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| 1 | ANALYSIS ON THE BEHAVIOR OF PRECIPITATES IN ULTRA-THIN HOT STRIP OF PLAIN LOW CARBON STEEL PRODUCED BY COMPACT STRIP PRODUCTION显示文摘This paper investigated the mechanism of precipitation and its influence upon prop-erties of ultra-thin hot strips of low carbon steel produced by CSP techniques usingexperiment and thermodynamics theory. The experimental results show that thereare lots of fine and dispersive precipitates in microstructures. By analysis, most ofaluminum nitrides are in grains, while coexisted precipitates of MnS are along grainboundaries. Coexisted precipitates compose cation-vacancy type oxides such as Al2O3in the core, while MnS is at the fringe of surface. The precipitation behavior of AlNand MnS in the hot strip is studied by thermodynamic calculation. At last, implica-tions between strengthening effect and techniques are analyzed using obtained solubilityproducts. | H.Yu,Y.L.Kang,H.B.Dong,D.L.Liu and J.FuUniversity of Science and Technology Beijing, Beijing 100083, China Manuscript received 10 October 2001 in revised form 25 January 2002 | 2002 | Acta Metallurgica Sinica(English Letters)2002，15，4： | 11 |
| 2 | Effects of fibers on expansive shotcrete mixtures consisting of calcium sulfoaluminate cement,ordinary Portland cement,and calcium sulfate显示文摘The mining industry often uses shotcrete for ground stabilization. However, cracking within shotcrete is commonly observed, which delays production schedules and increases maintenance costs. A possible crack reduction method is using expansive shotcrete mixture consisting of calcium sulfoaluminate cement(CSA), ordinary Portland cement(OPC), and calcium sulfate(CS) to reduce shrinkage. Furthermore, fibers can be added to the mixture to restrain expansion and impede cracking. The objective of this paper is to study the effects of nylon fiber, glass fiber, and steel fiber on an expansive shotcrete mixture that can better resist cracking. In this study, parameters such as density, water absorption, volume of permeable voids, unconfined compressive strength(UCS), splitting tensile strength(STS), and volume change of fiber-added expansive mixtures were determined at different time periods(i.e. the strengths on the 28 th day, and the volume changes on the 1 st, 7 th, 14 th, 21 st, and 28 th days). The results show that addition of fibers can improve mixture durability, in the form of decreased water absorption and reduced permeable pore space content. Moreover, the expansion of the CSA-OPC-CS mixture was restrained up to50% by glass fiber, up to 43% by nylon fiber, and up to 28% by steel fiber. The results show that the STS was improved by 57% with glass fiber addition, 43% with steel fiber addition, and 38% with nylon fiber addition. The UCS was also increased by 31% after steel fiber addition, 26% after nylon fiber addition, and16% after glass fiber addition. These results suggest that fiber additions to the expansive shotcrete mixtures can improve durability and strengths while controlling expansion. | H.Yu L.Wu W.V.Liu Y.Pourrahimian | 2018 | Journal of Rock Mechanics and Geotechnical Engineering2018，10，2： | 6 |
| 3 | The effect of Co and Cr substitutions for Ni on mechanical properties and plastic deformation mechanism of FeMnCoCrNi high entropy alloys显示文摘The elastic constants,ideal tensile strength(ITS),stacking fault energy(SFE),lattice constant and magnetic moment of FeMnCoCrNi high entropy alloys with varying Co and Cr contents at 0 and 300 K were systematically investigated by first-principle calculations.For the alloys with Co substitution for Ni,at both temperatures the elastic stability of the face-centered cubic(fcc)phase,bulk elastic modulus(B),Young’s modulus(E),shear modulus(G)and ITS increase monotonically with increasing Co content.However,the Cauchy pressure(Cp),Pugh ratio(B/G),Poisson ratio(v),Zener anisotropy ratio(AZ)and elastic anisotropy ratio(AVR)decrease monotonically.The SFE also