检索结果-南通市图书馆

Development and evaluation of a general-purpose electric off-road robot based on agricultural navigation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2014年第5期7卷 14-21页

作者： yin xiang Noboru Noguchi School of Agricultural and Food Engineering Shandong University of TechnologyZibo 255049China Bio-production Engineering Graduate School of AgricultureHokkaido UniversityKita-kuSapporo 060-8589Japan

The aim of this study was to develop a general-purpose electric off-road robot vehicle by using automatic control *** vehicle prototype used in this study was a commercially-purchased electricity utility vehicle that was designed originally for manual operations.A manipulating unit,an automatic steering system and a speed control system were developed and integrated into a CAN-bus network for operating on functions(forward,reverse,park or stop),realizing desired steering angles and maintaining a constant speed,respectively,in the mode of *** autonomous navigation system based on RTK-GPS and IMU was used to evaluate the performance of the newly developed off-road *** tests showed that the maximum error in speed control was 0.29 m/s and 0.22 m/s for speed tests and autonomous runs,*** lateral offset was less than 10 cm in terms of straight paths,indicating that the automatic steering control system was of good performance.

关键词： electric off-road robot automatic control automatic steering speed control autonomous navigation system field test

On K_2-group of a Formal Matrix Ring

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2012年第9期28卷 1897-1906页

作者： Zi Qiang FAN Zhi xiang yin Department of Mathematics Anhui University of Science and Technology

Let S be a formal matrix ring, T the subring consisting of all diagonal elements, I the set consisting of all off-diagonal elements. Then I is a split radical ideal under certain conditions. In this paper, we show tha... 详细信息

关键词： K2 group relative K2 group extension of groups

维普期刊数据库

Recent advances on formal methods for safety and security of cyber-physical systems

在线全文

学校读者我要写书评

暂无评论

Control Theory and Technology 2020年第4期18卷 459-461页

作者： xiang yin Shaoyuan Li Department of Automation Shanghai Jiao Tong UniversityShanghai 200240China Key Laboratory of System Control and Information Processing Ministry of EducationShanghai 200240China

Cyber-physical systems(CPSs)are engineering systems with both computational and physical components[1].Typical CPSs include energy systems,transporation systems,autonomous vchicles,*** are usual hybrid involving complex interactions of continuous dynamics with discrete *** development of cotroller design and verification algorithms for such complex systems are crucial and challenging *** demands for safety and security of CPSs put stringent constraints on their analysis and design,and ncessitat the use of formal model-based *** recent years,we have witnessed a substantial increase in the use of formal techniques for the verifcation and design of safetyritical and security senstve CPSs[2].

关键词： formal CPS autonomous

Dynamic Performance Investigation of A Spar-Type Floating Wind Turbine Under Different Sea Conditions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Ocean Engineering 2018年第3期32卷 256-265页

作者： WANG Han HU Zhi-qiang MENG xiang-yin State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai 200240China School of Engineering Newcastle UniversityNewcastle upon TyneNE1 7RU UK

Both numerical calculation and model test are important techniques to study and forecast the dynamic responses of the floating offshore wind turbine(FOWT). However, both the methods have their own limitations at present. In this study, the dynamic responses of a 5 MW OC3 spar-type floating wind turbine designed for a water depth of 200 m are numerically investigated and validated by a 1:50 scaled model test. Moreover, the discrepancies between the numerical calculations and model tests are obtained and discussed. According to the discussions, it is found that the surge and pitch are coupled with the mooring tensions, but the heave is independent of them. Surge and pitch are mainly induced by wave under wind wave conditions. Wind and current will induce the low-frequency average responses, while wave will induce the fluctuation ranges of the responses. In addition, wave will induce the wavefrequency responses but wind and current will restrain the ranges of the responses.

关键词： spar-type floating wind turbine dynamic response numerical calculation model test time domain analysis frequency domain analysis

维普期刊数据库

A Smallness Condition Ensuring Boundedness in a Two-dimensional Chemotaxis-Navier-Stokes System involving Dirichlet Boundary Conditions for the Signal

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2022年第6期38卷 985-1001页

作者： Yu Lan WANG Michael WINKLER Zhao yin xiang School of Science Xihua UniversityChengdu 610039P.R.China Institut fur Mathematik Universitat Paderborn33098 PaderbornGermany School of Mathematical Sciences University of Electronic Science and Technology of ChinaChengdu 611731P.R.China

The chemotaxis-Navier-Stokes system{nt+u・∇n=Δn−∇・(n∇c),ct+u・∇c=Δc−nc,ut+(u・∇)u=Δu+∇P+n∇φ,∇・u=0is considered in a smoothly bounded planar domainΩunder the boundary conditions(∇n−n∇c)・ν=0,c=c,u=0,x∈∂Ω,t>0,with a given nonnegative constant c_(*).It is shown that if(n_(0),c_(0),u_(0))is sufficiently regular and such that the product||n_(0)||L^(1)(Ω)||c_(0)||^(2)L^(∞)(Ω)is suitably small,an associated initial value problem possesses a bounded classical solution with(n,c,u)|_(t=0)=(n_(0),c_(0),u_(0)).

