Relevant bibliographies by topics / FEXI

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Academic literature on the topic 'FEXI'

Author: Grafiati
Published: 4 June 2021
Last updated: 16 February 2022

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Journal articles on the topic "FEXI"

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Monge, Francisco Javier Carmona, Irene Álvarez Angorrilla, Elena Sánchez Aguado, and Felisa Rodríguez Ruiz. "Ulceración rectal como una complicación del uso de sistema de control fecal Fexi-Seal: relato de casos." Revista da Escola de Enfermagem da USP 45, no. 5 (October 2011): 1256–59. http://dx.doi.org/10.1590/s0080-62342011000500032.

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El Sistema Fexi-Seal es un dispositivo desarrollado para proporcionar mejores cuidados a los pacientes críticos con incontinencia fecal. Existen trabajos que demuestran la seguridad y eficacia del dispositivo, siendo escasos los relatos relacionados con eventos adversos. El presente artículo presenta dos casos de pacientes críticos portadores de Fexi-Seal que desarrollaron complicaciones con su uso. El sistema se mostró eficaz para el tratamiento, sin embargo, es necesaria atención especial en su manejo, particularmente en cuanto al alivio periódico de la presión de la ampolla rectal y al posicionamiento correcto de la bolsa colectora en la cama para evitar tracción excesiva. El Sistema Flexi-Seal permite manejar adecuadamente la diarrea en pacientes críticos, mejorando su bienestar y disminuyendo las complicaciones asociadas a ella, aunque se torna necesario aumentar el conocimiento sobre las complicaciones relacionadas con su empleo.
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Pisharody, S., R. Phillips, and C. M. Langton. "Sensitivity of proximal femoral stiffness and areal bone mineral density to changes in bone geometry and density." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 222, no. 3 (March 1, 2008): 367–75. http://dx.doi.org/10.1243/09544119jeim307.

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Areal bone mineral density (aBMD) is the most common surrogate measurement for assessing the bone strength of the proximal femur associated with osteoporosis. Additional factors, however, contribute to the overall strength of the proximal femur, primarily the anatomical geometry. Finite element analysis (FEA) is an effective and widely used computer-based simulation technique for modelling mechanical loading of various engineering structures, providing predictions of displacement and induced stress distribution due to the applied load. FEA is therefore inherently dependent upon both density and anatomical geometry. FEA may be performed on both three-dimensional and two-dimensional models of the proximal femur derived from radiographic images, from which the mechanical stiffness may be predicted. It is examined whether the outcome measures of two-dimensional FEA, two-dimensional, finite element analysis of X-ray images (FEXI), and three-dimensional FEA computed stiffness values of the proximal femur are more sensitive than aBMD to changes in trabecular bone density and femur geometry. It is assumed that if an outcome measure follows known trends with changes in density and geometric parameters, then an increased sensitivity will be indicative of an improved prediction of bone strength. All three outcome measures increased non-linearly with trabecular bone density, increased linearly with cortical shell thickness and neck width, decreased linearly with neck length, and were relatively insensitive to neck-shaft angle. For femoral head radius, aBMD was relatively insensitive, with two-dimensional FEXI and three-dimensional FEA demonstrating a non-linear increase and decrease in sensitivity respectively. For neck anteversion, aBMD decreased non-linearly, whereas both two-dimensional FEXI and three-dimensional FEA demonstrated a parabolic-type relationship, with the maximum stiffness being achieved at an angle of approximately 15°. Multi-parameter analysis showed that all three outcome measures demonstrated their highest sensitivity to a change in cortical thickness. When changes in all input parameters were considered simultaneously, three and two-dimensional FEA had statistically equal sensitivities (0.41 ± 0.20 and 0.42 ± 0.16 respectively, p= ns) that were significantly higher than the sensitivity of aBMD (0.24 ± 0.07; p=0.014 and 0.002 for three-dimensional and two-dimensional FEA respectively). This simulation study suggests that since mechanical integrity and FEA are inherently dependent on anatomical geometry, FEXI stiffness, being derived from conventional two-dimensional radiographic images, may provide an improvement in the prediction of bone strength of the proximal femur than currently provided by aBMD.
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Tayal, S. S. "Effective Collision Strengths of Fine‐Structure Transitions in Fex, Fexi, and Fexiii." Astrophysical Journal 544, no. 1 (November 20, 2000): 575–80. http://dx.doi.org/10.1086/317195.

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Gupta, G. P., and S. S. Tayal. "Effective Collision Strengths for Electron Impact Excitation of Fine‐Structure Levels in Fexi." Astrophysical Journal 510, no. 2 (January 10, 1999): 1078–81. http://dx.doi.org/10.1086/306612.

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Bai, Ruiliang, Zhaoqing Li, Chaoliang Sun, Yi-Cheng Hsu, Hui Liang, and Peter Basser. "Feasibility of filter-exchange imaging (FEXI) in measuring different exchange processes in human brain." NeuroImage 219 (October 2020): 117039. http://dx.doi.org/10.1016/j.neuroimage.2020.117039.

