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Dissertations / Theses on the topic 'Control coefficient'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

SCALA, GIUSEPPE ANTONIO. "Problemi di controllo ottimo per sistemi non lineari con struttura State-Dependent Coefficient, implicazioni ed aspetti computazionali." Doctoral thesis, Università Politecnica delle Marche, 2022. http://hdl.handle.net/11566/295585.

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La categoria di sistemi dinamici più assodata e studiata da maggior tempo è quella dei sistemi lineari; tuttavia, la maggior parte dei sistemi reali è non lineare, l’approccio State Dependent Coefficient (SDC) propone un metodo per rappresentarli con strutture simili a quelle del mondo lineare ma conservando la loro natura non lineare. I sistemi lineari tempo invarianti sono stati ampiamente studiati, è possibile identificare chiaramente le caratteristiche come aggiungibilità, osservabilità e stabilità. Le tecniche di controllo possono raggiungere l’ottimo globale in modo matematicamente cert

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2

Ortega, Villa Ana Maria. "Semiparametric Varying Coefficient Models for Matched Case-Crossover Studies." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/64181.

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Semiparametric modeling is a combination of the parametric and nonparametric models in which some functions follow a known form and some others follow an unknown form. In this dissertation we made contributions to semiparametric modeling for matched case-crossover data. In matched case-crossover studies, it is generally accepted that the covariates on which a case and associated controls are matched cannot exert a confounding effect on independent predictors included in the conditional logistic regression model. Any stratum effect is removed by the conditioning on the fixed number of sets of

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3

Drews, Aaron M. "Control of Thermal Expansion Coefficient of a Metal Powder Composite via Ceramic Nanofiber Reinforcement." University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1248114951.

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4

Seo, Dongjin. "Measurement and Control of Slip-Flow Boundary Conditions at Solid-Gas Interfaces." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/50650.

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This thesis describes measurements of the gas-solid flow boundary condition at moderate Knudsen number, i.e., where the dimensions of the flow are similar to the mean free path, and thus partial slip is expected. This regime has become more important with increased focus on nano-scale devices, but there is currently no consensus on how the slip length should vary for different solids and gases, or whether it can be controlled. In this thesis, I describe unambiguous measurements showing that partial slip occurs, that the slip length depends both on gas and solid, and that the slip length can be

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Farrand, Steven Wesley. "Rockfall Modelling Parameters and the Control Barrier at Stockton Mine, New Zealand." Thesis, University of Canterbury. Geological Sciences, 2007. http://hdl.handle.net/10092/3520.

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Solid Energy New Zealand plans to mine a 6 to 10m thick coal seam below the Mt. Augustus and Mt. Fredrick ridgeline at Stockton Mine near Westport, NZ. The coal is covered by up to 30m of overburden, which requires removal to access 4 million tones of high quality coal. However, the Coal Mining Lease boundary (CML) is located just below the basal coal measures and the neighbouring land is owned by the Department of Conservation (DoC). In addition, the neighbouring DoC estate is Powelliphanta Augustus snail habitat. It is necessary to remove the overburden without releasing any material above n

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6

Malladi, Vijaya Venkata Narasimha Sriram. "Development and Design of Self-Sensing SMAs using Thermoelectric Effect." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/33407.

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Active research of SMAs has shown that its Seebeck coefficient is sensitive to its martensitic phase transformation and has the potential to determine the SMAs state of transformation. The combination of Shape Memory Alloys, which have a positive Seebeck coefficient, and Constantan which has a negative Seebeck coefficient (-35 mV/K) results in a thermocouple capable of measuring temperature. The work presented in this thesis is based on the development and design of this sensor. This sensor is used to study the hysteretic behaviour of SMAs. Although Shape Memory Alloys (SMAs) exhibit a myri

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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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Hegen, Peter [Verfasser]. "Integrated Hardware & Software Platform with Automated FIR Filter Coefficient Adaptation for Advanced Control of Modern Hand Prostheses / Peter Hegen." München : Verlag Dr. Hut, 2019. http://d-nb.info/1196415153/34.

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9

Krise, Jeffrey Raymond. "Characterization of High Inlet Diffusion Low Flow Coefficient Inducer Pumps for Space Propulsion in the Presence of a Cavitation Control Device." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/6212.

