预应力长线台座的施工方法及要点

叙述我国中小型建筑构件厂最常用的预应力长线台座的建造过程，以及必须注意的事项及质量控制方法。     

超高吨位灌注桩静载试验中的预应力混凝土反力装置

在复兴大桥超高吨位灌注桩的静载试验,预应力混凝土反力装置替代了传统的钢梁反力系统。这套装置主要包括预应力锚桩、预应力承台与预应力反力梁。试验结果表明,直接获得超高吨位大直径嵌岩桩的极限承载力相当不易,而对这类问题预应力混凝土反力装置是值得考虑的。     

Familiarity and plausibility in conceptual combination: Reply to Gagné and Spalding (2006).

E. J. Wisniewski and G. L. Murphy (see record 2004-22496-015) suggested that the apparent effects of relation frequency in C. L. Gagné and E. J. Shoben's (1997; see record 1997-02349-004) conceptual combination experiments could be explained by differences between the familiarity and plausibility of their stimuli (noun-noun phrases). However, C. L. Gagné and T. L. Spalding (see record 2006-20573-017) argued that Wisniewski and Murphy's measures of plausibility and frequency are both sensitive to relation frequency. They also suggested that the stimuli were mostly novel, such that differences in familiarity could not explain Gagné and Shoben's findings. The current authors focus on the theoretical rationale for the plausibility and familiarity variables, arguing that the original interpretation of their findings is correct. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

体外CFRP筋预应力混凝土箱梁长期受力性能试验研究

碳纤维(CFRP)筋具有优异的物理力学性能,可用于替代传统的预应力钢筋。制作了体外配置碳纤维筋预应力混凝土箱梁模型,对持续均布荷载作用箱梁的截面应力重分布、长期挠曲变形及裂缝发展等规律进行了1001 d的试验观测。基于素混凝土柱体的实测徐变系数,运用双线性法和曲率法分别对试验箱梁的长期挠曲变形进行预测。试验结果表明:受压钢筋应变较初值增长225%～268%,受拉钢筋的应变较初值增长36.2～38.6%,混凝土表面压应变较初值增长164%～224%。按现行设计规范计算长期荷载作用特征裂缝宽度较实测值偏小11.8%～55.5%。跨中长期挠曲变形实测值为初始变形的2.32～2.42倍,较现行设计规范取值偏大18.5%。     

Bioactive Ca-P scaffolds used for bone reconstruction

1　INTRODUCTIONSkeletalreconstructionorregenerationisre quiredincasesinvolvinglargedefectscreatedbytu morresection ,trauma ,andskeletalabnormalities .Graftsandflapsofautogenoustissuearetwoofthemostsuccessfulmeansofreconstructionbecausetheyallowthetransplantationofbonecontainingbioactivemolecules,livecells ,andfrequently ,avascularsup plythatallowthetransplanttosurviveandremodeleveninhostileradiatedenvironments .However ,onlyaminimalamountoftissuecanbeharvestedforauto grafts,anditisverydiff…     

电子商务对企业集团营销手段的影响

介绍了电子商务，以及目前电子商务的发展趋势及对社会的影响，特别阐述了蓬勃发展的电子商务对企业集团的经营环境与手段的影响。     

扁管承压能力的有限元分析

应用有限元分析方法，对相同周长、相同壁厚的扁管在直边段和圆弧半径的不同比值条件下与所能承受最大外压力的关系进行了分析．并对计算分析取得的数据进行拟和得到了扁管在直边段和圆弧半径的不同比值条件下能承受最大外压力的关系及经验公式．     

A three-dimensional measurement system for robot applications

This paper presents a 3D noncontacting sensor system designed to measure the position and orientation of a robot end effector. This measurement system includes two parts: a tridimensional object including four spheres placed along the axes of a tetrahedron and a set of three orthogonally pointed cameras. The purpose is to design a measurement system characterized by easy relationships in order to satisfy real-time constraints. The system has been used in two experiments: first, to calibrate a parallel robot and validate the geometrical control performance, then as an exteroceptive sensor in an assembly task. The system computes position and orientation of the tetrahedron in 100 ms time. The position and orientation accuracy are, respectively, 0.6 mm and 0.2 deg in a workspace, being a cube with 0.3 m sides.     

基于无监督深度图像生成的盲降噪模型

鉴于有监督神经网络降噪模型的数据依赖缺陷,提出了一种基于无监督深度生成（UDIG）的盲降噪模型。首先,利用噪声水平评估（NLE）算法测定给定噪声图像中的噪声水平值并输入到主流FFDNet降噪模型中,所得到降噪后的图像（称为初步降噪图像）作为UDIG降噪模型的输入。其次,选用编码器—解码器架构作为UDIG模型的骨干网络并用UDIG模型的输出图像（即生成图像）分别与初步降噪图像、噪声图像之间的均方误差之和构建混合loss函数;再次,以loss最小化为优化目标,通过随机梯度下降（SGD）网络训练算法调整网络模型的参数值从而获得一系列生成图像;最后,当残差图像（噪声图像与生成图像之间）的标准差逼近之前NLE算法所测定的噪声水平估计值时及时终止网络迭代训练过程,从而确保生成图像（作为降噪后图像）的图像质量最佳。实验结果表明：与现有的主流降噪模型（算法）相比,UDIG降噪模型在降噪效果上具有显著优势。