检索结果-南通市图书馆

Effects of Milling and Heat Treatment on the Synthesis of NiTi Powders

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2017年第5期32卷 1156-1162页

作者： A R Sadeghi H Mostajabodaveh A Babakhani M S Abravi A salehi Materials Research Group Iranian Academic Center for EducationCulture and Research(ACECR)Mashhad BranchP.O.Box 91779-49367MashhadIran Faculty of Metallurgical and Materials Engineering Semnan UniversityP.O.Box 35131-19111SemnanIran Department of Materials and Metallurgical Engineering School of EngineeringFerdowsi University of MashhadP.O.Box 91775-1111MashhadIran

This work reports on the production of Ni-50 at% Ti powders by a planetary ball mill in various times（0.5, 1, 2, 6, 20, 36, 54 and 120 h） and subsequent heat treatment in Ar atmosphere at 820 °C. Study of powders structure after milling and heat treatment was carried out by scanning electron microscopy and X-ray diffractometry. According to the results, after milling for 6 hours NiTi phase formed, and by the milling evolution up to 54 h, it became the dominant phase. It was found that by the milling development, a layer structure in powder particles was formed, also by increasing the milling time a more homogeneous structure was obtained. Amorphous Ni Ti transformed into ordered Ni Ti, Ni_3Ti, NiTi_2 and minor TiO_2 and TiO after heat treatment at 820 °C for 1 h.

关键词： NiTi milling amorphous heat treatment

Mathematical model for iron corrosion that eliminates chemical potential parameters

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2020年第2期28卷 603-612页

作者： Hadi Seddiqi Ali Sadatshojaie Behzad Vaferi Ehsan Yahyazadeh Afshin salehi David AWood Department of Chemical and Petroleum Engineering Sharif University of TechnologyP.O.Box 11365-11155TehranIran Young Researchers and Elite Club Shiraz BranchIslamic Azad UniversityShirazIran Department of Chemistry Sharif University of TechnologyP.O.Box 11365-11155TehranIran DWA Energy Limited BassinghamLincoln LNS 9JPUnited Kingdom

Iron corrosion in acidic media is a natural phenomenon that converts elemental iron to a more chemically-stable form,*** oxide and *** this study,the iron corrosion process is modeled as a completely implicit problem,solved by a novel finite difference model to provide insight into the ionic aspects of corrosion *** new mathematical model eliminates the chemical potential parameters from the corrosion process equations,thereby reducing the need for experimental determination of chemical *** eliminatedchemical-potential-parameters model predicts and quantifies key parameters(concentrations of conjugate base ion,iron(Ⅱ)ion,hydrogen ion,anodic and cathodic potentials,and the electrical current density)associated with the iron corrosion process in acidic *** rigorous derivation and novel application of the eliminated-chemical-potential-parameters model and its results provide new insights into the iron corrosion *** present model is also applicable in any industrial process which is associated with metal *** model helps to guide the design of future corrosion resistant systems,and various experimental studies pertaining to corrosion inhibition techniques.

关键词： Finite difference modeling Implicit solution Iron corrosion process Modeling corrosion process Transient numerical simulation

Effect of Pearlite Interlamellar Spacing on Predominant Abrasive Wear Mechanism of Fully Pearlitic Steel

在线全文

学校读者我要写书评

暂无评论

材料热处理学报 2004年第5B期25卷 1207-1213页

作者： J. Ahmadi M. Monirvaghefi M. salehi B. Niroumand Merat poolad engineering company Isfahan IranIsfahan University of Technology Department of materials engineering Isfahan IranIsfahan University of Technology Department of materials engineering Isfahan IranIsfahan University of Technology Department of materials engineering Isfahan Iran

The aim of this investigation was the determination of the predominant wear mechanism on three-body abrasion of fully pearlitic low alloy steel. Furthermore, the effect of pearlite interlamellar spacing on wear behavior was investigated. For this purpose, the samples were subjected to the different heat treating to attaining different interlamellar spacing. Mechanical properties such as hardness, yield strength, tensile strength, elongation, and impact toughness were evaluated. Three body abrasion tests were conducted under ASTM standard condition using a rubber wheel abrasion test apparatus. Abraded surface and wear debris were investigated by light optical microscopy and scanning electron microscopy. The results showed that wear resistance of fully pearlitic steel depended to pearlite interlamellar spacing the and lower spacing has the greater wear resistance, so it may be due to subsurface work hardening and interlamellar spacing and cementite in fine and/or coarse pearlite, that influence on surface destruction during wear. Although during wear process the several mechanisms play roles, but study of surface and debris shows that with decreasing interlamellar spacing, the predominant mechanism wear changed from ploughing to cutting mode.