decreases with the increase of Co,resulting in the change of plastic deformation mechanism from dislocation slip to mechanical twinning,and then to hcp-martensitic transformation.This elucidates the underlying mechanism of the effect of Co addition on the strength and micromechanical behavior of FeMnCoCrNi alloys.Compared with Co,the Cr substitution for Ni leads to the more complex change of elastic constants and ITS.The increase of Cr shows the similar effect on SFE and deformation mechanism as that of Co.The variation of valence electron concentration and magnetism affect the SFE.The increase of either Co or Cr leads to the reduced magnetic moments of Fe and Mn.This could be responsible for the monotonic decrease of both lattice constant and SFE as the Co content increases.However,for the Cr addition case,multiple factors may affect the evolution of lattice constant and SFE.These findings shed light on the deformation mechanism of the alloys with different compositions. | H.F.Zhang H.L.Yan H.Yu Z.W.Ji Q.M.Hu N.Jia | 2020 | Journal of Materials Science & Technology2020，47，13： | 5 |
| 4 | FUNCTIONAL POLYHYDROXYALKANOATES SYNTHESIZED BY MICROORGANISMS显示文摘Many bacteria have been found to synthesize a family of polyesters termed polyhydroxyalkanoate, abbreviated asPHA. Some interesting physical properties of PHAs such as piezoelectricity, non-linear optical activity, biocompatibility andbiodegradability offer promising applications in areas such as degradable packaging, tissue engineering and drag delivery.Over 90 PHAs with various structure variations have been reported and the number is still increasing. The mechanicalproperty of PHAs changes from brittle to flexible to elastic, depending on the side-chainlength of PHA. Many attempts havebeen made to produce PHAs as biodegradable plastics using various microorganisms obtained from screening naturalenvironments, genetic engineering and mutation. Due to the high production cost, PHAs still can not compete with the non-degradable plastics, such as polyethylene and polypropylene. Various processes have been developed using low cost rawmaterials for fermentation and an inorganic extraction process tbr PHA purification. However, a super PHA production strainmay play the most critical role for any large-scale PHA production. Our recent study showed that PHA synthesis is acommon phenomenon among bacteria inhabiting various locations, especially oil-contaminated soils. This is very importantfor finding a suitable bacterial strain for PHA production. In fact, PHA production strains capable of rapid growth and rapidPHA synthesis on cheap molasses substrate have been found on molasses contaminated soils. A combination of novelproperties and lower cost will allow easier commercialization of PHA for many applications. | Peter H.Yu | 2000 | Chinese Journal of Polymer Science2000，18，5： | 4 |
| 5 | Detection and widespread distribution of sodium channel alleles characteristic of insecticide resistance in Culex pipiens complex mosquitoes in China显示文摘 | Z.‐M.WANG C.‐X.LI D.XING Y.‐H.YU N.LIU R.‐D.XUE Y.‐D.DONG T.‐Y.ZHAO | 2012 | Medical and Veterinary Entomology2012，，2： | 2 |
| 6 | Posterior circulation ischemic stroke in Korean population显示文摘 | J.‐H.Lee S.‐J.Han Y.‐H.Yun H.‐C.Choi S.Jung S.‐J.Cho K.‐H.Yu S. M.Lee S.‐H.Hwang H.‐K.Song K. H.Kwon B.‐C.Lee | 2006 | European Journal of Neurology2006，，7： | 2 |
| 7 | 'Context-based hierarchical unequal merging for SAR image segmentation,'显示文摘 | H.Yu X.Zhang S.Wang H.Biao | | 0，，02： | 1 |
