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Dissertations / Theses on the topic 'Singular and Hyphenated Techniques'

Author: Grafiati

Published: 7 June 2025

Last updated: 2 August 2025

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1

Jordan, Sheri Lynne. "Hyphenated fourier transform infrared spectrometry : techniques for separations and analysis /." Diss., This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-08282003-155254/.

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2

Kapoore, Rahul Vijay. "Mass spectrometry based hyphenated techniques for microalgal and mammalian metabolomics." Thesis, University of Sheffield, 2014. http://etheses.whiterose.ac.uk/8234/.

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In metabolomics, the analytical challenge is to capture the chemical diversity of the metabolome. With the current technologies only a portion of the metabolome can be analysed. As a result there is a drive to direct significant analytical efforts towards capturing the metabolome or changes in the metabolome reliably and reproducibly in biological systems. Apart from analytical challenges, the challenges also include development of appropriate methodologies to quench and extract metabolites which is a crucial parameter in sample preparation and is required to achieve an accurate representation

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3

Fraser-Andrews, G. "Numerical techniques for singular optimal trajectories." Thesis, University of Hertfordshire, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372080.

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The objectives of the subject-matter of this thesis were to appraise some methods of solving non-singular optimal control problems by their degree of success in tackling four chosen problems and then to try the most promising methods on chosen singular problems. In Part I of this thesis, the chosen problems are attempted by quasilinearisation, two versions of shooting, Miels's method, differential dynamic programming and two versions of parameterisation . Conclusions on the various methods are given. NOC shooting, developed by the Numerical Optimisation Centre of The Hatfield Polytechnic, and

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4

Kardamis, Joseph R. "Audio watermarking techniques using singular value decomposition /." Online version of thesis, 2007. http://hdl.handle.net/1850/4493.

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5

Bailey, Nigel John Collingwood. "Development and application of hyphenated NMR techniques to the study of agrochemical metabolism." Thesis, Imperial College London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394243.

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6

Wangkarn, Sunanta. "Development of hyphenated analytical techniques for arsenic speciation in environmental and biological matrices." Thesis, Birkbeck (University of London), 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342227.

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7

Williams, Samuel Thomas. "Analysis of erythropoietin for anti-doping purposes with a focus on hyphenated techniques." Thesis, King's College London (University of London), 2014. https://kclpure.kcl.ac.uk/portal/en/theses/analysis-of-erythropoietin-for-antidoping-purposes-with-a-focus-on-hyphenated-techniques(8b6d26e7-a9c5-4d5a-9e3a-f32be79939e2).html.

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To improve detection of the misuse of erythropoietin (EPO) for performance enhancing purposes, this PhD examined ways to improve recovery and preanalysis concentration of EPO from urine. It also looked at ways to enhance the signal in liquid chromatography tandem mass spectrometry of the acidic glycopeptides from digested EPO, and at distinguishing between recombinant EPO and human urinary EPO based on differences in their glycosylation. Due to a shortage of supply of available analytical standards, model glycoproteins were frequently used in place of endogenous EPO. Immunoextraction with magn

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8

Prazen, Bryan J. "Development of high speed hyphenated chromatographic analyzers and second order data analysis techniques /." Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/11550.

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9

Eyres, Graham Terence, and n/a. "Determination of character-impact odorants in hop essential oils using hyphenated techniques in gas chromatography." University of Otago. Department of Food Science, 2007. http://adt.otago.ac.nz./public/adt-NZDU20080125.143442.

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Hops (Humulus lupulus L.) are an indispensable component of beer, with the essential oil responsible for imparting distinctive odour and aroma characteristics to beer. However, not all character-impact odorants in hop essential oil have been identified and hop aroma in beer is still not completely understood. The composition of hop essential oil is very complex with 485 compounds currently identified in the literature, and recent research suggests that up to 1000 compounds may actually be present. Only a certain number will be present at concentrations above threshold and make a direct contrib

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10

Vetere, Alessandro [Verfasser], and Wolfgang [Akademischer Betreuer] Schrader. "Development of hyphenated techniques for the analysis of complex mixtures / Alessandro Vetere ; Betreuer: Wolfgang Schrader." Duisburg, 2017. http://d-nb.info/1138922633/34.

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11

Tollbäck, Petter. "Large Volume Injection and Hyphenated Techniques for Gas Chromatographic Determination of PBDEs and Carbazoles in Air." Doctoral thesis, Stockholm University, Department of Analytical Chemistry, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-367.

