检索结果-南通市图书馆

journal of Magnesium and Alloys 2023年第6期11卷 2196-2204页

作者： b.j.Wang d.K.xu x.Q.Zhuang l.y.Sheng School of Environmental and chemical Engineering Shenyang Ligong UniversityShenyang110159China Key laboratory of nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China Peking university Shenzhen InstituteShenzhen Key Lab Human Tissue Regenerate&RepairShenzhen 518057China

In this work,the tensile behaviors of Mg-8%li and Mg-8%li-6%Zn-1.2%y alloys at ambient temperature were investigated and *** revealed that the plastic instability of Mg-8%li alloy was quite remarkable and the variation range of serrated flowing stress can reach5 *** the Mg-8%li-6%Zn-1.2%y alloy,the formation of I-phase(Mg_(3)Zn_(6)y)can simultaneously enhance the tensile strength and eliminate the plastic instability phenomenon,whilst its ductility was *** in-situ tensile tests revealed that for the Mg-8%li alloy,the severity and number of slip traces present in bothα-Mg andβ-li matrix phases increased remarkably with the applied tensile ***,slip traces were quite fine inβ-li matrix phase and could be clearly observed when the applied tensile strain exceeded 18%.due to the incompatibility of plastic deformation occurred in two matrix phases,the induced strain concentration atα-Mg/β-li interfaces caused their subsequent *** the Mg-8%-6%Zn-1.2%y alloy,the I-phase distributed atα-Mg/β-li interfaces suppressed the plastic deformation ofα-Mg matrix phase and the tensile strain was dominated by theβ-li matrix phase,resulting in the disappearance of plastic ***,the plastic strain would preferentially concentrate at I-phase/β-li interfaces and subsequently induced the cracking of I-phase.

关键词： Mg-li alloys Microstructure Plastic deformation basal slip cracking

diabetic peripheral neuropathy and neuromodulation techniques:a systematic review of progress and prospects

在线全文

学校读者我要写书评

暂无评论

neural Regeneration Research 2025年第8期20卷 2218-2230页

作者： Rahul Mittal Keelin McKenna Grant Keith Evan McKenna joana R.n.lemos jeenu Mittal Khemraj Hirani diabetes Research Institute University of Miami Miller School of MedicineMiamiFLUSA department of Otolaryngology University of Miami Miller School of MedicineMiamiFLUSA Herbert Wertheim college of Medicine Florida International UniversityMiamiFLUSA School of Medicine and Public Health University of WisconsinMadisonWIUSA

neuromodulation for diabetic peripheral neuropathy represents a significant area of interest in the management of chronic pain associated with this *** peripheral neuropathy,a common complication of diabetes,is characterized by nerve damage due to high blood sugar levels that lead to symptoms,such as pain,tingling,and numbness,primarily in the hands and *** aim of this systematic review was to evaluate the efficacy of neuromodulatory techniques as potential therapeutic interventions for patients with diabetic peripheral neuropathy,while also examining recent developments in this *** investigation encompassed an array of neuromodulation methods,including frequency rhythmic electrical modulated systems,dorsal root ganglion stimulation,and spinal cord *** systematic review suggests that neuromodulatory techniques may be useful in the treatment of diabetic peripheral *** the advantages of these treatments will enable physicians and other healthcare providers to offer additional options for patients with symptoms refractory to standard pharmacologic *** these efforts,we may improve quality of life and increase functional capacity in patients suffering from complications related to diabetic neuropathy.

关键词： diabetes mellitus diabetic peripheral neuropathy neuromodulation neurostimulation therapy non-pharmacological treatment pain management

FInITE ElEMEnT AnAlySIS OF VIScOuS FlOW PAST A ROTATInG SPHERE

在线全文

学校读者我要写书评

暂无评论

journal of Hydrodynamics 2001年第2期13卷 80-85页

作者： Wang, y.x. lu, x.y. Zhuang, l.x. dept. of Modern Mech. Univ. of Sci. and Technol. of China Hefei 230026 China

Viscous flow past a rotating sphere with a constant rotating speed about an axis aligned with the free stream was investigated numerically by solving the three-dimensional navier-Stokes equations using the finite element method. To elucidate the character of this flow in the near wake, the flow structures at different Reynolds numbers and rotating speeds are examined. The axisymmetric and non-axisymmetric flow structures were observed at Re=200 and 250, respectively, which rotate as a whole around the rotating axis steadily. At Re=300, the vortex shedding appears and the wake becomes more complicated. At low rotating speeds, the flow is dominated by the vortex shedding at higher Reynolds numbers. As the rotating speed increases, the rotating effect gets stronger and the interaction between the rotating action and the vortex shedding results a swirling vortex pattern in the near wake of the sphere.

