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Impedance spectroscopy study on Mn_(1+x)Fe_(2-2x)Ti_xO_4(0≤x≤0.5) ferrites

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journal of central south University 2010年第6期17卷 1133-1138页

作者： kUMAR s BATOO k M PRAkAsH R cHOI H k kOO B H sONG j I chung H jEONG H LEE c G school of Nano and Advanced Materials Engineering Changwon National UniversityChangwon 641773Korea king Abdullah Institute for Nanotechnology King Saud UniversityRiyadh 11451Saudi Arabia Department of Mechanical Engineering Changwon National UniversityChangwon 641773Korea Department of Precision & Mechanical Engineering and Bk21 Eco-Friendly Heat & cold Energy Mechanical Research Team Gyeongsang National U niversityTongyeong 650160Korea

The complex impedance spectroscopy and surface morphology of Mn1+xFe2-2xTixO4(0≤x≤0.5) system,prepared using a conventional solid state reaction technique,were *** impedance spectroscopy measurements were carried out at room temperature in the frequency range of 42-5 *** electrical processes in the samples were modeled in the form of an equivalent circuit made up of a combination of two parallel Rc circuits attributed to grain and grain *** Dc conductivity obtained by extrapolation of Ac data using impedance spectroscopy and four-probe method increases at 10% doping of Ti *** energy-dispersive X-ray(EDX) pattern confirmed the homogeneous mixing of the Mn,Fe,Ti and O atoms in pure and doped ferrite samples.

关键词： spinel ferrite magnetic properties impedance spectroscopy Ti4+ ions doping

cORROsION BEHAVIOR OF A ZIRcONIUM-TITANIUM BAsED PHOsPHONIc AcID cONVERsION cOATING ON AA6061 ALUMINIUM ALLOY

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Acta Metallurgica sinica(English Letters) 2008年第4期21卷 269-274页

作者： s.H. wang c.s. Liu F.j. shan key Laboratory for Anisotropy and Texture of Materials Ministry of Education Northeastern University Shenyang 110004 China Material ＆ chemical Engineering college Liaoning University of Technology Jinzhou 121001 China

The conversion coating was formed by dipping AA6061 in a fluorotitanate/zirconate acid and amino trimethylene phosphonic acid （ATMP） solution at room temperature. The formation process and the anti-corrosion performance of the conversion coating were investigated using electrochemical test and salt spray test （ssT）, respectively. The electrochemical test shows that the Zr/Ti and ATMP coating improves the corrosion resistance of AA6061 as good as the chromate （VI） coating. But the results of ssT show that the corrosion resistance of Zr/Ti and ATMP coating is not as good as the chromate （VI） coating. The corrosion area is less than 2% after 72 h.

关键词： corrosion resistance Fluorotitanate/zireonate acid Phosphonic acid Aluminium alloy conversion coating

Grain refinement in low sFE and particle-containing nickel aluminium bronze during severe plastic deformation at elevated temperatures

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journal of Materials science & Technology 2021年第23期82卷 57-68页

作者： c.j.Barr k.Xia Department of Mechanical Engineering University of MelbourneVictoria3010Australia DMTc Ltd. 24 Wakefield St.HawthornVIC3122Australia

The influence of particle size and morphology on grain refinement in low stacking fault energy(sFE)alloys was studied by comparing the grain structures in single-and multi-phase Al-bronze(AB)alloys following equal channel angular pressing(EcAP)between 350 and 500℃.In particular,nickel aluminium bronze(NAB)was chosen as it contained both coarse and fine rounded particles,as well as a lamellar phase which evolved during *** refinement in the single-phase alloy was achieved through dynamic recrystallisation initiated at deformed twin *** contrast,different mechanisms were observed in the particle-containing *** around the coarseκⅡparticles(~5μm)was promoted through particle stimulated nucleation(PsN),whereas recrystallisation in the region of the fineκⅣ(~0.4μm)was delayed due to the activation of secondary *** refinement in areas of the lamellarκⅢshowed significant variation,depending on the lamellar orientation relative to the shear plane of *** the lamellae deformed,numerous high angle grain boundaries were generated between fragments and served as nucleation sites for recrystallisation,while PsN occurred around spheroidised *** spreading of theκⅢparticles by EcAP then enhanced the total area of recrystallised grains.

