Dissertations / Theses on the topic 'Stabilisateur'
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Bujard, Cédric. "Sous-groupes finis des groupes de stabilisateur étendus de Morava." Phd thesis, Université de Strasbourg, 2012. http://tel.archives-ouvertes.fr/tel-00699844.
Full textBachta, Waël. "Chirurgie cardiaque à coeur battant : Conception et commande d’un stabilisateur cardiaque actif." Université Louis Pasteur (Strasbourg) (1971-2008), 2008. https://publication-theses.unistra.fr/public/theses_doctorat/2008/BACHTA_Wael_2008.pdf.
Full textBeating heart artery bypass grafting is nowadays possible thanks to the use of passive mechanical stabilizers. These devices however exhibit an important residual motion, incompatible with the required surgical accuracy. In this work, the active stabilization approach is proposed: actuation is integrated in the cardiac stabilizer, and the residual motion of the area of interest is canceled using an exteroceptive measurement to feed a control loop. First the interaction between the myocardium and a passive stabilizer is analyzed. Then two active stabilizers, composed of compliant joints and piezo actuators, are proposed. Finally, The H_infinity methodology is used to design efficient control laws in order to achieve the stabilization of the area of interest. A predictive controller using a novel prediction algorithm is highlighted
Bachta, Waël Gangloff Jacques. "Chirurgie cardiaque à coeur battant conception et commande d'un stabilisateur cardiaque actif /." Strasbourg : Université de Strasbourg, 2009. http://eprints-scd-ulp.u-strasbg.fr:8080/1042/01/BACHTA_Wael_2008.pdf.
Full textLucchini, Arteche Giancarlo. "Groupe de Brauer des espaces homogènes à stabilisateur non connexe et applications arithmétiques." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112207/document.
Full textThis thesis studies the unramified Brauer group of homogeneous spaces with non connected stabilizer and its arithmetic applcations. In particular, we develop different formulas of algebraic and/or arithmetic nature allowing an explicit calculation, both over a finite field and over a field of characteristic 0, of the algebraic part of the unramified Brauer group of a homogeneous space G\G' under a semisimple simply connected linear group G' with finite stabilizer G. We also give examples of the calculations that can be done with these formulas. For achieving this goal, we prove beforehand (using a theorem of Gabber on alterations) a result describing the prime-to-p torsion part of the unramified Brauer group of a smooth and geometrically integral variety V over a global field of characteristic p or over a finite field by evaluating the elements of Br(V) at its local points. The formulas for finite stabilizers are later generalised to the case where the stabilizer G is any linear algebraic group using a reduction of the Galois cohomology of the group G to that of a certain finite subquotient.Finally, for a global field K and a finite solvable K-group G, we show under certain hypotheses concerning the extension splitting G that the homogeneous space V:=G\G' with G' a semi-simple simply connected K-group has the weak approximation property (the hypotheses ensuring the triviality of the unramified algebraic Brauer group). We use then a more precise version of this result to prove the Hasse principle forhomogeneous spaces X under a semi-simple simply connected K-group G' with finite solvable geometric stabilizer, under certain hypotheses concerning the K-kernel (or K-lien) defined by X
Nguyêñ, Huũ Tuyên. "Etude expérimentale de l'influence de la géométrie de stabilisateur sur le développement d'une flamme non prémélangée." Ecully, Ecole centrale de Lyon, 1999. http://bibli.ec-lyon.fr/exl-doc/TH_T1788_htnguyen.pdf.
