Дисертації з теми "Coagulation and condensation structures"
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Щукіна, Людмила Павлівна, Георгій Вікторович Лісачук, Ярослав Олегович Галушка, Олена Юріївна Федоренко та Лариса Олександрівна Міхеєнко. "Технологічна цінність промислових хімічних добавок при їх використанні у виробництві будівельної кераміки". Thesis, Одеський національний політехнічний університет, 2013. http://repository.kpi.kharkov.ua/handle/KhPI-Press/31485.
Повний текст джерелаThe technological efficiency of complex surface-active additive "MasterCeram" using to improve the properties of ceramic masses and materials in the manufacture of wall ceramics is investigated. The water-reducing effect of the additive and its positive influence on the strength of the coagulation and condensation structure of ceramic masses are established. The optimal amount of additive, which recommended for use in the manufacture of terraced wall ceramic, are established.
Barakat, Mouhammad Abou-Al-Nasser. "Interaction rayonnement-particules : cas des fumées générées par differents types de combustibles." Poitiers, 1994. http://www.theses.fr/1994POIT2333.
Повний текст джерелаDevilliers, Marion. "Modélisation et simulation numérique de la dynamique des nanoparticules appliquée aux atmosphères libres et confinées." Phd thesis, Université Paris-Est, 2012. http://pastel.archives-ouvertes.fr/pastel-00779863.
Повний текст джерелаPalaniswaamy, Geethpriya. "DSMC multicomponent aerosol dynamics sampling algorithms and aerosol processes /." Diss., Columbia, Mo. : University of Missouri-Columbia, 2007. http://hdl.handle.net/10355/4737.
Повний текст джерелаThe entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed Dec. 12, 2007). Vita. Includes bibliographical references.
Brown, Anthony James Moginie. "Studies of the molecular structures of the blood coagulation fibrinolytic proteins." Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294268.
Повний текст джерелаKobayashi, Naoko. "Contributions to betalain biochemistry new structures, condensation reactions, and vacuolar transport /." [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=967151007.
Повний текст джерелаRivera, Mario A. "Seismic Response of Structures with Flexible Floor Slabs by a Dynamic Condensation Approach." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/29645.
Повний текст джерелаPh. D.
Andreev, Sergueï. "La condensation de Bose-Einstein des excitons indirects dans des nano-structures semi-conductrices." Thesis, Montpellier 2, 2014. http://www.theses.fr/2014MON20046.
Повний текст джерелаThe present Thesis is devoted to theoretical interpretation of intriguing observations made recently in cold gases of indirect excitons in semiconductor quantum wells. The proposed theory provides simple intuitive explanation for the basic phenomenology of the macroscopically ordered exciton state (MOES) and the localized bright spots (LBS) in the exciton photoluminescense pattern. The Thesis is organized as follows.First, we provide an important insight into the formation process of the external ring and LBS. We show that the macroscopic charge separation induced by the photoexcitation results in appearance of an in-plane electric field in the vicinity of the boundary. The field hybridizes 1s and 2p quantum states of an indirect exciton, effectively tilting its dipole moment. Thus polarized exciton seeks for the regions with higher in-plane electric field and, hence, becomes localized at the ring-shaped boundary.As a next step, we consider a gas of spinless dipolar bosons put in such two-dimensional (2D) traps. We analyze the possibility for occurence of Bose-Einstein condensation (BEC) in the system under consideration by means of the powerful many-body theoretical methods developed for ultracold atomic gases. Starting from the Hamiltonian for a segment of the ring (2D cigar) we show, howthe coherent scattering of excitons can result in autolocalization accompanied by a buildup of the diagonal long-range order. The crucial point of the theory then consists in replacement of the periodic coherent state by a chain of harmonically trapped condensates (Chain Model). We argue, that for sufficiently strong contact interaction between the excitons the system can exhibit the true second order phase transistion at finite temperature. The critical value of the interaction parameter can be found by analyzing the behaviour of the quantum phase fluctuations at zero temperature. The number of condensates at the ring in the strongly interacting regime is defined by the balance between the kinetic energy and the entropy terms in the free energy of the system.Futhermore, the use of the Chain Model of the MOES allows one to reveal scale invariance and universality of the pnenomenon. We obtain the expression for the unique critical temperature of the second order phase transition in the exciton system and discuss the effect of disorder.Finally, we comment on the role of many-body interactions and spin degrees of freedom in excitonic BEC. We suggest that each bead (or, equivalently, LBS) has the internal structure: it consists of a solid core (Quantum Exciton Iceberg) surrounded by a coherent exciton fluid. We develop an ideal gas model for the coherent four-component exciton fluid which allows one to explain the measured linear polarization patterns
Guigné, Claire de. "Réactions d'éthers de diénol pour l'accès à des structures terpéniques : condensation carbocationique et métallation vinylique." Rouen, 1997. http://www.theses.fr/1997ROUES034.