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Historically inducer pumps have been designed with low inlet diffusion that allows for a gradual pressure rise through the machine that has the ability to slowly collapse any cavitation bubbles that may be present. A novel cavitation control device has been developed by researchers at ConceptsNREC that has been shown in previous experimental work to greatly improve the suction performance of a traditionally designed machine. Computational fluid dynamics (CFD) has been employed to understand the effectiveness of the cavitation control device (CCD) at controlling the conditions that lead to cavi

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10

Hermes, Eliane. "Efeito da carga hidráulica e qualidade de água na uniformidade de sistema de irrigação por gotejamento." Universidade Estadual do Oeste do Parana, 2010. http://tede.unioeste.br:8080/tede/handle/tede/335.

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Made available in DSpace on 2017-05-12T14:48:07Z (GMT). No. of bitstreams: 1 Eliane Hermes.pdf: 848736 bytes, checksum: 5c07576b6d2d54fb662b1b0b914ecc1b (MD5) Previous issue date: 2010-02-11<br>Universidade Federal do Paraná<br>One of the factors that should be considered when purchasing an irrigation system is related to its application uniformity. It has a direct influence on agricultural productivity, which tends to increase with the improvement of this uniformity. The fertigation through drip irrigation system provides better application uniformity, therefore contributing to water and en

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Diniz, Junior Walter Ferreira. "Controle de frequência para otimização da potência em um sistema de transmissão de energia sem fios." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/170927.

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Nesse trabalho é apresentada uma estratégia de controle para manter a potência entregue a carga do link indutivo de um sistema de transferência de potência sem fios maximizada continuamente. Inicialmente, foi desenvolvido o modelo do link indutivo do sistema, de forma a encontrar uma expressão para a potência na carga. Em seguida, essa expressão foi analisada, buscando os pontos de potência máxima correspondentes às frequências ressonantes quando o fator de acoplamento magnético do link indutivo era variado. Assim, foi estabelecido um método para estimar esse fator de acoplamento k e consequen

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12

Huang, Heng. "Facility layout using layout modules." Columbus, OH : Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1059074390.

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Thesis (Ph. D.)--Ohio State University, 2003.<br>Title from first page of PDF file. Document formatted into pages; contains xii, 156 p. : ill., (some col.). Includes abstract and vita. Advisor: Shahrukh A. Irani, Dept. of Industrial and Systems Engineering. Includes bibliographical references (p. 147-156).

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Mwaniki, Fredrick Mukundi. "High voltage boost DC-Dc converter suitable for variable voltage sources and high power photovoltaic application." Diss., University of Pretoria, 2013. http://hdl.handle.net/2263/37320.

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Important considerations of a photovoltaic (PV) source are achieving a high voltage and drawing currents with very little ripple component from it. Furthermore, the output from such a source is variable depending on irradiation and temperature. In this research, literature review of prior methods employed to boost the output voltage of a PV source is examined and their limitations identified. This research then proposes a multi-phase tapped-coupled inductor boost DC-DC converter that can achieve high voltage boost ratios, without adversely compromising performance, to be used as an interface t

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14

Kjellin, Jon. "Vertical Axis Wind Turbines : Electrical System and Experimental Results." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-182438.

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The wind power research at the division of Electricity at Uppsala University is aimed towards increased understanding of vertical axis wind turbines. The considered type of wind turbine is an H-rotor with a directly driven synchronous generator operating at variable speed. The experimental work presented in this thesis comprises investigation of three vertical axis wind turbines of different design and size. The electrical, control and measurement systems for the first 12 kW wind turbine have been designed and implemented. The second was a 10 kW wind turbine adapted to a telecom application. B

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15

Chester, Ryan T. "Error Sensor Strategies for Active Noise Control and Active Acoustic Equalization in a Free Field." Diss., CLICK HERE for online access, 2008. http://contentdm.lib.byu.edu/ETD/image/etd2298.pdf.

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Hernández, Ricardo Hernández. "Controle estatístico de processo aplicado na uniformidade da irrigação e fertirrigação por gotejamento." Universidade Estadual do Oeste do Parana, 2010. http://tede.unioeste.br:8080/tede/handle/tede/329.