Full textThe objective of this work was to point out the influence of the aerodynamic behind a bluff-body on the mechanisms of stabilisation of a non premixed flame. This aerodynamic behaviour is controlled not only by the dynamics of the flows but also, and particularly, by the geometry of the stabiliser. This analysis has been developed on a non-confined experimental set-up consisting of two separated and concentric flows (fuel and air), and for two stabilisers, disk and tulip shape burners. Direct visualisations were performed and were completed with velocity field measurements for cold and reacting flows by means of a two-component laser Doppler Anemometer. Temperature fields were also obtained by using a thermocouple. The characterisation of the recirculation zone allowed to bring to light several interesting phenomena: (i) The disk burner induces an important deviation of the annular flow and creates a larger, wider and more intense recirculation zone than the one observed with the tulip burner, for whiçh the effect of the boundary-layer development is predominant, (ii) The competition between the central jet and the recirculating flow, in terms of momentum flux, allows to differentiate the "dominant jet regime" from the "dominant flow regime", (iii) For the reacting flow, the decrease of the density in the zone surrounding the central jet facilitates its penetration, (iv) The effect of the burner shape for the reacting flow can be evaluated in a similar way as for the cold flow: the aerodynamic of the recirculating flow due to the disk enhances stronger perturbations than those generated by the tulip. The analysis of the development of the flame and of its structure has emphasised three main stabilisation regimes (development, ring flame, recirculating flame), two transition regimes and a domain of extinction. To complete this analysis, a study of the "ring flame" regime has been developed. It pointed out that the ring is a triple flame formed at the interface of two flows: a premixed fuel-air-combustion products flow and an air flow
Perrier, Anthony. "efpR, un gène stabilisateur des fonctions de virulence et du métabolisme de la bactérie phytopathogène Ralstonia solanacearum." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30352.
Full textRalstonia solanacearum is a bacterial plant pathogen responsible of the bacterial wilt disease on more than 250 plant species including agronomical crops such as potatoes, tomato and peanuts. It has been reported several times in the literature, the emergence of new pathogenic variants successfully able to infect and induce bacterial wilt disease on previously described resistant plants. To understand the molecular basis of R. solanacearum adaptation to its host, an evolution experiment has been performed in my host team. R. solanacearum has been kept during more than 300 bacterial generations into the stem of several plant species (susceptible, tolerant and resistant plants). At the end of the experiment, the in planta fitness of the derived clones has been tested compared to the ancestral WT strain, and more than 80% of the derived clones had a better fitness. Among them, 50 clones were re-sequenced. Interestingly, 6 independent mutations were found in the same gene of unknown function (renamed efpR), this strongly suggesting an evolutionary parallelism. Reverse genetics approaches confirmed that efpR was involved in the in planta fitness gain. The goals of my thesis were (1) to characterize the function of the efpR gene and (2) to better understand its role in the fitness gain of the bacterium. To do so, transcriptomic and metabolic analysis were performed followed by phenotypic validations. We demonstrated that EfpR is a global regulator of R. solanacearum controlling metabolic and virulence functions. We also demonstrated that all the mutations appeared during the evolution experiment were "loss of function" mutations, these mutations also induced a phenotypic heterogeneity phenomenon. Indeed, 2 types of colonies were observable on plates, one type similar to the colonies formed by the WT strain and another type less mucoid. We also highlighted another gene, the RSc3149 gene which is an efpR homolog involved in the phenotypic heterogeneity. Finaly, most of the efpR related phenotypes were strikingly similar of those associated with a well described regulator of the bacterium, the PhcA major regulator. We performed transcriptomic analysis of both regulons coupled with reporter gene fusions analysis to understand if there was a link between these two regulons and if we could position efpR in the regulatory network of R. solanacearum.[...]
Groeneveld, Elisabeth. "Le Polytrichum strictum comme stabilisateur de substrat et plante compagne pour les sphaignes dans la restauration des tourbières exploitées par aspirateur /." Online version, 2002. http://www.gret-perg.ulaval.ca/GROENEVELD%E%MSc.pdf.
Full textVert, Rénald. "Propriétés magnétiques et structurales des composés magnétiques anisotropes de la famille RFe12-xMxZy (R= élément de terre rare, M = élément stabilisateur, Z = élément interstitiel)." Université Joseph Fourier (Grenoble), 1999. http://www.theses.fr/1999GRE10220.
Full textKaramanov, Nasko. "A propos de la cohomologie du deuxième groupe stabilisateur de Morava : Application aux calculs de π* (Lk(2)V(0)) et du groupe Pic2 de Hopkins." Université Louis Pasteur (Strasbourg) (1971-2008), 2006. https://publication-theses.unistra.fr/public/theses_doctorat/2006/KARAMANOV_Nasko_2006.pdf.
Full textGagne, Julien. "Exploitation de l’effet gyroscopique pour la stabilisation active de l’épicarde : vers une chirurgie des coronaires à coeur battant." Strasbourg, 2011. http://www.theses.fr/2011STRA6079.
