检索结果-南通市图书馆

第24届中国控制与决策会议

作者： Zhenyan Wang 1,2 , Zhen Zhang 1 , Jianqin Mao 1 , Kemin Zhou 3.1.School of Automation Science and electrical engineering, beijing {3. of Aeronautics and Astronautics, beijing 100191,china 2. School of Electronical and information engineering, Taiyuan {3. of Science and Technology, Taiyuan, 03.024, china 3. School of electrical engineering, Southwest Jiaotong {3., Chengdu, 61003., china

Most smart materials used in engineering applications have rate-dependent hysteresis nonlinearity. In this paper, a Hammerstein-based model is proposed to describe the dynamic characteristics of rate-dependent hysteresis in piezoelectric actuator. A Bouc-Wen model is used to approximate the static nonlinear characteristic while a linear dynamic model is constructed to capture the rate-dependent property of the hysteresis. Firstly, Bouc-Wen model parameters are optimized with particle swarm optimization （PSO） algorithm to model the static hysteresis nonlinearity. Based on this constructed static hysteresis nonlinear model, a recursive least squares （RLS） algorithm is utilized to identify the dynamic linear model parameters of Hammerstein model according to the input-output data with rich frequency information. Finally, the experimental results of applying the proposed method to the modeling of rate-dependent hysteresis in a piezoelectric actuator are presented with a 100Hz sinusoidal scanning signal. The model generation capability is verified in the given frequency range from 1Hz to100Hz when the excitation voltage are 40V, 80V, 120V, respectively.

关键词： Hammerstein Bouc-Wen Rate-dependent Piezoelectric actuator

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Studies on Parameters of Loin-Eye Muscle of Hogs Carcass Using Image Processing Technology

Studies on Parameters of Loin-Eye Muscle of Hogs Carcass Usi...

引用

2005年中国农业工程学会学术年会

作者： Zheng Limin1 Yubo1 Ren Fazheng 2* Zhu Hong Tian Li Jun (1 College of information & electrical engineering 2College of Food Science & Nutritional engineering, china agricultural university, beijing china,100083)

Area and fat content of loin-eye muscle, marbling and color of pork are important parameters of pork quality. The digital camera was adopted in this study to obtain the loin-eye muscle image of 3. hug

关键词： image processing technology area of loin-eye muscle features of color and texture region-growing

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

The Application of Delay Control Theory in Electric Power Transmission System

The Application of Delay Control Theory in Electric Power Tr...

引用

第24届中国控制与决策会议

作者： Hao Zhihong 1 , Liang Jiankun 2 , Ren Yan 3.4 1. Faculty of engineering, The Open university of china, {3. 10003., china2. Computer Center, Shenyang Pharmacological university, Shenyang 110016, china 3. School of Automation Science and electrical engineering, Beihang university, {3. 100191, china 4. information engineering School, Inner Mongolia Science and Technology university, Baotou 014010, china

For long distance electric power transmission system, the neutral delay system model of current and voltage on lossless and even transmission line were established, on this basis a new control strategy of power transmission system based on the linear semigroup spectral decomposition method was proposed, simulation results show that the effectiveness of the proposed method. By this proposed method the combination of delay control theory and electrical engineering was achieved, and it has promotional value.

关键词： Long Distance Electric Power Transmission Lossless Transmission Model of Neutral Delay System Spectral Decomposition

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Propagation Characteristics of 2.4GHz Wireless Channel in Cornfields

Propagation Characteristics of 2.4GHz Wireless Channel in Co...

引用

2011 IEEE 13.h International Conference on Communication Technology(ICCT 2011)

作者： Siyu Li Hongju Gao Key Laboratory of Modern Precision Agriculture System Integration Research Ministry of Education College of information and electrical engineering {3. beijing 100083

