检索结果-南通市图书馆

粉末冶金TC4-PCs复合材料的热变形行为

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

材料工程 2024年第10期52卷 90-96页

作者：佟健博潘宇张文强王平张明杰中国航发北京航空材料研究院先进钛合金重点实验室北京100095 北京科技大学工程技术研究院北京100083

以聚碳硅烷(PCs)为前驱体,采用粉末冶金无压烧结制备原位自生颗粒增强的TC4复合材料。通过gleeble-3500热模拟试验机对TC4-1PCs(PCs的质量分数为1%)复合材料进行850~1100℃,0.001~1 s^(-1)的模拟热压缩实验,分析不同参数下复合材料的应... 详细信息

以聚碳硅烷(PCs)为前驱体,采用粉末冶金无压烧结制备原位自生颗粒增强的TC4复合材料。通过gleeble-3500热模拟试验机对TC4-1PCs(PCs的质量分数为1%)复合材料进行850~1100℃,0.001~1 s^(-1)的模拟热压缩实验,分析不同参数下复合材料的应力-应变曲线。采用Om.sEm和EBsd等手段分析变形参数对增强相颗粒、基体组织和致密化的影响。结果表明:热变形前TC4-1PCs复合材料存在较多残余孔隙,TiC增强相颗粒尺寸约为5~10μm。TC4-1PCs基体的β转变温度(T_β)介于1000~1050℃之间,在T_β以上进行变形时,TC4-1PCs基体全部为片层状淬火马氏体,而在T_(β)以下变形后基体为双态组织。变形温度决定复合材料的致密度和组织类型,应变速率影响基体相尺寸和残余孔隙率。变形温度的提升和应变速率的降低可以促进TC4^(-1)PCs复合材料的致密化,应变速率的提高对细化组织效果明显。在1050℃,0.1 s^(-1)下变形可以较大程度实现TC4-1PCs复合材料组织细化和致密化。

关键词：颗粒增强钛基复合材料应力-应变曲线致密化粉末冶金

同方期刊数据库

粉末冶金Al-5.6Zn-2mg合金在热压缩过程中加工硬化特性及本构模型的比较

在线全文

学校读者我要写书评

暂无评论

journal of Central south University 2024年第2期31卷 346-368页

作者： kATIkA Harikrishna dAmOdA r.k. dAVIdsON m.j. sEETHArAm r. kAsAgANI Veera Venkata Nagaraju department of mechanical Engineering National Institute of TechnologyWarangal 506004India department of mechanical Engineering The Indian Institute of Information Technology Design and ManufacturingKurnool 518007India

在300~5000℃、应变速率为0.1~0.0001 s−1的条件下,在万能试验机上对Al-5.6Zn-2mg铝合金进行热压缩试验,以确定动态再结晶开始时的加工硬化速率曲线σ_(c)(ε_(c))l以及关键特征σ_(c)(ε_(c))l、σ_(p)(ε_(p))和σ_(ss)与Z系数之间的... 详细信息

在300~5000℃、应变速率为0.1~0.0001 s−1的条件下,在万能试验机上对Al-5.6Zn-2mg铝合金进行热压缩试验,以确定动态再结晶开始时的加工硬化速率曲线σ_(c)(ε_(c))l以及关键特征σ_(c)(ε_(c))l、σ_(p)(ε_(p))和σ_(ss)与Z系数之间的相关性。使用了四个本构模型,Arrhenius模型、改进的johnson-Cook模型(mjC)、改进的Zerilli-Armstrong模型(mZA)和开发的人工神经网络(ANN)。结果表明,ANN型模型和Arrhenius模型的相对误差的绝对平均值最低,分别为0.486%和3.36%,mZA型模型和mjC型模型的相对误差的绝对平均值较高,分别为8.84%和3.93%。由于Arrhenius模型能够处理各种因素之间的非线性关系,因此它被认为是最合适的预测模型,但在材料性质未知或实验数据有限的情况下,mjC模型可能是一种更简单的替代方法。mZA模型不适合估计热压缩时的流变应力。此外,训练最好的神经网络模型的预测性能最好,相对误差的绝对平均值为0.486%,r值为0.99。