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Pinfield, D. J., F. P. Keenan, M. Mathioudakis, K. G. Widing, P. T. Gallagher, G. P. Gupta, S. S. Tayal, R. J. Thomas, and J. W. Brosius. "Electron Densities in the Coronae of the Sun and Procyon from Extreme‐Ultraviolet Emission Line Ratios in Fexi." Astrophysical Journal 562, no. 1 (November 20, 2001): 566–74. http://dx.doi.org/10.1086/323465.

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Onsgard-Meyer, M. J., R. J. Kerrigan, M. Collins, A. A. Khraibi, and F. G. Knox. "Phosphaturic effect of L-NMMA in the presence of parathyroid hormone." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 271, no. 6 (December 1, 1996): R1477—R1480. http://dx.doi.org/10.1152/ajpregu.1996.271.6.r1477.

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The objective of this study was to examine the effect of NG-monomethyl-L-arginine (L-NMMA) on phosphate excretion in the presence and absence of parathyroid hormone (PTH). Renal clearances were obtained before and during infusion of L-NMMA (15 mg/kg bolus and 500 micrograms.kg-1.min-1 infusion) in Sprague-Dawley rats with intact parathyroid glands (n = 6), in thyroparathyroidectomized (TPTX) rats receiving a constant infusion of PTH-(1-34) (0.01-0.03 U.kg-1.min-1) (n = 11) throughout the experiment, or in TPTX rats, that received an acute infusion of PTH-(1-34) (33 U/kg bolus and 1 U.kg-1.min-1 infusion) after L-NMMA infusion alone (n = 7). In rats with intact parathyroid glands, L-NMMA increased the fractional excretions of phosphate (FEPi) and sodium (FENa) and mean arterial pressure (MAP) (delta 8.6 +/- 1.5%, delta 0.62 +/- 0.1%, and delta 26.7 +/- 4.9 mmHg, respectively; P < 0.05). In TPTX rats receiving a constant infusion of PTH, L-NMMA again increased FEPi, FENa, and MAP (delta 9.5 +/- 3.6%, delta 1.1 +/- 0.4%, and delta 28.4 +/- 4.5 mmHg, respectively; P < 0.05). However, in TPTX rats, L-NMMA alone did not increase FEPi (delta 0.9 +/- 0.3%), whereas the subsequent infusion of PTH with L-NMMA increased FEPi (delta 15.6 +/- 3.1%; P < 0.05). In an additional group of intact and TPTX rats, the fractional excretion of lithium (FELi) was measured as an index of proximal reabsorption. L-NMMA increased FELi in intact rats (delta 13.2 +/- 2.6%; P < 0.05), but not in TPTX rats (delta 4.2 +/- 3.3%). In conclusion, L-NMMA increases phosphate excretion in association with increases in MAP and FENa, and this phosphaturic effect is dependent on the presence of PTH.
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Gąsior, W., and A. Dębski. "Enthalpy of Formation of Intermetallic Phases from Fe-Ni-Ti System. Comparative Studies / Entalpia Tworzenia Faz Międzymetalicznych Z Układu Fe-Ni-Ti. Studia Porównawcze." Archives of Metallurgy and Materials 57, no. 4 (December 1, 2012): 1095–104. http://dx.doi.org/10.2478/v10172-012-0122-4.

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The solution calorimetric method was used for the measurement of the formation enthalpy of the binary FeTi and Fe2Ti intermetallic phases and of the FeNiTi2 phase from the region of the ternary B2 one. The FeNi and FeNiTi2 phases were prepared by levitation melting and the Fe2Ti phase - by melting the metals in a glove-box under high purity argon. The alloys obtained were identified by the X-ray diffraction analysis. The structural study of the alloys with the composition equal to the FeTi and Fe2Ti phase confirmed the mentioned phases mainly in the samples. In the case of the ternary alloy of the composition of the FeNiTi2 phase, a slight amount of iron was also found. The obtained values of the formation enthalpy equal as follows: -27.2±1.3 kJ/mole of atoms, -22.5±1.4 kJ/mole of atoms and -34.2±1.3 kJ/mole of atoms for the Fe2Ti, FeTi and FeNiTi2 phase, respectively.
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Kaito, Chihiro, Akihito Kumamoto, Ryoichi Ono, Yoshio Saito, and Shigeru Morikawa. "Growth of Functional FeTi Clusters Covered with Carbon Layer." Research Letters in Nanotechnology 2008 (2008): 1–3. http://dx.doi.org/10.1155/2008/734940.

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FeTi clusters with a diameter of less than 10 nm and covered with a graphitic layer have been preferentially produced in an gas atmosphere at pressures of 10 and 26.6 kPa by the simultaneous evaporation of Fe and Ti wires from a concave carbon boat. To compare this result with cluster formation in an inert gas atmosphere, the result for an Ar gas pressure of 10 kPa is also discussed. The formation of disordered FeNi clusters predominately took place in an gas atmosphere.
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Mészáros, István, and Gábor Vértesy. "Modelling of Normal Magnetization Curves of Soft Magnetic Alloys." Materials Science Forum 659 (September 2010): 429–34. http://dx.doi.org/10.4028/www.scientific.net/msf.659.429.