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Made available in DSpace on 2017-05-12T14:48:05Z (GMT). No. of bitstreams: 1 Ricardo Hernandez Hernandez.pdf: 3158706 bytes, checksum: 62d0c80e1a396806112462820f82a55a (MD5) Previous issue date: 2010-07-01<br>Water use, both to supply the population, as for food production, in increasing numbers, forces countries like Brazil to adopt strict regulations regarding the use of water, which soon will be in effect throughout the Brazilian territory. The drip irrigation systems have increased employment in the face of the above. This thesis aimed to adapt the methodology of statistical process cont

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17

Blomberg, Joel. "Sensitivity study of control rod depletion coefficients." Thesis, Uppsala universitet, Tillämpad kärnfysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-256092.

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This report investigates the sensitivity of the control rod depletion coefficients, Sg, to different input parameters and how this affects the accumulated 10B depletion, β. Currently the coefficients are generated with PHOENIX4, but the geometries can be more accurately simulated in McScram. McScram is used to calculate Control Rod Worth, which in turn is used to calculate Nuclear End Of Life, and Sg cannot be generated in the current version of McScram. Therefore, it is also analyzed whether the coefficients can be related to CRW and thus be studied indirectly through it. Simulations of the c

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18

Sasson, Jonathan. "Small Scale Mass Flow Plug Calibration." Case Western Reserve University School of Graduate Studies / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=case1417540797.

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19

El-Bordany, Refaat. "In orbit calibration of satellite inertia matrix and thruster coefficients." Thesis, University of Surrey, 2001. http://epubs.surrey.ac.uk/842840/.

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In this research study, several new in-orbit algorithms are proposed to improve the performance of Attitude Determination and Control System (ADCS) by estimating the inertia matrix and calibrating the cold gas thruster system of the UoSAT-12 spacecraft. Computer-based simulation models will be constructed using MATLAB and SIMULINK in order to evaluate the expected performance. The first focus is on the identification of the satellite inertia matrix. A new algorithm based on a Recursive Least Square (RLS) estimation technique is proposed for in-orbit use to estimate the inertia matrix (moments

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20

Kropáčová, Lucie. "Návrh na snížení zákaznických reklamací." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2016. http://www.nusl.cz/ntk/nusl-234826.

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The master’s thesis is focused on evaluation of present process of managment of complaints in particular company in 2014. The evaluation is made by quality managment tools and with using correlation analysis. On the basis of acquired pieces of information there will be suggest corrective measures. These correctives measures will lead to improvement of managment process of complaints and reduce customer complaints.

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21

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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Rao, Zhiping. "L'approche Hamilton-Jacobi-Bellman pour des problèmes de contrôle optimal avec des coefficients discontinus." Phd thesis, Ecole Polytechnique X, 2013. http://pastel.archives-ouvertes.fr/pastel-00927358.

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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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23

Hamade, Firas Nadim. "Sediment removal from urban runoff using seep berms and vegetative filtration." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50271.

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Previous field demonstration projects in metro-Atlanta have shown that seep berms, which are elongated sedimentation basins at the outlet of a disturbed land area, can provide high suspended sediment trap efficiencies with respect to coarse sediments on construction sites having drainage areas greater than five acres. Previous literature has shown that vegetative filter strips are efficient traps for fine suspended sediment in stormwater runoff. A combination of a seep berm and vegetative filter in series was studied in this thesis as an erosion control measure with quantification of its flow

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24

Karlsson, Henrik. "Uplift Modeling : Identifying Optimal Treatment Group Allocation and Whom to Contact to Maximize Return on Investment." Thesis, Linköpings universitet, Statistik och maskininlärning, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-157962.

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This report investigates the possibilities to model the causal effect of treatment within the insurance domain to increase return on investment of sales through telemarketing. In order to capture the causal effect, two or more subgroups are required where one group receives control treatment. Two different uplift models model the causal effect of treatment, Class Transformation Method, and Modeling Uplift Directly with Random Forests. Both methods are evaluated by the Qini curve and the Qini coefficient. To model the causal effect of treatment, the comparison with a control group is a necessit

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25

Zhang, Yandong Sinha S. C. "Some techniques in the control of dynamic systems with periodically varying coefficients." Auburn, Ala., 2007. http://hdl.handle.net/10415/1346.