关键词：加工硬化速率曲线本构建模热压缩 EBsd分析流变曲线

Enabling Technologies for Autonomous robotic systems in manufacturing

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Transactions of Nanjing University of Aeronautics and Astronautics 2024年第4期41卷 403-431页

作者： ErdŐs gábor ABAI kristóf BErEgI richárd CsEmPEsZ jános CsErTEg Tam.s gOdÓgábor HAjÓs mátyás HÁY Borbála HOrVÁTH dániel HOrVÁTH gergely jUNIkIÁdám kEmÉNY Zsolt kOVÁCs András NACsA jános PANITI Imre PEdONE gianfranco TAkÁCs Emma TIPArY Bence ZAHOrÁN László VÁNCZA józsef Institute for Computer science and Control Hungarian Research Network(HUN-REN SZTAKI)BudapestHungary department of manufacturing science and Technology Budapest University of Technology and Economics(BME)BudapestHungary EPIC InnoLabs Nonprofit Ltd. BudapestHungary Eötvös Loránd University(ELTE) BudapestHungary

research of autonomous manufacturing systems is motivated both by the new technical possibilities of cyber-physical systems and by the practical needs of the *** operation in semi-structured industrial environments can now be supported by advanced sensor technologies,digital twins,artificial intelligence and novel communication *** enable real-time monitoring of production processes,situation recognition and prediction,automated and adaptive(re)planning,teamwork and performance improvement by *** paper summarizes the main requirements towards autonomous industrial robotics and suggests a generic workflow for realizing such *** case studies will be presented from recent practice at HUN-rEN sZTAkI in a broad range of domains such as assembly,welding,grinding,picking and placing,and *** various solutions have in common that they use a generic digital twin concept as their *** making general recommendations for realizing autonomous robotic solutions in the industry,open issues for future research will be discussed.

关键词： industrial robotics autonomy digital twin enabling technology

minisCIdOm: a scintillator-based tomograph for volumetric dose reconstruction of single laser-driven proton bunches

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

High Power Laser science and Engineering 2024年第2期12卷 41-50页

作者： A.Corvino m.reimold E.Beyreuther F.-E.Brack F.kroll j.Pawelke j.d.schilz m.schneider U.schramm m.E.P.Umlandt k.Zeil T.Ziegler j.metzkes-Ng Helmholtz-Zentrum dresden–rossendorf DresdenGermany Technische Universität dresden DresdenGermany Oncoray–National Center for radiation research in Oncology Faculty of Medicine and University Hospital Carl Gustav CarusTUD Dresden University of TechnologyHelmholtz-Zentrum Dresden–RossendorfDresdenGermany Current affiliation:Institut Curie UniversitéPSLCNRS UMR3347OrsayFrance Current affiliation:Universitätsklinikum Freiburg FreiburgGermany

Laser plasma accelerators(LPAs)enable the generation of intense and short proton bunches on a micrometre scale,thus offering new experimental capabilities to research fields such as ultra-high dose rate radiobiology or material *** spectrally broadband,laser-accelerated proton bunches allow for tailored volumetric dose deposition in a sample via single bunches to excite or probe specific sample *** rising number of such experiments indicates a need for diagnostics providing spatially resolved characterization of dose distributions with volum.s of approximately 1 cm^(3) for single proton bunches to allow for fast online *** we present the scintillator-based minisCIdOm detector for online single-bunch tomographic reconstruction of dose distributions in volum.s of up to approximately 1 cm^(3).The detector achieves a spatial resolution below 500μm and a sensitivity of 100 *** detector performance is tested at a proton therapy cyclotron and an LPA proton *** experiments’primary focus is the characterization of the scintillator’s ionization quenching behaviour.

