Tesi sul tema "Kinetic of transformation"
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Massam, Alexandra. "A kinetic model for the transformation of phenol by peroxidase". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0008/MQ50641.pdf.
Brandt, Catharine Jane. "Transformation of the kinetic energy of rainfall with variable tree canopies". Thesis, Royal Holloway, University of London, 1986. http://repository.royalholloway.ac.uk/items/b6beecb7-fb73-4d83-b905-206fccf515d7/1/.
Watkins, Claire. "The Transformation of Electricity in my Brain". VCU Scholars Compass, 2004. http://scholarscompass.vcu.edu/etd/1062.
Träff, Annika. "Asymmetric transformation of ß- and γ-functionalized alcohols : Study of combined ruthenium-catalyzed racemization and enzymatic resolution". Doctoral thesis, Stockholms universitet, Institutionen för organisk kemi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-56947.
At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: In press. Paper 3: Epub ahead of print.
Crouïgneau, Guillaume. "Films de type Ni-Co-Mn-In : élaboration et étude de la transformation magnétostructurale". Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAY048/document.
Ni-Mn-X (X=In, Ga, Sn and Sb) Heusler type alloys present interesting mechanical, magnetical and thermal properties owing to the martensite-austenite structural transition. Combining these properties induce many potentials applications in the field of actuators, sensors and coolers. Processing these materials into films is of great interest for micro-devices but remains a challenge. It shall be the purpose of this thesis. Part of this thesis shall be dedicated to the development of a Ni-Co-Mn-In Heusler film using a co-sputtering process. The main achievement of the thesis is to have obtained a film exhibiting a structural and magnetic transformation at room temperature. After a study of the structure and microstructure of martensite and austenite phases, magnetic properties are investigated. The evolution of the magnetic state during the first order transformation observed in some films leads to interesting magnetocaloric and activating properties. Optimal results, both in terms of working temperature and functional properties, are obtained for a film with a composition of Ni45,2Co4,7Mn36,2In13,9. Resistivity measurements under high magnetic field are novel on such films. These new measurements have made it possible to study the irreversibility and phase transformation blocking induced by a magnetic field (kinetic arrest). Understanding the physical effect underlying the thermal irreversibility and the blocking by a magnetic field is indeed important for applications based on such materials with strongly coupled mechanical, magnetical and thermal properties
Venturato, Giulia. "Modelling the Influence of Phase Transformation Kinetics in 22MnB5 Hot Stamping". Doctoral thesis, Università degli studi di Padova, 2019. http://hdl.handle.net/11577/3424888.
La deformazione di lamiere sta guadagnando, negli ultimi anni, sempre più importanza dal momento che l’industria automobilistica sta richiedendo caratteristiche molto specifiche per la nuova generazione di componenti per la scocca. Le richieste di leggerezza per aumentare il risparmio di carburante sta diventando un fattore chiave per il design di nuovi componenti, ma la leggerezza deve necessariamente essere accoppiata con l’alta resistenza meccanica per garantire la sicurezza dei passeggeri. Uno dei metodi più efficaci per incontrare tali richieste è stato l’utilizzo della nuova generazione di acciai alto resistenziali (HSS), le cui proprietà meccaniche possono essere migliorate grazie ai trattamenti termici. Lo stampaggio a caldo diretto rappresenta una soluzione efficace per questo scopo, grazie alla possibilità di accorciare la catena di processo di molti componenti metallici della scocca dell’auto. Lamiere più sottili vengono impiegate per la produzione di molte parti dell’auto, garantendo le desiderate leggerezza e alta resistenza, per ottenere la resistenza agli urti necessaria a proteggere i passeggeri del veicolo. Lo stampaggio a caldo è, oggigiorno, ampiamente applicato nell’industria automobilistica, ma la ricerca in questo campo è ancora di alto interesse nell’ambiente accademico. Questo è dovuto al fatto che lo stampaggio a caldo coinvolge un’ampia serie di parametri che devono essere accuratamente compresi per migliorare il potenziale del processo e la complessità delle parti stampate. A partire dal primo stage di riscaldamento all’ultima fase di tempra, il