检索结果-南通市图书馆

Computers, Materials & Continua 2016年第4期52卷 41-52页

作者： S.A.yıldızel A.u.Öztürk Manisa Celal Bayar university Engineering FacultyTurkey

In this study,artificial neural networks trained with swarm based artificial bee colony optimization algorithm was implemented for prediction of the modulus of rapture values of the fabricated glass fiber reinforced concrete *** the application of the ANN models,143 different four-point bending test results of glass fiber reinforced concrete mixes with the varied parameters of temperature,fiber content and slump values were introduced the artificial bee colony optimization and conventional back propagation *** and the testing results of the corresponding models showed that artificial neural networks trained with the artificial bee colony optimization algorithm have remarkable potential for the prediction of modulus of rupture values and this method can be used as a preliminary decision criterion for quality check of the fabricated products.

关键词： Neural network glass fiber reinforced concrete glass fiber

Effectiveness of heat and mass transfer on mixed convective peristaltic motion of nanofluid with irreversibility rate

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2021年第10期73卷 36-46页

作者： y Akbar F M Abbasi u M Zahid S A Shehzad Department of Mathematics COMSATS University IslamabadIslamabadPakistan Department of Mathematics COMSATS University IslamabadSahiwalPakistan

Entropy generation is one of the key features in analysis as it exhibits irreversibility of the system. Therefore, the present study investigates the entropy generation rate in a mixed convective peristaltic motion of a reactive nanofluid through an asymmetrical divergent channel with heat and mass transfer characteristics. The endorsed nanofluid model holds thermophoresis and Brownian diffusions. Mathematical modeling is configured under the effects of mixed convection, heat generation/absorption and viscous dissipation. A chemical reaction is also introduced for the description of mass transportation. The resulting system of differential equations is numerically tackled by employing the Shooting method. The findings reveal that entropy generation rises by improving the Brownian motion and thermophoresis parameters. The temperature of the nanofluid decreases due to rising buoyancy forces caused by the concentration gradient. The concentration profile increases by increasing the chemical reaction parameter. The velocity increases by enhancing the Brownian motion parameter.

关键词： peristaltic flow thermophoresis and Brownian motion mixed convection chemical reaction irreversibility nanofluid

Co^(2+) substituted Mg–Cu–Zn ferrite: Evaluation of structural,magnetic,and electromagnetic properties

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2018年第3期7卷 207-217页

作者： l.M.THORAT J.y.PATIl D.y.NADARGI u.R.GHODAkE R.C.kAMBAlE S.S.SuRyAVANSHI Department of Electronics S.M.Dnyandeo Mohekar Mahavidyalaya School of Physical Sciences Solapur University Department of Electronics Shri Shivaji Mahavidyalaya Department of Physics Savitribai Phule Pune University

We report the synthesis of Co^(2+)substituted Mg–Cu–Zn ferrite via citrate gel combustion process and thereby its structural,transport,and magnetic properties for the use in electromagnetic energy absorption *** polycrystalline ferrite system is investigated by interplay of stoichiometric composition with Mg_(0.25–x)Co_x Cu_(0.25)Zn_(0.5)Fe_2O_4(0≤x≤0.25).Structural investigations using X-ray diffraction(XRD)and selected area electron diffraction(SAED)reveal the formation of spinel structure with linear growth of lattice constant due to Co^(2+)*** microstructural analysis(TEM and SEM)depicts the dense microstructure with the average grain size of 0.42–1.25μ*** elemental analysis(EDS)confirms the elemental composition of the as-prepared ferrite with respect to the initial concentrations of the synthetic composition *** observed variations in initial permeability(μ_i)and magnetic moment(_Bn)are explained based on deviation in saturation magnetization(M_s),anisotropy constant(_1k),density values,and exchange *** temperature dependence of DC resistivity confirms the semiconducting behavior of the as-prepared ferrite material,with an increase in the DC resistivity by an incorporation of ***,the effects of adding Co^(2+)on the Curie temperature,frequency dependent dielectric properties of the ferrite material are also discussed.