关键词：层间距珠光体三体磨损钢

Speckle filtering of Synthetic Aperture Radar images using filters with object-size-adapted windows

在线全文

学校读者我要写书评

暂无评论

International Journal of Digital Earth 2018年第7期11卷 703-729页

作者： Sahel Mahdavi Bahram salehi Cecilia Moloney Weimin Huang Brian Brisco C-CORE Faculty of Engineering and Applied ScienceMemorial University of NewfoundlandSt John’sNLCanada Department of Electrical Engineering Faculty of Engineering and Applied ScienceMemorial University of NewfoundlandSt.John’sNLCanada Canada Center for Mapping and Earth Observation OttawaONCanada

Speckle degrades the radiometric quality of a Synthetic Aperture Radar(SAR)*** methods for speckle reduction have used a fixedsize window for filtering the entire ***,however,may not be effective for the entire image,as land covers of different sizes require different filtering *** this paper,a novel method is proposed by which each pixel in the image is filtered with a window appropriate for the size of object within *** real in-phase and the imaginary quadrature components of the SAR images determine the best window size and the pixels in the intensity image are filtered using their own optimal *** proposed method is presented for both singleand multi-polarized SAR images,and the results of several common filters that were modified are *** approach is applied to two RADARSAT-2 images:one over San Francisco,California,USA and the other over ***’s,Newfoundland and Labrador,Canada,producing results that were similar to,or outperformed,comparable filters while retaining details and suppressing speckle *** the method was successful for single-look intensity data,it offers great potential for multi-look and amplitude data as well.

关键词： Speckle Synthetic Aperture Radar(SAR) filters adaptive window size

Impact strength and structural refinement of A380 aluminum alloy produced through gas-induced semi-solid process and Sr addition

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2022年第5期32卷 1405-1415页

作者： M.HONARMAND M.salehi S.G.SHABESTARI H.SAGHAFIAN School of Metallurgy and Materials Engineering Iran University of Science and Technology(IUST)NarmakTehranIran

Semi-solid processing of A380 aluminum alloy was performed by gas induced semi-solid(GISS)*** effects of argon inert gas flow rate,starting temperature and duration of gas purging as key GISS parameters and also modification with Sr on the structural refinements,hardness and impact strength of GISS alloys were *** evolution shows that there is an important effect of the pouring temperature and Sr addition on the morphology and size of primaryα(A1)in the alloy to change from coarse dendritic to fine globular *** best sample which has fine grains of 51.18μm in average size and a high level of globularity of 0.89 is achieved from a GISS processing of Sr modified alloy in which the gas purging started at 610℃.The impact strength of the GISS optimized samples((4.67±0.18)J/cm^(2))shows an increase of about 40%with respect to the as-cast sample due to the globular structure and fibrous Si ***,the hardness of the optimized GISS sample((89.34±2.85)HB)increases to(93.84±3.14)HB by modification with the Sr and GISS *** fracture surface of Sr modified alloy is also dominated by complex topography showing typical ductile fracture features.

关键词： gas-induced semi-solid process impact strength A380 aluminium alloy globular structure modification

Recent progress and perspectives in additive manufacturing of magnesium alloys

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2022年第6期10卷 1511-1541页

作者： Zhuoran Zeng Mojtaba salehi Alexander Kopp Shiwei Xu Marco Esmaily Nick Birbilis College of Engineering and Computer Science Australian National UniversityACT.2601 Australia Additive Manufacturing Group Singapore Institute of Manufacturing Technology(SIMTech)Agency forScienceTechnology and Research(A∗STAR)73 Nanyang Drive637662 Singapore Meotec GmbH Philipsstr.8AachenGermany State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsh1410082 China Department of Materials Science and Engineering Massachusetts Institute of TechnologyCambridgeMA 02139United States of America Volvo Materials Technology Laboratory Volvo GroupLundbyGothenburg 41715Sweden

Magnesium alloys remain critical in the context of light-weighting and advanced devices. The increased utilisation of magnesium(Mg)each year reveals growing demand for its Mg-based alloys. Additive manufacturing(AM) provides the possibility to directly manufacture components in net-shape, providing new possibilities and applications for the use of Mg-alloys, and new prospects in the utilisation of novel physical structures made possible from ‘3D printing’. The review herein seeks to holistically explore the additive manufacturing of Mg-alloys to date, including a synopsis of processes used and properties measured(with a comparison to conventionally prepared Mg-alloys). The challenges and possibilities of AM Mg-alloys are critically elaborated for the field of mechanical metallurgy.

