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Noise-Induced Entanglement Transition in One-Dimensional Random Quantum Circuits

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Chinese Physics Letters 2022年第5期39卷 10-15页

作者： Qi zhang guang-Ming zhang State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijing 100084China Frontier Science Center for Quantum Information Beijing 100084China

A random quantum circuit is a minimally structured model to study entanglement dynamics of many-body quantum *** consider a one-dimensional quantum circuit with noisy Haar-random unitary gates using density matrix operator and tensor contraction *** is shown that the entanglement evolution of the random quantum circuits is properly characterized by the logarithmic entanglement *** performing exact numerical calculations,we find that,as the physical error rate is decreased below a critical value p;≈0.056,the logarithmic entanglement negativity changes from the area law to the volume law,giving rise to an entanglement *** critical exponent of the correlation length can be determined from the finite-size scaling analysis,revealing the universal dynamic property of the noisy intermediate-scale quantum devices.

关键词： transition quantum Transition

In situ Investigation on Layer-by-Layer Deposition of Polyelectrolytes by Quartz Crystal Microbalance

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Chinese Journal of Chemical Physics 2008年第3期21卷 291-294页

作者： Yun-fengYan guang-ming Liu Ye-cang Tang guang-zhao zhang Department of Chemical Physics University of Science and Technology of China Hefei 230025 China

The effect of salt concentration on layer-by-layer deposition of poly（sodium 4-styrene sulfonate）（PSSS）/poly（vinylbenzyl trimethylammonium chloride）（PVTC） was investigated by use of quartz crystal microbalance with dissipation （QCM-D）. The changes in frequency and dissipation demonstrate that the addition of NaC1 leads the thickness of PSSS/PVTC multilayer to increase. The deposition of PSSS/PVTC is dominated by surface charge overcompensation level at lower salt concentrations. However, it is mainly determined by the interpenetration of polyelectrolytes at a higher salt concentration, as reflected in the oscillation of dissipation change.

关键词： Polyelectrolyte Layer-by-layer deposition Quartz crystal microbalance

Essential Players in Cooperative Games with Graph Communication Structure

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Journal of the Operations Research Society of China 2024年第1期12卷 93-108页

作者： guang zhang Jing-Yi Ge Business School University of Shanghai for Science and TechnologyShanghai200093China

A class of cooperative games with graph communication structure is studied in this paper by considering some important players,namely essential *** the assumption that only connected coalitions containing essential players are able to cooperate and obtain their worths,the class of graph games with essential players is proposed as well as an allocation *** proposed value follows the spirit of the Myerson value defined by applying the Shapley value on a modified *** properties,feasible component efficiency,the inessential component property,and fairness,are provided to fully characterize this value,where feasible component efficiency and fairness follows the same ideas of component efficiency and fairness for classical graph games,and the inessential component property says that the total payoffs of the players in a non-feasible component is ***,some computational aspects of the proposed value and comparisons with disjunctive permission value for games with permission structure are also studied,respectively.

关键词： Cooperative game Graph structure Essential player Myerson value Computation Permission structure

Modulation of Self-healing of Polyion Complex Hydrogel by Ion-specific Effects

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Chinese Journal of Chemical Physics 2016年第6期29卷 725-728,I0002页

作者： Hui-li Liu guang-ming Liu guang-zhao zhang DepartmentofChemicalPhysics HefeiNationalLaboratoryforPhysicalSciencesattheMicroscaleUniversityofScienceandTechnologyofChinaHefei230026China FacultyofMaterialsScienceandEngineering SouthChinaUniversityofTechnologyGuangzhou510640China

We have prepared polyion complex （PIC） hydrogel consisting of poly（3-（methacryloylami no）propyl-trimethylamonium chloride） and poly（sodium p-styrenesulfonate） polyelectrolytes via a two-step polymerization procedure and have investigated specific ion effects on the self- healing of the PIC hydrogel. Our study demonstrates that the mechanical properties of the PIC hydrogel are strongly dependent on the type of the ions doped in the hydrogel. The ion-specific effects can be used to modulate the self-healing efficiency of the PIC hydrogel. As the doped anions change from kosmotrops to chaotropes, the self-healing efficiency of the PIC hydrogel increases. A more chaotropic anion has a stronger ability to break the ionic bonds formed within the hydrogel, leading to a higher efficiency during the healing.

关键词： Polyelectrolyte hydrogel Self-healing Ion-specific effects Mechanical property Counterions

A Self-Excitation Double Pathway Relaxation Oscillational Model of Rare-Earth-Doped Laser

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Chinese Physics Letters 1996年第4期13卷 281-284页

作者： WANG Zhong-he zhang guang-yin Department of Physics Nankai UniversityTianjin 300071

A self-excitation double pathway relaxation oscillation mechanism to deal with the seif-pulsing output of up conversion laser with rare-earth ions as the active material is *** reabsorption of the laser signal,which causes self-excitation of system and two-pathway transition of systepi,plays a role of adjusting Q,and causes the oscillation output of laser.A qualitative analysis to the appearance of self-pulsing output of rare-earth-doped laser is given.

