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Effect of cooling method on TiN precipitation behavior of high-titanium high-strength steel during solidification

Journal of Iron and steel Research(International) 2024年第7期31卷 1692-1703页

作者： Xue-jian Zhang Guang-wei Yang Yong Wan Yong-hong Wen Chuan-sheng Tang Ming-qi Liu Li-je Tian Key Laboratory of Metallurgical Emission Reduction and Resources Recycling Anhui University of TechnologyMa'anshan 243002AnhuiChina school of Metallurgical Engineering Anhui University of TechnologyMa'anshan 243002AnhuiChina Baosteel Central Research Institute Baoshan Iron and Steel Co.Ltd.Shanghai 201999China

Metallographic microscopy,scanning electron microscopy and TiN growth thermodynamic and kinetic equations were used to investigate the morphology,quantity,and size of TiN in the center of high-titanium high-strength steels under different solidification cooling *** results showed that TiN in the center of the experimental steels mainly existed in three forms:single,composite(Al2O3-TiN),and multi-particle *** began precipitating at around 1497℃(solidification fraction of 0.74).From the end of melting to solidification for 180 s,the cooling rates in the center of the experimental steels for furnace cooling,air cooling,refractory mold cooling,and cast iron mold cooling tended to stabilize at 0.17,0.93,1.65,and 2.15℃/s,*** size of TiN in the center of the experimental steel cooled using furnace cooling was mainly concentrated in the 5-15 pm *** contrast,the size of TiN in the center of the experimental steels cooled using air cooling,refractory mold cooling,and cast iron mold cooling were mainly concentrated in the 1-5 pm *** addition,their density of TiN in the center of the experimental steels is signif-icantly higher than that of the furnace-cooled experimental *** and kinetic precipitation models of TiN established predicted the growth size of TiN in a high-titanium high-strength steel when the solidification cooling rates are not below 0.93℃/s.

关键词： High-titanium steel Cooling method TiN Thermodynamics Kinetics

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Functionally graded structure of a nitride-strengthened Mg_(2)si-based hybrid composite

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Journal of Magnesium and Alloys 2024年第3期12卷 1239-1256页

作者： jeongho Yang Woongbeom Heogh Hogi Ju sukhyun Kang Tae-sik Jang Hyun-Do Jung Mohammad Jahazi seung Chul Han seong je Park Hyoung seop Kim susmita Bose Amit Bandyopadhyay Martin Byung-Guk Jun Young Won Kim Dae-kyeom Kim Rigoberto CAdvincula Clodualdo Aranas Jr sang Hoon Kim school of Mechanical Engineering Pusan National UniversityBusan 46241Republic of Korea Department of Mechanical Design Engineering Hanyang UniversitySeoul 04763Republic of Korea Process Research 3 Team LG Display Co.Ltd.PajuGyeonggi-do 10845Republic of Korea Department of Materials science and Engineering Chosun UniversityGwangju 61452Republic of Korea Institute of Well-Aging Medicare&Chosun University LAMP Center Chosun UniversityGwangju 61452Republic of Korea Division of Materials science and Engineering Hanyang UniversitySeoul 04763Republic of Korea Department of Mechanical Engineering École de Technologie SupérieureMontrealQuebec H3C 1K3Canada Material&Component Convergence R&D Center Korea Construction Equipment Technology InstituteGunsanJeollabuk-do 54002Republic of Korea school of Mechanical and Aerospace Engineering Nanyang Technological UniversitySingapore 639798Singapore Graduate Institute of Ferrous&Eco Materials Technology Pohang University of Science and TechnologyPohangGyeongsangbuk-do 37673Republic of Korea Advanced Institute for Materials Research Tohoku UniversitySendai 980-8577Japan Institute for Convergence Research and Education in Advanced Technology Yonsei UniversitySeoul 03722Republic of Korea school of Mechanical and Materials Engineering Washington State UniversityPullmanWashington 99164USA school of Mechanical Engineering Purdue UniversityWest LafayetteIndiana 47907USA Research Institute of Advanced Manufacturing Technology Korea Institute of Industrial TechnologyIncheon 21999Republic of Korea Department of Macromolecular science and Engineering Case Western Reserve UniversityClevelandOhio 44106USA Department of Chemical and Biomolecular Engineering and Joint Institute for Advanced Materials University of TennesseeKnoxvilleTennessee 37996USA Center for Nanophase Materials and sciences Oak Ridge National LaboratoryOak RidgeTennessee 37830USA Department of Mechanical Engineering University of New BrunswickFrederictonNew Brunswick E3B 5A3Cana

