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Dissertations / Theses on the topic 'Approach coefficients'

Author: Grafiati
Published: 3 June 2025
Last updated: 31 July 2025

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1

Tang, Lin. "Efficient Inference for Periodic Autoregressive Coefficients with Polynomial Spline Smoothing Approach." University of Toledo / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1449770216.

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2

Rao, Zhiping. "Hamilton-Jacobi-Bellman approach for optimal control problems with discontinuous coefficients." Palaiseau, Ecole polytechnique, 2013. https://pastel.hal.science/docs/00/92/73/58/PDF/Thesis.pdf.

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Cette thèse porte sur l'approche de Programmation dynamique et Hamilton-Jacobi- Bellman pour une classe générale de problèmes déterministes de contrôle optimal avec des coefficients discontinus. Les outils utilisés dans ce travail se basent essentiellement sur la théorie de contrôle, la théorie de viscosité pour les équations aux dérivées partielles, l'analyse nonlisse et les systèmes dynamiques. La première partie de la thèse concerne le problème des trajectoires discontinues sous contraintes sur l'état, où les trajectoires sont solutions de systèmes dynamiques impulsionnels. Un résultat de c
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3

Manjo, Persis Yefon. "A fundamental approach to predicting mass transfer coefficients in bubble column reactors." Master's thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/9120.

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Includes bibliographical references.<br>A bubble column reactor is a vertical cylindrical vessel used for gas-liquid reactions. Bubble Columns have several applications in industry due to certain obvious advantages such as high gas-liquid interfacial area, high heat and mass transfer rates, low maintenance requirements and operating costs. On the other hand, attempts at modelling and simulation are complicated by lack of understanding of hydrodynamics and mass transfer characteristics. This complicates design scale-up and industrial usage. Many studies and models have attempted to evolve under
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4

Wu, Baohua. "Data Driven Approaches to Testing Homogeneity of Intraclass Correlation Coefficients." Digital Archive @ GSU, 2010. http://digitalarchive.gsu.edu/math_theses/92.

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The test of homogeneity for intraclass correlation coefficients has been one of the active topics in statistical research. Several chi-square tests have been proposed to test the homogeneity of intraclass correlations in the past few decades. The big concern for them is that these methods are seriously biased when sample sizes are not large. In this thesis, data driven approaches are proposed to testing the homogeneity of intraclass correlation coefficients of several populations. Through simulation study, data driven methods have been proved to be less biased and accurate than some commonly u
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5

Woolley, Brandon H. "An Approach to Concept Development for Compliant Mechanisms Possessing High Coefficients of Restitution." Diss., CLICK HERE for online access, 2003. http://contentdm.lib.byu.edu/ETD/image/etd183.pdf.

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6

Sipitca, Mihai. "A conditional entropy approach to encoding DCT coefficients for low bit rate video compression." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/13404.

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7

ANDRADE, MARCIA SANTOS. "A NEW APPROACH FOR ESTIMATING THE COEFFICIENTS OF SCALABILITY ASSOCIATED WITH NON PARAMETRIC ITEM RESPONSE THEORY." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2012. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=22829@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>PROGRAMA DE EXCELENCIA ACADEMICA<br>A finalidade desta tese é propor estimadores pontuais para os coeficientes de escalonabilidade associados à Teoria de Resposta ao Item não Paramétrica (TRIN), a saber: Hij, Hi e H, e seus respectivos estimadores da variância, baseados na abordagem da amostragem de populações finitas. Com o objetivo de investigar empiricamente a qualidade destes estimadores são consideradas as po
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8

Hutacharoen, Panatpong. "Prediction of partition coefficients and solubilities of active pharmaceutical ingredients with the SAFT-γ Mie group-contribution approach". Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/56214.

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Partition coefficient and solubility are very useful properties in a variety of product and process design problems. Especially in the octanol-water system, partition coefficients (Ki_OW) are used as indicators for a drug's lipophilicity which is a key physicochemical property in drug design. Solid phase solubility is a fundamental parameter in the design of crystallisation processes commonly used in the pharmaceutical and agrochemical industries. The ability to predict these properties from the molecular structure of compounds is therefore highly desirable. In this thesis, the recently develo
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9

Vigneaux, Juan Pablo. "Topology of statistical systems : a cohomological approach to information theory." Thesis, Sorbonne Paris Cité, 2019. http://www.theses.fr/2019USPCC070.