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26

ADDONA, DAVIDE. "Parabolic operators with unbounded coefficients with applications to stochastic optimal control games." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2015. http://hdl.handle.net/10281/76535.

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The aim of this thesis is to improve some results on parabolic Cauchy problems with unbounded coefficients and their connection with stochastic optimal games. In the first part we summarize the recent results on parabolic operators with unbounded coefficients and on stochastic optimal control problem. In particular, in the matter of analyitic results, we recall the main exstence and uniqueness theorems for parabolic Cauchy problems with unbounded coefficients, the gradient estimates for the associated evolution operator, and its continuity and compactness properties. About the stochastic part

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27

Таранюк, Каріна Вікторівна, Карина Викторовна Таранюк та Karina Viktorivna Taraniuk. "Організаційно-економічні основи управління екологічним ризиком на регіональному рівні". Thesis, Вид-во СумДУ, 2014. http://essuir.sumdu.edu.ua/handle/123456789/36765.

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У дисертації досліджені методичні підходи до формування системи управління екологічними ризиками на регіональному рівні. Розроблені методичні рекомендації дозволяють оцінити її ефективність на основі показників зрілості та керованості. Запропоновано методику експрес-оцінки рівня керованості для основних груп екологічних ризиків у регіоні, яка дозволить суттєво зменшити трудомісткість розрахунків. Удосконалено організаційно-економічний механізм управління екологічними ризиками на регіональному рівні за рахунок впровадження спеціалізованих функціональних структур ризик-менеджменту та проектного

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Längkvist, Martin. "Online Identification of Friction Coefficients in an Industrial Robot." Thesis, Linköping University, Department of Electrical Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-19269.

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<p>All mechanical systems with moving parts are affected by friction, including industrial robots. Being able to design an accurate friction model would further increase the performance of todays robots. Friction is a complex dynamic phenomena that is constantly changing depending on the state and environment of the robot. It is therefore beneficial to update the parameters of the friction model online. An estimate of the friction will be made using the feedback control signal with the help of a feedforward control scheme in a two axis simulation setup. The friction estimate is then used for a

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29

Luu, Hoang Duc, Joseph Páez Chávez, Doan Thai Son, and Stefan Siegmund. "Finite-time Lyapunov exponents and metabolic control coefficients for threshold detection of stimulus–response curves." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-215920.

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In biochemical networks transient dynamics plays a fundamental role, since the activation of signalling pathways is determined by thresholds encountered during the transition from an initial state (e.g. an initial concentration of a certain protein) to a steady-state. These thresholds can be defined in terms of the inflection points of the stimulus-response curves associated to the activation processes in the biochemical network. In the present work, we present a rigorous discussion as to the suitability of finite-time Lyapunov exponents and metabolic control coefficients for the detection of

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Amdouni, Asma. "Surveillance statistique du coefficient de variation dans un contexte de petites séries." Nantes, 2015. http://archive.bu.univ-nantes.fr/pollux/show.action?id=dcf36868-32b2-41d6-916b-f9533ee12902.

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La maîtrise statistique des procédés (MSP) est une méthode de contrôle de la qualité basée sur les statistiques. La surveillance du coefficient de variation est une approche efficace à la MSP lorsque la moyenne du processus µ et son écart type σ ne sont pas constants mais leur rapport est constant. Jusqu’à présent, les études portant sur la surveillance du coefficient de variation se sont limitées au cas d’une production avec un horizon infini. Cette thèse présente de nouvelles cartes de contrôle pour surveiller le coefficient de variation dans le contexte fini lorsque les paramètres sont conn

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31

Cassiani-Ingoni, Lionel. "Etude d'un hydrogel, copolymere (mma-co-vp) utilise comme precurseur de lentilles de contact : caracterisation du gel, diffusion et activite du lysozyme dans la matrice." Paris 6, 1987. http://www.theses.fr/1987PA066299.

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32

Bouloc, François. "Étude expérimentale du coefficient de transfert thermique dans une ligne d'échappement présentant une singularité." Nantes, 2007. http://www.theses.fr/2007NANT2078.

