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The development of microfabricated solenoids with magnetic cores for micromagnetic neural stimulation

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Microsystems & Nanoengineering 2021年第6期7卷 97-106页

作者： Adam Khalifa Mohsen Zaeimbashi Tony x.Zhou Seyed Mahdi Abrishami Neville sun Seunghyun Park TamaraŠumarac Jason Qu Inbar Zohar Amir Yacoby Sydney Cash Nian x.sun Department of Neurology Massachusetts General HospitalHarvard Medical SchoolBostonMAUSA Department of Electrical and Computer Engineering Northeastern UniversityBostonMAUSA Research Laboratory of Electronics Massachusetts Institute of TechnologyCambridgeMAUSA Department of Physics Harvard UniversityCambridgeMAUSA Department of Chemical and Biological Physics Weizmann Institute of ScienceRehovotIsrael

Electrical stimulation via invasive microelectrodes is commonly used to treat a wide range of neurological and psychiatric *** its remarkable success,the stimulation performance is not sustainable since the electrodes become encapsulated by gliosis due to foreign body *** stimulation overcomes these limitations by eliminating the need for a metal-electrode ***,we demonstrate a novel microfabricated solenoid inductor(80µm×40µm)with a magnetic core that can activate neuronal *** characterization and proof-of-concept of the device raise the possibility that micromagnetic stimulation solenoids that are small enough to be implanted within the brain may prove to be an effective alternative to existing electrode-based stimulation devices for chronic neural interfacing applications.

关键词： magnetic neural overcome

The strain rate sensitive and anisotropic behavior of rare-earth magnesium alloy ZEK100 sheet

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Journal of Magnesium and Alloys 2023年第3期11卷 882-891页

作者： H.Wang x.sun S.Kurukuri M.J.Worswick D.Y.Li Y.H.Peng P.D.Wu State Key Laboratory of Mechanical Systems and Vibration Shanghai Jiao Tong UniversityShanghai 200240China Materials Genome Initiative Center Shanghai Jiao Tong UniversityShanghai 200240China Department of Mechanical and Mechatronics Engineering University of WaterlooWaterlooOntario N2L 3G1Canada Department of Mechanical Engineering Mc Master UniversityHamiltonOntario L8S 4L7Canada

To overcome the limitation in formability at room temperature,manufacturers have developed magnesium alloys with remarkable properties by adding rare-earth *** rare-earth magnesium alloys behave differently from the conventional alloys,especially with respect to their coupled anisotropic and strain rate sensitive *** the current work,such behavior of the rare-earth Mg alloy ZEK100 sheet at room temperature is investigated with the aid of the elastic viscoplastic self-consistent polycrystal plasticity *** strain rate sensitivities(SRSs)for various deformation modes are employed by the model to simulate the strain rate sensitive behaviors under different loading directions and loading *** agreement between the experiments and simulations reveals the importance and necessity of using different SRSs for each deformation mode in hexagonal close-packed ***,the relative activities of each deformation mode and the texture evolution during different loadings are *** anisotropic and strain rate sensitive behavior is ascribed to the various operating deformation modes with different SRSs during loading along different directions.

关键词： Rare-earth magnesium alloy Strain rate sensitivity Twinning Crystal plasticity

The NUBASE2012 evaluation of nuclear properties

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Chinese Physics C 2012年第12期36卷 1157-1286页

作者： G.Audi F.G.Kondev M.Wang B.Pfeiffer x.sun J.Blachot M.MacCormick Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse CSNSMCNRS/IN2P3Universlte Paris-SudBat.108F-91405 Orsay CampusFrance Argonne National Laboratory 9700 S.Cass AvenueArgonneIL 60439USA Max-Planck-Institut fur Kernphysik Saupfercheckweg 1D-69117 HeidelbergGermany Institute of Modem Physics CAS509 Nanchang Rd.Lanzhou 730000China GSI Helmholtzzentrum fur Schwerionenforschung Planckstr.1D-64291 DarmstadtGermany Institut de Physique Nucléaire CNRS/IN2P3Universite Paris-SudF-91406 Orsay cedexFrance

This paper presents the NUBASE2012 evaluation that contains the recommended values for nuclear and decay properties of nuclides in their ground and excited isomeric （T1/2≥ 100 ns） states. All nuclides for which some experimental information is known are considered. NUBASE2012 covers all up to date experimental data published in primary （journal articles） and secondary （mainly laboratory reports and conference proceedings） references, together with the corresponding bibliographical information. During the development of NUBASE2012, the data available in the ＂Evaluated Nuclear Structure Data File＂（ENSDF） database were consulted, and critically assessed of their validity and completeness. Furthermore, a large amount of new and somewhat older experimental results that were missing in ENSDF were compiled, evaluated and included in NUI3ASE2012. The atomic mass values were taken from the ＂Atomic Mass Evaluation＂（AME2012, second and third parts of the present issue）. In cases where no experimental data were available for a particular nuclide, trends in the behavior of specific properties in neighboring nuclei （TNN） were examined. This approach allowed to estimate, whenever possible, values for a range of properties, and are labeled in NUBASE2012 as ＂non-experimental＂（flagged ＂#＂）. Evaluation procedures and policies that were used during the development of this database are presented, together with a detailed table of recommended values and their uncertainties.

