7 research outputs found

    Mise en Place d’Une Méthodologie d’Etude de la Vulnérabilité à l’Effondrement des Cavités de l’Ancienne Médina de Béni Mellal, Maroc

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    Le recensement des cavitĂ©s dans les zones urbanisĂ©es est indispensable pour empĂŞcher la survenue de diverses causes de dommages liĂ©s Ă  d'Ă©ventuels effondrements. Les cavitĂ©s constituent Ă©galement des cibles privilĂ©giĂ©es pour les archĂ©ologues, car les vides laissĂ©s dans l'oubli sont des foyers potentiels de matĂ©riaux dĂ©voilant des usages antĂ©rieurs. Ces cavitĂ©s sont de tailles variĂ©es, leur origine est humaine ou non, dans des milieux externes ou sous des structures. Leur dimension, ainsi que les caractĂ©ristiques physiques du milieu extĂ©rieur dans lequel elles se trouvent, permettent l'utilisation de mĂ©thodes gĂ©ophysiques diffĂ©rentes. Nous avons mis l'accent sur l'utilisation de deux mĂ©thodes gĂ©ophysiques, les sondages Ă©lectriques, la sismique rĂ©fraction et la tomographie par mesures de rĂ©sistivitĂ© Ă©lectrique, pour localiser et dĂ©terminer les cavitĂ©s situĂ©es dans l’ancienne ville de BĂ©ni Mellal. Ce travail a pour objectif de procĂ©der Ă  Ă©tablir une carte de vulnĂ©rabilitĂ© des cavitĂ©s Ă  l’effondrement dans l’ancienne mĂ©dina de BĂ©ni Mellal en appliquant la dĂ©marche d’analyse multicritère et la modĂ©lisation par Ă©lĂ©ments finis pour dĂ©terminer les poids des paramètres dĂ©terminants de la vulnĂ©rabilitĂ©.   Identifying cavities in urbanized areas is essential to prevent the occurrence of various causes of damage linked to possible collapses. Cavities are also prime targets for archaeologists, as forgotten voids are potential sources of materials revealing past uses. These cavities vary in size, originating from human or non-human sources, in external environments or beneath structures. Their size, as well as the physical characteristics of the external environment in which they are found, allow the use of different geophysical methods. We have focused on the use of two geophysical methods, electrical sounding, seismic refraction and electrical resistivity tomography, to locate and determine cavities located in the ancient city of BĂ©ni Mellal. The aim of this work is to draw up a vulnerability map of cavities to collapse in the old medina of BĂ©ni Mellal, applying a multi-criteria analysis approach and finite element modelling to determine the weights of the parameters determining vulnerability

    Mise en Place d’Une Méthodologie d’Etude de la Vulnérabilité à l’Effondrement des Cavités de l’Ancienne Médina de Béni Mellal, Maroc

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    Le recensement des cavitĂ©s dans les zones urbanisĂ©es est indispensable pour empĂŞcher la survenue de diverses causes de dommages liĂ©s Ă  d'Ă©ventuels effondrements. Les cavitĂ©s constituent Ă©galement des cibles privilĂ©giĂ©es pour les archĂ©ologues, car les vides laissĂ©s dans l'oubli sont des foyers potentiels de matĂ©riaux dĂ©voilant des usages antĂ©rieurs. Ces cavitĂ©s sont de tailles variĂ©es, leur origine est humaine ou non, dans des milieux externes ou sous des structures. Leur dimension, ainsi que les caractĂ©ristiques physiques du milieu extĂ©rieur dans lequel elles se trouvent, permettent l'utilisation de mĂ©thodes gĂ©ophysiques diffĂ©rentes. Nous avons mis l'accent sur l'utilisation de deux mĂ©thodes gĂ©ophysiques, les sondages Ă©lectriques, la sismique rĂ©fraction et la tomographie par mesures de rĂ©sistivitĂ© Ă©lectrique, pour localiser et dĂ©terminer les cavitĂ©s situĂ©es dans l’ancienne ville de BĂ©ni Mellal. Ce travail a pour objectif de procĂ©der Ă  Ă©tablir une carte de vulnĂ©rabilitĂ© des cavitĂ©s Ă  l’effondrement dans l’ancienne mĂ©dina de BĂ©ni Mellal en appliquant la dĂ©marche d’analyse multicritère et la modĂ©lisation par Ă©lĂ©ments finis pour dĂ©terminer les poids des paramètres dĂ©terminants de la vulnĂ©rabilitĂ©.   Identifying cavities in urbanized areas is essential to prevent the occurrence of various causes of damage linked to possible collapses. Cavities are also prime targets for archaeologists, as forgotten voids are potential sources of materials revealing past uses. These cavities vary in size, originating from human or non-human sources, in external environments or beneath structures. Their size, as well as the physical characteristics of the external environment in which they are found, allow the use of different geophysical methods. We have focused on the use of two geophysical methods, electrical sounding, seismic refraction and electrical resistivity tomography, to locate and determine cavities located in the ancient city of BĂ©ni Mellal. The aim of this work is to draw up a vulnerability map of cavities to collapse in the old medina of BĂ©ni Mellal, applying a multi-criteria analysis approach and finite element modelling to determine the weights of the parameters determining vulnerability