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Le présent travail porte sur l'étude expérimentale des transferts thermiques au sein d'une ligne d'échappement présentant une singularité de type coude à angle droit. On étudie l'influence de la fréquence d’intermittence de l’écoulement des gaz d'échappement et du débit masse moyen sur la valeur du coefficient de transfert gaz-paroi. L'application principale de cette étude est la conception de nouvelles lignes d'échappement permettant de réduire l'émission de polluants. Un dispositif expérimental à été conçu dans le but de réaliser des expériences dans des conditions bien maîtrisées, et permet

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Mahmoud, Nawrous Ibrahim. "A Backstepping Design of a Control System for a Magnetic Levitation System." Thesis, Linköping University, Department of Electrical Engineering, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1960.

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<p>The subject of this thesis is the design of a control law for a magnetic levitation system, which in this case is the system 33-210. The method used is backstepping technique and specifically adaptive observer backstepping due to parameter uncertainties and lack of access to all the states of the system. The second state of the system, the speed of the steel ball, was estimated by a reduced order observer. The model used gave us the opportunity to estimate a parameter which in the literature is denoted virtual control coefficient. Backstepping method gives us a rather straight forward way t

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Sprowl, Tony Brandon. "A study of the effects of inlet preswirl on the dynamic coefficients of a straight-bore honeycomb gas damper seal." Texas A&M University, 2003. http://hdl.handle.net/1969.1/1617.

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In high-pressure centrifugal compressors, honeycomb seals are often used as replacements for labyrinth seals to enhance dynamic stability. A concern exists with the loss of this enhanced stability if the honeycomb cavities become clogged with debris over time. So, as a first objective, static and dynamic tests were conducted on a constant-clearance honeycomb and a constant-clearance smooth-bore seal under three inlet preswirl conditions to determine the effects of inlet preswirl. The resulting leakage flowrate and dynamic parameters, effective stiffness and damping of the seal, were measured f

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Мисак, Ігор Васильович. "Гідравлічне моделювання мереж дощового водовідведення за наявності регулювання стоку". Diss., Національний університет "Львівська політехніка", 2021. https://ena.lpnu.ua/handle/ntb/56782.

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Jebelli, Ali. "Development of Sensors and Microcontrollers for Underwater Robots." Thesis, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31283.

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Nowadays, small autonomous underwater robots are strongly preferred for remote exploration of unknown and unstructured environments. Such robots allow the exploration and monitoring of underwater environments where a long term underwater presence is required to cover a large area. Furthermore, reducing the robot size, embedding electrical board inside and reducing cost are some of the challenges designers of autonomous underwater robots are facing. As a key device for reliable operation-decision process of autonomous underwater robots, a relatively fast and cost effective controller based on F

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Fahim, Faragallah Sheded Sameh. "Procédé de production de lipopeptide par Bacillus subtilis." Thesis, Lille 1, 2011. http://www.theses.fr/2011LIL10120/document.

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L'influence des facteurs principe environnement dans le but d'optimiser la production des bioprocédés lipopeptide ont été testés en vue de son utilisation dans la conception nouvelle de bioréacteur à lit fluidisé inverse couplée à une section film de liquide dessus. La production de surfactine lipopeptides et fengycine a été réalisée par les cellules libres et immobilisées aérobie d'un nouveau dérivé spontanée Bacillus subtilis BBG21, qui est un mutant spontané de l'ATCC 21332 considérés comme de type sauvage. Les résultats ont été comparés à ceux obtenus avec la souche de type sauvage. Les pr

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Frigo, Jiam Pires. "Controle do processo da irrigação no sistema de aspersão convencional em Palotina-PR." Universidade Estadual do Oeste do Parana, 2012. http://tede.unioeste.br:8080/tede/handle/tede/395.

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Made available in DSpace on 2017-05-12T14:48:31Z (GMT). No. of bitstreams: 1 Jiam.pdf: 2209564 bytes, checksum: fc1f56484d81335ed0d86787f88cc96f (MD5) Previous issue date: 2012-02-20<br>Sprinkler irrigation, an artificial method of water application, supplies the whole or part of water that crops need. It can be used in several crops. Besides, it is easily adapted to different soils and topographies. Irrigation should be carried out according to the right bulk and uniformity, since it is an important factor to be considered when irrigation systems are under evaluation. Most losses are associ

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Saulich, Sven. "Generic design and investigation of solar cooling systems." Thesis, Loughborough University, 2013. https://dspace.lboro.ac.uk/2134/13627.

