检索结果-南通市图书馆

A tendon system to re-center steel moment frames with weak stories

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2024年第4期23卷 1057-1072页

作者： wang Tao wang fei Masayoshi Nakashima Institute of Engineering Mechanics China Earthquake AdministrationBeijing 100190China Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake AdministrationHarbin 150080China Disaster Prevention Research Institute Kyoto UniversityGokashoUjiKyoto 611-0011Japan

A wide open bottom story of a frame building is often expected by owners for use as a garage or ***,this leads to weak stories due to abrupt changes in lateral stiffness and often results in unexpected story collapse as observed in many previous *** retrofit frame buildings that have experienced weak story damage,a tendon system is proposed in this study,which consists of a set of swaying columns and *** swaying columns are used to uniformly redistribute the lateral deformation along the height,while the tendons provide extra lateral stiffness and renders the entire structural system a re-centering *** avoid unnecessary forces to swaying columns,pin-connections are used at the *** are placed over the entire story to gain large elastic *** analysis reveals that the swaying column,with a stiffness of about 0.9 times that of the weak story,and the tendons attached at the roof,with a stiffness of 0.04 times that of the weak story,can provide the optimal performance with a maximum residual story drift angle of less than 0.5%.Online hybrid tests were carried out,which demonstrated that uniformly distributed story drifts and acceptable residual deformation could be achieved by the proposed tendon system.

关键词： tendon system re-centering capability residual deformation rehabilitation collapse prevention

New Chief, New Journey, New Excellence

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2018年第1期5卷 1-2页

作者： fei-Yue wang IEEE

After five years planning and working for its creation,and four years serving as its Founding Editor-in-Chief,it is time for me to step down and free IEEE/CAA Journal of Automatica Sinica to the new journey for its ne... 详细信息

关键词： New Journey New Chief New Excellence Man

HAS QoE prediction based on dynamic video features with data mining in LTE network

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2017年第4期60卷 196-209页

作者： fei wang Zesong fei Jing wang Yifan LIU Zhikun WU School of Information Science and Engineering Beijing Institute of Technology

Evaluation of HTTP adaptive streaming(HAS) quality of experience(Qo E) over LTE network is a challenging topic because of multi-segment and multi-rate features of dynamic video sequences. Different from the traditional Qo E evaluation methods based on network parameters, this paper proposes the HAS Qo E prediction methods based on its dynamic video segment features with data mining. Considering the application requirement of the trade-off between accuracy and complexity, two sets of methodologies are designed to evaluate the HAS Qo E including regression and classification. In regression method, we propose the evolved PSNR(e PSNR) model using differential peak signal to noise ratio(d PSNR) statistics as the segment features to evaluate HAS Qo E. In classification method, we propose the improved weighted k-nearest neighbors(Wk NN)by using dynamic weighted mapping according to the position of video chunk to meet the dynamic segment and rate features of HAS. In order to train and test these methods, we build a real-time HAS video-on-demand(VOD) system in LTE network and do subjective test in different video scenes. With the mean opinion score(MOS), the regression and classification methods are trained to predict the HAS Qo E. The validated results show that the proposed e PSNR and Wk NN methods outperform other evaluation methods.

关键词： HTTP adaptive streaming(HAS) quality of experience(Qo E) regression classification data mining video-on-demand(VOD) long term evolution(LTE)

From Plant Modeling to Narrative Science:Growing and Enjoying Scientific Fruits Naturally and Humanistically

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2024年第12期11卷 2522-2524页

作者： fei-Yue wang IEEE Macau University of Science and Technology the State Key Laboratory for Management and Control of Complex Systems Chinese Academy of Sciences

Dear Editor,Modeling is the first and essential step for control and automation,and large models, from current Chat GPT or large language models(LLMs) to future large knowledge models of knowledge automation,would be ... 详细信息

关键词： science modeling plant from enjoying fruits growing humanistically narrative naturally

Fabrication of nickel oxide functionalized zeolite USY composite as a promising adsorbent for CO_(2) capture

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 Engineering 2022年第6期35卷 207-213页

作者： Jipeng Dong fei wang Guanghui Chen Shougui wang Cailin Ji fei Gao Shandong Key Laboratory of Multiphase Fluid Reaction and Separation Engineering College of Chemical EngineeringQingdao University of Science and TechnologyQingdao 266042China Department of Chemical Engineering Qingdao University of Science and TechnologyGaomi 261500China

Adsorption process is considered to be the most promising alternative for the CO_(2) capture to the traditional energy-intensive amine absorption process,and the development of feasible and efficient CO_(2) adsorbents is still a *** this work,the NiO@USY(ultrastable Y)composites with different NiO loadings were prepared for the CO_(2) adsorption using Ni(NO_(3))_(2) as the *** composites were characterized by X-ray photoelectron spectroscopy,X-ray diffraction,nitrogen adsorption–desorption test,scanning electron microscopy analysis,and thermogravimetric analysis,and were evaluated for the CO_(2) adsorption capacity,CO_(2)/N2 adsorption selectivity and CO_(2) cycle adsorption *** characterization results show that after the activation at 423 K,the Ni(NO_(3))_(2) species were well dispersed into the surface of zeolite USY,and after the further activation at 823 K,Ni(NO_(3))_(2) could be converted into highly dispersed *** adsorption results show that the presence of the active component NiO plays an important role in improving the CO_(2) adsorption performance,and the NiO@USY composite with a NiO loading of 1.5 mmol·g^(-1) USY support displays a high adsorption capacity and adsorption selectivity for CO_(2),and shows a good cycle *** addition,the Clausius–Clapeyron equation was used to evaluate the isosteric heat of adsorption of CO_(2) on the NiO(1.5)@USY composite,and the heat of adsorption was 17.39–38.34 kJ·mol^(-1).