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Cette thèse étend dans plusieurs directions l’étude cohomologique de la théorie de l’information initiée par Baudot et Bennequin. On introduit une notion d'espace statistique basée sur les topos, puis on étudie plusieurs invariants cohomologiques. Les fonctions d’information et quelques objets associés apparaissent comme des classes de cohomologie distinguées ; les équations de cocycle correspondantes codent les propriétés récursives de ces fonctions. L'information a donc une signification topologique et la topologie sert de cadre unificateur.La première partie traite des fondements géométriqu
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10

Rambaks, Andris, Filipp Kratschun, Carsten Flake, Maren Messirek, Katharina Schmitz, and Hubertus Murrenhoff. "Computational approach to the experimental determination of diffusion coefficients for oxygen and nitrogen in hydraulic fluids using the pressure-decay method." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71099.

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In the presented paper, the applicability of pressure-decay methods to determine the diffusivities of gases in hydraulic fluids is analysed. First, the method is described in detail and compared to other measurement methods. Secondly, the thermodynamics and the mass transfer process of the system are studied. This results in four different thermodynamic models of the gaseous phase in combination with two diffusion models. Thirdly, the influence of the models on the pressure-decay method is evaluated computationally by examining the diffusion process of air in water as all system parameters are
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11

Fahd, Faisal. "Risk Assessment Approach for Evaluating Recycled Materials Use in Road Construction: A Pilot Study." University of Toledo / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1230027556.

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12

Liu, Huayu. "Modified Profile Likelihood Approach for Certain Intraclass Correlation Coefficient." Digital Archive @ GSU, 2011. http://digitalarchive.gsu.edu/math_theses/96.

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In this paper we consider the problem of constructing confidence intervals and lower bounds forthe intraclass correlation coefficient in an interrater reliability study where the raters are randomly selected from a population of raters.The likelihood function of the interrater reliability is derived and simplified, and the profile likelihood based approach is readily available for computing the confidence intervals of the interrater reliability. Unfortunately, the confidence intervals computed by using the profile likelihood function are in general too narrow to have the desired coverage proba
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13

Forouzanfar, Mohamad. "A Modeling Approach for Coefficient-Free Oscillometric Blood Pressure Estimation." Thesis, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31213.

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Oscillometry is the most common measurement method used in automatic blood pressure (BP) monitors. However, most of the oscillometric algorithms are without physiological and theoretical foundation, and rely on empirically derived coefficients for systolic and diastolic pressure evaluation which affects the reliability of the technique. In this thesis, the oscillometric BP estimation problem is addressed using a comprehensive modeling approach, based on which coefficient-free estimation of BP becomes possible. A feature-based neural network approach is developed to find an implicit relationshi
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14

CHEN, ZHAOREN. "ANALYSIS OF EQUITY MARKETS: A SPEARMAN RANK CORRELATION COEFFICIENT APPROACH." Thesis, The University of Arizona, 2016. http://hdl.handle.net/10150/612636.

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In this honors thesis, I attempted to develop an investment strategy to analyze the U.S. stock market by studying the correlations between nine sectors defined by the Select Sector Standard & Poor’s Depository Receipts (SPDR). These funds are a group of exchange-traded funds (ETFs) which are traded worldwide and can adequately represent the performance of the sectors. Through my method, I hope to identify the sector trends in the future by evaluating the sector ETF’s most recent short-term period data. This analysis will provide an alternate investment method for investors to avoid short-term
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15

González, Rafael Yari Cabanillas. "Attenuation Coefficient of High Temperature Molten Salts: An Experimental Approach." Thesis, The University of Arizona, 2014. http://hdl.handle.net/10150/323440.