The ex-situ incorporation of the secondary siC reinforcement,along with the in-situ incorporation of the tertiary and quaternary Mg_(3)N_(2) and si_(3)N_(4) phases,in the primary matrix of Mg_(2)si is employed in order to provide ultimate wear resistance based on the laser-irradiation-induced inclusion of N_(2) gas during laser powder bed *** is substantialized based on both the thermal diffusion-and chemical reactionbased metallurgy of the Mg_(2)si–siC/nitride hybrid *** study also proposes a functional platform for systematically modulating a functionally graded structure and modeling build-direction-dependent architectonics during additive *** strategy enables the development of a compositional gradient from the center to the edge of each melt pool of the Mg_(2)si–siC/nitride hybrid ***,the coefficient of friction of the hybrid composite exhibits a 309.3%decrease to–1.67 compared to–0.54 for the conventional nonreinforced Mg_(2)si structure,while the tensile strength exhibits a 171.3%increase to 831.5 MPa compared to 485.3 MPa for the conventional *** outstanding mechanical behavior is due to the(1)the complementary and synergistic reinforcement effects of the siC and nitride compounds,each of which possesses an intrinsically high hardness,and(2)the strong adhesion of these compounds to the Mg_(2)si matrix despite their small sizes and low concentrations.

关键词： Laser powder bed fusion Mg_(2)si-siC/nitride hybrid composite Both the thermal diffusion-and chemical reaction-based metallurgy Functionally graded structure Compositional gradient Wear resistance.

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Additive manufacturing of flexible 3D surface electrodes for electrostatic adhesion control and smart robotic gripping

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摩擦:英文版 2023年第11期11卷 1974-1986页

作者： Dong Geun KIM Hyeongmin je AJohn HART sanha KIM Department of Mechanical Engineering Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea Department of Mechanical Engineering Massachusetts Institute of TechnologyCambridgeMA 02139USA

Mechanically flexible surface structures with embedded conductive electrodes are attractive in contact-based devices,such as those used in reversible dry/adhesion and tactile *** shapes of the surface structures strongly determine the contact behavior and therefore the resulting adhesion and sensing functionalities;however,available features are often restricted by fabrication ***,we additively manufacture elastomeric structure arrays with diverse angles,shapes,and sizes;this is followed by integration of conductive nanowire *** fabricated flexible three-dimensional(3D)surface electrodes are mechanically compliant and electrically conductive,providing multifunctional ability to sense touch and to switch adhesion via a combined effect of shear-and electro *** designed soft,anisotropic flexible structures to mimic the gecko’s reversible adhesion,which is governed by van der Waals forces;we integrated nanowires to further manipulate the localized electric field among the adjacent flexible 3D surface electrodes to provide additional means to digitally tune the electrostatic attraction at the contact *** addition,the composite surface can sense the contact force via capacitive *** our flexible 3D surface electrodes,we demonstrate a complete soft gripper that can grasp diverse convex objects,including metal,ceramic,and plastic products,as well as fresh fruits,and that exhibits 72%greater electroadhesive gripping force when voltage is applied.

关键词： electroadhesion tactile sensing robotic gripper additive manufacturing dry adhesive

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基于增强现实和目标识别的ssVEP脑-机接口技术研究

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电光系统 2024年第2期 33-39页

作者：马留洋蒋龙杰王宁中国电子科技集团公司第二十七研究所郑州450047

文章将增强现实技术、基于人工智能的目标识别技术与BCI相结合,通过采用微软的Hololens作为视觉刺激呈现平台,实时显示前端视频采集设备获取的场景信息,利用YO-LO检测场景目标,根据目标数量映射相应数量闪烁刺激色块,受试者利用ssVEP对... 详细信息

