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Effect of growth rate on microstructure and solute distribution of Al-Zn-Mg alloy

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Transactions of Nonferrous Metals Society of China 2015年第5期25卷 1391-1398页

作者： A.l.RAMIREZ-lEdESMA R.A.ROdRíGUEZ-díAZ j.CHAVEZ-CARVAYAR O.AlVAREZ-FREGOSO j.A.jUAREZ-ISlAS Materials Research Institute National Autonomous Universtiy of Mexico Circuito Exterior S/NCd. Universitaria polytechnic University of the State of Morelos Boulevard Cuauhnahuac 556Col. Lomas del Texcal

An Al-5.3%Zn-5.3%Mg alloy was unidirectionally solidified to determine morphological transition and solute distribution by a modification of the Bridgman technique for crystal growth with growth rates ranging from 4-500 μm/s and a temperature gradient of 25 K/cm. It was determined that growth rates from 6.5-9.5 μm/s generated a cell morphology, where the lower limit corresponds to the plane front to cellular transition and the upper limit indicates the cellular to columnar dendrite transition. The microstructures of the alloys solidified from 30 μm/s to growth rates less than 500 μm/s were mainly composed of columnar dendrites, while the microstructures solidified at growth rates greater than 500 μm/s were equiaxed. Regarding experimental results on solute distribution, a prediction of the model developed by Rappaz and Boettinger for dendrite solidification of multicomponent alloys was applied with excellent agreement. Results of solute distribution were employed to derive the precipitation fraction of τ-phase needed to increase the electrochemical properties of the alloy to be used as an Al-sacrificial anode.

关键词： aluminum alloy unidirectional solidification growth rate solute distribution dendrite growth model

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平面排列触觉传感器的有限元模型

机器人 1996年第1期18卷 16-20页

作者：赵志岗 d.Fenner 天津大学力学系 300072 伦敦大学国王学院

有限单元法是分析机器人触觉传感器介质力学行为的最有效方法之一.本文将平面排列触觉传感器介质简化为一个有限体积的砖形模型,用三维有限元法计算了它承受不同形状平底压头作用时的应变场.用计算结果绘出的应变等值线图清楚地描述了... 详细信息

有限单元法是分析机器人触觉传感器介质力学行为的最有效方法之一.本文将平面排列触觉传感器介质简化为一个有限体积的砖形模型,用三维有限元法计算了它承受不同形状平底压头作用时的应变场.用计算结果绘出的应变等值线图清楚地描述了接触区的形状,对传感器设计者具有重要的参考价值.

关键词：触觉传感器有限单元法机器人传感器

Cs_(3)Bi_(2)l_(9)-hydroxyapatite composite waste forms for cesium and iodine immobilization

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journal of Advanced Ceramics 2022年第5期11卷 712-728页

作者： Kun YANG Yachun WANG junhua SHEN Spencer M.SCOTT Brian j.RIlEY john d.VIENNA jie lIAN department of Mechanical Aerospaceand Nuclear EngineeringRensselaer Polytechnic InstituteTroyUSA department of Materials Science&Engineering Rensselaer Polytechnic InstituteTroyUSA Savannah River National laboratory AikenUSA Pacific Northwest National laboratory RichlandUSA

Perovskite-based ceramic composites were developed as potential waste form materials for immobilizing cesium(Cs)and iodine(I)with high waste loadings and chemical *** perovskite Cs_(3)Bi_(2)I_(9)has high Cs(22 wt%)and I(58 wt%)content,and thus can be used as a potential host phase to immobilize these critical *** this work,the perovskite Cs_(3)Bi_(2)I_(9)phase was synthesized by a cost effective solution-based approach,and was embedded into a highly durable hydroxyapatite matrix by spark plasma sintering to form dense ceramic composite waste *** chemical durabilities of the monolithic Cs_(3)Bi_(2)I_(9)and Cs_(3)Bi_(2)I_(9)-hydroxyapatite composite pellets were investigated by static and semi-dynamic leaching tests,*** and I are incongruently released from the matrix for both pure Cs_(3)Bi_(2)I_(9)and composite *** normalized Cs release rate is faster than that of I,which can be explained by the difference in the strengths between Cs-I and Bi-I bonds as well as the formation of insoluble micrometer-sized BiOI *** activation energies of elemental releases based on dissolution and diffusion-controlled mechanisms are determined with significantly higher energy barriers for dissolution from the composite versus that of the monolithic Cs_(3)Bi_(2)I_(9).The ceramic-based composite waste forms exhibit excellent chemical durabilities and waste loadings,commensurate with the state-of-the-art glass-bonded perovskite composites for I and Cs immobilization.

