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Fabrication and characterization of Cu–Zn–Sn shape memory alloys via an electrodeposition–annealing route

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International Journal of Minerals,Metallurgy and Materials 2019年第11期26卷 1436-1449页

作者： richard Espiritu Alberto Amorsolo Jr. Department of Mining Metallurgical and Materials Engineering University of the Philippines Diliman

Cu–Zn–Sn shape memory alloys(SMAs)with an average composition of 56.0 at%,36.1 at%,and 7.9 at%for Cu,Zn,and Sn,respectively,were successfully fabricated via an electrodeposition–annealing *** produced SMAs were assessed for shape memory response in terms of percent displacement(martensite phase recovery)by subjecting the ternary alloys to flame tests and subsequently characterizing them via differential scanning calorimetry(DSC),optical microscopy,scanning electron microscopy in conjunction with energy-dispersive spectroscopy(SEM-EDS),and X-ray diffraction(XRD)*** flame tests showed that the highest displacement was ca.93%,with average austenite and martensitic start transformation temperature of 225°C and 222°C,*** analysis revealed that the intermetallic phases responsible for the observed shape memory properties have substitutional Zn in the lattice occupied by Cu and Sn,leading to the formation of Cu(Zn,Sn)and Cu6(Zn,Sn)5 *** formation of these variants was attributed to the faster interdiffusion of Cu into Sn,driven by an activation energy of 34.82 kJ·mol^-*** cycles of repeated torching–annealing revealed an essentially constant shape memory response,suggesting that the fabricated SMAs were consistent and sufficiently reliable for their intended service application.

关键词： electrodeposition annealing intermetallics martensitic transformation shape memory alloy

Combining X-ray microtomography with computer simulation for analysis of granular and porous materials

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Particuology 2010年第2期8卷 81-99页

作者： Roberto Moreno-Atanasio richard A. Williams Institute of Particle Science and Engineering School of Process Environmental and Materials Engineering University of Leeds Leeds LS2 9JT UK

The use of X-ray microtomographic （XMT） methods in analysing particulate systems has expanded rapidly in recent years with the availability of affordable desk-top apparatus. This review presents a summary of the major applications in which computer simulations are explicitly coupled with XMT in the area of granular and porous materials. We envisage two main ways of establishing the coupling between both techniques, based on the transference or exchange of information by using physical or geometrical parameters （i.e. a parametric link through fitting to a process model） or through the direct use of3D XMT digital images （i.e. comparing image pixels and features directly）. Examples of coupled applications are shown for the study of transport properties of rocks, particle packing, mechanical loading and sintering. Often, the link between XMT and computer simulations is based on visual comparisons and we conclude that the use of quantitative parameters such as the number of interparticle contacts, force networks or granule shape to link both techniques is still underrepresented in the literature. Strategies to provide a more robust and quantitative approach to optimise the information obtained from such tomography analyses are proposed. 2010 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.

关键词： X-ray microtomographyGranular flowComputer modellingLattice Boltzmann methodDiscrete element method

Electro-oxidation of hydrazine shows marcusian electron transfer kinetics

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Science China Chemistry 2021年第2期64卷 322-329页

作者： Ruiyang Miao Lifu Chen richard G Compton Department of Chemistry Physical and Theoretical Chemistry LaboratoryUniversity of OxfordSouth Parks RoadOxfordOX13QZUK

Although hydrazine(N2 H4) oxidation in an electrochemical environment has been of great interest for years,its intrinsic electron transfer kinetics remain *** report that the phenomenological Butler-Volmer(BV) theory is not appropriate for interpreting the process of hydrazine oxidation for which an astonishingly wide range of transfer coefficients,Tafel slopes and diffusion coefficient have been previously *** Tafel analysis for voltammetry recorded at Glassy Carbon(GC)electrodes reveals a strong potential dependence of the anodic transfer coefficient,consistent with the symmetric Marcus-Hush(sMH) *** to the relationship β=λ+FEf^0/2λ-F/2λ E,the reorganization energy(0.35±0.07 eV) and an approximate formal potential of the rate-determining first electron transfer were successfully extracted from the voltammetric responses.

关键词： hydrazine electrode kinetics transfer coefficient Butler-Volmer theory Marcus-Hush theory

Linking axon transport to regeneration using in vitro laser axotomy

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Neural Regeneration Research 2018年第3期13卷 410-412页

作者： Bart Nieuwenhuis richard Eva John van Geest Centre for Brain Repair Department of Clinical Neurosciences University of Cambridge Cambridge UK Laboratory for Regeneration of Sensorimotor Systems Netherlands Institute for Neuroscience Royal Netherlands Academy of Arts and Sciences (KNAW) Amsterdam The Netherlands

Spinal cord injury has devastating consequences because adult central nervous system （CNS） neurons do not regenerate their axons after injury. Two key reasons for axon regeneration fail- ure are extrinsic inhibitory factors and a low intrinsic capacity for axon regrowth. Research has therefore focused on overcom- ing extrinsic growth inhibition, and enhancing intrinsic regeneration capacity. Both of these issues will need to be addressed to enable optimal repair of the injured sp＋inal cord.

