Search results for "mecA"
showing 10 items of 475 documents
Analysis of evaporative flux data for various climates
1992
International audience
Defining a reduced volume zone for the simulation of burst test on a composite pressure vessels
2018
International audience; A Fibre-Break Model (FBM) developed at Mines ParisTech can predict the burst pressure of high pressure composite vessels. This model uses random values of fibre strength at each Gauss point of the considered vessels meshed with finite element (FE). However, previous studies has determined the optimum FEs to be used on real-scale structures (0.1 mm x 0.1 mm x 8 mm). A simple calculation shows that, on a real-scale pressure vessel, this induces a gigantic number of FEs, hence the extensive computation time. To overcome this problem, the integral range method is proposed to find a reduced volume zone of the vessels, on which an equivalent calculation can be made and giv…
Influence du vieillissement hygrothermique sur la tenue à l'impact de stratifiés quasi-isotropes/quasi homogènes
2011
International audience; La présente étude a pour objectif de déterminer l'influence du vieillissement hygrothermique sur la tolérance à l'impact de stratifiés possédant des propriétés particulières d'isotropie. Trois stratifications de 24 plis carbone/époxy ont été étudiées. Deux d'entre elles conduisent à des propriétés d'isotropie en membrane et en flexion, la troisième est isotrope en membrane et anisotrope en flexion. Les stratifiés obtenus après cuisson suivant le cycle préconisé par le fabricant ont été découpés pour obtenir des éprouvettes carrées destinées au vieillissement et à l'impact. Le vieillissement a été réalisé grâce à une enceinte climatique à une température de 70 °C sous…
Synthesis of Bulk FeAl nanostructured materials by HVOF spray forming and Spark Plasma Sintering
2006
The application of a reduced volume method for the simulation of the characterisation of a carbon fibre pressure vessel
2018
International audience; The characteristics of advanced composite materials make them ideally suited for use in pressure vessels for storing gas as fuel for ground transport vehicles. It has been found that the failure process starts with randomly distributed fibre breaks and as the loading continues, they coalesce into clusters of fibre breaks which lead to failure [4]. However, improvements are needed to reduce computational times when performing full-scale simulations. The reduced volume method is therefore applied to the stochastic fibre break model related to the concept of an integral range. This method allows the calculation for a certain volume of a laminate that statistically repre…
Microfabrication of hybrid fluid membrane for microengines
2015
International audience; This paper describes the microfabrication and dynamic characterization of thick membranes providing a technological solution for microengines. The studied membranes are called hybrid fluid-membrane (HFM) and consist of two thin membranes that encapsulate an incompressible fluid. This work details the microelectromechanical system (MEMS) scalable fabrication and characterization of HFMs. The membranes are composite structures based on Silicon spiral springs embedded in a polymer (RTV silicone). The anodic bonding of multiple stacks of Si/glass structures, the fluid filling and the sealing have been demonstrated. Various HFMs were successfully fabricated and their dyna…
mecA gēna noteikšana klīniskajos Staphylococcus aureus celmos
2017
Staphylococcus aureus ir viens no galvenajiem nozokomiālo infekciju izraisītājiem daudzās attīstītās pasaules valstīs. S.aureus samērā bieži ir meticilīnrezistents, tas nozīmē, ka tam ir rezistence pret visiem klasiskajiem beta laktāmu antibakteriālajiem līdzekļiem. Meticilīnrezistenci nosaka mecA gēns un tā integrācija baktērijas genomā. Baktēriju rezistences pieauguma dēļ būtiski ir noteikt atbilstošu antibakteriālo līdzekļu terapiju efektīvai ārstēšanai. Darba mērķis ir mecA gēna noteikšana klīniskajos Staphylococcus aureus celmos, kas iegūti no pacientiem, kuri ir ilgstoši uzturējušies veselības aprūpes iestādēs. Darbā tika izmantots GenoType® Staphylococcus tests, lai varētu noteikt me…
Kubrick come brand
2009
Applicazione del metodo Failure Mode, Effects and Criticality Analysis (FMECA) in Tomoterapia: confronto tra approccio classico e metodologia fuzzy
2021
Le analisi di incidenti nel settore radioterapico hanno evidenziato ed evidenziano la necessità di incrementare le misure di garanzia della qualità (QA) a partire dall’identificazione di guasti/errori considerati rari, ma con conseguenze molto severe. In questo ambito, l’applicazione della tecnica Failure Mode, Effects And Criticality Analysis (FMECA) per la classificazione di eventi critici ha riscontrato un grande interesse. Lo scopo del presente lavoro è la comparazione dei risultati ottenuti nell’applicazione di due diverse metodologie FMECA (classica e fuzzy) per la valutazione dei rischi su pazienti sottoposti a trattamenti eseguiti con tomoterapia elicoidale. Il confronto è stato eff…
Contribution to the development and the improvement of a digital model of the human body biofidelic HUByx by numerical methods for impact applications
2017
The study of human tolerance thresholds to impacts requires experiments on living or post mortem human subjects, which naturally raises ethical questions. To overcome these limitations, the development of numerical tools has led over the last few years to the implementation of numerical models more or less capable to accurately reproduce the mechanical behavior of the human body when subjected to various types of stresses. It is in this context that the numerical model HUByx (Hermaphrodite Biomechanics yx-model) has been developed within the research department COMM of the ICB lab at UTBM. This PhD work aims at validating and improving the biofidelity of the thoracic part of the HUByx model…