检索结果-南通市图书馆

Trajectory-tracking controller for vehicles on inclined road based onUdwadia–Kalaba equation

在线全文

学校读者我要写书评

暂无评论

Green Energy and Intelligent Transportation 2022年第3期1卷 28-37页

作者： Xingyu Li Xinle Gong Jin Huang ye-Hwa Chen School of Vehicle and Mobility Tsinghua UniversityBeijing100084China The George W.Woodruff School of Mechanical Engineering Georgia Institute of TechnologyAtlantaGA30332-0405USA

Vehicle lateral control is an important subtask of vehicle autonomous *** are many external disturbances that will affect the lateral control accuracy of the vehicle,and the inclination of the road is one of the most important *** inclined road will lead to additional lateral forces on the vehicle and will also change the magnitude of support force on the *** change of lateral force and support force will ultimately affect the trajectory tracking performance of the *** of the current trajectory tracking methods only consider the trajectory tracking problem on the *** the influence of the road surface is considered in the design of the vehicle's trajectory tracking controller,the dynamic response and the tracking accuracy of the vehicle can be *** paper proposes a method based on Udwadia–Kalaba equation to calculate the normal and lateral force on a vehicle tracking a desired trajectory on an inclined ***,a trajectory tracking controller that considers the road inclination is ***,the simulation of trajectory tracking performance with an inclination angle is carried out to verify the effectiveness of the proposed controller.

关键词： Trajectory-tracking Constraint-following Udwadia-kalaba equation Equation constraint

Receiver-Controlled Multi-Node Cooperation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Harbin Institute of Technology(New Series) 2014年第2期21卷 6-12页

作者： Liang ye Yue Li Xue-Jun Sha Esko Alasaarela Communication Research Center Harbin Institute of Technology Dept. of Electrical Engineering University of Oulu

Since wireless links in Ad hoc networks are more fragile than those in traditional wireless networks due to route flapping,multi-node cooperation plays an important role in ensuring the quality of service( QoS). Based on the authors' previous work,this paper proposes a receiver-controlled multi-node cooperation routing protocol,known as AODV-RCC. In this protocol,nodes form a cooperation group based on signal power. In a cooperation group,signal power between a partner and a transmitter,as well as signal power between the partner and the receiver,must be larger than the signal power between the transmitter and the receiver. Otherwise,the transmission will not benefit from cooperation. To avoid collision or congestion,each cooperation group only contains one partner. This partner offers both data and ACK cooperative retransmission. Its retransmission time should be shorter than the internal retry time of the transmitter's MAC layer,because it is better for the partner to retransmit firstly,as it offers a more reliable cooperative link. In AODV-RCC,it is the receiver that chooses the partner,because the link between the partner and the receiver is the most important. According to our simulation results,AODV-RCC shortens the end-to-end delay and increases the packet delivery ratio.

关键词： multi-node cooperation receiver-controlled routing protocol Ad hoc network

Using a Two-Liquid-Phase System to Investigate the Biodegradation of Trichlorobenzenes

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2015年第2期25卷 169-176页

作者： SONG Yang WANG Fang BIAN Yong-Rong ye Mao JIANG Xin State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of Sciences

Due to easy volatilization of volatile organic compounds from water,it is difficult to monitor their aerobic biodegradation in the traditional single water *** a two-liquid-phase system(TLPS) could overcome this obstacle and enhance the degradation of volatile contaminants? In this study,a TLPS composed of silicone oil and water was employed to investigate the biodegradation of volatile compounds,trichlorobenzenes(TCBs),by the adapted microorganisms in an activated *** degradation and volatilization of TCBs in TLPS and in a single water system were *** results showed that due to volatilization losses of TCBs,the mass balance of TCBs in a single water system was very *** contrast,using TLPS could effectively inhibit the volatilization losses of TCBs and achieved a very good mass balance during the biodegradation ***,the TLPS could increase microbial activity and microbial growth during the degradation *** TLPS,the TCB degradation was in descending order of 1,2,4-TCB> 1,2,3-TCB>> 1,3,5-TCB,which was related to the exposed concentration of the contaminants in *** study showed that TLPS could be employed as an effective tool to evaluate the biodegradation of volatile hydrophobic organic compounds,which could not be achieved with the traditional single water system.

