56 research outputs found

    Synthesis of conductive carbon aerogels decorated with β-tricalcium phosphate nanocrystallites

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    There has been substantial interest in research aimed at conductive carbon-based supports since the discovery that the electrical stimulus can have dramatic effect on cell behavior. Among these carbon-aerogels decorated with biocompatible polymers were suggested as future materials for tissue engineering. However, high reaction temperatures required for the synthesis of the aerogels tend to impair the stability of the polymeric networks. Herein, we report a synthetic route towards carbon-aerogel scaffolds decorated with biocompatible ceramic nanoparticles of tricalcium phosphate. The composites can be prepared at temperature as high as 1100 °C without significant effect on the morphology of the composite which is comparable with the original aerogel framework. Although the conductivity of the composites tends to decrease with the increasing ceramic content the measured conductivity values are similar to those previously reported on polymer-functionalized carbon-aerogels. The cell culture study revealed that the developed constructs support cell proliferation and provide good cell attachment suggesting them as potentially good candidates for tissue-engineering applications

    Decision-Making Ontology for Information System Engineering

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    International audienceInformation Systems (IS) engineering (ISE) processes contain steps where decisions must be made. Moreover, the growing role of IS in organizations involves requirements for ISE such as quality, cost and time. Considering these aspects implies that the number of researches dealing with decision-making (DM) in ISE increasingly grows. As DM becomes widespread in the ISE field, it is necessary to build a representation, shared between researchers and practitioners, of DM concepts and their relations with DM problems in ISE. In this paper, we present a DM ontology which aims at formalizing DM knowledge. Its goal is to enhance DM and to support DM activities in ISE. This ontology is illustrated within the requirements engineering field

    Anomalous WW-Gamma Vertex in Gamma-p Collision

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    The potential of LC+HERAp based Gamma-p collider to probe WW-Gamma vertex is presented through the discussion of sensitivity to anomalous couplings and P_T distribution of the final quark. The limits of -0.04<\Delta\kappa<0.04 and -0.11<\lambda<0.11 at 95% C.L. can be reached with integrated luminosity 200(1/pb). The limit for \Delta\kappa is comparable to one which is expected from LHC. The bounds are also obtained from corresponding ep collider using Weizsacker-Williams Approximation to compare with real photons.Comment: 8 pages, 2 eps figure

    Geographical and temporal distribution of SARS-CoV-2 clades in the WHO European Region, January to June 2020

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    We show the distribution of SARS-CoV-2 genetic clades over time and between countries and outline potential genomic surveillance objectives. We applied three available genomic nomenclature systems for SARS-CoV-2 to all sequence data from the WHO European Region available during the COVID-19 pandemic until 10 July 2020. We highlight the importance of real-time sequencing and data dissemination in a pandemic situation. We provide a comparison of the nomenclatures and lay a foundation for future European genomic surveillance of SARS-CoV-2.Peer reviewe

    LMI-based sliding mode control design and experimental application to an electromechanical plant

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    6th International Conference on Electrical and Electronics Engineering, ICEEE 2019 --16 April 2019 through 17 April 2019 -- --Recently, sliding mode control because of convenience and robustness has become a preferred method. In this paper, LMI-based sliding mode controller is designed for speed control of Precision Modular Servo experiment (PMS). For ensure the stability of the system the Lyapunov stability theorem is used. The experimental results is used to affirm that the proposed controller ensures suitable tracking performance and chattering reduction. © 2019 IEEE.Firat University Scientific Research Projects Management Unit?This work has been supported by the Cukurova University Scientific Research Projects Unit under Grant No. FDK-2018-10464

    Sliding mode control design and experimental application to an electromechanical plant

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    57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University, RTUCON 2016 --13 October 2016 through 14 October 2016 -- --In recent years, sliding mode control has become a preferred because of its convenience and robustness. And sliding mode control techniques have been commonly employed in a various applications. In this study, the Precision Modular Servo (PMS) setup produced by Feedback is used and the sliding mode controller is designed to control the real time speed of the PMS. Lyapunov stability theorem is used to ensure the stability of the system. Saturation function is preferred to overcome the chattering phenomenon. The results obtained from the real application are compared with those from simulation in dynamic responses of the closed-loop control system. The experimental results confirm that the offered controller provides suitable tracking performance. © 2016 IEEE

    Second-order sliding mode control design and experimental application to a servo motor

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    2017 International Conference on Mechanical, System and Control Engineering, ICMSC 2017 --19 May 2017 through 21 May 2017 -- --In this study, first-order and second-order sliding mode speed controller for the Precision Modular Servo (PMS) setup produced by Feedback Instruments is proposed. The second-order sliding mode controller which permits decimate of the chattering phenomena is designed to control the real time speed of this electromechanical system. The Lyapunov stability theorem is used to confirm the stability of the system. And first-order and second-order sliding mode speed controllers are compared with each other. Experimental results are compared under condition of the same control strategy. The experimental results confirm that the offered super-twisting algorithm sliding mode controller eliminates the chattering while preserving the robustness of the control. © 2017 IEEE

    A numerical approach to solve the model of an electromechanical system

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    In this paper, the model of an electromechanical system, which is a system of linear differential equations, is studied. Haar wavelet collocation method (HWCM) is applied for finding the approximate solution of the model. HWCM reduces the system of the model into a matrix-vector form that contains the unknown Haar coefficients, and these coefficients are easily calculated. To demonstrate the validity and applicability of HWCM, numerical solutions of the system for different parameter values in the system are presented. The obtained results demonstrate the efficiency and accuracy of the method. All of the computations are performed via a program written in Mathematica. © 2018 John Wiley & Sons, Ltd