关键词： cesium(Cs) iodine(Ⅰ) perovskite nuclear waste hydroxyapatite

3d digital design of Cranes' Structures Based on Hybrid Software Architecture

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武汉理工大学学报 2006年第S1期28卷 96-101页

作者： WANG Chonghua1,lI Hua 1,2 (1.dept. of Mechanical Engineering,Shanghai Maritime University,Shanghai 200135,China 2.Worcester polytechnic Institute,Worcester 01609,MA,USA) dept.of Mechanical Engineering Shanghai Maritime UniversityShanghai 200135China dept.of Mechanical Engineering Shanghai Maritime UniversityShanghai 200135China Worcester polytechnic Institute Worcester 01609MAUSA

3d digital design for cranes’ structures based on hybrid software architecture of Client/Server and Browser/Server is introduced in this paper. Based on Pro/ENGINEER platform,3d parametric model family is built to allow generation of feasible configurations of cranes’ structures in Client/Server framework. Taking use of Visual C++,the second exploiting software kit provided by Pro/ENGINEER and ANSYS GUI/APdl modeling patterns,an integration method of 3d CAd and CAE is achieved,which includes regeneration of 3d parametric model,synchronous updating and analysis of FEA model. As in Browser/Server framework,the 3d CAd models of parts,components and the whole structure could also be displayed in the customer’s browser in VRMl format.

关键词： digital design crane’s structure hybrid software architecture CAd/CAE integration

Observation of an EPIR Effect in Nd_(1-x)Sr_xMnO_3 Ceramics with Secondary Phases

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journal of Materials Science & Technology 2013年第8期29卷 737-741页

作者： S.S.Chen X.j.luo d.W.Shi H.li C.P.Yang School of Mathematics and Physics Hubei Polytechnic University Faculty of Physics and Electronic Technology Hubei University

Nd1-xSrxMnO3 （x ： 0.3, 0.5） ceramics containing a secondary phase are synthesized by high-energy ball milling and post heat-treatment method. The 4-wire and 2-wire measuring modes are used to investigate the transport character of the grain/phase boundary （inner interface） and electrode-bulk interface （outer interface）, respectively, and the results indicate that there is a similar nonlinear I-V behaviour for both of the inner and outer interfaces, however, the electric pulse induced resistance change （EPIR） effect can only be observed at the outer interface.

关键词： Electric pulse induced resistance change (EPIR) Space charge layer Nonlinearity Manganite High-energy ball milling

Synthesis and Crystal Structure of Novel Fe_3 Cluster Compound

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Chinese journal of Structural Chemistry 1996年第1期15卷 31-34页

作者： lu Qing-Wei Wang Yi-Bing Wu Bao-Shan Suo Quan-ling liu Shu-Tang Hu Xiang (department of Chemical Engineering Inner Mongolia polytechnic University, Hohhot, 010062)Sun jie(Inboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistr department of Chemical Engineering Inner Mongolia Polytech. University Hohhot 010062 Inboratory of Organometallic Chem. Shanghai Inst. of Organic Chemistry Chinese Academy of Sciences Shanghai 200032 department of Chemistry Inner Mongolia University

