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Recent innovations in laser additive manufacturing of titanium alloys

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International Journal of Extreme manufacturing 2024年第3期6卷 2-37页

作者： Jinlong Su Fulin Jiang Jie Teng Lequn Chen ming Yan Guillermo Requena Lai-Chang Zhang Y morris Wang Ilya v Okulov Hongmei Zhu Chaolin Tan College of materials Science and Engineering Hunan UniversityChangsha 410082People’s Republic of China Singapore Institute of manufacturing Technology(SIm Tech) Agency for ScienceTechnology and Research(A∗STAR)5 Cleantech LoopSingapore 636732Singapore Department of materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055People’s Republic of China Institute of materials Research German Aerospace Center(DLR)Linder Höhe51147 CologneGermany Centre for Advanced materials and manufacturing Edith Cowan University270 Joondalup DriveJoondalupPerthWestern Australia 6027Australia Department of materials Science and Engineering University of CaliforniaLos AngelesCA 900095United States of America Leibniz Institute for materials Engineering-IWT Badgasteiner Str.328359 BremenGermany Faculty of Production Engineering University of BremenBadgasteiner Str.128359 BremenGermany Key Laboratory of Hunan Province of Equipment Safety Service Technology under Extreme Environment University of South ChinaHengyangPeople’s Republic of China RWTH Aachen University Metallic Structures and Materials Systems for Aerospace EngineeringD-52062 AachenGermany

Titanium(Ti)alloys are widely used in high-tech fields like aerospace and biomedical *** additive manufacturing(LAm),as an innovative technology,is the key driver for the development of Ti *** the significant advancements in LAm of Ti alloys,there remain challenges that need further research and development *** recap the potential of LAm high-performance Ti alloy,this article systematically reviews LAm Ti alloys with up-to-date information on process,materials,and *** feasible solutions to advance LAm Ti alloys are reviewed,including intelligent process parameters optimization,LAm process innovation with auxiliary fields and novel Ti alloys customization for *** auxiliary energy fields(***,acoustic,mechanical deformation and magnetic fields)can affect the melt pool dynamics and solidification behaviour during LAm of Ti alloys,altering microstructures and mechanical *** kinds of novel Ti alloys customized for LAm,like peritecticα-Ti,eutectoid(α+β)-Ti,hybrid(α+β)-Ti,isomorphousβ-Ti and eutecticβ-Ti alloys are reviewed in ***,machine learning in accelerating the LAm process optimization and new materials development is also *** review summarizes the material properties and performance envelops and benchmarks the research achievements in LAm of Ti *** addition,the perspectives and further trends in LAm of Ti alloys are also highlighted.

关键词： additive manufacturing titanium alloys auxiliary field machine learning aerospace materials lightweight materials novel alloys

Effect of process parameters on SPRC35 spot welded automotive panels

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Acta metallurgica Sinica(English Letters) 2010年第3期23卷 185-190页

作者： m.Balasubramanian v.Balasubramanian Department of mechanical Engineering Velammal Engineering College Department of manufacturing Engineering Annamalai University

This paper presents an experimental study on the resistance spot weldability of SPRC35（steel plate re-phosphorised cold rolled） *** sheets were joined by using resistance spot welding as lap *** weld nugget diameter and tensile shear force were ***-shear tests were applied to the welded specimens to understand the tensile shear force that the joint can *** relationships were developed for both nugget diameter and tensile shear *** of automatic mode, will increase the dependence on the use of equations to predict the nugget *** developed models have been checked for their adequacy and significance by the F test and t test *** results obtained from the empirical relationships have been optimized and also tested using conformity test runs.

关键词： Resistance spot welding SPRC35 steel

A Novel Synthesis of malic Acid Capped Silver Nanoparticles using Solanum lycopersicums Fruit Extract

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Journal of materials Science & Technology 2013年第4期29卷 317-322页

作者： m.Umadevi m.R.Bindhu v.Sathe Department of Physics Mother Teresa Women's UniversityKodaikanal 624 102Tamil NaduIndia UGC-DAE Consortium for Scientific Research University CampusKhandwa RoadIndore 452 017India

Integration of green chemistry principles to nanotechnology is one of the key issues in nanoscience research. The development of the concept of green nanoparticle preparation has been growingly needed for environmentally benign metal nanoparticle synthesis protocols to avoid adverse effects in medical applications. Keep this in mind, in the present study, silver nanoparticles were synthesized using Solanum lycopersicums fruit extract. The prepared silver nanoparticles were characterized by Uv-visible spectroscopy, Fourier transform infrared spectroscopy, Raman spectroscopy, scanning electron microscopy and transmission electron microscopy techniques. The surface plasmon resonance peak was found at 445 nm. The synthesized silver nanoparticles were spherical in shape with the average size of 10 nm. The citric acid present in S. lycopersicums fruit extract acted as reducing agent and malic acid was responsible for capping of the bioreduced silver nanoparticles.