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In order to make thermal solar power compete with the traditional sources of energy, the efficiency must increase and one way of doing it is by changing the operating fluid. Among the alternate fluids is the use of molten salts as a part of the process; either for thermal storage and later utilization for electrical production during the hours without sun or as a substitute of the operating fluid to provide higher temperatures resulting in better efficiency. The difficulty of using molten salts is the lack of physical properties in literature; such as viscosity, boiling point, vapor pressure a
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16

Singh, P. "A spin coefficient approach to vacuum quadratic Poincaré gauge field theory." Thesis, Loughborough University, 1990. https://dspace.lboro.ac.uk/2134/13760.

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The field equations of the vacuum Quadratic Poincare Gauge Field Theory are expressed in the spin coefficient formalism of Newman and Penrose. These equations are differential identities involving the curvature and torsion, and in this NewmanPenrose type approach must be combined with the generalized Newman-Penrose identities given in chapter 4. The use of this Newman-Penrose type formalism is demonstrated in the derivation of several new classes of exact solutions which would have been impossible to obtain by the various methods being used at this moment in time. This therefore demonstrates t
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17

Rassart, Étienne 1975. "Geometric approaches to computing Kostka numbers and Littlewood-Richardson coefficients." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/16632.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 2004.<br>Includes bibliographical references (p. 119-125).<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Using tools from combinatorics, convex geometry and symplectic geometry, we study the behavior of the Kostka numbers and Littlewood-Richardson coefficients (the type A weight multiplicities and Clebsch-Gordan coefficients). We sh w that both are given by piecewise polynomial functions in the entries of the pa
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18

Lin, Hui-Fen. "A Comparison of Three Item Selection Methods in Criterion-Referenced Tests." Thesis, University of North Texas, 1988. https://digital.library.unt.edu/ark:/67531/metadc332327/.

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This study compared three methods of selecting the best discriminating test items and the resultant test reliability of mastery/nonmastery classifications. These three methods were (a) the agreement approach, (b) the phi coefficient approach, and (c) the random selection approach. Test responses from 1,836 students on a 50-item physical science test were used, from which 90 distinct data sets were generated for analysis. These 90 data sets contained 10 replications of the combination of three different sample sizes (75, 150, and 300) and three different numbers of test items (15, 25, and 35).
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19

Rassi, Erik Michael. "An inverse approach to coefficient of thermal expansion optimization in optical structures." Thesis, Montana State University, 2007. http://etd.lib.montana.edu/etd/2007/rassi/RassiE1207.pdf.

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20

HAN, XIAOZHEN. "Evaluating the Correlation Coefficient of Bivariate Failure Times: A Copula-based Approach." Case Western Reserve University School of Graduate Studies / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=case1427993855.

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21

SHANG, FENG. "PATH-DEPENDENT APPROACH TO ESTIMATE CHLORINE WALL DEMAND COEFFICIENT IN WATER DISTRIBUTION SYSTEM." University of Cincinnati / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1109274766.

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22

Olynyk, Thierry. "Coefficients de transport de particules browniennes en solution : approche expérimentale et modélisation." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2001. http://tel.archives-ouvertes.fr/tel-00146787.

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Les coefficients d'autodiffusion, le coefficient de diffusion mutuelle ainsi que la conductivité sont des propriétés de transport des ions en solution pouvant être déterminées expérimentalement, par des calculs analytiques ou par simulation de dynamique brownienne.<br />Nous avons comparé ces méthodes pour trois électrolytes en solution aqueuse : le tungtosilicate de sodium avec ou sans sulfate de sodium ajouté, les chlorures de cryptate de potassium et de baryum ; le chlorure de potassium.<br />La voltammétrie à signaux carrés de potentiel a permis de mesurer le coefficient d'autodiffusion de
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23

Rossignol, Antoine. "Proposition pour une nouvelle approche des relations différentielles linéaires à coefficients constants." Toulouse 3, 1997. http://www.theses.fr/1997TOU30117.

