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Achieving superior strength-ductility synergy in a heterostructured magnesium alloy via low-temperature extrusion and low-temperature annealing

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Journal of Materials Science & Technology 2023年第32期163卷 32-44页

作者： H.wang D.T.Zhang C.Qiu w.w.Zhang D.l.Chen Guangdong Key laboratory for Advanced Metallic Materials Processing and Forming National Engineering Research Center of Near-net-shape Forming for Metallic MaterialsSouth China University of TechnologyGuangzhou 510640China Department of Mechanical and Industrial Engineering Toronto Metropolitan University(formerly Ryerson University)350 Victoria StreetTorontoON M5B 2K3Canada

A low-alloyed Mg-1.2Zn-0.1Ca(wt.%)alloy was fabricated via low-temperature extrusion and annealing at 250℃for different times(10,30,and 90 min)to attain heterostructures with different fine-grained fractions,focusing on the effect of heterostructure on the mechanical *** dynamic recrystallization(RX)occurred during extrusion at 150℃,and a lamellar structure consisting of fine RX grains and coarse unRX grains was *** subsequent annealing promoted static RX in the as-extruded alloy,leading to an increased fine-grained fraction from 67%to 95%.Meanwhile,the co-segregation of Zn and Ca atoms impeded the migration of grain boundaries,thus achieving a fine grain size of 0.8–1.6μ*** sample annealed for 10 min with a fine-grained fraction of 73%and an average RX grain size of 0.9μm exhibited a superior combination of high yield strength(305 MPa)and good ductility(20%).In comparison,an excellent elongation of 30%was achieved in the alloy with a nearly fully-RXed microstructure and an average grain size of 1.6μm after 90 min annealing,despite a lower yield strength of 228 *** unRX grains,the hard orientation with(01–10)parallel to the extrusion direction and high-density dislocations made it more difficult to deform compared with the RX grains,thus producing hetero-deformation induced(HDI)*** fine grains and high-density dislocations,HDI strengthening is the key to achieving the superior mechanical properties of the low-alloyed Mg alloy.

关键词： low-alloyed magnesium alloy low-temperature extrusion Annealing Heterostructure Mechanical properties

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wound healing during hibernation by black bears (Ursus americanus) in the wild: elicitation of reduced scar formation

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Integrative Zoology 2012年第1期7卷 48-60页

作者： Paul A.IAIZZO Timothy G.lASKE henry J.HARlOw Carolyn B.McClAY David l.GARSHElIS Department of Surgery University of Minnesota Medtronic Inc Department of Zoology and Physiology University of WyomingLaramie Minnesota Department of Natural Resources USA

Even mildly hypothermic body or limb temperatures can retard healing processes in *** this,we observed that hibernating American black bears(Ursus americanus Pallas,1780)elicit profound abilities in mounting inflammatory responses to infection and/or foreign *** addition,they resolve injuries during hibernation while maintaining mildly hypothermic states(30–35°C)and without eating,drinking,urinating or *** describe experimental studies on free-ranging bears that document their abilities to completely resolve cutaneous cuts and punctures incurred during or prior to *** induced small,full-thickness cutaneous wounds(biopsies or incisions)during early denning,and re-biopsied sites 2–3 months later(near the end of denning).Routine histological methods were used to characterize these skin *** biopsied sites with respect to secondary intention(open circular biopsies)and primary intention(sutured sites)healed,with evidence of initial eschar(scab)formation,completeness of healed epidermis and dermal layers,dyskeratosis(inclusion cysts),and abilities to produce hair *** healing abilities of hibernating black bears are a clear survival advantage to animals injured before or during *** are known to have elevated levels of hibernation induction trigger(delta-opioid receptor agonist)and ursodeoxycholic acid(major bile acid within plasma,mostly conjugated with taurine)during hibernation,which may relate to these wound-healing *** research as to the underlying mechanisms of wound healing during hibernation could have applications in human *** approaches may be found to improve healing for malnourished,hypothermic,diabetic and elderly patients or to reduce scarring associated with burns and traumatic injuries.

关键词： black bear denning hair growth healing hibernation histology scarring

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An explicit solution to a three-dimensional wedge problem considering two edges effect

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Friction 2020年第2期8卷 370-383页

作者： l.GUO Z.M.ZHANG w.wANG Y.ZHAO P.l.wONG School of Mechatronic Engineering and Automation Shanghai UniversityShanghai 200444China Department of Mechanical Engineering City University of Hong KongHong Kong SARChina

The paper presents an explicit matrix algorithm to solve the problem of an elastic wedge with three loaded *** algorithm makes use of a recently published concept of transformation matrix,by which the original surface loads are converted to equivalent loads in *** three loaded edges are considered *** developed algorithm is used to study the effects of two free edges of a steel block and tapered rollers with different contact *** two load-free edges can substantially increase deformation if the two edges are close in *** results of the tapered roller simulation show that deformation is considerably sensitive to the contact angle of the tapered *** largest deformation appears at the big end of the ***,empirical formulae for correction factors for the calculation of block or quarter-space deformation based on half-space solutions are summarized.

