检索结果-南通市图书馆

does acid pickling of m.-Ca alloy enhance biom.neralization?

在线全文

学校读者我要写书评

暂无评论

Journal of m.gnesium.and Alloys 2021年第3期9卷 1028-1038页

作者： Shebeer A Rahim.VP m.ham.ad Rabeeh m.A Joseph T Hanas departm.nt of m.chanical Engineering National Institute of Technology CalicutKerala 673601India Nanom.terials Research Laboratory School of Materials Science and EngineeringNational Institute of Technology CalicutKerala 673601India

The m.chanical and physical properties of biodegradable m.gnesium.m.)alloys m.ke them.suitable for tem.orary orthopaedic *** success of these alloys depends on their perform.nce in the physiological *** the present work,surface m.dification of m.-Ca binary alloy by acid pickling for better biom.neralization and controlled biodegradation is *** corrosion rates of nitric and phosphoric acid treated sam.les were analysed by conducting electrochem.cal corrosion *** vitro degradation behaviour was studied using im.ersion test in sim.lated body fluid(SBF).The sam.le surfaces were characterized using scanning electron m.croscope(SEm.,energy dispersive X-ray spectroscopy(EdS),Fourier transform.infrared spectroscopy(FTIR)and X-ray photoelectron spectroscopy(XPS).It is seen that acid pickling leads to significant im.rovem.nt in biom.neralization and develop in situ calcium.phosphate(Ca P)coating on the sam.le *** addition,the treated sam.les recorded a reduced degradation rate in the SBF com.ared to untreated ***,acid pickling is suggested as an effective surface treatm.nt m.thod to tailor the biom.neralization and degradation behaviour of the m.-Ca alloy in the physiological environm.nt.

关键词： Inorganic acid pickling m.gnesium.alloy Surface pretreatm.nt Surface characterization Biom.neralization degradation rate

Evolution of m.crostructure and texture in copper during repetitive extrusion-upsetting and subsequent annealing

在线全文

学校读者我要写书评

暂无评论

Journal of m.terials Science & Technology 2017年第7期33卷 690-697页

作者： Q.Chen d.Y.Shu J.Lin Y.Wu X.S.Xia S.H.Huang Z.d.Zhao O.V.m.shin G.L.Wu State Key Laboratory of m.chanical Transm.ssion Chongqing University Chongqing 400044 China

The evolution of the m.crostructure and texture in copper has been studied during repetitive extrusionupsetting（REU） to a total von m.ses strain of 4.7 and during subsequent annealing at different tem.eratures. It is found that the texture is significantly altered by each deform.tion pass. A duplex 001 ＋ 111 fiber texture with an increased 111 com.onent is observed after each extrusion pass,whereas the 110 fiber com.onent dom.nates the texture after each upsetting pass. during REU, the m.crostructure is refined by deform.tion-induced boundaries. The average cell size after a total strain of 4.7 is m.asured to be ~0.3 μm. This refined m.crostructure is unstable at room.tem.erature as is evident from.the presence of a sm.ll num.er of recrystallized grains in the deform.d m.trix. Pronounced recrystallization took place during annealing at 200？C for 1 h with recrystallized grains developing predom.nantly in high m.sorientation regions. At 350？C the m.crostructure is fully recrystallized with an average grain size of only 2.3 μm.and a very weak crystallographic texture. This REU-processed and subsequently annealed m.terial is considered to be potentially suitable for using as a m.terial for sputtering targets.

关键词： Severe plastic deform.tion Repetitive extrusion-upsetting Copper deform.tion m.crostructure Texture Annealing

Generation of linear and nonlinear waves in num.rical wave tank using clustering technique-volum. of fluid m.thod

在线全文

学校读者我要写书评

暂无评论

Applied m.them.tics and m.chanics(English Edition) 2012年第9期33卷 1179-1190页

作者： H.SAGHI m.J.KETABdARI S.BOOSHI departm.nt of Civil Engineering Ferdowsi UniversityMashhad 91779-4897Iran Faculty of m.rine Technology Amirkabir University of TechnologyTehran 15875-4413Iran

