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Sinusoidal disturbance induced topology identification of Hindmarsh-Rose neural networks

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Science China(Information Sciences) 2016年第11期59卷 83-91页

作者： Junchan ZHAO m.A.AZIZ-ALAOUI Cyrille BERTELLE Nathalie CORSON The School of mathematics and Statistics Hunan University of Commerce Key Laboratory of Hunan Province for mobile Business Intelligence Hunan University of Commerce UNIHAVRE LMAH Normandie University 4. UNIHAVRE LITIS Normandie University

Topology identification of complex networks is an important problem. Existing research shows that the synchronization of network nodes is an obstacle in the identification of network topology. Identification of the structure of the network presents an interesting challenge during the synchronization of complex *** developed a new method using the sinusoidal disturbance to identify the topology when the complex network achieves synchronization. Compared with the disturbance of all the nodes, the disturbance of the key nodes alone can achieve a very good effect. Finally, numerical simulation data are provided to validate our hypothesis.

关键词： complex network topology identification sinusoidal disturbance persistently exciting condition Hindmarsh-Rose system

Thermodynamic modeling of mgO-Al_(2)O_(3)-TiO_(2) System

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China's Refractories 2021年第3期30卷 17-22页

作者： Oksana m.BORYSENKO Galina m.SHABANOVA Sergey m.LOGVINKOV Lgor A.OSTAPENKO Kharkiv Polytechnic Institute National Technical UniversityKharkiv 61002Ukraine Simon Kuznets Kharkiv National University of Economics Kharkiv 61166Ukraine TOV"Druzhkivskiy Vognetrivkiy zavod" Druzhkovka 84293Ukraine

This scientific paper gives consideration to the information on the structure of the triple component system,in particular mgO-Al_(2)O_(3)-TiO_(2) that serves as a basis for the production of thermal resistance *** structure of such binary systems as mgO-Al_(2)O_(3),Al_(2)O_(3)-TiO_(2),mgO-TiO_(2) was described and the data available for the mgO-Al_(2)O_(3)-TiO_(2) system were *** data on all the system compounds were also presented and used for the computation of a change in the free Gibbs energy in the temperature range form 800 K to 1900 K for the basic exchange *** was established that the triangulation of the mgO-Al_(2)O_(3)-TiO_(2) system was changed in the three temperature intervals:in the temperature range lower than 1537 K TiO_(2) existed as the polymorphous modification,***;in the temperature range from 1537 K to 2076 K TiO_(2) existed as a polymorphous modification in form of rutile and tialite was stable;and at the temperatures above 2076 K the availability of stochiometric compound of Al4TiO_(8) was *** the temperature range lower than 1537 K the two-phase equilibra of Al_(2)O_(3)-mgTi2O_(5),mg-mgALCU mgTiO_(3)-mgAl_(2)O_(4),and mg_(2)TiO_(4)-mgAl_(2)O_(4) were stable;in the temperature range from 1537 K to 2076 K the two-phase equilibria of mgTigO_(5)-AlgTiO_(5),mgTiO_(3)-Al_(2)TiO_(5),mgTiO_(3)-Al_(2)O_(3),mgTiO_(3)-mgAl_(2)O_(4),and mg_(2)TiO_(4)-mgAl_(2)O_(4) were stable,and above 2076 K the mgTi_(2)O_(5)-Al_(2)TiO_(5),mgTi_(2)O_(5)-Al_(4)TiO_(8),Al_(4)TiO_(8)-mgTiO_(3),Al_(4)TiO_(8)-mg_(2)TiO_(4),Al_(4)TiO_(8)-mg0,and Al_(4)TiO_(8)-mgAl_(2)O_(4) systems were stable.

关键词： phase equilibria change in Gibbs free energy triangulation magnesium aluminate spinel tialite geikielite carroite qandilite

KINETIC mODELING OF ESTERIFICATION OF EPOXY RESIN IN THE PRESENCE OF TRIPHENYLPHOSPHINE FOR PRODUCING VINYL ESTER RESIN: mECHANISTIC RATE EQUATION

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Chinese Journal of Polymer Science 2006年第6期24卷 599-608页

作者： m. Rafizadeh H. Ghasemi V. Haddadi-Asl Polymer Engineering Department Amirkabir University of TechnologyP. O. Box 15785-4414TehranIran

Due to its mechanical properties and ease of use, vinyl ester resin is enjoying increasing consideration. This resin normally is produced by reaction between epoxy resin and unsaturated carboxylic acid. In the present study, bis-phenol A based epoxy resin and methacrylic acid was used to produce vinyl ester resin. The reaction was conducted under both stoichiometric and non-stoichiometric conditions in the presence of triphenylphosphine as catalyst. The stoichiometric and non-stoichiometric experiments were conducted at 95, 100, 105 and 110℃ and at 90 and 95℃, respectively. The first order rate equation and mechanism based rate equation were examined. Parameters are evaluated by least square method. A comparison of mechanism based rate equation and experimental data show an excellent agreement. Finally, Arrhenius equation and activation energy were presented.