关键词： activated soil degradation silicone oil volatile organic compound volatilization

在线全文

学校读者我要写书评

暂无评论

内填料石钢管混凝土中长柱轴压性能试验研究

建筑结构学报 2023年第2期44卷 27-36页

作者：谢菁叶勇刘阳明皓任彧华侨大学土木工程学院福建厦门361021 华侨大学福建省结构工程与防灾重点实验室福建厦门361021 福建建工集团有限责任公司福建福州350001

为研究内填料石钢管混凝土(SCFST)中长柱的轴压性能,对12根内填料石钢管混凝土中长柱进行单调轴压试验,研究内填料石尺寸、钢管壁厚和长细比对SCFST中长柱受力性能的影响。试验结果表明:内置料石提高了SCFST中长柱的承载力,且增幅随料... 详细信息

为研究内填料石钢管混凝土(SCFST)中长柱的轴压性能,对12根内填料石钢管混凝土中长柱进行单调轴压试验,研究内填料石尺寸、钢管壁厚和长细比对SCFST中长柱受力性能的影响。试验结果表明:内置料石提高了SCFST中长柱的承载力,且增幅随料石尺寸的增大而提高,最大增幅达87%;内填料石尺寸相同时,SCFST中长柱承载力随钢管壁厚的增大近似呈线性增长;随着长细比的增大,SCFST中长柱破坏形态逐渐从轴压破坏转变为压弯破坏,承载力逐渐降低。根据试验结果,对GB 50396—2014中CFST柱相关设计模型用于预测SCFST中长柱承载力的可行性进行评估,预测结果与试验结果误差为-18%~24%,不能较好预测SCFST中长柱的承载力。

关键词：内填料石钢管混凝土中长柱轴压试验轴压性能承载力

同方期刊数据库

Frozen curtain characteristics during excavation of submerged shallow tunnel using Freeze-Sealing Pipe-Roof method

在线全文

学校读者我要写书评

暂无评论

Research in Cold and Arid Regions 2022年第4期14卷 267-273页

作者： ye Niu ZeQun Hong Jun Zhang Lei Han China Railway Siyuan Survey and Design Group Co. Ltd.WuhanHubei430056China School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhouJiangsu221116China CCCC Second Highway Consultants Co. Ltd.WuhanHubei430056China Department of Geotechnical Engineering Tongji UniversityShanghai200092China

The Freeze-Sealing Pipe-Roof(FSPR)method,which has been applied for the first time in the Gongbei Tunnel of the Hong Kong-Zhuhai-Macao Bridge,is a new approach of tunnel pre-support that allows flexible adjustment of freeze tube arrangement and can be adapted to different environmental *** the FSPR method is used to construct shallow burial submerged tunnels,the frozen wall to hold back groundwater during excavation will be weakened by air and water flows inside and outside the tunnel,and its waterproof performance needs to be further *** this paper,a two-dimensional numerical model of the temperature field considering excavation and moving water boundary is established based on the preliminary design scheme and in-situ conditions and is used to analyze the variation in frozen curtain properties with various active freezing times during *** results show that excavation has a weakening effect on both sides of the frozen wall,with a greater effect on the inner side,and a positive temperature appears in the local area inside the jacked *** concrete fill in the jacked pipe obviously improves the freezing efficiency,and the tunnel excavation after 60 days of active freezing in the interval filling mode can ensure that the frozen soil thickness at the thinnest segment exceeds 2 m,i.e.,the design *** practice,the active freezing time can be extended appropriately to reduce the influence of river water flow above the *** study serves as a technical reference for the design and implementation of similar projects.

关键词： Freeze-sealing pipe-roof method Submerged tunnel Soil excavation Temperature field Frozen wall thickness

Postoperative multidrug-resistant Acinetobacter baumannii meningitis successfully treated with intravenous doxycycline and intraventricular gentamicin: A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2019年第24期7卷 4342-4348页

作者： Xia Wu Lu Wang Ying-Zi ye Hui Yu Department of Infectious Diseases Children’s Hospital of Fudan UniversityShanghai 201102China Department of General Medicine Children’s Hospital of Fudan UniversityShanghai 201102China

BACKGROUND Multidrug-resistant Acinetobacter baumannii(MDRAB) has emerged as an increasingly important pathogen that causes nosocomial meningitis. However,MDRAB-associated nosocomial meningitis is rarely reported in *** SUMMARY We report the case of a 1-year-old girl with a choroid plexus papilloma, who developed postoperative nosocomial meningitis due to MDRAB. The bacterial strain was sensitive only to tigecycline and colistin, and showed varying degrees of resistance to penicillin, amikacin, ceftriaxone, cefixime, cefotaxime,ciprofloxacin, levofloxacin, gentamicin, meropenem, imipenem, and *** was cured with intravenous doxycycline and intraventricular gentamicin *** Doxycycline and gentamicin were shown to be effective and safe in the treatment of a pediatric case of MDRAB meningitis.