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In this paper, we present an application of the so-called hyperbolic model of magnetization. The model was modified and it was applied for nine different soft magnetic alloys. The tested samples were electro-technical steels (FeSi alloys) and a permalloy (FeNi alloy) with strongly different magnetic properties. Among them, there are top, medium and definitely poor quality soft magnetic materials as well. Their minor hysteresis loops and normal magnetization curves were measured by alternating current measurement. The hyperbolic model of magnetization was applied for the experimental normal magnetization curves. It was proved that the applied model is excellent for describing mathematically the experimental magnetization curves.
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Dissertations / Theses on the topic "FEXI"

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Pisharody, Sandhya. "A shape analysis approach to prediction of bone stiffness using FEXI." Thesis, University of Hull, 2007. http://hydra.hull.ac.uk/resources/hull:2685.

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The preferred method of assessing the risk of an osteoporosis related fracture is currently a measure of bone mineral density (BMD) by dual energy X-ray absorptiometry (DXA). However, other factors contribute to the overall risk of fracture, including anatomical geometry and the spatial distribution of bone. Finite element analysis can be performed in both two and three dimensions, and predicts the deformation or induced stress when a load is applied to a structure (such as a bone) of defined material composition and shape. The simulation of a mechanical compression test provides a measure of whole bone stiffness (N mm−1). A simulation system was developed to study the sensitivity of BMD, 3D and 2D finite element analysis to variations in geometric parameters of a virtual proximal femur model. This study demonstrated that 3D FE and 2D FE (FEXI) were significantly more sensitive to the anatomical shape and composition of the proximal femur than conventional BMD. The simulation approach helped to analyse and understand how variations in geometric parameters affect the stiffness and hence strength of a bone susceptible to osteoporotic fracture. Originally, the FEXI technique modelled the femur as a thin plate model of an assumed constant depth for finite element analysis (FEA). A better prediction of tissue depth across the bone, based on its geometry, was required to provide a more accurate model for FEA. A shape template was developed for the proximal femur to provide this information for the 3D FE analysis. Geometric morphometric techniques were used to procure and analyse shape information from a set of CT scans of excised human femora. Generalized Procrustes Analysis and Thin Plate Splines were employed to analyse the data and generate a shape template for the proximal femur. 2D Offset and Depth maps generated from the training set data were then combined to model the three-dimensional shape of the bone. The template was used to predict the three-dimensional bone shape from a 2D image of the proximal femur procured through a DXA scan. The error in the predicted 3D shape was measured as the difference in predicted and actual depths at each pixel. The mean error in predicted depths was found to be 1.7mm compared to an average bone depth of 34mm. 3D FEXI analysis on the predicted 3D bone along with 2D FEXI for a stance loading condition and BMD measurement were performed based on 2D radiographic projections of the CT scans and compared to bone stiffness results obtained from finite element analysis of the original 3D CT scans. 3D FEXI provided a significantly higher correlation (R2 = 0.85) with conventional CT derived 3D finite element analysis than achieved with both BMD (R2 = 0.52) and 2D FEXI (R2 = 0.44).
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Lampinen, Björn. "Protocol optimization of the filter exchange imaging (FEXI) sequence and implications on group sizes : a test-retest study." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-196327.

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Diffusion weighted imaging (DWI) is a branch within the field of magnetic resonance imaging (MRI) that relies on the diffusion of water molecules for its contrast. Its clinical applications include the early diagnosis of ischemic stroke and mapping of the nerve tracts of the brain. The recent development of filter exchange imaging (FEXI) and the introduction of the apparent exchange rate (AXR) present a new DWI based technique that uses the exchange of water between compartments as contrast. FEXI could offer new clinical possibilities in diagnosis, differentiation and treatment follow-up of conditions involving edema or altered membrane permeability, such as tumors, cerebral edema, multiple sclerosis and stroke. Necessary steps in determining the potential of AXR as a new biomarker include running comparative studies between controls and different patient groups, looking for conditions showing large AXR-changes. However, before designing such studies, the experimental protocol of FEXI should be optimized to minimize the experimental variance. Such optimization would improve the data quality, shorten the scan time and keep the required study group sizes smaller.  Here, optimization was done using an active imaging approach and the Cramer-Rao lower bound (CRLB) of Fisher information theory. Three optimal protocols were obtained, each specialized at different tissue types, and the CRLB method was verified by bootstrapping. A test-retest study of 18 volunteers was conducted in order to investigate the reproducibility of the AXR as measured by one of the protocols, adapted for the scanner. Group sizes required were calculated based on both CRLB and the variability of the test-retest data, as well as choices in data analysis such as region of interest (ROI) size. The result of this study is new protocols offering a reduction in coefficient of variation (CV) of around 30%, as compared to previously presented protocols. Calculations of group sizes required showed that they can be used to decide whether any patient group, in a given brain region, has large alterations of AXR using as few as four individuals per group, on average, while still keeping the scan time below 15 minutes. The test-retest study showed a larger than expected variability however, and uncovered artifact like changes in AXR between measurements. Reproducibility of AXR values ranged from modest to acceptable, depending on the brain region. Group size estimations based on the collected data showed that it is still possible to detect AXR difference larger than 50% in most brain regions using fewer than ten individuals. Limitations of this study include an imprecise knowledge of model priors and a possibly suboptimal modeling of the bias caused by weak signals. Future studies on FEXI methodology could improve the method further by addressing these matters and possibly also the unknown source of variability. For minimal variability, comparative studies of AXR in patient groups could use a protocol among those presented here, while choosing large ROI sizes and calculating the AXR based on averaged signals.
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Molina-Sepulveda, Roberto. "Hybridization of FETI Methods." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066455/document.

