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The low Mach number limit of non-isentropic magnetohydrodynamic equations with large temperature variations in bounded domains

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Science China Mathematics 2024年第4期67卷 787-818页

作者： min liang Yaobin Ou School of Mathematics Renmin University of ChinaBeijing 100872China

This paper verifies the low Mach number limit of the non-isentropic compressible magnetohydrodynamic(MHD)equations with or without the magnetic diffusion in a three-dimensional bounded domain when the temperature variation is large but *** uniform estimates of strong solutions are established in a short time interval independent of the Mach number,provided that the slip boundary condition for the velocity and the Neumann boundary condition for the temperature are imposed and the initial data is well-prepared.

关键词： low Mach number limit non-isentropic compressible magnetohydrodynamic equations large temperature variations bounded domains

Universal quantum circuit of near-trivial transformations

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Science China(Physics,Mechanics & Astronomy) 2011年第10期54卷 1819-1827页

作者： liang min YANG Li State Key Laboratory of Information Security Graduate University of Chinese Academy of Sciences Beijing 100049 China

Any unitary transformation can be decomposed into a product of a group of near-trivial transformations. We investigate in detail theconstruction of universal quantum circuit of near trivial transformations. We first construct two universal quantum circuits whichcan implement any single-qubit rotation Ry(θ) and Rz(θ) within any given precision, and then we construct universal quantum circuitimplementing any single-qubit transformation within any given precision. Finally, a universal quantum circuit implementing anyn-qubit near-trivial transformation is constructed using the universal quantum circuits of Ry(θ) and Rz(θ). In the universal quantumcircuit presented, each quantum transformation is encoded to a bit string which is used as ancillary inputs. The output of the circuitconsists of the related bit string and the result of near-trivial transformation. Our result may be useful for the design of universalquantum computer in the future.

关键词： quantum computation quantum circuit universal quantum circuit near-trivial transformation

Public-key encryption and authentication of quantum information

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Science China(Physics,Mechanics & Astronomy) 2012年第9期55卷 1618-1629页

作者： liang min YANG Li State Key Laboratory oflnformation Security Institute of Information Engineering Chinese Academy of Sciences Beijing 100195 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

Public-key cryptosystems for quantum messages are considered from two aspects:public-key encryption and public-key ***,we propose a general construction of quantum public-key encryption scheme,and then construct an informationtheoretic secure ***,we propose a quantum public-key authentication scheme,which can protect the integrity of quantum *** scheme can both encrypt and authenticate quantum *** is information-theoretic secure with regard to encryption,and the success probability of tampering decreases exponentially with the security parameter with regard to *** with classical public-key cryptosystems,one private-key in our schemes corresponds to an exponential number of public-keys,and every quantum public-key used by the sender is an unknown quantum state to the sender.

关键词： quantum cryptography authentication quantum public-key private quantum channel

Ligand-controlled NiH-catalyzed regiodivergent hydroalkylation of 2-alkenylazaarenes

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Science China Chemistry 2024年第6期67卷 1935-1940页

作者： Ya-Ping Shao Zhuo-min Chi Yong-min liang State Key Laboratory of Applied Organic Chemistry School of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou730000China

A nickel-hydride(Ni H)-catalyzed migratory and nonmigratory hydroalkylation reaction of 2-alkenyl azaarenes with alkyl iodines has been established through strategic modulation of N-or P-donor *** method enables the synthesis of diverseβ-orγ-branched aromatic *** mild regiodivergent protocols exhibit wide substrate scope,excellent functional tolerance,and great reaction yield with remarkable ***,deuterium labeling studies reveal Ni H-catalyzed interrupted chain-walking mode as the mechanism behind remotedβ-selective hydroalkylation reaction—an interesting phenomenon mediated through aromatic imine directing groups.

关键词： NiH regiodivergent hydroalkylation azaarenes interrupted chain-walking

Experimentation of Fish Swimming Based on Tracking Locomotion Locus

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Journal of Bionic Engineering 2008年第3期5卷 258-263页

作者： Hui Yan Yu-min Su liang Yang Laboratory of Underwater Vehicle Harbin Engineering University Harbin 150001 P. R. China

There are many kinds of swimming mode in the fish world, and we investigated two of them, used by cyprinids and bulltrout. In this paper we track the locomotion locus by marks in different flow velocity from 0.2 m·s^-1 to 0.8 m·s^-1. By fit the data above we could find out the locomotion mechanism of the two kinds of fish and generate a mathematical model of fish kine- matics. The cyprinid fish has a greater oscillation period and amplitude compared with the bulltrout, and the bulltrout changes velocity mainly by controlling frequency of oscillation.