Full textActual passive stabilizers used in cardiac surgery does not constrain enough the heart surface to guarantee a proper stabilization. An adaptable device is proposed allowing to actively compensate for residual displacement in real time thanks to Control Moment Gyroscope (CMG) actuation; able to generate a gyroscopic torque without grounding constraint. The use of an accelerometer for measurement allows also to free from external reference. The working principle and the model are described as well as the design approach. The technical aspects for the realization of the first prototype, called GyroLock, are detailed. Measurement noise and potential model parameters errors are significant and should be considered in the choice of the control method. Using a CMG includes also specific additional constraints. Two control approaches are considered : a control based on a Kalman observer including a disturbance model and an adaptive control using correlation principle. Simulations highlight the theoretical efficiency of both methods. Table experiments show the limitations of the observer approach in this case. The adaptive method is more efficient thanks to a better robustness concerning model parameters errors. Finally, the device using adaptive control has been successfully tested on a pig in real conditions, validating the proposed approach. A preliminary study concerning the motion compensation for two directions is presented at the end
Imhof, Kilian. "Wechselspannungs-Stabilisator /." Sion, 2007. http://doc.rero.ch/record/10762?ln=fr.
Full textIyer, Sridharan Pavithran. "Complexité du décodage des codes stabilisateurs quantiques." Mémoire, Université de Sherbrooke, 2014. http://hdl.handle.net/11143/5388.
Full textNganga, Irungu William. "Essais sur la dynamique de la soutenabilité de la dette du Kenya." Thesis, Paris 8, 2018. http://www.theses.fr/2018PA080024/document.
Full textExisting literature on debt sustainability emphasizes the existence of a threshold or a tipping point beyond which debt compromises growth and destabilizes the economy. This Ph.D. thesis goes beyond threshold testing and presents three additional approaches which could be used to further interrogate debt dynamics. Using annual time series data from 1963 to 2015, and employing a Structural Vector Autoregressive Model (SVAR), Markov switching models (MS) and Self-Exciting Threshold Autoregressive models (SETAR) for robustness, the three chapters cross-examine Kenya’s debt sustainability, by addressing three questions: First chapter, is the fiscal policy response to macroeconomic shocks consistent with a sustainable debt trajectory? The second chapter, given that the fiscal response may deviate from the sustainable path in the short-run, are these deviations systematically corrected in the long run? The third chapter, to what extent does coordination between monetary and fiscal policy, if any, alleviate or exacerbate debt sustainability in the long run? The results obtained confirm the following: (i) The primary balance reacts to macroeconomic shocks in a manner consistent with debt sustainability (ii) Fiscal consolidation might be counterproductive as a response to debt management. (iii) Debt drives growth in Kenya. (iv) Both sustainable and unsustainable fiscal regimes are dominant with each lasting an average of four years, while the No-Ponzi game condition weakly holds in the Kenyan economy in the long run. (v) The persistence of unsustainability regime for more than four years could threaten long-run fiscal sustainability
Lader, Olivier. "Une résolution projective pour le second groupe de Morava pour p ≥ 5 et applications." Phd thesis, Université de Strasbourg, 2013. http://tel.archives-ouvertes.fr/tel-00875761.
Full textErcolanelli, Julien. "Étude numérique et expérimentale d'un système couplé stabilisateur et récupérateur d'énergie des vagues Experimental and numerical investigation of sloshing in anti-roll tank using effective gravity angle Experimental and numerical assessment of the performance of a new type passive anti-roll stabilisation system." Thesis, Brest, École nationale supérieure de techniques avancées Bretagne, 2019. http://www.theses.fr/2019ENTA0008.