关键词： Magnesium Additive manufacturing Microstructure 3D printing Mechanical properties Electrochemical properties

Association of risky driving behavior with psychiatric disorders among Iranian drivers:A case-control study

在线全文

学校读者我要写书评

暂无评论

中华创伤杂志:英文版 2023年第5期26卷 290-296页

作者： Kiana Khatami Yaser Sarikhani Reza Fereidooni mohammad salehi-Marzijarani Maryam Akabri Leila Khabir Arash Mani Mahsa Yaghikosh Afsaneh Haghdel Seyed Taghi Heydari Kamran Bagheri Lankarani Health Policy Research Center Institute of HealthShiraz University of Medical SciencesShirazIran Research Center for Social Determinants of Health Jahrom University of Medical SciencesJahromIran Research Center for Psychiatry and Behavioral Sciences Shiraz University of Medical SciencesShirazIran Department of Psychology Shiraz BranchIslamic Azad UniversityShirazIran

Purpose:This study aimed to investigate the possible association between psychological disorders and riskydriving behavior(RDB)in ***:This case-control study conducted in Shiraz,Iran in *** case group included drivers with psychological disorders and the control group included those without any *** inclusion criteria for selecting patients were:active driving at the time of the study,being 18-65 years old,having a driving license,having a psychological disorder including depression,bipolar disorder,anxiety spectrum disorder,or psychotic disorder spectrum confirmed by a psychiatrist,and completing an informed consent *** exclusion criterion was the existence of conditions that interfered with answering and understanding the *** inclusion criteria for selecting the healthy cases were:active driving at the time of the study,being 18-65 years old,having a driving license,lack of any past or present history of psychiatric problems,and completing an informed consent *** data were gathered using a researcher-made checklist and Manchester driving behavior ***,partition around medoids method was used to extract clusters of ***,backward logistic regression was applied to investigate the association between the independent variables and the clusters of ***:The sample comprised of 344(153 with psychological disorder and 191 without confirmed psychological disorder)*** elimination logistic regression on total data revealed that share of medical expenditure≤10%of total household expenditure(OR=3.27,95%Cl:1.48-7.24),psychological disorder(OR=3.08,95%Cl:1.67-5.70),and substance abuse class(OR=6.38,95%CI:3.55-11.48)wereassociatedwithhighlevelof ***:Substance abuse,psychological illnesses,and share of medical costs from total household expenditure were found to be main predictors of *** investigations are necessary to explain the impact of different psychological illnesses on driv

关键词： Risky driving behavior Psychological disorder Manchesterdriving behaviorquestionnaire Iran

Leptopsylla algira costai(Siphonaptera:Leptopsyllidae):New host and new geographical record

在线全文

学校读者我要写书评

暂无评论

Journal of Coastal Life Medicine 2016年第12期4卷 953-954页

作者： Ali Yousefi mohammad Naser Ghorbani Sadegh salehi-Guilandeh Young Researchers and Elites Club Science and Research BranchIslamic Azad UniversityTehranIran Department of Microbiology Science and Research BranchIslamic Azad UniversityTehranIran Department of Pathobiology School of Veterinary ScienceBu-Ali Sina UniversityHamedanIran

Objective:To access the emerging ectoparasites associated with shrews in Hamedan Province of ***:We have captured bicoloured white-toothed shrews[Crocidura leucodon(***)]using the live traps in April *** collected by brushing the skins were removed and preserved in 70%ethanol containing 5%glycerin,and subsequently they were sent to the parasitology laboratory and *** fleas isolated from infested specimen were cleared in 10%aqueous potassium hydroxide,dehydrated in ethanol,cleared in xylene,mounted in Canada balsam and identified using reliable ***:In general,eight fleas(one male,seven females)were collected from *** in Hamedan Province,Western *** fleas were identified as Leptopsylla algira costai Smit,***:Fleas are medically important because they transmit a wide variety of diseases to their *** addition,this aricle reports Leptopsylla algira costai for the first time in new host(***)and new geographical region(Iran).

关键词： Flea Siphonaptera Parasite Crocidura leucodon Iran

Influnce of Stoichiometry and Molar Ratio of Barium Ferrite Thin Film Synthesized by Sol-gel on Alumina Substrate

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

材料热处理学报 2004年第5B期25卷 1313-1315页

作者： AliGhasemi M.R.Shams A.Saatchi M.salehi A.Hosseinpour MaterialsEngineeringDepartment IsfahanuniversityofTechnologyIsfahanIran ElectroceramicResearchcenter ShahinshahrIran MaterialsEngineeringDepartment IsfahanuniversityofTechnologyIsfahanIran／／ElectroceramicResearchcenterShahinshahrIran

Amorphous gels were processed with a varying Fe/Ba ratio of 11/5, 28/2, 10.5/1 in water and Solvent. Iron and barium nitrites with specific molar ratio was solved in water and slovent at 60°C for 3 hours until! a dark brown solution was prepared . The sols were introduced to substrate dropwise and spinning with 2000 rpm in 3 min was applied ; the work was repeated for 10 times and the samples were dried and sintered . The TGA analysis was used to identify the heating rate of the samples; at temperature of 1150°c for one hour the final phase was attained . the thickness , uniformity , morphology and the composition were examined by SEM and XRD. The study shows that the fabrication barium ferrite film of the molar ratio of Fe/Ba = 10.5/1 is much more suitable than other ratios .

关键词：溶胶凝胶钡铁氧体摩尔比率氧化铝基片