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This thesis presents work on a holistic approach for improving the overall design of solar cooling systems driven by solar thermal collectors. Newly developed methods for thermodynamic optimization of hydraulics and control were used to redesign an existing pilot plant. Measurements taken from the newly developed system show an 81% increase of the Solar Cooling Efficiency (SCEth) factor compared to the original pilot system. In addition to the improvements in system design, new efficiency factors for benchmarking solar cooling systems are presented. The Solar Supply Efficiency (SSEth) factor p

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Bouchoucha, Ali. "Étude du comportement en frottement et usure des contacts électriques glissants cuivre-acier et cuivre-graphite." Vandoeuvre-les-Nancy, INPL, 1997. http://www.theses.fr/1997INPL006N.

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Les phénomènes de transfert métallique et d'oxydation sont favorisés par la charge normale, la vitesse de glissement et/ou l'intensité de courant électrique et sa direction. Dans le cas du contact cuivre-acier, le courant électrique engendre un comportement sévère en frottement et sur usure favorisant la génération d'oxydes durs à l'interface. En revanche, dans un contact cuivre-graphite, il conduit à un faible coefficient de frottement. D’autre part, il est montré que l'environnement gazeux joue un rôle majeur dans le comportement des deux couples. S’agissant du couple cuivre-acier, le milieu

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Frigo, Jiam Pires. "CONTROLE ESTATÍSTICO DA QUALIDADE NA IRRIGAÇÃO POR ASPERSÃO." Universidade Estadual do Oeste do Parana, 2014. http://tede.unioeste.br:8080/tede/handle/tede/208.

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Made available in DSpace on 2017-05-12T14:47:09Z (GMT). No. of bitstreams: 1 Jiam Pires_ Frigo.pdf: 2243207 bytes, checksum: 76a818d3ba4a98ecda459c13486050ca (MD5) Previous issue date: 2014-06-02<br>The sprinkler irrigation system is widely used because of the possibility of high uniform distribution and to adapt itself to different crops and soils. On the other hand, the water uniform application in irrigation is affected by meteorological factors that decrease the system efficiency. There has always been some concern about the quality of products and services in human history, since all pr

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Dainez, Paulo Sérgio. "Contribuições para o acionamento do compressor linear ressonante sem sensor de posição." Universidade do Estado de Santa Catarina, 2010. http://tede.udesc.br/handle/handle/1903.

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Made available in DSpace on 2016-12-12T17:38:37Z (GMT). No. of bitstreams: 1 Paulo Sergio Dainez - resumo.pdf: 31972 bytes, checksum: 94a24928564b90b196513e814cfe09a3 (MD5) Previous issue date: 2010-06-25<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>In the resonant linear compressor the piston is drive by a linear actuator and a resonant mechanical spring directly in the reciprocating motion, this is a mass spring resonant system, eliminating bearing and crank of the conventional reciprocating compressors, and the friction loss has a significant reduction. The maximum di

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Straka, Martin. "Výpočtové modelování vysokofrekvenčního hluku v kabině letounu EV-55M." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230560.

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This thesis describes methods of high frequency noise and vibrations computation of cabin part of EV–55M (aircraft developed by Evektor Kunovice). There is a brief summary of methods used for determining high frequency noise and vibrations in the first part of the thesis. Detailed explanation is given for Statistical Energy Analysis (SEA) which is nowadays the most dominant method in this area. The energy balance equation is derived in this chapter and SEA parameters such as modal density, damping loss factor, coupling loss factor and power input are introduced here. Next part deals with main

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Mehta, Vikas Chandra. "PERFORMANCE OF PAN-TILT TRACKER BASED ON THE PIN-HOLE LENS MODEL." UKnowledge, 2009. http://uknowledge.uky.edu/gradschool_theses/596.

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In the modern day, recognition and tracking of face or the iris is potentially one of the most powerful ways of differentiating between an authentic person and an imposter. Our method uses stereo vision to track the 3-Dimensional coordinates of a target equivalent to a person’s eyes and using a pan-tilt unit we target these areas for additional processing such as iris or facial imaging. One of the most important parts involved in tracking is the way the pan-tilt unit is calibrated. There have been techniques in the past where PTZ (Pan-tilt-zoom) digital camera has been used and calibrated usin

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Huang, Shaojuan. "Equations Différentielles Stochastiques Rétrogrades ; Contrôle Optimal Stochastique ; Gestions de Portefeuille." Paris 6, 2001. http://www.theses.fr/2001PA066120.

