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the relation between ductility at high temperature and solid solution in Mg alloys

Journal of Magnesium and Alloys 2022年第1期10卷 241-256页

作者： d.F.Shi c.M.cepeda-Jiménez M.t.Pérez-Prado IM dEA Materials Institute C/Eric Ka ridel228906 GetafeMadridSpain department of Materials Science Polytechnic University of Madrid/Universidad Politecnica de MadridE.T.S.de Ingenieros de Caminos28040MadridSpain department of Physical Metallurgy CENIMCSICAv.Gregorio del Amo 828040 MadridSpain

this work investigates the effect of solid solution on ductility and on the activation of individual deformation mechanisms at moderate temperatures and at quasi-static strain rates in Mg-Zn and Mg-Al alloys. With that aim, four solid solution Mg-Zn and Mg-Al binary alloy ingots containing 1 and 2 wt.% solute atoms were subjected to hot rolling and subsequent annealing to generate polycrystals with similar average grain size and basal-type texture for each composition. the activity of the different slip systems after tensile testing at 150°c and at 250°c was evaluated in pure Mg and in the alloys by EBSd-assisted slip trace analysis. In addition, segregation of Zn and Al atoms at grain boundaries during the thermo-mechanical processing was characterized by HAAdF-StEM and EdX. It was found that while the addition of Al and Zn atoms to pure Mg does not lead to major changes in the mechanical strength at the investigated temperatures, it does enhance ductility significantly, especially at 250℃. Our results show that this increase in ductility cannot be attributed to a higher activation of non-basal systems in the alloys, as reported earlier, as the incidence of non-basal systems is indeed considerably higher in pure Mg. this work suggests, on the contrary, that the ductility increase may be attributed to the presence of a more homogenous basal activity in the alloys due to a lower degree of orientation clustering, to grain boundary solute segregation, and to a higher slip diffusivity at grain interiors.

关键词： Magnesium Solute segregation Slip trace analysis ductility deformation mechanisms

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MULtI-FAcILItY ORdEREd MEdIAN PROBLEMS IN dIREctEd NEtWORKS

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Journal of Systems Science & complexity 2011年第1期24卷 61-67页

作者： Huajun tANG t. c. Edwin cHENG c. t. NG Faculty of Management and Administration Macao University of Science and Technology Macao China department of Logistics and Maritime Studies The Hong Kong Polytechnic University Hong Kong China

this paper uses a finite dominating set （FdS） to investigate the multi-facility ordered median problem （OMP） in a strongly connected directed network. the authors first prove that the multi-facility OMP has an FdS in the node set, which not only generalizes the FdS result provided by Kalcsics, et al. （2002）, but also extends the FdS result from the single-facility case to the multiple case, filling an important gap. then, based on this FdS result, the authors develop an exact algorithm to solve the problem. However, if the number of facilities is large, it is not practical to find the optimal solution, because the multi-facility OMP in directed networks is NP-hard. Hence, we present a constant-approximation algorithm for the p-median problem in directed networks. Finally, we pose an open problem for future research.

关键词： Algorithms finite dominating sets multi-facility ordered median problem pseudoequilibria.

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Exorcising memories of internalised stigma: the demons of lived experience

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World Journal of Psychiatry 2021年第3期11卷 63-72页

作者： Joanna Ruth fox School of Education and Social care Anglia Ruskin UniversityCambridge CB11PTUnited Kingdom

Public stigma and self-stigma impact negatively on the lives of people with mental health *** people in society stereotype and discriminate against people with mental ill-health,and often this negative process of marginalisation is internalised by people with lived ***,this negative internalisation leads to the development of *** this article,I reflect on my own experiences of shame and self-stigma as a person with mental ill-health socially bullied by peers from my community and social groups.I present a personal narrative of both public and self-stigmatisation which I hope will enable me to exorcise memories of internalised stigma,which are encountered as my demons of lived *** reflexivity,a process used widely in health and social care fields,I consider how social bullying shattered my fragile confidence,selfesteem,and self-efficacy in the early days of my recovery;the impact of associative stigma on family members is also *** this,the potential to empower people who experience shame and stigma is explored alongside effective anti-stigma processes which challenge discrimination.I connect the concept of recovery with the notion of empowerment,both of which emphasise the importance of agency and self-efficacy for people with mental ***,I consider how the concepts of empowerment and recovery can challenge both the public stigma held by peers in the community and the selfstigma of those with lived experiences.

