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ImSpiRE: image feature-aided spatial resolution enhancement method

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Science China Life Sciences 2025年第01期 272-283页

作者： Yuwei Hua Yizhi zhang Zhenming Guo Shan Bian yong zhang State Key Laboratory of Cardiovascular Diseases and Medical Innovation Center Institute for Regenerative MedicineDepartment of NeurosurgeryShanghai East HospitalShanghai Key Laboratory of Signaling and Disease ResearchFrontier Science Center for Stem Cell ResearchSchool of Life Sciences and TechnologyTongji University

The resolution of most spatially resolved transcriptomic technologies usually cannot attain the single-cell level, limiting their applications in biological discoveries. Here, we introduce ImSpiRE, an image feature-aided spatial resolution enhancement method for in situ capturing spatial transcriptome. Taking the information stored in histological images, ImSpiRE solves an optimal transport problem to redistribute the expression profiles of spots to construct new transcriptional profiles with enhanced resolution, together with extending the gene expression profiles into unmeasured regions. Applications to multiple datasets confirm that ImSpiRE can enhance spatial resolution to the subspot level while contributing to the discovery of tissue domains, signaling communication patterns, and spatiotemporal characterization.

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基于密度泛函理论研究Ag-Co团簇的结构、电子和光学性能

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原子与分子物理学报 2025年第2期42卷 63-69页

作者：李维银尚瑞咏王春勇张永莉北方民族大学电气信息工程学院物理与光电信息功能材料重点实验室微电子与固体电子器件研究中心银川750021

基于密度泛函理论研究了7个原子Ag-Co团簇结构的稳定性、电子和光学性能.研究结果表明,7个原子Ag-Co团簇的最稳定结构都是十面体结构,Co原子数量较少时,Co原子主要占据十面体的轴向位,Ag原子主要占据赤道位,随着Co原子数的增加,Co原子... 详细信息

基于密度泛函理论研究了7个原子Ag-Co团簇结构的稳定性、电子和光学性能.研究结果表明,7个原子Ag-Co团簇的最稳定结构都是十面体结构,Co原子数量较少时,Co原子主要占据十面体的轴向位,Ag原子主要占据赤道位,随着Co原子数的增加,Co原子逐渐替换了赤道位上的Ag原子.当Co原子数增加时,Ag-Co团簇的垂直电离势、垂直电子亲能和最高占据轨道与最低未占据轨道之间的能隙整体上都呈现出下降趋势,表明电子稳定性降低;Ag-Co团簇的吸收光谱整体出现了红移,吸收峰的强度逐渐减弱,吸收谱的宽度变窄.

关键词：银钴团簇几何结构电子性能光学性能

A Chaotic System Based Image Encryption Scheme with Identical Encryption and Decryption Algorithm

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Chinese Journal of Electronics 2017年第5期26卷 1022-1031页

作者： zhang yong School of Software and Communication Engineering Jiangxi University of Finance and Economics

A new symmetric key image encryption scheme based on hyper-chaotic Lorenz system is *** encryption process and the decryption process are identical in the proposed *** both include two diffusion operations,one plaintext-related scrambling operation and three matrix rotating 180 degrees *** hyper-chaotic Lorenz system is employed to generate the secret code streams to encrypt the plain image,and to implement the diffusion process with XOR *** plaintext-related scrambling is used in this scheme to make different plain images correspond to different secret code streams even when the secret keys are the same,so that the scheme can fight against the chosen/known plaintext *** results show that the proposed scheme has the merits of high encryption speed,large key space,strong key sensitivity,strong plaintext sensitivity,good statistical properties of cipher-text,and etc.,and can be used in practical communications.

关键词： Image encryption Hyper-chaotic Lorenz system Identical encryption and decryption algorithm Plaintext-related scrambling Security analysis

Electronic structures of impurities and point defects in semiconductors

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Chinese Physics B 2018年第11期27卷 358-371页

作者： yong zhang Department of Electrical and Computer Engineering University of North Carolina at Charlotte Charlotte NC 28223 US

A brief history of the impurity theories in semiconductors is provided. A bound exciton model is proposed for both donor-and acceptor-like impurities and point defects, which offers a unified understanding for ＂shallow＂ and ＂deep＂impurities and point defects. The underlying physics of computational results using different density-functional theorybased approaches are discussed and interpreted in the framework of the bound exciton model.

关键词： semiconductor shallow impurity deep impurity bound exciton density-functional theory effective-mass theory hydrogen model

Research on physical layer traffic management schemes in serial RapidIO interconnect

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The Journal of China Universities of Posts and Telecommunications 2011年第1期18卷 64-69页

作者： zhang yong WANG yong zhang Ping Wireless Technology Innovation Institute Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications 13eijing 100876 China

A traffic management scheme in serial RapidlO （SR10） interconnect is proposed to deal with the performance degradation caused by noise and electromagnetic interference （EMI）, which is generated by hardly avoidable errors of hardware implementation and tough working environment. The main idea of this scheme includes adaptive speed transition and freeze-acknowledgement （freeze-ACK）. Adaptive speed transition can improve throughput and reduce delay in high bit error rate （BER） environment. Simultaneously, freeze-ACK is adopted to conquer frequent usage of feedback channel. Simulation shows that the scheme of combining adaptive speed transition with freeze-ACK offers great performance improvement in SRIO network.

