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Coarse to Fine: The Role of Severe Plastic Deformation in Advancing Titanium-Based medical Implants - A Comprehensive Review

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 295-306页

作者： Dragana R Mihajlović Bojan I međo Ivana Lj Cvijović-Alagić Veljko R Djokić Faculty of Technology and metallurgy University of BelgradeKarnegijeva 411120 BelgradeSerbia Vinča Institute of Nuclear Sci-ences-National Institute of the Republic of Serbia University of Belgrade11001BeogradSerbia Innovation Centre of the Faculty of Technology and metallurgy Karnegijeva 411120 BelgradeSerbia

This paper describes severe plastic deformation(SPD)procedures,which are utilized to form an ultrafine-grained structure in metallic *** the SPD process,a solid material sample is subjected to very high loads without a significant change in sample *** the present work,the high-pressure torsion(HPT)process,as one of the SPD techniques,which achieves a high degree of deformation and ensures refinement of the microstructure,will be discussed in more *** that grain size control is accepted as a method to obtain materials with desired characteristics,an overview of the properties of ultrafine-grained titanium-based biomaterials to be used in medicine is ***,particular attention is dedicated to the influences of HPT process parameters,primarily hydrostatic pressure,and number of revolutions during torsion,on the grain size and physical and mechanical characteristics(modulus of elasticity,microhardness,and tensile properties),corrosion resistance,and biocompatibility of the titanium-based biomaterials.A review of the literature indicates that titanium-based materials obtained by the SPD process show improved mechanical and physical properties without losing biocompatibility and corrosion resistance,which suggests that these methods of obtaining implants are something that should be further developed in the future.

关键词： high-pressure torsion process ultrafine-grained titanium-based materials electrochemical anodization physical properties mechanical properties

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基于胱抑素C和肌酐估算的肾小球滤过率差异及衰弱和不良结局的相关性

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中华高血压杂志 2021年第1期29卷 91-91页

作者：袁源(摘译) 练桂丽(审校) Potok OA Ix JH Shlipak MG Katz R Hawfield AT Rocco MV Ambrosius WT cho me Pajewski NM Rastogi A Rifkin DE 不详

在之前的研究和实践中,尚未对基于胱抑素C水平估算的肾小球滤过率(estimated glomerular filtration rate,eGFR,eGFR胱抑素)和基于肌酐水平估算的eGFR(eGFR肌酐)之间差异的临床重要性和相关性进行评估。研究者旨在评估这些差异是否包含... 详细信息

在之前的研究和实践中,尚未对基于胱抑素C水平估算的肾小球滤过率(estimated glomerular filtration rate,eGFR,eGFR胱抑素)和基于肌酐水平估算的eGFR(eGFR肌酐)之间差异的临床重要性和相关性进行评估。研究者旨在评估这些差异是否包含衰弱的重要信息。研究设计:一项收缩压干预试验(the systolic blood pressure intervention trial,SPRINT)的队列分析。设置与参与者:SPRINT(9 092例)高血压参与者在基线时检测血清肌酐、胱抑素C和衰弱水平。

关键词：估算的肾小球滤过率胱抑素C 不良结局肌酐水平队列分析

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强化降压对高血压患者左心室肥厚的影响

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中华高血压杂志 2017年第6期25卷 571-571页

作者：刘莉叶鹏 Soliman EZ Ambrosius WT Cushman WC Zhang ZM Bates JT Neyra JA Carson TY Tamariz L Ghazi L cho me Shapiro BP He J Fine LJ Lewis CE SPRINT Research Study Group

目前尚不清楚超出推荐值的强化降压是否更能降低高血压患者的左心室肥厚（left ventricular hypertrophy,LVH）发生风险,以及LVH风险降低能否解释强化降压的益处。Soliman等纳入收缩压干预试验（systolic blood pressure intervention,S... 详细信息

目前尚不清楚超出推荐值的强化降压是否更能降低高血压患者的左心室肥厚（left ventricular hypertrophy,LVH）发生风险,以及LVH风险降低能否解释强化降压的益处。Soliman等纳入收缩压干预试验（systolic blood pressure intervention,SPRINT）中患有高血压但无糖尿病的8164例受试者（平均年龄67.9岁,女性35.3%,31.2%为非洲裔）,

关键词：高血压患者左心室肥厚降压发生风险干预试验平均年龄推荐值 LVH

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Cenozoic ultrahigh-temperature metamorphism in pelitic granulites from the Mogok metamorphic belt, Myanmar

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Science China Earth Sciences 2021年第11期64卷 1873-1892页

作者： Si CHEN Yi CHEN Yibing LI Bin SU Qinghua ZHANG me me AUNG Kyaing SEIN State Key Laboratory of Lithospheric Evolution and Institutions of Earth ScienceInstitute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Chinese Academy of Sciences Center for Excellence in Tibetan Plateau Earth Sciences Beijing 100101China University of Chinese Academy of Sciences Beijing 100049China Geology Department Myitkyina UniversityKachin StateMyitkyina 01012Myanmar Myanmar Geosciences Society Hlaing University CampusYangon 11062Myanmar