关键词： Stigma User-led narrative Reflexivity Empowerment Recovery Mental health

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Faujasite zeolite decorated with cobalt ferrite nanoparticles for improving removal and reuse in Pb^2+ions adsorption

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chinese Journal of chemical Engineering 2020年第7期28卷 1884-1890页

作者： Elaine c.Paris João O.d.Malafatti Henrique c.Musetti Alexandra Manzoli Alessandra Zenatti Márcia t.Escote Nanotechnology National Laboratory for Agriculture(LNNA) Embrapa InstrumentaçãoXV de Novembro St.145213560-970 São CarlosSPBrazil department of chemistry Federal University of São CarlosRod.Washington Luizkm 23513565-905 São CarlosSPBrazil Regional Integrated University of High Uruguay and Missions(URI) Sete de Setembro Ave.162199709-910ErechimRSBrazil Federal University of ABc(UFABc) Avenida dos Estados5001Santo AndréSPBrazil

Water pollution caused by heavy metals ions has been gaining attention in recent years,increasing the interest in the development of methodologies for their efficient removal focusing on the adsorption process for these *** current challenge faced by adsorption processes is the adequate adsorbent immobilization for removal and ***,the present work aimed at producing a faujasite zeolite nanocomposite decorated with cobalt ferrite nanoparticles for Pb^2+ions adsorption in an aqueous medium improving magnetic removal and *** a result,a high surface area(434.4 m^2·g^-1)for the nanocomposite and an 18.93 emu·g^-1 saturation magnetization value were obtained,indicating magnetic removal in a promising material for adsorption *** nanocomposite regeneration capacity evaluated by magnetic recovery after 24 h suspension presented a high Pb^2+ion adsorptive capacity(98.4%)in the first *** 98%of the Pb^2+ions were adsorbed in the second *** this way,the synthesized faujasite:cobalt ferrite nanocomposite reveals itself as a promising alternative in adsorption processes,aiming at a synergic effect of FAU zeolite high adsorptive activity and the cobalt ferrite nanoparticles magnetic activity,allowing for adsorbent recovery from the aqueous medium via magnetic force and successive adsorptive cycles.

关键词： Faujasite zeolite Adsorption cobalt ferrite Nanoparticles Magnetic nanocomposite

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A Process Interpretation of daoist thought

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Frontiers of Philosophy in china 2017年第1期12卷 26-37页

作者： Alan fox department of Philosophy University of Delaware Delaware 19716 USA

despite the fact that the dao de Jing 道德经 is one of the most frequently translated texts in history, most of these translations share certain unexamined and problematic assumptions which often make it seem as though the text is irrational, incoherent, and full of non sequiturs. Frequently, these assumptions involve the imposition of historically anachronous, linguistically unsound, and philosophically problematic categories and attitudes onto the text. One of the main causes of the problem is the persistent tendency on the part of most translators to read the first line of the text as referring to or implying the existence of some kind of ＂eternal dao.＂ these are what I term ＂ontological＂ readings, as opposed to the ＂process＂ reading I will be articulating here.

