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Synchronous improvement of mechanical properties and stress corrosion resistance by stress-aging coupled with natural aging pre-treatment in an Al-Zn-Mg alloy with high recrystallization fraction

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journal of Materials Science & Technology 2022年第26期121卷 40-51页

作者： D.Zhang H.C.jiang Z.j.cui D.S.Yan Y.Y.Song L.j.Rong CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Shandong Key Laboratory of Advanced Aluminum Materials and Technology Binzhou 256606China

Enhancing the strength of Al-Zn-Mg alloys is critical to the weight-lightening of structural components in the application of high-speed trains and aerospace industries,while high stress corrosion cracking(SCC)susceptibility of Al-Zn-Mg alloys(especially the alloy with high recrystallization fraction)with high strength makes it *** this study,the influence of tensile stress-aging coupled with natural aging pre-treatment on the mechanical properties and SCC resistance of Al-Zn-Mg alloy with high recrystallization fraction has been *** results show that tensile stress-aging at 160℃can inhibit the dissolution of clusters/Guinier-Preston(GP)zones formed during long-term natural aging pre-treatment,which increases the number density of matrix precipitates(MPts),narrow the width of precipitate free zone(PFZ),and dramatically improve the mechanical properties of the experimental Al-Zn-Mg ***,the precipitation of the high density of MPts within the matrix will assume a large number of solute atoms during artificial aging,which will reduce the supplement of solute atoms to grain *** a result,the volume of anodic active grain boundary precipitates(GBPs)and the content of free solute atoms at grain boundaries are reduced,which reduces the possibility of initial nucleation and propagation of SCC *** coupled treatment method proposed in this study proves efficient in resolving the contradiction between the strength and SCC resistance in Al-Zn-Mg alloy.

关键词： Al-Zn-Mg alloy Natural aging Stress-aging Precipitates Stress corrosion cracking

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Influence of Solid Fraction on Gravity Segregation of Sn in A1-20Sn Alloy Casting

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journal of Materials Science & Technology 2000年第6期16卷 577-580页

作者： Zhang P. Du Y.H. Zeng D.B. cui j.Z. Ba L.M. Dep. of Mechanical Eng. Tsinghua Univ. Beijing 100084 China

The influence of solid fraction of Al-20Sn alloy mushy on gravity segregation of Sn in casting was studied . The relationship between solid fraction and the temperature of alloy mushy and that between solid fraction of alloy mushy and size of Sn particle in ingot were determined. The results show that the relationship between solid fraction and the temperature of alloy mushy was fs=1683-4.86t+0.003 5t2. The extent of gravity segregation of Sn in casting reduced gradually with the increase of solid fraction of alloy mushy. When solid fraction of alloy mushy was larger than 40%, the gravity segregation of Sn in casting could be removed basically, and the relationship between solid fraction of alloy mushy and size of Sn particle in ingot was s=-0.64fs+70.8.

关键词： Metal casting

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Modified constitutive models for Inconel 718 considering current density and temperature in electrically assisted forming process

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Chinese journal of Aeronautics 2024年第2期37卷 524-540页

作者： Xuan cui Rui ZHAO Min WAN School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China jiangxi Research Institute of Beihang University Jiangxi 330000China

Electrically Assisted Forming(EAF)technology has obvious advantages in material *** develop an effective constitutive model considering electrical effects,room temperature and electrically assisted quasi-static uniaxial tensile tests were conducted using ultrathin nickelbased superalloy plates with a thickness of 0.25 *** research focused on the two most widely recognized effects:the joule thermal and the electric athermal *** mechanism of current action can be divided into two scenarios:one considering the joule thermal effect only,and the other considering both effects *** basic constitutive models,namely the Modified-Hollomon model and the johnson-Cook(j-C)model,were selected to be optimized through the classification of two different situations,and four optimized constitutive models were *** was found that the j-C model with simultaneous consideration of the joule thermal effect and electric athermal effect had the best prediction effect by comparing the results of these four ***,the accuracy of the optimization model was verified by finite element simulation of the electrically assisted stretching optimization *** results show that the constitutive model can effectively predict the temperature effect caused by the joule heat effect and the athermal effect of current on the material.