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<p>This thesis is based on studies in which the suitability of various gas chromatography (GC) injection techniques was examined for the determination of polybrominated diphenyl ethers (PBDEs) and carbazoles, two groups of compounds that are thermally labile and/or have high boiling-points. For such substances, it is essential to introduce the samples into the GC system in an appropriate way to avoid degradation and other potential problems. In addition, different types of gas chromatographic column system and mass spectrometric detectors were evaluated for the determination of PBDEs.</p><p>Co

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12

Tollbäck, Petter. "Large volume injection and hyphenated techniques for gas chromatographic determination of PBDEs and carbazoles in air /." Stockholm : Department of Analytical Chemistry, Stockholm University, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-367.

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13

Scarfe, Graeme Bryan. "The in vivo metabolism of substituted anilines and acetanilides in rat using hyphenated NMR spectroscopic techniques." Thesis, Birkbeck (University of London), 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325321.

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14

LUPI, FRANCESCA. "Fungal populations and metabolism of fusarium mycotoxins in cereals: from occurrence to analysis by hyphenated analytical techniques." Doctoral thesis, Università di Foggia, 2017. http://hdl.handle.net/11369/361931.

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Il successo nella produzione di cereali, per quanto riguarda la contaminazione fungina durante la fase pre-raccolta, è fortemente correlato alla valutazione del controllo qualità. Lo scopo di questa ricerca è stato quello di studiare come lo zearalenone (ZEN), un metabolita secondario prodotto da diverse specie di Fusarium, sia metabolizzato e modificato nei cereali, come ad esempio il grano e l’orzo. Inoltre, abbiamo sviluppato e ottimizzato metodi analitici per l’identificazione di composti organici volatili (VOC) prodotti dall’interazione tra due specie fungine tossigene selezionate (F

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15

Fedrizzi, Bruno. "Identification, quantitation and origin of sulfur compounds in grape products. An approach via hyphenated mass spectrometry techniques." Doctoral thesis, Università degli studi di Padova, 2010. http://hdl.handle.net/11577/3426543.

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The contribute of the Analytical Chemistry in the study of complex matrices, as for instance foodstuff, is crucial. In particular the development of chromatographic methods allows to quantify important technological, microbiological and physiological markers. The ensemble of all these information furthers a deeper and higher knowledge. This Ph.D. project was designed to define the tools and evaluate the contribution of an important class of molecule on wine aroma. Grape products are really important in the cultural and dietary Italian traditions; moreover Italy is both the first producer a

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16

Harvey, Emily Paige. "Analysing mathematical models of intracellular calcium dynamics using geometric singular perturbation techniques." Thesis, University of Auckland, 2011. http://hdl.handle.net/2292/10814.

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Oscillations in free intracellular calcium (Ca2+) concentration are known to act as signals in almost all cell types, transmitting messages which control cellular processes including muscle contraction, cellular secretion and neuronal firing. Due to the universal nature of calcium oscillations, understanding the physiological mechanisms that underlie them is of great importance. A key feature of intracellular calcium dynamics that has been found experimentally is that some physiological processes occur much faster than others. This leads to models with variables evolving on very different time

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17

De, Goede Elana. "The development of analytical techniques for studying degradation in impact polypropylene copolymers." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/1162.

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Thesis (DSc (Chemistry and Polymer Science))--University of Stellenbosch, 2009.<br>Unstabilised polyolefins are susceptible to degradation when exposed to molecular oxygen, heat, irradiation as well as chemical and mechanical stimuli. Oxidation leads to changes in molecular properties such as molecular weight, molecular weight distribution, chemical composition, chemical composition distribution and crystallisability. Conventional analytical techniques are of limited use when studying the degradation of heterogeneous materials such as impact polypropylene copolymers (ICPP). These copolymers co

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18

Aravinthan, Abhiramy. "Linear quadratic regulator design for doubly fed induction generator using singular perturbation techniques." Thesis, Wichita State University, 2012. http://hdl.handle.net/10057/5523.