materiale subisce una serie di trasformazioni microstrutturali e meccaniche, la cui ottimizzazione e il loro corretto timing controlla le caratteristiche finali del componente. Parallelamente al lavoro di ricerca sperimentale, una grande branca della ricerca è volta allo studio delle simulazioni numeriche che sono di fondamentale importanza per simulare il processo e ottimizzarne ogni step. Il presente lavoro si inquadra nella ricerca nell’ambito dello stampaggio a caldo. Il materiale studiato in questo lavoro è l’acciaio temprabile 22MnB5 rivestito da AluSi®, conosciuto commercialmente con il nome di Usibor 1500 P®. La completa caratterizzazione del materiale ha come scopo di coprire le mancanze nella letteratura nell’ambito dei test ad alta temperatura sulla reologia di tutte le microstrutture, proponendo un modello di fitting per rappresentare i dati nei modelli FE. La formabilità ad alta temperatura è altresì soggetto di studio, analizzando gli effetti della temperatura e della microstruttura nella risultante curva limite di formabilità (FLC). La cinetica di trasformazione di fase è stata oggetto di studio, confermando i dati presentati in letteratura e fornendo le basi per questo lavoro. Infine, il nuovo modello di danneggiamento Generalized Incremental Stress-State dependent damage MOdel (GISSMO) è stato calibrato. L’intera attività sperimentale è stata affiancata alle simulazioni numeriche, per la necessità dell’analisi e calibrazione dei dati. Il lavoro presentato in questa tesi è stato portato avanti nei laboratori del Dipartimento di Ingegneria Industriale, DII, dell’università di Padova, da ottobre 2016 a settembre 2019 sotto la supervisione del prof. Andrea Ghiotti. Questo lavoro è parte del progetto di ricerca dell’Università chiamato “Advanced CAE method to predict failure and material properties in hot forming” ref. 2014-4050 URP Award, sviluppato in collaborazione con Ford Motor Company GMBH.
Moscu, Corcodel Alina. "Structural transformation under reaction conditions of supported PtSn nanoparticles characterized by in situ DRIFTS and kinetic modeling". Thesis, Lyon 1, 2015. http://www.theses.fr/2015LYO10177.
The selective oxidation of CO in the presence of a large excess of H2 (PROX) is considered as a crucial step in the purification of H 2 to be used in low-temperature fuel cells, which are clean sources of energy. The objective of this thesis was to better understand the reaction mechanisms taking place over promising catalysts based on Pt and Sn. Model Pt-Sn catalysts were prepared by a two-step method: (i) synthesis of metallic nanoparticules (NP) in a colloidal suspension followed by (ii) the deposition of these NPs onto a support. The first step of the method enabled to produce well-controlled Pt-Sn NPs in terms of size and composition. However, the NPs were partly destroyed during the deposition step followed by calcination, due to the reoxidation of Sn. The adsorption of CO followed by diffuse reflectance spectroscopy (DRIFTS) was used to characterize the nature of these solids following a reduction, which was able to regenerate an alloyed phase. The DRIFTS analysis enabled to discriminate between Pt in an alloyed phase and Pt on monometallic surfaces. The heat of CO adsorption measured by DRIFTS appeared to be much lower than that associated with the pure Pt phase. Surprinsingly, a segregation of Pt and Sn was observed under a CO/H2 mixture below 175°C. In situ analysis by DRIFTS of the PROX reaction indicated that the Pt-Sn alloy rapidly decomposed in the presence of O2, forming an intimate mixture of Pt and SnOx. No evidence of the presence of Pt -Sn alloyed phases could be obtained under PROX conditions, suggesting that the superior catalytic activity of the Pt –Sn materials were related to the Pt+SnOx mixture. A detailed PROX microkinetic model was developed over Pt+SnOx, based on those relevant to CO oxidation and PROX over pure Pt. This work epitomises the benefits in combining in situ spectroscopic study with kinetic modelling to better understand the structure of catalysts “at work” and reaction mechanisms
Shiraiwa, Manabu [Verfasser]. "Kinetic modeling and experiments on gas uptake and chemical transformation of organic aerosol in the atmosphere / Manabu Shiraiwa". Mainz : Universitätsbibliothek Mainz, 2011. http://d-nb.info/1025263596/34.
Moyano, Garcia Iván. "Controllability of of some kinetic equations, of parabolic degenerated equations and of the Schrödinger equation via domain transformation". Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLX062/document.