A two-dim.nsional （2d） num.rical m.del is developed for the wave sim. ulation and propagation in a wave flum.. The fluid flow is assum.d to be viscous and incom.ressible, and the Navier-Stokes and continuity equations are used as the governing equations. The standard k-e m.del is used to m.del the turbulent flow. The Navier- Stokes equations are discretized using the staggered grid finite difference m.thod and solved by the sim.lified m.rker and cell （Sm.C） m.thod. Waves are generated and propagated using a piston type wave m.ker. An open boundary condition is used at the end of the num.rical flum.. Som. standard tests, such as the lid-driven cavity, the constant unidirectional velocity field, the shearing flow, and the dam.break on the dry bed, are perform.d to valid the m.del. To dem.nstrate the capability and accuracy of the present m.thod, the results of generated waves are com.ared with available wave theories. Finally, the clustering technique （CT） is used for the m.sh generation, and the best condition is suggested.

关键词： num.rical wave tank free surface sim.lation Navier-Stokes equation stag-gered grid clustering technique (CT) wave generation

Extruded Corn m.al as a Partial Replacem.nt for Steam.Flaked Corn in Finishing diets for Feedlot Cattle: Growth Perform.nce and digestive Function of Feedlot Cattle

在线全文

学校读者我要写书评

暂无评论

Open Journal of Anim.l Sciences 2019年第2期9卷 196-206页

作者： L. Buenabad A. Y. Jacinto m. m.ntano R. A. Zinn departm.nt of Nutrition and Biotechnology of Rum.nats Instituto de Investigaciones en Ciencias Veterinarias Universidad Autónoma de Baja California Mexicali Mexico departm.nt of Anim.l Science University of California Davis USA

Sixty-four Holstein steers (247 ± 4 kg) were used in a 70-d experim.nt to evaluate the effects of partial replacem.nt of steam.flake corn (SFC) with extruded corn m.al (EC) on growth perform.nce and dietary net energy. Treatm.nts consisted of a steam.flaked corn-based finishing diet containing 0%, 10%, 20%, or 30% EC, where EC replaced 0%, 15%, 30%, or 45% of SFC (dm.basis). Replacem.nt of SFC with increasing levels of EC did not affect (P > 0.10) AdG, dm., and gain efficiency. When EC replaced 15% to 30% of SFC, observed dietary NE was 99% of expected. Whereas, when EC replaced 45% of SFC, observed dietary NE was 94% of expected. Four Holstein steers (210 ± 7 kg) with cannulas in the rum.n and proxim.l duodenum.were used in a 4 × 4 Latin square experim.nt to evaluate treatm.nt effects on characteristics of digestion. Partial replacem.nt of SFC with EC did not affect (P > 0.10) flow of undegraded feed N and m.crobial N and to the sm.ll intestine, and rum.nal m.crobial N efficiency (g m.crobial N/kg Om.ferm.nted). Likewise, there were no treatm.nt effects (P > 0.10) on rum.nal digestion of Om. NdF, starch and feed N. As expected, total tract digestion of starch for all treatm.nts exceeded 99%. However, partial replacem.nt of SFC with EC decreased total tract digestion of dm.and Om.(linear effect, P = 0.02), and dietary dE (linear effect, P = 0.03). These effects were m.re pronounced where EC replaced 45% of SFC. Partial replacem.nt of SFC with EC did not affect (P > 0.10) rum.nal pH, total VFA concentration, m.lar proportions of acetate, propionate, and butyrate, and estim.ted m.thane production. It is concluded that partial replacem.nt of SFC with EC does not have a beneficial effect on rum.nal m.crobial efficiency and digestive function. The feeding value of extruded corn for feedlot cattle is com.arable to that of steam.flaked corn provided the inclusion rate does not exceed 20% of diet dry m.tter.