关键词： beam monitoring detectors laser-driven proton beams scintillator-based diagnostics ultra-high dose rate

三轴形变核^(131)Ba中的奇异集体激发模式

在线全文

学校读者我要写书评

暂无评论

物理学报 2024年第11期73卷 89-100页

作者：韦锐周厚兵王思成丁兵强赟华贾晨旭陈红星郭松 C.m.Petrache d.mengoni A.Astier E.dupont 吕冰锋 d.Bazzacco A.Boso A.goasduff F.recchia d.Testov F.galtarossa g.jaworski d.r.Napoli s.riccetto m.siciliano j.j.Valiente-dobon C.Andreoiu F.H.garcia k.Ortner k.Whitmore A.Ataç-Nyberg T.Bäck B.Cederwall E.A.Lawrie I.kuti d.sohler T.marchlewski j.srebrny A.Tucholski 广西师范大学物理科学与技术学院桂林541004 广西核物理与核技术重点实验室桂林541004 中国科学院近代物理研究所兰州730000 中国科学院大学北京100049 巴黎萨克雷大学 CNRS/IN2P3IJCLab奥赛91405 帕多瓦大学物理和天文学系帕多瓦I-35131 意大利国家核物理研究所帕多瓦分部帕多瓦I-35131 意大利国家核物理研究所莱尼亚罗国家实验室莱尼亚罗(帕多瓦)I-35020 费拉拉大学理学与自然科学院费拉拉西蒙菲莎大学化学系本拿比BC V5A 1S6 皇家理工学院物理系斯德哥摩尔S-10691 国家研究基金会iThemba加速器科学实验室西萨默塞特7123 西开普大学物理与天文系贝尔维尔ZA-7535 HUN-rEN原子核研究所德布勒森4001 华沙巴斯德拉大学重离子实验室华沙02-093

利用意大利Legnaro实验室串列静电加速器提供的65 meV^(13)C束流与122sn靶的熔合蒸发反应布居了^(131)Ba的高自旋态,并搭建了新的能级纲图.新的能级纲图由15条转动带组成,包括三对手征双重带,其中两对正宇称手征带为赝自旋-手征四重带.... 详细信息

利用意大利Legnaro实验室串列静电加速器提供的65 meV^(13)C束流与122sn靶的熔合蒸发反应布居了^(131)Ba的高自旋态,并搭建了新的能级纲图.新的能级纲图由15条转动带组成,包括三对手征双重带,其中两对正宇称手征带为赝自旋-手征四重带.正负宇称手征带通过一系列增强的E1跃迁连接,表明它们之间存在八极关联.在低自旋区域搭建了一条新的转动带,通过一系列γ跃迁向νh1_(1/2)晕带退激.这种能级结构与摇摆带相似,但基于现有的实验证据还难以将它确认为摇摆带,不能排除其他集体激发机制,如γ振动的影响.

关键词：高自旋态手征带赝自旋八极关联摇摆运动

维普期刊数据库博看期刊

Characterization of bright betatron radiation generated by direct laser acceleration of electrons in plasma of near critical density

在线全文

学校读者我要写书评

暂无评论

matter and radiation at Extrem.s 2024年第2期9卷 26-35页

作者： j.Cikhardt m.gyrdymov s.Zähter P.Tavana m.m.günther N.Bukharskii N.Borisenko j.jacoby X.F.shen A.Pukhov N.E.Andreev O.N.rosmej Faculty of Electrical Engineering Czech Technical University in Prague16627 Prague 6Czech Republic goethe University FrankfurtMax-von-Laue-Straße 160438 Frankfurt am MainGermany gsI Helmholtzzentrum für schwerionenforschung gmbH Planckstraße 164291 DarmstadtGermany Focused Energy gmbH Im Tiefen See 4564293 DarmstadtGermany National research Nuclear University mEPhI Kashirskoe shosse 31115409 MoscowRussian Federation Lebedev Physical Institute rAs Leninskiy Prospekt 53119991 MoscowRussian Federation Heinrich-Heine-University düsseldorf Universitätsstrasse 1DüsseldorfGermany joint Institute for High Temperatures RASIzhorskaya st.13Bldg.2125412 MoscowRussian Federation m.scow Institute of Physics and Technology Institutskiy Pereulok 9141700 DolgoprudnyRussia