Повний текст джерелаCasanova, Euro. "Dynamique des structures cycliques avec incertitudes : modélisation modale des aubages de turbines." Compiègne, 2002. http://www.theses.fr/2002COMP1404.
Повний текст джерелаLi, Xiang-Yu. "Numerical approaches to droplet growth in atmospheric turbulence." Licentiate thesis, Stockholms universitet, Meteorologiska institutionen (MISU), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-129868.
Повний текст джерелаDurska, Magdalena. "Exciton polaritons in semiconductor microcavities : from polariton condensation in magnetic field to Bloch oscillations in modulated structures." Thesis, University of Sheffield, 2015. http://etheses.whiterose.ac.uk/9505/.
Повний текст джерелаFoucart, Brice. "Observation et modélisation de la Formation de Nouvelles Particules (FNP) au sein du panache volcanique du Piton de la Fournaise." Thesis, La Réunion, 2019. http://www.theses.fr/2019LARE0014/document.
Повний текст джерелаVolcanic activity can be a natural source of air pollution. This pollution can lead to a deterioration in air quality, affect human health and disrupt aviation safety. The Piton de la Fournaise in Reunion Island is one of the most active basaltic volcanoes in the world. Its sporadic eruptions generate volcanic plumes consisting mainly of gases and nanoparticles that spread in the atmosphere. During the day, a part of the sulphur dioxide can be oxidized to sulphuric acid thanks to oxidants production (photolysis). H2SO4molecules tend to react with atmospheric water molecules and form clusters via homogeneous binary nucleation. Then, these clusters grow by condensation and/or coagulation processes leading to the formation of a submicronic volcanic aerosol. This thesis aims to observe, understand and model the New Particle Formation (NPF) processes within volcanic plumes. Consequently, it is organized in two parts. The first is based on the data gathered during the multidisciplinary STRAP campaign conducted at both the Maïdo Observatory and Piton de la Fournaise volcano in 2015. It presents the results from a dual analysis of the NPF events frequency and intensity at the observatory. While the first analysis focuses on processes in the absence of the volcanic plume, the second highlights the specificities of the NPF related to the presence of the plume at Maïdo. The second part focuses on 0D then 3D NPF processes modelling within volcanic plumes via the Meso-NH atmospheric model
Pal, Aniruddha. "Experimental and Numerical Study of Dual-Chamber Thermosyphon." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/16251.
Повний текст джерелаPavlovic, Goran. "Exciton-polaritons in low dimensional structures." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2010. http://tel.archives-ouvertes.fr/tel-00632151.
Повний текст джерелаAlbriet, Bastien. "Modélisation numérique des aérosols à l'échelle locale." Phd thesis, Ecole des Ponts ParisTech, 2007. http://pastel.archives-ouvertes.fr/pastel-00002574.
Повний текст джерелаDamon, François. "Sonder des structures complexes avec des ondes de matière." Thesis, Toulouse 3, 2015. http://www.theses.fr/2015TOU30342/document.
Повний текст джерелаThis thesis presents the studies that I did at the Laboratoire de Physique Théorique. It concerns the interaction between matter waves and time and space depandant optical lattices. Using such lattices allows one to manipulate coherently the dynamical properties of ultra cold atoms. This theoretical study has been done in collaboration with the Cold Atoms group at the LCAR laboratory. The spatial variations of the lattice envelope locally create spatial gaps which create a Bragg cavity for matter waves. We have st udied in detail their properties and the cavity has been realized experimentally by using a Ru bid ium 85 Bose-Einstein condensate in a wave guide. We have also studied the propagation of an atomic cloud in a bichromatic optical lattice which allows us to make a quantum simulator of the Harper madel. The spectrum of the system Hamiltonian· posseses a fractal dimension which can be numerically characterized. We have also shawn that it is possible to use the repulsive interatomic interaction of a Bose-Einstein condensate in arder to amplify the momentum-position correlation during propagation in a guide. Our st udy shows that a mesure of local dynamical quantities of the atomic cloud enables one to experimentally probe resonances of an optical potential down to the picoKelvin scale. At last, an atomic cloud with attractive interactions admit a stable solution, the soliton. We have numerically demonstrated that this soliton can be used to probe bound states of a potential by populating those states through a scattering experiment, for example surface states
Odaymet, Ahmad. "Etude du transfert thermique local et identification des structures d'écoulement lors de la condensation dans un microcanal en silicium." Phd thesis, Université de Technologie de Belfort-Montbeliard, 2010. http://tel.archives-ouvertes.fr/tel-00711985.
