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Microstructure and Mechanical Properties of Dissimilar Double-Side Friction Stir Welds Between Medium-Thick 6061-T6 Aluminum and Pure copper Plates

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Acta Metallurgica Sinica(English Letters) 2022年第12期35卷 2027-2046页

作者： j.X.tang L.Shi c.S.Wu M.X.Wu S.Gao MOE Key Lab for Liquid-Solid Structure Evolution and Materials Processing Institute of Materials JoiningShandong UniversityJinan 250061China State Grid Henan Electric Power Research Institute Zhengzhou 450052China School of Mechanical Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan250353China

It is difficult to achieve Al/cu dissimilar welds with good mechanical properties for medium-thick plates due to the inherent high heat generation rate at the shoulder-workpiece contact interface in conventional friction stir ***,doubleside friction stir welding is innovatively applied to join 12-mm medium-thick 6061-T6 aluminum alloy and pure copper dissimilar plates,and the effect of welding speeds on the joint microstructure and mechanical properties of Al/cu welds is systematically *** reveals that a sound Al/cu joint without macroscopic defects can be achieved when the welding speed is lower than 180 mm/min,while a nonuniform relatively thick intermetallic compound(IMc)layer is formed at the Al/cu interface,resulting in lots of local microcracks within the first-pass weld under the plunging force of the tool during friction stir welding of the second-pass,and seriously deteriorates the mechanical properties of the *** the increase of welding speed to more than 300 mm/min void defects appear in the joint,but the joint properties are still better than the welds performed at low welding speed conditions since a continuous uniform thin IMcs layer is formed at the Al/cu *** maximum tensile strength and elongation of Al/cu weld are,respectively,135.11 MPa and 6.06%,which is achieved at the welding speed of 400 mm/*** addition,due to the influence of welding distortion of the first-pass weld,the secondpass weld is more prone to form void defects than the first-pass weld when the same plunge depth is applied on both *** double-side friction stir welding is proved to be a good method for dissimilar welding of medium-thick Al/cu plates.

关键词： Double-side friction stir welding Medium-thick plate Dissimilar welding Microstructures Intermetallic compounds Mechanical properties

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基于热处理工艺的拖拉机发动机铝合金组织性能研究

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农机化研究 2025年第1期47卷 243-247页

作者：汤金金李好娜济源职业技术学院河南济源454650 郑州大学济源研究院河南济源454650

采用不同时长的热处理工艺,对拖拉机发动机铝合金组织性能进行了对比分析。结果表明:热处理后,铝合金性能得到了较大程度的提高,若优先考虑材料性能,则应该采用180℃×4 h的单级热处理时效;若优先考虑工艺效率和成本,则可以采用150℃×1... 详细信息

采用不同时长的热处理工艺,对拖拉机发动机铝合金组织性能进行了对比分析。结果表明:热处理后,铝合金性能得到了较大程度的提高,若优先考虑材料性能,则应该采用180℃×4 h的单级热处理时效;若优先考虑工艺效率和成本,则可以采用150℃×1 h+170℃×1 h的双级热处理时效。

关键词：热处理工艺拖拉机发动机铝合金组织性能

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Zika virus and neural developmental defects: building a case for a cause

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Science china(Life Sciences) 2016年第5期59卷 536-538页

作者： Sarah c Ogden christy Hammack Hengli tang Department of Biological Science Florida State University

Zika virus （ZIKV）, a little-known .flavivirus until a few months ago, is currently at the forefront of public health concerns worldwide because of its suspected role in causing microcephaly and other developmental defects in fetuses of infected mothers. On February 1, 2016, the World Health Organization declared a Public Health Emergency of Inter- national concern （PHEIc） for ZIKV. Discovered more than half a century ago in Uganda,

关键词：神经发育病毒缺陷事业世界卫生组织健康问题公共卫生乌干达

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Identification of Orientia tsutsugamushi,spotted fever group and typhus group Rickettsia by duplex and nested PcR methods

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Asian Pacific journal of Tropical Medicine 2008年第4期1卷 1-8页

作者： M-c Luan D-Z Yu L tang L-j Zhang Department of Rickettsiology National Institute of Communicable Disease Control and PreventionChina CDC Department of Microorganism Dalian Center for Disease Control and Prevention Department of Microecology Dalian medical university Department of Rickettsiology National Institute of Communicable Disease Control and PreventionChina.CDC

