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The 3D Non-isentropic Compressible Euler Equations with Damping in a Bounded Domain

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Chinese Annals of Mathematics,Series B 2016年第6期37卷 915-928页

作者： yinghui zhang Guochun WU Department of Mathematics Hunan Institute of Science and Technology Academy of Mathematics and Systems Science Chinese Academy of Sciences

The authors investigate the global existence and asymptotic behavior of classical solutions to the 3D non-isentropic compressible Euler equations with damping on a bounded domain with slip boundary condition. The global existence and uniqueness of classical solutions are obtained when the initial data are near an equilibrium. Furthermore,the exponential convergence rates of the pressure and velocity are also proved by delicate energy methods.

关键词： Non-isentropic Euler equations Damping Exponential convergence

Global existence and time decay rates for the 3D bipolar compressible Navier-Stokes-Poisson system with unequal viscosities

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Science China Mathematics 2022年第4期65卷 731-752页

作者： Guochun Wu yinghui zhang Anzhen zhang School of Mathematical Sciences Huaqiao UniversityQuanzhou362021China School of Mathematics and Statistics Guangxi Normal UniversityGuilin541004China

We consider the Cauchy problem for the three-dimensional bipolar compressible Navier-Stokes-Poisson system with unequal *** the assumption that the H_(3) norm of the initial data is small but its higher order derivatives can be arbitrarily large,the global existence and uniqueness of smooth solutions are obtained by an ingenious energy ***,if additionally,the H^(−s)(1/2≤s<3/2)or B^(−s)_(2,∞)(1/2

关键词： bipolar Navier-Stokes-Poisson global existence optimal decay rates

Fine-grained cooperative access control scheme with hidden policies

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The Journal of China Universities of Posts and Telecommunications 2021年第6期28卷 13-25页

作者： Han Gang Xing Qixuan zhang yinghui School of Cyberspace Security Xi'an University of Posts and TelecommunicationsXi'an 710121China National Engineering Laboratory for Wireless Security Xi'an University of Posts and TelecommunicationsXi'an 710121China

The traditional ciphertext policy attribute-based encryption(CP-ABE) has two problems: one is that the access policy must be embedded in the ciphertext and sent, which leads to the disclosure of user's privacy information, the other is that it does not support collaborative decryption, which cannot meet the actual demand of conditional collaborative decryption among multiple users. In order to deal with the above two problems at the same time, a fine-grained cooperative access control scheme with hidden policies(FCAC-HP) is proposed based on the existing CP-ABE schemes combined with blockchain technology. In FCAC-HP scheme, users are grouped by group identifier so that only users within the same group can cooperate. In the data encryption stage, the access policy is encrypted and then embedded in the ciphertext to protect the privacy information of the access policy. In the data access stage, the anonymous attribute matching technology is introduced so that only matched users can decrypt ciphertext data to improve the efficiency of the system. In this process, a smart contract is used to execute the verification algorithm to ensure the credibility of the results. In terms of security, FCAC-HP scheme is based on the prime subgroup discriminative assumption and is proved to be indistinguishable under chosen plaintext attack(CPA) by dual system encryption technology. Experimental verification and analysis show that FCAC-HP scheme improves computational efficiency while implementing complex functions.

关键词： attribute-based encryption hidden policy group collaboration blockchain

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Phase transition in the subducted oceanic lithosphere and generation of the subduction zone magma

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Chinese Science Bulletin 2008年第23期53卷 3603-3614页

作者： WEI ChunJing zhang yinghui Key Laboratory of Orogenic Belts and Crustal Evolution Ministry of Education of China School of Earth and Space Sciences Pe-king University Beijing 100871 China

Two metamorphic processes, i.e. subsolidus dehydration and partial melting occurring in MORB, metasediments and peridotite of subducted oceanic lithosphere are discussed on the basis of available experimental work and phase equilibrium modeling. Phase diagrams of hydrous MORB show that in most cold subduction P-T (pressure-temperature) regimes a large portion of water in the basic layer has released below the onset of blueschist facies (< 20 km), and at a depth (60―70 km) of transition from lawsonite blueschist to lawsonite eclogite facies through glaucophane dehydration; only a smaller portion of water will escape from the slab through dehydration of lawsonite and chloritoid in the depth range suitable for arc magma formation; and a very small portion of water stored in lawsonite and phengite will fade into the deeper mantle. The role of amphibole for arc magma formation is still arguable. In cold subduction P-T regimes, the dehydration of chlorite and talc in Al-poor metasediments, and chloritoid and carpholite in Al-rich metapelites at a depth around 80―100 km will make some con- tributions to the formation of arc magma. Comparatively, dehydration of serpentine in hydrated peridotite occurs at depths of 120―180 km, playing an important role in the arc magmatism. Subduction of oceanic crust along warm P-T regimes will cross the solidi at a depth over 80 km, resulting in partial melting under fluid-saturated and fluid-absent conditions in the metasediments involving biotite and phengite, and in the basic rocks involving epidote and amphibole. The melt compositions of the basic crust are adakitic at pressures < 3.0 GPa, but become peraluminous granitic at higher pressures.

关键词：脱水作用部分熔融海洋岩石圈俯冲带

Global analysis of smooth solutions to a hyperbolic-parabolic coupled system

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Frontiers of Mathematics in China 2013年第6期8卷 1437-1460页

作者： yinghui zhang Haiying DENG Mingbao SUN Department of Mathematics Hunan Institute of Science and Technology Yueyang 414006 China School of Mathematics and Statistics Central China Normal University Wuhan 430079 China Department of Mathematics Hunan First Normal College Changsha 410205 China

We investigate a model arising from biology, which is a hyperbolic- parabolic coupled system. First, we prove the global existence and asymptotic behavior of smooth solutions to the Cauchy problem without any smallness assumption on the initial data. Second, if the Hs ∩ Ll-norm of initial data is sufficiently small, we also establish decay rates of the global smooth solutions. In particular, the optimal L2 decay rate of the solution and the almost optimal L2 decay rate of the first-order derivatives of the solution are obtained. These results are obtained by constructing a new nonnegative convex entropy and combining spectral analysis with energy methods.