关键词： CNS ARF Linking axon transport to regeneration using in vitro laser axotomy EFA

A review of the use of geosocial media data in agent-based models for studying urban systems

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Big Earth Data 2021年第1期5卷 5-23页

作者： richard Wen Songnian Li Department of Civil Engineering Ryerson UniversityTorontoCanada

Since the rapid growth of urban populations,the study of urban systems has gained considerable attention from researchers,decision makers,governments,and *** systems are complex and dynamic such that they produce emergent patterns such as selforganization and ***-based modelling presents an approach to simulating and abstracting urban systems to reveal and study emergent patterns from urban-related ***,agent-based models are difficult to effectively optimize and validate without high quality real-world *** media data provides agent-based models with location-enabled data at high volumes and *** agent-based models with geosocial media data presents opportunities in advancing and developing studies in urban *** paper provides a general overview of concepts,review of recent applications,and discussion of challenges and opportunities in the context of using geosocial media data in agentbased models for urban *** argue that ABMs focused on studying urban systems can benefit greatly from geosocial media data,given that research moves towards standard guidelines that enable the comparison and effective use of ABMs,and geosocial media data under appropriate circumstances and applications.

关键词： Agent based modelling geosocial media urban systems review abm social media gis

Dyke Swarms: Keys to Paleogeographic Reconstructions, Preface for IDC7 2016

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维普期刊数据库

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Acta Geologica Sinica(English Edition) 2016年第S1期90卷 3-5页

作者： PENG Peng richard ERNST State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Scientist in Residence Department of Earth Sciences Carleton University Faculty of Geology and Geography Tomsk State University

Focusing on geological,geochemical and geophysical aspects of dykes and related units,the International Dyke Conference(IDC)series was launched in Toronto,Canada in 1985 by *** ***(University of Toronto).It has contin... 详细信息

关键词： IDC Dyke Swarms Keys to Paleogeographic Reconstructions Preface for IDC7 2016

The discovery of magnetotactic/magnetosensitive bacteria

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Chinese Journal of Oceanology and Limnology 2009年第1期27卷 1-2页

作者： richard B. FRANKEL Department of Physics California Polytechnic State University San Luis Obispo

Magnetotactic bacteria orient and migrate along magnetic field lines in aquatic habitats. The first paper on this phenomenon was written by richard P. Blakemore （Blakemore, 1975; 1982）.

关键词： magnetotaxis magnetosensitivity bacteria discovery

The DSP handbook : algorithms, applications and design techniques 英文版影印版

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Evidence of Specific MJO Phase Occurrence with Summertime California Central Valley Extreme Hot Weather

丛书名：经典原版书库

2003年

作者： bateman Andrew.

本书以文字叙述和形象化表达相结合的方式描述各主题，不仅包括 DSP设计开发平台，{27542b}、DSP器件的内部结构，还以工具箱的形式介绍了DSP的算法解决方案。

ISBN: (数字)7111117514

ISBN: (纸本)7111117514

关键词： Signal processing

来源：畅想之星图书光盘版（南... 评论

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畅想之星图书光盘版（南通市图书馆镜像）

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Advances in Atmospheric Sciences 2019年第6期36卷 589-602页

作者： Yun-Young LEE richard GROTJAHN Asia-Pacific Economic Cooperation Climate Center Department of Land Air and Water Resources University of California

This study examines associations between California Central Valley(CCV) heat waves and the Madden Julian Oscillation(MJO). These heat waves have major economic impact. Our prior work showed that CCV heat waves are frequently preceded by convection over the tropical Indian and eastern Pacific oceans, in patterns identifiable with MJO phases. The main analysis method is lagged composites(formed after each MJO phase pair) of CCV synoptic station temperature, outgoing longwave radiation(OLR), and velocity potential(VP). Over the CCV, positive temperature anomalies occur only after the Indian Ocean(phases 2-3) or eastern Pacific Ocean(phases 8-1) convection(implied by OLR and VP fields). The largest fractions of CCV hot days occur in the two weeks after onset of those two phase pairs. OLR and VP composites have significant subsidence and convergence above divergence over the CCV during heat waves, and these structures are each part of larger patterns having significant areas over the Indian and Pacific Oceans. Prior studies showed that CCV heat waves can be roughly grouped into two clusters: Cluster 2 is preceded by a heat wave over northwestern North America, while Cluster 1 is not. OLR and VP composite analyses are applied separately to these two clusters. However, for Cluster 2, the subsidence and VP over the CCV are not significant, and the large-scale VP pattern has low correlation with the MJO lagged composite field. Therefore, the association between the MJO convection and subsequent CCV heat wave is more evident in Cluster 1 than Cluster 2.

关键词： MJO heat wave large-scale meteorological pattern extratropical response tropical convection