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Affichage de 851 à 860 sur 1999

Article dans une revue

Razumikhin-type Theorems on Practical Stability of Dynamic Equations on Time Scales

Bacem Ben Nasser, Michael Defoort, Mohamed Djemai, Taous-Meriem Laleg-Kirati

In this work, we investigate some Razumikhin-type criteria for the uniform global practical asymptotic stability on arbitrary time domains, for time-varying dynamic equations. Using Lyapunov-type functions on time scales, we develop appropriate inequalities ensuring that trajectories decay to the...

IFAC-PapersOnLine, 2018, 51 (16), pp.121-126. ⟨10.1016/j.ifacol.2018.08.021⟩. ⟨hal-03671746⟩

Article dans une revue

An Incremental Physically-Based Model of P91 Steel Flow Behaviour for the Numerical Analysis of Hot-Working Processes

Alberto Murillo-Marrodán, Eli Saúl Puchi-Cabrera, Eduardo Garcia, Mirentxu Dubar, Fernando Cortes, Laurent Dubar

This paper is aimed at modelling the flow behaviour of P91 steel at high temperature and a wide range of strain rates for constant and also variable strain-rate deformation conditions, such as those in real hot-working processes. For this purpose, an incremental physically-based model is proposed...

Metals, 2018, 8 (4), pp.269. ⟨10.3390/met8040269⟩. ⟨hal-03450069⟩

Article dans une revue

Mesh Twisting Technique for Swirl Induced Laminar Flow Used to Determine a Desired Blade Shape

Asdis Helgadottir, Sylvain Lalot, François Beaubert, Halldor Pálsson

Swirling flow has been shown to increase heat transfer in heat exchangers. However, producing swirl while not presenting a severe pressure drop can be a challenge. In this paper, a desired shape of guidance blades for laminar swirl flow is determined by numerical simulation in OpenFOAM. Emphasis is...

Applied Sciences, 2018, 8 (10), pp.1865. ⟨10.3390/app8101865⟩. ⟨hal-03449889⟩

Article dans une revue

High performance LDPC codes for high spectral efficiency

Latifa Mostari, Abdelmalik Taleb-Ahmed, Abdennacer Bounoua

Achieving high spectral efficiency is the key requirement of future wireless systems and mobile communications because it provides us a high quality for high data over a limited bandwidth. In order to achieve high spectral efficiency, channel coding and modulation are the key part. Basically, high...

Internetworking Indonesia Journal, 2018, 10 (1), pp.9-15. ⟨hal-03676514⟩

Article dans une revue

Friction coefficients in cold forging: A global perspective

Peter Groche, Philipp Kramer, Niels Bay, Peter Christiansen, Laurent Dubar, K. Hayakawa, Chengliang Hu, K. Kitamura, Philippe Moreau

Worldwide, at least twenty different tribological tests have been proposed for the empirical determination of friction coefficients in cold forging processes. Due to the varying test setups, means of measurement, and level of abstraction, the comparability of the outcomes is, however, disputable....

CIRP Annals - Manufacturing Technology, 2018, 67 (1), pp.261-264. ⟨10.1016/j.cirp.2018.04.106⟩. ⟨hal-03450016⟩

Article dans une revue

Optimization of the maintenance planning of a multi-component system

Issam Mallouk, Badr Abou El Majd, Yves Sallez

The vehicle’s maintenance costs, uptime and security are the most important goals for owners and transport companies, but these goals are conflictual and the major cause for delays is related to the maintenance policies. The main objective of transporters is to respond properly to their customer’s...

MATEC Web of Conferences, 2018, International Workshop on Transportation and Supply Chain Engineering (IWTSCE’18) Rabat, Morocco, May 8-9, 2018, 200, pp.00011. ⟨10.1051/matecconf/201820000011⟩. ⟨hal-03676096⟩

Article dans une revue

Healthcare decision support tool: multi-agent system for bed management

Nesrine Zoghlami, Besma Glaa, Souad Rabah, Mourad Abed

The effective management of the allocation of limited resources such as beds is a key to the delivery of timely, high quality and low cost healthcare. However, an efficient utilisation of beds is not easy to accomplish because of the complexity of the healthcare system and the higher amount of...

International Journal of Applied Management Science, 2018, 10 (1), pp.59-71. ⟨10.1504/IJAMS.2018.10010975⟩. ⟨hal-03400921⟩

Article dans une revue

Timetable rearrangement to cope with railway maintenance activities

Luis Diego Arenas Pimentel, Paola Pellegrini, Said Hanafi, Joaquin Rodriguez

Maintenance activities on the railway infrastructure are necessary to maintain its functionality and availability. Commonly, the maintenance activities are planned first. Then, the timetable is elaborated respecting the unavailability periods caused by the former. However, sometimes unplanned...

Computers and Operations Research, 2018, 95, pp123-138. ⟨10.1016/j.cor.2018.02.018⟩. ⟨hal-01764963⟩

Article dans une revue

An Analysis of Electroplated cBN Grinding Wheel Wear and Conditioning during Creep Feed Grinding of Aeronautical Alloys

Gorka Vidal Irusta, Naiara Ortega, Héctor Bravo, Mirentxu Dubar, Haizea González

Cubic boron nitride (cBN), in addition to diamond, is one of the two superabrasives most commonly used for grinding hard materials such as ceramics or difficult-to-cut metal alloys such as nickel-based aeronautical alloys. In the manufacturing process of turbine parts, electroplated cBN wheels are...

Metals, 2018, 8 (5), pp.350. ⟨10.3390/met8050350⟩. ⟨hal-03451113⟩

Article dans une revue

Reactive Power Dispatch Optimization with Voltage Profile Improvement Using an Efficient Hybrid Algorithm

Zahir Sahli, Abdelatif Hamouda, Abdelghani Bekrar, Damien Trentesaux

This paper presents an efficient approach for solving the optimal reactive power dispatch problem. It is a non-linear constrained optimization problem where two distinct objective functions are considered. The proposed approach is based on the hybridization of the particle swarm optimization method...

Energies, 2018, 11 (8), pp.2134. ⟨10.3390/en11082134⟩. ⟨hal-03428168⟩