关键词： Silver nanoparticles Solanum lycopersicums Uv--visible spectroscopy Fourier transform infrared spectroscopy Ramanspectroscopy

Evaluation of Zero and Sub-zero Temperature Tensile and Impact Properties of Quenched and Tempered Steel Weldments

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Journal of Iron and Steel Research International 2016年第11期23卷 1177-1187页

作者： m.BALAKRISHNAN v.BALASUBRAmANIAN m.A.mUTHU mANICKAm Department of mechanical Engineering M.Kumarasamy College of Engineering(Autonomous)ThalavapalayamKarur 639113Tamil NaduIndia Center for materials Joining&Research(CEmAJOR) Department of Manufacturing EngineeringAnnamalai UniversityAnnamalainagar 608002Tamil NaduIndia Combat vehicles Research and Development Establishment(CvRDE) AvadiChennai 600054Tamil NaduIndia

Combat vehicles using armour grade quenched and tempered （Q＆T） steel are needed to be operated under different climatic conditions. However, the properties meeting the room temperature test conditions may not neces-sarily be required to meet the low temperature operating conditions. The influences of shielded metal arc welding （SmAW） process, flux cored arc welding （FCAW） processes and test temperatures below room temperature up to 60℃ on tensile and impact toughness properties of armour grade Q＆T steel welds were reported. The tensile and impact properties of the joints showed incremental trend with respect to the decrement in test temperature up to -40℃ irrespective of the welding processes used. The increment in tensile and impact properties of SmAW and FCAW joints subjected to the low temperature environment is due to plastic strain-induced phase transformation of retained austenite into martensite phase. Among the two processes, SmAW process welded joint showed better tensile and impact properties than its FCAW counterpart joints.

关键词： shielded metal arc welding flux cored arc welding low temperature property microstrncture: hardness

Calculation and Analysis of velocity and viscous Drag in an Artery with a Periodic Pressure Gradient

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Chinese Journal of mechanical Engineering 2012年第4期25卷 715-721页

作者： ALIZADEH m SEYEDPOUR S m mOZAFARI v BABAZADEH Shayan S Department of mechanical Engineering Iran University of Science and TechnologyTehranIran Department of mechanical Engineering Islamic Azad University of Science and ResearchTehranIran Department of mechanical Engineering Tarbiat Modares UniversityTehranIran

Blood as a fluid that human and other living creatures are dependent on has been always considered by scientists and *** changes in blood pressure and its normal velocity can be a sign of a *** significant in blood fluid＇s mechanics is Constitutive equations and finding some relations for analysis and description of drag,velocity and periodic blood pressure in *** this paper,by considering available experimental quantities,for blood pressure and velocity in periodic time of a thigh artery of a living dog,at first it is written into Fourier series,then by solving Navier-Stokes equations,a relation for curve drawing of vessel blood pressure with rigid wall is *** in another part of this paper,vessel wall is taken in to consideration that vessel wall is elastic and its pressure and velocity are written into complex Fourier *** this case,by solving Navier-Stokes equations,some relations for blood velocity,viscous drag on vessel wall and blood pressure are *** this study by noting that vessel diameter is almost is large（3.7 mm）,and blood is considered as a Newtonian ***,available experimental quantities of pressure with obtained curve of solving Navier-Stokes equations are *** blood analysis in rigid vessel,existence of 48% variance in pressure curve systole peak caused vessel blood flow analysis with elastic wall,results in new relations for blood flow *** Resultant curve is obtained from new relations holding 10% variance in systole peak.

关键词： artery newtonian fluid rigid & elastic wall newtonian fluid

Photoelectrochemical activity of ZnO:Ag/rGO photo-anodes synthesized by two-steps sol-gel method

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Chinese Physics B 2022年第5期31卷 691-702页

作者： D Ben Jemia m Karyaoui m A Wederni A Bardaoui m v martinez-Huerta m Amlouk R Chtourou Laboratory of Nanomaterials and Renewable Energy Systems LANSER Research and Technology Center of EnergyBorj-Cedria Science and Technology ParkBP 952050 Hammam-LifTunisia Faculty of Science of Tunis University of Tunis El ManarTunisia Laboratory of Physics of materials and Nanomaterials Applied to the Environment(LaPhymNE) Faculty of Sciences of GabesCite ErriadhUniversity of Gabes6079 GabesTunisia lnstitute of Catalysis and Petrochemistry CSICin MadridSpain Laboratory of Nanomaterials Nanotechnology and Energy(L2NE)University of Tunis El ManarTunisia