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Les equations differentielles lineaires a coefficients constants sont tres utilisees en physique. On les rencontre souvent sous la forme de relations differentielles de la forme q(y) = p(z). Si par exemple p(x) = 3x#2 - x + 1, p(z) = 3z" - z' + z. Pour obtenir y, appele signal de sortie, en fonction de z, signal d'entree, on utilise le plus souvent la transformation de laplace ou la theorie des distributions. Ces deux theories presentent des incovenients : manque de rigueur parfois dans la presentation pour la transformation de laplace, trop grand niveau d'abstraction pour les distributions. L
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24

Jardat, Marie. "Approche par dynamique brownienne des coefficients de transport de solutions d'electrolytes inorganiques." Paris 6, 1999. http://www.theses.fr/1999PA066256.

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L'objet de cette these a ete de developper une dynamique des solutions de particules chargees, dans le modele de solvant continu, en tenant compte des caracteristiques hydrodynamiques du solvant. Un code de simulation numerique satisfaisant a ces criteres a ete ecrit. Il a d'abord ete teste sur des solutions d'electrolytes simples, pour lesquelles la litterature fournit de nombreuses valeurs experimentales ainsi que des resultats provenant de theories du transport. Ensuite, cet outil methodologique a ete applique a des systemes plus complexes, representant de bonnes approximations du modele de
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25

Olynyk, Thierry. "Coefficients de transport de particules browniennes en solution : approche experimentale et modelisation." Paris 6, 2001. https://tel.archives-ouvertes.fr/tel-00146787.

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Les coefficients d'autodiffusion, le coefficient de diffusion mutuelle ainsi que la conductivite sont des proprietes de transport des ions en solution pouvant etre determinees experimentalement, par des calculs analytiques ou par simulation de dynamique brownienne. Nous avons compare ces methodes pour trois electrolytes en solution aqueuse : le tungstosilicate de sodium avec ou sans sulfate de sodium ajoute ; les chlorures de cryptate de potassium et de baryum ; le chlorure de potassium. La voltammetrie a signaux carres de potentiel a permis de mesurer le coefficient d'autodiffusion de l'ion t
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26

Neekhra, Siddharth. "A new mineralogical approach to predict coefficient of thermal expansion of aggregate and concrete." Texas A&M University, 2004. http://hdl.handle.net/1969.1/1461.

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A new mineralogical approach is introduced to predict aggregate and concrete coefficient of thermal expansion (CoTE). Basically, a modeling approach is suggested based on the assumption that the CoTE of aggregate and concrete can be predicted from the CoTE of their constituent components. Volume percentage, CoTE and elastic modulus of each constituent mineral phase are considered as input for the aggregate CoTE model, whereas the same properties for coarse aggregate and mortar are considered for the concrete CoTE model. Methods have been formulated to calculate the mineral volume percentage fr
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27

Hager, Corinne. "Données familiales multivariées : une approche par le coefficient de corrélation vectorielle /." [S.l.] : [s.n.], 1999. http://library.epfl.ch/theses/?nr=2067.

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28

Ricard, Fabienne. "La structure par terme des taux d'intérêt : approche analytique et économétrique." Paris 2, 2005. http://www.theses.fr/2005PA020051.

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Ce travail traite de la structure par terme des taux d'intérêt. Après avoir défini les différentes notions employées dans cette étude, une analyse empirique sur la période comprise entre le 1er Janvier 1998 et Octobre 2002 est effectuée. Elle est complétée par une analyse économique. Elles soulignent les liens entre les taux des diverses échéances. Les modèles basés sur les processus stochastiques sont ensuite exposés. Les tests économétriques entrepris à l'aide des discrétisations d'Euler et Milstein montrent les limites modèles à un ou deux facteurs. Le recours à d'autres méthodes, objet de
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29

Zeeshan, Syed. "Verification of Bridge Foundation Fixity for Three Different Types of Soil." OpenSIUC, 2016. https://opensiuc.lib.siu.edu/theses/1859.

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The purpose of this study is to investigate the footing fixity effect on the lateral deflection of a bridge pier for different types of soil. Generally, the rotational restraint coefficient at top and bottom of pier (degree of fixity of the pier) is used to compute the effective length factor of pier which is in turn used to determine the pier deflection. The magnitude of the deflection is used to determine whether the p-delta force effect should be considered while designing the pier. However, the pier deflection is usually computed by assuming that the pier footing is completely fixed to the
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30

Mokeddem, Abdelhammid. "Modélisation géomécanique et probabiliste des rideaux de palplanches : prise en compte de l’interaction sol-structure et de la variabilité spatiale du sol." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0057/document.