The title compound Fe_3 (CO)_8(CN)S_2 was synthesized by the reaction of C_6H_5NCS cleaving fragments with Fe_3 (CO)_(12) at room temperature. Crystal data: C_9Fe_3NO_8S_2, Mr=481. 76, triclinic , space group P1,a= 9. 436 (3), b=10. 210(2), c=9. 14l(3) A, a =90. 63(2), β=117. 55(3), γ=96. 66(2)°, V=773. 5(4) A￣3 , Z=2, d_c= 2. 068 g/cm￣3, μ(MoKa)=30. 78 cm￣(-1), F(000)=470 .T= 293K , final R=0. 030 and R_w=0. 041 for 2314 observed reflections with I>3. 00 σ(I).The monosubstituted ligand(CN)in Fe_3 (CO)_8 (CN)S_2 is linked to basal Fe (3) atom of the distorted tetragonal pyramid Fe_3S_2 framework.

关键词： synthesis crystal structure iron cluster cyano ligand

Fast laser surface texturing of spherical samples to improve the frictional performance of elasto-hydrodynamic lubricated contacts

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Friction 2021年第5期9卷 1227-1241页

作者： G.BOIdI P.G.GRÜTZMACHER A.KAdIRIC F.j.PROFITO I.F.MACHAdO C.GACHOT d.dINI department of Mechanical Engineering Imperial College LondonSouth Kensington CampusLondon SW72AZUK AC2T research GmbH Wiener Neustadt 2700Austria polytechnic School University of São Paulo–USPSão Paulo 05508-030Brazil department of Engineering design and Product development TU WienWien 1060Austria department of Material Science and Engineering Saarland UniversitySaarbrücken 66123Germany

Textured surfaces offer the potential to promote friction and wear reduction by increasing the hydrodynamic pressure,fluid uptake,or acting as oil or debris ***,texturing techniques often require additional manufacturing steps and costs,thus frequently being not economically feasible for real engineering *** experimental study aims at applying a fast laser texturing technique on curved surfaces for obtaining superior tribological performances.A femtosecond pulsed laser(Ti:Sapphire)and direct laser interference patterning(with a solid‐state Nd:YAG laser)were used for manufacturing dimple and groove patterns on curved steel surfaces(ball samples).Tribological tests were carried out under elasto‐hydrodynamic lubricated contact conditions varying slide‐roll ratio using a ball‐on‐disk ***,a specific interferometry technique for rough surfaces was used to measure the film thickness of smooth and textured *** steel samples were used to obtain data for the reference *** results showed that dimples promoted friction reduction(up to 20%)compared to the reference smooth specimens,whereas grooves generally caused less beneficial or detrimental *** addition,dimples promoted the formation of full film lubrication conditions at lower *** study demonstrates how fast texturing techniques could potentially be used for improving the tribological performance of bearings as well as other mechanical components utilised in several engineering applications.

关键词： surface laser texturing elasto‐hydrodynamic lubrication bearings friction film thickness

Search for the rare decay B^(0)→j/ψФ

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Chinese Physics C 2021年第4期45卷 47-60页

