Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
Full Text
Peer Reviewed
See detailComputer simulation of a bivalent heating installation
Nicolas, Jacques ULg; Poncelet, Jean-Pol

in Energy (1986), 11(6), 551-562

A computer simulation program for a dwelling heating installation has been developed and tested. It uses principles and defined parameters, with simplifications to reduce the program size and execution ... [more ▼]

A computer simulation program for a dwelling heating installation has been developed and tested. It uses principles and defined parameters, with simplifications to reduce the program size and execution time. Integration of the differential equations describing the heat transfer in the system is performed with constant time steps (explicit scheme). The program is utilized to study the performance of the heating system and to perform parametric studies to determine the effects of changes in various parameters on performance. The influence of the time increment, thermal insulation, heat capacity and of other parameters on system performance has been analyzed. Included in the regulation software of a control system, the program is a design tool to optimize regulation and help in developing and testing modern regulators. [less ▲]

Detailed reference viewed: 39 (1 ULg)
Full Text
Peer Reviewed
See detailComputer simulation of liquid semiconductors
Bichara, C.; Gaspard, Jean-Pierre ULg; Raty, Jean-Yves ULg

in Journal of Non-Crystalline Solids (2002), 312

We discuss two examples of computer simulation of liquid semiconductors by two different techniques. Both examples are concerned with the relationship between thermodynamic properties and the atomic ... [more ▼]

We discuss two examples of computer simulation of liquid semiconductors by two different techniques. Both examples are concerned with the relationship between thermodynamic properties and the atomic structure in the liquid state. By means of ab initio molecular dynamics we analyze the atomic structure of liquid Ge15Te85 eutectic alloys. We show that the changes observed in the experimental total structure factor S(q) are located in the GeTe partial structure factor, the TeTe partial structure factor remaining essentially unaltered. Using a semi-empirical tight binding approach, coupled with Gibbs ensemble and constant pressure Monte Carlo calculations, we can calculate the liquid vapor equilibrium of selenium. We obtain a liquid-vapor equilibrium curve and a critical point in the correct range of magnitude and an atomic structure of the liquid phase in good agreement with the experimental data. (C) 2002 Elsevier Science B.V. All rights reserved. [less ▲]

Detailed reference viewed: 30 (1 ULg)
Full Text
Peer Reviewed
See detailComputer Simulation Of Surfactin Conformation At A Hydrophobic/Hydrophilic Interface
Gallet, X.; Deleu, Magali ULg; Razafindralambo, Hary ULg et al

in Langmuir (1999), 15(7), 2409-13

Using a molecular modeling method, different conformations of surfactin at a hydrophobic/hydrophilic interface are established. Two conformations of the peptide ring (S1 and S2) provided by NMR ... [more ▼]

Using a molecular modeling method, different conformations of surfactin at a hydrophobic/hydrophilic interface are established. Two conformations of the peptide ring (S1 and S2) provided by NMR experiments built with three different aliphatic chains in folded or extended configurations were studied. For the structures including the S2 peptide ring conformation, the theoretical interfacial molecular area corresponds to the experimental limiting area A0 value obtained with a Langmuir film balance. The peptide ring is positioned in the plane of the interface with the two acidic chains close to each other and protruding in the aqueous phase, and the β-hydroxy fatty acid chain, folded to interact mainly with the Leu2 side chain and also with the Val4 side chain. This design has the largest calculated molecular area and would correspond to the most stable amphipathic structure representing the surfactin experimental behavior in weak compression. [less ▲]

Detailed reference viewed: 20 (0 ULg)
Full Text
See detailComputer simulations of spray retention by a 3D barley plant: effect of formulation surface tension
Massinon, Mathieu ULg; De Cock, Nicolas ULg; Ouled Taleb Salah, Sofiene ULg et al

in 67th International Symposium on Crop Protection (2015, May 19)

Detailed reference viewed: 32 (14 ULg)
Full Text
Peer Reviewed
See detailComputer Simulations of the Sputtering of Metallic, Organic, and Metal−Organic Surfaces with Bin and C60 Projectiles
Delcorte, Arnaud; Leblanc, Christophe ULg; Poleunis, Claude et al

in Journal of Physical Chemistry C: Nanomaterials, Interfaces, and Hard Matter (2013), 117

