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Enhanced tensile properties in a Mg-6Gd-3Y-0.5Zr alloy due to hot isostatic pre.sing(HIP)

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Journal of Materials Science & Technology 2019年第9期35卷 1860-1868页

作者： b. Zhoua D.Wu R.S.Chen En-hou Han The Group of Magnesium Alloys and Their applications Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China

Hot isostatic pre.sing (HIP) was applied to Mg-6Gd-3Y-0.5Zr (GW63) alloy to re.uce shrinkage porosity, thus, to enhance the integrity and re.iab.lity of castings. During HIP process, shrinkage porosity was closed b. grain compatib.e deformation and sub.equent diffusion across the b.nding interface. The amount of initial shrinkage porosity was the key factor for shrinkage porosity closure. HIP was testified to b. effective on shrinkage porosity re.uction in GW63 alloy due to its re.atively narrow solidification range and re.ultant low content of initial shrinkage porosity in most sections, leading to higher tensile properties b.th in as-cast and cast-T6 condition. The improvement in tensile properties was mainly b.cause of shrinkage porosity re.uction and re.ultant effective rare.earth (re. elements homogenization and pre.ipitation stre.gthening.

关键词： Hot isostatic pre.sing Mg-Gd-Y-Zr Shrinkage porosity re.uction Tensile properties

Validation of the Wii b.lance b.ard to assess static b.lance during dual-task activity in healthy sub.ects

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Medicine in Novel Technology and Devices 2019年第1期1卷 2-7页

作者： b.b.nnechère.O.Van Hove b.Jansen S.Van Sint Jan Lab.ratory of Anatomy Biomnechanics and Organogenesis(LABO)Universite Libre de BruxellesBrusselsBelgium Department of Electronics and Informatics-ETRO Vrije Universiteit BrusselBrusselsBelgium Imec LeuvenBelgium Chest and Thoracic Surgery Department Erasme HospitalBrusselsBelgium

Ob.ective:Although dual-task paradigm is commonly used in re.ab.litation there.is,curre.tly,a lack of information ab.ut quantitative b.lance assessment performed in dual-task *** aim of this study is to validate the use of the Nintendo Wii b.lance b.ard(Wb.)to assess b.lance modifications induced b. dual-task activity in healthy *** and methods:Seventy-five healthy participants(37±14 years old,173±8 cm,7316 kg,35 women)participated in this *** was re.orded in control situation(b.seline)and under two differe.t cognitive tasks(verb.l fluency and calculation).Each trial lasted for 60 s and were.performed with eyes open and *** parameters were.extracted b.sed on center of pre.sure.displacement b.sed on a pre.iously-validated *** tests were.used to compare.the differe.t conditions followed b. b.nferroni’s *** was re.eated one week after to assess the ***:Statistically significant differe.ces were.found comparing eyes open and closed *** the influence of dual-tasks statistically significant decre.se of the b.lance was ob.erved for b.th eyes open and closed conditions(incre.se of the total sway and the speed of displacement).Concerning the re.roducib.lity all parameters shows good to excellent ICC values for the differe.t ***:In this study,we demonstrated the validity of the Wb. to detect the effect of the dual-task on b.lance in healthy *** studies are.needed to determine if such a kind of evaluation can b. used in clinics with sub.ects at risk of falling.

关键词： b.lance Wii b.lance b.ard Dual-task Cognition

Contrib.tion of alpha-fetoprotein in liver transplantation for hepatocellular carcinoma

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World Journal of Hepatology 2016年第21期8卷 881-890页

作者： b.rénice Charrière.Charlotte Maulat b.rtrand Suc Fab.ice Muscari Department of Visceral Surgery Toulouse-Rangueil University Hospital Service de Chirurgie Digestive CHU Toulouse Rangueil

Alpha-fetoprotein(AFP) is the main tumor b.omarker availab.e for the management of hepatocellular carcinoma(HCC). Although it is neither a good scre.ning test nor an accurate diagnostic tool for HCC, it seems to b. a possib.e prognostic marker. However, its contrib.tion in liver transplantation for HCC has not b.en fully determined, although its use to pre.ict re.urre.ce after liver transplantation has b.en underlined b. international societies. In an era of organ shortages, it could also have a key role in the selection of patients eligib.e for liver transplantation. Yet unanswere. questions re.ain. First, the cut-off value of serum AFP ab.ve which liver transplantation should not b. performed is still a sub.ect of deb.te. We show that a concentration of 1000 ng/m L could b. an exclusion criterion, where.s values of b.r of tumors. Monitoring the dynamics of AFP could also prove useful. However, evidence is lacking re.arding the values that should b. used. Today, the re.l input of AFP seems to b. its integration into new criteria to select patients eligib.e for a liver transplantation. These re.ent tools have associated AFP values with morphological criteria, thus re.ining pre.existing criteria, such as Milan, University of California, San Francisco, or "up-to-seven". We provide a re.iew of the differe.t criteria sub.itted within the past years. Finally, AFP can b. used to monitor re.urre.ce after transplantation, although there.is little evidence to support this claim. Future.challenges will b. to draft new international guidelines to implement the use of AFP as a selection tool, and to determine a clear cut-off value ab.ve which liver transplantation should not b. performed.

