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Spectral linear correlations in the random $sd$-boson sy.tem

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Spectral linear correlations in the random $sd$-boson system

THE FORMATION OF ACICULAR AUSTENITE DURING IN TERCRITICAL ANNEALING OF STEEL 30CrMnSiA

第十四届全国核物理大会暨第十届会员代表大会

作者： y. lei Department of Phy.ics, Shanghai Jiao Tong University. Shanghai 200240, China

With random two-body.interaction,we study.the collective motions via the Mallmann plot in the $sd$-boson *** find four spectral linear correlations beside the well-know

关键词： IBM random interaction AHV $d$-boson condensat

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cnki会议

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Acta Metallurgica Sinica(English Letters) 1999年第4期12卷 728-732页

作者： Z.M. Ding1) , y. lei2) and L.J. Lao1) 1)Department of Materials Engineering ,Dalian Railway.Institute,China 2)Department of Materials Science & Engineering ,Dalian University.of Technology.,China

Theacicular austeniteformation process duringintercritical annealing atslow heating speedof0 5 ℃/ min isinvestigated using TEMin the sample of 30 CrMnSiA. The resultsshow thatinthe preliminary.tage, austenitesnucleateintheform ofshortneedle atshort rod like cementites, which hasthesame orientation and precipitates along the boundary.of original martensitelathes. Asthetemperatureincreasingslowly. the austenites grow up and connect witheach other alongtheboundary.ftheoriginallathesso astoform acicular austenite. At last,the fully. grown austenite connectsin the direction verticalto the boundary.of lathes, leavingthe remnant ferrites appear in the shape of rhombus, the original austenite grainshaperecovers and the feature of thethick lath remains. The superledgeinterface has been found and someaustenitegrowsintoferritein theshapeoflath.

关键词： austenitictransformation,intercriticalannealing acicular austenite

Review on sy.ergistic damage effect of irradiation and corrosion on reactor structural alloy.

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Nuclear Science and Techniques 2024年第3期35卷 109-141页

作者： Hui Liu Guan-Hong lei He-Fei Huang Shanghai Institute of Applied Phy.ics Chinese Academy of SciencesShanghai 201800China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China

The sy.ergistic damage effect of irradiation and corrosion of reactor structural materials has been a prominent research *** paper provides a comprehensive review of the sy.ergistic effects on the third-and fourth-generation fission nuclear energy.structural materials used in pressurized water reactors and molten salt *** competitive mechanisms of multiple influencing factors,such as the irradiation dose,corrosion ty.e,and environmental temperature,are summarized in this *** approaches are proposed to alleviate the sy.ergistic damage caused by.irradiation and corrosion,thereby.promoting in-depth research in the future and solving this key.challenge for the structural materials used in reactors.

关键词： Irradiation and corrosion Sy.ergistic effect Austenitic stainless steels Nickel-based alloy. Reactors

Nonadiabatic Holonomic Quantum Computation Based on Ry.berg Ground State Blockade

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Chinese Phy.ics Letters 2024年第4期41卷 25-31页

作者：苏石磊王琛宋佩瑶陈刚 School of Phy.ics Zhengzhou UniversityZhengzhou 450001China

Quantum gates are crucial for quantum computation and quantum information processing. However, their effectiveness is often hindered by.sy.tematic errors and decoherence. Therefore, achieving resilient quantum gates to these factors is of great significance. We present a method to construct nonadiabatic holonomic single-and two-qubit gates in a Ry.berg ground-state-blockade regime. Our approach utilizes a far-off-resonant technique for the single-qubit gate and a modified Ry.berg antiblockade for the two-qubit gate. The reduction of the population of single-and two-excitation Ry.berg states and the nonadiabatic holonomic process during the construction of the gates ensure robustness to decoherence and sy.tematic errors, respectively. Numerical results demonstrate the fidelity.and robustness of our scheme. The proposed scheme holds promise for future applications in quantum computation and quantum information processing tasks.