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Reisdörfer, Marcelo. "Utilização da AHP e controle estatístico do processo na avaliação de módulos de irrigação por gotejamento." Universidade Estadual do Oeste do Parana, 2013. http://tede.unioeste.br:8080/tede/handle/tede/182.

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Made available in DSpace on 2017-05-12T14:46:58Z (GMT). No. of bitstreams: 1 Marcelo Reisdorfer.pdf: 6217647 bytes, checksum: defcf69e9ade22f915fc6d407b4577d0 (MD5) Previous issue date: 2013-11-07<br>This paper shows the studied results of uniformity evaluation in 23 irrigation modules tracked by gravity in familiar farms in Salto do Lontra city / PR from 2009 to 2013. Uniformity coefficients (UC, UD, UE and ) and CEP plus the decision support AHP method were applied in this trial in order to evaluate the whole drip irrigation project. The results obtained by the uniformity coefficients indi

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Giraldo, soto Catalina. "Optimisation des techniques de surveillance et développement de l'analyse de données pour la caractérisation in-situ du comportement énergétique réel de l'enveloppe du bâtiment." Thesis, Bordeaux, 2021. http://www.theses.fr/2021BORD0041.

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L’objectif général de ce projet est de progresser dans la fiabilité et l’optimisation des systèmes de surveillance et de contrôle pour l’estimation et le découplage des HLC, afin de pouvoir définir un Kit de Surveillance énergétique minimum pour les bâtiments résidentiels ou tertiaires. Ces kits de suivi doivent être aussi discrets que possible et doivent permettre de suivre de manière fiable un minimum de données qui, associées à une analyse correcte, doivent permettre de caractériser le comportement réel de l’enveloppe du bâtiment.Après la présentation des méthodes existantes pour l’estimati

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Galand, Quentin. "Experimental investigation of the diffusive properties of ternary liquid systems." Doctoral thesis, Universite Libre de Bruxelles, 2012. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209626.

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A fundamental step in the further developments of comprehensive modelling of the diffusive processes in liquids requires the possibility of obtaining reliable and accurate experimental data of the diffusion and thermodiffusion coefficients of multicomponent liquid systems. In the present work, we perform an experimental investigation of the diffusive properties of binary and ternary liquid systems. Two experimental techniques, the ‘Open Ended Capillary’ technique and the ‘Transient Interferometric Technique’ have been developed. Those techniques have been used for the experimental characteriza

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Campillo, Fabien. "Quelques applications des processus de diffusion: filtrage/statistique - contrôle - homogénéisation." Habilitation à diriger des recherches, Université Rennes 1, 2004. http://tel.archives-ouvertes.fr/tel-00485401.

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Ce document se décompose en trois axes: – Le premier s'attache à différents problèmes de filtrage et de statistique pour des processus de diffusion partiellement observés. – Le deuxième traite d'un problème de contrôle stochastique de type ergodique. il s'agit de calculer des lois de commande pour des amortisseurs semi–actifs (contrat avec Renault). – Le dernier traite de quelques problèmes d'homogénéisation pour des processus aléatoires en milieux hétérogène. Il s'agissait à l'origine d'un contrat avec l'IFP pour le développement de méthodes de Monte Carlo pour le calcul de coefficients effec

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Gélébart, Yann. "Évaluation non destructive par ultrasons du vieillissement thermique d'une structure composite." Le Havre, 2007. http://www.theses.fr/2007LEHA0002.

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Ce travail est consacré au suivi du vieillissement thermique d’un matériau composite par des méthodes ultrasonores. Quatre séries d’échantillons, correspondant à des vieillissements différents, ont été utilisées. Trois méthodes d’évaluation non destructive par ultrasons sont ensuite présentées : la mesure du coefficient de transmission d’une onde plane à travers le matériau composite, la mesure de l’impédance électromécanique d’un transducteur du commerce couplé au matériau à caractériser, une méthode par propagation d’onde de Lamb. Pour chacune de ces méthodes, une modélisation permettant de

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