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击实试验中试样制备时配水率的选定方法 被引量:1
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作者 刘弘 王丽华 +2 位作者 王大放 杨陆 杨雪 《东北水利水电》 2010年第5期42-43,共2页
击实试验过程中需制备不同含水率的试样用来击实,这就需要预测最优含水率,准确预测配水率对室内击实试验和指导现场施工提供土的压实性资料,有着非常重要的意义,是现场施工控制的基础。文中就试样制备时配水率的选定及如何预测配水率进... 击实试验过程中需制备不同含水率的试样用来击实,这就需要预测最优含水率,准确预测配水率对室内击实试验和指导现场施工提供土的压实性资料,有着非常重要的意义,是现场施工控制的基础。文中就试样制备时配水率的选定及如何预测配水率进行论述与分析评价。 展开更多
关键词 配水率 击实试验 试样制备
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中型灌区渠系优化配水方法改进研究
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作者 季洪涛 《水利技术监督》 2024年第8期161-165,共5页
针对传统中型灌区渠系优化配水方法目标设置单一,引入多目标蚁群算法对配水方法进行改进,并结合工程实例,探讨改进方法前后优化配水效果。结果表明:采用改进方法后,选取的2座中型灌区优化配水率可分别提高14.3%和16.5%。研究成果对于中... 针对传统中型灌区渠系优化配水方法目标设置单一,引入多目标蚁群算法对配水方法进行改进,并结合工程实例,探讨改进方法前后优化配水效果。结果表明:采用改进方法后,选取的2座中型灌区优化配水率可分别提高14.3%和16.5%。研究成果对于中型灌区渠系配水方案的科学制定具有参考价值。 展开更多
关键词 优化方法 方法改进 配水率优化 中型灌区
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Underwater Image Bidirectional Matching for Localization Based on SIFT 被引量:4
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作者 Yan Lin Bo Liu 《Journal of Marine Science and Application》 2014年第2期225-229,共5页
For the purpose of identifying the stern of the SWATH (Small Waterplane Area Twin Hull) availably and perfecting the detection technique of the SWATH ship's performance, this paper presents a novel bidirectional im... For the purpose of identifying the stern of the SWATH (Small Waterplane Area Twin Hull) availably and perfecting the detection technique of the SWATH ship's performance, this paper presents a novel bidirectional image registration strategy and mosaicing technique based on the scale invariant feature transform (SIFT) algorithm. The proposed method can help us observe the stern with a great visual angle for analyzing the performance of the control fins of the SWATH. SIFT is one of the most effective local features of the scale, rotation and illumination invariant. However, there are a few false match rates in this algorithm. In terms of underwater machine vision, only by acquiring an accurate match rate can we find an underwater robot rapidly and identify the location of the object. Therefore, firstly, the selection of the match ratio principle is put forward in this paper; secondly, some advantages of the bidirectional registration algorithm are concluded by analyzing the characteristics of the unidirectional matching method. Finally, an automatic underwater image splicing method is proposed on the basis of fixed dimension, and then the edge of the image's overlapping section is merged by the principal components analysis algorithm. The experimental results achieve a better registration and smooth mosaicing effect, demonstrating that the proposed method is effective. 展开更多
关键词 SWATH underwater image registration SIFT bidirectional matching strategy automatic stitching
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Leak Detection in Water Distribution Systems Using Bayesian Theory and Fisher’s Law 被引量:1
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作者 张宏伟 王丽娟 《Transactions of Tianjin University》 EI CAS 2011年第3期181-186,共6页
A leak detection method based on Bayesian theory and Fisher’s law was developed for water distribution systems. A hydraulic model was associated with the parameters of leaks (location, extent). The randomness of para... A leak detection method based on Bayesian theory and Fisher’s law was developed for water distribution systems. A hydraulic model was associated with the parameters of leaks (location, extent). The randomness of parameter values was quantified by probability density function and updated by Bayesian theory. Values of the parameters were estimated based on Fisher’s law. The amount of leaks was estimated by back propagation neural network. Based on flow characteristics in water distribution systems, the location of leaks can be estimated. The effectiveness of the proposed method was illustrated by simulated leak data of node pressure head and flow rate of pipelines in a test pipe network, and the leaks were spotted accurately and renovated on time. 展开更多
关键词 water distribution systems LEAK DETECTION EPANET Fisher's law Bayesian theory back propagationneural network
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Measurement of Two Phase Flow in Porous Medium Using High-resolution Magnetic Resonance Imaging 被引量:4
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作者 蒋兰兰 宋永臣 +4 位作者 刘瑜 杨明军 朱宁军 王晓静 豆斌林 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2013年第1期85-93,共9页
Measurement of two phase flow in porous medium for sequestration was carried out using high-resolution magnetic resonance imaging (MRI) technique. The porous medium was a packed bed of glass beads. Spin echo multi seq... Measurement of two phase flow in porous medium for sequestration was carried out using high-resolution magnetic resonance imaging (MRI) technique. The porous medium was a packed bed of glass beads. Spin echo multi sequence was used to measure the distribution of CO2 and water in the porous medium. The intensity images show that the fluid distribution is non-uniform due to its viscosity and pore structure of porous medium. The velocity distribution of fluids is calculated from the saturation of water and porosity of porous medium. The experimental results show that fluid velocities vary with time and position. The capillary dispersion rate donated the effects of capillary, which was largest at water saturations of 0.45. The displacement process is different between in BZ-02 and BZ-2. The final water residual saturation depends on permeability and porosity. 展开更多
关键词 two phase flow porous medium magnetic resonance imaging SATURATION CO2 velocity DISPLACEMENT
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