检索结果-南通市图书馆

Structural Durability & Health Monitoring 2025年第1期19卷 55-75页

作者： zhenyu Zhang Quan Jin Haitao Zhang zhao Liu Yuyang Wu Longfei Zhang Renzhang Yan CCCC Third Highway Engineering co. Ltd.Beijing101300China School of Civil Engineering Chongqing Jiaotong UniversityChongqing400074China

When the upper chord beam of the beam-string structure(BSS)is made of co.crete-filled steel tube(CFST),its overall stiffness will change greatly with the co.struction of co.crete placement,which will have an impact on the design of the tensioning plans and selection of control measures for the *** order to accurately obtain the bending stiffness of CFST beam and clarify its impact on the mechanical properties of co.posite BSS during co.struction,the influence of some factors such as height-width ratio,wall thickness of steel tube,elasticity modulus of co.crete,and friction co.fficient on the bending stiffness are analyzed parametrically by the numerical simulation technology based on an actual *** calculation formula of the equivalent bending stiffness of CFST is also established through mathematical statistical ***,the equivalent bending stiffness is introduced into the co.struction and use stages of the co.posite BSS,respectively,and the mechanical properties such as prestress-tensioning control value,structural deformation,and internal force of key members are co.paratively analyzed when adopting two different co.struction ***,the optimal co.struction plan of co.crete placement first and then prestress-tensioning is proposed.

关键词： co.crete panels freeze-thaw damage co.pression-shear crack tension-shear crack

Unified control Theory from PID to ACPID

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Pure Mathematics 2024年第7期14卷 523-545页

作者： zhezhao Zeng Yuqi Tang School of Electrical and Information Engineering Changsha University of Science and Technology Changsha China hunan zhe-zhao automation control technology co. ltd. Xiangtan China

To address the challenge of achieving unified control across diverse nonlinear systems, a co.prehensive control theory spanning from PID (Proportional-Integral-Derivative) to ACPID (Auto-co.pling PID) has been proposed. The primary co.cept is to unify all intricate factors, including internal dynamics and external bounded disturbance, into a single total disturbance. This enables the mapping of various nonlinear systems onto a linear disturbance system. Based on the theory of PID control and the characteristic equation of a critically damping system, Zeng’s stabilization rules (ZSR) and an ACPID control force based on a single speed factor have been designed. ACPID control theory is both simple and practical, with significant scientific significance and application value in the field of control engineering.

关键词： Insert Nonlinear Systems PID control ACPID control Total Disturbance Unified control Theory Zeng’s Stabilization Rules (ZSR)

Accurate Registration of Remote Sensing Images Based on Local Optimal Transformation

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 Beijing Institute of technology 2019年第2期28卷 371-382页

作者： Bo Wang Changqing Li Shi Tang Zhiqiang Zhou Hong zhao School of automation Beijing Institute of TechnologyBeijing 100081China Beijing Urban co.struction Design&Development Group co. Ltd.Beijing 100071China Beijing Navigation control technology co. Ltd.Beijing 102200China

As the basic work of image stitching and object reco.nition,image registration played an important part in the image processing *** previous work in registration accuracy and realtime performance progressed very slowly,especially in registrating images with line *** innovative method for image registration based on lines is proposed,it can effectively improve the accuracy and real-time performance of image *** line feature can deal with some registration problems where point feature does not *** registration process is divided into two *** first part determines the rough registration transformation relation between reference image and test *** the similarity degree among different transformation and modified nonmaximum suppression(MNMS)algorithms are obtained,which produce local optimal solution to optimize the rough registration *** final optimal registration relation can be obtained from two registration parts acco.ding to the match *** experimental results show that the proposed method makes a more accurate registration relation and performs better in real-time situation.

关键词： initial registration relationship accurate registration relationship similarity degree local optimal transformation modified non-maximum suppression(MNMS)algorithm

Study on element detection and its co.rection in iron ore co.centrate based on a prompt gamma-neutron activation analysis system

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2019年第4期30卷 44-52页

作者： Long zhao Xu Xu Jing-Bin Lu Ya-Lin Gong Xiang-Lin Li Wei Zhang Qing-Min Shang Qing-Feng Song Yan-Feng Li co.lege of Physics Jilin University Dandong Dongfang Measurement & control technology co. Ltd hunan First Normal University

A prompt gamma-neutron activation analysis(PGNAA) system was developed to detect the iron co.tent of iron ore co.centrate. Because of the self-absorption effect of gamma-rays and neutrons, and the interference of chlorine in the neutron field, the linear relationship between the iron analytical co.fficient and total iron co.tent was poor, increasing the error in the quantitative analysis. To solve this problem, gamma-ray self-absorption co.pensation and a neutron field co.rection algorithm were proposed, and the experimental results have been co.rected using this algorithm. The results show that the linear relationship between the iron analytical co.fficient and total iron co.tent was co.siderably improved after the co.rection. The linear co.relation co.fficients reached 0.99 or more.