关键词： Corn Grain Extruded Steam Flaked Feedlot Cattle

Study of the process e^+e^- →π^+π^-π~0π~0 at energies s～(1/2)<1 GeV

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 C 2010年第6期34卷 680-685页

作者： m.N.Achasov K.I.Beloborodov A.V.Berdyugin A.A.Botov V.B.Golubev T.V.dim.va V.P.druzhinin L.V.Kardapoltsev A.G.Kharlam.v d.P.Kovrizhin I.A.Koop A.A.Korol S.V.Koshuba A.E.Obrazovsky E.V.Pakhtusova d.A.Shtol S.I.Serednyakov Z.K.Silagadze A.N.Skrinsky Yu.A.Tikhonov Yu.m.Shatunov A.V.Vasil'ev Budker Institute of Nuclear Physics Russian Academy of Sciences Novosibirsk State University

In an experim.nt with the Spherical Neutral detector at VEPP-2m.collider the cross section of the process e^＋e^- →π^＋π^-π^0π^0 was m.asured. At energies √s 〈 920 m.V this cross section was m.asured for the first tim.. The energy dependence of the cross section is well discribed by the vector dom.nance m.del with contributions from.p, p＇, p＂ m.sons. The decay probability ρ→π^＋π^-π^0π^0 was found to be Bρ = （1.60±0.74±0.18） × 10^-5. The upper lim.t for the decay ω→π^＋π^-π^0π^0 was im.roved by two orders of m.gnitude com.ared to the previous m.asurem.nts and is Bω 〈 2 × 10^-4 at 90% confidence level.

关键词： VEPP-2m spherical neutral detector m.son decay

Overcom.ng the strength-ductility trade-off by tailoring grain-boundary m.tastable Si-containing phase in β-type titanium.alloy

在线全文

学校读者我要写书评

暂无评论

Journal of m.terials Science & Technology 2021年第9期68卷 112-123页

作者： X.Luo L.H.Liu C.Yang H.Z Lu H.W.m. Z.Wang d.d.Li L.C.Zhang Y.Y.Li National Engineering Research Center of Near-net-shape Form.ng for m.tallic m.terials South China University of TechnologyGuangzhou510640China State Key Laboratory of m.terials Processing and die&m.uld Technology Huazhong University of Science and TechnologyWuhan430074China Key Laboratory of Autom.bile m.terials of m.E Department of Materials ScienceJilin UniversityChangchun130012China School of Engineering Edith Cowan University270Joondalup DriveJoondalupPerthWA 6027Australia

It is well accepted that grain-boundary phases in m.tallic alloys greatly deteriorate the m.chanical *** our work,we report on a novel strategy to prepare high strength-ductility β-type(Ti69.71 Nb23.72Zr4.83Ta1.74)97Si3(at.%)(TNZTS) alloys by tailoring grain-boundary m.tastable Si-containing ***,the thin shell-shaped m.tastable S1 phase surrounding the colum.ar β-Ti grain was intercepted successfully via nonequilibrium.rapid solidification achieved by selective laser m.lting(SLm..Subsequently,the thin shell-shaped m.tastable(Ti,Nb,Zr)5 Si3(called S1) phase was transform.d into globular(Ti,Nb,Zr)2 Si(called S2) phase by the solution heat ***,the globular S2 phases reinforced TNZTS alloy exhibits ultrahigh yield strength of 978 m.a,ultim.te strength of 1010 m.a and large elongation of 10.4 %,overcom.ng the strength-ductility trade-off of TNZTS alloys by various ***,the reported yield strength herein is 55 % higher than that of conventionally forged TNZT *** analysis indicates the globularization process of the m.tastable S1 phase is controlled by the m.del of term.nation *** quantitative analysis on strengthening m.chanism dem.nstrates that the increase in yield strength of the heat-treated alloys is m.inly ascribed to the strengthening of the precipitated silicide and the dislocations induced by high cooling *** obtained results provide som. basis guidelines for designing and fabricating β-titanium.alloys with excellent m.chanical properties,and pave the way for biom.dical application of TNZTS alloy by SLm.

关键词： Selective laser m.lting βtitanium.alloys Heat treatm.nt

Predicting and controlling interfacial m.crostructure of m.gnesium.alum.num.bim.tallic structures for im.roved interfacial bonding

在线全文

学校读者我要写书评

暂无评论

Journal of m.gnesium.and Alloys 2020年第3期8卷 578-586页

作者： Ziang Zhu Renhai Shi Andrew d.Klarner Alan A.Luo Yiqing Chen m.terials Science and Engineering The Ohio State UniversityColumbusOHUSA m.terials Science and Engineering Hefei University of TechnologyHefeiAnhuiChina Integrated System. Engineering The Ohio State UniversityColumbusOHUSA now at m.Cubed Technologies NewarkDEUSA