Researches on propagation characteristics of wireless channel in cropland environments will lay the foundation for network deployments of wireless sensor network （WSN） for agricultural information *** this study,cropland with corn in maturity stage was selected as the representative of worst-case scenarios for radio propagation within cropland,and the propagation mechanisms and the impact factors on the propagation characteristics of wireless channel in this environment were *** addition,the power strength Radio Signal Strength Indicator （RSSI） and Packet Loss Rate （PLR） were measured in cornfields,and the node’s coverage was further *** experimental results were analyzed to provide the guidance and suggestion for the WSN *** the engineering practice,the nodes shall be placed in open area such as wide walkways when it is possible in order to minimize propagation loss and increase the node’s coverage *** the antenna height of 1.4m to 1.6m is a good option,which will be more economic and ***,experimental results also verified that rainfall doesn’t have much effect on the propagation of 2.4GHz wireless *** although raising the transmitted power can increase the transmission range significantly,both the power usage of battery and the radio surveillance regulations have to be taken into account.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

The linear motor control based on ELVIS

The linear motor control based on ELVIS

引用

第24届中国控制与决策会议

作者： Su Ang 1 , Cao Rongmin 1 , Zhou Huixing 2 1. School of Automation, beijing information Science &Technology university, beijing 100192 china2. School of Industry , china agricultural university, beijing 100083.china

In this paper, we firstly introduce ELVIS and linear motor, and then make two experiments, including tracking the sine curve and inverted pendulum. The paper shows the combination between ELVIS and linear motor. It takes advantages of ELVIS and LabVIEW. The PID control is used in the tracking sine curve, and the cascade PID control is used in the inverted pendulum. And we can achieve the satisfying result.

关键词： ELVIS linear motor PID control

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Guest Editorial for Special Issue on Human-centered Intelligent Robots:Issues and Challenges

引用

IEEE/CAA Journal of Automatica Sinica 2017年第4期4卷 599-601页

作者： Zhijun Li C.L.Philip Chen Wei He IEEE College of Automation Science and engineering South China University of Technology Department of Computer and information Science Faculty of Science and Technology University of Macao School of Automation and electrical engineering University of Science and Technology Beijing

The special issue aims to address a broad spectrum of topics ranging from human-centered intelligent robots acting as a servant,secretary,or companion to intelligent robotic *** special issue publishes original papers of innovative ideas and concepts,new discoveries,and novel applications and business models relevant to the field of human-centered intelligent *** this special issue,modeling,intelligent control,

关键词： In Guest Editorial for Special Issue on Human-centered Intelligent Robots:Issues and Challenges

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A MODEL TO PREDICT SHELF-LIFE LOSS OF HORTICULTURAL PRODUCE DURING DISTRIBUTION WITH FLUCTUATED TEMPERATURE AND VEHICLE VIBRATION

A MODEL TO PREDICT SHELF-LIFE LOSS OF HORTICULTURAL PRODUCE ...

引用

The Second IFIP International Conference on Computer and Computing Technologies in Agriculture (CCTA2008)

作者： Weiwei Gong1 Daoliang Li2 Xue Liu2 Jun Yue 2 3.Zetian Fu 1 * 1 College of Economics and Management china Agriculture university beijing P. R. china 100083 2 College of information and electrical engineering china Agriculture university beijing P. R. china 100083 3.College of Management Ludong university Yantai Shandong Province P. R. china 264025

Fresh fruits and vegetables has become a public concern from the food security aspect. And the prediction of shelf-life loss under the fluctuated temperature becomes one of the key problems in food supply chain operation. So this paper identifies the impact aspects of produce decaying during distribution. For the key temperature factor, the process is divided into three phases: sorting, traveling and door-opening. Based on time-temperature function, a model of shelf-life loss of horticultural produce during distribution is developed by evaluating respiration rate of vegetables and fruits considering both the environment fluctuated temperature and vehicle vibration during traveling. Taking eggplant as an example, the numerical experiment result demonstrates that the average cost for ambient distribution is 2.8 times of the insulation way.

关键词： shelf-life horticultural produce distribution respiration rate

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Using hyperspectral indices to estimate foliar chlorophyll a concentrations of winter wheat under yellow rust stress

Using hyperspectral indices to estimate foliar chlorophyll a...

引用

The First International Conference on Computers and Computing Technologies in Agriculture

作者： LI JING~(1,2) JIANG JINBAO~1 CHEN YUNHAO~(1,2,*) WANG YUANYUAN~1 SU WEI~3.HUANG WENJIANG~4 1 College of Resources Science and Technology beijing Normal university No.19 Xinjiekouwai Street beijing 100875,{3. 2 State Key Laboratory of Earth Surface Processes and Resource Ecology beijing Normal university No.19 Xinjiekouwai Street beijing 100875,{3. 3.College of information & electrical engineering china agricultural university beijing 100083.china 4 National engineering Research Center for information Technology in Agriculture beijing 100089,{3.