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Doubly fed induction generators (DFIG) are widely used in wind power generation because of their ability to be operated at varying rotational speeds while producing power output at a constant frequency. Electrical dynamics of a DFIG is modeled using field oriented control and represented as fourth order system. This fourth order dynamics exposes a two-time scale behavior. Using singular perturbation techniques the time scales can be separated as slow and fast subsystems. Feedback control schemes can be designed and the closed-loop stability of each model can be compared. In this work, a linear

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19

Crotty, Sarah Charlotte [Verfasser], Ulrich Sigmar [Gutachter] Schubert, and Georg [Gutachter] Pohnert. "Characterization of macromolecular systems by mass spectrometry and hyphenated techniques / Sarah Charlotte Crotty ; Gutachter: Ulrich Sigmar Schubert, Georg Pohnert." Jena : Friedrich-Schiller-Universität Jena, 2017. http://d-nb.info/1177601435/34.

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20

Lu, Weiying. "Development of Radial Basis Function Cascade Correlation Networks and Applications of Chemometric Techniques for Hyphenated Chromatography-Mass Spectrometry Analysis." Ohio University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1317231072.

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21

Bushong, Philip Merton. "A multi-loop guidance scheme using singular perturbation and linear quadratic regulator techniques simultaneously." Diss., This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-07282008-135643/.

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22

Morillo, Martín Diego. "Superparamagnetic iron oxide nanoparticles as arsenic adsorbent. Development of Nanofiber SPION Supports and Arsenic Speciation Using Synchrotron and Hyphenated Techniques." Doctoral thesis, Universitat Autònoma de Barcelona, 2013. http://hdl.handle.net/10803/129335.

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Los estudios que se han realizado en la presente tesis doctoral se basan en el desarrollo de una metodología de síntesis y caracterización de sistemas nanoestructurados como recurso innovador para la recuperación de arsénico en efluentes contaminados y la depuración de dichos efluentes. Estos materiales tienen como elemento común, el uso de las Superparamagnetic Iron Oxide Nanoparticles (SPION), con las que se han realizado diferentes estudios de adsorción para evaluar los parámetros de adsorción óptimos (tiempo de contacto, efecto del pH y de la concentración). Dichos estudios han permi

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23

Arroyo-Mora, Luis E. "The Use of Hyphenated Spectrometric Techniques for the Environmental Forensic Assessment of Non-Traditional Pollutants and Degradates in the Greater Florida Everglades." FIU Digital Commons, 2009. http://digitalcommons.fiu.edu/etd/144.

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A comprehensive investigation of sensitive ecosystems in South Florida with the main goal of determining the identity, spatial distribution, and sources of both organic biocides and trace elements in different environmental compartments is reported. This study presents the development and validation of a fractionation and isolation method of twelve polar acidic herbicides commonly applied in the vicinity of the study areas, including e.g. 2,4-D, MCPA, dichlorprop, mecroprop, picloram in surface water. Solid phase extraction (SPE) was used to isolate the analytes from abiotic matrices containin

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24

LA, MAIDA NUNZIA. "Development and validation of analytical methods with hyphenated chromatographic techniques for the determination of NPS and drugs of abuse in biological matrices." Doctoral thesis, Università Politecnica delle Marche, 2022. https://hdl.handle.net/11566/299808.

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Sin dal 1990 l'apparizione sul mercato di nuove sostanze psicoattive (NPS) è un fenomeno mondiale sempre crescente. Ogni anno vengono introdotte nuove sostanze nel mercato della droga come alternative legali alle sostanze controllate dalla legge. L’identificazione di queste nuove sostanze in matrici biologiche rappresenta una continua sfida per i laboratori di analisi. È estremamente importante sviluppare metodologie analitiche in grado di identificare sostanze sconosciute consentendone il monitoraggio e fornendo informazioni scientifiche riguardo la farmacocinetica, possibili range di tossici

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25

Kolluri, Murali Mohan. "Developing a validation metric using image classification techniques." University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1406819893.

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26

Zaffino, C. "EXPLOITING THE POTENTIALITY OF SURFACE-ENHANCED RAMAN SCATTERING (SERS) FOR THE IDENTIFICATION OF NATURAL DYES IN ANCIENT TEXTILES: FROM HYPHENATED TECHNIQUES TO IN-SITU ANALYSIS." Doctoral thesis, Università degli Studi di Milano, 2015. http://hdl.handle.net/2434/332247.