文章将增强现实技术、基于人工智能的目标识别技术与BCI相结合,通过采用微软的Hololens作为视觉刺激呈现平台,实时显示前端视频采集设备获取的场景信息,利用YO-LO检测场景目标,根据目标数量映射相应数量闪烁刺激色块,受试者利用ssVEP对检测到的目标进行敏感目标筛选。8名受试者进行相应试验,并成功诱发出明显ssVEP信号,利用1.5s数据提取4种频率特征,分别获得90.00%,90.00%94.00%和90.00%的平均识别率,在敏感目标在线检测试验中获得很好的效果。该研究表明,本系统为敏感目标筛选提供了新的技术方案,并为BCI系统的日常化应用提供了可能性。

关键词：脑-机接口稳态视觉诱发电位增强现实人工智能 YOLO

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A New Inertial self-adaptive Gradient Algorithm for the split Feasibility Problem and an Application to the sparse Recovery Problem

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Acta Mathematica sinica,English series 2023年第12期39卷 2489-2506页

作者： Nguyen The VINH Pham Thi HOAI Le Anh DUNG Yeol je CHO Department of Mathematical Analysis University of Transport and Communications3 Cau Giay StreetHanoiVietnam Department of Applied Mathematics School of Applied Mathematics and InformaticsHano University of Science and Technology1 Dai Co Viet RoadHanoiVietnam Department of Mathematics and Informatics Hanoi University of Education136 Xuan ThuyCau GiayHanoiVietnam Department of Mathematics Education Gyeongsang National UniversityJinju52828Republicof Korea

In this paper,by combining the inertial technique and the gradient descent method with Polyak's stepsizes,we propose a novel inertial self-adaptive gradient algorithm to solve the split feasi-bility problem in Hilbert spaces and prove some strong and weak convergence theorems of our method under standard *** examine the performance of our method on the sparse recovery prob-lem beside an example in an infinite dimensional Hilbert space with synthetic data and give some numerical results to show the potential applicability of the proposed method and comparisons with related methods emphasize it further.

关键词： split feasibility problem CQ algorithm Hilbert space sparse recovery problem

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不同光质对藏川杨生长及光合特性的影响

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西南农业学报 2024年第5期37卷 1019-1027页

作者：刘金萍王静敏陈智华马少杰纵丹何承忠西南林业大学/云南省高校林木遗传改良与繁育重点实验室昆明650224 西南林业大学/西南山地森林资源保育与利用教育部重点实验室昆明650224

【目的】研究不同光质对藏川杨幼苗生长和光合特性的影响,进一步探究藏川杨对高原地区强光环境的响应,为高光效杨树的筛选提供理论依据。【方法】以当年生藏川杨扦插苗为试材,设置白、蓝、绿3种颜色薄膜,以白膜为对照,测定分析生长及生... 详细信息

【目的】研究不同光质对藏川杨幼苗生长和光合特性的影响,进一步探究藏川杨对高原地区强光环境的响应,为高光效杨树的筛选提供理论依据。【方法】以当年生藏川杨扦插苗为试材,设置白、蓝、绿3种颜色薄膜,以白膜为对照,测定分析生长及生理指标、叶绿素荧光和光合参数。【结果】蓝膜和绿膜均显著提高藏川杨幼苗株高,分别提高28.1%和38.5%,而蓝膜显著减小幼苗叶宽,降低33.3%;蓝膜显著增加幼苗叶片光合色素(31.74%)、可溶性总糖(55.57%)和蔗糖含量(78.58%),而绿膜则显著减少幼苗叶片可溶性总糖和淀粉积累;蓝膜可提高光下PsⅡ电子传递量子产率(Φ_(PsⅡ)),降低非光化学淬灭系数(NPQ),而绿膜显著降低电子传递速率(ETR)和Φ_(PsⅡ),提高NPQ;3种颜色薄膜处理下藏川杨叶片净光合速率(P_(n))的日变化曲线均呈“双峰型”,整体P_(n)数值大小顺序为蓝膜>白膜>绿膜,不同颜色薄膜处理下藏川杨叶片均在12:00时出现光合午休现象。气孔导度(G_(s))和蒸腾速率(T_(r))总体变化趋势与P_(n)类似,而胞间CO_(2)浓度(C_(i))则呈“W型”曲线;蓝膜显著提高了藏川杨叶片最大净光合速率(P_(n max))、光补偿点(LCP)、CO_(2)饱和点(CCP),绿膜降低其最大净光合速率(P_(n max))、暗呼吸速率(R_(d))和光补偿点(LCP),显著提高光呼吸速率(R_(p))、CO_(2)补偿点(CCP)。【结论】生长环境中的光质能够影响藏川杨的光合效率及生长发育。通过覆盖蓝色薄膜改善光质能增强藏川杨幼苗叶片光合色素含量、提高弱光和CO_(2)利用率、提高光合效率、增强光合产物积累、促进植株生长。