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Le comportement géomécanique des ouvrages géotechniques à l’exemple des rideaux de palplanches est entaché d’incertitudes épistémiques liées aux hypothèses régissant le modèle géomécanique de calcul, mais aussi d’incertitudes aléatoires liées à la variabilité spatiale du sol. L’objectif principal de cette thèse est de mieux appréhender l’effet de ces incertitudes sur le comportement d’un rideau de palplanches. Pour cela le présent mémoire s’articule autour de quatre points principaux : Le premier point est relatif d’une part à l’analyse des hypothèses utilisées pour la modélisation géomécaniqu
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Wolfe, Patrick Jason. "Perceptually motivated approaches to audio signal enhancement : broadband noise reduction via Bayesian modelling of time-frequency coefficients." Thesis, University of Cambridge, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.619708.

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32

Bano, Nafisa. "Neural Network Approach for Predicting the Failure of Turbine Components." Thesis, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24343.

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Turbine components operate under severe loading conditions and at high and varying temperatures that result in thermal stresses in the presence of temperature gradients created by hot gases and cooling air. Moreover, static and cyclic loads as well as the motion of rotating components create mechanical stresses. The combined effect of complex thermo-mechanical stresses promote nucleation and propagation of cracks that give rise to fatigue and creep failure of the turbine components. Therefore, the relationship between thermo-mechanical stresses, chemical composition, heat treatment, resulting
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33

Gil, Camilo. "An Optimal Control Approach for Determiniation of the Heat Loss Coefficient in an ICS Solar Domestic Water Heating System." Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2567.

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Water heating in a typical home in the U.S. accounts for a significant portion (between 14% and 25%) of the total home's annual energy consumption. The objective of considerably reducing the home's energy consumption from the utilities calls for the use of onsite renewable energy systems. Integral Collector Storage (ICS) solar domestic water heating systems are an alternative to help meet the hot water energy demands in a household. In order to evaluate the potential benefits and contributions from the ICS system, it is important that the parameter values included in the model used to estimate
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Pestova, Valentina. "Coefficients de fiabilité et approche hierarchique pour la detection et le dénombrement de petits objets dans une vidéo." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0462/document.

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Le problème du dénombrement d’un grand nombre de très petits objets en mouvement dans les vidéos est un contexte applicatif jusqu’à présent peu étudié.Dans ce cadre, la difficulté réside essentiellement dans le fait qu’en raison de leurs très petites tailles apparentes dans la vidéo, il n’est pas possible de définir un modèle géométrique fiable de ces objets. Or, les travaux existants dans le domaine de la détection d’objets dans des vidéo, utilisent souvent un tel modèle géométrique des objets d’intérêt. Les méthodes de détection existantes ne sont de ce fait pas applicables directement dans
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Fonley, Morgan Rae. "Effects of oscillatory forcing on hydrologic systems under extreme conditions: a mathematical modeling approach." Diss., University of Iowa, 2015. https://ir.uiowa.edu/etd/2075.

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At the large watershed scale, we emphasize the effects of flow through a river network on streamflow under dry conditions. An immediate consequence of assuming dry conditions is that evapotranspiration causes flow in the river network to exhibit oscillations. When all links in the river network combine their flow patterns, the oscillations interact in ways that change the timing and amplitude of the streamflow waves at the watershed outlet. The geometric shape of the river network is particularly important, so we develop a
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Yu, Haixuan. "An integrated systems approach to understanding distortion and residual stress during thermal processing: design for heat treating." Digital WPI, 2019. https://digitalcommons.wpi.edu/etd-dissertations/565.

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Heat treatment processes are used to develop the desired mechanical properties for steels. Unfortunately, heat treatment, especially quenching, can cause distortion. Failure to meet geometry specifications can result in extensive rework or rejection of the parts. A series of quenching simulations, using DANTE, have been conducted on an AISI 4140 steel Navy C-ring distortion coupon and a WPI designed plate with a hole to determine the effects of quenching process parameters including part geometry, agitation during quenching, and quench start temperatures on distortion. The heat transfer coeffi
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Davarzani, Hossein. "Déterminations théorique et expérimentale des coefficients de diffusion et de thermodiffusion en milieu poreux." Thesis, Toulouse, INPT, 2010. http://www.theses.fr/2010INPT0003/document.