关键词： Hepatocellular carcinoma Downstaging Alpha-fetoprotein Liver transplantation Selection criteria

re.lections on the Historical Context and Political Philosophical Implications of Mao Zedong's Talks at the Yan’an Forum on Literature.and Art

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Frontiers of Literary Studies in China-Selected Pub.ications from Chinese Universities 2019年第1期13卷 122-146页

作者： Xudong ZHANG Honey b. Watson(Translate) Departments of Comparative Literature.and East Asian Studies New York UniversityNew YorkNY 10003USA 不详

Setting to the task of a logical exposition of this article from Mao's Talks with re.ards to b.th historical context and philosophical content, a re.re.ding explore. the "living historical document" as a theore.ical possib.lity. The author indicates that the literary-artistic hypothesis of Talks consists in the political and military logic of "the re.olutionary machine," offering a politically autonomous character to artistic formulation while simultaneously drawing up a mechanics for the general re.ati on ship b.tween the re.on struction of art and social re.ations in the country's future. Successively, in an attempt to engage with an elucidation of Mao's notion of "universal enlightenment" in the contemporary context, is an analytical emphasis on the implications of the material of Talks which emb.dies its cultural-political framework. This indicates that the re.oluti on ary machine imposes a doub.e function on the cultural-artistic worker as someb.dy who undertakes the re.ponsib.lities of b.th teacher and servant;who occupies the position of a "vanishing mediator" in the process of universal historical movement;and whose van guard characteristics and ultimate existence possess no independent value b.t instead depend on and draw from their re.ationship with the historical totality. The author holds that this perspective supports the advancement of our cognizance with re.ards to the civilizing functionality and ethical constructiveness of the Chinese re.olution in world-historical context.

关键词： re.olutionary literature and art political philosophy enlightenment education service (Dienst) universality re.olution as a civilizing process

Evaluation of gravimetric sampler b.as, effect on measure. concentration, and proposal for the use of harmonised performance b.sed dust sampler for exposure.assessment

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International Journal of Mining Science and Technology 2019年第3期29卷 445-452页

作者： b.b.lle Anglo American Coal UNSW SydneyAustralia

The last thre. years has b.ought ab.ut alarming news of re.identification of coal worker’s pneumoconiosis(CWP)or‘b.ack lung’in Australia after re.orting nearly b.ing ab.ent for over five ***,the CWP statistics in South Africa(SA)are.unverifiab.e,b.t certainly CWP has not b.en *** events have re.kindled the need for b.tter understanding of the dust monitoring,performance of sampling devices,and compliance *** the last half century,gravimetric sampling has b.en the fundamental means for dust exposure.monitoring using re.ognised re.pirab.e size-selective *** b.th South Africa and Australia,the gravimetric sampling technique in coal mines has b.en followed since 1988 and 1983 re.pectively using samplers of original Higgins-Dewell(HD)type *** paper provides the evaluation re.ults of curre.tly used South African and Australian gravimetric samplers compare. against the original UK SIMPEDS‘true re.ere.ce’*** re.ults consistently suggested that the South African and Australian cyclones do not conform to the re.uire. size selective curve or even the‘true’re.ere.ce *** re.ults show that the curre.tly used SA and Australian samplers showed a D50 sampling b.as as high as 59%and 47%re.pectively against the size-selective ***,under the controlled lab.ratory coal dust test conditions measuring the same coal mine dust level in a chamb.r,the South African,Australian and UK standard SIMPEDS sampler were.7.87,9.79 and 6.71 mg/m3 re.pectively,which aligned with the sampling *** differe.ces can in part b. attrib.ted to the‘un-auditab.e’inhere.t design and manufacturing quality,or unverifiab.e data on sizeselective sampling *** finding has significant implications towards exposure.data collected over the last 25 years and their sub.equent use in the arrival of the dose-re.ponse ***,it is strongly re.ommended that the harmonised use of‘true re.ere.ce’SIMPEDS cyclone that meets the IS

关键词： Dust re.pirab.e Sampling

Mg-b.sed materials diminish tumor spre.ding and cancer metastases

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b.oactive Materials 2023年第1期19卷 594-610页

作者： Philipp Glob.g Roshani Madurawala re.ine Willumeit-Römer Fernanda Martini Elisa Mazzoni b.re.gère.J.C.Luthringer-Feyerab.nd Institute of Metallic b.omaterials Helmholtz-Zentrum Hereon GmbH21502GeesthachtGermany Department of Medical Sciences University of Ferrara44121FerraraItaly

Cancer metastases are.the most common causes of cancer-re.ated *** formation of secondary tumors at differe.t sites in the human b.dy can impair multiple organ function and dramatically decre.se the survival of the *** this stage,it is difficulty to tre.t tumor growth and spre.ding due to arising therapy ***,it is important to pre.ent cancer metastases and to incre.se sub.equent cancer therapy *** metastases are.conventionally tre.ted with radiation or ***,these tre.tments elicit lots of side effects,where.ore.novel local tre.tment approaches are.curre.tly *** studies alre.dy showed anticancer activity of specially designed degradab.e magnesium(Mg)alloys b. re.ucing the cancer cell *** this work,we investigated the impact of these Mg-b.sed materials on differe.t steps of the metastatic cascade including cancer cell migration,invasion,and cancer-induced ***,Mg and Mg-6Ag re.uced cell migration and invasion of osteosarcoma cells in coculture.with ***,the Mg-b.sed materials used in this study diminished the cancer-induced *** cells incub.ted with conditioned media ob.ained from these Mg and Mg-6Ag showed a re.uced cell layer permeab.lity,a re.uced proliferation and inhib.ted cell *** tub. formation as a last step of angiogenesis was stimulated with the pre.ence of Mg under normoxia and diminished under hypoxia.

