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Search Results: 1 - 10 of 22853 matches for " Pascal-André Vendittoli "
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Center of Mass Compensation during Gait in Hip Arthroplasty Patients: Comparison between Large Diameter Head Total Hip Arthroplasty and Hip Resurfacing
Vicky Bouffard,Julie Nantel,Marc Therrien,Pascal-André Vendittoli,Martin Lavigne,Fran?ois Prince
Rehabilitation Research and Practice , 2011, DOI: 10.1155/2011/586412
Abstract: Objective. To compare center of mass (COM) compensation in the frontal and sagittal plane during gait in patients with large diameter head total hip arthroplasty (LDH-THA) and hip resurfacing (HR). Design. Observational study. Setting. Outpatient biomechanical laboratory. Participants. Two groups of 12 patients with LDH-THA and HR recruited from a larger randomized study and 11 healthy controls. Interventions. Not applicable. Main Outcome Measures. To compare the distance between the hip prosthetic joint center (HPJC) and the COM. The ratio ( ) and the variability ( ) were compared between groups. Hip flexor, abductor, and adductor muscle strength was also correlated between groups while radiographic measurements were correlated with the outcome measures. Results. In the frontal plane, HR shows less variability than healthy controls at push-off and toe-off and is correlated with the muscle strength ratios ( ) at heel contact, maximal weight acceptance, and mid stance. In the sagittal plane, LDH-THA has a higher than healthy controls at push-off, and is significantly correlated with . Conclusions. One year after surgery, both groups of patients, LDH-THA and HR, demonstrate minor compensations at some specific instant of the gait cycle, in both frontal and sagittal planes. However, their locomotion pattern is similar to the healthy controls. 1. Introduction Hip arthroplasty has become a standard procedure [1–3] to improve quality of life [4], restore physical capacities, relieve patients from pain [5, 6], and provide better hip function [5, 7] and stability [8]. Since younger patients are now more frequently affected by osteoarthritis (OA) [9], expectations of outcome after hip arthroplasty have changed. Indeed, patients not only want to get back to their daily living activities but also wish to return to a high level of physical activity [10], as soon as possible. The techniques available to treat the young patients with advanced OA, include, among others, total hip arthroplasty (THA) and hip resurfacing (HR). During THA procedure, a stem is inserted in the femoral canal while the femoral head and neck are resected and replaced by a femoral head of 28?mm diameter, articulating with a cup inserted in the acetabulum cavity (Figure 1(a)). Over the years, THA has proved its worthiness and is now recognized as an effective, reproducible and frequently used therapeutic option [11–13]. As for HR technique, the femoral head and acetabulum are shaped and covered with implants, using a large diameter femoral head size. This technique preserved more bone and became
Spirometric Reference Equations for Semi-Urban and Urban Bantu Cameroonians  [PDF]
Eric Walter Pefura-Yone, Nadine Fleurette Kanko-Nguekam, André Pascal Kengne, Adamou Dodo Balkissou, André Noseda, Christopher Kuaban
Open Journal of Respiratory Diseases (OJRD) , 2013, DOI: 10.4236/ojrd.2013.34025
Abstract: Background: Spirometric reference values vary substantially across ethnic groups, and remain largely poorly characterized among Africans. We derived spirometric reference equations for adult Cameroonians and compared their performance with those derived from other ethnic groups. Methods: Spirometric variables according to the American Thoracic Society/European Respiratory Society 2005 guidelines were acquired in voluntary healthy non-smoker subjects in Yaounde (Capital City) and Foumbot (semi-urban area in West Region), in Cameroon during November 2011 to January 2012 (Yaounde) and August 2012 (Foumbot). Reference equations were derived separately for men and women from multiple linear regressions. Results: A total of 411 subjects (206 men) met the inclusion criteria. The mean age was 39.5 ± 16.1 years (min - max: 18 - 85 years) for men and 39.2 ± 14.1 years (18 - 90 years) for women. Age and height were the only variables significantly associated with spirometric values in the final linear regression models. Derived reference values were lower than those derived from Global Lung Initiative 2012 equations for different ethnic groups, except for the forced expiratory volume in 1 second/forced vital capacity ratio (FEV1/FVC ratio). The mean FEV1/FVC ratio was 0.88 ± 0.07 for Cameroonian men and 0.89 ± 0.07 for Cameroonian women. Variations in the performance of derived models in bootstrap internal validation were marginal. Conclusion: This study highlights the importance of deriving specific predictive equations for each ethnic group. The use of adjustment factors applied to Caucasian equations when compared with the values derived in our study leads to an overestimation of the values for FEV1 and FVC.