Ultrahigh-temperature(UHT)metamorphism is critical for understanding the most extreme thermal evolution of continental ***,UHT metamorphism predominantly occurred in the Precambrian and is rarely observed in the modern ***,we report the discovery of~25 Ma UHT granulites from the Mogok metamorphic belt(MMB)in Myanmar via a combined study of petrology and *** studied pelitic granulites well preserve a peak mineral assemblage of garnet+sillimanite+plagioclase(antiperthite)+K-feldspar+quartz+Ti-rich biotite+rutile+***(P)-temperature(T)pseudosections and conventional geothermobarometry data only constrain the P-T conditions of the peak stage tometer and X_(Grs) isopleth in the pseudosections yield peak P-T conditions of~12 kbar and>900°*** situ SIMS and LAICP-MS U-Pb dating and trace element analyses show that both metamorphic zircon cores and rims have flat heavy rare earth element(HREE)patterns with negative Eu *** metamorphic zircon rims show the lowest HREE contents and yield ^(206)Pb/^(238)U ages of 24.9±0.5 and 25.4±0.6 Ma,respectively,representing the timing of UHT *** results indicate that the central MMB underwent~25 Ma UHT metamorphism,which is possibly induced by continental rifting along the thinned orogenic *** data,as well as reported Cenozoic UHT events,further suggest that UHT metamorphism can be produced in the modern plate tectonic regime by lithospheric extension.

关键词： Mogok metamorphic belt Ultrahigh-temperature metamorphism Pelitic granulites Zr-in-rutile thermometry Zircon chronology

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Efficient Autonomous Defense System Using Machine Learning on Edge Device

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Computers, Materials & Continua 2022年第2期70卷 3565-3588页

作者： Jaehyuk cho School of Electronic Engineering Soongsil UniversitySeoul06978Korea

As a large amount of data needs to be processed and speed needs to be improved,edge computing with ultra-low latency and ultra-connectivity is emerging as a new *** changes can lead to new cyber risks,and should therefore be considered for a security threat *** this end,we constructed an edge system to study security in two directions,hardware and ***,on the hardware side,we want to autonomically defend against hardware attacks such as side channel attacks by configuring field programmable gate array(FPGA)which is suitable for edge computing and identifying communication status to control the communication method according to *** addition,on the software side,data collected on the server performs end-to-end encryption via symmetric encryption ***,we modeled autonomous defense systems on the server by using machine learning which targets to incoming and outgoing *** log utilizes existing intrusion detection datasets that should be used in real-world *** log was used to detect intrusion early by modeling an intrusion prevention system to identify behaviors that violate security policy,and to utilize the existing intrusion detection data set that should be used in a real *** this,we designed an efficient autonomous defense system that can provide a stable system by detecting abnormal signals from the device and converting them to an effective method to control edge computing,and to detect and control abnormal intrusions on the server side.

关键词： Autonomous defense side channel attack intrusion prevention system edge computing machine learning

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Magnetoresistivity studies for BiPb-2223 phase added by BaSnO3 nanoparticles

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Journal of Advanced Ceramics 2017年第2期6卷 100-109页

作者： Mai me.BARAKAT Khulud HABANJAR Department of Physics Faculty of Science Alexandria University Alexandria Egypt Department of Physics Faculty of Science Beirut Arab University Beirut Lebanon

Co-precipitation method and conventional solid-state reaction technique were used to synthesize BaSnO3 nanoparticles and (BaSnO3)x/Bi1.6Pb0.4Sr2Ca2Cu3O10+δ (0≤x≤ 1.50w t％) samples,respectively.X-ray powder diffraction (XRD),scanning electron microscopy (SEM),and electrical resistivity data were used to characterize BiPb-2223 phase added by BaSnO3 *** relative volume fraction and superconducting transition temperature Tc of BiPb-2223 phase were enhanced by increasing BaSnO3 addition up to 0.50 wt％.These parameters were decreased with further increase of *** resistive transition broadening under different applied DC magnetic fields (0.29-4.40kG) was analyzed through thermally activated flux creep (TAFC) model and Ambegaokar-Halperin (AH) *** of the derived flux pinning energy U,critical current density Jc (0) estimated from AH parameter C(B),and upper critical magnetic field Bc2 (0),were recorded by adding BaSnO3 nanoparticles up to 0.50 wt％,beyond which these parameters were *** magnetic field dependence of the flux pinning energy and critical current density decreased as a power-law relation,which indicated the single junction sensitivity between the superconducting grains to the applied magnetic ***,the increase in the applied magnetic field did not affect the electronic thermal conductivity Ke above the superconducting transition temperature and suppressed it below Tc.