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Surface-enhanced Raman scattering (SERS) is nowadays a well-assessed spectroscopic tool for the identification of historical natural dyes in the scientific community of analytical chemists, even if not yet entirely established in the common practice of laboratories devoted to the chemical characterization of works of art. This technique is based on the enhancement of Raman bands that takes place when a molecule is placed in the proximity of, or possibly adsorbed on, a roughened metal surface, provided by a pre-treated electrode, a metal colloid or a metal thin film. Silver is the most frequ

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27

Amaral, Juliano Geraldo. "Estudos das variações sazonais e intrapopulacional dos metabólitos secundários majoritários das folhas de \'Eremanthus glomerulatus Less\' (Asteraceae)." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/60/60138/tde-02102008-163904/.

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O trabalho buscou investigar as variações sazonais de metabólitos secundários em Eremanthus glomerulatus Less (Asteraceae). Embora não ser utilizada para fins medicinais esta espécie contem substâncias biologicamente ativas. Para este estudo, foram selecionados dez indivíduos de uma mesma população localizada na região do município de Ibiraci - MG, que durante um período de aproximadamente dois anos (06/2000 a 04/2002) tiveram um de seus ramos coletados mensalmente. Visando a análise das folhas destes ramos uma metodologia para extração e análise de seus metabólitos secundários majoritários po

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28

Van, Huyssteen Rudolph Hendrik. "Comparative evaluation of video watermarking techniques in the uncompressed domain." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71842.

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Thesis (MScEng)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: Electronic watermarking is a method whereby information can be imperceptibly embedded into electronic media, while ideally being robust against common signal manipulations and intentional attacks to remove the embedded watermark. This study evaluates the characteristics of uncompressed video watermarking techniques in terms of visual characteristics, computational complexity and robustness against attacks and signal manipulations. The foundations of video watermarking are reviewed, followed by a survey of existing vide

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29

Khabir, Mohmed Hassan Mohmed. "Numerical singular perturbation approaches based on spline approximation methods for solving problems in computational finance." Thesis, University of the Western Cape, 2011. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_7416_1320395978.

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Options are a special type of derivative securities because their values are derived from the value of some underlying security. Most options can be grouped into either of the two categories: European options which can be exercised only on the expiration date, and American options which can be exercised on or before the expiration date. American options are much harder to deal with than European ones. The reason being the optimal exercise policy of these options which led to free boundary problems. Ever since the seminal work of Black and Scholes [J. Pol. Econ. 81(3) (1973), 637-659], the diff

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30

Schmid, Christina Maria [Verfasser], and C. [Akademischer Betreuer] Barner-Kowollik. "Efficient Switching of RAFT to Hydroxyl Capped Polymers as a Versatile Scaffold for Block Copolymer Synthesis : and their Characterization with Advanced Hyphenated Techniques / Christina Maria Schmid. Betreuer: C. Barner-Kowollik." Karlsruhe : KIT-Bibliothek, 2012. http://d-nb.info/102511437X/34.

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31

Cabir, Hassane Natu Hassane. "A Comparison Of Different Recommendation Techniques For A Hybrid Mobile Game Recommender System." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12615173/index.pdf.

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As information continues to grow at a very fast pace, our ability to access this information effectively does not, and we are often realize how harder is getting to locate an object quickly and easily. The so-called personalization technology is one of the best solutions to this information overload problem: by automatically learning the user profile, personalized information services have the potential to offer users a more proactive and intelligent form of information access that is designed to assist us in finding interesting objects. Recommender systems, which have emerged as a solution to

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32

SHAH, MONIKA. "CHARACTERIZATION OF BIOLOGICALLY IMPORTANT VOLATILE AND NON-VOLATILE MOLECULES VIA HETEROATOM DETERMINATION USING CHROMATOGRAPHY AND MASS SPECTROMETRY." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1148309632.

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33

Ferreira, Leandro de Santis. "Análise de variação populacional e caracterização dos metabólitos secundários presentes nas folhas de Lychnophora granmongolense (Duarte) Semir & Leitão Filho." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/60/60138/tde-29042010-121931/.

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Uma das principais características da família Asteraceae é sua capacidade de produzir uma grande diversidade de metabólitos secundários que podem possuir efeitos terapêuticos ou tóxicos. Para verificar a existência de variações inter e intrapopulacionais na sua composição metabólica secundária de Lychnophora granmongolense (Duarte) Semir & Leitão Filho e caracterização desses metabólitos foi desenvolvida uma metodologia analítica em CLAE DAD. Essa metodologia permitiu a identificação de três compostos, vicenina-2, quercetina e pinocembrina, através da coinjeção de padrões, ou seja, pela compa

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34

Kass, Guy. "Perturbations singulières de problèmes d'évolution linéaires." Nancy 1, 1988. http://www.theses.fr/1988NAN10038.