Multilevel Contracts for Trusted Components
Mohamed Messabihi,Pascal André,Christian Attiogbé
Electronic Proceedings in Theoretical Computer Science , 2010, DOI: 10.4204/eptcs.37.6
Abstract: This article contributes to the design and the verification of trusted components and services. The contracts are declined at several levels to cover then different facets, such as component consistency, compatibility or correctness. The article introduces multilevel contracts and a design+verification process for handling and analysing these contracts in component models. The approach is implemented with the COSTO platform that supports the Kmelia component model. A case study illustrates the overall approach.
Ichneumonid wasps from Madagascar. VI. The genus Pristomerus (Hymenoptera: Ichneumonidae: Cremastinae)
Pascal Rousse,Claire Villemant,André Seyrig
European Journal of Taxonomy , 2013, DOI: 10.5852/ejt.2013.49
Abstract: Pristomerus species of Madagascar are revised. We report 15 species, of which 12 are newly described: P. guinness sp. nov., P. hansoni sp. nov., P. kelikely sp. nov., P. keyka sp. nov., P. moramora sp. nov., P. melissa sp. nov., P. patator sp. nov., P. ranomafana sp. nov., P. roberti sp. nov., P. vahaza sp. nov., P. veloma sp. nov. and P. yago sp. nov. Pristomerus albescens (Morley) and P. cunctator Tosquinet are newly recorded from Madagascar and new host and/or distribution records are provided for this species. A dichotomous key to all species is provided. The zoogeographical relation of the Malagasy fauna of Pristomerus with respect to mainland Africa is discussed: only three of the 15 species are reported to occur outside of Madagascar, suggesting a high level of endemism in Madagascar which was not unexpected.
Overview on Studies of Martian Like Co2-N2 Mixture by Inductively Coupled Plasma Torch
Damien Vacher,Pascal André,Michel Dudeck
Physics , 2009,
Abstract: The purpose of the work is to make an overview on the results obtained through the studies on martian plasmas created by inductively coupled plasma torches (ICP). As the main advantage of the ICP torch is the absence of electrode compared to the others various test facilities, the radiative properties of this kind of plasmas are of interest to propose test cases in order to validate radiation models. ICP torches can work under various operating conditions in terms of pressure, enthalpy or flow. As a consequence, the studied plasma can be either at thermodynamical equilibrium or out of equilibrium, without problems of stability in time. The presentation concerns only the plasmas formed with a martian like CO2-N2 mixture and all the parameters of test facilities will be precised. The following paper corresponds to the first step of a global paper which will be proposed later and it reports only the oral presentation which has been done during the third International Workshop of RHTG.
Numerical calculation of the transport coefficients in thermal plasmas
Ali Mahfouf,Pascal André,Géraldine Faure
Physics , 2015,
Abstract: -We have performed a new efficient method to calculate numerically the transport coefficients at high temperature. The collision theory was treated to study singularities that occur when evaluating the collision cross section. The transport coefficients (viscosity, diffusion coefficient, thermal and electrical conductivity) depend strongly on nature of the interaction between the particles that form the plasma and that is why it is necessary to determine the interaction potential accurately.
