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Effect of drawing speed on microstructure distribution and drawability in twinning-induced plasticity steel during wire drawing

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Journal of Iron and Steel Research International 2020年第5期27卷 577-587页

作者： Joong-ki Hwang School of mechanical Engineering Tongmyong UniversityBusan 48520Republic of Korea

The effect of drawing speed on temperature rise and microstructure distribution in twinning-induced plasticity(TWIP)steel during wire drawing has been investigated to improve drawability for wire rod *** wire drawing process is performed at room temperature,heat is generated due to the plastic deformation and friction at the wire-die *** steel wires subjected to the low drawing speed(LD)of 0.5 m/min and the high drawing speed(HD)of 5.0 m/min were analyzed using the numerical simulation and electron backscatter diffraction ***,the specimens subjected to the HD had a higher drawability by about 18%compared to the LD,which is totally different from the general behavior of plain carbon pearlitic *** LD wire had uniform temperature distribution along the radial direction during wire *** contrast,the HD wire had a temperature gradient along the radial direction due to the higher frictional effect at surface:the minimum temperature of 58℃ at center area and the maximum temperature of 143 C at surface *** higher stacking fault energy of HD wire at the surface area due to the high temperature rise retarded twinning rate,resulting in the prevention of fast exhaustion in ductility in comparison with the LD wires since the earlier depletion of twins at surface area is known as the main reason for the fracture of TWIP steel during wire ***,HD process delayed the fracture strain of wire and increased the uniformity of microstructure and mechanical properties along the radial direction.

关键词： Twinning-induced plasticity steel Wire drawing Deformation twin Drawing speed Temperature rise

Effect of polyethylene glycol on electrochemically deposited trivalent chromium layers

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中国有色金属学会会刊：英文版 2009年第4期19卷 819-823页

作者： Joo-Yul LEE man ki m Sik-Chol KWON Department of Surface Technology Korea Institute of Materials Science

The structural characteristics of the trivalent chromium deposits and their interfacial behavior in the plating solution with and without polyethylene glycol molecules were observed by using various electrochemical methods such as cyclic voltammetry,open circuit potential transition,electrochemical impedance spectroscopy,scanning electron microscopy and X-ray photoelectron *** is shown that the polyethylene glycol molecules make the reductive current density lower in the trivalent chromium plating system and promote a hydrogen evolution reaction through their adsorption on the electrode *** the trivalent chromium layer formed from the polyethylene glycol-containing solution has somewhat higher density of cracks on its surface and results in a lower film resistance,lower polarization resistance,and higher capacitance in a corrosive *** is also revealed that the formation of chromium carbide layer is facilitated in the presence of polyethylene glycol,which means easier electrochemical codeposition of chromium and carbon,not single chromium deposition.

关键词：聚乙二醇电沉积层三价铬扫描电子显微镜电化学阻抗谱电极表面电化学方法乙二醇溶液

Neurocircuit regeneration by extracellular matrix reprogramming

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Neural Regeneration Research 2025年第8期20卷 2300-2301页

作者： Shengzhang Su Ian N.Levasseur kimberly m.Alonge Department of medicinal Chemistry University of WashingtonSeattleWAUSA Department of Chemistry University of WashingtonSeattleWAUSA Department of medicine University of Washington Medicine Diabetes InstituteSeattleWAUSA

The brain's extracellular matrix(ECm),which is comprised of protein and glycosaminoglycan(GAG)scaffolds,constitutes 20%-40% of the human brain and is considered one of the largest influencers on brain cell functioning(Soles et al.,2023).Synthesized by neural and glial cells,the brain's ECm regulates a myriad of homeostatic cellular processes,including neuronal plasticity and firing(miyata et al.,2012),cation buffering(moraws ki et al.,2015),and glia-neuron interactions(Anderson et al.,2016).Considering the diversity of functions,dynamic remodeling of the brain's ECm indicates that this understudied medium is an active participant in both normal physiology and neurological diseases.