Повний текст джерелаKaymak, Yalcin. "A Composite Frame/joint Super Element For Structures Strengthened By Externally Bonded Steel/frp Plates." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1052547/index.pdf.
Повний текст джерелаCorn, Stéphane. "Simplification de modèles éléments finis de structures à comportement dynamique de poutre." Phd thesis, Université de Franche-Comté, 1998. http://tel.archives-ouvertes.fr/tel-00625123.
Повний текст джерелаBendejacq, Denis. "Structures de copolymères diblocs amphiphiles." Paris 6, 2002. http://www.theses.fr/2002PA066392.
Повний текст джерелаMAYER, JUNG CLAUDINE. "Influence de la methylation sur la condensation et la variabilite structurale de l'adn : structures cristallines de quatre oligonucleotides natifs et methyles aux sites cpg." Université Louis Pasteur (Strasbourg) (1971-2008), 1997. http://www.theses.fr/1997STR13255.
Повний текст джерелаFlayac, Hugo. "Nouvelles tendances dans les condensats d'exciton-polaritons spineurs : défauts topologiques et structures de basse dimensionnalité." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2012. http://tel.archives-ouvertes.fr/tel-00822148.
Повний текст джерелаLlau, Antoine. "Méthodes de simulation du comportement mécanique non linéaire des grandes structures en béton armé et précontraint : condensation adaptative en contexte aléatoire et représentation des hétérogénéités." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAI029/document.
Повний текст джерелаLarge-scale concrete and reinforced concrete structures, and in particular containment buildings, may undergo localized cracking when they age or endure strong loadings (LOCA for instance). In order to optimize the maintenance actions, a predictive model of concrete damage is required. This phenomenon takes place at a rather small material scale and a predictive model requires a refined mesh and a nonlinear constitutive law. This type of modelling cannot be applied directly on a large-scale civil engineering structure, as the computational load would be too heavy for the existing machines.A simulation method is proposed to focus the computational effort on the areas of interest (damaged parts) of the structure while eliminating the undamaged areas. It aims at using the available computing power for the characterization of crack properties in particular. This approach uses Guyan’s static condensation technique to reduce the elastic areas to a set of boundary conditions applied to the areas of interest. When the system evolves, a set of criteria allows to promote on the fly the elastic areas to areas of interest if damage appears. This adaptive condensation technique allows to reduce the dimension of a nonlinear problem without degrading the quality of the results when compared to a full reference simulation.However, a classical modelling does not allow to take into account the various unknowns which will impact the structural behaviour: mechanical properties, geometry, loading… In order to better characterize this behaviour while taking into account the various uncertainties, the proposed adaptive condensation method is coupled with a stochastic collocation approach. Each deterministic simulation required for the characterization of the uncertainties on the structural quantities of interest is therefore reduced and the pre-processing steps necessary to the condensation technique are also reduced using a second collocation. The proposed approach allows to produce for a reduced computational cost the probability density functions of the quantities of interest of a large structure.The proposed calculation strategies give access at the local scale to a modelling finer than what would be applicable to the full structure. In order to improve the representativeness at this scale, the tridimensional effects of the heterogeneities must be taken into account. In the civil and nuclear engineering field, one of the main issues is the modelling of prestressing tendons, usually modelled in one dimension. A new approach is proposed, which uses a 1D mesh and model to build a volume equivalent to the tendon and redistribute the forces and stiffnesses in the concrete. It combines the representativeness of a full conform 3D modelling of the tendon when the mesh is refined and the ease of use of the 1D approaches.The applicability of the proposed methodologies to a large-scale civil engineering structure is evaluated using a numerical model of a 1/3 mock-up of a double-wall containment building of a PWR 1300 MWe nuclear reactor
Sarraf, Kifah. "Echangeurs à plaques corruguées en mode monophasique et en condensation : études expérimentale, numérique et analytique, et analyse des écoulements et des transferts thermiques." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4760/document.