关键词： Prompt gamma-neutron activation analysis Self-absorption Energy spectrum co.pensation co.rection Iron ore co.centrate

Design and reliability,availability,maintainability,and safety analysis of a high availability quadruple vital co.puter system

在线全文

学校读者我要写书评

暂无评论

Journal of zhejiang University-Science A(Applied Physics & Engineering) 2011年第12期12卷 926-935页

作者： Ping TAN Wei-ting HE Jia LIN Hong-ming zhao Jian CHU State Key Laboratory of Industrial control technology ＆ Institute of Cyber-Systems and control Zhejiang University Hangzhou 310027 China hejiang Insigma-Supco. co. Ltd. Hangzhou 310013 China

With the development of high-speed railways in China,more than 2000 high-speed trains will be put into *** and efficiency of railway transportation is increasingly *** have designed a high availability quadruple vital co.puter (HAQVC) system based on the analysis of the architecture of the traditional double 2-out-of-2 system and 2-out-of-3 *** HAQVC system is a system with high availability and safety,with prominent characteristics such as fire-new internal architecture,high efficiency,reliable data interaction mechanism,and operation state change *** hardware of the vital CPU is based on ARM7 with the real-time embedded safe operation system (ES-OS).The Markov modeling method is designed to evaluate the reliability,availability,maintainability,and safety (RAMS) of the *** this paper,we demonstrate that the HAQVC system is more reliable than the all voting triple modular redundancy (AVTMR) system and double 2-out-of-2 ***,the design can be used for a specific application system,such as an airplane or high-speed railway system.

关键词： Fault tolerant High availability quadruple vital co.puter (HAQVC) Reliability availability maintainability and safety (RAMS)

A fuzzy-rule-based co.zin model

在线全文

学校读者我要写书评

暂无评论

控制理论与应用（英文版） 2013年第2期11卷 311-315页

作者： Hairong DONG Yan zhao Shigen GAO State Key Laboratory of Rail Traffic control and Safety Beijing Jiaotong University Beijing co.ona Science & technology co. Ltd.

This paper proposes a modified co.zin and velocity-adaptive co.zin flocking model based on fuzzy rules. In the models, agents update their positions through a fuzzy-rule-based decision-making scheme in three perception zones. Stability of the systems are guaranteed. Simulations demonstrate that the co.vergence probability and relative co.verging size are both improved.

关键词： co.zin model Velocity-adaptive co.zin model Flocking Fuzzy rule co.vergence probability

Temperature‐dependent adaptive co.ductivity co.ting for surface charge release and electric field control under electro‐thermal co.pling field

在线全文

学校读者我要写书评

暂无评论

High Voltage 2023年第5期8卷 1082-1092页

作者： Jianyi Xue Zhu Zhang Binbin Li Yushun zhao Lijian Ding School of Electrical Engineering and automation Hefei University of TechnologyHefeiChina Electric Power Research Institute of State Grid Anhui Electric Power co. Ltd.HefeiChina

Surface charge accumulation is the potential criminal for surface insulation failure on spacers under direct current(DC)*** existence of thermal gradient posing the difficulty of surface charge *** study proposes a temperature‐dependent adaptive co.ductivity co.ting technique for surppressing surface charge accumulation under electro‐thermal co.pling field.A two‐dimensional axis‐symmetrical simulation model regrading surface charge co.putation is *** effects of thermal gradients and co.ting co.ductivity on surface charge and electric field distribution are *** results show that the thermal gradient increases the bulk co.ductive current,therefore aggravating surface charge *** effects of the co.ting co.dcutivity on surface charge and electric field co.tains three *** lower co.ting co.ductivity leads to aggravated homo‐polarity charge *** increasing the co.ting co.ductivity,the surface charge and electric field are significantly suppressed at the obtained optimal co.ductivity,where the bulk and surface co.ductive current reach a balance *** increasing the co.ting co.ductivity results in aggravated hetero‐polarity ***,the increase of thermal gradient to an appropriate extent co.tributes to the further suppression of surface charge on co.ted *** is hoped that this study co.ld provide some references for designing highly reliable DC GIL under electro‐thermal co.pling field.

关键词： co.ting charge co.ductivity

Laser direct writing of flexible multifunctional airflow sensors on the Kevlar fabric

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2025年第1期18卷 443-454页

作者： Wei Wang Zi-Qing Chen Yong-Qi Li Yu-Long Wang Mei-Chen Liu Yun-Bo Ruan Yang Zhang Shu-Juan Liu Qiang zhao co.lege of Electronic and Optical Engineering and co.lege of Flexible Electronics(Future technology) Nanjing University of Posts and TelecommunicationsNanjing 210023China State Key Laboratory of Organic Electronics and Information Displays and Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials(IAM)Nanjing University of Posts and TelecommunicationsNanjing 210023China zhe Jiang Topsun Logistic control co. LTD.Yuhuan 317600China Department of Rehabilitation Medicine School of Acupuncture-Moxibustion and Tuina and School of Health Preservation and RehabilitationNanjing University of Chinese MedicineNanjing 210023China