关键词： matrix programming

Density functional theory study on the role of ternary alloying elements in TiFe-based hydrogen storage alloys

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Journal of materials Science & Technology 2021年第33期92卷 148-158页

作者： Won-Seok Ko ki Beom Park Hyung-ki Park School of materials Science and Engineering University of UlsanUlsan 44610Republic of Korea Functional materials and Components R&D Group Korea Institute of Industrial TechnologyGangneung 25440Republic of Korea

The role of additional ternary alloying elements on the performance of stationary TiFe-based hydrogen storage alloys was investigated based on first-principles density functional theory *** a basic step for examinations,the site preference of each alloying element in the stoichiometric and nonstoichiometric B2TiFe compounds was clarified considering possible antisite *** on the revealed site preference,the effect of various possible ternary elements on the hydrogen storage was examined by focusing on the formation enthalpies of TiFeH and TiFeH_(2) hydrides,which were closely related to the change in the location of plateaus in the pressure-composition-temperature *** physical properties such as the volume expansion due to hydride formation were also examined to provide additional criteria for selecting optimum alloying conditions in future alloying design *** alloying elements that maximize the grain boundary embrittlement due to the solute segregation were proposed for the enhanced initial activation of TiFe-based hydrogen storage alloys.

关键词： Hydrogen storage alloy Titanium-iron Density functional theory calculation metallic hydride

峨眉山玄武岩作为长江上游特征源岩对三峡贯通的指示

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地球科学（中国地质大学学报） 2014年第4期39卷 431-442页

作者：杨建李长安 N'dji dit Jacques Dembele 江华军中国地质大学地球科学学院湖北武汉430074 中国地质大学生物地质与环境地质国家重点实验室湖北武汉430074

峨眉山玄武岩作为长江上游攀西地区广泛分布的岩类，具有形成环境独特、出露面积大、岩石易鉴定的特点，可作为长江三峡贯通物源示踪研究的指示标志．通过对长江中上游阶地和江汉平原周老孔第四纪岩心沉积物中的玄武岩砾石和岩屑（1～2m... 详细信息

峨眉山玄武岩作为长江上游攀西地区广泛分布的岩类，具有形成环境独特、出露面积大、岩石易鉴定的特点，可作为长江三峡贯通物源示踪研究的指示标志．通过对长江中上游阶地和江汉平原周老孔第四纪岩心沉积物中的玄武岩砾石和岩屑（1～2mm）进行研究发现，峨眉山玄武岩砾石在长江上游很常见，在三峡以下很少；玄武岩岩屑在长江上游沉积物中非常普遍，而且在周老孔岩心沉积物中的很多层位都有出现．对玄武岩岩屑基质中的斜长石做了微量元素微区原位分析（LA_ICP_mS），分析表明，在周老孔中含峨眉山玄武岩岩屑的岩心层位最大深度为156m，该层位古地磁年龄约为1．7ma，此时长江已经形成目．三峡已经贯通．

关键词：峨眉山玄武岩江汉平原第四纪沉积物微量元素物源示踪长江演化

New means to monitor the effect of glucocorticoid therapy in children

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World Journal of Gastroenterology 2010年第9期16卷 1104-1109页

作者： Hanne Rintamki Harri m Salo Outi Vaarala Kaija-Leena Kolho Division of Gastroenterology Hospital for Children and AdolescentsUniversity of Helsinki Immune Response Unit Department of Vaccination and Immune ProtectionNational Institute for Health and Welfare

AIm:To study the individual effects of glucocorticoid (GC) therapy on the state ofimmune activation in patient ***:We developed a novel assay in which the effect of corticosteroid-treated patient serum on healthy donor peripheral blood mononuclear cells (target cells) was studied,with a panel of markers for effector [interferon (IFN)γ and interleukin (IL)-5] and regulatory T cells (FOXP3 and glucocorticoid-induced tumor necrosis factor receptor,GITR).The study group comprised 19 children with inflammatory bowel *** individual effect of patient serum on target cells was analyzed prior to GC therapy and 2 wk ***:The effect of GC therapy mediated by patient serum was seen as a decrease in the target cells expression of regulatory T-cell-related markers GITR (median suppression 24%,range of suppression 1%-63%,in 2 cases increase of 6% and 77%,P mitogen-activated target cells) and FOXP3 (median suppression 33%,range of suppression 0%-79%,in one case an increase of 173%,P m a mean of 87 700 pg/mL (SD 33 900 pg/mL) to 60 900 pg/mL (SD 44 200 pg/mL) in mitogen-activated target cells,13 of the cases showed a decrease,P minduced changes in the target cell ***:GC response could be monitored at an individual level by studying the effect of patient serum on signaling pathways of target immune cells.