关键词： joule heating Elastoplasticity Plastic deformation Superalloys Constitutive models

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Amplitude analysis of the decays D^(0)→π^(+)π^(−)π^(+)π^(−)and D^(0)→π^(+)π^(−)π^(0)π^(0)

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Chinese Physics C 2024年第8期48卷 6-33页

作者： M.Ablikim M.N.Achasov P.Adlarson O.Afedulidis X.C.Ai R.Aliberti A.Amoroso Q.An Y.Bai O.Bakina I.Balossino Y.Ban H.-R.Bao V.Batozskaya K.Begzsuren N.Berger M.Berlowski M.Bertani D.Bettoni F.Bianchi E.Bianco A.Bortone I.Boyko R.A.Briere A.Brueggemann H.Cai X.Cai A.Calcaterra G.F.Cao N.Cao S.A.Cetin j.F.Chang W.L.Chang G.R.Che G.Chelkov C.Chen C.H.Chen Chao Chen G.Chen H.S.Chen M.L.Chen S.j.Chen S.L.Chen S.M.Chen T.Chen X.R.Chen X.T.Chen Y.B.Chen Y.Q.Chen Z.j.Chen Z.Y.Chen S.K.Choi X.Chu G.Cibinetto F.Cossio j.j.cui H.L.Dai j.P.Dai A.Dbeyssi R.E.de Boer D.Dedovich C.Q.Deng Z.Y.Deng A.Denig I.Denysenko M.Destefanis F.De Mori B.Fang S.S.Fang W.X.Fang Y.Fang Y.Q.Fang R.Farinelli L.Fava F.Feldbauer G.Felici C.Q.Feng j.H.Feng Y.T.Feng K.Fischer M.Fritsch C.D.Fu j.L.Fu Y.W.Fu H.Gao Y.N.Gao Yang Gao S.Garbolino I.Garzia P.T.Ge Z.W.Ge C.Geng E.M.Gersabeck B.Ding X.X.Ding Y.Ding Y.Ding j.Dong L.Y.Dong M.Y.Dong X.Dong M.C.Du S.X.Du Z.H.Duan P.Egorov Y.H.Fan j.Fang jA.Gilman K.Goetzen L.Gong W.X.Gong W.Gradl S.Gramigna M.Greco M.H.Gu Y.T.Gu C.Y.Guan Z.L.Guan A.Q.Guo L.B.Guo M.j.Guo R.P.Guo Y.P.Guo A.Guskov j.Gutierrez K.L.Han T.T.Han X.Q.Hao F.A.Harris K.K.He K.L.He F.H.Heinsius C.H.Heinz Y.K.Heng C.Herold T.Holtmann P.C.Hong G.Y.Hou X.T.Hou Y.R.Hou Z.L.Hou B.Y.Hu H.M.Hu j.F.Hu T.Hu Y.Hu G.S.Huang K.X.Huang L.Q.Huang X.T.Huang Y.P.Huang T.Hussain F.H\"olzken N.H\"usken N.in der Wiesche M.Irshad j.jackson S.janchiv j.H.jeong Q.ji Q.P.ji W.ji X.B.ji X.L.ji Y.Y.ji X.Q.jia Z.K.jia D.jiang H.B.jiang P.C.jiang S.S.jiang T.j.jiang X.S.jiang Y.jiang j.B.jiao j.K.jiao Z.jiao S.jin Y.jin M.Q.jing X.M.jing T.johansson S.Kabana N.Kalantar-Nayestanaki X.L.Kang X.S.Kang M.Kavatsyuk B.C.Ke V.Khachatryan A.Khoukaz R.Kiuchi O.B.Kolcu B.Kopf M.Kuessner X.Kui A.Kupsc W.K\"uhn j.j.Lane P.Larin L.Lavezzi T.T.Lei Z.H.Lei H.Leithoff M.Lellmann T.Lenz C.Li C.Li C.H.Li Cheng Li D.M.Li F.Li G.Li H.Li H.B.Li H.j.Li H.N.Li Hui Li j.R.Li j.S.Li K.Li L.j.Li L.K.Li Lei Li M.H.Li P.R.Li Q.M.Li Q.X.Li R.Li S.X.Li T.Li W.D.Li W.G.Li X.Li X.H.Li X.L.Li X.Y.Li Y Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Beihang University Beijing 100191China Bochum Ruhr-University D-44780 BochumGermany Budker Institute of Nuclear Physics SB RAS(BINP) Novosibirsk 630090Russia Carnegie Mellon University PittsburghPennsylvania 15213USA Central China Normal University Wuhan 430079China Central South University Changsha 410083China China Center of Advanced Science and Technology Beijing 100190China China University of Geosciences Wuhan 430074China Chung-Ang University Seoul06974Republic of Korea COMSATS University Islamabad Lahore CampusDefence RoadOff Raiwind Road54000 LahorePakistan Fudan University Shanghai 200433China GSI Helmholtzcentre for Heavy Ion Research GmbH D-64291 DarmstadtGermany Guangxi Normal University Guilin 541004China Guangxi University Nanning 530004China Hangzhou Normal University Hangzhou 310036China Hebei University Baoding 071002China Helmholtz Institute Mainz Staudinger Weg 18D-55099 MainzGermany Henan Normal University Xinxiang 453007China Henan University Kaifeng 475004China Henan University of Science and Technology Luoyang 471003China Henan University of Technology Zhengzhou 450001China Huangshan College Huangshan 245000China Hunan Normal University Changsha 410081China Hunan University Changsha 410082China Indian Institute of Technology Madras Chennai 600036India Indiana University BloomingtonIndiana 47405USA INFN Laboratori Nazionali di Frascati INFN Laboratori Nazionali di FrascatiI-00044FrascatiItaly INFN Laboratori Nazionali di Frascati INFN Sezione di PerugiaI-06100PerugiaItaly INFN Laboratori Nazionali di Frascati University of PerugiaI-06100PerugiaItaly INFN Sezione di Ferrara INFN Sezione di FerraraI-44122FerraraItaly INFN Sezione di Ferrara University of FerraraI-44122FerraraItaly Inner Mongolia University Hohhot 010021China Institute of Modern Physics Lanzhou 730000China Institute of Physics and Technology Peace Avenue 54BUlaanbaatar 13330Mongolia Instituto de A