| 8 | Tailoring precipitation/properties and related mechanisms for a high-strength aluminum alloy plate via low-temperature retrogression and re-aging processes显示文摘The retrogression and re-aging(RRA)processes,aimed mainly at tailoring intergranular precipitates,could significantly improve the corrosion resistance(i.e.,stress corrosion cracking resistance)without considerably decreasing the strength,which signifies that an efficient control of the size,distribution and evolution of intergranular and intragranular precipitates becomes critical for the integrated properties of the(mid-)thick high-strength Al alloy plates.Compared to RRA process with retrogression at200℃ (T77),this study investigated the impact of a modified RRA process(MT77)with lower retrogression temperatures(155-175℃ )and first-stage under-aging on the properties of a high-strength AA7050 Al alloy,in combination with detailed precipitate characterization.The study showed that the strength/microhardness of the RRA-treated alloys decreased with raising retrogression temperature and/or prolonging retrogression time,along with the increased electrical conductivity.The rapid responsiveness of microstructure/property typical of retrogression at 200℃ was obviously postponed or decreased by using MT77 process with longer retrogression time that was more suitable for treating the(mid-)thick plates.On the other hand,higher retrogression temperature facilitated more intragranularηprecipitates,coarse intergranular precipitates and wide precipitate free zones,which prominently increased the electrical conductivity alongside a considerable strength loss as compared to the MT77-treated alloys.With the preferred MT77 process,the high strength approaching T6 level as well as good corrosion resistance was achieved.However,though a relatively homogeneous through-thickness strength was obtained,some small discrepancies of properties between the central and surface areas of an 86-mm thick 7050 Al alloy plate were observed,possibly related to the quenching sensitivity.The precipitate evolution and mechanistic connection to the properties were discussed and reviewed for high-strength Al alloys along with suggestions for further RRA optimization. | L.G.Hou H.Yu Y.W.Wang L.You Z.B.He C.M.Wu D.G.Eskin L.Katgerman L.Z.Zhuang J.S.Zhang | 2022 | Journal of Materials Science & Technology2022，，25： | 1 |
| 9 | TOURISM, DUTCH DISEASE AND WELFARE IN AN OPEN DYNAMIC ECONOMY*显示文摘 | CHI‐CHURCHAO BHARAT R.HAZARI JEAN‐PIERRELAFFARGUE PASQUALE M.SGRO EDEN S. H.YU | 2006 | Japanese Economic Review2006，，4： | 1 |
| 10 | Prediction of pregnancy complications by first‐trimester maternal serum PAPP‐A and free β‐hCG and with second‐trimester uterine artery Doppler显示文摘 | KevinSpencer Christina K. H.Yu Nicholas J.Cowans ChinezeOtigbah Kypros H.Nicolaides | 2005 | Prenat Diagn2005，，10： | 1 |
| 11 | “The impact of national culture and economic ideology on managerial work values:A study of the united states显示文摘 | Ralston David A. Holt David H. Terpstra Robert H.Yu Kai-Cheng | 1997 | Russia Japan and China”1997，，01： | 1 |
| 12 | The levels of CD4+CD25+ regulatory T cells in paediatric patients with allergic rhinitis and bronchial asthma显示文摘 | J.‐H.Lee H.‐H.Yu L.‐C.Wang Y.‐H.Yang Y.‐T.Lin B.‐L.Chiang | 2007 | Clinical & Experimental Immunology2007，，1： | 1 |
| 13 | Posterior circulation ischemic stroke in Korean population显示文摘 | J.‐H.Lee S.‐J.Han Y.‐H.Yun H.‐C.Choi S.Jung S.‐J.Cho K.‐H.Yu S. M.Lee S.‐H.Hwang H.‐K.Song K. H.Kwon B.‐C.Lee | 2006 | European Journal of Neurology2006，，7： | 1 |
| 14 | Development of dual‐compartment perfusion bioreactor for serial coculture of hepatocytes and stellate cells in poly(lactic‐co‐glycolic acid)‐collagen scaffolds显示文摘 | F.Wen S.Chang Y. C.Toh T.Arooz L.Zhuo S. H.Teoh H.Yu | 2008 | J Biomed Mater Res2008，，1： | 1 |
| 15 | The effects of service climate and the effective leadership behaviour of supervisors on frontline employee service quality: A multi‐level analysis显示文摘 | C. HarryHui Warren C. K.Chiu Philip L. H.Yu KevinCheng Herman H. M.Tse | 2010 | Journal of Occupational and Organizational Psychology2010，，1： | 1 |
| 16 | Posterior circulation ischemic stroke in Korean population显示文摘 | J.‐H.Lee S.‐J.Han Y.‐H.Yun H.‐C.Choi S.Jung S.‐J.Cho K.‐H.Yu S. M.Lee S.‐H.Hwang H.‐K.Song K. H.Kwon B.‐C.Lee | 2006 | European Journal of Neurology2006，，7： | 1 |