关键词： IT Ru The NUBASE2012 evaluation of nuclear properties

Solid solution strengthening of high-entropy alloys from first-principles study

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Journal of Materials Science & Technology 2022年第26期121卷 105-116页

作者： H.L.Zhang D.D.Cai x.sun H.Huang S.Lu Y.Z.Wang Q.M.Hu L.Vitos x.D.Ding State Key Laboratory for Mechanical Behavior of Materials Frontier Institute of Science and TechnologyXi’an Jiaotong UniversityXi’an 710049China Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research College of StomatologyXi’an Jiaotong UniversityXi’an 710049China Department of Materials Science and Engineering The Ohio State University2041 College RoadColumbusOH 43210United States Institute of Metal Research Chinese Academy of SciencesShenyang 110016China Science and Technology on Surface Physics and Chemistry Laboratory Jiangyou 621908China Applied Materials Physics Department of Materials Science and EngineeringRoyal Institute of TechnologyStockholm SE-10044Sweden

Solid solution strengthening(SSS)is one kind of strengthening mechanisms and plays an important role in alloy design,in particular for single-phase alloys including high-entropy alloys(HEAs).The classical Labusch–Nabarro model and its expansions are most widely applicable to treating SSS of solid solution alloys including both conventional alloys(CAs)and *** this study,the SSS effects in a series of Febased CAs and HEAs are investigated by using the classical Labusch–Nabarro model and its *** size misfit and shear modulus misfit parameters are derived from first-principles *** on available experimental data in combination with empirical SSS model,we propose fitting constants(i.e.,the ratio between experimental hardness and predicted SSS effect)for these two families of *** predicted host/alloy family-dependent fitting constants can be used to estimate the hardness of these SSS *** agreement between predicted and measured hardness values is satisfactory for both CAs and HEAs,implying that the proposed approach is reliable and successful.

关键词： Alloys Solid solution strengthening Hardness Size misfit parameter Shear modulus misfit parameter First-principles calculations

Enhanced mechanical performance of grain boundary precipitation-hardened high-entropy alloys via a phase transformation at grain boundaries

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Journal of Materials Science & Technology 2021年第27期86卷 271-284页

作者： Y.L.Qi L.Zhao x.sun H.x.Zong x.D.Ding F.Jiang H.L.Zhang Y.K.Wu L.He F.Liu S.B.Jin G.Sha J.sun State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an710049China Analytical&Testing Center Northwestern Polytechnical UniversityXi’an710072China School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing210094China

Grain-boundary(GB)precipitation has a significant adverse effect on plasticity of alloys,which easily leads to catastrophic intergranular failure in safety-critical applications under high external ***,we report a novel strategy that uses the local stress concentration induced by GB precipitates as a driving force to trigger phase transformation of preset non-equiatomic high-entropy solid-solution phase at *** in situ deformation-induced phase transformation at GBs introduces a well-known effect:transformation-induced plasticity(TRIP),which enables an exceptional elongation to fracture(above 38%)at a high strength(above 1.5 GPa)in a GB precipitation-hardened high-entropy alloy(HEA).The present strategy in terms of"local stress concentration-induced phase transformations at GBs"may provide a fundamental approach by taking advantage of(rather than avoiding)the GB precipitation to gain a superior combination of high strength and high ductility in HEAs.

关键词： Non-equiatomic Grain-boundary precipitation High-entropy alloys Ductility Transformation-induced plasticity

ENERGY-LOSS FUNCTIONS DERIVED FROM REELS SPECTRA FOR ALUMINUM

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Acta Metallurgica Sinica(English Letters) 2005年第3期18卷 217-222页

作者： Z.M.Zhang Z.J.Ding H.M.Li K.Salma x.sun R.Shimizu T.Koshikawa K.Goto StructureResearchLaboratoryandDepartmentofPhysics UniversityofScienceandTechnologyofChinaTheChineseAcademyofSciencesHefei230026China DepartmentofInformationScience OsakaInstituteofTechnologyOsaka573-0196Japan FundamentalElectronicsResearchInstitute OsakaElectro-CommunicationUniversityOsaka572-8530Japan DepartmentofSystemsEngineering NagoyaInstituteofTechnologyNagoya466-8555Japan

The effective energy loss functions for Al have been derived from differential i nverse inelastic mean free path based on the extended Landau approach. It has be en revealed that the effective energy loss function is very close in value to th e theoretical surface energy loss function in the lower energy loss region but g radually approaches the theoretical bulk energy loss function in the higher ener gy loss region. Moreover, the intensity corresponding to surface excitation in e ffective energy loss functions decreases with the increase of primary electron e nergy. These facts show that the present effective energy loss function describe s not only surface excitation but also bulk excitation. At last, REELS spectra s imulated by Monte Carlo method based on use of the effective energy loss functio ns has reproduced the experimental REELS spectra with considerable success.