关键词： BiPb-2223 BaSnO3 nanoparticles flux pinning energy critical current density

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Dependency-aware unequal erasure protection codes

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第Z1期7卷 27-33页

作者： BOUABDALLAH Amine LACAN Jérme Laboratory for Analysis and Architecture of Systems Toulouse 31077 France Applied Mathematics and Computer Science DepartmentENSICAToulouse 31056France Telecommunications for Space and AeronauticToulouse 31000France

Classical unequal erasure protection schemes split data to be protected into classes which are encoded independently. The unequal protection scheme presented in this paper is based on an erasure code which encodes all the data together according to the existing dependencies. A simple algorithm generates dynamically the generator matrix of the erasure code according to the packets streams structure, i.e., the dependencies between the packets, and the rate of the code. This proposed erasure code was applied to a packetized MPEG4 stream transmitted over a packet erasure channel and compared with other classical protection schemes in terms of PSNR and MOS. It is shown that the proposed code allows keeping a high video quality-level in a larger packet loss rate range than the other protection schemes.

关键词： Data dependencies integration Unequal erasure protection (UEP) Lossy networks Reliable video transmissions MPEG4 video codec

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Massless and Massive Particle-in-a-Box States in Single- and Bi-Layer Graphene

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Nano Research 2011年第4期4卷 385-392页

作者： Sungjae cho Michael Fuhrer Department of Physics and Center for Nanophysics and Advanced Materials University of Maryland College Park Maryland 20742 USA

Electron transport through short, phase-coherent metal-graphene-metal devices occurs via resonant transmission through particle-in-a-box-like states defined by the atomically-sharp metal leads. We study the spectrum of particle-in-a-box states for single- and bi-layer graphene, corresponding to massless and massive two-dimensional （2-D） fermions. The density of states D as a function of particle number n shows the expected relationships D（n） -n1/2 for massless 2-D fermions （electrons in single-layer graphene） and D（n） -constant for massive 2-D fermions （electrons in bi-layer graphene）. The single parameters of the massless and massive dispersion relations are found, namely Fermi velocity vF = 1.1 × 10^6 m/s and effective mass m＊ = 0.032 me, where me, is the electron mass, in excellent agreement with theoretical expectations.

关键词： Fabry-Perot interference ballistic density of states phase-coherent

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A unified electrical model based on experimental data to describe electrical transport in carbon nanotube-based materials

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Nano Research 2020年第6期13卷 1764-1779页

作者： Yoann Dini Jérôme Faure-Vincent Jean Dijon Univ.Grenoble-Alpes CEALITENDTNMF-38000GrenobleFrance Univ.Grenoble-Alpes CEACNRSIRIGSyMMESF-38000GrenobleFrance

Understanding the electrical transport in carbon nanotube(CNT)materials is one key to reach very high electrical *** CNT material resistivity(ρ(T))as function of the temperature are fully apprehended by their reduced activation W(T)=dln(ρ)/dln(T)*** to now,no model accurately fits W(T)curves,thus preventing from precisely describing the CNT material electrical *** present a new electrical transport model that perfectly fits all W(T)curves found in the literature and in our own *** material resistivities are modeled byρ(T)=ρ0(T^−α+M(1+βTγT^2)).Our model has few enough parameters(α,M,β,γ)to relate them to the CNT *** 70 K,we experimentally show that CNT material resistivity follows the Luttinger Liquid theory justifying the T^−αterm in our *** 70 K,the polynomial part becomes dominant and depends on the two different CNT fabrication techniques which lead to two very different yarn *** yarns made from floating catalyst chemical vapor deposition CNTs,the polynomial is explained by the percolation of metallic CNT ***,the polynomial of yarns spun from CNT arrays is explained by the electrical transport in CNT bundles which are the basic building blocks of this type of yarns.

关键词： carbon nanotube carbon-based materials electrical conductivity electrical transport model Luttinger Liquid

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Ultralight Scalar and Axion Dark Matter Detection with Long-Baseline Atom Interferometers

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Chinese Physics Letters 2024年第12期41卷 240-245页

作者： Wei Zhao Hui Liu Xitong me Shandong University of Aeronautics Binzhou 256600China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Innovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan 430071China University of Chinese Academy of Sciences Beijing 100049China

Detecting dark matter remains one of the most challenging problems in modern *** propose a method to detect the coupling of ultralight scalar dark matter to quarks and gluons,as well as the coupling of ultralight axion dark matter to gluons,using long-baseline atom *** between ultralight scalar and axion dark matter with quarks and gluons can induce oscillations in nuclear charge radii,consequently causing oscillations in atomic transition *** calculate the differential phase shift produced by these dark matter interactions in long-baseline atom interferometers,presenting constraints on the scalar dark matter coupling parameters dg and d^m,as well as on the axion dark matter coupling parameter 1/*** results are anticipated to improve existing bounds and complement bounds from other experiments.

关键词： coupling scalar bounds

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