    Etude de la Vulnérabilité à l’Effondrement des Cavités de l’Ancienne Médina de Béni Mellal, Maroc

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    Le recensement des cavitĂ©s dans les zones urbanisĂ©es est indispensable pour empĂŞcher la survenue de diverses causes de dommages liĂ©s Ă  d'Ă©ventuels effondrements. Les cavitĂ©s constituent Ă©galement des cibles privilĂ©giĂ©es pour les archĂ©ologues, car les vides laissĂ©s dans l'oubli sont des foyers potentiels de matĂ©riaux dĂ©voilant des usages antĂ©rieurs. Ces cavitĂ©s sont de tailles variĂ©es, leur origine est humaine ou non, dans des milieux externes ou sous des structures. Leur dimension, ainsi que les caractĂ©ristiques physiques du milieu extĂ©rieur dans lequel elles se trouvent, permettent l'utilisation de mĂ©thodes gĂ©ophysiques diffĂ©rentes. Nous avons mis l'accent sur l'utilisation de deux mĂ©thodes gĂ©ophysiques, les sondages Ă©lectriques, la sismique rĂ©fraction et la tomographie par mesures de rĂ©sistivitĂ© Ă©lectrique, pour localiser et dĂ©terminer les cavitĂ©s situĂ©es dans l’ancienne ville de BĂ©ni Mellal. Ce travail a pour objectif de procĂ©der Ă  Ă©tablir une carte de vulnĂ©rabilitĂ© des cavitĂ©s Ă  l’effondrement dans l’ancienne mĂ©dina de BĂ©ni Mellal en appliquant la dĂ©marche d’analyse multicritère et la modĂ©lisation par Ă©lĂ©ments finis pour dĂ©terminer les poids des paramètres dĂ©terminants de la vulnĂ©rabilitĂ©. En effet la combinaison des rĂ©sultats ont permis de caractĂ©riser les zones les cavitĂ©s souterraines, correspondants Ă  des cavitĂ©s ou des karsts. La carte de vulnĂ©rabilitĂ© aux effondrements de ces cavitĂ©s permettrait de circonscrire les principaux secteurs menacĂ©s, d’apprĂ©hender les dĂ©gâts, les Ă©viter ou les rĂ©duire. Elle pourrait servir comme outil de base pour le traitement des cavitĂ©s.               The Geological and Geophysical study Inventories of cavities in urbanised areas are essential to prevent the occurrence of various causes of damage linked to possible collapses. Cavities are also prime targets for archaeologists, as forgotten voids are potential sources of materials revealing past uses. These cavities come in all shapes and sizes, and are of human or non-human origin, in external environments or beneath structures. Their size, as well as the physical characteristics of the external environment in which they are found, mean that different geophysical methods can be used. We have focused on the use of two geophysical methods, electrical soundings, seismic refraction and tomography using electrical resistivity measurements, to locate and determine the cavities located in the old town of BĂ©ni Mellal. The aim of this work is to draw up a map of the vulnerability of cavities to collapse in the old medina of BĂ©ni Mellal by applying the multi-criteria analysis approach and finite element modelling to determine the weights of the parameters determining vulnerability.Indeed, the combined results have made it possible to characterise the subsurface hazard zones, corresponding to cavities or karsts. The map of vulnerability to collapse of these cavities would make it possible to identify the main areas at risk, to assess the damage, and to avoid or reduce it. It could serve as a basic tool for the treatment of cavities