This work investigated the influence of silver plasmon and reduced graphene oxide(r GO)on the photoelectrochemical performance(PEC)of Zn O thin films synthesized by the sol-gel *** physicochemical properties of the obtained photo-anodes were systematically studied by using several characterization *** x-ray diffraction analysis showed that all samples presented hexagonal wurtzite structure with a polycrystalline *** and energy dispersive x-ray(EDX)studies confirmed the existence of both Ag and r GO in Zn O:Ag/r GO thin *** estimated grain size obtained from scanning electron microscopy(SEm)analysis decreased with Ag doping,then increased to a maximum value after r GO *** Uv-vis transmission spectra of the as-prepared Zn O:Ag and Zn O:Ag/r GO thin films have shown a reduction in the visible range with a redshift at the absorption *** bandgaps were estimated to be around 3.17 e v,2.7 e v,and 2.52 e v for Zn O,Zn O:Ag,and Zn O:Ag/r GO,***,the electrical measurements revealed that the charge exchange processes were enhanced at the Zn O:Ag/r GO/electrolyte interface,accompanied by an increase in the(PEC)performance compared to Zn O and Zn O:Ag ***,the photocurrent density of Zn O:Ag/r GO(0.2 m A·cm^(-2)) was around 4 and 2.22 times higher than photo-anodes based on undoped Zn O(0.05 m A·cm^(-2)) and Zn O:Ag(0.09 m A·cm^(-2)),***,from the flat band potential and donor density,deduced from the mott-Schottky,it was clear that all the samples were n-type semiconductors with the highest carrier density for the Zn O:Ag/r GO photo-anode.

关键词： zinc oxide reduced graphene oxide silver doping sol-gel photoelectrochemical performance

Effect of process parameters of pulsed current tungsten inert gas welding on weld pool geometry of titanium welds

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Acta metallurgica Sinica(English Letters) 2010年第4期23卷 312-320页

作者： m.Balasubramanian v.Jayabalan v.Balasubramanian Department of mechanical Engineering Velammal Engineering CollegeSurapetAnna University Department of manufacturing Engineering Anna University Centre for materials Joining & Research Department of Manufacturing EngineeringAnnamalai University

The effects of pulsing current parameters on weld pool geometry namely front height, back height, front width and back width of pulse current gas tungsten arc welded （GTAW） titanium alloy was analysed. Four factors, five levels, central composite design were used to develop empirical relationships, incorporating pulsed current parameters and weld pool geometry.

关键词： Gas tungsten arc welding Pulsed current Titanium alloy Design of experiments

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阿柏西普治疗糖尿病黄斑水肿患者的临床研究

中国临床药理学杂志 2024年第9期40卷 1335-1335页

作者： BROWN D m BOYER D S DO D v 孟海峰

本研究为一项随机、双盲、非劣效性的Ⅱ/Ⅲ期临床试验。研究对象为患有1型或2型糖尿病,并伴有中心累及糖尿病黄斑水肿(DmO)成年患者。在最初的每月给药后,患者按照1:2:1的比例随机分为试验1组(玻璃体内注射2mg,每8周1次)、试验2组(玻璃... 详细信息

本研究为一项随机、双盲、非劣效性的Ⅱ/Ⅲ期临床试验。研究对象为患有1型或2型糖尿病,并伴有中心累及糖尿病黄斑水肿(DmO)成年患者。在最初的每月给药后,患者按照1:2:1的比例随机分为试验1组(玻璃体内注射2mg,每8周1次)、试验2组(玻璃体内注射8mg每12周1次)和试验3组(玻璃体内注射8mg每16周1次)。

关键词：玻璃体内注射 Ⅲ期临床试验糖尿病黄斑水肿阿柏西普成年患者 2型糖尿病非劣效性双盲

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“新神话”作为中华民族历史的保存方式

欧亚人文研究（中俄文） 2024年第1期 74-83,92页

作者：玛·瓦·贝利科娃首都师范大学

本文采用跨学科的方法,探讨了在国家和文化发展范式发生变异、社会构建的原则和规律发生变化的背景下,寻求文化认同和民族自决的新途径问题。人性深处信奉人道主义是文化进步的主要动力。或许,这一思想在当今的东方文化中更为突出。东... 详细信息

本文采用跨学科的方法,探讨了在国家和文化发展范式发生变异、社会构建的原则和规律发生变化的背景下,寻求文化认同和民族自决的新途径问题。人性深处信奉人道主义是文化进步的主要动力。或许,这一思想在当今的东方文化中更为突出。东方文化符号的特点包括对世界的非理性态度、感性认识、传统的神话。与西方文化相比,中国传统文化体系具有强大的文化记忆,能够创造出“新神话”,其核心是作为家庭、民族、社会体成员的人。通过家庭,中国人代代相传,即使远离故土,依然保存其文化的“公理内核”,这是流淌在血液里的文化基因。美籍华裔女作家谭恩美的作品将传统神话与新神话相结合,诠释这样的真谛:源自外部世界并被中国社会所掌握的新事物也不能根本改变中国文化的独特性及其元素的本义。

关键词：全球一体化民族文化认同人道主义中国传统文化体系新神话