关键词： dao de Jing dao de weiwuwei process philosophy Zhuangzi paradox Whitehead Amds and Hall William James

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Polyethylene glycol fusion repair of severed rat sciatic nerves reestablishes axonal continuity and reorganizes sensory terminal fields in the spinal cord

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Neural Regeneration Research 2025年第7期20卷 2095-2107页

作者： Emily A.Hibbard Liwen Zhou cathy Z.Yang Karthik Venkudusamy Yessenia Montoya Alexa Olivarez George d.Bittner dale R.Sengelaub Program in Neuroscience Indiana UniversityBloomingtonINUSA department of Neuroscience University of Texas at AustinAustinTXUSA

Peripheral nerve injuries result in the rapid degeneration of distal nerve segments and immediate loss of motor and sensory functions;behavioral recovery is typically *** used a plasmalemmal fusogen,polyethylene glycol(PEG),to immediately fuse closely apposed open ends of severed proximal and distal axons in rat sciatic *** have previously reported that sciatic nerve axons repaired by PEG-fusion do not undergo Wallerian degeneration,and PEG-fused animals exhibit rapid(within 2–6 weeks)and extensive locomotor ***,our previous report showed that PEG-fusion of severed sciatic motor axons was non-specific,i.e.,spinal motoneurons in PEG-fused animals were found to project to appropriate as well as inappropriate target *** this study,we examined the consequences of PEG-fusion for sensory axons of the sciatic *** adult male and female rats(Sprague–dawley)received either a unilateral single cut or ablation injury to the sciatic nerve and subsequent repair with or without(Negative control)the application of *** action potentials recorded immediately after PEG-fusion repair confirmed conduction across the injury *** success of PEG-fusion was confirmed through Sciatic Functional Index testing with PEG-fused animals showing improvement in locomotor function beginning at 35 days *** 2–42 days postoperatively,we anterogradely labeled sensory afferents from the dorsal aspect of the hindpaw following bilateral intradermal injection of wheat germ agglutinin conjugated horseradish ***-fusion repair reestablished axonal *** to unoperated animals,labeled sensory afferents ipsilateral to the injury in PEG-fused animals were found in the appropriate area of the dorsal horn,as well as inappropriate mediolateral and rostrocaudal ***,despite having intact peripheral nerves,similar reorganizations of labeled sensory afferents were also observed contralateral to the injury and repa

关键词： axotomy dorsal horn peripheral nerve injury plasticity polyethylene glycol(PEG) sciatic nerve sensory terminals wheat germ agglutinin horseradish peroxidase

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Measurements of the ablation-front trajectory and low-mode nonuniformity in direct-drive implosions using x-ray self-emission shadowgraphy

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High Power Laser Science and Engineering 2015年第3期3卷 20-27页

作者： d.t.Michel A.K.davis W.Armstrong R.Bahr R.Epstein V.N.Goncharov M.Hohenberger I.V.Igumenshchev R.Jungquist d.d.Meyerhofer P.B.Radha t.c.Sangster c.Sorce d.H.Froula Laboratory for Laser Energetics University of Rochester

Self-emission x-ray shadowgraphy provides a method to measure the ablation-front trajectory and low-mode nonuniformity of a target imploded by directly illuminating a fusion capsule with laser beams. the technique uses time-resolved images of soft x-rays(>1 ke V) emitted from the coronal plasma of the target imaged onto an x-ray framing camera to determine the position of the ablation front. Methods used to accurately measure the ablation-front radius(δ R= ±1.15 μm), image-to-image timing(δ( t)= ±2.5 ps) and absolute timing(δt= ±10 ps) are *** averaging of the images provides an average radius measurement of δ( Rav)= ±0.15 μm and an error in velocity of δV / V= ±3%. this technique was applied on the Omega Laser Facility [Boehly et al., Opt. commun. 133, 495(1997)] and the National Ignition Facility [campbell and Hogan, Plasma Phys. control. Fusion 41, B39(1999)].

关键词： low mode nonuiformity nuclear fusion self-emission shadowgraphy shell trajectory

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Stochastic framework for modeling the linear apparent behavior of complex materials:Application to random porous materials with interphases

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Acta Mechanica Sinica 2013年第6期29卷 773-782页

作者： J.Guilleminot t.t.Le c.Soize Universit Paris-Est Laboratoire Modlisation et Simulation Multi EchelleMSME UMR8208 CNRS5 Bd Descartes77454 Marne la ValleFrance

this paper is concerned with the modeling of randomness in multiscale analysis of heterogeneous materials. More specifically, a framework dedicated to the stochastic modeling of random properties is first introduced. A probabilistic model for matrix-valued second-order random fields with symmetry propertries, recently proposed in the literature, is further reviewed. Algorithms adapted to the Monte carlo simulation of the proposed representation are also provided. the derivations and calibration procedure are finally exemplified through the modeling of the apparent properties associated with an elastic porous microstructure containing stochastic interphases.

关键词： Apparent properties MaxEnt Probabilistic model

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Free vibration and transient response of double curved beams connected by intermediate straight beams

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Applied Mathematics and Mechanics(English Edition) 2025年第1期46卷 37-62页

作者： R.A.JAFARI-tALOOKOLAEI H.GHANdVAR E.JUMAEV S.KHAtIR t.cUONG-LE School of Mechanical Engineering Babol Noshirvani University of Technology department of Mechanical Engineering Faculty of Engineering New Uzbekistan University University of Business and Science center for Engineering Application and technology Solutions Ho Chi Minh City Open University

this paper investigates the free vibration and transient response of interconnected structures including double curved beams and intermediate straight beams,which are all constructed from functionally graded porous(FGP) materials. the strain potential and kinetic energies of each beam along with the work done by the external force are calculated. Additionally, a higher-order beam element is introduced to derive stiffness and mass matrices, along with the force vector. the curved and straight beams are discretized, and their assembled stiffness, mass matrices, and force vectors, are *** conditions at the joints are used to derive the total matrices of the entire structure. Subsequently, the natural frequencies and transient response of the system are determined. the accuracy of the mathematical model and the self-developed computer program is validated through the comparison of the obtained results with those of the existing literature and commercial software ANSYS, demonstrating excellent ***, a comprehensive study is conducted to investigate the effects of various parameters on the free vibration and transient response of the considered structure.

关键词： Kinetic energy

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Equivalent series system to model a multiple friction pendulum system with numerous sliding interfaces for seismic analyses

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Earthquake Engineering and Engineering Vibration 2014年第1期13卷 85-99页

作者： c.S.tsai H.c.Su t.c.chiang department of civil Engineering Feng Chia University department of Water Resources Engineering and conservation Feng Chia University Earthquake Proof Systems Inc.

current structural analysis software programs offer few if any applicable device-specifi c hysteresis rules or nonlinear elements to simulate the precise mechanical behavior of a multiple friction pendulum system(MFPS) with numerous sliding *** on the concept of subsystems,an equivalent series system that adopts existing nonlinear elements with parameters systematically calculated and mathematically proven through rigorous derivations is *** aim is to simulate the characteristics of sliding motions for an MFPS isolation system with numerous concave sliding interfaces without prior knowledge of detailed information on the mobilized forces at various sliding *** MFPS with numerous concave sliding interfaces and one articulated or rigid slider located between these interfaces is divided into two subsystems: the fi rst represents the concave sliding interfaces above the slider,and the second represents those below the *** equivalent series system for the entire system is then obtained by connecting those for each subsystem in *** equivalent series system is validated by comparing numerical results for an MFPS with four sliding interfaces obtained from the proposed method with those from a previous study by Fenz and ***,these numerical results demonstrate that an MFPS isolator with numerous concave sliding interfaces,which may have any number of sliding interfaces,is a good isolation device to protect structures from earthquake damage through appropriate designs with controllable mechanisms.

关键词： seismic isolation base isolation earthquake engineering multiple friction pendulum system structural control mathematical modeling equivalent series system

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