directed x-rays produced in the interaction of sub-picosecond laser pulses of moderate relativistic intensity with plasma of near-critical density are investigated. synchrotron-like (betatron) radiation occurs in the process of direct laser acceleration (dLA) of electrons in a relativisticlaser channel when the electrons undergo transverse betatron oscillations in self-generated quasi-static electric and magnetic fields. In anexperiment at the PHELIX laser system, high-current directed beams of dLA electrons with a mean energy ten tim.s higher than the ponderomotive potential and maximum energy up to 100 meV were measured at 10^(19) W/cm^(2)laser intensity. The spectrum of directed x-raysin the range of 5–60 keV was evaluated using two sets of ross filters placed at 0°and 10°to the laser pulse propagation axis. The differential x-ray absorption method allowed for absolute measurements of the angular-dependent photon fluence. We report 10^(13) photons/sr withenergies >5 keV measured at 0°to the laser axis and a brilliance of 10^(21) photons s^(−1) mm^(−2) mrad−2(0.1%BW)−1. The angular distributionof the em.ssion has an FWHm of 14°–16°. Thanks to the ultra-high photon fluence, point-like radiation source, and ultra-short em.ssiontime, dLA-based keV backlighters are prom.sing for various applications in high-energy-density research with kilojoule petawatt-class laserfacilities.

关键词： laser acceleration critical

Laser processing effects on Ti−45Nb alloy surface,corrosive and biocompatible properties

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Transactions of Nonferrous metals society of China 2024年第8期34卷 2533-2551页

作者： I.CVIjOVIĆ-ALAgIĆ s.LAkETIĆ m.mOmČILOVIĆ j.CIgANOVIĆ Đ.VELjOVIĆ j.BAjAT V.kOjIĆ m.rAkIN Vinča Institute of Nuclear sciences-National Institute of the republic of serbia University of BelgradeP.O.Box 52211001 BelgradeSerbia Faculty of Technology and metallurgy University of BelgradeKarnegijeva 411120 BelgradeSerbia Oncology Institute of Vojvodina Faculty of MedicineUniversity of Novi SadPut Dr Goldmana 421204 Sremska KamenicaSerbia

The Ti−45Nb(wt.%)alloy properties were investigated in relation to its potential biomedical *** surface modification was utilized to improve its performance in biological *** a result of the laser treatment,(Ti,Nb)O scale was formed and various morphological features appeared on the alloy *** electrochemical behavior of Ti−45Nb alloy in simulated body conditions was evaluated and showed that the alloy was highly resistant to corrosion deterioration regardless of additional laser surface modification ***,the improved corrosion resistance after laser treatment was evident(the corrosion current density of the alloy before laser irradiation was 2.84×10^(−8)A/cm^(2),while that after laser treatment with 5 mj was 0.65×10^(−8)A/cm^(2))and ascribed to the rapid formation of a complex and passivating bi-modal surface oxide *** cytotoxicity and effects of the Ti−45Nb alloy laser surface modification on the mrC-5 cell viability,morphology,and proliferation were also *** Ti−45Nb alloy showed no cytotoxic ***,cells showed improved viability and adherence to the alloy surface after the laser irradiation *** highest average cell viability of 115.37%was attained for the alloy laser-irradiated with 15 *** showed that the laser surface modification can be successfully utilized to significantly improve alloy performance in a biological environment.

关键词： Ti−45Nb alloy laser surface scanning electrochemical properties biocompatibility cell morphology

同方期刊数据库

Interfacial stress engineering toward enhancement of ferroelectricity in Al doped HfO_(2)thin films

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2024年第9期33卷 637-643页

作者： s X Chen m m Chen Y Liu d W Cao g j Chen department of microelectronics Jiangsu UniversityZhenjiang 212013China department of Physics Jiangsu UniversityZhenjiang 212013China guangdong–Hong kong–macao joint Laboratory for Intelligent micro-Nano Optoelectronic Technology Foshan UniversityFoshan 528225China

Ferroelectric HfO_(2)has attracted much attention owing to its superior ferroelectricity at an ultra-thin thickness and good compatibility with si-based complementary metal-oxide-semiconductor(Cm.s)***,the crystallization of polar orthorhombic phase(o-phase)HfO_(2)is less competitive,which greatly limits the ferroelectricity of the as-obtained ferroelectric HfO_(2)thin ***,the crystallization of o-phase HfO_(2)can be thermodynamically modulated via interfacial stress *** this paper,the growth of improved ferroelectric Al doped HfO_(2)(HfO_(2):Al)thin films on(111)-oriented si substrate has been *** analysis has suggested that nonpolar monoclinic HfO_(2):Al grown on(111)-oriented si substrate suffered from a strong compressive strain,which promoted the crystallization of(111)-oriented o-phase HfO_(2)in the as-grown HfO_(2):Al thin *** addition,the in-plane lattice of(111)-oriented si substrate matches well with that of(111)-oriented o-phase HfO_(2),which further thermally stabilizes the o-phase HfO_(2).Accordingly,an improved ferroelectricity with a remnant polarization(2P_(r))of 26.7C/cm^(2) has been *** results shown in this work provide a simple way toward the preparation of improved ferroelectric HfO_(2)thin films.