Full textGeps Techno's development is based on an innovative concept of a floating structure intended to produce electrical energy from several renewable marine energy sources, including wave power. The wave power system developed by Geps Techno is based on circulating water and creating a vortex within it. By taking advantage of the liquid hull phenomenon, the concept can also be used as a stabilization system for a ship or any other floating platform. The short-term objective of the company is the development of this technology allowing the stabilization and recovery of wave energy and for which there remain technological obstacles to be removed in order to achieve the viability and profitability of the system. To do this, in October 2015 Geps Techno launched the IHES (Integrated Harvesting Energy System) project, which consists of building a demonstrator of its wave power platform concept. The IHES project is one of the projects of the roadmap of the "Ecological ships" plan of New Industrial France. It is supported by Bpifrance within the framework of the Investments for the Future - Industrial Projects for the Future program. In order to master the objectives of stabilization and energy recovery, Geps Techno is studying the technological aspects necessary to switch from the energy available at wave level to that available at the wave turbine turbine. The Ph.D. thesis work supported by Fourestier in May 2017 focused on a first part "Definition and control of internal flows in the wave power system". Using CFD modeling, the latter resulted in operational models characterizing internal flows. This Cifre Ph.D. thesis follows on from Fourestier's work and deals with a second part "Modeling of the coupled platform / wave power system". All of this work should lead to an operational computer code correlated with experimental results making it possible to study the internal flow and the behavior of the float subjected to swell
Mauran, Laura. "Foldamères stabilisateurs d’hélices peptidiques : Applications à l’inhibition d’interactions protéine-protéine." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0908.
Full textΑ-Helices are key elements of biomolecular recognition, as reflected by the fact that a large fraction of the protein-protein complexes in the Protein Data Bank (PDB) feature helical interfaces. However, short isolated peptide helices are generally only weakly populated in aqueous environment and are sensitive to proteolytic degradation, thus limiting their therapeutic potential. Various chemical approaches have been proposed to increase the helix folding propensity of α-peptides. One strategy is to pre-organize the first amide bonds through the use of a "capping box" or a hydrogen bond surrogate. Recently we became interested by the possibility to interface peptide and foldamer helical backbones in order to develop “block co-foldamers“, to generate new generations of α-helix mimics. In our laboratory, we have developed oligourea foldamers which are organized to form helical structures. The similarities in helix screw sense, pitch, and polarity between the peptide α-helix and the oligourea 2.5-helix suggested that it would be feasible to combine these two backbones. In this thesis, we have shown that the resulting oligourea/α-peptide chimeras form well-defined helical structures in polar organic solvents with the propagation of a continuous intramolecular hydrogen bonding network spanning the entire sequence. These studies provided a rationale for the use of the oligourea backbone which is strongly biased towards helix formation could lead to the development of pre-organized caps for the initial four amide NHs and the final four carbonyl groups of a peptide α-helix. We have therefore studied the influence of short oligourea fragments on the stabilization of model water-soluble peptide sequences in α-helices, leading to the development of the foldamer capping box. This strategy awas pplied for the first time to the design of potent inhibitors of protein/protein interactions (e.g. p53/MDM2)
Rubbert, Lennart. "Conception de mécanismes compliants pour la robotique chirurgicale." Phd thesis, Université de Strasbourg, 2012. http://tel.archives-ouvertes.fr/tel-00801892.
Full textMassicot, Jean-Cyrille. "Groupes approximatifs en théorie des modèles." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1164/document.
Full textA symmetric subset X in a group G is a K-approximate subgroup if there exists a finite set E ⊂ G of cardinality K such that X2 ⊂ E.X. The study of approximate subgroups in multiplicative combinatorics experienced a significate advance through the use of model theory. In 2009, Hrushovski showed that an ultralimit of finite approximate subgroups has a model-theoretic connected component, thus a locally compact quotient X/H. Using the results of Gleason and Yamabe about Hilbert’s fifth problem, this allows the construction of a morphism to a Lie group, and deduce some results about nilpotency. This lead to the theorem of Breuillard, Green and Tao classifying all finite approximate subgroups, using a combinatorial construction of the quotient X/H. In this thesis, we are intersested in the conditions needed to construct a type definable subgroup H of bounded index in X. This implies the existence of a locally compact quotient.We show that the combinatorial construction of Breuillard, Green and Tao can be seen in a definable way, and give a generalisation to all definably amenable approximate subgroups. Also, we show that if H is type-definable in a language L∗, then it is possible to construct a subgroup H which is type-definable in a reduct L, still with bounded index. Thus the existence of a subgroup H does not depend on the choice of a base language
Rostaing-Paris, Sabrina. "Pacte de stabilité et de croissance et stabilisateurs budgétaires automatiques dans la zone euro." Bordeaux 4, 2008. http://www.theses.fr/2008BOR40026.
