it is necessary to perform effective control mechanisms to minimize the negative social impact from ***,firstly,we formulate a rumor spreading model considering psychological factors and thinking time,then,we add white noise(i.e.,stochastic interference)and two pulse control strategies which denote education mechanism and refutation mechanism into the ***,we obtain the global positive solutions and demonstrate the global exponential stability of the unique positive periodic rumor-free ***,we discuss the extinction and persistence of ***,we use Pontriagin’s minimum principle to explore the optimal impulse ***,several numerical simulations are carried out to verify the effectiveness and availability of the theoretical *** conclude that the pulse control strategies have a great influence on controlling rumor spreading,and different control strategies should be adopted under different transmission scenarios.

关键词： rumor spreading stochastic process optimal impulse control education mechanism refutation mechanism

Complex Semblance and Its Application

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Journal of Earth Science 2019年第4期30卷 849-852页

作者： Taikun Shi Shoudong huo Key Laboratory of Petroleum Resources Research Institute of Geology and Geophysics Chinese Academy of Sciences

Semblance,a measure of multi-trace coherence,has been used extensively in seismic data processing and interpretation such as velocity analysis and fault detection. The traditional algorithm has a difficulty at zero-crossings of seismic recordings. This problem is alleviated by applying a smoothing window at the cost of losing vertical resolutions. In this paper,we improve the algorithm by computing semblance from complex traces. Our initial results show that the complex semblance is smooth at zero-crossings. Because the smoothing time window becomes unnecessary,the higher vertical resolution can be achieved by using small windows or none. Some geological features,like faults and unconformities,appear clearer and easier to identify with the complex semblance. As the advantages are obvious and the implementation is straight-forward with the Hilbert transform,this new algorithm may replace the traditional one in future applications.

关键词： semblance complex trace Hilbert transform velocity analysis fault detection

Angstrom science:Exploring aggregates from a new viewpoint

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Green Energy & Environment 2016年第1期1卷 75-78页

作者： Suojiang Zhang Feng huo Beijing Key Laboratory of Ionic Liquids Clean Process State Key Laboratory of Multiphase Complex SystemInstitute of Process EngineeringChinese Academy of Sciences

A small aggregate is composed of several or tens of molecules or ions, with at least one dimension in the range from a few to dozens of angstroms. Here, we named such aggregate system as Angstrom Aggregates(AA). AA with the specific size in angstrom meter might possess unique structure activity relationship. Unlike molecular level, nano system and the bulk, AA, an aggregate in angstrom scale is firstly proposed,its arrangement in order, electronic effect, surface interaction, confinement effect, is still unclear. However, recently, the structure and activity relationship of such aggregate in angstrom scale has attracted increasing interest in many areas, such as in ionic liquids, aqueous solution,catalytic system, and bio-system. As the physical and chemical propeties of AA strongly depends on its structure, the in situ characterizzation technique combined with theoretical methods should be developed to understand the exact interaction between the component of the clusters, the assembly formations, the special features, and the reaction activities. It has great scientific meaning to detect, represent and regulate the structure and function of AA precisely, facilitating in its application. A systematic and thorough research on AA in angstrom scale will promote the development of fundamental science and the progress of technology significantly.

关键词： Angstom science Aggregates Aqueous system Bio-system Ionic liquids

On Marcinkiewicz Integrals Associated to Compound Mappings with Rough Kernels

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Acta Mathematica Sinica,English Series 2014年第7期30卷 1210-1230页

作者： Feng LIU huo Xiong WU School of Mathematical Sciences Xiamen University

The Lp bounds for the parametric Marcinkiewicz integrals associated to compound mapq pings, which contain many classical surfaces as model examples, are given, where the kernels of our operators are rather rough on the unit sphere as well as in the radial direction. These results substan- tially improve and extend some known results.

关键词： Marcinkiewicz integrals compound mappings rough kernels Fourier transform estimates,extrapolation

Early reperfusion strategy for acute myocardial infarction:a need for clinical implementation

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2011年第8期12卷 629-632页

作者： Yan ZHANG Yong huo Department of Cardiology Peking University First HospitalBeijing 100034 China

Reperfusion is the key strategy in acute ST-segment elevation myocardial infarction (STEMI) care,and it is *** the time from symptom to reperfusion and choosing the optimal reperfusion strategy for STEMI patients are great challenges in *** need to improve upon the problems of low reperfusion rate,non-standardized treatment,and economic burden in STEMI *** article briefly reviews the current status of reperfusion strategy in STEMI care,and also introduces what we will do to bridge the gap between the guidelines and implementation in the clinical setting through the upcoming China STEMI early reperfusion program.

关键词： Acute ST-segment elevation myocardialinfarction (STEMI) Reperfusion Percutaneous coronaryintervention (PCI) Fibrinolysis

Nuclear magnetic resonance studies of organic-inorganic composite solid electrolytes

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Magnetic Resonance Letters 2021年第2期1卷 142-152页

作者： Xueyan Zhang Hua huo MIIT Key Laboratory of Cnitical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chermical EngineeringHarbin Institute of TechnologyNo.92 West Da Zhi StreetHarbin150001China

Solid electrolytes have received widespread attention due to their higher safety than liquid electrolytes in the past *** particular,organic-inorganic composite solid electro-lytes(CSEs)in which inorganic fllers dispersed in polymer solid electrolytes are consid-ered to be one of the most promising candidate electrolytes for high-performance solid-state lithium *** the local environments and the conduction pathway/dynamics of Lit is essential for the design of high-performance *** magnetic resonance(NMR)is a non-invasive quantitative technique that has unique ca-pabilities in providing molecular structure information,morphological evolution,and measuring the movement of ions at different time ***,for battery re-searchers,an accurate and comprehensive under standing of the basic principles and experimental design of solid-state NMR(SSNMR)is of great significance for investigating the abundant molecular structure and dynamics information in *** specific appli-cations of the SSNMR technique in CSEs are briefly introduced in this present review.

关键词： Composite solid electrolytes(CSEs) Conduction pathway Solid-state NMR(SSNMR) Solid-state lithium batteries