Coventry University

About: Coventry University is a education organization based out in Coventry, United Kingdom. It is known for research contribution in the topics: Context (language use) & Population. The organization has 4964 authors who have published 12700 publications receiving 255898 citations. The organization is also known as: Lanchester Polytechnic & Coventry Polytechnic.

Nonlinear filtering for state delayed systems with Markovian switching

Abstract: This paper deals with the filtering problem for a general class of nonlinear time-delay systems with Markovian jumping parameters. The nonlinear time-delay stochastic systems may switch from one to the others according to the behavior of a Markov chain. The purpose of the problem addressed is to design a nonlinear full-order filter such that the dynamics of the estimation error is guaranteed to be stochastically exponentially stable in the mean square. Both filter analysis and synthesis problems are investigated. Sufficient conditions are established for the existence of the desired exponential filters, which are expressed in terms of the solutions to a set of linear matrix inequalities (LMIs). The explicit expression of the desired filters is also provided. A simulation example is given to illustrate the design procedures and performances of the proposed method.

Residual stress evaluation in selective-laser-melting additively manufactured titanium (Ti-6Al-4V) and inconel 718 using the contour method and numerical simulation

Abstract: Residual stresses play an important role for the structural integrity of engineering components. In this study residual stresses were determined in titanium alloy (Ti-6Al-4V) and Inconel 718 samples produced using selective-laser-melting (SLM) additive manufacturing. The contour method and a numerical simulation approach (inherent-strain-based method) were used to determine the residual stress distributions. The inherent-strain-based method reduces the computational time compared to weakly-coupled thermo-mechanical simulations. Results showed the presence of high tensile residual stresses at and near the surface of both titanium and Inconel alloys samples, whereas compressive residual stresses were seen at the center region. A good agreement was seen between the results obtained from contour method and the numerical simulation, particularly 1 mm below the surface of the samples.

Distribution of local food activity in England and Wales: An index of food relocalization

Abstract: Ricketts Hein J., Ilbery B. and Kneafsey M. (2006) Distribution of local food activity in England and Wales: an Index of Food Relocalization, Regional Studies 40, 289–301. Despite much interest in the relocalization of the food supply chain in England and Wales, it is unclear whether local food systems are more developed in some areas than others. The aim is to identify current areas of local food activity in England and Wales through the application of an Index of Food Relocalization. The Index is developed by using indicators related to the production and marketing of local food products and results suggest a complex geography associated with such activities. Ricketts Hein J., Ilbery B. et Kneafsey M. (2006) La distribution de la production alimentaire locale en Angleterre et au Pays de Galles: une indice de la relocalisation alimentaire, Regional Studies 40, 289–301. Malgre un vif interet pour la relocalisation de la chaine alimentaire en Angeterre et au Pays de Galles, il n'est pas tout a fait evident...