关键词： NiO@USY composites Carbon dioxide Adsorption Separation Adsorption selectivity

ASSOCIATION BEHAVIOR OF PORPHYRIN PENDANTS IN pH-SENSITIVE WATER-SOLUBLE POLYMER

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2012年第1期30卷 63-71页

作者： Ke—wei Ding fei wang fei-peng Wu Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

A novel tripyridylporphyrin monomer,5-[4-[2-（acryloyloxy）ethoxy]phenyl]-10,15,20-tris（4-pyridyl）porphyrin （TrPyP）,was synthesized and polymerized with acrylamide（AM） to prepare the hydrophobically associating water-soluble polymer *** aggregation behavior of porphyrin pendants was investigated by UV-Visible and fluorescence *** polymer displays a strong tendency of hydrophobic association even in dilute *** increasing the concentration,the maximum absorption wavelength of Soret band changes from 416 nm to 407 nm,and the fluorescence corrected for the inner filter effect exhibits moderate concentration *** the results indicate thatπ-πinteraction of porphyrin pendants plays a key role in association of PAM-TrPyP,and H-aggregates of porphyrins are mainly formed in the concentrated *** the other hand,dynamic light scattering（DLS） and transmission electron microscopy（TEM） were used to follow the changes in size and structure of the macromolecular assemblies with the concentration *** polymer aggregation conformation changes from loose ＂vesicle-like＂ morphology to solid globule *** pH value of solution decreases to 4.3,pyridine moieties on porphyrin pendants could be protonated and the H-aggregates formed in macromolecular matrix are destroyed by electrostatic repulsion interactions.

关键词： Porphyrin Water-soluble polymer π-πInteractions H-aggregate pH-sensitivity

Elimination of Anti-spiral Waves by Local Inhomogeneity in Oscillatory Systems

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2008年第6期21卷 575-580页

作者： Fu-cheng Liu Xiao-fei wang College of Physics Science & Technology Hebei University Baoding 071002 China

Anti-spiral waves are controlled in an oscillatory system by using a local inhomogeneity. The inhomogeneity acts as a wave source, and gives rise to the propagating plane waves, tt is found that there is a critical pacemaking domain size below which no wave will be created at all. Two types of ordered waves （target waves and traveling waves） are created depending on the geometry of the local inhomogeneity. The competition between the anti-spiral waves and the ordered waves is discussed. Two different competition mechanisms were observed, which are related to the ordered waves obtained from different local inhomogeneities. It is found that traveling waves with either lower frequency or higher frequency can both eliminate the anti-spiral waves, while only the target waves with lower absolute value of frequency can eliminate the anti-spiral waves. This method also applies to outwardly rotating spiral waves. The control mechanism is intuitively explained and the control method is easily operative.

关键词： Anti-spiral wave Traveling wave Inhomogeneity Oscillatory system

Determination of Polynomial Degree in the Regression of Drug Combinations

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2017年第1期4卷 41-47页

作者： Boqian wang Xianting Ding fei-Yue wang School of Biomedical Engineering Shanghai Jiao Tong University IEEE State Key Laboratory of Management and Control for Complex Systems Institute of Automation Chinese Academy of Science (SKL-MCCS CASIA) Research Center of Computational Experiments and Parallel Systems National University of Defense Technology

Studies on drug combinations are becoming more and more popular in the past few decades, with the development of computer and algorithms. One of the most common methods in optimizing drug combinations is regression of a polynomial model based on certain number of experimental observations. In this paper, we study how to determine the degree of polynomials in different circumstances of drug combination optimization. Using cross-validation, we have found that in most cases, a high degree results in failures of accurate prediction, named overfitting. An anti-noise test has also revealed that polynomial model with high degree tends to be less resistant to random errors in the observations. © 2014 Chinese Association of Automation.

关键词： Acoustics Random errors Regression analysis

Radical-Mediated Selective Functionalization of Unactivated Primary C-H Bonds

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2022年第14期40卷 1751-1753页

作者： Zhan-Lin wang fei wang State Key Laboratory of Elemento-Organic Chemistry College of ChemistryNankai UniversityTianjin 300071China

Radical-mediated sp^(3)C—H functionalization has found broad applications in synthesis and late-stage derivatization of complex *** site-selectivity of a given reaction is mainly dictated by the bond strength,polarity and steric accessibility of diverse C—H bonds as well as the characters of hydrogen atom *** sp^(3)C—H bonds usually follow the relative reactivity sequence of tertiary>secondary>primary,which is even recognized as the innate preferences of certain *** development of innovative methods capable of overriding the“inherent”site-selectivity is exceedingly *** it has been demonstrated that secondary C—H bonds could be selectively converted in the presence of weaker tertiary C—H bonds by tuning the steric and electronic properties of hydrogen atom acceptors,the selective activation of primary C—H bonds remains a daunting ***,we highlight the recently emerging attempts towards this goal by interrogating the steric effect of hydrogen atom acceptors.

关键词： C-H activation Hydrogen atom transfer Radical reactions Regioselectivity Steric hindrance