Using e^(+)e^(−)annihilation data corresponding to an integrated luminosity of 2.93 fb^(−1)taken at the center-of-mass energy√s=3.773 GeV with the BESIII detector,a joint amplitude analysis is performed on the decays D^(0)→π^(+)π^(−)π^(+)π^(−)and D^(0)→π^(+)π^(−)π^(0)π^(0)(non-η).The fit fractions of individual components are obtained,and large interferences among the dominant components of the decays D^(0)→a_(1)(1260)π,D^(0)→π(1300)π,D^(0)→ρ(770)ρ(770),and D^(0)→2(ππ)_(S)are observed in both *** the obtained amplitude model,the CP-even fractions of D^(0)→π^(+)π^(−)π^(+)π^(−)and D^(0)→π^(+)π^(−)π^(0)π^(0)(non-η)are determined to be(75.2±1.1_(stat).±1.5_(syst.))%and(68.9±1.5_(stat).±2.4_(syst.))%,*** branching fractions of D^(0)→π^(+)π^(−)π^(+)π^(−)and D^(0)→π^(+)π^(−)π^(0)π^(0)(non-η)are measured to be(0.688±0.010_(stat.)±0.010_(syst.))%and(0.951±0.025_(stat.)±0.021_(syst.))%,*** amplitude analysis provides an important model for the binning strategy in measuring the strong phase parameters of D^(0)→4πwhen used to determine the CKM angleγ(ϕ_(3))via the B^(−)→DK^(−)decay.