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Dans le présent travail, des nouvelles méthodes de décomposition de domaine et des nouvelles implémentations pour des méthodes existantes sont développées. Une nouvelle méthode basée sur les méthodes antérieures de décomposition du domaine est formulée. Les méthodes classiques FETI plus FETI-2LM sont utilisées pour construire le nouveau Hybrid-FETI. L'idée de base est de développer un nouvel algorithme qui peut utiliser les deux méthodes en même temps en choisissant dans chaque interface l'état le plus adapté en fonction des caractéristiques du problème. En faisant cela, nous recherchons un code plus rapide et plus robuste qui peut fonctionner avec des configurations selon lesquelles les méthodes de base ne le géreront pas de manière optimale par lui-même. La performance est testée sur un problème de contact. La partie suivante implique le développement d'une nouvelle implémentation pour la méthode S-FETI, l'idée est de réduire l'utilisation de la mémoire de cette méthode, afin de pouvoir fonctionner dans des problèmes de taille plus important. Différentes variantes pour cette méthode sont également proposées, tout en cherchant la réduction des directions stockées chaque itération de la méthode itérative. Finalement, une extension de la méthode FETI-2LM à sa version en bloc comme dans S-FETI, est développée. Les résultats numériques pour les différents algorithmes sont présentés
In this work new domain decomposition methods and new implementations for existing methods are developed. A new method based on previous domain decomposition methods is formulated. The classic FETI plus FETI-2LM methods are used to build the new Hybrid-FETI. The basic idea is to develop a new algorithm that can use both methods at the same time by choosing in each interface the most suited condition depending on the characteristics of the problem. By doing this we search to have a faster and more robust code that can work with configurations that the base methods will not handle it optimally by himself. The performance is tested on a contact problem. The following part involves the development of a new implementation for the S-FETI method, the idea is to reduce the memory usage of this method, to make it able to work in larger problem. Different variation for this method are also proposed, all searching the reduction of directions stored each iteration of the iterative method. Finally, an extension of the FETI-2LM method to his block version as in S-FETI, is developed. Numerical results for the different algorithms are presented
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Liu, Fei. "Réactions de fluoration de dérivés azotés insaturés en milieu superacide." Poitiers, 2010. http://theses.edel.univ-poitiers.fr/theses/2010/Liu-Fei/2010-Liu-Fei-These.pdf.

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L'utilisation des milieux superacides modifiant la réactivité des substrats organiques permet d'effectuer de nouvelles réactions et d'accéder rapidement à des produits originaux difficilement accessibles par les méthodes classiques. Il est alors possible de réaliser de nombreuses transformations directes, notamment des réactions de fluoration originales. Ce travail est consacré à l'étude de la réactivité de dérivés azotés insaturés en milieu superacide HF/SbF5 et en particulier au développement de nouvelles méthodes de fluoration de ce type de composés. Basée sur la formation d'intermédiaires dicationiques superélectrophiles, une nouvelle réaction d'hydrofluoration a été développée. L'utilisation de l'activation superélectrophile en milieu superacide a également permis la synthèse originale de sulfonamides cycliques et/ou fluorés. Après identification d'intermédiaires réactionnels polycationiques par analyse RMN in situ, une nouvelle méthode de synthèse de dérivés azotés gem-chlorofluorés et gem-difluorés a finalement été élaborée
In superacid the reactivity of organic substrates is strongly modified and new reactions can be performed, which allows a rapid access to original products. In these conditions, multiple direct transformations occur and especially original fluorination reactions. This work was devoted to the study of the reactivity of unsaturated nitrogen derivatives in superacid (HF/SbF5) and to the development of new methods of fluorination of these compounds. Based on the formation of superelectrophilic dicationic intermediates, a new reaction of hydrofluorination has been developed. The use of superelectrophilic activation in superacid also allowed the original synthesis of benzofused sultams and/or fluorinated sulfonamides. After identification of reaction polycationic intermediates by NMR in situ analysis, a new synthetic route to gem-chlorofluoro nitrogen derivatives or gem-difluoro nitrogen derivatives has finally been set up
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Toulougoussou, Ange Barthélemy. "Méthodes de sous-domaines pour le système de Stokes." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066694.