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La solution du problème perturbé d'ordre 1 : mepsilon uepsilon + u'epsilon = fepsilon , uepsilon (O) = uepsilon ::(O), uepsilon appartient à Vepsilon, vérifie l'estimation à priori. |uepsilon ||vepsilon + ||u'epsilon ||v'epsilon <ou= c (||fepsilon ||v'epsilon + ||uepsilon ::(O)||H), il en découle que si on a la convergence propre des données initiales du problème perturbé vers celles du problème initial, alors on a la convergence propre des solutions du problème perturbé vers celle du problème initial. La solution du problème perturbe d'ordre 2 : mepsilon uepsilon + u'epsilon = fepsilon , ueps

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35

Qvarnström, Johanna. "On the reliability of methods for the speciation of mercury based on chromatographic separation coupled to atomic spectrometric detection." Doctoral thesis, Umeå universitet, Kemi, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-111.

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This thesis deals with the reliability of methods for the speciation of mercury in environmental and biological samples. Problems with speciation methods that couple chromatography to atomic spectrometric detection and how to overcome the problems are discussed. Analytical techniques primarily studied and evaluated are high performance liquid chromatography-cold vapour-atomic absorption spectrometry (HPLC-CV-AAS), HPLC-inductively coupled plasma-mass spectrometry (HPLC-ICP-MS), capillary electrophoresis-ICP-MS (CE-ICP-MS) and gas chromatography-ICP-MS (GC-ICP-MS). Applying a multi-capillary ap

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36

Neto, Leonardo Gobbo. "Emprego de técnicas hifenadas na identificação de metabólitos secundários de \'Lychnophora ericoides\' Mart. (Asteraceae) e determinação de suas variações populacionais e temporais." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/60/60138/tde-02102008-165058/.

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A análise pelas técnicas hifenadas CLAE-DAD-EM e CLAE-DAD-EM/EM de extratos foliares de Lychnophora ericoides Mart. levou à identificação de 34 metabólitos secundários diretamente a partir dos extratos vegetais. Destes, 19 foram relatados pela primeira vez na subtribo Lychnophorinae. Uma metodologia para extração e análise destes metabólitos por CLAE-DAD foi desenvolvida, validada e utilizada para determinação de suas variações populacionais e temporais. Perfis metabólicos bem semelhantes, com diferenças quantitativas, mas não qualitativas, foram observados entre os indivíduos de uma mesma pop

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37

Koski, Antti E. "Rapid frequency estimation." Worcester, Mass. : Worcester Polytechnic Institute, 2006. http://www.wpi.edu/Pubs/ETD/Available/etd-032806-165036/.

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Thesis (M.S.)--Worcester Polytechnic Institute.<br>Keywords: DSS; ECM; SVD; Singular Value Decomposition; rapid frequency estimation; frequency estimation. Includes bibliographical references (leaves 174-177).

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Moussai, Madani. "Continuite de certains operateurs integraux singuliers sur les espaces de besov." Paris 7, 1987. http://www.theses.fr/1987PA077016.

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On s'interesse a des conditions necessaires et suffisantes de continuite-l**(2) (resp. Continuite - besov b**(s)::(p,q)), des commutateurs entre les operateurs pseudo-differentiels o. P. D. De type s**(11,a); a1 (resp. S**(11,0)), et les fonctions dont les gradients sont bornes (resp. Des multiplicateurs de besov m(b**(s)::(p,q))). La continuite - besov du commutateur a l'aide du critere de lemarie, mene a etudier la continuite des o. P. D. De type s**(01,0) sur m(b**(sp,q)): les o. P. D. D'ordre 0 sont bornes sur les versions "localisees l**(e") de b**(s)::(p,q), par consequent sur m(b**(s)::

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39

Arrouk, Khaled. "Techniques de conception assistée par ordinateur (CAO) pour la caractérisation de l'espace de travail de robots manipulateurs parallèles." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2012. http://tel.archives-ouvertes.fr/tel-00766814.