关键词： Ry.berg quantum holds

Data-driven rational design of single-atom materials for hy.rogen evolution and sensing

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Nano Research 2024年第4期17卷 3352-3358页

作者： lei Zhou Pengfei Tian Bowei Zhang Fu-Zhen Xuan Shanghai Key.Laboratory.of Intelligent Sensing and Detection Technology East China University of Science and TechnologyShanghai 200237China School of Mechanical and Power Engineering East China University of Science and TechnologyShanghai 200237China Key.Laboratory.of Pressure Sy.tems and Safety.of Ministry.of Education East China University of Science and TechnologyShanghai 200237China

Herein we proposed a data-driven high-throughput principle to screen high-performance single-atom materials for hy.rogen evolution reaction(HER)and hy.rogen sensing by.combing the theoretical computations and a topology.based multi-scale convolution kernel machine learning *** the rational training by.25 groups of data and prediction of all 168 groups of single-atom materials for HER and sensing,respectively.a high prediction accuracy.>0.931 R^(2) score)was achieved by.our *** show that the promising HER cataly.ts include Pt atoms in C_(4) and Sc atoms in C_(1)N_(3) coordination ***,y.atoms in C_(4) coordination environment and Cd atoms in C_(2)N_(2)-ortho coordination environment were predicted with great potential as hy.rogen sensing *** method provides a way.to accelerate the discovery.of innovative materials by.avoiding the time-consuming empirical principles in experiments.

关键词： machine learning single-atom materials sensing hy.rogen evolution

The growth ofβphase in Mg-Gd-y.Ni alloy.by.experimental and first-principles study

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Journal of Magnesium and Alloy. 2024年第2期12卷 506-515页

作者： y.qiang Hao lei Zhou Zhiqing Chen Zhixian Zhao Bin Chen School of Materials Science and Engineering Shanghai Jiao Tong University800 Dongchuan RoadShanghai200240China

The paper reports on the atomic investigation aboutβphase in Mg_(96)Gd_(2)y.(1)Ni_(1) alloy.by.using the first-principles study.and the high-angle annular dark-field scanning transmission electron microscope(HAADF-STEM)corrected by.atomic *** using HAADF-STEM,the rectangularβphases were observed in the underage and peak aging stages in Mg_(96)Gd_(2)y.(1)Ni_(1) ***βphase could be precipitated from the previously.precipitatedβphase,and theβphase grew in steps when it was precipitated.A special transition structure of three atomic lay.r thicknesses was first observed at the edge of theβphase and the structure of this interface is probably.as theβ/Mg_(1) interface for the analy.is of thermody.amic characterization and electronic ***β'phase and theβ_(H) structure were precipitated only.at the edge of the length directions of theβ***β'phase continues to grow into aβphase directly.without the formation ofβ_(1) phase,resulting in an increase in the length of theβphase,which is discovered for the first time.

关键词： HAADF-STEM First-principles study Mg-Gd-y.Ni alloy βphase Growth Interface

PRX1-positive mesenchy.al stem cells drive molar morphogenesis

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International Journal of Oral Science 2024年第2期16卷 293-305页

作者： Xiaoqiao Xu Xuy.n Gong lei Zhang Han Zhang y.o Sun Department of Implantology Stomatological Hospital and Dental School of Tongji UniversityShanghai Engineering Research Center of Tooth Restoration and RegenerationShanghaiChina

Mammalian teeth,developing inseparable from epithelial-mesenchy.al interaction,come in many.shapes and the key.factors governing tooth morphology.deserve to be *** merging single-cell RNA sequencing analy.is with lineage tracing models,we have unearthed a captivating correlation between the contrasting morphology.of mouse molars and the specific presence of PRX1^(+)cells within *** PRX1^(+)cells assume a profound responsibility.in shaping tooth morphology.through a remarkable divergence in dental mesenchy.al cell *** into the mechanisms,we have discovered that Wnt5a,bestowed by.mesenchy.al PRX1^(+)cells,stimulates mesenchy.al cell proliferation while orchestrating molar morphogenesis through WNT signaling *** loss of Wnt5a exhibits a defect phenoty.e similar to that of *** addition of WNT5A can successfully.reverse the inhibited cell proliferation and consequent deviant appearance exhibited in Prx1-deficient tooth *** findings bestow compelling evidence of PRX1-positive mesenchy.al cells to be potential target in regulating tooth morphology.

