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3D model retrieval is a very important research topic both in computer vision and computer graphics field. Most previous work is focusing on defining robust shape descriptor in order to get better retrieving accuracy. Unlike these work, we propose distance filter to improve the retrieving accuracy when using the existing shape descriptors. The main idea of distance filter is to eliminate distance...
The operational research for a helicopter with a dipping sonar to search a submarine under complex sea environment is studied. The movement models of the helicopter and submarine, the acoustic propagation model, the radiated noise model of submarine, and the detection model of dipping sonar are established. The acoustic propagation model considers the influences of sound speed profile and sea bottom...
A novel plasmonic lens consisting of metallic nanoslits with a patterned dielectric substrate is proposed. In the structure, all metallic nanoslits have the same geometrical parameters and interspacing. The phase of incident light is modulated beforehand by the substrate before they bump on the metal slits. The surface plasmon polaritons (SPPs) wave excited by the modulated light will be focused after...
In order to obtain high quality SAS image, phase error in SAS image is required to be corrected. Mapdrift algorithm is a traditional SAR autofocus algorithm which is used to correct quadratic phase error. In this paper Mapdrift algorithm is used to autofocus SAS image. For images without strong distributed target, traditional Mapdrift algorithm can get promising results, but for images containing...
Influence of ocean environment parameters is seldom considered in the traditional evaluation method for the detection range of sonar. Importing the idea of analyzing acoustic field under uncertain parameters of ocean environment, the influence of the variance of horizontal media on sonar detection range is taken into account when there are linear internal waves in the ocean. Monte Carlo method based...
Oxygen-enriched combustion in circulating fluidized bed (CFB) is a both technological and economical feasibly technology for carbon capture and storage. Therefore, in order to understand the coal combustion characteristics of oxygen-enriched combustion technology in CFB. The characteristics of coal combustion were analyzed by using the thermogravimetric analyzer (TGA) under different reaction conditions...
Back-propagation neural network model (BPNN) is an intelligent computational model based on stylebook learning. This model is different from the traditional adaptability symbolic logic reasoning method based on knowledge and rules. At the same time, BPNN model has shortcomings such as: the slowly convergence speed and partial minimum. In the process of adaptability evaluation, the factors were diverse,...
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