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钢-混凝土组合连续弯箱梁抗火性能与设计方法

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交通运输工程学报 2021年第4期21卷 139-149页

作者：宋超杰张岗(指导) 贺拴海 KODUR v K 黄侨李徐阳长安大学公路学院陕西西安710064 密歇根州立大学土木与环境工程系密歇根东兰辛48824 东南大学交通学院江苏南京211189

为研究提高钢-混凝土组合连续弯箱梁抗火性能的策略,选取某三跨钢-混凝土组合连续弯箱梁为研究对象,利用通用有限元软件ANSYS建立了其在火灾下的三维非线性两阶段分析模型;基于已有热-结构耦合分析方法,模型考虑了钢箱梁内空腔辐射传热... 详细信息

为研究提高钢-混凝土组合连续弯箱梁抗火性能的策略,选取某三跨钢-混凝土组合连续弯箱梁为研究对象,利用通用有限元软件ANSYS建立了其在火灾下的三维非线性两阶段分析模型;基于已有热-结构耦合分析方法,模型考虑了钢箱梁内空腔辐射传热过程和其上翼缘与混凝土板的接触边界条件;将模型得到的预测结果与试验数据进行了比较,验证了模型的可靠性;采用建立的模型在不同纵向受火位置、火灾强度和荷载水平作用下对钢-混凝土组合连续弯箱梁跨中挠度进行了参数敏感性分析,研究了其极限承载能力和刚度衰变规律;以火灾下跨中挠度为评估指标,提出了针对钢-混凝土组合连续弯箱梁的抗火设计方法。研究结果表明:在对称火和结构荷载作用下,钢-混凝土组合连续弯箱梁外边缘挠度大于内边缘挠度,且荷载越大,火灾越严重,这一效应越显著;在油罐车等过火面积较大的火灾作用下,刚度较极限承载能力衰退更快,与常温下的钢-混凝土组合连续弯箱梁极限承载能力和刚度相比,边跨受火16 min时极限承载能力和刚度分别降低至29%和14%,中跨受火28 min时极限承载能力和刚度分别降低至31%和22%;在钢-混凝土组合连续弯箱梁抗火设计中,应首先提高外侧钢箱梁在火灾下的刚度,增多和加宽外侧钢箱梁底板纵向加劲肋可使边跨受火20 min后内外侧钢箱梁跨中挠度差分别减小23%和30%,中跨受火32 min后内外侧钢箱梁跨中挠度差分别减小22%和27%。

关键词：桥梁工程抗火设计有限元分析钢-混凝土组合连续弯箱梁抗火性能极限承载能力刚度

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THE INDIAN WELL

英语学习 1996年第5期 58-62页

作者： W.v.Tilberg Clark

Jim Sutler and his donkey arrived at a wooded Indian wellabout *** of heat in the desert had worn both theman and animal almost to the bones.~1 Sutler stopped inthe middle of the grass,took off his hat and looked at t... 详细信息

关键词： THE INDIAN WELL

Development of a methodology for assessing the adequacy of electric power systems

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Global Energy Interconnection 2022年第5期5卷 543-550页

作者： Dmitry S.Krupenev Denis A.Boyarkin Dmitrii v.Iakubovskii Melentiev Energy Systems Institute of Siberian Branch of the Russian Academy of Sciences Lermontov str.130Irkutsk664033Russia

This study presents the results of a research into the developing a methodology for assessing the adequacy of advanced electric power systems characterized by the integration of various innovative technologies,which complicates their *** methodology development is aimed at solving two main problems:(1)increase the adequacy of modeling the processes that occur in the electric power system and (2)enhance the computational efficiency of the adequacy assessment *** study proposes a new mathematical model to minimize the power shortage and enhance the adequacy of modeling the *** model considers quadratic power transmission losses and network *** computational efficiency of the adequacy assessment methodology is enhanced using efficient random-number generators to form the calculated states of electric power systems and machine learning methods to assess power shortages and other reliability characteristics in the calculated states.

关键词： Electric power systems Adequacy Power shortage minimization Pseudo-and quasi-random number generation Machine learning methods.

Synthesis and characterization of multifunctional ZnBr_(2)/PvA polymer dielectrics

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Journal of Advanced Dielectrics 2016年第4期6卷 22-30页

作者： Jagadish Naik R.F.Bhajantri Sunil G.Rathod T.Sheela v.Ravindrachary Department of Physics Mangalore University Mangalagangotri-574199KarnatakaIndia Department of Physics Karnatak University Pavate NagarDharwad-580003KarnatakaIndia

Different weight percentage of ZnBr_(2) doped poly(vinyl alcohol)(PvA)free standing composite films were prepared using solution casting *** films were characterized for analyzing structural,dielectric,electrochemical *** paper mainly focused to understand the contribution of physical phenomenon on conductivity in terms of dielectric *** spectrum confirms the interaction between ZnBr_(2) and ***-capacitive behavior observed from cyclic *** properties of the composites follow non-Debye type *** conducting phenomenon occurs due to hopping of ions between coordination sites present in the composite and the segmental relaxation of polymer chain.