Objective:To identify members of genera of rickettsia and *** ***:Rapid and duplex and nested PcR methods have been established by designing primers based on the conserved regions of heat shock protein GroEL gene.345 mouse viscera samples including liver,spleen and kidney,96 Xenopsylla cheopis and 32 chiggers collected from Hongta areas of Yuxi city,Yunnan province were tested by the new PcR ***:The result of the study showed that the new PcR methods could identify most members of genera -Rickettsia and Orientia simultaneously with 100%specificity and its sensitivity could test one copy per *** results of detection prevalence of rickettsioses in mouse,flea and mites DNA samples showed that the total rickettsia infection rate in mouse was 34.78%(120/345).The total infection rates in ***,O.t Karp and *** of mouse samples were 28.12%(97/345),19.71%(68/345) and O. 29%(1/345) ***-infection rates in *** and 0.t Karp of mouse samples were 13.33%(46/ 345).O.t Karp type has been the main epidemic strain in these ***:We concluded that this PcR method could be used to detect multi-genera rickettsia *** evidences provided in this and previous studies strongly support that Hongta areas of Yuxi city are a natural focus for typhus and scrub typhus with the common occurrence of their confection.

关键词： Rickettsia,GroEL gene Duplex and nested PcR

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MULTI-FAcILITY ORDERED MEDIAN PROBLEMS IN DIREcTED NETWORKS

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journal of Systems Science & complexity 2011年第1期24卷 61-67页

作者： Huajun tang T. c. Edwin cHENG c. T. NG Faculty of Management and Administration Macao University of Science and Technology Macao China Department of Logistics and Maritime Studies The Hong Kong Polytechnic University Hong Kong China

This paper uses a finite dominating set （FDS） to investigate the multi-facility ordered median problem （OMP） in a strongly connected directed network. The authors first prove that the multi-facility OMP has an FDS in the node set, which not only generalizes the FDS result provided by Kalcsics, et al. （2002）, but also extends the FDS result from the single-facility case to the multiple case, filling an important gap. Then, based on this FDS result, the authors develop an exact algorithm to solve the problem. However, if the number of facilities is large, it is not practical to find the optimal solution, because the multi-facility OMP in directed networks is NP-hard. Hence, we present a constant-approximation algorithm for the p-median problem in directed networks. Finally, we pose an open problem for future research.

关键词： Algorithms finite dominating sets multi-facility ordered median problem pseudoequilibria.

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Inflammasome links traumatic brain injury, chronic traumatic encephalopathy, and Alzheimer's disease

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Neural Regeneration Research 2025年第6期20卷 1644-1664页

作者： Gabriela Seplovich Yazan Bouchi juan Pablo de Rivero Vaccari jennifer c.Munoz Pareja Andrew Reisner Laura Blackwell Yehia Mechref Kevin K.Wang j.Adrian Tyndall Binu Tharakan Firas Kobeissy Department of Surgery Morehouse School of MedicineAtlantaGAUSA Department of Neurobiology Center for NeurotraumaMultiomics&Biomarkers(CNMB)Neuroscience InstituteMorehouse School of MedicineAtlantaGAUSA Department of Neurological Surgery and the Miami Project to cure Paralysis University of Miami Miller School of MedicineMiamiFLUSA Division of Pediatric critical care Department of PediatricsUniversity of Miami Miller School of MedicineMiamiFLUSA Department of Pediatrics Emory UniversityAtlantaGAUSA Department of Neurosurgery Children’s Healthcare of AtlantaAtlantaGAUSA Department of chemistry and Biochemistry Texas Tech UniversityLubbockTXUSA Morehouse School of Medicine AtlantaGAUSA

Traumatic brain injury, chronic traumatic encephalopathy, and Alzheimer's disease are three distinct neurological disorders that share common pathophysiological mechanisms involving neuroinflammation. One sequela of neuroinflammation includes the pathologic hyperphosphorylation of tau protein, an endogenous microtubule-associated protein that protects the integrity of neuronal cytoskeletons. Tau hyperphosphorylation results in protein misfolding and subsequent accumulation of tau tangles forming neurotoxic aggregates. These misfolded proteins are characteristic of traumatic brain injury, chronic traumatic encephalopathy, and Alzheimer's disease and can lead to downstream neuroinflammatory processes, including assembly and activation of the inflammasome complex. Inflammasomes refer to a family of multimeric protein units that, upon activation, release a cascade of signaling molecules resulting in caspase-induced cell death and inflammation mediated by the release of interleukin-1β cytokine. One specific inflammasome, the NOD-like receptor protein 3, has been proposed to be a key regulator of tau phosphorylation where it has been shown that prolonged NOD-like receptor protein 3 activation acts as a causal factor in pathological tau accumulation and spreading. This review begins by describing the epidemiology and pathophysiology of traumatic brain injury, chronic traumatic encephalopathy, and Alzheimer's disease. Next, we highlight neuroinflammation as an overriding theme and discuss the role of the NOD-like receptor protein 3 inflammasome in the formation of tau deposits and how such tauopathic entities spread throughout the brain. We then propose a novel framework linking traumatic brain injury, chronic traumatic encephalopathy, and Alzheimer's disease as inflammasomedependent pathologies that exist along a temporal continuum. Finally, we discuss potential therapeutic targets that may intercept this pathway and ultimately minimize long-term neurological decline.