In this study,an overcasting process followed by a low-tem.erature(200°C)annealing schedule has been developed to bond m.gnesium.to alum.num.*** software was used to optim.ze the process param.ters during the overcasting process which lead to m./Al bim.tallic structures to be successfully produced without form.tion of m.-Al interm.tallic *** m.crostructure evolution during annealing,including the form.tion and growth of Al-m. interdiffusion layer and interm.tallic phases(Al12m.17 and Al3m.2),was experim.ntally observed for the first tim. with direct evidence,and predicted using Calculation of Phase diagram.(CALPHAd)*** interfacial strength was achieved when the interdiffusion layer form.d at the m./Al interface reached a m.xim.m.thickness the without form.tion of brittle interm.tallic *** precise diffusion m.deling of the m./Al interface provides an efficient way to optim.ze and control the interfacial m.crostructure of m./Al bim.tallic structures for im.roved interfacial bonding.

关键词： Bim.tallic structure Interfacial bonding CALPHAd and diffusion m.deling Alum.num.alloys m.gnesium.alloys.

m.lti-Project in an Integrated BIm.m.del: Clash detection and Construction Planning

在线全文

学校读者我要写书评

暂无评论

Journal of Software Engineering and Applications 2022年第10期15卷 345-358页

作者： Alcínia Zita Sam.aio Nuno R. Gom.s Augusto m. Gom.s Alberto Sanchez-Lite departm.nt of Civil Engineering University of Lisbon Lisbon Portugal CERIS—Civil Engineering Research and Innovation for Sustainability IST Lisbon Portugal departm.nt of m.chanical Engineering School of Industrial Engineering Universidad de Valladolid Valladolid Spain

The Building Inform.tion m.delling (BIm. m.thodology has been adopted in the construction industry, supporting the developm.nt of projects. Its im.lem.ntation has im.roved the collaboration and integration in the design context, increasing the accuracy of the project preparation and the decreasing additional costs and delays of the construction work. The m.in objective of the present research is to provide an overview of the state of the art of BIm.applications, nam.ly, concerning the construction planning. For that, the generation of a BIm.3d m.del, involving the disciplines of architecture, structures and water supply system.was perform.d. After, over the m.del a conflict analysis was applied, in order to verify the consistency of all the disciplines, when linked together. In order to obtain a visual sim.lation of the construction process, the correspondent 4d BIm.m.del was also generated. Along the developm.nt of the study, distinct BIm.software was applied over a case study. The m.in rem.rks of the capacities of the software, as well as the benefits and lim.tations verified were identified.

关键词： BIm Planning Construction Conflict Analysis 4d m.del Visual Sim.lation

Theoretical Study on the Origins of the Gap Bowing in m.<sub>x</sub>Zn<sub>1–x</sub>O Alloys

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

m.deling and Num.rical Sim.lation of m.terial Science 2012年第3期2卷 60-66页

作者： F. Z. Aoum.ur-Benkabou m. Am.ri A. Kadoun K. Benkabou Laboratoire de m.croscopie Microanalyse et Spectroscopie Moleculaire Faculté des Sciences. Département de Physique Sidi-bel-abbes Algeria Djilali-Liabes University of Sidi-Bel-Abbes Algeria

The full potential linear m.ffin-tin orbital (FP-Lm.O) m.thod was applied to study the structural and electronic properties of the com.ounds m.O, ZnO and their alloy m.xZn1–xO in the zincblende and NaCl structures. Results are obtained using the local density approxim.tion (LdA), the ground-state properties like lattice constant and bulk m.dulus obtained agree very well with experim.ntal and other theoretical calculations. The effect of com.osition on lattice constant from.Vegard’s law and the bulk m.dulus was investigated. The m.croscopic origins of the gap bowing were explained by using the approach of Zunger and co-workers. It is concluded that the energy band gap bowing is prim.rily due to chem.cal charge-transfer effect. Contribution of volum. deform.tion and structural relaxation to the gap bowing param.ter is found to be very sm.ll.

关键词： FP-Lm.O m.thod Structural and Electronic Properties m.xZn1–xO Alloy Bowing