This memoir presents the results obtained during my PhD, whose goal is the study of the controllability of some Partial Differential Equations.The first part of this thesis is concerned with the study of the controllability of some kinetic equations undergoing different regimes. Under a collisional regime, we study the controllability of the Kolmogorov equation, a particular case of kinetic Fokker-Planck equation, in the phase space $R^d times R^d$. We obtain the null-controllability of this equation thanks to the use of a spectral inequality associated to the Laplace operator in the whole space. Under a non-collisional regime, we study the controllability of two fluid-kinetic models, the Vlasov-Stokes system and the Vlasov-Navier-Stokes system, which exhibe nonlinearities due to the coupling terms. In those cases, the strategy relies on the Return method.In the second part, we study the controllability of a family of 1-D degenerate parabolic equations by the flatness method, which allows the construction of explicit controls.The third part is focused on the problem of the controllability of the Schrödinger equation via domain deformations, i.e., using the domain as a control. We obtain a result of this kind in the case of the two-dimensional unit disk, for radial data. Our methods are based on a local exact controllability result around a certain trajectory, obtained thanks to the Inverse Mapping theorem
Cluff, Stephen Roy. "Characterization and Modeling of the Martensite Transformation in Advanced High-Strength Steels". BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/9051.
Xiong, Wei. "Thermodynamic and Kinetic Investigation of the Fe-Cr-Ni System Driven by Engineering Applications". Doctoral thesis, KTH, Termodynamisk modellering, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-96707.
QC 20120612
Hero-m
Dussol, Damien. "Étude expérimentale et modélisation cinétique de la transformation d’éthanol en butadiène". Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1221/document.
Butadiene is a molecule of industrial interest that can be produced by the so-called Ostromislensky process, with ethanol as raw material. This study aims to develop a kinetic model to explain the transformation of an ethanol/acetaldehyde mixture into butadiene, as part of the second step of this process. The kinetic model is based on a reaction scheme and a reactor model. The proposed scheme includes the commonly accepted Gorin Jones pathway and a new pathway involving a butenone intermediate. The key steps were specifically studied via dedicated experiments. The scheme describes also steps leading to by products. It was validated from an experimental database, generated upstream of the study on a gas / solid type unit, fixed bed, isobaric (3 bara) and isothermal, with a Ta2O5 SiO2 catalyst. The influence of the operating conditions on the effluent was observed for three ethanol/acetaldehyde ratios and over ranges of PPH (1.1 to 8.1 g·gcata 1·h-1) and temperatures (320 to 370 °C). The reactor (plug flow without diffusional limitations) integrating kinetic laws of order, was modeled in the permanent state via a solver LSODE. Kinetic parameters were estimated via a Levenberg Marquardt optimizer from the experimental database. The kinetic model obtained, based on a brand new reaction scheme, is able to represent and predict the flow rates of the main compounds and the trends and orders of magnitude of the flow rates of the minority compounds according to the effects of PPH, charge and temperature, except under certain isolated operating conditions
Swarts, Andrew John. "Novel transition metal complexes based on N,N and N,P ligands as catalysts for ethylene transformation reactions". Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86330.
Santos, Alan Silva dos. "Transformation de composés modèles soufrés et oléfiniques représentatifs d'une essence de FCC. Approche expérimentale et théorique". Thesis, Poitiers, 2017. http://www.theses.fr/2017POIT2276/document.
A preferred route to reduce the sulfur content on the commercial gasoline is the selective hydrodesulfurization (HDS) process of FCC gasoline. A typical gasoline is composed by a mixture of sulfur (1000 ppm) and olefins (20-40%wt) compounds. Therefore, it is important to understand their transformation in order to improve the HDS and minimizing the olefin hydrogenation (HYD). Consequently, the transformation of various sulfur (2-methylthiophene, 3-methylthiophene and benzothiophene) and olefins (hex-1-ene, 4-methylpent-1-ene, 3,3-dimethylbut-1-ene and 2,3-dimethylbut-2-ene) has been studied under HDS operating conditions.By experimental and theoretical (kinetic modeling) approaches, a reactivity scale has been established between the sulfur compounds on one hand and olefins compounds on the other hand. The benzothiophene is the most reactive compound. However it is the most inhibitor compound for the transformation of others sulfur compounds. Regarding the olefins, the hex-1-ene is the most reactive compound among the others branched compounds. A mutual inhibition has been observed when those compounds are studied in mixture according with their structures. These effects result from competitive adsorption between the molecules on the catalyst surface. These results could be modeled and quantified (adsorption and kinetic constants) from a unique model considering the Langmuir-Hinshelwood formalism
Na, Dong-Yeop NA. "Electromagnetic Particle-in-Cell Algorithms on Unstructured Meshes for Kinetic Plasma Simulations". The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1543398838970791.