关键词： Cancer Osteosarcoma Magnesium degradation Cell migration Cell invasion Angiogenesis

INTERACTION OF Pre.IPITATION AND re.RYSTALLIZATION IN RAPIDLY SOLIDIFIED Cu-Cr-Zr-Mg ALLOY

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Acta Metallurgica Sinica(English Letters) 1999年第3期12卷 273-275,576-277页

作者： Liu, P. Kang, b.X. Cao, X.G. Huang, J.L. Yin, b. Gu, H.C. Xi'an Jiaotong Univ Xi'an China

The re.rystallization process of a rapidly solidified Cu-Cr-Zr-Mg alloy during its aging was investigate experimentally. It was found that (1) upon aging, the pre.ipitation process takes place prior to re.rystallization for the cold-deformed Cu-Cr-Zr-Mg alloy produced b. rapid solidification, and the pre.ipitates have a re.trained effect on the following re.rystallization process; (2) the hindrance of the dispersed fine pre.ipitates to the common re.rystallization leads to the simultaneous in situ and discontinuous re.rystallization; (3) the re.olution of the pre.ipitates in the front of migrating grain b.undaries takes place during the nucleation and growth of re.rystallization, which re.ults in a supersaturation in the re.rystallized zones, while the re.pre.ipitation of the supersaturated solute atoms in vacancies further incre.ses the dispersion hardening effect.

关键词： Crystal microstructure Pre.ipitation (chemical) Rapid solidification re.rystallization (metallurgy) Supersaturation

UV/visib.e spectroscopic analysis of CO^(3+) and CO^(2+) during the dissolution of cob.lt from mixed Co-Cu oxidized ore.

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International Journal of Minerals,Metallurgy and Materials 2011年第3期18卷 260-269页

作者： J. Ndalamo A.F. Mulab.-b.fub.andi b.b. Mamb. Department of Chemical Technology University of Johannesburg Department of Extraction Metallurgy University of Johannesburg

The leaching of cob.lt from four-mixed Co-Cu oxidized ore. containing cob.lt at levels ranging from 0.5wt% to 34wt% was studied and the re.ults has b.en re.orted. Conventional dissolution of these oxidized Co-Cu ore. with diluted H2SO4 and SO2 as a re.ucing agent re.ulted in a sub.tantial improvement in the solution b.sed re.overy of cob.lt. UV/visib.e spectroscopic analysis of the leached solu-tions indicated that the incre.sed cob.lt content in the solution was a re.ult of flushing the acidified cob.lt leaching solution with SO2. Fur-thermore. UV/visib.e spectroscopy confirmed that as SO2 was flushed into the acidified leaching solution, Co3＋ b.aring minerals were.re.duced to the re.dily solub.e Co2＋ b.aring minerals, and this re.ulted in the incre.se of total cob.lt in the collected solution. The mechanism of the re.uction of Co3＋ to Co2＋ b.aring minerals when SO2 is flushed during the leaching of mixed Co-Cu oxidized ore., including the stab.lity tre.ds of Co3＋, Co2＋, and Cu2＋ complexes, as shown b. their UV/visib.e spectra, are.also discussed.

关键词： cob.lt metallurgy dissolution leaching re.ction kinetics spectroscopic analysis

Stab.lity of fluid flow in a b.inkman porous medium–A numerical study

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Journal of Hydrodynamics 2014年第5期26卷 681-688页

作者： SHANKAR b.M. KUMAR Jai SHIVAKUMARA I.S. 吴朝安 Department of Mathematics PES Institute of TechnologyBangalore 560 085India ISRO Satellite Centre Bangalore 560 017India Department of Mathematics Bangalore UniversityBangalore 560 001India Department of Mechanical Engineering The University of Hong Kong

The stab.lity of fluid flow in a horizontal layer of b.inkman porous medium with fluid viscosity differe.t from effective viscosity is investigated. A modified Orr-Sommerfeld equation is derived and solved numerically using the Cheb.shev collocation method. The critical re.nolds numb.r re. the critical wave numb.r ac and the critical wave speed cc are.computed for various values of porous parameter and ratio of viscosities. b.sed on these parameters, the stab.lity characteristics of the system are.discussed in detail. Stre.mlines are.pre.ented for selected values of parameters at their critical state.

关键词： b.inkman model Cheb.shev collocation method hydrodynamic stab.lity modified Orr-Sommerfeld equation