关键词： Equal channel angular pressing copper alloys Grain refinement stacking fault energy severe plastic deformation

comparison of microstructure and mechanical behavior of Ti-35Nb manufactured by laser powder bed fusion from elemental powder mixture and prealloyed powder

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journal of Materials science & Technology 2022年第10期105卷 1-16页

作者： j.c.wang Y.j.Liu s.X.Liang Y.s.Zhang L.Q.wang T.B.sercombe L.c.Zhang school of Engineering Edith Cowan University270 Joondalup DriveJoondalupPerthWA 6027Australia school of Engineering M050The University of Western Australia35 Stirling HighwayCrawleyPerthWA 6009Australia Northwest Institute for Nonferrous Metal Research Xi’an 710016China state key Laboratory of Metal Matrix composites School of Material Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Although different types of powder feedstock are used for additive manufacturing via laser powder bed fusion(L-PBF),limited work has attempted to directly compare the microstructure and mechanical behavior of components manufactured from those powder *** work investigated the microstructure,phase composition,melt pool morphology,and mechanical properties of a prealloyed Ti-35Nb alloy manufactured using L-PBF and compared these to their counterparts produced from elemental powder *** samples manufactured from the powder mixture are composed of randomly distributed undissolved Nb in theα/βmatrix,resulting from the unstable melt pool during the melting of the powder *** contrast,parts produced from prealloyed powder display a homogeneous microstructure withβandαphases,owing to the full melting of prealloyed powder,therefore,a more stable melt pool to achieve a homogeneous *** Ti-35Nb manufactured from prealloyed powder exhibits large tensile ductility(about 10 times that of the counterparts using mixed powder),attributed to the high homogeneity in microstructure and chemical composition,strong interface bonding,relatively low oxygen content,and the existence of a large amount ofβ*** work sheds insights into understanding the effect of powder feedstock on the melt pool stability therefore the microstructure and mechanical behavior of the resultant parts.

关键词： Titanium-niobium Powder bed fusion Additive manufacturing Melt pool stability Microstructure Mechanical properties

secure Probabilistic Prediction of Dynamic Thermal Line Rating

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journal of Modern Power systems and clean Energy 2022年第2期10卷 378-387页

作者： N.safari s.M.Mazhari c.Y.chung s.B.ko Grid Operations support SaskPower.ReginaSKS4P 0S1Canada the Department of Electrical and computer Engineering University of SaskatchewanSaskatoonSKS7N 5A9Canada

Accurate short-term prediction of overhead line(OHL)transmission ampacity can directly affect the efficiency of power system operation and *** overcstiniation of the dynamic thermal line rating(DTLR)can lead to the lifetime degradation and failure of OHLs,safety hazards,*** paper presents a secure yet sharp probabilistic model for the hour-ahead prediction of the *** security of the proposed DTLR limits the frequency of DTLR prediction exceeding the actual *** model is based on an augmented deep learning architecture that makes use of a wide range of predictors,including historical climatology data and latent variables obtained during DTLR ***,by introducing a customized cost function,the deep neural network is trained to consider the DTLR security based on the required probability of exceedance while minimizing the deviations of the predicted DTLRs from the actual *** proposed probabilistic DTLR is developed and verified using recorded experimental *** simulation results validate the superiority of the proposed DTLR compared with the state-of-the-art prediction models using well-known evaluation metrics.

关键词： Deep neural network dynamic thermal line rating overhead line prediction recurrent neural network

Machine learning guided automatic recognition of crystal boundaries in bainitic/martensitic alloy and relationship between boundary types and ductile-to-brittle transition behavior

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journal of Materials science & Technology 2021年第25期84卷 49-58页

作者： X.c.Li j.X.Zhao j.H.cong R.D.k.Misra X.M.wang X.L.wang c.j.shang collaborative Innovation center of steel Technology University of Science and Technology BeijingBeijing 100083China Department of Metallurgical Materials and Biomedical EngineeringUniversity of Texas at El Paso500 W.University AvenueEl PasoTX 79968USA

Gradient boosting decision tree(GBDT)machine learning(ML)method was adopted for the first time to automatically recognize and conduct quantitative statistical analysis of boundaries in bainitic microstructure using electron back-scatter diffraction(EBsD)*** spite of lack of large sets of EBsD data,we were successful in achieving the desired accuracy and accomplishing the objective of recognizing the *** with a low model accuracy ofs using Euler angles or axis-angle pair as characteristic features,the accuracy of the model was significantly enhanced to about 88%when the Euler angle was converted to overall misorientation angle(OMA)and specific misorientation angle(sMA)and considered as important *** this model,the recall score of prior austenite grain(PAG)boundary was~93%,high angle packet boundary(OMA>40°)was~97%,and block boundary was~96%.The derived outcomes of ML were used to obtain insights into the ductile-to-brittle transition(DBTT)***,ML modeling approach suggested that DBTT was not determined by the density of high angle grain boundaries,but significantly influenced by the density of PAG and packet *** study underscores that ML has a great potential in detailed recognition of complex multi-hierarchical microstructure such as bainite and martensite and relates to material performance.

关键词： Machine learning Feature engineering Automatic recognition Lath structure crystallography

A Note on the Dynamics of the Logistic Family Modified by Fuzzy Numbers

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Acta Mathematicae Applicatae sinica 2022年第4期38卷 741-752页

作者： j.s.cáNOVAs Department of Applied Mathematics and statistics Technical University of CartagenaC/Doctor Flemming Sn30202CartagenaSpain

In this paper,we consider a modification of the well-known logistic family using a family of fuzzy *** dynamics of this modified logistic map is studied by computing its topological entropy with a given *** computation allows us to characterize when the dynamics of the modified family is ***,some attractors that appear in bifurcation diagrams are ***,we will show that the dynamics induced by the logistic family on the fuzzy numbers need not be complicated at all.