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L'objectif de cette thèse est de développer une méthode de décomposition de domaine pour la résolution du système de Stokes discrétisé avec les éléments finis mixtes stables où la pression est continue comme Hood-Taylor et Mini. La nouvelle méthode résulte dela combinaison de FETI qui est appliquée à la vitesse et de BDD qui est appliquée à la pression sans découpler les inconnues. Elle hérite et découple les projecteurs grossiers associés à FETI et à BDD. La méthodologie débouche sur un système linéaire symétrique,semi-défini positif que nous avons résolu par la méthode du gradient conjugué projeté préconditionné. La méthode contient deux préconditionneurs grossiers creux et des préconditionneurs locaux exacts qui assurent son extensibilié, sa robustesse et son efficacité. L'introduction de projecteurs locaux construits à partir des modes de pression des sousdomaines étend la méthode aux éléments finis mixtes discontinues en pression et rend le problème grossier de BDD facultatif même en présence de la pression aux interfaces.Nous avons aisément appliqué la méthode à l'élasticité incompressible et quasi-incompressible et elle peut s'étendre de la même façon au cadre plus général des systèmes de point-selle issus des problèmes de minimisation sous contraintes grâce à sa nature algébrique
The purpose of this thesis is to develop a domain decomposition method suitable tosolve the Stokes system discretized with stable mixte finite elements where pressure is continuous such as Hood-Taylor and Mini. The new method arises from the combinaison of FETI applied to the velocity and BDD applied to the pressure without decoupling the unknowns. It inherits and decouples the coarse projectors included in FETI and BDD. The methodology leads to a symmetric, positive semi-definite linear system that we solveby projected preconditioned conjugate gradient. The method contains two sparse coarse preconditionners and exact local preconditionners that ensure its scalability, its robustness and its efficiency. We use local projectors constructed from the constant pressure modes of the subdomains that enable an extension to mixte finite elements with discontinuous pressure and that make the coarse problem of BDD optional even in the presence of pressure on the interfaces. We have easily applied the method to incompressibleand almost incompressible elasticity and it can be extended the same way to other saddle-point systems arising from minimization problems under constraints due to its algebraic property
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Adeyemi, Adesola Olusiji. "The dramaturgy of Femi Osofisan." Thesis, University of Leeds, 2009. http://etheses.whiterose.ac.uk/8935/.

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Sanghavi, Chaitanya. "FETI methods for acoustic problems with porous materials." Thesis, Le Mans, 2020. http://www.theses.fr/2020LEMA1021.

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E présent travail traite de la modélisation numérique de traitements acoustiques à grande échelle en utilisant des méthodes de décomposition de domaine (MDD). Les principaux objectifs de la thèse sont triples : Premièrement, un choix de méthode de décomposition de domaine (DDM) approprié pour résoudre des problèmes de Helmholtz homogènes et hétérogènes à grande échelle est fait. Deux variantes différentes des méthodes FETI, à savoir FETI-2LM et FETI-H, sont mises en œuvre et comparées. Un choix approprié de la méthode est fait. Ensuite, une nouvelle stratégie de résolution est appliquée au DDM choisi pour résoudre de nombreux traitements acoustiques. Cette stratégie vise à réduire les coûts de calcul associés aux étapes. Troisièmement, des stratégies alternatives sont examinées pour réduire les coûts associés aux coûts itératifs du DDM. Une nouvelle méthode FETI-2LM à deux niveaux est formulée pour réduire les coûts des évaluations successives des revêtements. Une autre stratégie de recyclage basée sur l'utilisation des valeurs propres les plus influentes est examinée pour la méthode FETI-2LM. Un choix approprié de ces méthodes est fait. La modélisation numérique des traitements acoustiques à l'aide de méthodes efficaces nécessite des coûts de calcul importantss dans la phase de conception. Ce travail fournit une contribution permettant de résoudre ce problème à l'aide de la DDM
Sound absorbing materials such as foams are widelyused in many industrial and domestic applications toabsorb undesirable sound. One needs to perform many calculations to get desirable properties of thetreatment using optimization strategies.The state-of-the-art computational models requireprohibitively high computational time. Theproblematic of this PhD is to reduce thecomputational time for such models to speed updesign calculations.This document is a synthesis of the work carried outin this direction. The problem is addressed usingDomain Decompostion methods (DDM). It consists ofsplitting the original problem into small parts referredto as subdomains. A partial solution is computed onthese subdomains to match the global continuity inthe domain of interest. Different DDM methods are benchmarked in termsof performance and scalability , specific for porousmaterials. Any DDM consists of two major costs, thefactorization of the subdomains and iterative part forthe global convergence. A novel factorizationstrategy is implemented and applied in 2D and 3Dto demonstrate savings in time compared toconventional approaches. In the second part, themethod is further improved to reduce the iterativecosts for a series of calculations.A final workflow is proposed to make thecomputationa cost of these models afforable withinindustrial timeframes
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Hamrit, Oussama. "Etude des pertes magnétiques dans les matériaux magnétiques destinés aux applications de transport en haute fréquence et sous champ bidirectionnel." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLN003/document.