关键词： Global analysis hyperbolic-parabolic system decay rate convex entropy

Singularity of the Extremal Solution for Supercritical Biharmonic Equations with Power-Type Nonlinearity

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Chinese Annals of Mathematics,Series B 2017年第3期38卷 815-826页

作者： Baishun LAI Zhengxiang YAN yinghui zhang Institute of Contemporary Mathematics Henan University Kaifeng 475004 Henan China. Xinyang Vocational and Technical College Xinyang 464000 Henan China. Department of Mathematics Hunan Institute of Science and Technology Yueyang 414006 HunanChina

Let B  R^n be the unit ball centered at the origin. The authors consider the following biharmonic equation:{?~2u = λ(1 + u)~p in B,u =?u/?ν= 0 on ?B, where p >n+4/ n-4and ν is the outward unit normal vector. It is well-known that there exists a λ*> 0 such that the biharmonic equation has a solution for λ∈ (0, λ*) and has a unique weak solution u*with parameter λ = λ*, called the extremal solution. It is proved that u* is singular when n ≥ 13 for p large enough and satisfies u*≤ r^(-4/ (p-1)) - 1 on the unit ball, which actually solve a part of the open problem left in [D`avila, J., Flores, I., Guerra, I., Multiplicity of solutions for a fourth order equation with power-type nonlinearity, Math. Ann., 348(1), 2009, 143–193] .

关键词： Minimal solutions Regularity Stability Fourth order

Modeling of gas-solid flow in a CFB riser based on computational particle fluid dynamics

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Petroleum Science 2012年第4期9卷 535-543页

作者： zhang yinghui Lan Xingying Gao Jinsen State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102249China

A three-dimensional model for gas-solid flow in a circulating fluidized bed（CFB） riser was developed based on computational particle fluid dynamics（CPFD）.The model was used to simulate the gas-solid flow behavior inside a circulating fluidized bed riser operating at various superficial gas velocities and solids mass fluxes in two fluidization regimes,a dilute phase transport（DPT） regime and a fast fluidization（FF） *** simulation results were evaluated based on comparison with experimental data of solids velocity and holdup,obtained from non-invasive automated radioactive particle tracking and gamma-ray tomography techniques,*** agreement of the predicted solids velocity and holdup with experimental data validated the CPFD model for the CFB *** model predicted the main features of the gas-solid flows in the two regimes;the uniform dilute phase in the DPT regime,and the coexistence of the dilute phase in the upper region and the dense phase in the lower region in the FF *** clustering and solids back mixing in the FF regime were stronger than those in the DPT regime.

关键词： Gas-solid flow circulating fluidized bed computational particle fluid dynamics modeling hydrodynamics

Reinterpretation of metamorphic age of the Hengshan Complex,North China Craton

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Chinese Science Bulletin 2013年第34期58卷 4300-4307页

作者： zhang yinghui WEI CunJing TIAN Wei ZHOU XiWen Key Laboratory of the Orogenic Belt and Crustal Evolution Ministry of Education School of Earth and Space Sciences Peking University Institute of Geology Chinese Academy of Geological Sciences

Hengshan granulite facies terrane consists of tonalite-trondhjemite-granodiorite(TTG)gneisses and minor high-pressure mafic granulite ***-ICP-MS zircon dating for two TTG gneiss samples indicates metamorphic ages of 1916.7±9.9 Ma and1850–1930 Ma,and magmatic protolith age of ca.2.5 Ga,with similar HREE-rich *** equilibria modelling in ZrO2-bearing system reveals that zircon abundance varies inversely with melt abundance in suprasolidus metamorphism,zircon growth occurs with melt crystallization during cooling,and thus,the newly grown zircon can only record the age of retrograde ***,we suggest that the Hengshan granulite facies terrane experienced slowly uplifting and cooling during 1.85–1.93 Ga in an extensional setting under middle-crust,while the collision orogeny corresponding to peak stage of high-pressure granulite may have happened much earlier.

关键词：变质年龄衡山中国北方克拉通 LA-ICP-MS 高压麻粒岩锆石定年解读

Mechanical properties and microstructure of TRIP steels produced using TSCR process

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Journal of University of Science and Technology Beijing 2006年第5期13卷 416-419页

作者： yinghui zhang Yanli Ma Yonglin Kang Hao Yu Materials Science and Engineering School University Science and Technology Beijing Beijing 100083 China Materials Science and Engineering School Jiangxi University of Science and Technology Ganzhou 341000 China Information Engineering Department Qingdao Binhai College Qingdao 266555 China

C-Si-Mn TRIP steels were produced using the thin slab casting and rolling （TSCR） process under simulation in laboratory. The results of tensile tests show that the yield strength, tensile strength, and the total elongation of the experimental TRIP steels are 430 MPa, 610 MPa, and 28.4%, respectively. Optical microscopy, scanning electron microscopy （SEM）, and transmission electron microscopy （TEM） were employed to identify the microstructures of the TRIP steels. The final microstructures consist of ferrite, bainite, and retained austenite. The results of quantitative color metallography show that the fraction of the retained austenite is about 5.8%.

关键词： C-Si-Mn TRIP steel TSCR mechanical properties microstructure