关键词： effective energy loss function Monte Carlo simulation extended Landau approach reflection electron energy loss spectro scopy Aluminum

A CRITERION FOR TWO KINDS OF PEIERLS TRANSITIONS

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Chinese Physics Letters 1985年第3期2卷 141-144页

作者： Z.Wang C.Wu x.sun Department of Physics Fudan UniversityShanghai

Two different kinds of Peierls transitions can exist depending on the anisotropic ratio y of intrachain and interchain coupling.γhas a critical valueγo;if_(γ>γo),the Peierls transition will exhibit a CDW accompanied by a metal-semiconductor transition(kind I);if_(γcγo),only CDW and superlattice occur at Peierls transition(kind II).Some experimental evidences are discussed.

关键词： coupling. transition transitions

BAR-based Optimum Adaptive Sampling Regime for Variance Minimization for Alchemical Transformation

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BAR-based Optimum Adaptive Sampling Regime for Variance Mini...

Reversible solid-oxide cells for clean and sustainable energy

第十三届全国量子化学会议

作者： Zhao x.sun xiao H.Wang John Z.H.Zhang State Key Laboratory of Precision Spectroscopy Institute of Theoretical and Computational Science East China Normal University NYU-ECNU Center for Computational Chemistry at NYU Shanghai School of Chemistry and Molecular Engineering East China Normal University Department of Chemistry New York University

The efficiency of alchemical free energy simulation with staging strategy is improved by adaptively manipulating the significance of each ensemble followed by importance *** OBAR(optimum BAR) method introduced in this work with explicit consideration of the statistical inefficiency in each ensemble outperforms the traditional equal time rule which is used in standard applications of alchemical transformation with window sampling regime in the sense of minimizing the total variance of free energy estimate. The Time Derivative of total Variance(TDV) is proposed for OBAR criterion which is linearly dependent on the variance and is more sensitive to the phase space overlap than the overlap matrix. The performance of OBAR workflow is demonstrated for solvation of several small molecules and a protein ligand binding system.

关键词： BAR-based Optimum Adaptive Sampling Regime for Variance Minimization for Alchemical Transformation

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Clean Energy 2019年第3期3卷 175-201页

作者： M.B.Mogensen M.Chen H.L.Frandsen C.Graves J.B.Hansen K.V.Hansen A.Hauch T.Jacobsen S.H.Jensen T.L.Skafte x.sun Department of Energy Conversion and Storage Technical University of Denmark(DTU)Frederiksborgvej 399DK-4000 RoskildeDenmark Haldor Topsøe Haldor Topsøes Allé1DK-2800 Lyngby Department of Chemistry Technical University of DenmarkDK-2800 Kgs.LyngbyDenmark DynElectro ApS DK-4621 GadstrupDenmark

This review gives first a brief view of the potential availability of sustainable *** is clear that over 100 times more solar photovoltaic energy than necessary is readily accessible and that practically available wind alone may deliver sufficient energy supply to the *** to the intermittency of these sources,effective and inexpensive energy-conversion and storage technology is *** for the possible electrolysis application of reversible solid-oxide cells(RSOCs),including a comparison of power-to-fuel/fuel-to-power to other energy-conversion and storage technologies is *** electrochemistry and chemistry of H_(2)O,CO_(2),H_(2),CO,CnHm(hydrocarbons)and NH3,including thermodynamics and cell performance,are *** mechanical strength of popular cell supports is outlined,and newly found stronger materials are *** cell-degradation mechanisms,including the effect of common impurities in gases and materials(such as S and Si),plus the deleterious effects of carbon deposition in the fuel electrode are described followed by explanations of how to avoid or ease the *** of how RSOCs powered by sustainable energy may be applied on a large scale for the transportation sector via power-to-fuel technology and for integration with the electrical grid together with seasonal storage are ***,a brief comparison of RSOCs to other electrolysis cells and an outlook with examples of actions necessary to commercialize RSOC applications are sketched.

关键词： electrolysis fuel cells solid-oxide cells power-to-fuel electrochemical syngas