In this paper we investigate the feasibility of using the ultra weak variational formulation (UWVF) to solve the timeharmonic 3D elastic wave propagation problem. The UWVF is a non-polynomial volume based method that uses plane waves as basis functions which reduces the computational burden. More general, the UWVF is a special form of the discontinuous Galerkin method. As a model problem we con...

Techniques for dynamic GOP in video encoding are proposed in this paper. Comparing to the average-sampling of current standard fixed GOP structure, with dynamic GOP the encoder has great freedom in I-, Pand B-frame selection. The dynamic GOP structure keeps temporal importance information of frames in the encoded video, which helps in adaptation to bandwidth decrease and temporal-SNR quality tr...

Introduction. Let a non-ruled surface 5 be referred to its asymptotic net as parametric. As a point Py moves along a curve C\ of S, the tangents at Py to the uand ^-asymptotic curves of 5 describe two ruled surfaces R" and R{> respectively. Let Sp and S, denote arbitrary transversal surfaces of the congruences of uand ^-tangents of S, respectively. The purpose of the present paper is to introdu...

The calpain proteolytic system has an important role in all animal cells, responding to fluctuating levels of Ca” to initiate irreversible limited proteolysis of specific target proteins. The enzyme system has been implicated in a number of physiological and pathological processes’ involving cytoskeletal reorganisation, and in muscle is thought to be involved in fibre differentiation, growth an...

Les modèles mathématiques sont très utiles pour bien comprendre et gérer le risque épidémique, comme l’a illustré leur usage lors de la pandémie Covid-19. Utilisés depuis plus d’un siècle, ils permettent, en proposant une simplification réalité informée par des données, d’explorer large gamme scénarios ...

Distribution of Pand Swaves velocities in the Earth’s inner core suggests that its matter has been quantum entangled since origin Earth and Solar system. This assumption we made allows us to develop model geomagnetic field evolution from start disappearance. Unlike generally accepted dynamo our provides an obvious source energy which is a phase transition thermal, mechanical electrical released...

La pandémie de Covid-19 a placé la santé publique au cœur nos sociétés en révélant une immense vulnérabilité collective, mais elle peine encore à se constituer objet débat public. Pourtant, des défis comme l’inégalité d’accès aux soins, prévention sanitaire, vocation soignants, le réchauffement...

The paper describes a simple global model of MPEG-2 video coders. This global model is defined as a relation between the bitrate and the quantization parameter for individual I-, Pand B-frames. The model has five parameters that depend on image content. Nevertheless it is shown that four of them can be fixed in order to obtain simply one-parameter model which can be used for encoder control. Th...