关键词： contact mechanics two edge surfaces finite line contact tapered roller contact

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Up-conversion processes of rare earth ions in heavy metal glasses

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Journal of Rare Earths 2011年第12期29卷 1192-1194页

作者： l.Grobelny w.A.Pisarski J.Pisarska R.lisiecki w.Ryba-Romanowski Institute of Chemistry University of Silesia Institute of low Temperature and Structure Research Polish Academy of Sciences

Heavy metal lead germanate glasses doubly doped with Yb^3＋ and ln^3＋ ions （ln=Er, Tin） were investigated. Up-conversion spectra of Er^3＋ and Tm^3＋ were registered under diode-laser excitation of Yb^3＋. Up-conversion luminescence bands corresponded to ^4S3/2→^4I15/2 （green） and ^4F9/2→^4I15/2 （red） transitions of Er^3＋ as well as ^1G4→^3H6 （blue） and ^3Ha→^3H6 （N]R） transitions of Tm^3＋, respectively.

关键词： heavy metal glasses rare earth ions up-conversion luminescence

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Dual-energy X-ray absorptiometry scans accurately predict differing body fat content in live sheep

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Journal of Animal Science and Biotechnology 2019年第1期10卷 248-253页

作者： David w Miller Ellen J Bennett Joanne l Harrison Fiona Anderson Clare l Adam School of Veterinary and life Sciences Murdoch University Scotland’s Rural College (SRUC) Peter Wilson Building The Faculty of Health University of Tasmania School of Biological Sciences University of Aberdeen Rowett Institute of Nutrition and Health University of Aberdeen

Background: There is considerable interest in implementing mobile scanning technology for on-farm body composition analysis on live *** experiments evaluated the use of dual energy X-ray absorptiometry(DXA) as an accurate method of total body fat measurement in live ***: In Exp.1,visceral and whole body fat analysis was undertaken in sheep with body condition scores(BCS)in the range 2 to 3.25(scale 1: thin to 5: fat).The relationship of BCS was moderately correlated with visceral fat depot mass(r = 0.59,P whole body fat(r = 0.70,P with BCS in the range 2.25 to 3.75 were blood sampled to analyse circulating leptin concentrations,and were DXA scanned immediately post mortem for total body *** leptin concentrations had low correlations with BCS(r = 0.50,P lation with chemical body fat(r = 0.17,P > 0.05,n = 9).There was a moderate correlation between DXA body fat and BCS(r = 0.70,P was highly correlated with chemical body fat(r = 0.81,P week intervals,was performed on growing sheep over a 32-week *** average BCS ranged from 2.39 ± 0.07(S.E.M.) to 3.05 ± 0.11 and the DXA body fat(%) ranged from 16.8 ± 0.8 to 24.2 ± *** was a moderate correlation between DXA body fat and BCS over the 32 weeks(r = 0.61,P lusions: Overall,these experiments indicated that there was good agreement between BCS,DXA and chemical analysis for measuring total body fat in sheep,and that DXA scanning is a valid method for longitudinal measurement of total body fat in live sheep.

关键词： BCS DEXA Fat leptin longitudinal Sheep

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联机检索入门

联机检索入门

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作者： w.M.·亨利(w.M. henry)

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Recent progress and new developments of applications of artificial intelligence (AI), knowledge-based systems (KBS), and Machine learning (Ml) in the petroleum industry

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Petroleum 2020年第4期6卷 I0001-I0002页

作者： Paitoon(PT)Tontiwachwuthikul Christine w.Chan Fanhua(Bill)Zeng Zhiwu(henry)liang Teerawat Sema Chao Min Canadian Academy of Engineering(FCAE) Clean Energy Technologies Research Institute(CETRi)University of ReginaSKCanada Canadian Academy of Engineering(FCAE) Canada Research Chair Tier I in Energy and Environmental Informatics(2006-2020)Energy Informatics LaboratoryUniversity of ReginaSKCanada Faculty of Graduate Studies and Research University of ReginaSKCanada Joint International Center for CO2 Capture&Storage(iCCS) Hunan UniversityChangshaHunan410082China Sustainable Multiphase ARtificial-intelligence Technology(SMART)laboratory Department of Chemical TechnologyChulalongkorn UniversityBangkokThailand Institute for Artificial Intelligence Southwest Petroleum UniversityChengduChina

Over the past two decades,broad-based and intense efforts have been devoted to apply concepts and methodologies from information technology(IT)and artificial intelligence(AI)to informatics research related to energy and environmental *** academic research and industrial practices have generated an impressive amount of literature,which spans virtually every aspect of synergistic work among these *** and systems analysis techniques are now being widely used by the practicing engineers and scientists to solve a broad range of problems in the petroleum *** at the world Economic Forum at Davos Switzerland in 2017,Ginni Rometty,IBM′CEO at that time(now Executive Chairperson of IBM),described AI's role in the partnership between humans and machines as“augmented cognition.”In other words,AI not only supports but augments human cognition so that humans can be more efficient and“do a better job”[1,2].This should also be true and very beneficial for the petroleum industry.