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Les conséquences liées à la présence de gradients thermiques sur le transfert de matière en milieu poreux sont encore aujourd’hui mal appréhendées, essentiellement en raison de la complexité induite par la présence de phénomènes couplés (thermodiffusion ou effet Soret). Le but de cette thèse est d’étudier et de comprendre l’influence que peut avoir un gradient thermique sur l’écoulement d’un mélange. L’objectif principal est de déterminer les coefficients effectifs modélisant les transferts de chaleur et de matière en milieux poreux, et en particulier le coefficient de thermodiffusion effectif
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Leskovec, Martin. "Method Development for Heat Transfer Predictions in Channel Flows : An efficient CFD approach for ribbed stationary channels." Thesis, Linköpings universitet, Mekanisk värmeteori och strömningslära, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-132166.

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Gas turbines are today used in numerous industrial and aeronautical applications. To increase the specific power output and efficiency, a high turbine inlet gas temperature is desired. The high temperature leads to the need of cooling critical components in the hot gas path. Siemens Industrial Turbomachinery AB, SIT AB, in Finspång manufactures gas turbines where the internal cooling of critical components is done through serpentine channels. To utilize the cooling air as efficiently as possible, vortex creating objects are placed inside the channel which result in higher heat transfer. To com
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Ben, Abdallah Khaled. "Le transport routier énergiquement durable : état des lieux, modélisation et aide à la décision publique en Tunisie." Thesis, Littoral, 2015. http://www.theses.fr/2015DUNK0371/document.

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Dans le contexte actuel d'urgence environnementale, la consommation de carburant dans le secteur du transport routier, vu son impact négatif sur l'environnement et son rôle socioéconomique, doit évoluer dans une logique de durabilité. Nous initions notre travail de thèse par une approche comparative de 90 pays quant à leur intensité énergétique et leur intensité de CO2 dans le transport routier durant la période 1980-2010. En calculant le coefficient de Theil, nos résultats empiriques mettent en évidence l'existence d'une disparité spatiale et temporelle. En 2010, la Tunisie occupe le 48ème ra
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Lee, Hyunwook. "A Polynomial Chaos Approach for Stochastic Modeling of Dynamic Wheel-Rail Friction." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/77195.

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Accurate estimation of the coefficient of friction (CoF) is essential to accurately modeling railroad dynamics, reducing maintenance costs, and increasing safety factors in rail operations. The assumption of a constant CoF is popularly used in simulation studies for ease of implementation, however many evidences demonstrated that CoF depends on various dynamic parameters and instantaneous conditions. In the real world, accurately estimating the CoF is difficult due to effects of various uncertain parameters, such as wheel and rail materials, rail roughness, contact patch, and so on. In this st
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Lutter, Franz Stephan, Stefan Giljum, and Martin Bruckner. "A review and comparative assessment of existing approaches to calculate material footprints." Elsevier, 2016. http://dx.doi.org/10.1016/j.ecolecon.2016.03.012.

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Effective implementation of resource policies requires consistent and robust indicators. An increasing number of national and international strategies focussing on resource efficiency as a means for reaching a green economy call for such indicators. As supply chains of goods and services are increasingly organised on the global level, comprehensive indica-tors taking into account upstream material flows associated with internationally traded products need to be compiled. Particularly in the last few years, the development of con-sumption-based indicators of material use also termed material f
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Laporte, Julie. "Etude et modélisation de l'endurance électrique de micro-contacts soumis à des sollicitations de fretting-usure : caractérisation de nouveaux dépôts base Argent." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEC034/document.