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Les environnements CAO fournissent des outils puissants pour la programmation graphique et la manipulation d'entités géométriques complexes. Dans cette thèse, nous proposons d'exploiter ce potentiel dans le domaine de la conception de robots parallèles. Ces robots sont considérés comme une alternative intéressante vis-à-vis de leurs homologues sériels dans différentes applications comme le " pick and place " et l'usinage. Cependant, leur utilisation industrielle est encore restreinte en raison d'un espace de travail limité, de modèles géométriques difficiles à résoudre et l'existence de config

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40

Ben-Kiran, Taoufiq. "Étude d'un problème de perturbation singulière elliptique non classique." Nancy 1, 1989. http://www.theses.fr/1989NAN10040.

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On construit des exemples de problèmes de perturbation singulière elliptique non classique (dans le problème limite, l'opérateur différentiel, et l'opérateur frontière sont d'ordre 2) dans lesquels les données du problème perturbé convergent vers les données du problème limité, tandis que le problème limité n'a pas de solution. On montre que la solution du problème perturbé, bien posé, diverge dans des espaces convenables et on donne des estimations de l'ordre de divergence

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41

Bacha, Inès. "Traitement symbolique des systèmes d'équations différentielles non linéaires au voisinage des singularités." Université Joseph Fourier (Grenoble), 1997. http://www.theses.fr/1997GRE10078.

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Cette these se rattache a l'etude locale des equations differentielles, elle est composee de trois parties dependantes. Dans la premiere partie, nous presentons differentes theories telles que les formes normales, les transformations quasi-monomiales ainsi que celle du polygone de newton afin de mettre en place un algorithme pour simplifier les systemes planaires d'equations differentielles au voisinage des singularites isolees. Cet algorithme se base essentiellement sur les travaux d'a. Bruno sur les solutions locales des systemes d'equations differentielles. Quelques exemples d'application s

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Flis, Paulna. "Développement de méthodes analytiques pour une spéciation à grande échelle des composés métalliques dans les plantes." Thesis, Pau, 2013. http://www.theses.fr/2013PAUU3023/document.

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De nombreux métaux tels que, par exemple le Zn, le Fe, le Cu ou le Ni jouent un rôle essentiel dans la croissance et le développement normal des plantes car ils sont impliqués dans différents processus physiologiques pouvant être cependant perturbés par une carence ou un excès en métaux. Par conséquent, afin de réguler l'absorption des métaux, leur translocation et leur accumulation, les plantes ont développé des mécanismes divers, comme la production de métabolites de faible poids moléculaire pouvant se lier aux métaux. La connaissance de ces complexes métalliques et des processus qu'ils subi

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Barles, Guy. "Contribution à la théorie des solutions de viscosité des équations de Hamilton-Jacobi du premier ordre et applications à des problèmes de contrôle optimal et de perturbations singulières." Paris 9, 1988. https://portail.bu.dauphine.fr/fileviewer/index.php?doc=1988PA090004.

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Nous présentons dans ce travail divers résultats concernant les équations de Hamilton-Jacobi du premier ordre ainsi que leurs applications à certains problèmes de contrôle optimal déterministe et de perturbations singulières. La première partie est consacrée à l'étude des solutions continues: nous donnons divers résultats d'existence, d'unicité et de régularité à la fois locale et globale). La deuxième partie décrit une étude systématique des solutions discontinues: elle fournit une approche générale très simple des problèmes de temps de sortie, de contrôle non-borne et de perturbations singul

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Kaiser, Robert. "Polynomiale Kollokations-Quadraturverfahren für singuläre Integralgleichungen mit festen Singularitäten." Doctoral thesis, Universitätsbibliothek Chemnitz, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-229930.

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Viele Probleme der Riss- und Bruchmechanik sowie der mathematischen Physik lassen sich auf Lösungen von singulären Integralgleichungen über einem Intervall zurückführen. Diese Gleichungen setzen sich im Wesentlichen aus dem Cauchy'schen singulären Integraloperator und zusätzlichen Integraloperatoren mit festen Singularitäten in den jeweiligen Kernen zusammen. Zur numerischen Lösung solcher Gleichungen werden polynomiale Kollokations-Quadraturverfahren betrachet. Als Ansatzfunktionen und Kollokationspunkte werden dabei gewichtete Polynome und Tschebyscheff-Knoten gewählt. Die Gewichte sind so g

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Bendraou, Youssef. "Détection des changements de plans et extraction d'images représentatives dans une séquence vidéo." Thesis, Littoral, 2017. http://www.theses.fr/2017DUNK0458/document.

