The Experts below are selected from a list of 206031 Experts worldwide ranked by ideXlab platform

Matthew Obrien - One of the best experts on this subject based on the ideXlab platform.

  • continuous flow liquid liquid separation using a computer vision control system the bromination of enaminones with n bromosuccinimide
    Synlett, 2015
    Co-Authors: Matthew Obrien, Dennis A Cooper
    Abstract:

    Incorporating open-source software components (Python, OpenCV), a computer-vision system was used to control the Interface Level in a gravity-based inline liquid–liquid separation device. This was used in the continuous flow bromination of a series of enaminone substrates. The main byproduct of the reaction, succinimide, was efficiently extracted into the aqueous stream, providing clean products without the need for further purification.

  • a prototype continuous flow liquid liquid extraction system using open source technology
    Organic and Biomolecular Chemistry, 2012
    Co-Authors: Matthew Obrien, Peter Koos, Duncan L Browne
    Abstract:

    A prototype continuous-flow liquid–liquid extraction system is reported. By harnessing several open-source software libraries, a computer control script was written using the Python programming language. Using a ‘computer-vision’ approach, this allowed the computer to monitor the Interface Level between the organic and aqueous phases using a simple webcam setup and (by dynamically controlling pump flow rate) to keep this Interface within defined limits. The system enabled the efficient ‘inline’ extraction of excess reagent in hydrazone formations, dithiane formations and epoxidations. The initial results of dispersion measurement are also presented.

Gabriele Milani - One of the best experts on this subject based on the ideXlab platform.

  • modelling of the bond behaviour of curved masonry specimens strengthened by cfrp with anchor spikes
    Composites Part B-engineering, 2019
    Co-Authors: Ernesto Grande, Mario Fagone, Tommaso Rotunno, Elisa Bertolesi, Gabriele Milani
    Abstract:

    Abstract Aim of the present paper is the proposal of a simple modeling approach for the numerical simulation of the bond behavior of masonry specimens externally strengthened by FRP strips equipped with anchor spikes. The model is based on a simple 1D-schematization of specimens, previously proposed by the authors and based on the use of linear and nonlinear spring elements schematizing the support, the FRP, the masonry/FRP Interface. The approach here proposed specifically considers the coupled behavior between shear and normal stresses arising at the masonry/FRP Interface Level and, moreover, it introduces constitutive laws for modeling local failure mechanisms involving the anchor. The parameter setting procedure presented in the paper is indeed devoted to implicitly consider the contribution of the anchor and its interaction with the masonry support, directly at the FRP/masonry Interface Level. This allows to reduce computational efforts while preserving a good reliability Level of the model. The validation of the proposed modeling approach is here carried out by considering experimental tests performed by the authors and available in the current literature. The results obtained from the numerical analyses reported in the paper show both the reliability of the proposed approach to capture the experimental behavior and, moreover, its efficacy for investigating the role of the anchor on the bond behavior of the strengthening system.

  • modeling of frp strengthened curved masonry specimens and proposal of a simple design formula
    Composite Structures, 2016
    Co-Authors: Ernesto Grande, Gabriele Milani
    Abstract:

    Abstract The present paper aims at developing a simple but effective numerical model for the study of the bond behavior of Fiber Reinforced Strengthening systems (FRP) externally applied on curved masonry substrates. The main peculiarities of the proposed model are its simplicity and the possibility to straightforwardly introduce at the Interface Level coupled cohesive laws for accounting a mixed mode debonding mechanism. Indeed, the model relies on a discretization based on in-series and in-parallel springs for modeling the substrate, the reinforcement and the reinforcement/substrate Interface layer. In particular, while both the substrate and the reinforcement springs are assumed linear-elastic, nonlinear constitutive laws are accounted for the Interface springs where, in addition, a coupled behavior between normal and shear springs is assumed considering the Mohr-Coulomb failure domain. The proposed numerical model is used in the paper as a tool for the assessment of formulas specifically devoted to the evaluation of the bond resistance of curved masonry samples strengthened with FRPs. In particular, both formulas derived from the closed form solution of equilibrium equations and a formula derived by approximating the closed form solution through an exponential law are here presented. With the main purpose to validate the proposed model, numerical analyses are preliminary presented in the paper with reference to experimental bond tests on masonry samples with concave and convex substrate configurations strengthened by glass FRP strips. Then, further numerical analyses developed by considering different values of the geometry curvature and mechanical properties of the Interface, are subsequently developed with the main goal to check the reliability of the proposed formulas.

Ernesto Grande - One of the best experts on this subject based on the ideXlab platform.