关键词： BESIII D^(0)meson decays amplitude analysis CP-even fraction

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Survey on Fake Information Generation,Dissemination and Detection

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Chinese journal of Electronics 2024年第3期33卷 573-583页

作者： Wanqiu cui Dawei WANG Na HAN School of National Security People's Public Security University of China Big Data Center of The Ministry of Public Security

The current booming development of the Internet has put the public in an era of information overload,in which false information is mixed and spread *** phenomenon has seriously disturbed the social network ***,a substantial amount of research is beginning to be devoted to the effective management of fake *** analyze the abnormal characteristics of fake information from its mechanism of generation and *** view of different exceptional features,we systematically sort out and evaluate the existing studies on false content *** commonly used public datasets,metrics,and performance are categorized and compared,hoping to provide a basis and guidance for related *** study found that the current active social platforms show different *** future direction should point to mining platform features of multi-domain sources,multi-data forms,and multi-language heterogeneity to provide more valuable clues for fake information.

关键词： Fake information Abnormal characteristics Detection methods Public datasets

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艾灸或针刺膈俞穴对环磷酰胺致白细胞减少大鼠诱生粒细胞-巨噬细胞集落刺激因子的作用

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中国组织工程研究与临床康复 2007年第28期11卷 5473-5476页

作者：崔瑾严洁贵阳中医学院针灸推拿系贵州省贵阳市550001 湖南中医药大学针灸推拿学院湖南省长沙市410007

目的:对比观察艾灸或针刺膈俞穴以及常规西药治疗对环磷酰胺所致骨髓造血抑制大鼠巨噬细胞诱生粒细胞-巨噬细胞集落刺激因子的能力。方法:实验于2004-06/2005-12在贵阳中医学院完成。①实验材料:选取普通级Wistar大鼠60只,白细胞值(3.0... 详细信息

目的:对比观察艾灸或针刺膈俞穴以及常规西药治疗对环磷酰胺所致骨髓造血抑制大鼠巨噬细胞诱生粒细胞-巨噬细胞集落刺激因子的能力。方法:实验于2004-06/2005-12在贵阳中医学院完成。①实验材料:选取普通级Wistar大鼠60只,白细胞值(3.0～15.0)×109L-1,随机数字表法分为6组:空白组、模型组、西药组、针刺组、艾灸组、非穴位组,10只/组。②实验方法:除空白组外,其余5组均建立白细胞减少症低免疫力动物模型,以环磷酰胺40mg/kg腹腔注射,1次/d,连续5d,白细胞数值较长时间维持在1.50～2.95×109L-1水平为造模成功。西药组大鼠按每100g体质量给予2.1g/L利血生水溶液1mL灌胃,自造模结束后第1天起,1次/d,连续11d。针刺组将大鼠选取“膈俞”穴(在第7胸椎棘突下两旁肋间),用直径0.22mm、长13mm的毫针刺入约3mm,然后接电子针疗仪,电流强度以使局部肌肉抽动为度,留针连续刺激15min,自造模结束后第1天起,1次/d,连续11d。艾灸组于“膈俞”穴上涂医用凡士林少许,制小艾炷(稍大于绿豆,重量约15mg),直接放在“膈俞”穴上,用线香点燃,待艾炷燃至大鼠挣扎时用镊子夹去,每穴3壮,自造模结束后第1天起,1次/d,连续11次。非穴位组同法固定大鼠,针刺尾部任一非穴位点,自造模结束后第1天起,1次/d,连续11次。模型组造膜后仅抓取固定,但不治疗。空白组不经过任何处理。③实验评估:治疗第1,3,5,7,9,11天检测各组外周血白细胞数量。治疗第11天检测各组脾质量及脾脏指数,I放射免疫试剂盒125测定血清粒细胞-巨噬细胞集落刺激因子含量。结果:①治疗后各组大鼠外周血白细胞数值的变化:与模型组比较,治疗第5天西药组、针刺组、艾灸组白细胞数量均明显回升(P0.05),第11天针刺组、西药组外周血白细胞数量与空白组基本相似(P>0.05)。②治疗后各组大鼠脾质量及脾脏指数的比较:与模型组比较,治疗第11天西药组、针刺组、艾灸组脾质量及脾脏指数均明显增加(P0.05);针刺组、西药组仍未达正常水平(P0.05);且艾灸组升高作用强于针刺组和西药组(P<0.05)。结论:针刺或艾灸膈俞穴以及常规西药治疗均能回升外周血白细胞数量,增强化疗大鼠巨噬细胞诱生粒细胞-巨噬细胞集落刺激因子的能力,尤以艾灸膈俞穴效果为佳。

