In order to study the settling mechanism of particles in an air-solid magnetically stabilized fluidized bed(MSFB) for separation,we carried out free settling and quasi-zero settling tests on the tracing particles.The ...In order to study the settling mechanism of particles in an air-solid magnetically stabilized fluidized bed(MSFB) for separation,we carried out free settling and quasi-zero settling tests on the tracing particles.The results show that the main resistance forces as the tracing particles settled in an air-solid MSFB were motion resistance force and yield force.The motion resistance and yield forces greatly hindered the free settling of the particles by greatly decreasing the acceleration for settling process of the particles.The acceleration decreased from 3022.62 cm/s 2 to zero in 0.1 s,and in the end,the particles stopped in the air-solid MSFB.The yield force on particles increased with increasing the magnetic field intensity,resulting in decrease of the quasi-zero settling displacement.However,the yield force on particles decreased with increasing the fluidized air velocity,leading to increase of the quasi-zero settling displacement.When the structure and operating parameters of the air-solid MSFB were set up,the yield stress on particles stopped in an air-solid MSFB was a function of diameter and density of particles.The settling displacements of equal diameter particles increased with increasing their densities,and the settling displacements of equal density particles increased with increasing their diameters.展开更多
目标机动识别是空战态势感知中的关键问题.针对现有识别方法主观因素较多、模型复杂、难以满足实时性和识别准确率不够高等问题,提出一种基于运动分解和层次支持向量机(hierarchical support vector machine,H-SVM)的机动识别方法.利用v...目标机动识别是空战态势感知中的关键问题.针对现有识别方法主观因素较多、模型复杂、难以满足实时性和识别准确率不够高等问题,提出一种基于运动分解和层次支持向量机(hierarchical support vector machine,H-SVM)的机动识别方法.利用v-SVM二分类器构造H-SVM多分类器.结合运动分解思想,提出从不同方向对目标机动动作进行分解识别的方法,简化识别过程的同时增强识别的针对性.选取空战训练测量仪(air combat maneuvering instrument,ACMI)中的实测空战训练数据并构造机动识别样本数据,对识别模型进行训练,并通过实例仿真分析不同算法机动识别的性能.结果表明,所提出的识别方法具有较高的准确性和实时性,可以对战斗机的各类机动动作进行准确、快速地识别.展开更多
In this article, the results of researches on the sorting of seeds in the cotton ginning enterprises were described. The main goal of the research work is to theoretically study the technology of separating various im...In this article, the results of researches on the sorting of seeds in the cotton ginning enterprises were described. The main goal of the research work is to theoretically study the technology of separating various impurities and immature seeds from the composition of seeds. As a result, the theoretical basis for increasing the efficiency of the sorting process is created.展开更多
本文介绍美国 L os Alamos国家实验室推出的 KIVA程序 ,描述发展的 AL E法。使用 KIVA 程序 ,使日本 YANMAR4TN82柴油机燃烧室为工程计算背景 ,对其中空气运动进行三维数值模拟 ,并对计算结果进行分析 ,从而展示ω型燃烧室内空气动动变...本文介绍美国 L os Alamos国家实验室推出的 KIVA程序 ,描述发展的 AL E法。使用 KIVA 程序 ,使日本 YANMAR4TN82柴油机燃烧室为工程计算背景 ,对其中空气运动进行三维数值模拟 ,并对计算结果进行分析 ,从而展示ω型燃烧室内空气动动变化趋势。展开更多
基金supported by the National Natural Science Foundation of China (Nos. 51134022 and 51174203)the Key Project of Chinese National Programs for Fundamental Research and Development (No. 2012CB214904)+2 种基金the National Natural Science Foundation of China for Innovative Research Group (No. 50921002)the Natural Science Foundation of Jiangsu Province (No. BK2010002)the Fundamental Research Funds for the Central Universities (Nos. 2010QNB11 and 2010ZDP01A06)
文摘In order to study the settling mechanism of particles in an air-solid magnetically stabilized fluidized bed(MSFB) for separation,we carried out free settling and quasi-zero settling tests on the tracing particles.The results show that the main resistance forces as the tracing particles settled in an air-solid MSFB were motion resistance force and yield force.The motion resistance and yield forces greatly hindered the free settling of the particles by greatly decreasing the acceleration for settling process of the particles.The acceleration decreased from 3022.62 cm/s 2 to zero in 0.1 s,and in the end,the particles stopped in the air-solid MSFB.The yield force on particles increased with increasing the magnetic field intensity,resulting in decrease of the quasi-zero settling displacement.However,the yield force on particles decreased with increasing the fluidized air velocity,leading to increase of the quasi-zero settling displacement.When the structure and operating parameters of the air-solid MSFB were set up,the yield stress on particles stopped in an air-solid MSFB was a function of diameter and density of particles.The settling displacements of equal diameter particles increased with increasing their densities,and the settling displacements of equal density particles increased with increasing their diameters.
文摘In this article, the results of researches on the sorting of seeds in the cotton ginning enterprises were described. The main goal of the research work is to theoretically study the technology of separating various impurities and immature seeds from the composition of seeds. As a result, the theoretical basis for increasing the efficiency of the sorting process is created.