Full textSince many countries have adopted fiscal discipline rules, firsts in the framework of the Maastricht Treaty then of the Stability and Growth Pact, the automatic fiscal stabilisation issues has beeng permanently back on the forefront of the scene. Ence, we must see the compaibility between this rules and the evolution of automatic stabilizers en EMU countries. Generaly, since the adoption of this rules, we show the size of automatic stabilizers has not been reduced and even has increased. In a second point, we show the automatic stabilizers prevent largely from the respect of the fiscal discipline. Finaly, the rules of a reformed Pact are taken in account. We consider a structural budget balance in equilibrium target, a golden rule a public finances and a public debt criterium. We show the only structural balance target would be respected
Poulin, Caroline. "Évaluation d'un programme d'exercices préventifs de renforcement des stabilisateurs de l'épaule chez le triathlète /." Thèse, Trois-Rivières : Université du Québec à Trois-Rivières, 2007. http://www.uqtr.ca/biblio/notice/resume/30042201R.pdf.
Full textPoulin, Caroline. "Évaluation d'un programme d'exercices préventifs de renforcement des stabilisateurs de l'épaule chez le triathlète." Thèse, Université du Québec à Trois-Rivières, 2007. http://depot-e.uqtr.ca/1456/1/030042201.pdf.
Full textMekki, Kérim. "Mesures synchronisées par GPS pour une meilleure stabilité des réseaux." Phd thesis, Grenoble INPG, 2002. http://tel.archives-ouvertes.fr/tel-00491388.
Full textSteng, Michaela. "Synthese, Charakterisierung und Eigenschaften von fluorhaltigen amphipolaren Polymeren als Additive für Polyurethanhartschäume." [S.l. : s.n.], 2002. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB9832222.
Full textChiappori, Guido Jose. "Système de stabilisation de la tension batterie pour la fonction Stop-Start automobile : solution à composants de puissance commandés en linéaire." Thesis, Ecole centrale de Lille, 2015. http://www.theses.fr/2015ECLI0005/document.
Full textThis thesis presents a new Linear Voltage Stabilization System (LVSS) specially designed for µ-hybrid vehicles using the Stop-Start function. The LVSS stabilizes the battery voltage during the start-up of the Internal Combustion Engine (ICE) limiting the start-up current using parallels MOSFETs working in linear mode. A prototype was developed and tested in a car. Results have shown the battery voltage properly stabilized limiting the start-up current. Furthermore the proposed solution does not impact on the overall performance of the Stop-Start. Main advantages are its small volume, low price and the fact that there is no EMC perturbation as transistors work in linear mode
Peiseler, Beate Hanna. "Stabilisateurs membranaires d'origine bactérienne en série hopane : nouveaux biohopanoïdes, implications biogénétiques et transformations dans un segment récent." Mulhouse, 1992. http://www.theses.fr/1992MULH0224.
Full textMatar, Merheb Rachel Rima. "Caractérisation d’une nouvelle génération de détergents stabilisateurs des transporteurs abc en solution : cristallisation de BmrA, transporteur ABC bactérien." Thesis, Lyon 1, 2010. http://www.theses.fr/2010LYO10303.
Full textDue to their preponderance in the resistance to chemotherapies, the MDR ABC transporters have drawn the attention of the scientific community. Our project aimed at finding conditions in which ABC transporters are active in solution to lead the crystallization of these proteins in an active conformation. In this purpose, we conceived and developed a new class of detergents, based on calix[4]arene ring, that stabilize these proteins. In order to solve the 3D-structure to atomic resolution of bacterial ABC transporter “BmrA” responsible for antibiotic resistance, we used a classical approach with commercial detergents in addition to the innovative ones. We have crystallized the protein in presence of Foscholine 12 with a diffraction resolution up to 5 Å. The data was incomplete; solving partially the structure of the transmembrane domains. On the other hand, we have reached the objective of extraction, purification and stabilization of this transporter by using calix[4]arene-based detergents. We have also shown that these detergents promote and enhance the kinetics of crystallization of BmrA, a step that we are improving, to get crystals of better resolution, for resolving the BmrA 3D-structure which will be used to design adapted inhibitors
Duclos-Cianci, Guillaume. "Outils de calcul quantique tolérant aux fautes." Thèse, Université de Sherbrooke, 2015. http://hdl.handle.net/11143/6770.