Liu, Rong. "Enzymes as catalysts in synthesis of enantiomerically pure building blocks : secondary alcohols bearing two vicinal stereocenters". Doctoral thesis, Stockholm : Chemical Science and Engineering, KTH, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-424.
Brownie, Barbara Kay. "The behaviours of fluid characterforms in temporal typography". Thesis, University of Hertfordshire, 2012. http://hdl.handle.net/2299/9037.
Feng, Zhiyao. "The Deformation-induced Martensitic Phase Transformation in Low Chromium Iron Nitrides at Cryogenic Temperatures". Case Western Reserve University School of Graduate Studies / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=case1526306156203016.
Monassier, Antoine [Verfasser], Fritz Elmar [Akademischer Betreuer] Kühn e Jean-Marie [Akademischer Betreuer] Basset. "Kinetic and mechanistic studies on the transformation of carbon dioxide by molecular catalysts / Antoine Monassier. Gutachter: Jean-Marie Basset ; Fritz Elmar Kühn. Betreuer: Fritz Elmar Kühn". München : Universitätsbibliothek der TU München, 2012. http://d-nb.info/1031550437/34.
Lu, Chang-Tsan. "Atomistic Study of Motion of Twin Boundaries: Nucleation, Initiation of Motion, and Steady Kinetics". Research Showcase @ CMU, 2013. http://repository.cmu.edu/dissertations/297.
Іваненко, Тетяна, e Михайло Опалєв. "Інноваційні шрифтові експерименти як засіб самовираження". Thesis, Київський національний університет технологій та дизайну, 2018. https://er.knutd.edu.ua/handle/123456789/10387.
The experimental techniques in the font design are considered as a socio-cultural phenomenon and reflection for the future. The results of the study are based on an example of professional font projects, as well asworks by designers and artists who do not specialize in typeface design. Techniques of transformation of the morphological structures of the accident font, as well as modern technical methods of execution of the author's plan, are considered.
Mercier, Géraldine. "Equipo 57. Un art expérimental collectif au service d’une transformation de la société, entre l’Espagne franquiste et l’Europe (1957-1966)". Thesis, Paris 4, 2017. http://www.theses.fr/2017PA040200.
In the 1950s, as Francisco Franco’s dictatorship tries to reintegrate its stifled country’s art scene onto the world stage by promoting certain Spanish abstract expressionists abroad, the position of Equipo 57, a collective of geometrical abstractionists, is unique. Eager to discover the free world, and thirsty for knowledge, the young artists Juan Serrano, José Duarte, Agustín Ibarrola and Ángel Duart meet in Paris in 1957. Sharing the same affinity for constructivist art and the Russian avant-garde, and united in their desire to renew Spanish cultural life, they decide to form a team of work and discussion. Upon their return to Cordoba, where they are joined by Juan Cuenca, the five members of the team elaborate a theory of the Interactivity of plastic space which guides their creation. The individuality of each member is thus erased for the good of the collective work. Aiming for an art that is able to enter into everyday life while questioning the responsibility of the artist, Equipo 57 uses a rational and objective language which takes form in painting, sculpture and design. They try to combine formal experiments as well as socio-political engagement. This premier monographic study in French aims to analyze the career of Equipo 57, from its inception in Paris in 1957 to its official dissolution in 1966. The group’s existence will be confronted with its sociocultural context in Franco’s Spain and Western Europe at the turn of the decade of the 1950s and 1960s
Wang, Bincheng. "Ultrahigh Density Magnetic Recording Media: Quantitative Kinetic Experiments and Models of the A1 to L10 Phase Transformation in FePt and Related Ternary Alloy Films". Research Showcase @ CMU, 2011. http://repository.cmu.edu/dissertations/72.
Svärd, Michael. "Structural, Kinetic and Thermodynamic Aspects of the Crystal Polymorphism of Substituted Monocyclic Aromatic Compounds". Doctoral thesis, KTH, Teknisk strömningslära, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-33836.
QC 20110527
Dupont, Anthony. "Cinétiques de transformations de produits pharmaceutiques sous broyage". Electronic Thesis or Diss., Université de Lille (2022-....), 2022. https://pepite-depot.univ-lille.fr/LIBRE/EDSMRE/2022/2022ULILR020.pdf.