关键词： Glucocorticoid-induced tumor necrosis factor receptor FOXP3 Inflammatory bowel disease Children

Th17 cells and their associated cytokines in liver diseases

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Cellular & molecular Immunology 2010年第4期7卷 250-254页

作者： Fouad Lafdil Andrew m miller Sung Hwan ki Bin Gao Section on Liver Biology Laboratory of Physiologic StudiesNational Institute on Alcohol Abuse and AlcoholismNational Institutes of HealthBethesdaMDUSA INSERm U955Cre´teilFrance Faculte´de me´decine Universite´Paris 12Cre´teilFrance

T helper 17(Th17)cells are a newly identified subset of T helper cells that play important roles in host defense against extracellular bacteria as well as in the pathogenesis of autoimmune *** functions of Th17 cells are mediated via the production of several cytokines including interleukin(IL)-17 and *** studies show that the frequency of IL-171 cells is significantly elevated in a variety of chronic liver diseases including alcoholic liver disease,viral hepatitis and hepatocellular ***-17 receptor is expressed virtually on all types of liver cells,while IL-22 receptor expression is restricted to epithelial cells including hepatocytes in the ***-17 seems to play an important role in inducing liver inflammation via stimulating multiple types of liver nonparenchymal cells to produce proinflammatory cytokines and chemokines,while IL-22 appears to be an important factor in promoting hepatocyte survival and proliferation.

关键词： IL-17 IL-22 hepatitis alcoholic liver disease liver cancer

DC motor Speed Regulator via Active Damping Injection and Angular Acceleration Estimation Techniques

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IEEE/CAA Journal of Automatica Sinica 2021年第3期8卷 641-647页

作者： Seok-Kyoon kim Choon ki Ahn Department of Creative Convergence Engineering Hanbat National UniversityDaejeon 341-58Republic of Korea School of Electrical Engineering Korea UniversitySeoul 136-701Republic of Korea

This paper suggests a novel model-based nonlinear DC motor speed regulator without the use of a current *** current dynamics,machine parameters and mismatched load variations are *** proposed controller is designed to include an active damping term that regulates the motor speed in accordance with the first-order low-pass filter dynamics through the pole-zero ***,the angular acceleration and its reference are obtained from simple first-order estimators using only the speed *** effectiveness is experimentally verified using hardware comprising the QUBEServo2,myRIO-1900,and LabVIEW.

关键词： Active damping injection angular acceleration estimator DC motor(DCm) speed regulation

Impacts of weaning age on dietary needs of whey permeate for pigs at 7 to 11 kg body weight

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Journal of Animal Science and Biotechnology 2022年第2期13卷 593-600页

作者： ki Beom Jang marcos Elias Duarte Jerry m.Purvis Sung Woo kim Department of Animal Science North Carolina State UniversityRaleighNC 27695USA N.G.Purvis Farm Inc RobbinsNC 27325USA.

Background:Whey permeate is an effective lactose source for nursery pigs and the most benefits are obtained when pigs are at 7 to 11 kg *** weaning ages could cause different length of early-weaner phases until 7 kg BW and thus it would influence the dietary need of whey permeate during 7 to 11 kg BW of *** study aimed to evaluate if weaning ages would affect the dietary needs of whey permeate for optimum growth performance of pigs at 7 to 11 kg ***:A total of 1,632 pigs were weaned at d 21(d 21.2±1.3)or d 25(d 24.6±1.1)after *** pigs had a common early-weaner feeds until they reached 7 kg *** pigs reached 7 kg BW within a weaning age group,they were allotted in a randomized complete block design(2×4 factorial).Two factors were weaning age groups(21 and 25 d of age)and varying whey permeate levels(7.50%,11.25%,15.00%,and 18.75%).Data were analyzed using the GLm and NLIN procedures of SAS for slope-ratio and broken-line analyses to determine the growth response to whey permeate and optimal daily whey permeate intake for the growth of the pigs weaned at different ***:Pigs weaned at 21 d of age had a common diet for 11 d to reach 7 kg BW whereas pigs weaned at 25 d of age needed 2 *** G:F of pigs weaned at 25 d of age responded to increased daily whey permeate intake greater(Pmeate intake or 17.0%and 14.4%of whey permeate for G:F of pigs weaned at 21 and 25 d of age,***:Pigs weaned at an older age with a short early-weaner phase had a greater growth response to whey permeate intake compared with pigs weaned at a younger age with a long early-weaner *** weaning ages affected dietary needs of whey permeate for optimum growth performance of pigs from 7 to 11 kg BW.

关键词： Growth performance Nursery pigs Weaning age Whey permeate