关键词：光质藏川杨叶绿素荧光幼苗生长光合特性

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Removal of unexpected schwannoma with superficial parotidectomy using modified-Blair incision and superficial musculoaponeurotic system folding: A case report

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World Journal of Clinical Cases 2023年第18期11卷 4438-4445页

作者： Ha-Jong Nam Hwan Jun Choi je-Yeon Byeon syeo-Young Wee Department of Plastic and Reconstructive surgery Soonchunhyang University Gumi HospitalGumi-si 39371Gyeonsangbuk-doSouth Korea Department of Plastic and Reconstructive surgery Soonchunhyang University Cheonan HospitalCheonan-si 31151Chungcheongnam-doSouth Korea

BACKGROUND When a firm facial mass in the cheek region is associated with a high index of clinical suspicion of its being of parotid gland origin,preventive parotidectomy is invariably *** report a rare case of a schwannoma that was suspected to be of parotid gland origin in a patient,who underwent successful surgical management using a modified-Blair incision and superficial musculoaponeurotic system(sMAs)layer folding *** sUMMARY A 27-year-old woman presented to the hospital for evaluation of a firm,fixed,non-tender mass(2.5 cm×3.5 cm),located anterior to the right ear,of 1 year’s ***-enhanced facial computed tomography revealed a wellencapsulated,low-density mass adherent to the superficial lobe of the right parotid gland,with a high index of clinical suspicion of an accessory parotid gland *** patient was scheduled to undergo resection of the mass and superficial *** underwent surgery using a modified-Blair incision,and the sMAs layer was folded posteriorly to reconstruct the *** examination confirmed the diagnosis of a schwannoma.,and we observed no postoperative complications such as hematoma,infection,or abnormal facial *** incision scar was unnoticeable 2 mo postoperatively,and the facial contour was maintained without any differences between the affected and unaffected *** We used a modified-Blair incision and sMAs layer folding method to achieve aesthetically good results following resection of a rare schwannoma with superficial parotidectomy in the cheek region.

关键词： schwannoma Parotid gland superficial musculoaponeurotic system Case report

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Aqueous-processable,naphthalene diimide-based polymers for eco-friendly fabrication of high-performance,n-type organic electrolyte-gated transistors

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science China Chemistry 2022年第5期65卷 973-978页

作者： Dahyun jeong Min je Kim seungjin Lee Jin-Woo Lee Youngwoong Kim Hyeong Jun Kim jeong Ho Cho Bumjoon J.Kim Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Department of Chemical and Biomolecular Engineering Yonsei UniversitySeoul 03722Republic of Korea Department of Chemical and Biomolecular Engineering Sogang UniversitySeoul 04107Republic of Korea

Organic electrolyte-gated transistors(OEGTs) have the benefits of low power consumption and large current ***,the electrical performance of n-type OEGTs lags far behind that of p-type *** this study,we design a series of polymers,P(NDITEG-T) and P(NDIMTEG-T),comprising a naphthalene diimide backbone for n-type charge transport and oligo(ethylene glycol)(OEG) side chains for high ionic conductivity and eco-friendly solution *** incorporation of the OEG chain facilitates the electrochemical doping of the semiconductor by ions to realize high-performance,n-type ***,in OEGTs,P(NDITEG-T) achieves a high electron mobility of 1.0 × 10^(-1) cm^(2) V^(-1) s^(-1),which represents the highest value reported for solution-processed,n-type *** is noted that the fabrication of the OEGTs is achieved by solution processing with eco-friendly ethanol/water mixtures in virtue of the hydrophilic OEG *** work demonstrates the molecular design of the P(NDITEG-T) polymer and its significant ability to produce aqueous-processable,high-performance,and n-type OEGTs.