关键词： devoted petroleum knowledge

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Non-invasive evaluation of lower urinary tract symptoms(lUTS)in men

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Asian Journal of Urology 2018年第1期5卷 42-47页

作者： Reshma Mangat henry S.S.Ho Tricia l.C.Kuo Department of Urology Singapore General HospitalSingapore

lower urinary tract symptoms(lUTS)are common in males over the age of 40 years old and are likely to increase with an aging *** urodynamic studies are the gold standard to determine the aetiology of voiding dysfunction and ***,due to its invasive nature,a great number of non-invasive ultrasound based investigations have been developed to assess patients with symptomatic *** clinical application of noninvasive tests could potentially stratify patients who would require more invasive investigations and allow more precise patient directed treatment.A PubMed literature review was performed and we will discuss the non-invasive investigations that have been developed thus far,focusing on bladder wall and detrusor wall thickness(BwT&DwT),ultrasound estimated bladder weight(UEBw)and intravesical prostatic protrusion(IPP).

关键词： Bladder outlet obstruction Benign prostatic enlargement Intravesical prostatic protrusion lower urinary tract symptoms Bladder wall thickness Ultrasound estimated bladder weight Near infrared spectroscopy

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Hf isotope composition of zircons and implication for the petrogenesis of Yajiangqiao granite,Hunan Province,China

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Chinese Science Bulletin 2003年第10期48卷 995-998页

作者： wANGXiang w.l.Griffin wANGZhicheng ZHOUXinmin DepartmentofEarthSciencesandStateKeylaboratoryforMineralDepositResearch NanjingUniversityNanjing210093China GEMOCKeyCenter DepartmentofEarthandPlanetarySciencesMacquarieUniversitySydneyNSW2109Australia

In the peralumineous granite of Yajiangqiao zircon population can be divided into two groups (i.e. Zircon Ⅰ and Zircon Ⅱ), which were formed in magmatic chamber and in emplacement place, respectively. The Hf isotope compositions of two stages of zircon show that the host magma was essentially derived from crustal material by melting. However, some higher 176Hf/177Hf ratios indicate that the granitic zircons should contain fine crystal of zircon formed in mantle-derived magma. In fact, the backscattered electron imaging and the electron microprobe analysis reveal that there is another type of zircon included within Zircon Ⅰ, which is quite different from Zircon Ⅰ and Zircon Ⅱ in morphology and chemistry. They are considered to be the product of the mantle-derived magma intruded into the granitic magma chamber at the beginning of anatexis. Thus, it is suggested that the formation of Yajiangqiao granite is related to the underplating of mantle magma.

关键词： Hf 铪同位素锆石岩石成因学花岗岩底侵作用

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ElECTROANAlYTICAl APPlICATIONS OF CARBOXYl-MODIFIED CARBON NANOTUBE FIlM ElECTRODES

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Acta Metallurgica Sinica(English letters) 2003年第4期16卷 289-294页

作者： C.G.Hu w.l.wang K.J.liao w.Zhu DepartmentofAppliedPhysics ChongqingUniversityChongqing400044China KeylaboftheEducationMinistryforPhotoelectricTechnologyandSystem ChongqingUniversityChongqing400044China DepartmentofChemistry ChongqingUniversityChongqing400044ChinaManuscriptreceived25November2002

The electrochemical behavior of a carboxyl-modified carbon nanotube films was investigated to explore its possibility in electroanalytical applicaton. Cyclic voltammetry of quinone was conducted in 1mol/l Na2SO4, which showed a stable, quasi-reversible voltammetric response for quinone / hydroquinone, and the anodic and the cathodic peak potentials were 0.657V and -0.029V (vs. SCE) at a scan rate of 0.1V.s-1, respectively. Both anodic and cathodic peak currents depended linearly on the square root of the scan rate over the range of 0.01-0.5V.s-1, which suggested that the process of the electrode reactions was diffusion-controlled. Carboxyl-modified carbon nanotube electrodes made it possible to determine low level of dopamine selectively in the presence of a large excess of ascorbic acid in acidic media using derivative voltammetry. The results obtained were discussed in details. This work demonstrates the potential of carboxyl-modified carbon nanotube electrodes for electroanalytical applications.

关键词： carbon nanotube electrochemistry carboxyl modification dopamine

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