作者： R.Aaij C.Abellin Beteta T.Ackernley B.Adeva M.Adinolfi H.afsharnial C.A.Aidala S.Aiola Z.Ajaltouni S.Akar j.Albrecht F.Alessio M.Alexander A.Alfonso Albero Z.Aliouche G.Alkhazov P.Alvarez Cartelle S.Amato Y.Amhis l.An l.Anderlini A.Andreianov M.Andreotti F.Archilli A.Artamonov M.Artuso K.Arzymatov E.Aslanides M.Atzeni B.Audurier S.Bachmann M.Bachmaver j.j.Back S.Baker P.Baladron Rodriguez V.Balagura W.Baldinit j.Baptista leite R.j.Barlow S.Barsuk W.Barter M.Bartolini F.Baryshnikov j.M.Basels G.Bassi B.Batsukh A.Battig A.Bay M.Becker F.Bedeschis I.Bediaga A.Beiter V.Belavin S.Belin V.Bellee K.Belous I.Belov I.Belyaev G.Bencivenni E.Ben-Haim A.Berezhnoy *** d.Berninghoff H.C.Bernstein C.Bertella E.Bertholet A.Bertolin C.Betancourt F.Betti M.O.Bettler Ia.Bezshyiko S.Bhasin j.Bhom l.Bian M.S.Bieker S.Bifani P.Billoir M.Birch F.C.R.Bishop A.Bizzeti M.Biorn M.P.Blago T.Blake F.Blanc S.Blusk d.Bobulska j.A.Boelhauve O.Boente Garcia T.Boettcher A.Boldyrev A.Bondar N.Bondar S.Borghi M.Borisyak M.Borsato j.T.Borsuk S.A.Bouchiba T.j.V.Bowcock A.Boyer C.Bozzi M.j.Bradley S.Braun A.Brea Rodriguezs M.Brodski j.Brodzicka A.Brossa Gonzalo d.Brundu A.Buonaura C.Burr A.Burschee A.Butkevich j.S.Butter j.Buytaert W.Byczynski S.Cadeddu H.Cai R.Calabrese l.Calefice l.Calero diaz S.Cali R.Calladine M.Calvi M.Calvo Gomez P.Camargo Magalhaes A.Camboni P.Campana d.H.Campora Perez A.F.Campoverde Quezada S.Capelli l.Capriotti A.Carbonel G.Carboni R.Cardinale A.Cardini I.Carli P.Carniti l.Carus K.Carvalho Akiba A.Casais Vidal G.Casse M.Cattaneo G.Cavallero S.Celani j.Cerasoli A.j.Chadwick M.G.Chapman M.Charles Ph.Charpentier G.Chatzikonstantinidis C.A.Chavez Barajas M.Chefdeville C.Chen S.Chen A.Chernov S.-G.Chitic V.Chobanova S.Cholak M.Chrzaszcz A.Chubykin V.Chulikov P.Ciambrone M.F.Cicala X.Cid Vidal G.Ciezarek P.E.l.Clarke M.Clemencic H.V.Cliff j.Closier j.l.Cobbledick V.Coco j.A.B.Coelho j.Cogan E.Cogneras l.Cojocariu P.Collins T.Colombo l.Congedo A.Contu N.Cooke G.Coombs G.Corti C.M.Costa Sobral B.Couturier d.C.Craik j.Crkovska M.Cruz Centro Brasileiro de Pesquisas Fisicas(CBPF) Riode JaneiroBrazil Universidade Federal do Riode janeiro(UFRj) Riode JaneiroBrazil Center for High Energy Physics Tsinghua UniversityBeijingChina School of Physics State Key laboratory of Nuclear Physics and Technology Peking UniversityBeijingChina University of Chinese Academy of Sciences BeijingChina Institute Of High Energy Physics(IHEP) BejingChina Institute of Particle Physics Central China Normal UniversityWuhanHubeiChina Univ.Grenoble Alpes Univ.Savoie Mont BlancCNRSIN2P3-LAPPAnnecyFrance Universite Clermont Auvergne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance Universitq Paris-Saclay CNRS/IN2P3IJCLabOrsayFrance lPNHE Sorbonne UniversiteParis Diderot Sorbonne Paris CiteCNRS/IN2P3ParisFrance I.Physikalisches Institut RWTH Aachen UniversityAachenGermany Fakultat Physik Technische Universitat DortmundDortmundGermany Max-Planck-Institut fir Kernphysik(MPIK) HeidelbergGermany Physikalisches Institut Ruprecht-Karls-Universitat HeidelbergHeidelbergGermany School of Physics University College DublinDublinIreland INFN Sezione di Bari BariItaly INFN Sezione di Bologna BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN laboratori Nazionali di Frascati Frascatiltaly INFN Sezione di Genova GenovaItaly INFN Sezione di Milano Bicocca Milanolaly INFN Sezione di Milano MilanoItaly INFN Sezione di Cagliari Monserratoltaly Universita degli Studi di Padova Universita e INFNPadovaPadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma Tor Vergata RomaItaly INFN Sezione di Roma la Sapienza RomaItaly Nikhef National Institute for Subatomic Physics AmsterdamNetherlands Nikhef National Institute for Subatomic Physics and VU University Amsterdam AmsterdamNetherlands Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences KrakowPoland AGH-University of Science and Technology Faculty of Physics and Applied Computer Science

