检索结果-南通市图书馆

Horizontal shaking table tests and analysis on structures with multi-dimensional earthquake isolation and mitigation devices

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2009年第7期52卷 2009-2016页

作者： ZhaoDong xu Xiao Zeng KeYi Wu AiQun Li qingyang xu Civil Engineering College Southeast University Nanjing 210096 China Huaxin Past & Telecom Consulting and Designing Institute Co. Ltd Hangzhou 310014 China

The viscoelastic multi-dimensional earthquake isolation and mitigation device is a new kind of passive control device, which has both earthquake isolation and earthquake mitigation abilities. In order to quantify the horizontal earthquake isolation and mitigation effect of this device on structures, shaking table tests on structures with and without the devices and the corresponding analysis on earthquake isolation and mitigation properties are carried out. It can be shown from the experimental and analytical results that the device has both earthquake isolation and earthquake mitigation effects on structures in horizontal direction, and its horizontal earthquake mitigation coefficients can be referred to those of the rubber bearing earthquake isolation structure.

关键词： earthquake isolation and mitigation shaking table test dynamic responses

Influence of the alkyl side chain length on the room-temperature phosphorescence of organic copolymers

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2022年第6期33卷 2965-2968页

作者： qingyang xu Liangwei Ma Xiaohan Lin Qiaochun Wang Xiang Ma Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China

Pure organic room-temperature phosphorescence(RTP)materials have attracted wide attention owing to their excellent luminescent properties and great potential in various *** this work,iminostilbene and its analogues are applied to realize RTP emission by copolymerizing with *** can be concluded that the growth of alkane chain in monomers can enhance the lifetime and photoluminescence quantum yield of RTP emission,and polymers with the larger conjugated structure of the monomer show a longer RTP emission *** work provides a series of new pure organic RTP materials and might provide new thoughts for designing more advanced and superior RTP materials.

关键词： Room-temperature phosphorescence Alkyl chain length Conjugated structure Amorphous polymer

Scene images and text information‐based object location of robot grasping

在线全文

学校读者我要写书评

暂无评论

IET Cyber-Systems and Robotics 2022年第2期4卷 116-130页

作者： Zhichao Liu Kaixuan Ding qingyang xu Yong Song Xianfeng Yuan Yibin Li School of Mechanical Electrical&Information EngineeringShandong UniversityWeihaiChina School of Control Science and Engineering Shandong UniversityJinanChina

With the rapid development of artificial intelligence(AI),the application of this technology in the medical field is becoming increasingly extensive,along with a gradual increase in the amount of intelligent equipment in *** robots can save human resources and replace nursing staff to achieve some *** view of the phenomenon of mobile service robots'grabbing and distribution of patients'drugs in hospitals,a real‐time object detection and positioning system based on image and text information is proposed,which realizes the precise positioning and tracking of the grabbing objects and completes the grasping of a specific object(medicine bottle).The lightweight object detection model NanoDet is used to learn the features of the grasping objects and the object category,and bounding boxes are ***,the images in the bounding boxes are enhanced to overcome unfavourable factors,such as a small object *** text detection and recognition model PP‐OCR is used to detect and recognise the enhanced images and extract the text *** object information provided by the two models is fused,and the text recognition result is matched with the object detection box to achieve the precise posi-tioning of the grasping *** kernel correlation filter(KCF)tracking algorithm is introduced to achieve real‐time tracking of specific objects to precisely control the robot's *** deep learning models adopt lightweight networks to facilitate direct *** experiments show that the proposed robot grasping detection system has high reliability,accuracy and real‐time performance.

关键词： dexterous manipulators neural network‐based,robot control robot vision service robots

L-Tryptophan Sector Urgently Needs Breakthroughs in Low-Cost Technologies

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 Chemical Reporter 2010年第9期21卷 31-31页

作者： xu qingyang

Tryptophan is the third major feed-gradeamino acid, after methionine and lysine. Ithas also gained extensive applications inpharmaceutical, cosmetic, food and healthproduct sectors in recent years. In 2009 theglobal output of L-tryptophan was reportedlyaround 4 000 tons. The consumptionproportion was 20% for medicines, 30%for food and 50% for *** consumes around 300 tons of tryptophana year. It is mainly used in pharmaceuticaland food sectors. As

关键词： medicines methionine cosmetic gained tryptophan ad

Withered Peach Blossoms-A Discussion for the Phenomenon of a Poor Sense of Copyright in Chinese Youth Netizens and the Suggestion Contents

在线全文

学校读者我要写书评

暂无评论

Journal of Economic Science Research 2019年第4期2卷 10-15页

作者： qingyang xu School of Information Management and Statistics WuhanHubei430205China