The canopy hyperspectral reflectance of winter wheat infected with yellow rust at different levels of severity were measured by an ASD FieldSpec Pro FR spectrometer in the field and the concentrations of chlorophyll a(Chl a) in the leaves corresponding to the spectra were determined by biochemical methods in the *** analyses were made between Chl a concentrations and canopy hyperspectral data of diseased wheat. Results show that foliar Chl a concentrations are strongly correlated with canopy spectrum in the visible region and the first-order derivative spectrum in blue edge,green edge,and red *** and nonlinear models for estimating Chl a concentrations of the diseased wheat were built based on several spectral *** indicate that SDr/SDg,in which SDr and SDg are the sums of the first derivative within red and green edges,outperformed the other indices in predicting Chl a *** relative estimation errors for Chl a for 12 unseen samples are 17.5%.It is concluded that derivative spectra in red edge and green edge have strong prediction power for foliar Chl a concentrations of diseased winter *** hyperspectral remote sensing data to monitor crop disease and nutrition status is very promising.

关键词： chlorophyllα estimation models hyperspectral wheat yellow rust stress

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Design and Implementation of an Integrated Office Automation/Geographic information System Rural E-government System

Design and Implementation of an Integrated Office Automation...

引用

亚洲精细农业与计算机农业应用联合大会

作者： WANG Jianlun 1 DONG Jinyong 1 LI Lin 1 WANG Yongbin 1 1. College of information and electrical engineering {3. beijing P. R. china 100083

This paper designed a synthesized rural E-government system for use at the municipal to village levels. All the everyday information management functions are included in the system, such as social and public affairs, resources, financial transactions and so on. Because of the integration of office automation and geographical information system, the system can query the information in detail and provide an easy-to-use management platform for data management and external publicity. The three-tier software structure and some unique design skills are used in the system to improve the development efficiency and the system robustness.

关键词： Rural E-government Office automation Geographical information system Software design Three-tier structure

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

A Classification of 45 Maize Inbred Lines Used in china with RFLP Markers

引用

agricultural Sciences in china 2002年第2期1卷 143-148页

作者： HUANG Yi-qin and LI Jian-sheng( National Key Lab of Crop Genetic Improvement, Huazhong agricultural university , Wuhan 43.070 National Maize Improvement Center of china , {3., beijing 100094) National Key Lab of Crop Genetic Improvement Huazhong Agricultural University Wuhan 430070 National Key Lab of Crop Genetic Improvement Huazhong Agricultural University Wuhan 430070 National Maize Improvement Center of china China Agricultural University Beijing 100094

The classification of heterotic groups is essential to maize breeding because knowledge of heterotic groups could be interest to both the combination of outstanding hybrids and the improvement of elite inbred lines. RFLP has provided a powerful tool to assign maize inbred lines into heterotic groups. In this investigation, 45 inbred lines, used widely in south and southwest china, were chosen for RFLP analysis, among which 4 lines came from American, representing different heterotic groups in U.S. corn belt. 54 RFLP core markers covering 10 chromosomes of maize were used. A total DNA of each sample was digested with EcoR I, BamH I and Hind 1. The procedure of RFLP was employed as described by a manual from maize RFLP lab at university of Missouri, Columbia. A total of 860 bands were detected among 45 inbred lines based on RFLP analysis, which were involved in 212 loci. Alleles at each locus ranged from 2 to 9 with an average of 4.06. In total, The 45 inbred lines were classified into 6 heterotic groups according to RFLP data with Ward's method. 3.heterotic groups, including Mol7, B73.and Oh43.respectively, seemed to be the same to U. S. heterotic groups. 21 inbred lines, most of which derived from Chinese local germplasm, were classified together into two heterotic groups, indicating domistic germplasm was different from U. S. germplasm at the molecular level and played an important role in maize hybrid production in china. Two inbred lines from tropic germplasm were assigned in the same group. These results provided useful {3. for our understanding maize heterotic groups and heterotic patterns in china.

关键词： Maize germplasm RFLP marker Heterotic groups

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：