关键词：膈俞穴环磷酰胺白细胞减少症粒细胞-巨噬细胞集落刺激因子

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Endoscopic full-thickness resection of gastric stromal tumor arising from the muscularis propria

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Chinese Medical journal 2013年第13期126卷 2435-2439页

作者： Zhang B Huang LY Wu CR cui j jiang LX Zheng HT Department of GastroenterologyYantai Yuhuangding Hospital affiliated to Medical College of Qingdao University Yantai Shandong 264000 China Department of Abdominal SurgeryYantai Yuhuangding Hospital affiliated to Medical College of Qingdao University Yantai Shandong 264000 China

Background Gastric stromal tumors are the most common type of tumor originating from mesenchymal tissue. The traditional method for the treatment of gastric stromal tumor is surgical operation or therapeutic laparoscopy. More recently, endoscopic micro-traumatic surgery has become possible for gastric stromal tumors, with any perforation caused by endoscopic therapy mended endoscopically. We assessed the effectiveness of endoscopic full-thickness resection （EFR） in the treatment of gastric stromal tumors arising from the muscularis propria. Methods Of the 42 gastric stromal tumors, each 〉2.0 cm in diameter, arising from the muscularis propria, 22 were removed by EFR and 20 by laparoscopic surgery. Tumor expression of CD34, CDl17, Dog-l, S-100, and smooth muscle actin （SMA） was assessed immunohistochemically. Operating time, complete resection rate, length of hospital stay, incidence of complications, and recurrence rates were compared between the two groups. Continuous data were compared by using independent samples t-tests and categorical data by using Xz tests. Results Comparisons of the 22 gastric stromal tumors treated with EFR and the 20 treated with laparoscopic surgery showed similar operation times （60-155 minutes （mean, （90±17） minutes） vs. 50-210 minutes （mean, （95±21） minutes）, P 〉0.05）, complete resection rates （100% vs. 95%, P 〉0.05）, and length of hospital stay （4-10 days （mean, （6.0±1.8） days） vs. 4-12 days （mean, （7.3±1.7） days）, P 〉0.05）. None of the patients treated with EFR experienced complications, whereas one patient treated with laparoscopy required a conversion to laparotomy and one experienced postoperative gastroparesis. No recurrences were observed in either group. stromal tumors diagnosed by gastroscopy and endoscopic remaining 36 were stromal tumors. mmunohistochemical staining showed that of the 42 gastric ultrasound, six were leiomyomas （SMA-positive） and the Conclusions Gastric stromal tumors arising from the muscularis propria can be

关键词： gastrointestinal stromal tumor " treatment " endoscopy " muscularis propria " resection

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Core shift limitation in investment casting process of hollow turbine blade

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Chinese journal of Aeronautics 2024年第8期37卷 513-526页