Efficient periodic band diagram computation using a finite element method, Arnoldi eigensolver and sparse linear system solver
Romain Garnier,André Barka,Olivier Pascal
Physics , 2014, DOI: 10.1016/j.cpc.2013.02.011
Abstract: We present here a Finite Element Method devoted to the simulation of 3D periodic structures of arbitrary geometry. The numerical method based on ARPACK and PARDISO libraries, is discussed with the aim of extracting the eigenmodes of periodical structures and thus establishing their frequency band gaps. Simulation parameters and the computational optimization are the focus. Resolution will be used to characterize EBG (Electromagnetic Band Gap) structures, such as plasma rods and metallic cubes.
CLT in Functional Linear Regression Models
Hervé Cardot,André Mas,Pascal Sarda
Mathematics , 2005,
Abstract: We propose in this work to derive a CLT in the functional linear regression model to get confidence sets for prediction based on functional linear regression. The main difficulty is due to the fact that estimation of the functional parameter leads to a kind of ill-posed inverse problem. We consider estimators that belong to a large class of regularizing methods and we first show that, contrary to the multivariate case, it is not possible to state a CLT in the topology of the considered functional space. However, we show that we can get a CLT for the weak topology under mild hypotheses and in particular without assuming any strong assumptions on the decay of the eigenvalues of the covariance operator. Rates of convergence depend on the smoothness of the functional coefficient and on the point in which the prediction is made.
Suitability of Foumban Clays (West Cameroon) for Production of Bricks and Tiles  [PDF]
Abiba Mefire Nkalih, Pascal Pilate, Rose Fouateu Yongue, André Njoya, Nathalie Fagel
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2018, DOI: 10.4236/jmmce.2018.62018
Abstract: Particle size analysis, Atterberg limits, X-ray diffraction, X-ray fluorescence and firing tests were used to determine physico-chemical, mineralogical and technological characteristics of residual lateritic (K1M, Ma2) and alluvial (KB3, KG3) clays from Foumban (West-Cameroon). For technological properties, the samples were pressed and fired over a temperature range of 900°C - 1200°C to determine the open porosity, linear shrinkage, bulk density and compressive strength. Kaolinite (31% - 65%) and quartz (35% - 50%) are dominant in Foumban clays with accessory K-feldspar, plagioclase, illite, smectite, rutile, and goethite. But their proportion changes from one sample to another, having a significant effect on the behaviour of the clay materials: highest proportion of quartz (50%) in sample K1M; relative high feldspars (20%) and illite contents (10%) in KB3 and MA2; high smectite content in KG3 (up to 20%). Chemical analyses indicate high SiO2 (49% - 77%) and low Al2O3 (14% - 23%) contents in the four samples, with comparatively low contents of iron oxides (4% - 7% in samples KB3 and KG3, 2.5% in MA2 and ~1.5% in sample K1M). The particle size distribution of the alluvial clays (KG3 and KB3) differs considerably: 7% to 37% of clay fraction, 20% to 78% of silt, and 15% to 58% of sand, while residual clays (K1M and MA2) present on average 12% of clay, 51% of silt and 37% of sand. Two raw clays (KB3 and MA2) can be used for bricks/tiles production without beneficiation or addition. K1M requires some flux addition to decrease the sintering temperature while KG3 presents poor properties due to the combined occurrence of smectite and a high clayey fraction (37%). Such mineralogical composition is responsible for very high plasticity (PI: 50), high shrinkage (LS: 5% - 16%), low porosity (OP: up to 21%) and high flexural strength (FS: 16 - 23 N/mm2) above 1050°C. This last clay is therefore less appropriate for bricks and roofing tiles production since degreasers must be added to the raw material.
Development and assignment of bovine-specific PCR systems for the Texas nomenclature marker genes and isolation of homologous BAC probes
Mathieu Gautier, Pascal Laurent, Hélène Hayes, André Eggen
Genetics Selection Evolution , 2001, DOI: 10.1186/1297-9686-33-2-191
Abstract: (To access the full article, please see PDF)
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