    Carcinome cutané de Merkel: apport de la TEP-TDM au18FDG

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    Le carcinome à cellules de Merkel (CCM) est une tumeur cutanée neuroendocrinerare d'évolution imprévisible et à grand potentiel métastatique. Ce néoplasme survient habituellement chez le sujet âgé au niveau des zones photo exposées. L'avidité constante du CCM au 18 fluorodésoxyglucose (FDG) justifie l'intérêt de la tomographie par émission de positon (TEP) au cours de cette pathologie. Toutefois, aucun consensus n'est établi à ce jour. Cette étude rapporte le cas d'une patiente de 25 ans suivie pour CCM métastatique, afin d'attirer l'attention sur cette tumeur particulière et d'illustrer l'intérêt de la TEP au 18 FDG dans la prise en charge de cette entité rare.Pan African Medical Journal 2016; 2

    Assessment of the Vulnerability to Potential Collapse of Buildings in the Old Medina of Beni-Mellal-MOROCCO

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    The application of specialized natural hazard mapping is an absolute necessity for the management and prevention of natural hazard events. This paper treats the description of all the procedures carried out in order to produce a map of vulnerability and susceptibility to cave-ins, calculated and evaluated by the multicriteria method (AHP) and by using the GIS tool in the old Medina of Beni Mellal, which is recognized from time to time by cave-ins. The objective of this study is to develop a new method for analyzing the vulnerability of cavities to collapse, which presents a real risk in the urban area of the old cities. The methodology, applied to the old city of Beni-Mellal, consists in identifying and quantifying the stakes linked to the collapse of a cavity using a geographic information system. The weight of each parameter and factor exposed in the vulnerability was estimated using the hierarchical multicriteria method (AHP). The result is presented in the form of a spatialized and synthetic vulnerability map. The detection, mapping and assessment of areas vulnerable to the collapse of these cavities, particularly for large areas of the city, offers the possibility of reducing damage by intervening upstream and introducing preventive and corrective measures against any risk of collapse in the areas deemed vulnerable by our study. The maps show three zones with different degrees of vulnerability. The low and medium vulnerability zones occupy respectively 30 and 20% of the total area of the old city, while the high and very high vulnerability zones occupy respectively 16% and 4%

    Low incidence of SARS-CoV-2, risk factors of mortality and the course of illness in the French national cohort of dialysis patients

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    International audienceThe aim of this study was to estimate the incidence of COVID-19 disease in the French national population of dialysis patients, their course of illness and to identify the risk factors associated with mortality. Our study included all patients on dialysis recorded in the French REIN Registry in April 2020. Clinical characteristics at last follow-up and the evolution of COVID-19 illness severity over time were recorded for diagnosed cases (either suspicious clinical symptoms, characteristic signs on the chest scan or a positive reverse transcription polymerase chain reaction) for SARS-CoV-2. A total of 1,621 infected patients were reported on the REIN registry from March 16th, 2020 to May 4th, 2020. Of these, 344 died. The prevalence of COVID-19 patients varied from less than 1% to 10% between regions. The probability of being a case was higher in males, patients with diabetes, those in need of assistance for transfer or treated at a self-care unit. Dialysis at home was associated with a lower probability of being infected as was being a smoker, a former smoker, having an active malignancy, or peripheral vascular disease. Mortality in diagnosed cases (21%) was associated with the same causes as in the general population. Higher age, hypoalbuminemia and the presence of an ischemic heart disease were statistically independently associated with a higher risk of death. Being treated at a selfcare unit was associated with a lower risk. Thus, our study showed a relatively low frequency of COVID-19 among dialysis patients contrary to what might have been assumed

    Low incidence of SARS-CoV-2, risk factors of mortality and the course of illness in the French national cohort of dialysis patients

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