关键词： Co-Mg-Cu-Zn ferrite spinel phase electrical resistivity saturation magnetization anisotropy constant Curie temperature

Corrosion behavior of Mg-Gd-Zn based alloys in aqueous NaCl solution

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2014年第3期2卷 245-256页

作者： A.Srinivasan C.Blawert y.Huang C.l.Mendis k.u.kainer N.Hort Helmholtz-Zentrum GeesthachtInstitute of Materials ResearchMax-Planck-Str.121502 GeesthachtGermany CSIR-National Institute for Interdisciplinary Science and Technology Pappanamcode(P.O)Thiruvananthapuram 695019India

The corrosion behavior of Mg-10Gd-xZn(x=2,6 wt.%)alloys in 0.5 wt.%NaCl solution was *** of both the alloys consisted of(Mg,Zn)_(3) Gd phase and lamellar long period stacking ordered(lPSO)*** morphology of the second phase at the grain boundary differed in both alloys:it was a continuous network structure in Mg-10Gd-6Zn,whereas it was relatively discrete in *** dendrites were finer in size and highly branched in *** corrosion results indicated that the increase in Zn content increased the corrosion rate in Mg-10Gd-xZn ***-galvanic corrosion occurred near the grain boundary in both alloys initially as the grain boundary phase was stable and acted as a cathode,however,filiform corrosion dominated in the later stage,which was facilitated by the lPSO phase in the *** micro-galvanic corrosion occurred in Mg-10Gd-6Zn due to the higher volume of second *** stability of the second phase at the grain boundary was altered and dissolved after the long immersion *** the NaCl solution chemically reacted with the grain boundary phase and de-stabilized it during the long immersion times,and was removed by the chromic acid used for the corrosion product removal.

关键词： Mg-Gd-Zn alloys Micro-galvanic corrosion Polarization Electrochemical characterization

Relationship between the fatigue behavior and grain structures of an as-extruded Mg-6.2%Zn-0.6%Zr(in wt.%)alloy

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第18期149卷 119-126页

作者： B.J.Wang D.k.Xu C.l.Jiang l.y.Sheng E.H.Han School of Environmental and Chemical Engineering Shenyang Ligong UniversityShenyang 110159China key laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Binzhou Institute of Technology Binzhou 256606China Shandong key laboratory of Advanced Aluminium Materials and Technology Binzhou 256606China Shenzhen Institute Shenzhen Key Lab Human Tissue Regenerate&RepairPeking UniversityShenzhen 518057China

Through investigating the tension-tension fatigue behavior of an as-extruded Mg-6.2 wt.%Zn-0.6 wt.%Zr(Zk60)alloy,it revealed that the determined fatigue strength at 107 cycles was quite sensitive to the grain *** them,the fine grain structure had the highest fatigue strength of 130 MPa,whereas the typical“bi-modal”grain structure had the lowest fatigue strength of 110 *** analysis demon-strated that for the fine grain structure,fatigue cracks preferentially nucleated at grain *** the“bi-modal”and coarse grain structures,the fatigue crack initiation was dominated by the cracking along slip bands.

关键词： Mg alloys Grain structure Cyclic slips Fatigue behavior Crack initiation

Analysis of vibrational spectra of nano-bio molecules: Application to metalloporphrins

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2013年第9期22卷 225-232页

作者： k Srinivasa Rao G Srinivas J.Vijayasekhar V.u.M.Rao y.Srinivas k.Sunil Babu V.Sunndadara Siva kumar A.Hanumaiah Department of Electronics & Instrumentation Engineering Lakireddy Bali Reddy College of Engineering Department of Physics KL University Research Scholar Department of MathematicsJawaharlal Nehru Technological University Department of Applied Mathematics College of Science & TechnologyAndhra University Department of Computer Science GITAM University Department of Physics Miracle Engineering College Department of Electronics & Instrumentation Rajeev Gandhi Memorial Engineering College Department of Physics Lara's Vignan Institute of Technology and Science

In this paper, we have applied the lie algebraic model to nano-bio molecules to determine the vibrational spectra of different stretching and bending vibrational modes. The determined vibrational energy levels by the lie algebraic model are compared with the experimental data. The results from the theoretical mode[ are consistent with the experimental data. The vibrational energy levels are clustering in the excited states.