关键词： Esterification Epoxy resin Vinyl ester resin Kinetic Rate equation.

Low symmetry aspects in spectroscopic and magnetic susceptibility studies of Tb^(3+)(4f^8) in TbAlO_3

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Journal of Rare Earths 2009年第4期27卷 627-632页

作者： C.Rudowicz P.Gnutek m.G.Brik modeling in Spectroscopy Group Institute of Physics West Pomeranian University of Technology Institute of Physics University of Tartu

The three sets of crystal field parameters （CFPs） obtained from spectroscopic and magnetic susceptibility studies of Tb3＋（4f^8） ions in TbAlO3 by Gruber et al. （J. Lumin. 128 （2008） 1271） were reanalyzed. These sets, fitted from experimental energy levels, are physically equivalent and correspond to specific choices of the axis system. Proper interpretation of experimental data for Tb3＋ ions at monoclinic C8 symmetry sites in TbAlO3 crystal requires clarification of several intricate low syrmnetry aspects, namely, （a） three equivalent forms of monoclinic CF Hamiltouian, （b） relative orientation of the crystallographic axis system w.r.t, the symmetry-adapted axis system, （c） monoclinic standardization of CFPs, （d） distinction between the actual and apparent low symmetry effects exhibited by CFPs, and （e） nominal nature of all fitted CFP sets. For this purpose, modeling of CFPs for Tb3＋ in TbAlO3 was carried out using at the first stage only the Coulomb, i.e. point charge, eonlribntions in the exchange charge model. The point charge model calculated CFPs disagree with the experimental CFPs, especially the rank k=6 CFPs. To explain this discrepancy and to verify the correcmess of the theoretical CFP calculations additionally the superposition model was employed. The methods of analysis and modeling of CFP sets for monoclinic symmetry cases proposed here proved useful for the studied case as well as might be used for other ion-host systems exhibiting monoclinic or triclinic local site symmetry. Partial results for Tb3＋ ions in TbAlO3 were presented here, whereas detailed results were given in a follow-up paper.

关键词： Tb3+ ions TbAlO3 spectroscopy crystal-field magnetic susceptibility low symmetry aspects rare earths

Hot-nanoparticle-mediated fusion of selected cells

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Nano Research 2017年第6期10卷 2034-2045页

作者： Azra Bahadori Lene B. Oddershede Poul m. Bendix Blegdamsvej 17 Niels Bohr Institute University of Copenhagen 2100 Copenhagen Denmark Lundbeck Foundation Center for Biomembranes in Nanomedicine University of Copenhagen 2100 Copenhagen Denmark

Complete fusion of two selected ceils allows for the creation of novel hybrid cells with inherited genetic properties from both original cells. Alternatively, via fusion of a selected cell with a selected vesicle, chemicals or genes can be directly delivered into the cell of interest, to control cellular reactions or gene expression. Here, we demonstrate how to perform an optically controlled fusion of two selected cells or of one cell and one vesicle. Fusion is mediated by laser irradiating plasmonic gold nanoparticles optically trapped between two cells （or a vesicle and a cell） of interest. This hot-particle-mediated fusion causes total mixing of the two cytoplasms and the two cell membranes resulting in formation of a new hybrid cell with an intact cell membrane and enzymatic activity following fusion. Similarly, fusion between a vesicle and a cell results in delivery of the vesicle cargo to the cytoplasm, and after fusion, the cell shows signs of viability. The method is an implementation of targeted drug delivery at the single-cell level and has a great potential for cellular control and design.

关键词： cell fusion membrane fusion gold nanoparticle plasmonic heating optical trapping

A Coupled Soil-Fluid-Structure Simulation of the Near-Field Earthquake Effects on Gravity Type Quay-Walls

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China Ocean Engineering 2013年第4期27卷 481-494页

作者： m.Zeinoddini H.matin Nikoo F.Ahmadpour Faculty of Civil Engineering K.N.Toosi University of Technology

This study focuses on non-linear seismic response of concrete gravity quay-wall structures subjected to near-fault ground motions, a subject which seems not to have received much attention in the literature. A two-dimensional coupled fluid-structure-soil finite element modelling is employed to obtain the quay-wall response. The seawater medium is represented by acoustic type, potential based fluid elements. The elasto-plastic behavior of the soil medium is idealized using Drucker-Prager yield criterion based on associated flow rule assumption. Four nodded plane strain elements are used to model the concrete wall, foundation, subsoil, backfill and seabed zones. Fluid Structure Interface （FSI） elements are considered between the seawater interfaces with the quay-wall and the seabed. Frictional contact elements are employed between the wall and soil interfaces. The numerical model is validated using field measurements available for permanent drifts in a quay-wall damaged during Kobe earthquake. Reasonable agreements are obtained between the model predictions and the field measurements. Non-linear seismic analyses of the selected quay-wall subjected to both near-fault and far-fault ground motions are performed. An incremental dynamic analysis approach （IDA） is used. In general, at least for models examined in the current study, the gravity quay-walls are found to be more vulnerable to near-field, in comparison with the corresponding far-field, earthquakes.