The growing interest in flexible devices has emerged as a global trend due to their advantages in flexibility,lightweight structure,and wearability,addressing the limitations of traditional *** wearable airflow sensors have been previously reported,the development of flexible fabric-based airflow sensors capable of functioning in environments with open flames—critical for fire rescue operations—has yet to be explored,largely due to the poor fire resistance of co.ventional *** this work,we first present a flexible,wearable,and multifunctional airflow sensor with excellent fire-resistant properties,fabricated through a simple direct laser writing *** sensor maintains airflow detection capabilities even in the presence of open ***,the fabrication of fabric-based sensors involves co.plex procedures such as carbon materials doping or vapor-phase deposition,leading to lengthy preparation cycles and high ***,fabric-based devices are inherently prone to *** address these challenges,we introduce twice-vertical laser-induced graphene(TVLIG)as a sensitive and reliable co.ponent for fire-resistant airflow *** resulting TVLIG/Kevlar fabric can be integrated into various garments,particularly protective suits,to form sensitive and fire-resistant airflow sensors capable of detecting airflow velocity and direction in both two-dimensional(2D)and three-dimensional(3D)spaces during fire ***,the TVLIG patterns can be expanded to multifunctional platforms,such as gluco.e detection for injured individuals,offering further applications in rescue *** functional expansion reduces the burden on rescue personnel and streamlines device *** its outstanding sensing capabilities,fire resistance,and expandability,the developed flexible airflow sensor shows great potential for various real-world rescue scenarios,promising advancements in wearable sensing technology for rescue enginee

关键词： flexible airflow sensor direct laser writing twice-vertical laser-induced graphene fire accident rescue Kevlar fabric

Dietary host-associated Bacillus subtilis supplementation improves intestinal microbiota,health and disease resistance in Chinese perch(Siniperca chuatsi)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Animal Nutrition 2023年第2期13卷 197-205页

作者： zhehui Ji Chuanzhong Zhu Xinyang Zhu Sainan Ban Lijuan Yu Juan Tian Lixue Dong Hua Wen Xing Lu Ming Jiang Yangtze River Fisheries Research Institute Chinese Academy of Fishery SciencesWuhanChina Fujian Key Laboratory of Functional Aquafeed and Culture Environment control Fujian DBN-HY Aquatic Science and Technology Group Co.LtdZhao’anChina Beijing DBN technology Group co. LtdBeijingChina

The purpose of this study was to evaluate the potential of a host-associated Bacillus subtilis 1-C-7 as a probiotic for Chinese perch(Siniperca chuatsi).Four test diets were formulated to co.tain graded levels of *** 1-C-7 at 0(CY),0.85×10^(8)(Y1),0.95×10^(9)(Y2)and 0.91×10^(10)(Y3)CFU/kg *** test fish with initial weight 30.0±1.2 g were fed the 4 test diets with 3 replicates in an indoor water-flow aquaculture system with 12 net cages(40 fish/cage)for 10 *** the co.clusion of the feeding trial,the probiotic effects of *** on Chinese perch were analyzed based on growth performance,serum biochemical indices,histologic morphology of liver and gut,gut microbiota and the resistance to Aero-monas *** results showed that the percentage of weight gain had no significant change in the Y1 and Y2 groups(P>0.05)but decreased in the Y3 group co.pared to that in the CY group(Pco.clusion,dietary supplementation of 0.85×10^(8)CFU/kg *** 1-C-7 co.ld improve the intestinal microbiota,intestinal health and disease resistance in Chinese perch,but more or excessive supple

关键词： Bacillus subtilis Intestinal microbiota Intestinal health Disease resistance Chinese perch(Siniperca chuatsi)

Hot Rolled Strip Re-reddening Temperature Changing Law during Ultra-fast co.ling

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2015年第8期22卷 694-702页

作者： Lian-yun JIANG Chun-jiang zhao Jian-hui SHI Guo YUAN Xue-qiang WANG Qing-xue HUANG State Key Laboratory of Rolling and automation Northeastern University School of Mechanical Engineering Taiyuan University of Science and Technology Shougang Qian'an Iron and Steel co. Ltd.

Temperature deviation between surface and the center of hot rolled strip is formed during ultra-fast co.ling （UFC）. Surface temperature would rise when temperature deviation goes up to an extent, and strip re-reddening phenomenon will appear. Strip re-reddening affects the stability of strip microstructure, property and temperature control precision. Thus, it is necessary to co.duct research on re-reddening temperature changing law to improve strip property and temperature control precision. Strip temperature trends for various strip thicknesses and ultra-fast co.ling rates were obtained by numerical calculation method. Re-reddening temperature, temperature deviation between surface and center, and boundary layer position changing law were obtained. By co.parison, some co.clusions were obtained： UFC re-reddening temperature and laminar co.ling （LC） re-reddening temperature were linear to ultra-fast co.ling rate respectively. Ultra-fast co.ling rate affected UFC re-reddening temperature greatly, but it had little effect on LC re-reddening temperature. Equations which were used to calculate UFC re-reddening temperature, LC re-reddening temperature and maximum temperature deviation were obtained. The position of boundary layer stayed in 1/4 strip thickness.

关键词： ultra-fast co.ling laminar co.ling co.ling rate re-reddening temperature