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Search Results: 1 - 10 of 86676 matches for " 曹海青 "
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超细玻璃棉空间吸声体在纺织厂降噪中的应用和研究
海青,
工业建筑 , 1993, DOI: 10.13204/j.gyjz199311003
Abstract: 超细玻璃棉空间吸声体在纺织厂降噪中的应用和研究,无论在国内、国外都是一个较新的课题。本文论述了一种适用于纺织厂的空间吸声体,它的降噪效果显著,价格低,施工安装简便。它对改善纺织企业的声环境将起十分重要的作用。
海上小型漂浮式卫星天线非光滑PID控制研究
Non-Smooth PID Controller of a Small Floating Satellite Antenna in Sea

海青,姚志英
- , 2018, DOI: 10.15918/j.tbit1001-0645.2018.04.012
Abstract: 以有界扰动标准二阶积分系统为对象,研究了一种快速高稳、扰动抑制能力强的非光滑控制器,证明了这种非光滑控制器的稳定性,验证了它的强扰动抑制能力;研究了海洋环境扰动的特性,构建了不同扰动的物理模型,分析了非光滑控制器对不同扰动的抑制能力;基于新的非光滑控制器设计了小型漂浮式卫星天线方位非光滑PID控制器,应用于海上军侦察卫星天线的方位控制.通过仿真实验和半实物实验验证了天线方位非光滑PID控制器可以实现天线姿态的快速稳定控制,可以很好地抑制海洋环境中的扰动,保证天线与目标卫星间的高质量通信.
A novel non-smooth controller of the second order control system with a disturbance was proposed to control the attitude of a small floating satellite antenna in sea. Aiming at the standard second order integral system with a bounded disturbance,a novel non-smooth controller with a better rapidity,stability and strong disturbance rejection was studied. Several works were carried out including the stability proving,the strong disturbance rejection validating,sea disturbance properties analyzing,the models developing,and the disturbance rejection ability analyzing with different disturbances. Finally,a non-smooth PID azimuth controller of a small floating antenna was constructed based on the novel non-smooth controller to control the antenna's azimuth. Simulation and part experiment results validate that,the non-smooth PID controller of the small floating satellite antenna can quickly and steadily control the antenna's azimuth,and well reject the disturbances in sea to ensure a communication quality between the antenna and the target satellite.
一种小型漂浮式天线基座静力学特性研究
海青,王渝,方建军,杜明芳
北京理工大学学报 , 2014,
Abstract: 研究了一种新的小型飘浮式卫星天线基座的静力学特性.根据几何尺寸和受力情况研究其浮态、状态方程和储备浮力;根据重心移动定理、浮心移动定理和等体积倾斜定理研究其浮心、稳心、稳性半径和初稳性高;根据几何旋转不变性,通过数学推理研究其静稳性;根据动力矩的作用过程分析动复原力臂和静复原力臂间的关系,研究其大倾角稳性;利用储备浮力研究其抗沉性.研究结果表明该基座具有较好的浮性、稳性和足够的抗沉能力.
高原地区颅内血管密度增高病因分析
成瑛,陈红,马院林,海青
- , 2017, DOI: 10.13609/j.cnki.1000-0313.2017.07.003
Abstract: 【摘要】目的:探索高原地区患者颅脑CT平扫显示血管密度增高的病因,分析其与血红蛋白浓度的相关性。方法:搜集居住在海拔2500~4800m的186例颅内血管密度增高患者的病例资料作为研究组,另选取98例颅脑CT正常的成人为对照组。分析所有患者临床特点,统计各种病因所占比例,比较两组颅内动脉、静脉窦CT值、近期血红蛋白含量的差异并进行统计学分析。结果:186例高原地区颅内血管CT值增高患者中,慢性阻塞性肺病(COPD)134例,占72.0%,慢性高原病(CMS)46例,占24.7%,右向左分流型先天性心脏病(CHD)6例,占3.2%。与对照组相比,研究组血红蛋白含量、脑动脉、静脉窦CT值均增高,差异具有统计学意义(F=720.781、150.952、221.988,P<0.01)。颅内血管密度增高组脑动脉CT值与血红蛋白含量呈正相关(b=0.202、0.271、0.292,P<0.05)。结论:高原地区颅内血管密度增高及程度与血红蛋白含量呈正相关,高原地区引起血红蛋白浓度增高的病变都可能使脑血管密度增高
Optimization of satellite searching strategy of the non-stationary antenna
Optimization of satellite searching strategy of the non-stationary antenna

海青,王渝,姚志英
- , 2015, DOI: 10.15918/j.jbit1004-0579.201524.0318
Abstract: The tiny searching step length and the satellite distribution density are the major factors to influence the efficiency of the satellite finder, so a scientific and reasonable method to calculate the tiny searching step length is proposed to optimize the satellite searching strategy. The pattern clustering and BP neural network are applied to optimize the tiny searching step length. The calculated tiny searching step length is approximately equal to the theoretic value for each satellite. In application, the satellite searching results will be dynamically added to the training samples to re-train the network to improve the generalizability and the precision. Experiments validate that the optimization of the tiny searching step length can avoid the error of locating target satellite and improve the searching efficiency.
The tiny searching step length and the satellite distribution density are the major factors to influence the efficiency of the satellite finder, so a scientific and reasonable method to calculate the tiny searching step length is proposed to optimize the satellite searching strategy. The pattern clustering and BP neural network are applied to optimize the tiny searching step length. The calculated tiny searching step length is approximately equal to the theoretic value for each satellite. In application, the satellite searching results will be dynamically added to the training samples to re-train the network to improve the generalizability and the precision. Experiments validate that the optimization of the tiny searching step length can avoid the error of locating target satellite and improve the searching efficiency.
On a novel non-smooth output feedback controller for the attitude control of a small float satellite antenna
On a novel non-smooth output feedback controller for the attitude control of a small float satellite antenna