关键词： logisitic family topological entropy chaos Zadeh's extension fuzzy numbers

study of commercial Wheat Flour Milling Process:Relation of Flour Yield,Ash and Protein contents of Flour Mill and characteristics of Wheat Blend

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食品科学 2006年第11期27卷 146-152页

作者： Y s kim c W Deyoe O k chung E Haque Department of Grain science and Industry Kansas State University (KSU) Manhattan 66506 Kansas StateU.S. Key Laboratory ofFood Science and Safety Ministry of Education School of Food Science and Technology Southern YangtzeUniversity Wuxi 214036 China Department of Grain science and Industry Kansas State University (KSU) Manhattan 66506 Kansas StateU.S. Hard Winter Wheat Quality Laboratory Grain Marketing and Production Research Center AgriculturalResearch Service U.S. Department of Agriculture Manhattan 66502 Kansas State U.S.

The profit margin in the flour milling industry is quite narrow,so high-quality raw materials and efficiency of milling operations are crucial for every company. Many flour mills,especially those which import wheat from other countries and have limited storage space for the different varieties or classes of wheat,can not afford to buy low quality wheat. consequently,a mathematical model which can test the impact and interactions of raw materials,in technical point of view,would be a useful decision-making tool for the milling industry. A flour miller tests wheat for physical and chemical characteristics,cleanness and soundness. The miller also performs experimental milling,if available,to have some idea how the given wheat will behave during commercial milling. Based on these test results,the miller can only guess the commercial milling results such as flour yields and flour ash and protein contents. Thus,the objective of this study was to develop empirical equations to estimate commercial milling results,using the physical,chemical and experimental milling data of the given wheat blend and also,additionally,flour ash and protein specifications of the end-user. This was done by using the actual commercial milling procedures and their wheat physical,chemical,experimental milling data,and other vital data. Data were collected from a commercial mill located in East Asia that had four production lines and used wheat blend combinations from five different wheat classes,i.e. Hard Red Winter (HRW),Dark Northern spring (DNs),soft White (sW),Australian soft (As),and Australian standard White (AsW) wheat to produce over 40 different products. The wheat physical and chemical characteristics included test weight,thousand kernel weight,ash and protein contents. The experimental milling data were straight-grade and patent flour yields,along with patent flour ash and protein contents from a Buhler experimental mill. The commercial milling results included the flour yields of paten

关键词： study of commercial Wheat Flour Milling Process sFA BPP

Microstructure and mechanical properties of Al-12si and Al-3.5cu-1.5Mg-1si bimetal fabricated by selective laser melting

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journal of Materials science & Technology 2020年第1期36卷 18-26页

作者： P.wang c.s.Lao Z.W.chen Y.k.Liu H.wang H.Wendrock j.Eckert s.scudino Additive Manufacturing Institute College of Mechatronics and Control EngineeringShenzhen UniversityNanhai Street 3688518060ShenzhenP.R.China Institute for complex Materials IFW DresdenHelmholtzstraβe 20D-01069DresdenGermany Guangdong Provincial key Laboratory ofMicro/Nano Optomechatronics Engineering College of Mechatronics and Control EngineeringShenzhen University Nanhai Street 3688518060ShenzhenP.R.China Erich schmid Institute of Materials science Austrian Academy of SciencesJahnstraJie 12A-8700LeobenAustria Department of Materials science Montanuniversitat LeobenJahnstraJSe 12A-8700LeobenAustria

An Al-12 si/Al-3.5 cu-1.5 Mg-1 si bimetal with a good interface was successfully produced by selective laser melting(sLM).The sLM bimetal exhibits four successive zones along the building direction:an Al-12 si zone,an interfacial zone,a texture-strengthening zone and an Al-cu-Mg-si *** interfacial zone(ck)displays an increasing size of the cells composed of eutectic Al-si and a discontinuous cellular microstructure,resulting in the lowest hardness of the four *** texturestrengthening zone(around 0.3 mm thick)shows a remarkable variation of the hardness andfiber *** backscatter diffraction analysis shows that the grains grow gradually from the interfacial zone to the Al-cu-Mg-si zone along the building ***,a strongfiber texture develops at the Al-cu-Mg-si side of the interfacial zone and disappears gradually along the building *** bimetal exhibits a room temperature yield strength of 267±10 MPa and an ultimate tensile strength of 369±15 MPa with elongation of 2.6±0.1%,revealing the potential of selective laser melting in manufacturing dissimilar materials.

关键词： selective laser melting Aluminum alloys Bimetals Microstructure Mechanical properties