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Les technologies multimédias ont récemment connues une grande évolution surtout avec la croissance rapide d'internet ainsi que la création quotidienne de grands volumes de données vidéos. Tout ceci nécessite de nouvelles méthodes performantes permettant d'indexer, de naviguer, de rechercher et de consulter les informations stockées dans de grandes bases de données multimédia. La récupération de données basée sur le contenu vidéo, qui est devenue un domaine de recherche très actif durant cette décennie, regroupe les différentes techniques conçues pour le traitement de la vidéo. Dans le cadre de

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Stolovitch, Laurent. "Classification analytique de champs de vecteurs." Université Joseph Fourier (Grenoble), 1994. http://www.theses.fr/1994GRE10243.

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Cette these a pour objet l'etude des champs de vecteurs analytiques au voisinage d'un point singulier en dimension quelconque. Elle est composee de deux articles. Le premier montre l'existence de varietes analytiques invariantes d'un champ de vecteurs sous des hypotheses de petits diviseurs diophantiens et de resonnances positives. Dans le cas de la dimension 2, nous retrouvons les resultats de dulac. Le deuxieme etudie les champs de vecteurs 1-resonnant. Nous y etudions la linearisation de systemes non-lineaires a singularite irreguliere. Nous montrons l'existence de transformations analytiqu

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Yang, Jie. "Solving Partial Differential Equations by Taylor Meshless Method." Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0032/document.

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Le but de cette thèse est de développer une méthode numérique simple, robuste, efficace et précise pour résoudre des problèmes d'ingénierie de grande taille à partir de la méthode Taylor Meshless (TMM) et fournir de nouvelles idées principales de TMM est d'utiliser comme fonctions de forme des polynômes d'ordre élevé qui sont des solutions approchées de l'EDP. Ainsi la discrétisation ne concerne que la frontière. Les coefficients de ces fonctions de forme sont obtenus en discrétisant les conditions aux limites par des procédures de collocation associées à la méthode des moindres carrés. TMM es

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Ayvazyan, Vigen. "Etude de champs de température séparables avec une double décomposition en valeurs singulières : quelques applications à la caractérisation des propriétés thermophysiques des matérieux et au contrôle non destructif." Thesis, Bordeaux 1, 2012. http://www.theses.fr/2012BOR14671/document.

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La thermographie infrarouge est une méthode largement employée pour la caractérisation des propriétés thermophysiques des matériaux. L’avènement des diodes laser pratiques, peu onéreuses et aux multiples caractéristiques, étendent les possibilités métrologiques des caméras infrarouges et mettent à disposition un ensemble de nouveaux outils puissants pour la caractérisation thermique et le contrôle non desturctif. Cependant, un lot de nouvelles difficultés doit être surmonté, comme le traitement d’une grande quantité de données bruitées et la faible sensibilité de ces données aux paramètres rec

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Gras, RL. "Spectroscopic detection and hyphenated techniques in microfluidic enabled gas chromatography." Thesis, 2018. https://eprints.utas.edu.au/30041/1/Gras_whole_thesis_ex_pub_mat.pdf.

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This thesis introduces newly innovated techniques and associated novel method developments in gas chromatography. There are two major emphases presented in this work: The first emphasis is in improving selectivity, sensitivity, and portability of analytical instrumentation with the use of molecular spectroscopy technique as a gas phase detector. Performance, benefit, and impact of using spectroscopic techniques with focus on ultraviolet (UV) detection were investigated first with a gas phase photometer and subsequently with a diode array detector. As a selectable multiwavelength UV based det

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Mnatsakanyan, Mariam. "Natural antioxidants and high performance liquid chromatography (HPLC) hyphenated screening techniques." Thesis, 2010. http://handle.uws.edu.au:8081/1959.7/496789.

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Reactive intermediates in the oxidative processes are among the major sources of primary catalysts that initiate oxidation in vivo and in vitro; a process that is one of the major causes of food quality deterioration and generation of chronic diseases. Antioxidants, both natural and synthetic, have been widely used at legal limits in food, medical and personal care industries. However, recently, the use of synthetic antioxidants has been severely restricted because of the evidence that suggests they may be harmful to human health. As such, the importance of screening naturally occurring altern

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