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Les pertes fer dans une machine électrique sont d'importance capitale, une estimation approximative de ces pertes peu mener à des solutions non viable sur le plan thermique, c'est dans ce contexte qu'il est indispensable d'avoir les caractéristiques les plus précises des matériaux magnétiques utilisés, de plus avec l'engouement récent pour les machines électriques haute vitesse (donc haute fréquence), il est important de caractériser les matériaux à haute fréquence. Dans les travaux de cette thèse, un système de mesure haute fréquence (1 T - 10 kHz) en champ unidirectionnel a été mis en place et des modèles de pertes magnétiques hautes fréquences ont été étudiés et discutés. Les champs magnétiques circulant dans une machine électrique sont de type alternatifs dans une direction donnée ou des champs elliptiques et tournants. C'est dans ce contexte qu'une caractérisation et un modèle en champ tournant ont été proposés. Enfin, dans le cas où le stator d'une machine électrique est découpé d'un seul tenant, la direction de découpe par rapport àla direction de laminage change d'un pas dentaire à un autre, pour cela une étude sur l'anisotropie des matériaux FeSi non orientés a été menée
Iron losses in electrical machine applications are of paramount importance, an approximate estimation of these losses can easily lead to a thermally unsustainable solution, in this context, it is essential to get exactly the magnetic characteristics of the magnetic materials used, moreover, with the recent interest for high speed electrical machines (high frequency), It is important to characterize magnetic materials at high frequency. In this work, a high frequency characterizing system (1 T - 10 kHz) under unidirectional field has been proposed and magnetic losses models has been studied and discussed. Magnetic fields in electrical machines could be alternative in one direction, elliptical or circular. In this context, a characterization under rotating field and a magnetic loss model has been proposed. Finally, when stator steel sheets are cut all in one piece, the cutting direction with regard to the rolling direction will change from one tooth pitch to another, for that a study of the FeSi non oriented anisotropy has been performed
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Luk, Yu-shing. "A study of Yue Fei studies since late Qing Qing mo yi lai zhi Yue Fei yan jiu /." Click to view the E-thesis via HKUTO, 1995. http://sunzi.lib.hku.hk/hkuto/record/B31950838.

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Reeve, Michael Andrew Hall. "Demonstrating the world mind and society in the Shuo Lin chapters of the "Han Fei Zi" /." online access from Digital Dissertation Consortium access full-text, 2003. http://libweb.cityu.edu.hk/cgi-bin/er/db/ddcdiss.pl?3080034.

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Books on the topic "FEXI"

1

Zhifeng, Wu, ed. Fei gang tie shi chang yu fen xi: Feigangtie Shichang yu Fenxi. Beijing: Hua xue gong ye chu ban she, 2014.

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Allinson, Beverley. Fefi. New York: Scholastic, 1995.

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yu), Hai xing (ying, and Quintana Anton, eds. Fei fei wang. Tai bei shi: Tai wan dong fang, 2002.

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Fei shi fei. Taibei Shi: Lian jing chu ban shi ye gong si, 1989.

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Moliner, Empar. Feli, esthéticienne. Barcelona: Ediciones Destino, 2000.

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Benzoni, Ferruccio. Fedi nuziali. Milano: All'insegna del pesce d'oro, 1991.

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Shi shi fei fei. Beijing: Xian dai chu ban she, 2001.

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Fei ba! fei zhu. Taibei Shi: Huang guan wen xue chu ban you xian gong si, 1994.

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Yu xue fei fei. Shanghai: Shi ji chu ban ji tuan, 2014.

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Yu xue fei fei. Taibei Shi: Mai tian chu ban, 2013.

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Book chapters on the topic "FEXI"

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Wei, Chunyan, Fuzhen Cheng, and Junhan You. "FeII, FeI Emission Lines from Accretion Disks: An Explanation for “FeII Problem” in AGNs ?" In Multi-Wavelength Continuum Emission of AGN, 463. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-010-9537-2_169.

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Katuši, Bernarda. "Feri, Zoran." In Kindlers Literatur Lexikon (KLL), 1. Stuttgart: J.B. Metzler, 2020. http://dx.doi.org/10.1007/978-3-476-05728-0_11711-1.

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Roux, François-Xavier, and André Barka. "FETI Methods." In Computational Electromagnetics, 651–85. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-4382-7_19.

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Strauhs, Doreen. "Osofisan, Femi." In Kindlers Literatur Lexikon (KLL), 1. Stuttgart: J.B. Metzler, 2020. http://dx.doi.org/10.1007/978-3-476-05728-0_16668-1.

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Kaneko, T., and T. Kanomata. "5.4.30 FeSi." In Magnetic Properties of d-Elements, Alloys and Compounds Under Pressure, 459–60. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41834-1_256.