Full textLe, Goff Maëlan. "Migrant remittances, foreign aid and development of recipient countries." Thesis, Clermont-Ferrand 1, 2012. http://www.theses.fr/2012CLF10398.
Full textThis dissertation examines the effects of migrant remittances on the development of origin countries and compares these effects with those of official development aid. In a first part we investigate the effects of remittances on the development of recipient countries. Results suggest that remittances reduce within inequality in countries more developed, where migration cost are lower and the share of skilled migrants less important (Chapter 1). Their impact on growth in sub-Saharan Africa is also non-Linear and depends positively on the financial and institutional development of recipient economies (Chapter 2). Finally, remittances have a real exchange appreciation effect in CFA countries, but not in countries with a flexible exchange rate regime (Chapter 3). In a second part we focus on the stabilizing impact of remittances. Chapter 4 shows, at the microeconomic level, that remittances have played an insurance role during the last financial crisis and that this role was all the more acute that migrants have not strongly suffered from the crisis and that family links were strong. Chapter 5 suggests in a country-By-Country approach that remittances are pro-Cyclical in a higher number of cases, while on average, they respond negatively to the home country income. Chapter 6 findings show that remittances dampen the harmful impact of trade instability on poverty. In a third part, we compare migrant remittances with public aid. While public aid mitigates the harmful impact of export instability on output growth, migrant remittances dampen the harmful effect of export instability on poverty (Chapter 7). Finally, migrant remittances reduce aid dependency in countries where remittances are invested rather than consumed (Chapter 8)
Bujard, Cédric. "Finite subgroups of the extended Morava stabilizer groups." Thesis, Strasbourg, 2012. http://www.theses.fr/2012STRAD010/document.
Full textThe problem addressed is the classification up to conjugation of the finite subgroups of the (classical) Morava stabilizer group S_n and the extended Morava stabilizer group G_n(u) associated to a formal group law F of height n over the field F_p of p elements. A complete classification in S_n is provided for any positive integer n and prime p. Furthermore, we show that the classification in the extended group also depends on F and its associated unit u in the ring of p-adic integers. We provide a theoretical framework for the classification in G_n(u), we give necessary and sufficient conditions on n, p and u for the existence in G_n(u) of extensions of maximal finite subgroups of S_n by the Galois group of F_{p^n} over F_p, and whenever such extension exist we enumerate their conjugacy classes. We illustrate our methods by providing a complete and explicit classification in the case n=2
Guilment, Jean. "Contribution à l'étude des processus photographiques dans les halogénures d'argent par spectrométrie Raman et de fluorescence : influence de produits stabilisateurs et antivoiles, relation avec l'effet Raman exalté de surface (SERS)." Paris 6, 1986. http://www.theses.fr/1986PA066287.
Full textGuilment, Jean. "Contribution à l'étude des processus photographiques dans les halogénures d'argent par spectométrie Raman et de fluorescence influence de produits stabilisateurs et antivoiles, relation avec l'effet Raman exalté de surface (SERS)." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37598161g.
Full textAlkhatib, Hasan. "ETUDE DE LA STABILITE AUX PETITES PERTURBATIONS DANS LES GRANDS RESEAUX ELECTRIQUES : OPTIMISATION DE LA REGULATION PAR UNE METHODE METAHEURISTIQUE." Phd thesis, Université Paul Cézanne - Aix-Marseille III, 2008. http://tel.archives-ouvertes.fr/tel-00408160.
Full textDietrich, Sascha. "(Metallo-)Dendrimers in Catalysis, Nanoparticle Stabilization and Biological Application." Doctoral thesis, Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-82016.
Full textPasselergue, Jean-Christophe. "Interactions des dispositifs FACTS dans les grands réseaux électriques." Phd thesis, Grenoble INPG, 1998. http://www.theses.fr/1998INPG0148.