关键词： oscillation excitation rare

A superarmoured lobopodian from the Cambrian Stage 4 of southern China

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Science Bulletin 2016年第17期61卷 1372-1376页

作者： De-guang Jiao Jie Yang Xi-guang zhang Key Laboratory for Palaeobiology Yunnan University Kunming 650091 China Yunnan Vocational College of Land and Resources Kunming 650217 China

A superarmoured lobopodian Collinsium *** the Cambrian(Stage 4) Wulongqing Formation in Kunming clearly exhibits dorsal sets of sclerotized spines,suspension feeding appendages with spiniform setae,and annulated walking limbs with a terminal *** distinctive body configuration reinforces the remarkable appendage specialization associated with feeding and locomotion and overall morphological disparity in lobopodians during the Cambrian *** finding extends the geographic and stratigraphic ranges of "Collins' monster"-like lobopodians,and provides additional information for a better understanding of the cryptic stemgroup Onychophora.

关键词： Lobopodians Body architecture Functional morphology Cambrian Stage 4 Onychophora Evolution

Influence of Lamellar Direction in Pearlitic Steel Wire on Mechanical Properties and Microstructure Evolution

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Journal of Iron and Steel Research International 2016年第12期23卷 1290-1296页

作者： Tian zhang ZHAO guang-liang zhang Shi hong zhang Ling-yun zhang Key Laboratory of Fundamental Science for National Defence of Aeronautical Digital Manufacturing Process Shenyang Aerospace UniversityShenyang 110016LiaoningChina School of Mechanical Engineering Taizhou UniversityTaizhou 318000ZhejiangChina Institute of Metal Research Chinese Academy of SciencesShenyang 110016LiaoningChina

During cold drawing of pearlitic steel wire, the lamellar structure becomes gradually aligned with the draw ing axis, which contributes to the ultra high strength. A direct simulation about the mechanical behaviors and microstructural evolution of pearlitic lamellae was presented. A representative volume element （RVE） containing one pearlitic colony was established based on the real transmission electron microscope （TEM） observation. The deformation of pearlitic colony during tension, shear and wire drawing were successfully simulated. The numerical results show that this metallographic texture leads to a strong anisotropy. The colony has higher yielding stress when the la mellar direction is parallel and perpendicular to the tensile direction. The lamellar evolution is strongly dependent on the initial direction and deformation mode. The formation of typical period shear bands is analyzed. In the wire draw ing, the pearlitic colony at the sub surface experiences a complex strain path： rotation, stretching along the die sur face, and rotation back.

关键词： pearlitic lamellae steel wire drawing mechanical property representative volume element

Enhancing high-temperature tensile properties of Ni/Ni-W laminated composites for MEMS devices

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Journal of Materials Science & Technology 2023年第7期138卷 129-137页

作者： Zhe-Xuan Wang Fei Liang guang-Ping zhang Bin zhang Key Laboratory for Anisotropy and Texture of Materials Ministry of EducationSchool of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

There is an increasing demand for materials with excellent mechanical performance for Micro-Electro-Mechanical System(MEMS)devices serving at elevated ***,how to enhance the high-temperature strength of the materials without losing their plasticity is a pending ***,the Ni/Ni-W laminated composites with different monolayer thicknesses and the same ratio of the constituent layer thicknesses were fabricated successfully by using the dual-bath electrodeposition *** microstructure stability and tensile properties of annealed Ni/Ni-W laminated composites with different monolayer thicknesses were investigated at 400℃.The results show that the annealed Ni0.5/Ni-W0.05 laminated composites have both high yield strength(450 MPa)and excellent elongation to failure(25.1%)at 400℃,being superior to that of the monotonic Ni(179 MPa and 17.7%).Such a high strength of the laminated composite at 400℃ results from the contribution of the intrinsically high strength of the Ni-W layers with excellent thermal stability,the thickness-constrained effect on grain growth of Ni layers and the interface coupling effect of heterogeneous *** good plasticity may be derived from the heterogeneous laminated structure and the decrease in the constituent layer thickness,providing a good co-deformation *** mechanisms for the high tensile strength and good plasticity of the Ni/Ni-W laminated composites at 400℃ were analyzed *** findings reveal a potential strategy to fabricate MEMS components with excellent high-temperature tensile properties through tailoring the microstructure thermal stability and the constituent layer scale.

关键词： Laminated composites MEMS Strength Plasticity High temperature

Mitochondrial transplantation as a promising therapy for mitochondrial diseases

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Acta Pharmaceutica Sinica B 2023年第3期13卷 1028-1035页

作者： Tian-guang zhang Chao-yu Miao Department of Pharmacology Second Military Medical University/Naval Medical UniversityShanghai 200433China

Mitochondrial diseases are a group of inherited or acquired metabolic disorders caused by mitochondrial dysfunction which may affect almost all the organs in the body and present at any ***,no satisfactory therapeutic strategies have been available for mitochondrial diseases so *** transplantation is a burgeoning approach for treatment of mitochondrial diseases by recovery of dysfunctional mitochondria in defective cells using isolated functional *** models of mitochondrial transplantation in cells,animals,and patients have proved effective via various routes of mitochondrial *** review presents different techniques used in mitochondrial isolation and delivery,mechanisms of mitochondrial internalization and consequences of mitochondrial transplantation,along with challenges for clinical *** some unknowns and challenges,mitochondrial transplantation would provide an innovative approach for mitochondrial medicine.

关键词： Mitochondria Mitochondrial transplantation Mitochondrial disease Mitochondrial isolation Mitochondrial delivery Mitochondrial storage Mitochondrial transplantation rejection Ethical issue