关键词： Acinetobacter baumannii Meningitis Doxycycline Gentamicin Multidrug resistance Case report

High-order time-reversal symmetry breaking normal state

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(Physics,Mechanics & Astronomy) 2024年第3期67卷 136-148页

作者： Meng Zeng Lun-Hui Hu Hong-ye Hu Yi-Zhuang You Congjun Wu Department of Physics University of CaliforniaSan DiegoCalifornia 92093USA Department of Physics Zhejiang UniversityHangzhou 310058China New Cornerstone Science Laboratory Department of PhysicsSchoolof ScienceWestlake UniversityHangzhou 30024China Institute for Theoretical Sciences Westlake UniversityHangzhou 310024China Key Laboratory for Quantum Materials of Zhejiang Province School of ScienceWestlake UniversityHangzhou 310024China Institute of Natural Sciences Westlake Institute for Advanced StudyHangzhou 310024China

Spontaneous time-reversal symmetry breaking plays an important role in studying strongly correlated unconventional *** two superconducting gap functions with different symmetries compete,the relative phase channel(θ_(-)≡θ_(1)-θ_(2))exhibits an Ising-type Z_(2) symmetry due to the second order Josephson coupling,where θ_(1,2) are the phases of two gap *** contrast,the U(1) symmetry in the channel of θ_(+)≡(θ_(1)+θ_(2))/2 is *** phase locking,i.e.,ordering of θ_(-),can take place in the phase fluctuation regime before the onset of superconductivity,i.e.,when θ_(+) is *** θ_(-) is pinned at ±π/2,then timereversal symmetry is broken in the normal state,otherwise,if θ_(-)=0,or,π,rotational symmetry is broken,leading to a nematic normal *** both cases,the order parameters possess a 4-fermion structure beyond the scope of mean-field theory,which can be viewed as a high order symmetry *** employ an effective two-component XY-model assisted by a renormalization group analysis to address this *** a natural by-product,we also find the other interesting intermediate phase corresponds to ordering of θ_+ but with θ_(-)*** is the quartetting,or,charge-4e,superconductivity,which occurs above the low temperature Z_(2)-breaking charge-2e superconducting *** results provide useful guidance for studying novel symmetry breaking phases in strongly correlated superconductors.

关键词： superconductivity strong correlation time-reversal breaking charge-4e

A CCAAT-binding factor,SlNFYA10,negatively regulates ascorbate accumulation by modulating the D-mannose/L-galactose pathway in tomato

在线全文

学校读者我要写书评

暂无评论

Horticulture Research 2020年第1期7卷 141-152页

作者： Weifang Chen Tixu Hu Jie ye Bing Wang Genzhong Liu Ying Wang Lei Yuan Jiaming Li Fangman Li Zhibiao ye Yuyang Zhang Key Laboratory of Horticultural Plant Biology Ministry of EducationHuazhong Agricultural University430070 WuhanChina HZAU Chuwei Institute of Advanced Seeds 430070 WuhanChina

Ascorbic acid(AsA),an important antioxidant and growth regulator,and it is essential for plant development and human ***,humans have to acquire AsA from dietary sources due to their inability to synthesize *** AsA biosynthesis pathway in plants has been elucidated,but its regulatory mechanism remains largely *** this report,we biochemically identified a CCAAT-box transcription factor(SlNFYA10)that can bind to the promoter of SlGME1,which encodes GDP-Man-3’,5’-epimerase,a pivotal enzyme in the D-mannose/L-galactose ***,SlNFYA10 simultaneously binds to the promoter of SlGGP1,a downstream gene of SlGME1 in the Dmannose/L-galactose *** assays in yeast and functional analyses in plants have confirmed that SlNFYA10 exerts a negative effect on the expression of both SlGME1 and *** tomato lines overexpressing SlNFYA10 show decreased levels of SlGME1 and SlGGP1 abundance and AsA concentration in their leaves and fruits,accompanied by enhanced sensitivity to oxidative ***,SlNFYA10 is the first CCAAT-binding factor identified to date to negatively regulate the AsA biosynthetic pathway at multiple sites and modulate plant responses to oxidative stress.

关键词： dietary oxidative expressing

Optical length-change measurement based on an incoherent single-bandpass microwave photonic filter with high resolution

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonics Research 2014年第4期2卷 35-39页

作者： ye Deng Ming Li Ningbo Huang Hui Wang Ninghua Zhu State Key Laboratory on Integrated Optoelectronics Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China

An optical length-change measurement technique is proposed based on an incoherent microwave photonic filter(MPF).The optical length under testing is inserted into an optical link of a single-bandpass MPF based on a polarization-processed incoherent light *** key feature of the proposed technique is to transfer the length measurement in the optical domain to the electrical *** the electrical domain,the measurement resolution is extremely high thanks to the high-resolution measurement of microwave frequency *** addition,since the MPF is a single-bandpass MPF,the optical length is uniquely determined by the central frequency of the MPF.A detailed investigation of the relation between the center frequency of the MPF and the optical length change is implemented.A measurement experiment is also demonstrated,and the experimental results show that the proposed technique has a measurement sensitivity of 1 GHz/mm with a high length-measurement resolution of 1 pm in *** proposed approach has the advantages of high sensitivity,high resolution,and immunity to power variation in electronic and optical links.

关键词： filter polarization microwave