关键词： Poly(vinyl alcohol) polymer electrolytes cyclic voltametry dielectrics zinc bromide.

高分辨率定量遥感的偏振光效应与偏振遥感新领域

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遥感学报 2018年第6期22卷 901-916页

作者：晏磊顾行发褚君浩尤政刘世元 Hugh Motimor v.Chandrasekar 北京大学地球与空间科学学院遥感与地理信息系统研究所、空间信息集成与3S工程应用北京市重点实验室北京100871 中国科学院遥感与数字地球研究所北京100101 中国科学院上海技术物理研究所上海200083 清华大学精密仪器系北京100084 华中科技大学数字制造装备与技术国家重点实验室武汉430074 Rutherford Appleton Laboratory Space Science and Technologies Facilities Counci Colorado State University Fort CollinsColorado 80523

随着航空航天高分辨率观测手段的逐步成熟,定量遥感在有效解决了光学地表多尺度效应后,更高分辨率的光学偏振效应在地表、大气、仪器3大要素方面逐步全面凸显出来,并直接决定或影响高分辨率观测系统的定量遥感效能实现和质量保障。例如... 详细信息

随着航空航天高分辨率观测手段的逐步成熟,定量遥感在有效解决了光学地表多尺度效应后,更高分辨率的光学偏振效应在地表、大气、仪器3大要素方面逐步全面凸显出来,并直接决定或影响高分辨率观测系统的定量遥感效能实现和质量保障。例如,植被冠层极其微弱的多次散射反射偏振效应,如果不加扣除其模型误差达到136%;大气衰减本质是大气偏振效应,是遥感反演的最大误差源,误差达到5%—30%,偏振手段扣除大气误差目前已可以降低一半以上的误差;观测仪器扣除多次散射透射偏振光后,可以实现5 nm分辨率下0.1—0.3 nm高光谱定标能力,并借助偏振强化光噪声分离出中心波长偏移和带宽退化的误差根源。借助偏振"强光弱化,弱光强化",能够实现稳定度达10^(-8)月球辐亮度基准观测,为遥感辐亮度定标不确定度由7%到1%—2%跨越提供可能。

关键词：高分辨率定量遥感偏振光效应地表偏振效应大气偏振效应仪器偏振效应偏振遥感

Application of response surface methodology to maximize tensile strength and minimize interface hardness of friction welded dissimilar joints of austenitic stainless steel and copper alloy

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Transactions of Nonferrous Metals Society of China 2013年第8期23卷 2250-2259页

作者： G. vAIRAMANI T. SENTHIL KUMAR S. MALARvIZHI v. BALASUBRAMANIAN Department of Mechanical Engineering Seshasayee Institute of Technology Department of Mechanical Engineering Anna University of ChennaiTiruchirappalli Campus Centre for Materials Joining & Research (CEMAJOR) Department of Manufacturing EngineeringAnnamalai University

An attempt was made to optimize friction welding parameters to attain a minimum hardness at the interface and a maximum tensile strength of the dissimilar joints of AISI 304 austenitic stainless steel （ASS） and copper （Cu） alloy using response surface methodology （RSM）. Three-factor, five-level central composite design matrix was used to specify experimental conditions. Twenty joints were fabricated using ASS and Cu alloy. Tensile strength and interface hardness were measured experimentally. Analysis of variance （ANOvA） method was used to find out significant main and interaction parameters and empirical relationships were developed using regression analysis. The friction welding parameters were optimized by constructing response graphs and contour plots using design expert software. The developed empirical relationships can be effectively used to predict tensile strength and interface hardness of friction welded ASS-Cu joints at 95% confidence level. The developed contour plots can be used to attain required level of optimum conditions to join ASS-Cu alloy by friction welding process.

关键词： friction welding austenitic stainless steel copper alloy tensile strength interface hardness response surface methodology

Composite technology of earthwork construction on taliks in cryolithic zones

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Research in Cold and Arid Regions 2013年第5期5卷 577-581页

作者： Svyatoslav Ya.Lutskiy Taisiya v.Shepitko Alexander M.Cherkasov Federal State-Funded Educational Institution of Higher vocational Education Moscow State University of Railway Engineering (MGUPS (MIIT)) Institute of Rail Track Construction and Structures Permafrost Research Laboratory Federal State-Funded Educational Institution of Higher Vocational EducationMoscow State University of Railway Engineering (MGUPS (MIIT))

This paper reviews construction and technological solutions for roadbeds in talik areas of permafrost soil, and proposes an integrated technology for prevention and elimination of taliks during construction periods. It also summarizes the expe- rience of process regulation scheduling and soil conditions monitoring during construction.