A search for the rare decay B^(0)→j/ψФis performed using Pp collision data collected with the lHCb dete-ctor at centre-of-mass energies of 7,8 and 13 TeV,corresponding to an integrated luminosity of9 *** significant signal of the decay is observed and an upper limitof 1.1x 10^(-7)at 90%confidence level is set on the branching fraction.

关键词： B physics flavour physics rare decay ω-Фmixing branching fraction

Search for the doubly heavy baryons Ω^(0)_(bc) and E^(0)_(bc) decaying to Λ^(+)_(c)π^(-) and E^(+)_(c)π^(-)

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Chinese Physics C 2021年第9期45卷 10-21页

作者： R.Aaij C.Abelian Beteta T.Ackernley B.Adeva M.Adinolfi H.afshamia C.A.Aidala S.Aiola Z.Ajaltouni S.Aka j.Albrecht F.Alessio M.Alexander A.Alfonso Albero Z.Aliouche G.Alkhazov P.Alvarez Cartelie S.Amato Y.Amhis l.An l.Anderlini A.Andreianov M.Andreotti F.Archilli A.Artamonov M.Artuso K.Arzymatov E.Aslanides M.Atzeni B.Audurier S.Bachmann M.Bachmayer j.j.Back P.Baladron Rodriguez V.Balagura W.Baldini j.Baptista leite R.j.Barlow S.Barsuk W.Barter M.Bartolini F.Baryshnikov j.M.Basels G.Bassi B.Batsukh A.Battig A.Bay M.Becker F.Bedeschi I.Bediaga A.Beiter V.Belavin S.Belin V.Bellee K.Belous I.Belov I.Belyaev G.Bencivenni E.Ben-Haim A.Berezhnoy *** d.Beminghoff H.C.Bernstein C.Bertella A.Bertolin C.Betancourt F.Betti Ia.Bezshyiko S.Bhasin j.Bhom l.Bian M.S.Bieker S.Bifani P.Billoir M.Birch F.C.R.Bishop A.Bitadze A.Bizzeti M.Bjorn M.P.Blago T.Blake F.Blanc S.Blusk d.Bobulska j.A.Boelhauve O.Boente Garcia T.Boettcher A.Boldyrev A.Bondar N.Bondar S.Borghi M.Borisyak M.Borsato j.T.Borsuk S.A.Bouchiba T.j.V.Bowcock A.Boyer C.Bozzi M j.Bradley S.Braun A.Brea Rodriguez M.Brodski j.Brodzicka A.Brossa Gonzalo d.Brundu A.Buonaura C.Burr A.Bursche A.Butkevich j.S.Butter j.Buytaert W.Byczynski S.Cadeddu H.Cai R.Calabrese l.Calefice l.Calero diaz S.Cali R.Calladine M.Calvi M.Calvo Gomez P.Camargo Magalhaes A.Camboni P.Campana A.F.Campoverde Quezada S.Capelli l.Capriotti A.Carbone G.Carboni R.Cardinale A.Cardini I.Carli P.Camiti l.Carus K.Carvalho Akiba A.Casais Vidal G.Casse M.Cattaneo G.Cavallero S.Celani j.Cerasoli A.j.Chadwick M.G.Chapman M.Charles Ph.Charpentier G.Chatzikonstantinidis C.A.Chavez Barajas M.Chefdeville C.Chen S.Chen A.Chernov V.Chobanova S.Cholak M.Chrzaszcz A.Chubykin V.Chulikov P.Ciambrone M.F.Cicala X.Cid Vidal G.Ciezarek P.E.l.Clarke M.Clemencic H.V.Cliff j.Closier j.l.Cobbledick V.Coco j.A.B.Coelho j.Cogan E.Cogneras l.Cojocariu P.Collins T.Colombo l.Congedo A.Contu N.Cooke G.Coombs G.Corti C.M.Costa Sobral B.Couturier d.C.Craik j.Crkovska M.Cruz Torres R.Currie C.l.da Silva E.dall'Occo j.dalseno C.d'Ambrosi Centro Brasileiro de Pesquisas Fisicas(CBPF) Rio de JaneiroBrazil Universidade Federal do Rio de janeiro(UFRj) Rio de JaneiroBrazil Center for High Energy Physics Tsinghua UniversityBeijingChina Institute of High Energy Physics(IHEP) BeijingChina School of Physics State Key laboratory of Nuclear Physics and Technology Peking UniversityBeijingChina University ofChinese Academy of Sciences BeijingChina Institute of Particle Physics Central China Normal UniversityWuhanHubeiChina Univ.Savoie Mont Blanc CNRSIN2P3-LAPPAnnecyFrance Universite Clermont Auvergne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance Universite Paris-Saclay CNRS/IN2P3IJCLabOrsayFrance laboratoire leprince-Ringuet CNRS/IN2P3Ecole PolytechniqueInstitut Polytechnique de ParisPalaiseauFrance lPNHE Sorbonne UniversiteParis Diderot Sorbonne Paris CiteCNRS/FN2P3ParisFrance I.Physikalisches Institut RWTH Aachen UniversityAachenGermany Fakultat Physik Technische Universitat DortmundDortmundGermany Max-Planck-Institut für Kemphysik(MPIK) HeidelbergGermany Physikalisches Institut Ruprecht-Karls-Universitat HeidelbergHeidelbergGermany School of Physics University College DublinDublinIreland INFN Sezione di Bari BariItaly INFN Sezione di Bologna BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN laboratori Nazionali di Frascati FrascatiItaly INFN Sezione di Genova GenovaItaly INFN Sezione di Milano MilanoItaly INFN Sezione di Milano-Bicocca MilanoItaly INFN Sezione di Cagliari MonserratoItaly Universita degli Studi di Padova Universita e INFNPadovaPadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma la Sapienza RomaItaly INFN Sezione di Roma Tor Vergata RomaItaly Nikhef National Institute for Subatomic Physics AmsterdamNetherlands Nikhef National Institute for Subatomic Physics and VU University Amsterdam AmsterdamNetherlands AGH-University of Science and Technology Faculty of Physics and Applied Computer ScienceKr