作者： Kang cui Lin jING Ruisong jIANG Longnv YU Xiao GAO Automation and Software Engineering Shanxi UniversityTaiyuan 030006China Key Laboratory of High Performance Manufacturing for Aero Engine Ministry of Industry and Information TechnologySchool of Mechanical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China School of Mechanical Engineering Sichuan UniversityChengdu 610065China

The deviation in wall thickness caused by core shift during the investment casting process significantly impacts the strength and service life of hollow turbine *** address this issue,a core shift limitation method is developed in this ***,a shift model is established based on computational fluid dynamics and motion simulation to predict the movement of the ceramic core in investment casting ***,utilizing this model,an optimization method for fixturing layout inside the refractory ceramic shell is devised for the ceramic *** casting experiment demonstrates that by utilizing the optimized fixture layout,not only can core shift during the investment casting pouring process be effectively controlled,but also the maximum wall thickness error of the blade can be reduced by 42.02%.In addition,the core shift prediction is also validated,with a prediction error of less than 26.9%.

关键词： Hollow turbine blade Wall thickness Ceramic core Shift prediction Fixturing layout optimization

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Effects of mineralogy on thermo-hydro-mechanical parameters of MX80 bentonite

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journal of Rock Mechanics and Geotechnical Engineering 2010年第1期2卷 91-96页

作者： A. M. Tang Y. j. cui UR Navier/CERMES Ecole des Ponts ParisTech Paris 77455 France

Thermal conductivity, water retention curve and swelling behavior of two MX80 bentonite samples were studied in the present work. The difference obtained from these two MX80 bentonite samples was then analyzed in terms of mineralogical effects （effects of the proportion of quartz and montmorillonite）. It was concluded that the mineralogical effect was significant on the thermal conductivity and the swelling capacity; on the contrary, it was negligible on the water retention property.

关键词： compacted bentonite thermal conductivity water retention property swelling potential mineralogical effects

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利用现场测试的加速度和速度数据确定位移的积分方法评价（英文）

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journal of Zhejiang University-Science A(Applied Physics & Engineering) 2017年第7期18卷 553-566页

作者： F.LAMAS-LOPEZ Y.j.cui S. COSTA D'AGUIAR N. CALON Ecole des Ponts ParisTech Laboratoire Navier/CERMES Marne-la-Vallee France SNCF Direction Projet Systemes & Ingenierie Departement Ligne Voie et Environnement La Plaine Saint-Denis France SNCF Direction Innovation & Recherche Paris France

目的:本文旨在研究不同波长载荷(包括车厢长度、构架长度以及轴距等)对位移确定的影响,利用积分方法确定位移的有效性和重复性的适用范围,以及研究列车速度和轴荷载对变形量的影响,为轨道基础位移监测提供重要的方法。创新点:1.评价和... 详细信息

目的:本文旨在研究不同波长载荷(包括车厢长度、构架长度以及轴距等)对位移确定的影响,利用积分方法确定位移的有效性和重复性的适用范围,以及研究列车速度和轴荷载对变形量的影响,为轨道基础位移监测提供重要的方法。创新点:1.评价和分析一种积分方法,该方法利用低通滤波法但不消除产生变形的主要频率;2.通过对位移、速度和加速度传感器在时域和频域结果的比较,使重复性得到保证。方法:利用线性可变差位移传感器、地震检波器以及加速度计获取轨道不同深度的位移、速度和加速度,然后利用巴特沃兹低通滤波器对3类数据进行滤波。通过对速度一阶积分、加速度二阶积分,获得由3种传感器测试得到的位移并验证其准确性。结论:通过测试和分析发现,95%的位移幅值来自于波长大于轴距(2.8 m)的激励,对应的低频为25 Hz(列车运行速度为200 km/h)。通过线性可变差位移传感器、地震检波器以及加速度计直接获得或间接积分获得的位移十分接近,验证了积分方法的有效性,且其具有较高的可重复性。

关键词：铁路轨道振动加速度计地震检波器线性可变差位移传感器积分方法变形量估计测试重复性

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