Kyste hydatique du masséter: a propos d’un cas

La localisation cervico faciale et particulièrement musculaire massétérine est exceptionnelle même en zone d’endémie. Le kyste hydatique au niveau de cette localisation pose un problème de diagnostic et des difficultés thérapeutiques du fait de la présence de filets nerveux du VII. Les auteurs rapportent un cas rare de localisation primaire d’un kyste hydatique au niveau du muscle masséter.Mots clès : Kyste hydatique, face, masséter, imagerie, chirurgie

Mucormycose rhinosinusienne a extension palatine

Les mucormycoses sont des infections fongiques, aigues, rares et souvent fatales. Elles touchent avec prédilection les sujets  immunodéprimés. La forme rhinocérébrale est la plus fréquente. Le diagnostic repose sur l’examen clinique, anatomopathologique et mycologique. L’approche thérapeutique doit être multidisciplinaire. Les auteurs rapportent l’histoire clinique d’un patient, ayant présenté une mucormycose rhinosinusienne avec atteinte du palais au décours d’une infection dentaire. A travers cette observation, ils discutent les différents aspects cliniques, les moyens du diagnostic et les modalités thérapeutiques de la mucormycose rhinocérébrale.Mots clés : Infection fongique, mucormycose rhinocérébrale, zygomycètes, pronostic, traitement

Dynamic substructuring in the medium-frequency range

International audienceThere are several methods in dynamic substructuring for numerical simulation of complex structures in the low-frequency range, that is to say in the modal range. For instance, the Craig-Bampton method is a very efficient and popular method in linear structural dynamics. Such a method is based on the use of the first structural modes of each substructure with fixed coupling interface. In the medium-frequency range, i.e. in the non-modal range, and for complex structures, a large number of structural modes should be computed with finite element models having a very large number of degrees of freedom. Such an approach would not be efficient at all and generally, cannot be carried out. In this paper, we present a new approach in dynamic substructuring for numerical calculation of complex structures in the medium-frequency range. This approach is still based on the use of the Craig-Bampton decomposition of the admissible displacement field but the reduced matrix model of each substructure with fixed coupling interface, which is not constructed using the structural modes, is constructed using the first eigenfunctions of the mechanical energy operator of the substructure with fixed coupling interface related to the medium-frequency band. The method and a numerical example is presented

Dynamic substructuring in the medium-frequency range

International audienceThere are several methods in linear dynamic substructuring for numerical simulation of complex structures in the low-frequency range, that is, in the modal range. For instance, the Craig-Bampton method is a very efficient and popular method. Such a method, based on the use of the first normal structural modes of each undamped substructure with fixed coupling interface, leads to small-sized reduced matrix models. In the medium-frequency range, that is, in the nonmodal range, and for complex structures, a large number of normal structural modes should be computed with finite element models having a very large number of degrees of freedom. Such an approach is not really efficient and, generally, cannot be carried out. We present a new approach in dynamic substructuring for numerical calculation of complex structures in the medium-frequency range. This approach is still based on the use of the Craig-Bampton decomposition of the admissible displacement field, but the reduced matrix model of each substructure with fixed coupling interface is not constructed using the normal structural modes of each undamped substructure but instead using the eigenfunctions associated with the first highest eigenvalues of the mechanical energy operator relative to the medium-frequency band for each damped substructure with fixed coupling interface. The method and numerical example are presented

Dynamic substructuring in the medium-frequency range

International audienceThere are several methods in dynamic substructuring for numerical simulation of complex structures in the low-frequency range, that is to say in the modal range. For instance, the Craig-Bampton method is a very efficient and popular method in linear structural dynamics. Such a method is based on the use of the first structural modes of each substructure with fixed coupling interface. In the medium-frequency range, i.e. in the non-modal range, and for complex structures, a large number of structural modes should be computed with finite element models having a very large number of degrees of freedom. Such an approach would not be efficient at all and generally, cannot be carried out. In this paper, we present a new approach in dynamic substructuring for numerical calculation of complex structures in the medium-frequency range. This approach is still based on the use of the Craig-Bampton decomposition of the admissible displacement field but the reduced matrix model of each substructure with fixed coupling interface, which is not constructed using the structural modes, is constructed using the first eigenfunctions of the mechanical energy operator of the substructure with fixed coupling interface related to the medium-frequency band. The method and a numerical example is presented

Dynamic substructuring in the medium-frequency range

Communication to : ISMA 25 conference, Leuven (Belgium), September 13-15, 2000SIGLEAvailable from INIST (FR), Document Supply Service, under shelf-number : 22419, issue : a.2000 n.210 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc