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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

the Isentropic Exponent of Single-Ionized Mono-Atomic Plasmas

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Plasma Science and technology 2012年第8期14卷 699-701页

作者： K.t.A.l.BURM PlasmAIX for Plasma Research Heimerik 472440 GeelBelgium

the isentropic exponent of single-ionized mono-atomic plasmas in thermal equilib- rium is studied. Its behavior as a function of the ionization degree and temperature is examined for argon and zinc plasmas at two pressures （1 bar and 1 mbar, 1 mPa and 1 Pa）, respectively. the results show that for the two sorts of plasma the isentropic exponent equals typically about 1.1-1.2 within a considerably wide range of the ionization degree （5%-80%）.

关键词： plasma modelling isentropic exponent

Application of novel constrained friction processing method to produce fine grained biomedical Mg-Zn-Ca alloy

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Journal of Magnesium and Alloys 2024年第2期12卷 516-529页

作者： ting Chen Banglong Fu Junjun Shen Uceu F.h.R.Suhuddin Björn Wiese Yuanding huang Min Wang Jorge F.dos Santos Jean Pierre Bergmann Benjamin Klusemann Solid State Materials Processing Institute of Material MechanicsHelmholtz-Zentrum HereonMax-Planck-Str.1Geesthacht 21502Germany Functional Magnesium Materials Institute of Metallic BiomaterialsHelmholtz-Zentrum HereonMax-Planck-Str.1Geesthacht 21502Germany Shanghai Key laboratory of Materials laser Processing and Modification Shanghai Jiao Tong UniversityDongchuan Road 800Shanghai 200240China Applied Materials and Manufacturing Energy and Environment DivisionPacific Northwest National LaboratoryPO Box 999RichlandWA 99352USA Production technology Group Technisiche Universität IlmenauGustav-Kirchhoff-Platz 2Ilmenau 98693Germany Institute for Production technology and Systems Leuphana University of LüneburgUniversitätsallee 1Lüneburg 21335Germany

In order to obtain Mg alloys with fine microstructures and high mechanical performances,a novel friction-based processing method,name as“constrained friction processing(CFP)”,was *** CFP,defect-free Mg-Zn-Ca rods with greatly refined grains and high mechanical properties were *** to the previous as-cast microstructure,the grain size was reduced from more than 1 mm to around 4μm within 3 s by a single process *** compressive yield strength was increased by 350%while the ultimate compressive strength by 53%.According to the established material flow behaviors by“tracer material”,the plastic material was transported by shear *** the base material to the rod,the material experienced three stages,*** by the tool,upward flow with additional tilt,followed by upward *** microstructural evolution was revealed by“stop-action”*** microstructural development at regions adjacent to the rod is mainly controlled by twinning,dynamic recrystallization(DRX)as well as particle stimulated nucleation,while that within the rod is related to DRX combined with grain growth.

关键词： Constrained friction processing Magnesium alloys Microstructure Mechanical properties Grain refinement Plastic deformation

Superconducting anisotropy and vortex pinning in CaKFe_(4)As_(4) and KCa_(2)Fe_(4)As4F_(2)

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Chinese Physics B 2021年第2期30卷 131-137页

作者： A B Yu Z huang C Zhang Y F Wu t Wang t Xie C liu h li W Peng h Q luo G Mu h Xiao l X You t hu State Key laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Beijing Academy of Quantum Information Sciences Beijing 100193China Center for high Pressure Science and technology Advanced Research Beijing 100094China CAS Center for Excellence in Superconducting Electronics(CENSE) Shanghai 200050China University of Chinese Academy of Sciences Beijing 100049China Beijing National laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Songshan lake Materials laboratory Dongguan 523808China

the vortex pinning determining the current carrying capacity of a superconductor is an important property to the applications of superconducting *** layered superconductors,the vortex pinning can be enhanced by a strong interlayer interaction in accompany with a suppression of superconducting anisotropy,which remains to be investigated in iron based superconductors(FeSCs)with the layered ***,based on the transport and magnetic torque measurements,we experimentally investigate the vortex pinning in two bilayer FeSCs,CaKFe_(4)As_(4)(Fe1144)and KCa_(2)Fe_(4)As4F_(2)(Fe12442),and compare their superconducting anisotropyγ.While the anisotropyγ≈3 for Fe1144 is much smaller thanγ≈15 in Fe12442 around tc,a higher flux pinning energy as evidenced by a higher critical current density is found in Fe1144,as compared with the case of *** combination with the literature data of Ba_(0.72)K_(0.28)Fe2As_(2) and Nd Fe As_(O0.82)F_(0.18),we reveal an anti-correlation between the pinning energy and the superconducting anisotropy in these Fe *** results thus suggest that the interlayer interaction can not be neglected when considering the vortex pinning in Fe SCs.