This study focuses on the microscopic modeling of 0–25 keV Bi1–3–5 and C60 cluster impacts on three different targets (Au crystal, adsorbed Au nanoparticle, and organic solid), using molecular dynamics ... [more ▼]

This study focuses on the microscopic modeling of 0–25 keV Bi1–3–5 and C60 cluster impacts on three different targets (Au crystal, adsorbed Au nanoparticle, and organic solid), using molecular dynamics simulations, and on the comparison of the calculated quantities with recent experimental results, reported in the literature or obtained in our laboratory. The sputtering statistics are reported, showing nonlinearity of the sputtering yields with the number of cluster atoms at the same incident velocity for Bi1–5 bombardment. They are compared to experiments (especially for the organic target), and the microscopic explanation of the observations is analyzed. The results show that the respective behaviors and performances of the different projectiles are strongly dependent on the target, with clusters of heavy Bi atoms being more efficient at sputtering gold and, conversely, fullerene clusters inducing the largest sputtering yields of the organic material (mass matching). For organic targets, some important and novel conclusions of this work are the following: (i) The increase of the sputtering yield when going from Bi atoms to Bi clusters is insufficient to explain the much larger increase of characteristic ion yields, suggesting a projectile-dependent ionization probability. (ii) The extent of molecular fragmentation follows the order of Bi > Bi3 > Bi5 > C60, that is, softer emission with larger clusters. (iii) Even 5–10 keV Bi atoms create collective molecular motions and craters in the polymeric solid, though the collision cascades are rather dilute. Finally, a second series of simulations performed at low energies predict that 0.1–1 keV Bin clusters should not provide better results for sputtering and depth profiling than isoenergetic single atoms. [less ▲]

Detailed reference viewed: 21 (13 ULg)
See detailComputer Simulations of Ultrafast Magnetisation Reversal
Ostler, Thomas ULg

Doctoral thesis (2012)

Detailed reference viewed: 6 (1 ULg)
Full Text
See detailComputer Vision
Van Droogenbroeck, Marc ULg

Learning material (2015)

Detailed reference viewed: 823 (219 ULg)
See detailComputer Vision Systems: Seventh International Conference
Fritz, Mario; Schiele, Bernt; Piater, Justus ULg

Book published by Springer (2009)

Detailed reference viewed: 7 (0 ULg)
See detailComputer Vision Systems: Third International Conference
Crowley, James; Piater, Justus ULg; Vincze, Markus et al

Book published by Springer (2003)

Detailed reference viewed: 12 (0 ULg)
Full Text
See detailComputer-aided analysis of rigid and flexible multibody systems
Verlinden, Olivier; Bruls, Olivier ULg; Conti, Calogero et al

Learning material (2007)

Detailed reference viewed: 108 (17 ULg)
Full Text
Peer Reviewed
See detailComputer-Aided Design of Redundant Sensor Networks
Heyen, Georges ULg; Dumont, Marie-Noëlle ULg; Kalitventzeff, Boris ULg

Poster (2002, May)

A systematic method to design sensor networks able to identify key process parameters with a required precision at a minimal cost is presented. The procedure is based on a linearised model, derived ... [more ▼]

A systematic method to design sensor networks able to identify key process parameters with a required precision at a minimal cost is presented. The procedure is based on a linearised model, derived automatically from a rigorous non-linear data reconciliation model. A genetic algorithm is used to select the sensor types and locations. [less ▲]

Detailed reference viewed: 25 (7 ULg)
Full Text
Peer Reviewed
See detailComputer-aided integrated design for machines with varying dynamics
da Silva, Maira M; Bruls, Olivier ULg; Swevers, Jan et al

in Mechanism & Machine Theory (2009), 44(9), 1733-1745

This paper discusses the integrated design of mechatronic systems with varying dynamics, such as serial and parallel machine tools. This characteristic affects the machine stability and performance. A ... [more ▼]

This paper discusses the integrated design of mechatronic systems with varying dynamics, such as serial and parallel machine tools. This characteristic affects the machine stability and performance. A computer-aided integrated design methodology is proposed and validated on a pick-and-place robot. It consists of two main steps: (i) the derivation of reduced models from a flexible multibody model and (ii) the systematic robust control design. Eventually, the integrated design of the system, considering both structural and control parameters, can be performed. [less ▲]