关键词： serial RapidIO traffc management physical layer traffic management adaptive speed transition frecze-ACK

Ground-State and Thermal Entanglement in Three-Spin Heisenberg-XXZ Chain with Three-Spin Interaction

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Communications in Theoretical Physics 2007年第2X期48卷 249-254页

作者： zhang yong Key Laboratory for Quantum Information and Measurements Department of Physics Tsinghua University Beijing 100084 China Department of Physics Beijing University of Posts and Telecommunications Beijing 100876 China Key Laboratory for Atomic and Molecular Nano-Sciences Tsinghua University Beijing 100084 China

The entanglement properties of a three-spin X X Z Heisenberg chain with three-spin interaction are studied by means of concurrence of pairwise entanglement. We show that ground-state pairwise entanglement, pairwise thermal entanglement, or quantum phase transition is not present in antiferromagnetic spin chain. For the ferromagnetic case, quantum phase transition takes place at A = 1 for anisotropic interaction and at some values of three-spin coupling strength, and pairwise thermal entanglement increases when the value of J/T increases and with anisotropic interaction and three-spin interaction decrease. In addition, we find that increasing the anisotropic interaction and the three-spin interaction will decrease critical temperature.

关键词： xspin chain thermal entanglement quantum phase transition

Hydrothermal growth of Ni-based coatings on copper substrates

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International Journal of Minerals,Metallurgy and Materials 2012年第3期19卷 259-265页

作者： Fang Liu yong zhang School of Materials Science and Engineering Dalian Jiantong UniversityDalian 116028China

Ni-based coatings were deposited on copper substrates by a hydrothermal approach. The results showed that a Ni-based cellular microstructure was bridged by ＂fiber-like＂ products. A high microhardness of Hv 856 was achieved after 400℃ heat treatment, which is nine times that of copper substrates （Hv 95）. Nucleation, growth, and fusion of Ni atoms along the linear direction, induced by a linear-type cit- rate-metal structural ＂molecule template＂, led to in-situ growth of Ni-based fibers between cellular microspheres. After 400℃ heat treatment, the precipitation of NiP and Ni3P hard phases contributed to the high microhardness of Ni-based coatings.

关键词： nickel-based coatings fibers hydrothermal synthesis copper microhardness

Morphology controllable growth of CaO/amorphous carbon ropes by a hydrothermal approach

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International Journal of Minerals,Metallurgy and Materials 2013年第2期20卷 187-195页

作者： yong zhang Fang Liu School of Materials Science and Engineering Dalian Jiaotong University

A versatile hydrothermal strategy for the growth of a centimeter-sized CaO/amorphous carbon rope was introduced in this article. It is demonstrated that the centimeter-sized rope is composed of abundant amorphous carbon ＂belt＂ and ＂stick＂ with small polygonal CaO particles in the size of 3.0-5.0 nm embedded in the ＂belt＂ and ＂stick＂ framework. With the increase in NaOH amount, polygonal Ca（OH）2 particles in the size of 0.5-3.0 μm are found, instead of the CaO/amorphous carbon rope. This morphology evolution results from the competition of structure-directing and hydrothermal-carbonizing of organic agents during hydrothermal reaction. These results may give good suggestions for the controllable growth of newly unique morphological micro/nano architectures in solution phase reactions.

关键词： amorphous carbon rope calcium oxide hydrothermal synthesis

A FAMILY OF THE LOCAL CONVERGENCE OF THE IMPROVED SECANT METHODS FOR NONLINEAR EQUALITY CONSTRAINED OPTIMIZATION SUBJECT TO BOUNDS ON VARIABLES

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Journal of Systems Science & Complexity 2014年第2期27卷 307-326页

作者： zhang yong ZHU Detong School of Mathematics and Physics Changzhou University Mathematics and Science College Shanghai Normal University

This paper studies a family of the local convergence of the improved secant methods for solving the nonlinear equality constrained optimization subject to bounds on variables. The Hessian of the Lagrangian is approximated using the DFP or the BFGS secant updates. The improved secant methods are used to generate a search direction. Combining with a suitable step size, each iterate switches to trial step of strict interior feasibility. When the Hessian is only positive definite in an affine null subspace, one shows that the algorithms generate the sequences converging q-linearly and two-step q-superlinearly. Yhrthermore, under some suitable assumptions, some sequences generated by the algorithms converge locally one-step q-superlinearly. Finally, some numerical results are presented to illustrate the effectiveness of the proposed algorithms.

关键词： Affine scaling local convergence secant methods second order correction.