关键词： aquatic bionics bionic propulsion fish swimming analysis of locomotion tracking locus

A New Triterpenoid Saponin from Codonopsis lanceolata

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Chinese Chemical Letters 2006年第11期17卷 1460-1462页

作者： Zhong YUAN Zhi min liang School of Traditional Chinese Materia Medica Shenyang Pharmaceutical University Shenyang 110016

A new triterpenoid saponin, named codonolaside （1） was isolated from the root of Codonopsis lanceolata. Its structure was determined by analysis of its spectral and chemical data.

关键词： Codonopsis lanceolata triterpenoid saponin codonolaside.

Synthesis and Crystal Structure of One-dimensional Cadmium(II) Coordination Polymer: [Cd_2(DTB)(Bpy)_2(H_2O)_2]n (DTB = 1,4-Dinitro-2,3,5,6-tetracarboxylatebenzene Tetravalent Anion; Bpy = 2,2'-Bipyridyl)

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Chinese Journal of Structural Chemistry 2004年第11期23卷 1266-1268页

作者： SHIJing-min YINHai-liang ZHANGXia WUChang-Ju DepartmentofChemistry ShandongNormalUniversityJinan250014China

A one-dimensional coordination polymer [Cd2(DTB)(Bpy)2(H2O)2]n was synthe- sized by the reaction of hydrate cadmium perchlorate with 1,4-dinitro-2,3,5,6-tetracarboxylateben- zenic acid, sodium hydroxide and 2,2?-bipyridyl in 50% methanol solution by using solvent-thermal method. The crystal belongs to the triclinic system, space group P1 with a = 8.137(3), b = 9.527(3), c = 10.737(4) ?, α = 96.305(6), β = 102.996(5), γ = 101.511(6)°, Z = 1, C30H20Cd2N6O14, Mr = 913.32, Dc = 1.934 g/cm3, V = 784.2(5) ?3, F(000) = 450 and μ = 1.440 mm-1. The structure was refined to R = 0.0497 and wR = 0.0955 for 1870 observed reflections (I > 2σ(I)). In the complex each DTB as a four-dentate ligand bridges four cadmium(II) ions to form a one-dimensional chain structure.

关键词： synthesis crystal structure cadmium complex

Quantum gradient descent algorithms for nonequilibrium steady states and linear algebraic systems

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Science China(Physics,Mechanics & Astronomy) 2022年第5期65卷 21-33页

作者： Jin-min liang Shi-Jie Wei Shao-ming Fei School of Mathematical Sciences Capital Normal UniversityBeijing J00048China Beijing Academy of Quantum Information Sciences Beijing 100193China State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijing 100084China Shenzhen Institute for Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China

The gradient descent approach is the key ingredient in variational quantum algorithms and machine learning tasks,which is an optimization algorithm for finding a local minimum of an objective *** quantum versions of gradient descent have been investigated and implemented in calculating molecular ground states and optimizing polynomial *** on the quantum gradient descent algorithm and Choi-Jamiolkowski isomorphism,we present approaches to simulate efficiently the nonequilibrium steady states of Markovian open quantum many-body *** strategies are developed to evaluate the expectation values of physical observables on the nonequilibrium steady ***,we adapt the quantum gradient descent algorithm to solve linear algebra problems including linear systems of equations and matrix-vector multiplications,by converting these algebraic problems into the simulations of closed quantum systems with well-defined *** examples are given to test numerically the effectiveness of the proposed algorithms for the dissipative quantum transverse Ising models and matrix-vector multiplications.

关键词： quantum simulation quantum gradient descent algorithm nonequilibrium steady state quantum open system

Synthesis and Bacteriostatic Activity and Antifouling Capability of Benzamide Derivatives Containing Capsaicin

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Chemical Research in Chinese Universities 2011年第5期27卷 803-807页

作者： CONG Wei-wei YU liang-min Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education Ocean University of China Qingdao 266100 P. R. China

Five benzamide deriatives containing capsaicin were synthesized which have similar structures to capsaicin. Their yield was high. The monomers synthesized were characterized by IR, 1H NMR and MS spectroscopy. Cha-racterization data are in agreement with the proposed structures of the products. These five compounds exhibit bacterial inhibition and N-[4-hydroxy-2-methyl-5-（methylthio）benzyl]benzamide（HMMBBA）, for instance, shows that the minimal inhibitory concentrations（MIC） of HMMBBA are 0.125 and 0.25 mg/mL on Staphyloccocus aureus and Escherichia coli, respectively. A static test site was set up in the eighth harbor to investigate the antifouling effectiveness of the five new antifoulants. Five-month exposure experiments were performed on sets of panels coated with each of antifouling coatings, and the results were compared to that of the test panel without antifouling coating. Test boards with antifouling coating were covered with just a macroscopic fouling organism such as Balanus. The results of the present paper demonstrate that new antifoulants represent an alternative to the biocidal antifouling paint.

关键词： Benzamide derivative containing capsaicin Bacterium-inhibition Antifoulant property