关键词： organic electrolyte-gated transistors n-type transistors oligo(ethylene glycol)polymers eco-friendly solution process high electron mobility

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Publisher Correction to:Highly Elastic,Bioresorbable Polymeric Materials for stretchable,Transient Electronic systems

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Nano-Micro Letters 2024年第8期16卷 417-417页

作者： jeong‑Woong shin Dong‑je Kim Tae‑Min Jang Won Bae Han Joong Hoon Lee Gwan‑Jin Ko seung Min Yang Kaveti Rajaram sungkeun Han Heeseok Kang Jun Hyeon Lim Chan‑Hwi Eom Amay JBandodkar Hanul Min suk‑Won Hwang KU‑KIsT Graduate school of Converging science and Technology Korea University145 Anam‑roSeongbuk‑guSeoul 02841Republic of Korea sK Hynix 2091Gyeongchung‑daeroBubal‑eupIcheon‑siGyeonggi‑do 17336Republic of Korea Hanwha systems Co. Ltd.188Pangyoyeok‑roBundang‑guSeongnam‑siGyeonggi‑do 13524Republic of Korea Department of Electrical and Computer Engineering North Carolina State UniversityRaleighNC 27606USA Center for Advanced self‑Powered systems of Integrated sensors and Technologies(AssIsT) North Carolina State UniversityRaleighNC 27606USA Department of Integrative Energy Engineering Korea University145 Anam‑roSeongbuk‑guSeoul 02841Republic of Korea Biomaterials Research Center Korea Institute of Science and Technology(KIST)5 Hwarang‑ro 14‑gilSeongbuk‑guSeoul 02792Republic of Korea semiconductor R&D Center Samsung Electronics Co.Ltd.Hwaseong‑siGyeonggi‑do 18448Republic of Korea Center for Advanced Biomolecular Recognition Biomedical Research DivisionKorea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea

Due to typesetting mistake,Hanul Min was missed to be denoted as a corresponding author in the *** type-setter apologizes for *** original article has been *** Access This article is licensed under a Creative Commons Attribution 4.0 International License,which permits use,sharing,adaptation,distribution and reproduction in any medium or format,as long as you give appropriate credit to the original author(s)and the source,provide a link to the Creative Commons licence,and indicate if changes were *** images or other third party material in this article are included in the article’s Creative Commons licence,unless indicated otherwise in a credit line to the *** material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use,you will need to obtain permission directly from the copyright holder.

关键词： Creative Elastic Highly

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Role of serotonin in development of esophageal and gastric fundal varices

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World Journal of Gastroenterology 2010年第48期16卷 6135-6138页

作者： jelena s Rudi Dorde M ulafi Duko s Mirkovi Rada s jei Miodrag N Krsti Clinic of Gastroenterology Clinical Center of SerbiaFaculty of MedicineUniversity of Belgrade Centre of Medical Biochemistry Clinical Center of SerbiaSchool of PharmacyUniversity of Belgrade

AIM:To determine the effect of free serotonin concentrations in plasma on development of esophageal and gastric fundal varices. METHODs:This prospective study included 33 patients with liver cirrhosis and 24 healthy controls. Ultrasonography and measurement of serotonin concentration in plasma were carried out in both groups of subjects. The upper fiber panendoscopy was performed only in patients with liver cirrhosis. REsULTs:The mean plasma free serotonin levels were much higher in liver cirrhosis patients than in healthy controls (219.0 ± 24.2 nmol/L vs 65.4 ± 18.7 nmol/L,P s no significant correlation be-tween serotonin concentration in plasma and the size of the esophageal varices according to spearman coefficient of correlation (rs =-0.217,P > 0.05). However,the correlation of plasma serotonin concentration and gastric fundal varices was highly significant (rs =-0.601,P sION:Free serotonin is significant in pathogenesis of portal hypertension especially in development of fundal varices,indicating the clinical value of serotonergic receptor blockers in these patients.

关键词： serotonin Portal hypertension Esophageal varices Fundal varices Platelets

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