Detailed reference viewed: 37 (2 ULg)
Full Text
See detailComputer-aided integrated design for mechatronic systems with configuration-dependent dynamics
da Silva, Maira M; Bruls, Olivier ULg; Desmet, Wim et al

Conference (2008, May)

Mechatronics deals with the integrated design of a mechanical system and its control system. Moreover, a large number of mechatronic systems may have their natural frequencies and mode shapes dependent on ... [more ▼]

Mechatronics deals with the integrated design of a mechanical system and its control system. Moreover, a large number of mechatronic systems may have their natural frequencies and mode shapes dependent on their spatial configuration, which inevitably affects the performance and the stability of the control system. In particular, mechatronic systems, such as machine tools and pick-and-place robots, can be classified as systems with configuration-dependent dynamics, since the relative motion between their flexible components can lead to time-varying boundary conditions. A parametric model able to capture this behavior is proposed using finite element based flexible multibody method. A global modal parameterization is applied for model-order reduction. A linear parameter varying model is derived from these reduced models and can be used in a control design scheme. This methodology is applied to a pick-and-place assembly robot with a gripper carried by a flexible beam (Fig. 1a). Vibrations, which depend on the beam length, decrease the throughput of the machine (Fig. 1b). Linear time invariant and linear parameter varying control strategies are evaluated using the derived linear parameter varying model. [less ▲]

Detailed reference viewed: 61 (0 ULg)
Full Text
See detailComputer-aided integrated design for mechatronic systems with varying dynamics
da Silva, Maira M; Bruls, Olivier ULg; Paijmans, Bart et al

in Ulbrich, Heinz; Ginzinger, Lucas (Eds.) Motion and Vibration Control (Selected Papers from MOVIC 2008) (2009)

Some mechatronic systems have different spatial configurations or operation positions, and, as a consequence, their dynamic behavior, described by their most significant eigenfrequencies and mode-shapes ... [more ▼]

Some mechatronic systems have different spatial configurations or operation positions, and, as a consequence, their dynamic behavior, described by their most significant eigenfrequencies and mode-shapes, may vary in the configuration space. This inevitably affects the performance and the stability of the control system. Regarding the design of mechatronic systems with variable configuration, two main issues are treated in this paper: (i) the derivation of a parametric model able to capture the varying dynamics and the control actions, (ii) the integrated design of the structure and the controller. To cope with these issues, a parametric model is derived using a flexible multibody system technique based on the finite element method. A global modal parameterization is applied for model-order reduction, yielding a concise description of the flexible multibody model. A linear parameter varying controller is derived via interpolation of local controllers for the reduced models. This methodology is applied to a pick-and-place assembly robot with a gripper carried by a flexible beam. Eventually, design tradeoffs are evaluated considering the performance of the active system for different structural configurations. [less ▲]

Detailed reference viewed: 78 (2 ULg)
Full Text
Peer Reviewed
See detailComputer-Aided Tissue Engineering of the Anterior Cruciate Ligament
Laurent, Cédric ULg

in Journal of Biomechanics (2012)

Detailed reference viewed: 24 (0 ULg)
Full Text
Peer Reviewed
See detailComputer-Aided Tissue Engineering: application to the case of Anterior Cruciate Ligament Repair
Laurent, Cédric ULg; DURVILLE, D; VAQUETTE, C et al

in Lecca, Paola (Ed.) Biomechanics of Cells and Tissues: Experiments, Models and Simulations (2012)

Detailed reference viewed: 25 (0 ULg)
See detailComputer-Aided Verification, Proc. 7th Int. Conference
Wolper, Pierre ULg

Book published by Springer-Verlag (1995)

Detailed reference viewed: 11 (0 ULg)
See detailComputer-assisted tomography for liquid imaging in trickle-flow columns
Toye, Dominique ULg; Marchot, Pierre ULg; Crine, Michel ULg et al

in Non-invasive Monitoring of Multiphase Flows (1996)

Detailed reference viewed: 9 (1 ULg)