Results 11 to 20 of about 19,831 (152)
Rare Metals, EarlyView.ABSTRACT Porous NiTi alloys are widely used in biomedical and engineering fields. Using the PBF‐LB technique, the TPMS and Voronoi porous parts with a porosity of ∼67% and a minimum feature size of 0.15 ± 0.02 mm were fabricated. Although the bulk sample fabricated with the same parameters is defect‐free, μ‐CT reconstruction on the porous sample ...
Wen‐Hao Zeng +7 more
wiley +1 more source
Zhejiang Daxue xuebao. Lixue ban, 2007 自主设计了海量栅格空间数据库的逻辑模型和物理模型，实现将海量栅格数据存储于大型商业关系型数据库中；提出了基于CORBA(Commoh Object Request Broker Architecture)技术的海量栅格空间数据库引擎四层体系结构，并在此基础上给出运行实例，取得了良好效果，证明了自主栅格空间数据库引擎的可行性.
WANGNa(王娜) +3 more
doaj +1 more source
Study on the Mechanical Property of the “Turning” Structure System in Tall Buildings [PDF]
, 2008 “扭转体型”的高层建筑，由于其独特的几何形状给建筑的立面处理带来新意，近些年已有一些工程案例。众所周知，结构是建筑赖以存在的物质基础，与这种“扭转体型”建筑相配合的结构体系的抗侧力性能，是工程上关心的问题之一，然而国内外这方面的报道甚少。本文采用计算机数值模拟的方法，建立起扭转体型结构的计算模型，分析了不同荷载形式下结构受力和变形情况，并与框架结构形式进行了比较。研究分析表明，这种结构形式主要是由斜柱的轴力来抵抗水平荷载，属轴力体系范畴，并具有高效的抗侧力性能。在相同荷载作用下 ...
智平
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Rare Metals, EarlyView.ABSTRACT The transformative potential of gallium nitride high electron mobility transistors (GaN HEMTs) in advancing carbon‐neutral power systems remains bottlenecked by contact resistance (Rc) at the metal–semiconductor (M‐S) interface, a critical determinant of switching losses and frequency response.
Ji‐Zhou Zhang +8 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2022 目的 系统评价红细胞输注无效与输血次数、妊娠次数、有无意外抗体和有无IgG型抗体的关系，为预防红细胞输注无效的发生提供循证医学证据。方法 meta分析。检索国内外重要数据库，收集存在输血史、妊娠史和含有意外抗体、IgG型抗体的患者产生红细胞输注无效的相关文献，并按照纳入标准和排除标准筛选文献，提取数据，通过固定效应模型合并I2检验，绘制森林图来评估输血次数、妊娠次数、有无意外抗体和有无IgG型抗体与红细胞输注无效的关系。结果 经过筛选，共检索8篇中英文文献符合本文标准，共计17750例患者 ...
李鑫阳 +4 more
doaj
Rare Metals, EarlyView.ABSTRACT A major challenge in fabricating eutectic NiTiNb alloys is the incomplete melting of Nb due to its much higher melting point than the NiTi matrix. In this work, a novel electron‐beam freeform additive manufacturing strategy is developed to eliminate unmelted Nb particles and achieve a fully eutectic structure through independent dual‐wire ...
Qing‐Da Zhang +9 more
wiley +1 more source
ENERGY SAVING TECHNOLOGY STUDY ON EXISTENT DWELLINGS IN NANJING AREA [PDF]
, 2002 高校博士点资金资助项目 ,编号 :1999028622;; 江苏省建设委员会和江苏省墙体改革办公室资助项目 ,批文号 :苏建科(1998 ...
彭小云, 彭昌海, 王波, 邰惠新
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Rare Metals, EarlyView.ABSTRACT SnTe is considered a potential alternative to PbTe for thermoelectric applications. However, excessive carrier concentration and thermal conductivity result in poor thermoelectric performance. Herein, p‐type SnTe‐based materials Sn0.8‐xMn0.1Pb0.1SbxTe were synthesized, and the combined effects of Sb, Mn, and Pb were systematically investigated.
Jun‐Xiang Zhang +10 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2023 为提高风电塔架的抗震性能，提出了考虑耗能时序的混合式风电塔架的概念，重点研究了结构抗震设计与评估的关键指标——强度折减系数。利用等效单自由度体系表征具有三线性滞回特征的新型塔架，并基于不同周期和滞回参数组成的变量矩阵，以320条近场地震动作为激励对等效单自由度体系进行了大量非线性动力分析，获取了3 600万个强度折减系数。强度折减系数均值对结构周期及滞回参数敏感，故基于对比研究选取的对数正态分布概率模型，通过多轮非线性回归分析建立了一系列预测方程，从而实现强度折减系数概率谱模型的建立 ...
李红, 柯珂
doaj
Gallery structure design of one instructional laboratory building in one high school [PDF]
, 2007 通过对某中学教学实验楼连廊结构设计的介绍,重点讨论了连廊屋盖结构选型和优化分析以及特殊的支座处理方式,为同类建筑结构设计提供参考借鉴。According to the introduction of gallery structure design of one instructional laboratory building in one high school,it discusses the roof structure selection,optimum analysis and the ...
郭娟娟
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