关键词： Alzheimer's disease caspase-1 chronic traumatic encephalopathy inflammasomes neurodegeneration neuroinflammation NLRP1 NLRP3 pyroptosis tauopathy traumatic brain injury

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A novel method for analyzing dominant oscillation mode based on improved EMD and signal energy algorithm

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Science china(Technological Sciences) 2011年第9期54卷 2493-2500页

作者： YANG Dechang REHTANZ c LI Yong tang Wei Institute of Power Systems and Power Economics TU-Dortmund 44227 Dortmund Germany college of lnforrnation and Electrical Engineering China Agricultural University Beijing 100083 China

In this paper, a novel method that integrates the improved empirical mode decomposition （EMD） and signal energy algorithm is proposed to estimate the dominant oscillation parameters and corresponding mode shape. Firstly, the EMD with symmetrical extrema extension （SEE） is utilized to decompose the measured data from wide area measurement system （WAMS） into a finite set of intrinsic mode functions （1MFs）. Then, the signal energy algorithm is used to calculate the approximate oscillation parameters of the IMFs. The nodes involved the dominant oscillation mode are classified based on the calculated frequency and reasonable threshold. Furthermore, for the dominant oscillation mode, the IMF with maximum mean amplitude is defined as the reference. Next, the relative phases （RPs） between the reference IMF and other 1MFs are calculated in order to identify the negative and positive oscillation groups. According to the values of RPs, the coherent group and corresponding node contribution factor （NcF） can be identified, and the dominant approximate mode shape （AMS） can also be determined. The efficiency of the proposed approach is tested by applying it to synthetic signal and measured data from the simulation model.

关键词： low frequency oscillation wide area measurement system symmetrical extrema extension signal energy algorithm, total oscillation energy, node oscillation energy, node contribution factor

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数字经济驱动扬州先进制造业与现代服务业融合的路径研究

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江苏商论 2025年第1期 66-69页

作者：唐建扬州职业大学管理学院江苏扬州225100

在先进制造业与现代服务业融合的过程中,数字经济贯穿其中。文章阐述了数字经济对“两业”融合的作用,并在目前扬州“两业”融合基础之上,总结了扬州“两业”融合中的问题,提出了数字经济促进扬州“两业”融合的路径。

关键词：数字经济先进制造业现代服务业产业融合

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3-D FINITE ELEMENT ANALYSIS OF THE EFFEcT OF WELDING RESIDUAL STRESS ON HYDROGEN DIFFUSION IN HYDROGEN cONTAINED ENVIRONMENT

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Acta Metallurgica Sinica(English Letters) 2007年第5期20卷 347-354页

作者： W.c. jiang j.M. Gong j.Q. tang H. chen S.T. Tu college of Mechanical and Power Engineering Nanjing University of Technology Nanjing 210009 China

The hydrogen distribution of 16MnR steel weldment in hydrogen contained environment was calculated using the finite element method （ FEM）. The effect of welding residual stress on hydrogen diffusion has been discussed using a 3-D sequential coupling finite element analysis procedure complied by Abaqus code. The hydrogen diffusion coefficient in weld metal, the heat affected zone （HAZ）, and the base metal of the 16MnR steel weldment were measured using the electrochemical permeation technique. The hydrogen diffusion without the effect of stress was also calculated and compared. Owing to the existence of welding residual stress, the hydrogen concentration was obviously increased and the hydrogen wouM diffuse and accumulate in the higher stress region.

关键词： 16MnR steel hydrogen diffusion welding residual stress finite element analysis

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AcTPred: Activity Prediction in Mobile Social Networks

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Tsinghua Science and Technology 2014年第3期19卷 265-274页

作者： jibing Gong jie tang A.c.M. Fong School of Information Science and Engineering Yanshan University Department of computer Science and Technology Tsinghua University University of Glasgow in Singapore

A current trend for online social networks is to turn *** social networks directly reflect our real social life,and therefore are an important source to analyze and understand the underlying dynamics of human behaviors （activities）.In this paper,we study the problem of activity prediction in mobile social *** present a series of observations in two real mobile social networks and then propose a method,AcTPred,based on a dynamic factor-graph model for modeling and predicting users＇ *** approximate algorithm based on mean fields is presented to efficiently learn the proposed *** deploy a real system to collect users＇ mobility behaviors and validate the proposed method on two collected mobile *** results show that the proposed AcTPred model can achieve better performance than baseline methods.

关键词： social prediction activity prediction user modeling social networks

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