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L’instrumentation de plus en plus poussée des systèmes mécaniques (aéronautique, automobile,…) impose une utilisation croissante des connecteurs électriques. Cependant, leur environnement de fonctionnement (sollicitations chimiques et vibratoires) peut entrainer une dégradation plus ou moins sévère des contacts électriques limitant ainsi le passage du courant. Pour limiter cette dégradation et assurer la stabilité des connexions, des revêtements d’or sont couramment appliqués au niveau des contacts. Cependant, la conjecture économique et le coût très élevé de l’or nécessite de trouver une alte
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43

Gillet, Guillaume. "Prédiction de la conformité des matériaux d'emballage par intégration de méthodes de déformulation et de modélisation du coefficient de partage." Thesis, Vandoeuvre-les-Nancy, INPL, 2008. http://www.theses.fr/2008INPL081N/document.

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Les matériaux plastiques contiennent des additifs, qui ne sont pas fixés dans la matrice polymère et risquent migrer dans les aliments. La directive européenne 2002/72 a introduit la possibilité de démontrer l’aptitude au contact alimentaire de ces matériaux à partir d’approches prédictives, dont l’application est limitée par la disponibilité de données de formulation et de physico-chimie. Ces travaux visent à adapter et développer des approches analytiques rapides pour identifier et quantifier les substances majoritaires contenues dans les plastiques et à développer une approche générique de
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Vega, Guillaume. "Optimisation de la mise en forme par tréfilage : approche expérimentale, modélisation et simulation numérique." Thesis, Lille 1, 2009. http://www.theses.fr/2009LIL10173/document.

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Le but du travail de cette thèse est d'optimiser le procédé de mise en forme par tréfilage en utilisant une approche expérimentale, une modélisation analytique et une simulation numérique par éléments finis. Cette étude consiste à analyser les mécanismes de déformation et d'endommagement, mis en jeu par ce processus, qui constitue un problème multi physique complexe. Cette complexité se traduit par l'influence de nombreux paramètres intrinsèques et extrinsèques sur les propriétés de tréfilabilité des matériaux. Une analyse paramétrique du procédé de tréfilage a montré que différents paramètres
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Zhou, Jian. "Novel Approaches to Cell Isolation in Simple Inertial Microfluidic Devices." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1337716948.

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Thorne, Terrill D. "Does the Relative Price of Non-Traded Goods Contribute to the Short-Term Volatility in the U.S./Canada Real Exchange Rate? A Stochastic Coefficient Estimation Approach." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/31159.

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This study uses a random coefficient estimation procedure to test the hypothesis that much of the volatility in the U.S./Canada real exchange rate over the time period 1971 through 1999 is due to the relative price of non-traded goods to traded goods. The model specification used in this study provides estimates of the sensitivity of movements in the U.S./Canada real exchange rate to movements in both the relative price of traded goods and the relative price of non-traded goods to traded goods in each of the two countries. I test for purchasing power parity in each of the two components of th
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Elwinger, Fredrik. "Characterizing Chromatography Media : NMR-based Approaches." Doctoral thesis, KTH, Tillämpad fysikalisk kemi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-204572.

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Liquid chromatography is an essential technique in manufacturing biopharmaceuticals where it is used on all scales from analytical applications in R&amp;D to full-scale production. In chromatography the target molecule, typically a protein, is separated and purified from other components and contaminants. Separation is based on different affinities of different molecules for the chromatographic medium and the physical and chemical properties of the latter determine the outcome. Controlling and designing those properties demand efficient analytical techniques. In this thesis the approach was to
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Garafolo, Nicholas Gordon. "A Compressible Advection Approach in Permeation of Elastomer Space Seals." University of Akron / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=akron1271086523.

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Medina, Oscar F. "Analysis of Pre-ictal and Non-Ictal EEG Activity: An EMOTIV and LabVIEW Approach." Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc955040/.

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In the past few years, the study of electrical activity in the brain and its interactions with the body has become popular among researchers. One of the hottest topics related to brain activity is the epileptic seizure prediction. Currently, there are several techniques on how to predict a seizure; however, most of the techniques found in research papers are just mathematical models and not system implementations. The seizure prediction approach proposed in this thesis paper is achieved using the EMOTIV Epoc+ headset, MATLAB, and LabVIEW as the analog and digital signal processing devices. In
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Johner, Albert. "Approche microscopique et macroscopique de la reflectivite d'interfaces." Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13114.

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