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Breitinger, Eckhard. "Osofisan, Femi: Morountodun." In Kindlers Literatur Lexikon (KLL), 1–2. Stuttgart: J.B. Metzler, 2020. http://dx.doi.org/10.1007/978-3-476-05728-0_16669-1.

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Baratta, G. B., and R. Viotti. "FeII Reference Catalogue." In Physics of Formation of FeII Lines Outside LTE, 9–10. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-4023-9_2.

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Kubin, Wolfgang. "Han Fei." In Kindlers Literatur Lexikon (KLL), 1. Stuttgart: J.B. Metzler, 2020. http://dx.doi.org/10.1007/978-3-476-05728-0_11523-1.

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Weiβ, Eberhard. "Das FERI Branchen Rating." In Kreditrisiken erfolgreich managen, 217–25. Wiesbaden: Gabler Verlag, 1999. http://dx.doi.org/10.1007/978-3-322-86916-6_9.

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Hansen-Kokoruš, Renate. "Feri, Zoran: Kalendar Maja." In Kindlers Literatur Lexikon (KLL), 1–2. Stuttgart: J.B. Metzler, 2020. http://dx.doi.org/10.1007/978-3-476-05728-0_11713-1.

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Conference papers on the topic "FEXI"

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Inhester, B., G. Stenborg, R. Schwenn, N. Srivastava, and B. Podlipnik. "LASCO FeXIV and FeX observations of the solar coronal rotation during the recent solar activity minimum." In The solar wind nine conference. AIP, 1999. http://dx.doi.org/10.1063/1.58763.

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Paraschos, G. N., and M. N. Vouvakis. "The Dual, Overlapping Primal FETI (FETI-DOP) domain decomposition." In 2011 IEEE Antennas and Propagation Society International Symposium and USNC/URSI National Radio Science Meeting. IEEE, 2011. http://dx.doi.org/10.1109/aps.2011.5997156.

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Guhathakurta, Madhulika, Richard R. Fisher, and Keith Strong. "Observations and physical interpretations of coronal rays from white light, soft X-ray, red (FeX) and green (FeXIV) lines analyses." In Proceedings of the eigth international solar wind conference: Solar wind eight. AIP, 1996. http://dx.doi.org/10.1063/1.51372.

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Xue, Ming-Feng, and Jian-Ming Jin. "A two-level nested FETI/FETI-DP domain decomposition method." In 2013 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium). IEEE, 2013. http://dx.doi.org/10.1109/usnc-ursi.2013.6715333.

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Lochner, Nash, and Marinos N. Vouvakis. "BEM-FEBI Formulation Through ‘PECfication’." In 2019 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium). IEEE, 2019. http://dx.doi.org/10.1109/usnc-ursi.2019.8861702.

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Xue, Ming-Feng, and Jian-Ming Jin. "A hybrid nonconformal FETI/conformal FETI-DP method for arbitrary nonoverlapping domain decomposition modeling." In 2013 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. IEEE, 2013. http://dx.doi.org/10.1109/aps.2013.6711473.

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Paraschos, Georgios N., and Marinos N. Vouvakis. "FETI-LEAP: Making domain decomposition robust." In 2012 IEEE Antennas and Propagation Society International Symposium and USNC/URSI National Radio Science Meeting. IEEE, 2012. http://dx.doi.org/10.1109/aps.2012.6348070.

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Niarchos, D., M. Gjoka, V. Psycharis, and E. Devlin. "Towards realization of bulk L10-FeNi." In 2017 IEEE International Magnetics Conference (INTERMAG). IEEE, 2017. http://dx.doi.org/10.1109/intmag.2017.8007560.

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Hassan, Marwan, and David S. Weaver. "The Effect of Flat Bar Supports on Streamwise Fluidelastic Instability in Heat Exchanger Tube Arrays." In ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-29038.

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Abstract:
Flow-induced vibration is an important criterion for the design of heat exchangers in nuclear, fossil and chemical plant. Of the several known vibration excitation mechanisms, fluidelastic instability (FEI) is the most serious because it can cause tube failures in a relatively short period of time. Traditionally, FEI has been observed to occur in the direction transverse to the flow and anti-vibration bars (AVB) have been used to stiffen the tubes against this motion. More recently, interest has increased in the possibility of FEI occurring in the streamwise direction, parallel to the flow. This is the subject of the present paper. Numerical simulations have been carried out to study the effects of tube-to-support clearance, tube sliding friction, tube-to-support preload, and ambient turbulence levels on the FEI threshold in the streamwise direction. As one would expect, increasing friction and tube preload against the support both tend to stabilize the tube against streamwise FEI. Importantly, the results also show that decreasing tube-support clearances destabilizes streamwise FEI while having little effect on transverse FEI. Increasing ambient turbulence levels also has the effect of destabilizing streamwise FEI.
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Tai, Ming-Fong, Jong-Kai Hsiao, Hon-Man Liu, Shio-Chao Lee, and Shin-Tai Chen. "Synthesis Fe-Ni Alloy Magnetic Nanoparticles for Biomedical Applications." In ASME 2006 Multifunctional Nanocomposites International Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/mn2006-17041.