This proposal expresses a standpoint concerning a discussion for the phenomenon of a poor sense of copyright in Chinese youth netizens and the *** phenomenon of a poor sense of copyright in Chinese youth netizens has *** analyzing it,a clear status of Chinese youth netizens'problems on the poor sense of copyright will be *** the same time,when we consider a discussion for the phenomenon of a poor sense of copyright in Chinese youth netizens and the suggestion,we must address several main reasons that contribute to *** include cultural tradition restriction,incomprehensive market system,inappropriate price incentive,imperfective legal institutions and indifference education *** is valuable for the originators feel free to create better ***,those factors are essential for Chinese youth netizens to consider the way to be cultivated the right spending *** by analyzing all these factors together and then using these results to apply to intensity notional cultural competitiveness and form an innovative *** paper is organized as follows:The first part will outline the poor sense of copyright in Chinese youth netizens'case studies and *** second part is an introduction of the problems of the phenomenon of a poor sense of copyright in Chinese youth *** reasons causing the problems are analyzed in part *** proposals to overcome copyright problem will be advocated in last *** study found that enhancing copyright awareness is a very complex task for Chinese youth *** tradition restriction,incomprehensive market system,inappropriate price incentive,imperfective legal institutions and indifference education system are all factors which bring difficulties to promote copyright awareness in Chinese youth *** those factors with four problems of the phenomenon in China,I offer appropriate suggestions to overcome problems and help youth netizens acquire the

关键词： Chinese youth netizens Copyright awareness Piracy

Systems metabolic engineering strategies for the production of amino acids

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Synthetic and Systems Biotechnology 2017年第2期2卷 87-96页

作者： Qian Ma Quanwei Zhang qingyang xu Chenglin Zhang Yanjun Li Xiaoguang Fan Xixian Xie Ning Chen National and Local United Engineering Lab of Metabolic Control Fermentation Technology Tianjin University of Science and TechnologyTianjin300457China Key Laboratory of Industrial Fermentation Microbiology Ministry of EducationTianjin University of Science and TechnologyTianjin300457China College of Biotechnology Tianjin University of Science and TechnologyTianjin300457China

Systems metabolic engineering is a multidisciplinary area that integrates systems biology,synthetic biology and evolutionary *** is an efficient approach for strain improvement and process optimization,and has been successfully applied in the microbial production of various chemicals including amino *** this review,systems metabolic engineering strategies including pathwayfocused approaches,systems biology-based approaches,evolutionary approaches and their applications in two major amino acid producing microorganisms:Corynebacterium glutamicum and Escherichia coli,are summarized.

关键词： Systems metabolic engineering Amino acid Corynebacterium glutamicum Escherichia coli

Effects of aroP gene disruption on L-tryptophan fermentation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2012年第2期6卷 158-162页

作者： Qian LIU Yongsong CHENG qingyang xu Xixian XIE Ning CHEN College of Biological Engineering Tianjin University of Science&TechnologyTianjin 300457China

The production of L-tryptophan through che- mical synthesis, direct fermentation, bioconversion and enzymatic conversion has been reported. However, the role of the transport system for the aromatic amino acids in L- tryptophan producing strains has not been fully explored. In this study, the atop gene of the L-tryptophan producing Escherichia coli TRTH strain was disrupted using Red recombination technology and an atoP mutant E. coli TRTH AaroP was constructed. Fed-batch fermentation of E. coli TRTH △aroP was carried out in 30-L fermentor to investigate the L-tryptophan production. Compared with E. coli TRTH, the atoP mutant was able to maintain a higher growth rate during the exponential phase of the fermentation and the L-tryptophan production increased by 13.3%.

关键词： Escherichia coli TRTH aroP L-tryptophan fermentation Red recombination

Effects of edge on graphene plasmons as revealed by infrared nanoimaging

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2016年第1期5卷 266-274页

作者： qingyang xu Teng Ma Mohammad Danesh Bannur Nanjunda Shivananju Sheng Gan Jingchao Song Cheng-Wei Qiu Hui-Ming Cheng Wencai Ren Qiaoliang Bao Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow University199 Ren-ai RoadSuzhou 215123JiangsuChina Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China Department of Electrical and Computer Engineering National University of Singapore4 Engineering Drive 3Singapore 117583Singapore Department of Materials Science and Engineering Monash UniversityClaytonVictoria 3800Australia

We used scattering-type scanning near-field optical microscopy(s-SNOM)to investigate the plasmonic properties of edges in well-defined graphene nanostructures,including sharp tapers,nanoribbons and nanogaps,which were all fabricated via the growth-etching chemical vapor deposition(GECVD)*** obtained near-field images revealed the localized plasmon modes along the graphene nanoribbon;these modes strongly depended on the size of the graphene pattern,the angle of the tapered graphene and the infrared excitation *** interesting plasmon modes were verified by numerical simulations and explained by the reflection,and interference of electromagnetic waves at the graphene–SiO_(2) *** constructive interference at the graphene nanogap caused by charge accumulation was demonstrated for the first *** the infrared nanoimaging technique,greater plasmon broadening was observed in the zigzag edge than in the armchair *** study suggests that graphene edges should be separated by an effective working distance to avoid the overlapping of localized plasmon modes,which is very important for the design of graphene-based plasmonic circuits and devices.

关键词： edge chirality graphene graphene plasmon nanoribbon nanogap near-field microscopy s-SNOM

Monocular Image Depth Estimation Using a Conditional Generative Adversarial Net

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Monocular Image Depth Estimation Using a Conditional Generat...