海青,王渝,姚志英
- , 2015, DOI: 10.15918/j.jbit1004-0579.201524.0320
Abstract: A novel non-smooth controller of the second order double integrator system with a bounded disturbance is proposed, which stability is proved and which disturbance rejection capability is analyzed by MATLAB simulation experiments. The novel non-smooth output feedback controller and tracking differentiator are applied to control the azimuth servo system of the small floating satellite antenna. The MATLAB simulation and hardware in the loop simulation experiments are conducted. The experiment results validate that the non-smooth output feedback controller with stronger surge and sudden disturbance rejection capability can realize the stable azimuth servo control of the small floating antenna to ensure the communication between the target satellite and the antenna with high quality.
A novel non-smooth controller of the second order double integrator system with a bounded disturbance is proposed, which stability is proved and which disturbance rejection capability is analyzed by MATLAB simulation experiments. The novel non-smooth output feedback controller and tracking differentiator are applied to control the azimuth servo system of the small floating satellite antenna. The MATLAB simulation and hardware in the loop simulation experiments are conducted. The experiment results validate that the non-smooth output feedback controller with stronger surge and sudden disturbance rejection capability can realize the stable azimuth servo control of the small floating antenna to ensure the communication between the target satellite and the antenna with high quality.
Binary Image Processing Algorithm Based on Projection Operator
一种基于投影算子的二值图像处理算法

YAO Zhi-Ying,CAO Hai-Qing,
姚志英
,海青

计算机系统应用 , 2013,
Abstract: The binary image processing is an important tache in the field of image content analysis, which will significantly affect the results of the image processing. In the paper, a new binary image processing algorithm based on projection operator is purposed to deal with the old documents. The rational threshold of binary image is gained through the design and application of projection operator to the gray level image. The border and stain of document can also be automatically detected by the design and application of projection operator to the binary image. It is proved that the binary image process algorithm based on projection operator is a practical and high-efficient method which can decrease time complexity and space complexity greatly.
鱼糜制品凝胶特性研究进展
秦影,欧昌荣,海青,锦轩,陈明辉,高亚文
核农学报 , -1, DOI: 10.11869/j.issn.100-8551.2015.09.1766
Abstract: 鱼糜制品是一种优质、营养、方便的高蛋白食品,是颇具发展前景、广受消费者喜欢的现代水产加工食品。其是由原料鱼经采肉、漂洗、脱水、精滤、擂溃、凝胶化而成的水产加工产品,具有细嫩味美、耐储藏的特点。随着水产加工业的发展,人们对鱼糜制品的质量要求也越来越高。鱼糜凝胶特性是评价鱼糜品质的重要指标,有效改善凝胶特性是目前鱼糜加工过程中的一个焦点问题。本文介绍了鱼糜凝胶的形成过程,影响鱼糜制品凝胶特性的因素以及鱼糜凝胶特性分析方法,旨在为改良鱼糜凝胶特性方面的研究提供参考。
3,5-二硝基水杨酸法测定葡萄酒中总糖含量的条件优化
刘忠义,欧昌荣,海青,锦轩,殷居易
核农学报 , 2013, DOI: 10.11869/hnxb.2013.11.1717
Abstract: 根据3,5-二硝基水杨酸(3,5-dinitrosalicylicacid,DNS)与还原糖共热,可被还原成红棕色氨基化合物的原理,采用比色法测定葡萄酒样品经酸水解后总糖的含量。对水解条件、DNS法反应条件和葡萄酒基质影响等方面进行研究。最终确定葡萄酒样品的水解条件为:水解温度70.0℃,水解时间16.0min,HCl(浓盐酸1:1稀释)添加量6.5mL,DNS比色法测定条件为:吸收波长540nm,显色剂2mL,显色稳定时间30min内,线性范围0.1~2.0g·L-1,样液pH值7.0~13.0。结果表明DNS法操作简便、干扰少,精密度和重复性好(RSD98%,可以作为葡萄酒中总糖测定的方法。
一种小型漂浮式天线横滚角动态处理方法
海青,王渝,姚志英,杜明芳
兵工学报 , 2014, DOI: 10.3969/j.issn.1000-1093.2014.08.018
Abstract: ?研究了一种用于我国近海海域隐蔽式军事侦察的小型漂浮式卫星天线横滚角的动态处理方法。从理论上研究横滚角对天线与卫星通信的影响,以及横滚角变化与方位角和极化角变化的关系;研究通过方位角和极化角的补偿来隔离横滚角变化对通信影响的横滚角动态处理方法;以4级海况下漂浮式天线系统的横滚角度变化情况为测试样例,比较横滚角动态补偿方法和4轴伺服补偿过程中自动增益控制(AGC)的变化情况,证实了横滚角动态处理方法切实可行。
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