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In this investigation, we synthesize FeNi alloy magnetic nanoparticles (MNPs) by using both chemical precipitation and combustion methods. The FeNi MNPs prepared by combustion method have a rather high saturation magnetization Ms of ∼180 emu/g and a coercivity field Hc of near zero. The functionalized FeNi MNPs which were coated with biocompatible polyethyleneimine (PEI) polymer have also been synthesized. We demonstrated that the PEI coated FeNi MNPs can enter the mammalian cells in vitro and can be used as a magnetic resonance imagine (MRI) contrast agent. The results demonstrated that FeNi MNPs potentially could be applied in the biomedical field. To prepare a higher quality and well controlled Fe-Ni MNPs, we also developed a thermal reflux chemical precipitation method to synthesize FeNi3 alloy MNPs. The precursor chemicals of Fe(acac)3 and Ni(acac)2 in a molecular ratio of 1:3 reacted in octyl ether solvent at the boiling point of solvent (∼300°C) by the thermal reflux process. The 1,2-hexadecandiol and tri-n-octylphosphine oxide (TOPO) were used as reducer and surfactant, respectively. The chemically precipitated FeNi3 MNPs are well dispensed and have well-controlled particle sizes around 10–20 nm with a very narrow size distribution (± 1.2 nm). The highly monodispersive FeNi3 NPs present good uniformity in particle shape and crystallinity on particle surfaces. The MNPs exhibit well soft magnetism with saturation magnetization of ∼61 emu/g and Hc ∼ 0. The functionalized magnetic beads with biocompatible polymer coated on MNPs are also generated completed for biomedical applications.
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Reports on the topic "FEXI"

1

Shul, Randy J., Michael J. Rye, Greg Salazar, and Steve Ball. FEI FIB/SEM Failure Analysis. Office of Scientific and Technical Information (OSTI), January 2019. http://dx.doi.org/10.2172/1492079.

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GRIFFITH, RICHARD O., and KENNETH K. MURATA. Proposed Extension of FETI Methods to the Boundary Element Technique. Office of Scientific and Technical Information (OSTI), October 2001. http://dx.doi.org/10.2172/787646.

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PIERSON, KENDALL H., GARTH M. REESE, MANOJ K. BHARDWAJ, TIMOTHY F. WALSH, and DAVID M. DAY. Experiences with FETI-DP in a Production Level Finite Element Application. Office of Scientific and Technical Information (OSTI), May 2002. http://dx.doi.org/10.2172/800966.

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Parish, Chad M. MT3FT-15OR0204122: Report on the acquisition and installation of FEI Talos F200X S/TEM. Office of Scientific and Technical Information (OSTI), September 2015. http://dx.doi.org/10.2172/1234344.

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Williams, Alan B. Finite Element Interface to Linear Solvers (FEI) version 2.9 : users guide and reference manual. Office of Scientific and Technical Information (OSTI), February 2005. http://dx.doi.org/10.2172/958392.

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O'Loughlin, Edward J., Michelle M. Scherer, and Kenneth M. Kemner. INVESTIGATION OF THE TRANSFORMATION OF URANIUM UNDER IRON-REDUCING CONDITIONS: REDUCTION OF UVI BY BIOGENIC FEII/FEIII HYDROXIDE (GREEN RUST). Office of Scientific and Technical Information (OSTI), December 2006. http://dx.doi.org/10.2172/896297.

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Gilchrist, Brian, Dave Morris, Tom Liu, Chris Deline, and Rafael Ramos. A Student Get-Away-Special Space Shuttle Experiment to Demonstrate Cold-Cathode Field Emitter Technology in Space (FEGI). NANOSAT FY03. Fort Belvoir, VA: Defense Technical Information Center, February 2006. http://dx.doi.org/10.21236/ada455647.

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Bhardwaj, M., D. Day, C. Farhat, M. Lesoinne, K. Pierson, and D. Rixen. Application of the FETI Method to ASCI Problems: Scalability Results on One Thousand Processors and Discussion of Highly Heterogeneous Problems. Office of Scientific and Technical Information (OSTI), April 1999. http://dx.doi.org/10.2172/6127.

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Chand, Duli, Rob Newsom, Tyler Thorsen, Erol Cromwell, Chitra Sivaraman, Connor Flynn, John Shilling, and Jennifer Comstock. Aerosol and Cloud Optical Properties from the ARM Raman Lidars: The Feature Detection and Extinction (FEX) Value-Added Product. Office of Scientific and Technical Information (OSTI), August 2019. http://dx.doi.org/10.2172/1560857.

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Porosity, permeability, and grain density core analysis results from the FEX Limited Partnership Aklaq #6 well and white light and ultra-violet photography of the FEX Limited Partnership Aklaq #2, Aklaq #6, and Aklaqyaak #1 wells. Alaska Division of Geological & Geophysical Surveys, January 2011. http://dx.doi.org/10.14509/22925.

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