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3D reconstruction method of the proximal femur and shape correction
No full textThe aim of this work is to present a 3D reconstruction method of the proximal femur shape using contours identification from pairs of 2D X-ray radiographs without any prior acknowledge. 3D personalized model was reconstructed following a processing chain of seven different steps. After localization of the 2D contours on the images and the matching points of these contours, a 3D contour is generated using an algorithm based on a mathematical model. Thus, with a reduced number of pairs of images, we reconstruct a 3D points cloud, which enables obtaining a closed 3D surface. The accuracy of our approach was evaluated by comparing the reconstruction result with the 3D CT-scan reconstruction of cadaveric proximal femur. The estimated error shows that it is possible to rebuild the proximal femur shape from a limited number of radiograph
First passage time method generalization for the estimation of stochastic differential equation parameters
No full textFeasibility study of date (Phoenix dactylifera L.) fruit syrup-based natural jelly using central composite design
No full textFood survey : levels and potential health risks of chromium, lead, zinc and copper content in fruits and vegetables consumed in Algeria
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Synthesis of polypyrrole's support adsorbed on bentonite. applications in wastewater treatment
No full textStudy of the green composite Jute/Epoxy
Get PDFWork presented is interested in the characterization of
the quasistatic mechanical properties and in fatigue of a composite
laminated in jute/epoxy. The natural fibers offer promising prospects
thanks to their interesting specific properties, because of their low
density, but also with their bio-deterioration. Several scientific
studies highlighted the good mechanical resistance of the vegetable
fiber composites reinforced, even after several recycling. Because of
the environmental standards that become increasingly severe, one
attends the emergence of eco-materials at the base of natural fibers
such as flax, bamboo, hemp, sisal, jute. The fatigue tests on
elementary vegetable fibers show an increase of about 60% of the
rigidity of elementary fibers of hemp subjected to cyclic loadings. In
this study, the test-tubes manufactured by the method infusion have
sequences of stacking of 0/90° and ± 45° for the shearing and tensile
tests. The quasistatic tests reveal a variability of the mechanical
properties of about 8%. The tensile fatigue tests were carried out for
levels of constraints equivalent to half of the ultimate values of the
composite. Once the fatigue tests carried out for well-defined values
of cycles, a series of static tests of traction type highlights the
influence of the number of cycles on the quasi-static mechanical
behavior of the laminate jute/epox
Algerian yeast strains : isolation, identification and production of single cell protein from whey with strain candida kefyr
Get PDFIn this study, few samples than soft and baked cheese, yogurt, cow's milk, pasteurized milk and cheese whey were collected from dairy industries in the city of Boumerdes. The samples were cultured on yeast extract glucose chloramphenicol agar (YGCA) media. Twenty yeast strains were isolated from the culture. Ten of theses strains were identified by their morphological and physiological properties. Betagalactosidase activity in the yeast strains showed that a strain Candida kefyr designated as LP1 had highest enzyme activity (up to 5000 EU/ml). To investigate the effectiveness of bat ch submerged fermentation of the yeast C . kefyr in cheese whey, we found that this strain have highest level of single cell protein (SCP), production (up to 19 g/l dry mass cell). The isolated yeast strain was examined for his ability in reduction of the c hemical oxygen demand (COD). So, the results demonstrated a high level of reductio
Evaluation des risques industriels dans le contexte de la fiabilité dynamique
No full textL’évaluation des risques industriels est devenue la clé de la discipline d’engineering de protection. Cette évaluation se base sur la détermination de la fréquence d’excès du dommage qui doit répondre aux exigences indiqués par la réglementation. Ce travail comporte deux types d’analyse, une analyse déterministe chargée de modélisation des processus des réactions chimiques pour les deux cas simplifiés de l’accident de Bhopal et le cas de l’enceinte nucléaire. Et une analyse probabiliste chargée de calculer les fréquences d’excès de dommage. Il ya beaucoup de similitude entre la catastrophe de Bhopal et l’accident du confinement nucléaire concernant l’augmentation brusque et spectaculaire de la pression résultant des réactions exothermiques, en effet par l’exploitation de l’expérience des industries chimique et nucléaire nous avons développé un outil d’analyse neutre et commun servir à modéliser les réactions chimiques, et de suivre l’évolution des paramètres process ( la pression, la température, la masse…….). L’étude vise à transférer et adapter la modélisation des réactions chimiques en utilisant les performances de l’analyse thermo-hydraulique dans le cas du confinement nucléaire, cette analyse est transférée et adapter avec des outils fixes, au cas de l’accident de Bhopal. L’étude montre la faisabilité d’un outil commun et efficace dans les études d’évaluation des risques qui reflètent les relations communes qui peuvent exister en raison de la modélisation des processus dynamiques communes pour les deux cas de la chimie et de nucléair