| 17 | Challenge in understanding size and shape dependent toxicity of gold nanomaterials in human skin keratinocytes显示文摘 | S.Wang W.Lu O.Tovmachenko U.S.Rai H.Yu P.C.Ray | | 0，，： | 1 |
| 18 | Circulating endothelial microparticles in acute ischemic stroke: a link to severity, lesion volume and outcome显示文摘 | J.SIMAK M. P.GELDERMAN H.YU V.WRIGHT A. E.BAIRD | 2006 | Journal of Thrombosis and Haemostasis2006，，： | 1 |
| 19 | Selective conversion of CO_(2)to CO using earth abundant tin modified copper gas diffusion electrodes显示文摘Earth-abundant copper-tin(CuSn)electrocatalysts are potential candidates for cost-effective and sustainable production of CO from electrochemical carbon dioxide reduction(eCO_(2)R).However,the requirement of highoverpotential for obtaining reasonable current,low Faradaic efficiencies(FE)and low intrinsic catalytic activities require the optimisation of the CuSn nanoarchitecture for the further advancement in the field.In the current work,we have optimised Sn loading on Cu gas diffusion electrodes(GDEs)by electrochemical spontaneous precipitation.Samples with various Sn loadings were tested in a three-chamber GDE reactor to evaluate their CO_(2)reduction performances.The best performance of 92%CO Faradaic efficiency at a cathodic current density of 120 mA cm^(-2)was obtained from the 20 min Sn deposited Cu_(2)O sample operated at-1.13 V vs.RHE.The electrocatalyst had~13%surface coverage of Sn on Cu GDE surface,and had Sn in oxide form and copper in metallic form.The catalyst also showed stable performance and was operable for>3 h under chronoamperometric conditions.The surface of the GDE reduces from Cu2O to Cu during eCO_(2)R and goes further reconstruction during the eCO_(2)R.This study demonstrates the potential of Cu-Sn for selective CO production at high current densities. | Preetam K.Sharma Shahid Rasul Da Li Eileen H.Yu | 2023 | Materials Reports(Energy)2023，3，2： | 0 |
| 20 | Design and optimization of the composition and mechanical properties for non-equiatomic CoCrNi medium-entropy alloys显示文摘The development of multi-principal element alloys(MPEAs,also called as high-or medium-entropy al-loys,HEAs/MEAs)provides tremendous possibilities for materials innovation.However,designing MPEAs with desirable mechanical properties confronts great challenges due to their vast composition space.In this work,we provide an essential criterion to efficiently screen the CoCrNi MEAs with outstanding strength-ductility combinations.The negative Gibbs free energy difference△E_(FCC-BCC)between the face-centered cubic(FCC)and body-centered cubic(BCC)phases,the enhancement of shear modulus G and the decline of stacking fault energy(SFE)γ_(isf)are combined as three requisites to improve the FCC phase stability,yield strength,deformation mechanisms,work-hardening ability and ductility in the criterion.The effects of chemical composition on△E_(FCC-BCC),G andγisf were investigated with the first principles calculations for Co_(x)Cr_(33)Ni_(67-x),Co_(33)Cr_(y)Ni_(67-y)and Co_(z)Cr_(66-z)Ni_(34)(0≤x,y≤67 and 0≤z≤66)alloys.Based on the essential criterion and the calculation results,the composition space that displays the neg-ative Gibbs free energy difference△E_(FCC-BCC),highest shear modulus G and lowest SFEγ_(isf)was screened with the target on the combination of high strength and excellent ductility.In this context,the optimal composition space of Co-Cr-Ni alloys was predicted as 60 at.%-67 at.%Co,30 at.%-35 at.%Cr and 0 at.%-6 at.%Ni,which coincides well with the previous experimental evidence for Co_(55)Cr_(40)Ni_(5)alloys.The valid-ity of essential criterion is further proved after systematic comparison with numerous experimental data,which demonstrates that the essential criterion can provide significant guidance for the quick exploitation of strong and ductile MEAs and promote the development and application of MPEAs. | J.X.Yan Z.J.Zhang P.Zhang J.H.Liu H.Yu Q.M.Hu J.B.Yang Z.F.Zhang | 2023 | Journal of Materials Science & Technology2023，，8： | 0 |
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