关键词： iron based superconductors vortex pinning anisotropy

Engineering properties of the Bukit timah Granitic residual soil in Singapore

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Underground Space 2019年第2期4卷 98-108页

作者： W.G.Zhang R.h.Zhang l.han A.t.C.Goh Key laboratory of New technology for Construction of Cities in Mountain Area Chongqing UniversityChongqingChina National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas Chongqing UniversityChongqing 400045China Key laboratory of Rock Mechanics in hydraulic Structural Engineering Ministry of EducationWuhan 430072China School of Civil Engineering Chongqing UniversityChongqingChina School of Civil and Environmental Engineering Nanyang Technological UniversitySingapore

Extensive site investigations were conducted prior to the construction of a Mass Rapid transit project in Singapore that was predominantly in the Bukit timah Granite(BtG)formation residual *** paper evaluates the engineering properties of the BtG formation residual soil based on data from 208 site investigation boreholes from four different *** on the results from 2481 conventional laboratory tests and 1192 in-situ tests,this paper summarizes the engineering properties of the highly variable BtG residual soil,including conventional composition analysis,index and hydraulic properties,and strength and deformation parameters required for geotechnical analysis and *** on these results,the BtG formation is found to be quite *** the degree of weathering decreases with depth from the top of the formation,the BtG residual soil becomes sandier,with reduced silt and clay *** coefficient of permeability and the compression index of the BtG residual soil vary *** addition,the empirical equations relating the shear strength(index)to the standard penetration test(SPt)-N,as well as the equations and charts for determining stiffness,are *** findings,together with the proposed equations or charts,can be used for design guidance of similar projects related to granitic residual soils in Singapore.

关键词： Bukit timah Granite Residual soil Shear strength Stiffness laboratory testing In-situ testing

Six novel species of Fusarium from natural ecosystems in Australia

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Fungal Diversity 2016年第2期77卷 349-366页

作者： M.h.laurence J.l.Walsh l.A.Shuttleworth D.M.Robinson R.M.Johansen t.Petrovic t.t.h.Vu l.W.Burgess B.A.Summerell E.C.Y.liew the Royal Botanic Gardens and Domain trust Mrs Macquaries RdSydneyNSW 2000Australia Faculty of Agriculture and Environment The University of SydneyEveleighNSW 2015Australia

Six new species of Fusarium associated with soil and plant hosts from ecosystems of minimal anthropogenic disturbance in Australia are *** coicis from Coix gasteenii,*** from Xanthorrhoea glauca,*** from soil and Mangifera indica,*** from soil,*** from Sorghum interjectum and *** from soil,triodia microstachya,Sorghum interjectum and Sorghum *** and phylogenetic analysis of EF-1α,RPB1 and RPB2 sequence data were used to delineate species *** new species were phylogenetically distributed in the Fusarium sambucinum,***,and *** species complexes,and two novel species *** six new species have particular phylogeographic significance as not only do they provide further insight into the geographic patterns of Fusarium evolution but also challenge current phylogeographic hypotheses.

关键词： Species diversity Endophyte Phylogenetics Mycoflora Phylogeography

Climate-influenced vector-borne diseases in Africa: a call to empower the next generation of African researchers for sustainable solutions

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贫困所致传染病(英文) 2024年第2期13卷 83-92页

作者： Obame-Nkoghe Judica?l Agossou Adjoavi Esse Mboowa Gerald Kamgang Basile Caminade Cyril Duke Dawn C. Githeko Andrew Karanja Ogega Obed M. Elloué Nestor Engone Sarr Fatou Bintou Nkoghe Dieudonné Kengne Pierre Ndam Nicaise t. Paupy Christophe Bockarie Moses Otomo Patricks Voua Molecular and Cellular Biology laboratory (labMC) Biology Department University of Science and Technology of Masuku BP Franceville Gabon Ecology and health Research Unit Interdisciplinary Center for Medical Research of Franceville BP Franceville Gabon Department of Zoology and Entomology Faculty of Natural and Agricultural Sciences University of the Free State Private Bag x13 Phuthaditjhaba Republic of South Africa laboratory of Pharmacology and Improved traditional Medicines Department of Animal Physiology Faculty of Science and Technology University of Abomey-Calavi BP Cotonou Benin the African Center of Excellence in Bioinformatics and Data-Intensive Sciences Infectious Diseases Institute College of Health Sciences Makerere University P. O Box Kampala Uganda Africa Centers for Disease Control and Prevention African Union Commission Roosevelt Street P.O. Box WKAddis Ababa Ethiopia Centre for Research in Infectious Diseases P.O. Box Yaoundé Cameroon Earth System Physics Department The Abdus Salam International Centre for Theoretical Physics Trieste Italy Africa Research Excellence Fund Charterhouse Street London EC1MHR UK Community health Support Program P.O. Box Kisumu Kenya the African Academy of Sciences Nairobi Kenya Center for Phylosophical Studies and Research (CERP) Omar Bongo University (UOB) BP Libreville Gabon UMRED Health Training and Research Unit University of Iba Der Thiam of Thiès BP Thiès Senegal National Parasitic Diseases Control Program Ministry of Health Libreville Gabon MIVEGEC Univ. Montpellier CNRS IRD Montpellier France MERIt IRD Paris Cité University Paris France Department of Parasitology Noguchi Memorial Institute for Medical Research University of Ghana LG Accra Ghana School of Community health Sciences Njala University Bo Sierra Leone

We look at the link between climate change and vector-borne diseases in low- and middle-income countries in Africa. the large endemicity and escalating threat of diseases such as malaria and arboviral diseases, intensified by climate change, disproportionately affects vulnerable communities globally. We highlight the urgency of prioritizing research and development, advocating for robust scientific inquiry to promote adaptation strategies, and the vital role that the next generation of African research leaders will play in addressing these challenges. Despite significant challenges such as funding shortages within countries, various pan-African-oriented funding bodies such as the African Academy of Sciences, the Africa Research Excellence Fund, the Wellcome trust, the U.S. National Institutes of health, and the Bill and Melinda Gates Foundation as well as initiatives such as the African Research Initiative for Scientific Excellence and the Pan-African Mosquito Control Association, have empowered (or are empowering) these researchers by supporting capacity building activities, including continental and global networking, skill development, mentoring, and African-led research. this article underscores the urgency of increased national investment in research, proposing the establishment of research government agencies to drive evidence-based interventions. Collaboration between governments and scientific communities, sustained by pan-African funding bodies, is crucial. through these efforts, African nations are likely to enhance the resilience and adaptive capacity of their systems and communities by navigating these challenges effectively, fostering scientific excellence and implementing transformative solutions against climate-sensitive vector-borne diseases.

关键词： Climate change Vector-borne diseases Africa Environmental justice Research and development Pan-African funding initiatives

-lormone levels following surgical and medical castration： defining optimal androgen suppression

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Asian Journal of Andrology 2018年第4期20卷 405-406页

作者： Michael t Schweizer Michael l hancock Robert h Getzenberg Evan Y Yu Division of Oncology Department of Medicine University of Washington Seattle WA 98116 USA Clinical Research Division Fred Hutchinson Cancer Research Center Seattle WA 98116 USA Veru healthcare Miami FL 33137 USA

Dear Editor, In the 1940s, Charles huggins discovered that surgical castration produced remarkable palliative benefits for men with advanced prostate cancer, an effect we now understand to be mediated through deprivi... 详细信息

关键词： FREE tEStOStERONE DEPRIVAtION thERAPY PROStAtE-CANCER ADRENAl-GlANDS MEN

Recent advances in the understanding and management of chronic pancreatitis pain

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Journal of Pancreatology 2024年第1期7卷 35-44页

作者： Jessica Walker Olivia l.Babyok Jami l.Saloman Anna Evans Phillips Department of Internal Medicine University of Pittsburgh Medical CenterPittsburghPAUnited States Division of Gastroenterology Hepatology and NutritionDepartment of MedicineSchool of MedicineUniversity of PittsburghPittsburghPAUnited States Center for Pain Research Center for NeuroscienceSchool of MedicineUniversity of PittsburghPittsburghPAUnited States

Abdominal pain is the most common symptom of chronic pancreatitis(CP)and is often debilitating for patients and very difficult to *** date,there exists no cure for the *** strategies focus on symptom management and on mitigation of disease progression by reducing toxin exposure and avoiding recurrent inflammatory *** treatment protocols start with medical management followed by consideration of procedural or surgical intervention on selected patients with severe and persistent *** incorporation of adjuvant therapies to treat comorbidities including psychiatric disorders,exocrine pancreatic insufficiency,mineral bone disease,frailty,and malnutrition,are in its early *** clinical studies and animal models have been designed to improve investigation into the pathophysiology of CP pain,as well as to improve pain *** the array of tools available,many therapeutic options for the management of CP pain provide incomplete *** still remains much to discover about the neural regulation of pancreas-related *** this review,we will discuss research from the last 5 years that has provided new insights into novel methods of pain phenotyping and the pathophysiology of CP *** discoveries have led to improvements in patient selection for optimization of outcomes for both medical and procedural management,and identification of potential future therapies.

关键词： Central sensitization Chronic pancreatitis Pain phenotyping Peripheral sensitization