The objective of this thesis is to improve the understanding of the fundamental microscopic mechanisms that govern the phase transformations induced directly in the solid state by mechanical milling. In particular, three key issues have been addressed: (i) We evaluated the influence of the milling temperature on the effective amorphization rate of a crystalline material. (ii) We determined the influence of monotropic and enantiotropic characters on the mechanisms of polymorphic transformations under milling. (iii) We have shown that the polymorphic transformations under milling are not direct but involve, on the contrary, a transient amorphization mechanism. Our strategy consisted in studying these different problems through a detailed analysis of the transformation kinetics which are the direct reflection of the physical mechanisms that govern them. For this purpose, we have studied in detail the transformation kinetics of physical states of several carefully chosen compounds. These include hydrochlorothiazide, sorbitol, glycine and their mixtures. The investigations were mainly carried out by X-ray diffraction and differential scanning calorimetry (DSC). Moreover, some experimentally demonstrated transformation mechanisms could be modelled and validated by numerical simulations. In summary, all our work indicates that, in general, the transformations under milling seem to result systematically from a competition between an amorphization mechanism due to mechanical shocks and a recrystallization mechanism whose nature depends on both the milling temperature and the crystalline specificities of the material
Kempen, Antoine. "Solid state phase transformation kinetics". [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=964251191.
Kempen, Antonius Theodorus Wilhelmus. "Solid state phase transformation kinetics". Stuttgart : Max-Planck-Institut für Metallforschung, 2001. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB9795832.
Garnier, Thomas. "Transfert d'échelle dans la modélisation thermodynamique et cinétique des alliages". Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00784326.
Sheikh, Kharisha S. "Kinetics of 2, 4, 6-Trinitrotoluene Reduction by Pseudomonas Putida". Ohio University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1156790187.
Mohapatra, Goutam. "Phase transformation kinetics the role of stress /". [S.l. : s.n.], 2006. http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-28837.
Lewis, Ryan D. "Everted Sanctuaries: Increments of Silence". Ohio University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1366374561.
Wu, Hsiu-Jean. "The kinetics of solvent-mediated phase transformations". Diss., The University of Arizona, 1990. http://hdl.handle.net/10150/184981.
Riehm, Derek J. "Kinetics of the pearlite to austenite reversion transformation". Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/29739.
Applied Science, Faculty of
Materials Engineering, Department of
Graduate
Gehringer, Paul. "Transformations: An Arts Center for Narrows, Virginia". Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/36253.
Master of Architecture
Bogár, Krisztián. "Synthetic transformations via metal- and enzyme-catalyzed dynamic kinetic resolution /". Stockholm : Department of Organic Chemistry, Stockholm University, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-6876.
Bauer, Rico [Verfasser]. "Solid-solid phase transformation kinetics / vorgelegt von Rico Bauer". Stuttgart : Max-Planck-Inst. für Metallforschung, 2010. http://d-nb.info/100971175X/34.
Jones, Stephen John. "Modelling inclusion potency and simultaneous transformation kinetics in steels". Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245152.
Bray, Helen Jane. "Kinetics of high-temperature transformations of clay minerals". Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249204.
Fan, Frank Yongzhen. "Kinetics of phase transformations in lithium-sulfur batteries". Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111247.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 139-150).
Sulfur is a promising positive electrode for lithium batteries with the potential to create the step-change improvement in energy density and cost needed for the widespread adoption of electric vehicles and renewable energy. However, lithium-sulfur batteries suffer from a number of challenges, among them poor rate capability resulting in part from a complex dissolution-precipitation mechanism which produces electronically insulating end members S₈ and Li₂S. Few studies have heretofore been performed on rate-limiting mechanisms in Li-S batteries, which must be elucidated in order to inform rational design of electrodes with high capacity and rate capability. Polysulfide solutions, intermediates in the electrochemical reduction of sulfur, are used for the first time to make an efficient, high energy density flow battery, enabled by a novel flow battery architecture using a percolating network of nanoscale conductive carbon. An extensive experimental study of exchange current density for redox of higher order polysulfide solutions and their ionic conductivity has been conducted. The type and amount of electrolyte solvent has been found to influence both of these. The second portion of this thesis characterizes the kinetics of Li₂S electrodeposition, which is responsible for three-quarters of the theoretical capacity of the sulfur cathode. Kinetics are found to be highly dependent on solvent choice in a manner similar to exchange current density. Furthermore, electrodeposition kinetics are found to slow considerably at the low electrolyte/sulfur ratios which are needed for high energy density and low cost. Materials such as conductive oxides can serve as nucleation promoters and help solve this challenge. The morphology of precipitates is found to be dependent on discharge rate, with large, discrete particles forming at low rates. A model was for describing 3-D electrodeposition of Li₂S under the influence of a soluble redox mediator which enables efficient utilization of conductive surface area and prevents passivation of conductive carbon with insulating Li₂S.
by Frank Yongzhen Fan.