关键词： Finite element method navier Stokes equations numerical methods Three dimensional

RATIOnAl GEnERAl SOluTIOnS OF HIGHER ORdER AlGEbRAIc OdES

在线全文

学校读者我要写书评

暂无评论

journal of Systems Science & complexity 2013年第2期26卷 261-280页

作者： HuAnG yanli nG l x chu WInKlER Franz School of computer Science and Software Engineering Tianjin Polytechnic University Research Institute for Symbolic computation(RISc) Johannes Kepler University department of Mathematics Quy Nhon University

This paper generalizes the method of ng6 and Winkler （2010, 2011） for finding rational general solutions of a first order non-autonomous algebraic ordinary differential equation （AOdE） to the case of a higher order AOdE, provided a proper parametrization of its solution hypersurface. The authors reduce the problem of finding the rational general solution of a higher order AOdE to finding the rational general solution of an associated system. The rational general solutions of the original AOdE and its associated system are in computable 1-1 correspondence. The authors give necessary and sufficient conditions for the associated system to have a rational solution based on proper reparametrization of invariant algebraic space curves. The authors also relate invariant space curves to first integrals and characterize rationally solvable systems by rational first integrals.

关键词： Algebraic OdE associated system invariant algebraic space curve rational first integral rational general solution.

leveraging ROTI map derived from Indonesian GnSS receiver network for advancing study of Equatorial Plasma bubble in Southeast/East Asia

在线全文

学校读者我要写书评

暂无评论

Earth and Planetary Physics 2025年第1期9卷 101-116页

作者： Prayitno Abadi Ihsan n.Muafiry Teguh n.Pratama Angga y.Putra Suraina Gatot H.Pramono Sidik T.Wibowo Febrylian F.chabibi umar A.Ahmad Wildan P.Tresna Asnawi Research center for climate and Atmosphere Indonesian National Research and Innovation Agency(BRIN)BandungIndonesia School of Electrical Engineering Telkom UniversityBandungIndonesia directorate of laboratory Management Facilities and Science and Technology Park Indonesian National Research and Innovation Agency(BRIN)PontianakIndonesia Geophysics laboratory Master Program in PhysicsUniversitas Gadjah Mada(UGM)YogyakartaIndonesia Research center for Space Indonesian National Research and Innovation Agency(BRIN)BandungIndonesia Indonesian Geospatial Information Agency(bIG) JakartaIndonesia Research center for Photonics Indonesian National Research and Innovation Agency(BRIN)Tangerang SelatanIndonesia department of Earth and Planetary Sciences Hokkaido UniversitySapporoJapan

This paper highlights the crucial role of Indonesia’s GnSS receiver network in advancing Equatorial Plasma bubble(EPb)studies in Southeast and East Asia,as ionospheric irregularities within EPb can disrupt GnSS signals and degrade positioning *** by the Indonesian Geospatial Information Agency(bIG),the Indonesia continuously Operating Reference Station(Ina-cORS)network comprises over 300 GnSS receivers spanning equatorial to southern low-latitude ***-cORS is uniquely situated to monitor EPb generation,zonal drift,and dissipation across Southeast *** provide a practical tool for EPb research,by sharing two-dimensional rate of Total Electron content(TEc)change index(ROTI)derived from this *** generate ROTI maps with a 10-minute resolution,and samples from May 2024 are publicly available for further scientific *** preliminary findings from the ROTI maps of Ina-cORS are ***,the Ina-cORS ROTI maps reveal that the irregularities within a broader EPb structure persist longer,increasing the potential for these irregularities to migrate farther ***,we demonstrate that combined ROTI maps from Ina-cORS and GnSS receivers in East Asia and Australia can be used to monitor the development of ionospheric irregularities in Southeast and East *** have demonstrated the combined ROTI maps to capture the development of ionospheric irregularities in the Southeast/East Asian sector during the G5 Geomagnetic Storm on May 11,*** observed simultaneous ionospheric irregularities in japan and Australia,respectively propagating northwestward and southwestward,before midnight,whereas Southeast Asia’s equatorial and low-latitude regions exhibited irregularities *** sharing ROTI maps from Indonesia and integrating them with regional GnSS networks,researchers can conduct comprehensive EPb studies,enhancing the understanding of EPb behavior across Southeast and East Asia and contributing significantly to ionosphe

关键词： Equatorial Plasma bubble(EPb) GnSS receivers’network Indonesia continuously Operating Reference Station(Ina-cORS) ionospheric map Rate of TEc change index(ROTI)map