关键词： Chemotaxis Navier-Stokes system Dirichlet boundary condition

维普期刊数据库

VAECGAN:a generating framework for long-term prediction in multivariate time series

在线全文

学校读者我要写书评

暂无评论

Cybersecurity 2021年第1期4卷 337-348页

作者： xiang yin Yanni Han Zhen Xu Jie Liu Institute of Information Engineering Chinese Academy of SciencesSchool of Cyber SecurityUniversity of Chinese Academy of SciencesBeijingChina Institute of Information Engineering Chinese Academy of SciencesBeijingChina Network information department China Mobile Communications Group Co.LtdBeijingChina

Long-term prediction is still a difficult problem in data *** usually use various kinds of methods of Recurrent Neural Network to ***,with the increase of the prediction step,the accuracy of prediction decreases *** order to improve the accuracy of long-term prediction,we propose a framework Variational Auto-Encoder Conditional Generative Adversarial Network(VAECGAN).Our model is divided into three *** first part is the encoder net,which can encode the exogenous sequence into latent space vectors and fully save the information carried by the exogenous *** second part is the generator net which is responsible for generating prediction *** the third part,the discriminator net is used to classify and feedback,adjust data generation and improve prediction ***,extensive empirical studies tested with five real-world datasets(NASDAQ,SML,Energy,EEG,KDDCUP)demonstrate the effectiveness and robustness of our proposed approach.

关键词： Long-term prediction Multivariate time series Attention mechanism Generating framework

Design and dynamic analysis of a novel scroll compressor-expander unit for the CO2 air conditioning system in electric vehicles

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Technological Sciences 2024年第12期67卷 3659-3672页

作者： HU HaoYu YANG Xu CAO Feng yin xiang SONG YuLong School of Energy and Power Engineering Xi'an Jiaotong University

Transcritical CO2refrigeration cycle systems hold significant promise for improving the energy efficiency of air conditioning system in vehicles, diminishing reliance on traditional energy sources, and reducing environmental impact. Utilizing a scroll compressor-expander unit（SCEU） to recover energy during the expansion process enables the effective conversion of expansion work into useful work, thereby enhancing the efficiency of the entire refrigeration cycle. This paper provides a detailed description of the geometric structure of the SCEU, and based on this, conducts an exhaustive mechanical analysis of its orbiting scrolls and main shaft, thus establishing dynamic models. Computational results indicate that in transcritical CO2refrigeration systems, the SCEU aids in recovering expansion work, increasing the coefficient of performance（COP） by 8.2% under standard operating condition. Additionally, this paper pioneers in studying the dynamic characteristics of SCEU under variable *** is found that although the COP of the systems decreases with the rise of working pressure, compared to traditional systems, its rate of improvement progressively increases. Under conditions of negligible leakage and an isentropic efficiency of 60%, the SCEU can potentially increase the COP of the system by up to 9.8%.

关键词： transcritical CO2 refrigeration cycle systems air conditioning system in vehicles scroll compressor-expander unit dynamic models

Dynamic Alignment of D2 Enhanced by Two Few-cycle Pulses

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2008年第5期21卷 421-426页

作者： Zeng-qiang Yang Zhi-rong Guo Bao-xiang yin Mao-zhu Sun Key Laboratory of Ecophysics and Department of Physics Normal College Shihezi University Shihezi832003 China

Dynamic alignment of D2 induced by two few-cycle pulses was investigated by solving the time-dependent Schr6dinger equation numerically based on a rigid rotor model. The results show that alignment of D2 can be enhanced by two few-cycle pulses compared with the level achievable by a single few-cycle pulse as long as the time delay between two pulses is chosen properly, and the pulse duration of two lasers plays an important role in the aligning process of D2 molecules.

关键词： Dynamic alignment Few-cycle pulses Pulse duration

Molecular phylogeny of Pamphagidae （Acridoidea, Orthoptera） from China based on mitochondrial cytochrome oxidase II sequences

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Insect Science 2011年第2期18卷 234-244页

作者： Dao-Chuan Zhang Hong-Yan Han Hong yin Xin-Jiang Li Zhan yin xiang-Chu yin College of Life Sciences Hebei University Baoding Hebei Province College of Plant Protection Shandong Agncultural University Taian Shandong Province China

Phylogenetic relationships of Pamphagidae were examined using cytochrome oxidase subunit II （COIl） mtDNA sequences （684 bp）. Twenty-seven species of Acridoidea from 20 genera were sequenced to obtain mtDNA data, along with four species from the GenBank nucleotide database. The purpose of this study was analyzing the phylogenetic relationships among subfamilies within Pamphagidae and interpreting the phylogenetic position of this family within the Acridoidea superfamily. Phylogenetic trees were reconstructed using neighbor-joining （NJ）, maximurn parsimony （MP） and Bayesian inference （BI） methods. The 684 bp analyzed fragment included 126 parsimony informative sites. Sequences diverged 1.0%-11.1% between genera within subfamilies, and 8.8%-12.3% between subfamilies. Amino acid sequence diverged 0-6.1% between genera within subfamilies, and 0.4%-7.5% between subfamilies. Our phylogenetic trees revealed the monophyly of Pamphagidae and three distinct major groups within this family. Moreover, several well supported and stable clades were found in Pamphagidae. The global clustering results were similar to that obtained through classical morphological classification： Prionotropisinae, Thrinchinae and Pamphaginae were monophyletic groups. However, the current genus Filchnerella （Prionotropisinae） was not a monophyletic group and the genus Asiotmethis （Prionotropisinae） was a sister group of the genus Thrinchus （Thrinchinae）. Further molec- ular and morphological studies are required to clarify the phylogenetic relationships of the genera Filchnerella and Asiotmethis.

关键词： Acridoidea cytochrome oxidase II gene molecular phylogeny mtDNA,Pamphagidae subfamily