Ph. D.
Alves, Margot. "Carbon dioxide and vegetable oil for the synthesis of bio-based polymer precursors". Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0129/document.
Although it is a thermodynamically and kinetically stable molecule, carbon dioxide can beconverted into five- and six-membered cyclic carbonates by coupling with epoxides or oxetanes, respectively, using appropriate catalysts. Cyclic carbonates are used as green solvents, electrolytes for Liion batteries or intermediates for the synthesis of polymers. However, the catalytic performance must be further enhanced in particular for the coupling of CO2 with epoxidized vegetable oils or oxetanes. In this context, we developed a new highly efficient bicomponent homogeneous organocatalyst composed of anammonium salt as the catalyst and fluorinated single or double hydrogen bond donors as co-catalysts. First,a screening of onium-based catalysts and hydrogen-bond donors was performed. Performances of thecatalysts and optimization of the reaction was realized through detailed kinetics studies using in-situ FTIR/Raman spectroscopy under pressure. We demonstrated that fluorinated alcohols showed unexpected co-catalytic activity due to synergisms between the onium salt and fluorinated co-catalysts enabling the fast and selective addition of CO2 on to model epoxides and epoxidized vegetable oils under solvent-free and mild experimental conditions. The use of this powerful dual catalyst was then extended to the first organocatalytic coupling of CO2 with less reactive oxetanes to produce hydroxyl telechelic oligocarbonates that were used asprecursor of CO2-based polyurethanes by chain-extension with a diisocyanate. In addition, a fine comprehension of the mechanisms was investigated by DFT calculations highlighting that the co-catalytic performance of the onium salt/fluorinated alcohol binary catalyst arose from the strong stabilization of the intermediates and transitions states by hydrogen-bonding. To date, through comparative studies, we evidenced that this new catalyst is one
Lihammar, Richard. "Enzyme- and Transition Metal-Catalyzed Asymmetric Transformations : Application of Enzymatic (D)KR in Enantioselective Synthesis". Doctoral thesis, Stockholms universitet, Institutionen för organisk kemi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-108351.
At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 3: Manuscript.
Leslie, Daniel C. "Transformation of UV-Filtering Agents in the Presence of Aqueous Chlorine: Kinetics and Transformation Products". University of Akron / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1306282546.
Kherrouba, Nabil. "Étude expérimentale et modélisation des cinétiques de transformation de phase dans un alliage de titane". Thesis, Lorient, 2017. http://www.theses.fr/2017LORIS449/document.
The aim of this thesis is to experimentally study and to model the kinetics of α + β → β → αII phase transformations in Ti-6Al-4V alloy for isothermal and non-isothermal conditions. To this purpose, several technics have been performed (DSC, SEM, optical microscopy, in-situ electrical resistivity and XRD). The KM-JMA equation has been used to describe the kinetics of phase transformations during isothermal holdings. An approach based on the additivity rule has been developed to adapt the KM-JMA equation to non-isothermal phase transformations and is compared to the one using the fictitious time. Kinetics parameters (n, k and Q) have been determined using this approach and discussed based on the microstructural analysis. Mechanisms of the α + β → β → α phase transformations have been discussed by considering the microstructural analysis and the kinetics parameters already determined. Finally, the βm → αII phase transformation kinetics in isothermal conditions has been simulated with the MatCalc software and modelled using both the nucleation – growth theory and the KM-JMA equation
CUNHA, CECILIO A. da. "Estudo da cinetica da transformacao de fase no estado solido UAL-3+AL-UAL-4". reponame:Repositório Institucional do IPEN, 1986. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9862.
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Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
Okutman, Tas Didem. "Microbial Reductive Transformation of Pentachloronitrobenzene". Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10520.
Baumann, Wolfgang [Verfasser]. "Phase-transformation kinetics of TiCr2 laves phases / vorgelegt von Wolfgang Baumann". Stuttgart : Max-Planck-Inst. für Metallforschung, 2010. http://d-nb.info/1007316489/34.
Mohapatra, Goutam [Verfasser]. "Phase transformation kinetics : the role of stress / vorgelegt von Goutam Mohapatra". Stuttgart : Max-Planck-Inst. für Metallforschung, 2006. http://d-nb.info/995372578/34.
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