Anisotropic Inter-granular corrosion behaviors and Microstructures of AlMgSicu Alloy Sheets Made by Thermal–Mechanical Treatments

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English letters) 2022年第2期35卷 275-284页

作者： l.M.liu y.x.lai c.l.Wu Z.Zhang j.H.chen center for High-Resolution Electron Microscopy College of Materials Science and EngineeringHunan UniversityChangsha 410082China

This study investigates the microstructure and local corrosion behavior of an Al-Mg-Si-cu alloy,which has been subjected to cold-rolling with different deformation strain ratios(dSRs)and followed by artificial *** corrosion tests show that peak-aged samples with a small dSR(5-10%)are sensitive to inter-granular corrosion(IGc)along both the normal and rolling *** the dSR increases to medium strength(20-40%),IGc sensitivity decreases along both directions and corrosion propagates *** the dSR is 60-80%,IGc sensitivity along the normal direction continues to decrease,but increases along the rolling direction,indicating pronounced corrosion *** characterization reveals the decreased IGc sensitivity is mainly attributed to a reduction in element segregation at high-angle grain boundaries and the kinked and discontinuous grain boundary corrosion *** increased IGc sensitivity along the rolling direction could be related to the significantly flattened grains.

关键词： Al alloys local corrosion Anisotropy Transmission electron microscopy(TEM) Electron backscattering diffraction(EbSd)

A theoretical investigation of the band alignment of type-I direct band gap dilute nitride phosphide alloy of Gan_xAs_yP_(1-x-y)/GaP quantum wells on GaP substrates

在线全文

学校读者我要写书评

暂无评论

chinese Physics b 2014年第7期23卷 640-644页

作者： O l nsal b Gnül M Temiz department of Engineering Physics University of Gaziantep

The GaP-based dilute nitride direct band gap material Ga（nAsP） is gaining importance due to the monolithic integra- tion of laser diodes on Si microprocessors. The major advantage of this newly proposed laser material system is the small lattice mismatch between GaP and Si. However, the large threshold current density of these promising laser diodes on Si substrates shows that the carrier leakage plays an important role in Ga（nAsP）/GaP QW lasers. Therefore, it is necessary to investigate the band alignment in this laser material system. In this paper, we present a theoretical investigation to optimize the band alignment of type-I direct band gap GanxAsyP1-x-y/GaP QWs on GaP substrates. We examine the effect of nitrogen （n） concentration on the band offset ratios and band offset energies. We also provide a comparison of the band alignment of type-I direct band gap GanxAsyP1-x-y/GaP QWs with that of the GanxAsyP1-x-y/Al2Ga1-2P QWs on GaP substrates. Our theoretical calculations indicate that the incorporations of n into the well and AI into the barrier improve the band alignment compared to that of the GaAsP/GaP QW laser heterostructures.

关键词： quantum well band alignment carrier confinement dilute nitride phosphide alloy

Reduction effect of final-pass heavy reduction rolling on the texture development,tensile property and stretch formability of ZWK100 alloy plates

在线全文

学校读者我要写书评

暂无评论

journal of Materials Science & Technology 2022年第16期111卷 211-223页

作者： b.Q.Shi l.y.Zhao x.l.Shang b.H.nie d.c.chen c.Q.li y.Q.cheng School of Materials Science and Hydrogen Energy Foshan UniversityFoshan 528000China School of Materials and Energy Guangdong University of TechnologyGuangzhouGuangdong 510006China Gd Midea Air-conditioning Equipment co. Ltd.Foshan 528311China Guangdong Key laboratory of Hydrogen Energy Technology Foshan 528000China yunFu(Foshan)R&d center of Hydrogen Energy Standardization Yunfu 527326China

Obviously planar anisotropy due to‘Td split’orthotropic texture(Td indicates Transverse direction)always exist in the Rare-earth(RE)or ca containing Mg alloy sheets,which is likely caused by the lowreduction rolling(and annealing)as revealed in our previous *** this work,the as-cast billets of a ZWK100 alloy were subjected to final-pass heavy reduction rolling(FHRR)at 500°c with different reductions(30%-70%)after rough rolling,aiming to investigate the reduction effect on the microstructure and texture *** results show that FHRR with higher reductions above 50%is in favor of shear banding formation but has little effect on the as-deformed texture components,and the excellent formability with single-pass reduction up to 70%is mainly ascribed to the activation of prismatic *** with reduction above 50%and annealing can generate uniform grain structures of~10μm and symmetrical‘oblique-line split’texture in(0001)pole figures,with basal poles tilting by about 50°from nd(normal direction)towards some oblique-line of Td and Rd(Rolling direction)as well as uniform distribution of counter lines as an annular shape,resulting in excellent elongation to failure of~50%and ultra-low planar anisotropyΔr_of~0.1 and high stretch formability(Erichsen value:8.1).The formation‘oblique-line split’texture in(0001)pole figures is mainly correlated with the preferred growth tendency of grains with■//Rd,which was suggested to relate to the high mobility of some special boundaries such as 40°-45°■.The influences of starting textures on the mechanical properties,planar anisotropy and related deformation modes,as well as their correlations with the stretch formability were comparatively investigated with the‘Td split’orthotropic texture as a counterpoint.