Повний текст джерелаThis research work examines at the global and local scales the thermo-hydraulic characteristics of plate heat exchangers with corrugated chevron plates, for single-phase and condensation flows. The study is divided into two parts:The first part concerns the analysis of flow structures of single-phase flows using numerical simulations, which are validated using the results of the experimental campaign. The analysis of the simulations results, from a flow characteristic observable that has been carefully chosen, has allowed quantifying the main flow categories as a function of the heat exchanger geometric parameters and the flow characteristics. This new information on the flow structures has led to the proposal of an original generalized model of the friction law inside this type of heat exchanger with complex geometry.The second part concerns the study of condensation with and without vapor superheating at the inlet of the heat exchanger. Thus, a specific experimental setup allowing precise control of the boundary conditions has been developed. Otherwise a specific metrology, based on infrared thermography, has been set to the point in order to determine the variation of certain local quantities along the condenser (vapor mass fraction, heat transfer coefficient...). Thus, we observe a high and wide variability of the heat transfer coefficients and the heat flux density along the condenser, and the superheating of the vapor tends to increase the heat transfers. These additional measures question certain assumptions of the literature regarding the development of heat transfer correlations in plate heat condensers
Valente-Feliciano, Anne-Marie. "Development of SRF monolayer/multilayer thin film materials to increase the performance of SRF accelerating structures beyond bulk Nb." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112254/document.
Повний текст джерелаThe minimization of cost and energy consumption of future particle accelerators, both large and small, depends upon the development of new materials for the active surfaces of superconducting RF (SRF) accelerating structures. SRF properties are inherently a surface phenomenon as the RF only penetrates the London penetration depth λ, typically between 20 and 400 nm depending on the material. When other technological processes are optimized, the fundamental limit to the maximum supportable RF field amplitude is understood to be the field at which the magnetic flux first penetrates into the surface, Hc₁. Niobium, the material most exploited for SRF accelerator applications, has Hc₁~170 mT, which yields a maximum accelerating gradient of less than 50 MV/m. The greatest potential for dramatic new performance capabilities lies with methods and materials which deliberately produce the sub-micron-thick critical surface layer in a controlled way. In this context, two avenues are pursued for the use of SRF thin films as single layer superconductor or multilayer Superconductor-Insulator-Superconductor structures: Niobium on copper (Nb/Cu) technology for superconducting cavities has proven over the years to be a viable alternative to bulk niobium. However the deposition techniques used for cavities, mainly magnetron sputtering, have not yielded, so far, SRF surfaces suitable for high field performance. High quality films can be grown using methods of energetic condensation, such as Electron Cyclotron Resonance (ECR) Nb ion source in UHV which produce higher flux of ions with controllable incident angle and kinetic energy. The relationship between growth conditions, film microstructure and RF performance is studied. Nb films with unprecedented “bulk-like” properties are produced. The second approach is based on the proposition that a Superconductor/Insulator/Superconductor (S-I-S) multilayer film structure deposited on an Nb surface can achieve performance in excess of that of bulk Nb. Although, many higher-Tc superconducting compounds have Hc₁ lower than niobium, thin films of such compounds with a thickness (d) less than the penetration depth can exhibit an increase of the parallel Hc₁ thus delaying vortex entry. This overlayer provides magnetic screening of the underlying Nb which can then remain in the Meissner state at fields much higher than in bulk Nb. A proof of concept is developed based on NbTiN and AlN thin films. The growth of NbTiN and AlN films is studied and NbTiN-based multilayer structures deposited on Nb surfaces are characterized. The results from this work provide insight for the pursuit of major reductions in both capital and operating costs associated with future particle accelerators across the spectrum from low footprint compact machines to energy frontier facilities
Benros, Santos Lopes Silvania. "Integrated CFD Model for Nanoparticle Production in Inductively Coupled Plasma Reactor: Implementation and Application." Doctoral thesis, Universite Libre de Bruxelles, 2016. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/230486.