The first search for the doubly heavyΩ^(0)_(bc)baryon and a search for the E^(0)_(bc)baryon are performed using pp collision data collected via the lHCb experiment from 2016 to 2018 at a centre-of-mass energy of 13 TeV,corresponding to an integrated luminosity of 5.2 fb^(-1).The baryons are reconstructed via their decays to Λ^(+)_(c)π^(-)and E^(+)_(c)π^(-).No significant excess is fbund for invariant masses between 6700 and 7300 MeV/c^(2),in a rapidity range from 2.0 to 4.5 and a transverse momentum range from 2 to 20 MeV/*** limits are set on the ratio of the Ω^(0)_(bc)and E^(0)_(bc)production cross-section times the branching fraction to Λ^(+)_(c)π^(-)(E^(+)_(c)π^(-))relative to that of the Λ^(0)_(b)(E^(0)_(b))baryon,for different lifetime hypotheses,at 95%confidence *** upper limits range from 0.5 x 10^(-4)to 2.5 x 10^(-4)for theΩ^(0)_(bc)→Λ^(+)_(c)π^(-)(E^(0)_(bc)→Λ^(+)_(c)π^(-))decay,and from 1.4x 10^(-3)to 6.9 x 10^(-3)for theΩ^(0)_(bc)→E^(+)_(c)π^(-)(E^(0)_(bc)→E^(+)_(c)π^(-))decay,depending on the considered mass and lifetime of theΩ^(0)_(bc)(E^(0)_(bc))baryon.

关键词： B physics quarkonium spectroscopy heavy quark production