  • modelling of the bond behaviour of curved masonry specimens strengthened by cfrp with anchor spikes
    Composites Part B-engineering, 2019
    Co-Authors: Ernesto Grande, Mario Fagone, Tommaso Rotunno, Elisa Bertolesi, Gabriele Milani
    Abstract:

    Abstract Aim of the present paper is the proposal of a simple modeling approach for the numerical simulation of the bond behavior of masonry specimens externally strengthened by FRP strips equipped with anchor spikes. The model is based on a simple 1D-schematization of specimens, previously proposed by the authors and based on the use of linear and nonlinear spring elements schematizing the support, the FRP, the masonry/FRP Interface. The approach here proposed specifically considers the coupled behavior between shear and normal stresses arising at the masonry/FRP Interface Level and, moreover, it introduces constitutive laws for modeling local failure mechanisms involving the anchor. The parameter setting procedure presented in the paper is indeed devoted to implicitly consider the contribution of the anchor and its interaction with the masonry support, directly at the FRP/masonry Interface Level. This allows to reduce computational efforts while preserving a good reliability Level of the model. The validation of the proposed modeling approach is here carried out by considering experimental tests performed by the authors and available in the current literature. The results obtained from the numerical analyses reported in the paper show both the reliability of the proposed approach to capture the experimental behavior and, moreover, its efficacy for investigating the role of the anchor on the bond behavior of the strengthening system.

  • modeling of frp strengthened curved masonry specimens and proposal of a simple design formula
    Composite Structures, 2016
    Co-Authors: Ernesto Grande, Gabriele Milani
    Abstract:

    Abstract The present paper aims at developing a simple but effective numerical model for the study of the bond behavior of Fiber Reinforced Strengthening systems (FRP) externally applied on curved masonry substrates. The main peculiarities of the proposed model are its simplicity and the possibility to straightforwardly introduce at the Interface Level coupled cohesive laws for accounting a mixed mode debonding mechanism. Indeed, the model relies on a discretization based on in-series and in-parallel springs for modeling the substrate, the reinforcement and the reinforcement/substrate Interface layer. In particular, while both the substrate and the reinforcement springs are assumed linear-elastic, nonlinear constitutive laws are accounted for the Interface springs where, in addition, a coupled behavior between normal and shear springs is assumed considering the Mohr-Coulomb failure domain. The proposed numerical model is used in the paper as a tool for the assessment of formulas specifically devoted to the evaluation of the bond resistance of curved masonry samples strengthened with FRPs. In particular, both formulas derived from the closed form solution of equilibrium equations and a formula derived by approximating the closed form solution through an exponential law are here presented. With the main purpose to validate the proposed model, numerical analyses are preliminary presented in the paper with reference to experimental bond tests on masonry samples with concave and convex substrate configurations strengthened by glass FRP strips. Then, further numerical analyses developed by considering different values of the geometry curvature and mechanical properties of the Interface, are subsequently developed with the main goal to check the reliability of the proposed formulas.

Warren Mitchell - One of the best experts on this subject based on the ideXlab platform.

  • computer vision system for froth middlings Interface Level detection in the primary separation vessels
    Computers & Chemical Engineering, 2019
    Co-Authors: Agustin Vicente, Biao Huang, Rahul Raveendran, Shabnam Sedghi, Anuj Narang, Hailei Jiang, Warren Mitchell
    Abstract:

    Abstract Bitumen from the surface-mined oil sands is separated through a water-based gravity separation process in the Primary Separation Vessels (PSV). The froth-middlings Interface Level in the PSVs is the most important control variable in the process. Bitumen recovery and downstream operations are critically dependent on the Interface Level measurement and control. In this paper, we describe a robust computer vision system that uses image and data processing techniques to estimate the froth-middlings Interface Level. The algorithm in the computer vision system processes the online video frames of a camera mounted to the PSV sight glasses, and it is based on a combination of static and dynamic image processing steps. Industrial results show that the computer vision algorithm is more accurate and reliable when compared to the other instruments, as well as robust against process and environmental abnormalities.

Wuqiang Yang - One of the best experts on this subject based on the ideXlab platform.

  • multi Interface Level sensors and new development in monitoring and control of oil separators
    Sensors, 2006
    Co-Authors: Syed Faisal Ahmed Bukhari, Wuqiang Yang
    Abstract:

    In the oil industry, huge saving may be made if suitable multi-Interface Level measurement systems are employed for effectively monitoring crude oil separators and efficient control of their operation. A number of techniques, e.g. externally mounted displacers, differential pressure transmitters and capacitance rod devices, have been developed to measure the separation process with gas, oil, water and other components. Because of the unavailability of suitable multi-Interface Level measurement systems, oil separators are currently operated by the trial-and-error approach. In this paper some conventional techniques, which have been used for Level measurement in industry, and new development are discussed.