关键词： integrated technology permafrost soil taliks technological adjustment

Contribution of functional KIR3DL1 to ankylosing spondylitis

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Cellular & Molecular Immunology 2010年第6期7卷 471-476页

作者： Ivan v Zvyagin Ilgar Z Mamedov Olga v Britanova Dmitriy B Staroverov Evgeni L Nasonov Anna G Bochkova Anna v Chkalina Alexei A Kotlobay Dmitriy O Korostin Denis v Rebrikov Sergey Lukyanov Yuri B Lebedev Dmitriy M Chudakov Shemiakin-Ovchinnikov Institute of Bioorganic Chemistry RASMoscowRussia Institute of Rheumatology RAMSMoscowRussia DNA-Technology JSC MoscowRussia vavilov Institute of General Genetics MoscowRussia

Increasing evidence points to a role for killer immunoglobulin-like receptors(KIRs)in the development of autoimmune *** particular,a positive association of KIR3DS1(activating receptor)and a negative association of KIR3DL1(inhibitory receptor)alleles with ankylosing spondylitis(AS)have been reported by several ***,none of the studies analyzed these associations in the context of functionality of polymorphic *** better understand how the KIR3DL1/3DS1 genes determine susceptibility to AS,we analyzed the frequencies of alleles and genotypes encoding functional(KIR3DL1*F)and non-functional(KIR3DL1*004)*** genotyped 83 AS patients and 107 human leukocyte antigen(HLA)-B27-positive healthy controls from the Russian Caucasian population using a two-stage sequence-specific primer PCR,which distinguishes KIR3DS1,KIR3DL1*F and KIR3DL1*004 *** the patients carrying two functional KIR3DL1 alleles,those alleles were additionally genotyped to identify KIR3DL1*005 and KIR3DL1*007 alleles,which are functional but are expressed at low ***3DL1 was negatively associated with AS at the expense of KIR3DL1*F but not of KIR3DL1**** finding indicates that the inhibitory KIR3DL1 receptor protects against the development of AS and is not simply a passive counterpart of the segregating KIR3DS1 allele encoding the activating ***,analysis of genotype frequencies indicates that the presence of KIR3DS1 is a more important factor for AS susceptibility than the absence of KIR3DL1**** activation of either natural killer(NK)or T cells via the KIR3DS1 receptor can be one of the critical events in AS development,while the presence of the functional KIR3DL1 receptor has a protective ***,even individuals with a genotype that carried two inhibitory KIR3DL1 alleles expressed at high levels could develop AS.

关键词： ankylosing spondylitis autoimmune disease HLA-B27 KIR KIR3DL1 KIR3DS1 KIR3DL1*004 NK cell T cell

Single-cell profiling reveals the trajectories of natural killer cell differentiation in bone marrow and a stress signature induced by acute myeloid leukemia

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Cellular & Molecular Immunology 2021年第11期18卷 1290-1304页

作者： Adeline Crinier Pierre-Yves Dumas Bertrand Escalière Christelle Piperoglou Laurine Gil Arnaud villacreces Frédéric vély Zoran Ivanovic Pierre Milpied Émilie Narni-Mancinelli Éric vivier Aix Marseille University CNRSINSERMCentre d’Immunologie de Marseille-LuminyMarseilleFrance CHU Bordeaux Service d’Hématologie Clinique et de Thérapie CellulaireBordeauxFrance Bordeaux University BordeauxFrance Institut National de la Santéet de la Recherche Médicale U1035BordeauxFrance APHM Hôpital de la TimoneMarseille-ImmunopôleMarseilleFrance Établissement Français du Sang Nouvelle Aquitaine BordeauxFrance Innate Pharma Research Laboratories Innate PharmaMarseilleFrance

Natural killer(NK)cells are innate cytotoxic lymphoid cells(ILCs)involved in the killing of infected and tumor *** human and mouse NK cells from the spleen and blood,we previously identified by single-cell RNA sequencing(scRNAseq)two similar major subsets,NK1 and *** the same technology,we report here the identification,by single-cell RNA sequencing(scRNAseq),of three NK cell subpopulations in human bone *** analysis identified a subset of resident CD56^(bright) NK cells,NK0 cells,as the precursor of both circulating CD56dim NK1-like NK cells and CD56^(bright) NK2-like NK cells in human bone marrow and spleen under physiological *** profiles of bone marrow NK cells from patients with acute myeloid leukemia(AML)exhibited stress-induced repression of NK cell effector functions,highlighting the profound impact of this disease on NK cell *** marrow NK cells from AML patients exhibited reduced levels of CD160,but the CD160high group had a significantly higher survival rate.

关键词： NK cells scRNASeq AML