关键词： coastal structure gravity quay-wall near-fault earthquake Incremental Dynamic Analysis (IDA)

mass transfer area in a multi-stage high-speed disperser with split packing

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Chinese Journal of Chemical Engineering 2019年第4期27卷 772-780页

作者： Tao Ai Aslam m.mudassar Ziqi Cai Zhengming Gao State Key Laboratory of Chemical Resource Engineering School of Chemical Engineering Beijing University of Chemical Technology Beijing 100029 China Beijing Advanced Innovation Center for Soft matter Science and Engineering Beijing University of Chemical Technology Beijing 100029 China

In this study, the mean droplet diameter in the cavity zone and the total mass transfer area of a multi-stage highspeed disperser(HSD) reactor with different packing combinations were measured and evaluated. The effects of rotational speed and packing radius, as well as the packing ring radius and numbers, on the mean droplet diameter and the total mass transfer area were evaluated. A model was established to calculate the mass transfer area in the cavity zone in the HSD reactor, and it was found that the packings contribute 61%–82% of the total mass transfer area. A correlation for predicting the mass transfer area in the packing zone was regressed by the dimensionless analysis method. An enhancement factor based on the mass transfer area in the packing zone was proposed to evaluate the effect of packing combination on mass transfer area. Two optimum packing combinations were proposed in consideration of the mean droplet diameter and the enhancement factor.

关键词： High-speed disperser mean droplet diameter mass transfer area Split packing

Secure Inverted Index Based Search over Encrypted Cloud Data with User Access Rights management

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Journal of Computer Science & Technology 2019年第1期34卷 133-154页

作者： Fateh Boucenna Omar Nouali Samir Kechid m.Tahar Kechadi Security Division Research Center for Scientific and Technical InformationAlgiers 16028Algeria Laboratory of Research in Artificial Intelligence Department of Computer ScienceUniversity of Sciences and Technology H Suari B oumedieneAlgiers 16111Algeria The Insight Centre Unversity College DublinDublinDO4 VIW8Ireland

Cloud computing is a technology that provides users with a large storage space and an enormous computing ***,the outsourced data are often sensitive and confidential,and hence must be encrypted before being ***,classical search approaches have become obsolete and new approaches that are compatible with encrypted data have become a *** privacy reasons,most of these approaches are based on the vector model which is a time consuming process since the entire index must be loaded and exploited during the search process given that the query vector must be compared with each document *** solve this problem,we propose a new method for constructing a secure inverted index using two key techniques,homomorphic encryption and the dummy documents ***,1)homomorphic encryption generates very large ciphertexts which are thousands of times larger than their corresponding plaintexts,and 2)the dummy documents technique that enhances the index security produces lots of false positives in the search *** proposed approach exploits the advantages of these two techniques by proposing two methods called the compressed table of encrypted scores and the double score ***,we exploit a second secure inverted index in order to manage the users'access rights to the ***,in order to validate our approach,we performed an experimental study using a data collection of one million *** experiments show that our approach is many times faster than any other approach based on the vector model.

关键词： searchable encryption cloud computing homomorphic encryption attributeqbased encryption inverted index

Nonlinear transverse vibrations of a slightly curved beam carrying a concentrated mass

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Acta mechanica Sinica 2009年第6期25卷 871-882页

作者： E.zkaya m.Sarigül H.Boyaci Department of mechanical Engineering Celal Bayar UniversityMuradiye

In this study, a slightly curved Euler Bernoulli beam carrying a concentrated mass was handled. The beam was resting on an elastic foundation and simply supported at both ends. Effects of the concentrated mass on nonlin- ear vibrations were investigated. Sinusoidal and parabolic type functions were used as curvature functions. Equations of motion have cubic nonlinearities because of elongations during vibrations. Damping and harmonic excitation terms were added to the equations of motion. method of mul- tiple scales, a perturbation technique, was used for solving integro-differential equation analytically. Natural frequen- cies were calculated exactly for different mass ratios, mass locations, curvature functions, and linear elastic foundation coefficients. Amplitude-phase modulation equations were found by considering primary resonance case. Effects of nonlinear terms on natural frequencies were calculated. Frequency-amplitude and frequency-response graphs were plotted. Finally effects of concentrated mass and chosen curvature function on nonlinear vibrations were investigated.

关键词： Nonlinear vibrations . Slightly curved beamNonlinear elastic foundation. Concentrated mass