关键词： Magnesium alloys Texture Plane anisotropy Stretch formability Rolled sheets

Spectral and Timing Analysis of the black Hole Transient MAxI j1631–479 during its 2019 Outburst Observed with Insight-HxMT

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2022年第11期22卷 21-33页

作者： yu-cong Fu l.M.Song G.Q.ding S.n.Zhang j.l.Qu S.Zhang l.Zhang Q.c.bu y.Huang x.Ma Z.x.yang y.l.Tuo x.F.lu d.K.Zhou b.y.Wu T.M.li y.c.xu xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqiXinjiang 830011China university of chinese Academy of Sciences Chinese Academy of SciencesBeijing 100049China Key laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Institut fur Astronomie und Astrophysik Kepler Center for Astro and Particle PhysicsEberhard Karls UniversitatSand 1D-72076 TübingenGermany

We report spectral and timing analysis of the black hole transient MAxI j1631–479 during the hard intermediate state of its 2019 outburst from the Insight-Hard x-ray Modulation Telescope(Insight-HxMT)*** find that the energy dependence of the type-c quasi-periodic oscillation(QPO)frequency evolves with time:during the initial rise of a small flare(~Mjd 58526.0-58527.1),the QPO frequency increases with increasing energy from~1 to~100 ke V,and then the frequency remains constant after Mjd *** discover a possible new phenomenon of Fe line’s QPO frequency jump that has never been observed for other black hole transients:during the small flare,the QPO frequency around the Fe line energy is higher than any other energy band,with the frequency difference Δf=0.25±0.08 Hz between 5.5–7.5 ke V and other energy *** spectral analysis shows that the evolution of QPOs is related to the equivalent width of the narrow Fe line,and its equivalent width increases during this small *** propose that the QPO frequency difference results from the differential precession of a vertically extended jet,and the higher QPO frequency of Fe line could be caused by the layered jet when the jet scale *** the same time,the evolution of QPOs is related to the accretion rate,while the energy dependence of QPOs supports the existence of deceleration in the vertically distributed jet.

关键词： accretion accretion disks stars:black holes x-rays:binaries

Active metal brazing of SiO2–bn ceramic and Ti plate with Ag–cu–Ti＋bn composite filler

在线全文

学校读者我要写书评

暂无评论

journal of Materials Science & Technology 2017年第11期33卷 1392-1401页

作者： Z.W.yang c.l.Wang y.Wang l.x.Zhang d.P.Wang j.c.Feng Tianjin Key lab of Advanced joining Technology School of Materials Science and Engineering Tianjin University Tianjin 300072 China State Key lab of Advanced Welding andjoining Harbin Institute of Technology Harbin 150001 China

SiO2–bn ceramic and Ti plate were joined by active brazing in vacuum with Ag–cu–Ti＋bn composite *** effect of bn content,brazing temperature and time on the microstructure and mechanical properties of the brazed joints was *** results showed that a continuous Ti n–Ti b2reaction layer formed adjacent to the SiO2–bn ceramic,whose thickness played a key role in the bonding *** Ti–cu compound layers,Ti2cu,Ti3cu4,Ti cu2and Ti cu4,were observed to border Ti substrate due to the strong affinity of Ti and cu compared with *** central part of the joint was composed of Ag matrix,over which some fine-grains *** added bn particles reacted with Ti in the liquid filler to form fine Ti b whiskers and Ti n particles with low coefficients of thermal expansion（cTE）,leading to the reduction of detrimental residual stress in the joint,and thus improving the joint *** maximum shear strength of 31 MPa was obtained when 3 wt%bn was added in the composite filler,which was 158%higher than that brazed with single Ag–cu–Ti filler *** morphology and thickness of the reaction layer adjacent to the parent materials changed correspondingly with the increase of bn content,brazing temperature and holding *** on the correlation between the microstructural evolution and brazing parameters,the bonding mechanism of SiO2–bn and Ti was discussed.

关键词： SiO2–bn ceramic bn particles Microstructure Mechanical properties