关键词： lie algebraic model vibrational spectra vibrational modes metalloporphyrins

Inhibiting effect of I-phase formation on the plastic instability of the duplex structured Mg-8li-6Zn-1.2y(in wt.%)alloy

在线全文

学校读者我要写书评

暂无评论

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

Hybrid-Vlasov simulation of soft X-ray emissions at the Earth’s dayside magnetospheric boundaries

在线全文

学校读者我要写书评

暂无评论

Earth and Planetary Physics 2024年第1期8卷 70-88页

作者： M.Grandin H.k.Connor S.Hoilijoki M.Battarbee y.Pfau-kempf u.Ganse k.Papadakis M.Palmroth Department of Physics University of HelsinkiHelsinkiFinland NASA Goddard Space Flight Center GreenbeltMD20771USA Space and Earth Observation Centre Finnish Meteorological InstituteHelsinkiFinland

Solar wind charge exchange produces emissions in the soft X-ray energy range which can enable the study of near-Earth space regions such as the magnetopause,the magnetosheath and the polar cusps by remote sensing *** Solar wind Magnetosphere Ionosphere link Explorer(SMIlE)and lunar Environment heliospheric X-ray Imager(lEXI)missions aim to obtain soft Xray images of near-Earth space thanks to their Soft X-ray Imager(SXI)*** earlier modeling works have already simulated soft X-ray images as might be obtained by SMIlE SXI during its mission,the numerical models used so far are all based on the magnetohydrodynamics description of the space *** investigate the possible signatures of ion-kinetic-scale processes in soft Xray images,we use for the first time a global hybrid-Vlasov simulation of the geospace from the Vlasiator *** simulation is driven by fast and tenuous solar wind conditions and purely southward interplanetary magnetic *** first produce global X-ray images of the dayside near-Earth space by placing a virtual imaging satellite at two different locations,providing meridional and equatorial *** then analyze regional features present in the images and show that they correspond to signatures in soft X-ray emissions of mirrormode wave structures in the magnetosheath and flux transfer events(FTEs)at the *** results suggest that,although the time scales associated with the motion of those transient phenomena will likely be significantly smaller than the integration time of the SMIlE and lEXI imagers,mirror-mode structures and FTEs can cumulatively produce detectable signatures in the soft X-ray *** instance,a local increase by 30%in the proton density at the dayside magnetopause resulting from the transit of multiple FTEs leads to a 12%enhancement in the line-of-sight-and time-integrated soft X-ray emissivity originating from this ***,a proton density increase by 14%in the magnetosheath

关键词： magnetosphere magnetosheath numerical simulation SMIlE lEXI soft X-ray emissions hybrid-Vlasov model polar cusp flux transfer events mirror-mode waves

Resonant production of color octet muons at Future Circular Collider-based muon-proton colliders

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2018年第8期42卷 99-107页

作者： y.C.Acar u.kaya B.B.Oner Department of Material Science and Nanotechnology TOBB University of Economics and Technology Department of Physics Ankara University

We investigate the resonant production of color octet muons in order to explore the discovery potential of Future Circular Collider（FCC）-based μp *** is shown that the search potentials of μp colliders essentially... 详细信息

关键词： leptogluons lepton-hadron interactions composite models muon-proton colliders color octet muon,beyond the standard model

FuRTHER INVESTIGATION INTO APPROXIMATION OF A COMMON SOluTION OF FIXED POINT PROBlEMS AND SPlIT FEASIBIlITy PROBlEMS

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2016年第3期36卷 913-930页

作者： y.SHEHu O.T.MEWOMO F.u.OGBuISI Department of Mathematics University of Nigeria School of Mathematics Statistics and Computer ScienceUniversity of Kwazulu-Natal

The purpose of this paper is to study and analyze an iterative method for finding a common element of the solution set ~ of the split feasibility problem and the set F（T） of fixed points of a right Bregman strongly nonexpansive mapping T in the setting of p- uniformly convex Banach spaces which are also uniformly smooth. By combining Mann＇s iterative method and the Halpern＇s approximation method, we propose an iterative algorithm for finding an element of the set F（T）∩Ω moreover, we derive the strong convergence of the proposed algorithm under appropriate conditions and give numerical results to verify the efficiency and implementation of our method. Our results extend and complement many known related results in the literature.

关键词： strong convergence split feasibility problem uniformly convex uniformly smooth fixed point problem right Bregman strongly nonexpansive mappings