Full textPower fiow increase and environmental constraints in power Systems hâve led to FACTS (Flexible AC Transmission Systems) devices insertion in order to improve the power System exploitation. Thèse devices are able to cany out some funétions such as the voltage support, the power transfer control and the increase of power transfer capability. Moreover, due to their fast response time, they are an efficient tool for damping low frequency oscillations. This new FACTS devices application is important as power Systems are more and more interconnected and thereby more sensitive to inter-area eîectromechanical oscillations. However, the recourse to several FACTS devices in a power System requires the careful study of the possible controller interaction phenomena between FACTS devices and with others system éléments. This thesis deals with the analysis and resolution of dynamic phenomena due to interaction problems resulting from the insertion of one or several shunt FACTS devices. Sensitivity and influence indices are defined from the controllability and observability notions, respectively, in order to preview the interaction phenomena importance due to a FACTS device insertions and to identify the influence areas of a FACTS device. Thèse indices are applied to a two-area four-machine test system and to a simplified real 29-machine power system. Two coordination methods (" minimax " method and decentralized linear quadratic method) are used to coordinate the FACTS devices themselves and a FACTS device and PSS (Power System Stabilizer) in the two-area four-machine test system
Maurice, Denise. "Codes correcteurs quantiques pouvant se décoder itérativement." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066361/document.
Full textQuantum information is a developping field of study with various applications (in cryptography, fast computing, ...). Its basic element, the qubit, is volatile : any measurement changes its value. This also applies to unvolontary measurements due to an imperfect insulation (as seen in any practical setting). Unless we can detect and correct these modifications, any quantum computation is bound to fail. These unwanted modifications remind us of errors that can happen in the transmission of a (classical) message. These errors can be accounted for with an error-Correcting code. For quantum errors, we need to set quantum error-Correcting codes. In order to prevent the clotting of errors that cannot be compensated, these quantum error-Correcting codes need to be both efficient and fast. Among classical error-Correcting codes, Low Density Parity Check (LDPC) codes provide many perks: They are easy to create, fast to decode (with an iterative decoding algorithme, known as belief propagation) and close to optimal. Their quantum equivalents should then be good candidates, even if they present two major drawbacks (among other less important ones). A quantum error correction code can be seen as a combination of two classical codes, with orthogonal parity-Check matrices. The first issue is the building of two efficient codes with this property. The other is in the decoding: each row of the parity-Check matrix from one code gives a low-Weight codeword of the other code. In fact, with quantum codes, corresponding errors do no affect the system, but are difficult to account for with the usual iterative decoding algorithm. In the first place, this thesis studies an existing construction, based on the product of two classical codes. This construction has good theoritical properties (dimension and minimal distance), but has shown disappointing practical results, which are explained by the resulting code's structure. Several variations, which could have good theoritical properties are also analyzed but produce no usable results at this time. We then move to the study of q-Ary codes. This construction, derived from classical codes, is the enlargement of an existing LDPC code through the augmentation of its alphabet. It applies to any 2-Regular quantum code (meaning with parity-Check matrices that have exactly two ones per column) and gives good performance with the well-Known toric code, which can be easily decoded with its own specific algorithm (but not that easily with the usual belief-Propagation algorithm). Finally this thesis explores a quantum equivalent of spatially coupled codes, an idea also derived from the classical field, where it greatly enhances the performance of LDPC codes. A result which has been proven. If, in its quantum form, a proof is still not derived, some spatially-Coupled constructions have lead to excellent performance, well beyond other recent constuctions
Kukula, Hildegard. "Lineare und verzweigte Blockcopolymere aus Polypeptiden und synthetischen Polymeren." Phd thesis, [S.l.] : [s.n.], 2001. http://pub.ub.uni-potsdam.de/2001/0014/kukula.pdf.
Full textJahny, Karsten. "Amphiphile Polyurethan-Makromere als Emulgatoren und Comonomere für die heterophasige Polymerisation hydrophober Monomere." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2002. http://nbn-resolving.de/urn:nbn:de:swb:14-1025614462796-67942.