关键词： Wnt5a mesenchy.al inhibited

Efficient and Stable Inverted Perovskite Solar Modules Enabled by.Solid-Liquid Two-Step Film Formation

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Nano-Micro Letters 2024年第9期16卷 571-582页

作者： Juan Zhang Xiaofei Ji Xiaoting Wang Liujiang Zhang Ley. Bi Zhenhuang Su Xingy. Gao Wenjun Zhang lei Shi Guoqing Guan Abuliti Abudula Xiaogang Hao Liy.u y.ng Qiang Fu Alex K.‑y.Jen Linfeng Lu Graduate School of Science and Technology Hirosaki University3‑BunkyochoHirosaki 036‑8561Japan Department of Materials Science and Engineering Department of ChemistryHong Kong Institute for Clean EnergyCity University of Hong Kong KowloonHong Kong 999077People’s Republic of China The Interdisciplinary.Research Center Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210People’s Republic of China Shanghai Sy.chrotron Radiation Facility.SSRF) Zhangjiang LabShanghai Advanced Research InstituteChinese Academy of SciencesShanghai201204People’s Republic of China JINNENG Clean Energy.Technology.Ltd. Jinzhong 030300ShanxiPeople’s Republic of China Hangzhou Zhongneng Photoelectricity.Technology.Co. Ltd.Hangzhou 310018People’s Republic of China College of Chemical Engineering and Technology Taiyuan University of TechnologyTaiyuan 030024People’s Republic of China Institute of Regional Innovation Hirosaki University3‑BunkyochoHirosaki 036‑8561Japan

A considerable efficiency.gap exists between large-area perovskite solar modules and small-area perovskite solar *** control of forming uniform and large-area film and perovskite cry.tallization is still the main obstacle restricting the efficiency.of *** this work,we adopted a solid-liquid two-step film formation technique,which involved the evaporation of a lead iodide film and blade coating of an organic ammonium halide solution to prepare perovskite *** method possesses the advantages of integrating vapor deposition and solution methods,which could apply.to substrates with different roughness and avoid using toxic solvents to achieve a more uniform,large-area perovskite ***,modification of the NiO_(x)/perovskite buried interface and introduction of Urea additives were utilized to reduce interface recombination and regulate perovskite *** a result,a large-area perovskite film possessing larger grains,fewer pinholes,and reduced defects could be *** inverted PSM with an active area of 61.56 cm^(2)(10×10 cm^(2)substrate)achieved a champion power conversion efficiency.of 20.56%and significantly.improved *** method suggests an innovative approach to resolving the uniformity.issue associated with large-area film fabrication.

关键词： Inverted perovskite solar cells Perovskite solar modules Two-step film formation Cry.tallization Defect passivation

Local search y.elds a PTAS for fixed-dimensional k-means problem with penalties

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Journal of the Operations Research Society.of China 2024年第2期12卷 351-362页

作者： Fan y.an Da-Chuan Xu Dong-lei Du Dong-Mei Zhang Beijing Institute for Scientific and Engineering Computing Beijing University of TechnologyBeijing 100124China Faculty.of Management University of New BrunswickFrederictonNB E3B 9Y2Canada School of Computer Science and Technology Shandong Jianzhu UniversityJinan 250101ShandongChina

We study.a problem called the k-means problem with penalties(k-MPWP),which is a natural generalization of the ty.ical k-means *** this problem,we have a set D of client points in R^(d),a set F of possible centers in R^(d),and a penalty.cost Pj>O for each point j∈*** are also given an integer k which is the size of the center point *** want to find a center point set S■F with size k,choose a penalized subset of clients P■D,and assign every.client in D\P to its open *** goal is to minimize the sum of the squared distances between every.point in D\P to its assigned centre point and the sum of the penalty.costs for all clients in *** using the multi-swap local search technique and under the fixed-dimensional Euclidean space setting,we present a poly.omial-time approximation scheme(PTAS)for the k-MPWP.

关键词： Approximation algorithm k-means Local search Penalty