关键词： improved ferroelectricity interfacial stress engineering compressive strain HfO_(2)

radioisotope production using lasers:From basic science to applications

在线全文

学校读者我要写书评

暂无评论

matter and radiation at Extrem.s 2024年第3期9卷 31-44页

作者： m.r.d.rodrigues A.Bonasera m.scisciò j.A.Pérez-Hernández m.Ehret F.Filippi P.L.Andreoli m.Huault H.Larreur d.singappuli d.molloy d.raffestin m.Alonzo g.g.rapisarda d.Lattuada g.L.guardo C.Verona Fe.Consoli g.Petringa A.mcNamee m.La Cognata s.Palmerini T.Carriere m.Cipriani g.di giorgio g.Cristofari r.de Angelis g.A.P.Cirrone d.margarone L.giuffrida d.Batani P.Nicolai k.Batani r.Lera L.Volpe d.giulietti s.Agarwal m.krupka s.singh Fa.Consoli Cyclotron Institute Texas A&M UniversityCollege StationTexas 77840USA Laboratori Nazionali del sud Istituto Nazionale di Fisica Nucleare(LNS-INFN)CataniaItaly ENEA Fusion and Technologies for Nuclear Safety and Security Department-CFrascatiItaly Centro de Láseres Pulsados(clpu) VillamayorSpain Universidad de salamanca SalamancaSpain Centre Lasers Intenses et Applications(CELIA) Universitéde BordeauxCNRSCEATalenceFrance HB11 Energy Holdings Pty FreshwaterNew South WalesAustralia school of mathematics and Physics Queen’s University BelfastBelfastUnited Kingdom dipartimento di Fisica e Astronomia“E.majorana ”Università di CataniaCataniaItaly Facoltàdi Ingegneria e Architettura Universitàdegli Studi di Enna“Kore”EnnaItaly dipartimento di Ingegneria Industriale Universitàdi Roma“Tor Vergata”RomaItaly dipartimento di Fisica e geologia Universitàdegli Studi di PerugiaPerugiaItaly Istituto Nazionale di Fisica Nucleare Sezione di PerugiaPerugiaItaly ELI Beamlines Facility the Extreme Light Infrastructure ERICDolni BrezanyCzech Republic ETsIA Universidad Politécnica de MadridMadridSpain dipartimento Fisica “E.Fermi”Universitàdi Pisa and INFNPisaItaly FZU–Institute of Physics of Czech Academy of sciences PragueCzech Republic Institute of Plasma Physics of Czech Academy of sciences PragueCzech Republic

The discovery of chirped pulse amplification has led to great improvements in laser technology,enabling energetic laser beams to be compressed to pulse durations of tens of femtoseconds and focused to a few *** with energies of tens of meV can be accelerated using,for instance,target normal sheath acceleration and focused on secondary *** such conditions,nuclear reactions can occur,with the production of radioisotopes suitable for medical *** use of high-repetition lasers to produce such isotopes is competitive with conventional methods m.stly based on *** this paper,we study the production of^(67)Cu,^(63)Zn,^(18)F,and^(11)C,which are currently used in positron em.ssion tomography and other *** the same time,we study the reactions^(10)B(p,α)^(7)Be and^(70)Zn(p,4n)^(67)ga to put further constraints on the proton distributions at different angles,as well as the reaction^(11)B(p,α)^(8)Be relevant for energy *** experiment was performed at the 1 PW laser facility at VegaⅢin salamanca,*** distributions of radioisotopes in the forward(with respect to the laser direction)and backward directions were measured using a high purity germanium *** results are in reasonable agreement with numerical estimates obtained following the approach of kimura and Bonasera[*** ***.,sect.A 637,164–170(2011)].

关键词： purity estimates backward