Full textThis paper describes the synthesis of a reactive amphiphilic polyurethane, and its use as an emulsifier for the emulsion polymerization of styrene. The colloid properties and the structure of the emulsifier in the aqueous phase have been investigated. When the acrylic polymerization is carried out with hydrophobic monomers, we obtain a composite particle structure. The variation of particle size and particle size distribution as a function of the reaction parameters was measured by light scattering methods and Flow-fieldflow-fractionation (F-FFF) . Through investigation by dilatometry and reaction calorimetry it was possible to compare the polymerization process with that of common emulsion polymerization. Solid State NMR analysis allowed us to develop a core-shell model for the composite particle structure, and to determine the presence of an interphase layer between core and shell. Atomic Force Microscopy (AFM) methods were used to characterize the surface of the films, and tapping mode AFM was used to characterize the polymer phase separation on the micro scale
Jahny, Karsten. "Amphiphile Polyurethan-Makromere als Emulgatoren und Comonomere für die heterophasige Polymerisation hydrophober Monomere." Doctoral thesis, Technische Universität Dresden, 2001. https://tud.qucosa.de/id/qucosa%3A24155.
Full textThis paper describes the synthesis of a reactive amphiphilic polyurethane, and its use as an emulsifier for the emulsion polymerization of styrene. The colloid properties and the structure of the emulsifier in the aqueous phase have been investigated. When the acrylic polymerization is carried out with hydrophobic monomers, we obtain a composite particle structure. The variation of particle size and particle size distribution as a function of the reaction parameters was measured by light scattering methods and Flow-fieldflow-fractionation (F-FFF) . Through investigation by dilatometry and reaction calorimetry it was possible to compare the polymerization process with that of common emulsion polymerization. Solid State NMR analysis allowed us to develop a core-shell model for the composite particle structure, and to determine the presence of an interphase layer between core and shell. Atomic Force Microscopy (AFM) methods were used to characterize the surface of the films, and tapping mode AFM was used to characterize the polymer phase separation on the micro scale.
Becker, Holger [Verfasser]. "Polymerisationsinhibierung von (Meth-)Acrylaten : Stabilisator- und Sauerstoffverbrauch / vorgelegt von Holger Becker." 2004. http://d-nb.info/971383421/34.
Full textChicoine, Evelyne. "Effet d’une pré-sollicitation maximale isométrique des muscles stabilisateurs sur la coordination intermusculaire lors d’un exercice pluriarticulaire épuisant." Thèse, 2013. http://hdl.handle.net/1866/10764.
Full textIntroduction: Strategies in order to optimize athlete’s performances are commonly used by coaches and trainers. Post-activation potentiation (PAP), occurring after a pre-activation, is known to be a phenomenon that can lead to an increase in force and power production and thus, performance. The aim of the present study was to describe the effects of a hip stabilizers pre-activation on multi-segment coordination and performance during a fatiguing exercise. Method: Six short-track speed skating athletes (3 males and 3 females; age: 20.2 ± 2.8 years; data reported as mean ± SD) participate in the study were they had to execute 2 sets of 9 blocks of 6 maximal squat jumps with 5 s isometric squats between blocks and 5 min rest between sets without (CON) or with (EXP) a 2x3s unilateral isometric squats against a fixed bar potentiating exercise 5 min before to the first set of 9 blocks intending to target the lower body hip stabilizers, flexors and extensors. Jumping average peak power, EMG amplitude, median frequency, angular velocity and acceleration were measured. The first and last blocks of jumps were recorded for each set. Results: There were no significant difference between conditions, as results showed an overall fatigue state. However, mean frequency showed compensating strategies in left leg muscles in response to fatigue. Conclusion: Hip stabilizers isometric pre-activation did not improve overall performance and coordination on jump squats. However, gluteus maximus and anterior tibialis showed a an improved fatigue resistance in non-dominant leg with pre-activation. Results from this study suggest that pre-activation protocols, while they produce no significant impact on performance, could be relevant for reducing lower-limb movement asymmetry during athlete training and as such, contribute to injury prevention and rehabilitation.
Valentino, Rodolfo [Verfasser]. "Ehe, Familie und andere Lebensgemeinschaften in Spanien : die Familie als sozio-emotionaler Stabilisator und intergenerationeller Konfliktherd / vorgelegt von Rodolfo Valentino." 2010. http://d-nb.info/1001898826/34.
Full textDietrich, Sascha. "(Metallo-)Dendrimers in Catalysis, Nanoparticle Stabilization and Biological Application." Doctoral thesis, 2011. https://monarch.qucosa.de/id/qucosa%3A19636.
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