搜索结果: 1-15 共查到“工学 SPAN”相关记录17条 . 查询时间(0.046 秒)
In 1983, after a storm washed out an unstable pedestrian bridge over Ithaca’s Fall Creek, the Cornell student chapter of the American Society of Civil Engineers (ASCE) rebuilt it. Forty years later, i...
A METHOD FOR THE EXTRACTION OF LONG-TERM DEFORMATION CHARACTERISTICS OF LONG-SPAN HIGH-SPEED RAILWAY BRIDGES USING HIGH-RESOLUTION SAR IMAGES
InSAR High Resolution Deformation Characteristic Long-term Long-span Bridge
2016/11/23
Natural causes and high-speed train load will result in the structural deformation of long-span bridges, which greatly influence the safety operation of high-speed railway. Hence it is necessary to co...
New Technologies in Short Span Bridges: A Study of Three Innovative Systems
Short Span Bridges Three Innovative Systems
2014/10/22
Short span bridges are commonly used throughout the United States to span small waterways and highway overpasses. New technologies in the civil engineering industry have aided in the creation of many ...
Flexural performance of fire damaged and rehabilitated two span reinforced concrete slabs and beams
fire damage concrete continuous members rehabilitation flexural rigidity bearing capacity
2014/4/10
Five two-span reinforced concrete (RC) slabs and seven two-span RC beams were tested under the ISO 834 standard fire with different durations. CFRP strengthening was then applied to some of the specim...
European Conferences in Biomedical Optics will span the research-clinical gap（图）
biomedicine ECBO optical techniques
2011/4/21
Scientists, engineers, and clinicians working in optics and photonics to solve problems in biomedicine will present the field's latest advances at the upcoming European Conferences on Biomedical Optic...
SHAPE DETECTION OF STRUCTURAL CHANGES IN LONG TIME-SPAN AERIAL IMAGE SAMPLES BY NEW SALIENCY METHODS
Change detection Saliency points Active Contours Harris corner function Aerial photos
2014/6/12
The paper presents a novel, theoretically well-based methodology to find changes in remote sensing image series. The proposed method finds changes in images scanned with a long time-interv...
Semi-blind Nonlinear Equalization in Coherent Multi-Span Transmission System with Inhomogeneous Span Parameters
Fiber optics communications Coherent communications
2015/6/8
Semi-blind sequence is proposed for optimizing the nonlinear equalization parameters from limited prior knowledge of link. Its performance is demonstrated in an extreme case where the fiber type of a ...
Economic Study Comparing Raman Extended GPON and Mid-span GPON Reach Extenders
Fiber optics communications Fiber optics links subsystems
2015/6/4
We present an operational and capital cost study comparing newly proposed Raman amplified GPON systems with standardized, commercially available, mid-span GPON reach extenders.
采用溶剂非溶剂法重结晶CL-20, 研究了溶剂非溶剂体系中表面活性剂对CL-20晶体形貌的影响。用激光粒度仪、光学显微镜、红外光谱仪对重结晶CL-20的颗粒分布、形貌、晶型进行表征。结果表明，表面活性剂的种类、含量对CL-20的晶体形貌的影响较大，在以乙酸乙酯为溶剂、三氯甲烷为非溶剂、温度20℃、非溶剂稀释速度0.2～0.25mL/min、搅拌速度100r/min的转晶体系中，添加Span60...
Span/Tween为混合表面活性剂的微乳体系研究及纳米铁制备
微乳液 植物油 Span80 Tween60
2009/11/13
通过对异辛烷/Span80-Tween60/正丁醇、植物油/Span80-Tween60/正丁醇以及植物油/Span85-Tween60/正丁醇3种不同配比体系的研究，结果表明异辛烷/Span80-Tween60/正丁醇微乳体系较适合作微反应器，当体系HLB值为14、乳化剂含量(表面活性剂与油相质量比)为1:2，Co/S(助表面活性剂与复合表面活性剂质量比)为1:2时，可得到理想的微乳液体系. 利...
Span-20和Tween-80对发酵液中Nisin泡沫分离的影响
泡沫分离 非离子表面活性剂 乳链菌肽
2009/11/13
含0.5 g/L Tween-80发酵液；Tween-80的加入破坏了气泡表面的网状结构，因而泡沫层持气量较高；连续通气时，2种表面活性剂都会引起泡沫层高度降低，但Tween-80会增加泡沫层的稳定性. 当Tween-80浓度达0.5 g/L时，Nisin的收率大幅度提高，原因是分离过程中Nisin失活率减少.
Size Effect in Reinforced Concrete Beams With Short Shear Span and Without Stirrups
Reinforced concrete Bazant's size effect theory Carpinteri's size e ect theory
2009/10/14
For the to design of reinforced concrete beams with no stirrups, di erent equations have been formulated
by researchers. These equations either are on the side of extreme safety or do not include the...
工程车辆主驾驶座椅寿命测试系统设计与试验（Design and Experiment of Life-span Test System for Vehicle Driver Seat）
工程车辆 座椅 寿命
2009/5/22
针对工程车辆主驾驶座椅使用过程中出现的损坏问题，设计了工程车辆主驾驶座椅寿命测试系统。阐述了六自由度运动与视频的同步记录和同步再现的实现装置及控制技术，以及利用有线通讯来实现运动与视频同步播放的方法。以液压伺服控制六自由度运动模拟器为试验装置，应用运动与视频的同步记录和同步再现技术，对工程车辆主驾驶座椅进行了振动疲劳试验，试验结果验证了应用该系统进行车辆座椅开发的可行性。
Seismic design force for single-span slab-girder skewed bridges
Skewed bridge slab-girder seismic analysis cross-frame elastomeric bearing
2009/2/20
This paper investigates the validity of seismic design force recommended by AASHTO for single-span bridges. The prescribed force is equal to the products of soil factor , acceleration and tributary we...
THE EFFECT OF SUCTION ON THE FOUNDATIONS OF SUPER LONG SPAN BRIDGES DURING AN EARTHQUAKE
super long span bridge large depth foundation suction seismic design model experiment
2008/12/22
A rational method for the design of deep-water foundations of super long span bridges is desired. Attention is paid to the suction acting on the foundation bottom, which resist the rise of an under-w...