Повний текст джерелаDoctorat en Sciences de l'ingénieur et technologie
info:eu-repo/semantics/nonPublished
Jaumouillé, Vincent. "Dynamique des structures à interfaces non linéaires : Extension des techniques de balance harmonique." Phd thesis, Ecole Centrale de Lyon, 2011. http://tel.archives-ouvertes.fr/tel-00670283.
Повний текст джерелаLombard, Jean-Pierre. "Contribution à la réduction des modèles éléments finis par synthèse modale." Phd thesis, Université de Franche-Comté, 1999. http://tel.archives-ouvertes.fr/tel-00351693.
Повний текст джерелаUne nouvelle technique de synthèse modale est proposée: elle permet l'obtention de modèles réduits exempts de coordonnées de jonction. Ses performances sont comparées vis-à-vis des méthodes de sous-structuration classiques lors de la réduction de modèles de structures automobiles. Un modèle sous-structuré d'une caisse nue de véhicule de 450 000 ddl, présentant une forte connectivité, est condensé à 2000 ddl par cette méthode.
L'usage de transformations de coordonnées physiques avec la prise en compte des chargements appliqués est généralisé à l'ensemble des méthodes de réduction.
La robustesse des modèles réduits paramétrés est traitée ainsi que les techniques d'adaptation, par réductions multiplies, des données issues du modèle aux observations mesurées sur la structure dans des objectifs de recalage de modèle et d'optimisation de comportement.
Neirinck, Vincent. "Étude par RMN13C et 199Hg des états de condensation du noyau aromatique dans des structures lignines et dans leurs composés modèles : marquage au mercure de lignines d'extraction et de modèles monomères et polymères." Université Joseph Fourier (Grenoble ; 1971-2015), 1994. http://www.theses.fr/1994GRE10080.
Повний текст джерелаLack, Daniel Anthony. "Modelling the Formation of Atmospheric Aerosol From Gaseous Organic Precursors." Queensland University of Technology, 2003. http://eprints.qut.edu.au/15831/.
Повний текст джерелаHassan, Mohamed K. I. "Novel Elastomers, Characterization Techniques, and Improvements in the Mechanical Properties of Some Thermoplastic Biodegradable Polymers and Their Nanocomposites." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1086633832.
Повний текст джерелаDebry, Edouard. "Modélisation et simulation numérique de la dynamique des aérosols atmosphériques." Phd thesis, Ecole des Ponts ParisTech, 2004. http://pastel.archives-ouvertes.fr/pastel-00001030.
Повний текст джерелаКорнющенко, Ганна Сергіївна, Анна Сергеевна Корнющенко та Hanna Serhiivna Korniushchenko. "Структуроутворення і фізичні властивості близько- рівноважних металевих, оксидних та багатокомпонентних конденсатів з нанорозмірними елементами". Thesis, Сумський державний університет, 2021. https://essuir.sumdu.edu.ua/handle/123456789/86325.
Повний текст джерелаДиссертационная работа посвящена исследованию процессов фазо- и структурообразования близко-равновесных конденсатов отдельных металлов (Zn, Cu, Ni, Cr и Al), их оксидов (ZnO, NiO и CuO), фрактально-перколяционных наносистем (ZnO, ZnO/NiO и ZnO/ CuO), а также многоэлементных систем при наличии различных металлов (W, Ta, Нf, Ti, Mo, Сr, Zr, Al, Со и Ni) и углерода. Основным результатом работы является изучение трансформации селективных процессов фазообразования и пространственно распределенного роста конденсатов при осаждении пара в условиях приближения системы плазма–конденсат или химически активная среда–конденсат к термодинамическому равновесию и переходе от однокомпонентных систем к многокомпонентным. Установлено, что доминирующее влияние на процесс структурообразования наносистем оказывают сверхнизкие относительные пересыщения осаждаемого пара, а не тип активной среды над ростовой поверхностью. При этом значительная часть работы посвящена изучению процессов зарядопереноса в сенсорах фрактально-перколяционного типа на основе ZnO, ZnO/NiO и ZnO/CuO при воздействии на наносистемы газовыми реагентами и оптическим облучением, а также физическим свойствам многокомпонентных систем.
The dissertation is devoted to the investigation of the processes of phase and structure formation of near-equilibrium condensates of individual metals (Zn, Ni, Cu, Cr and Al), oxides (ZnO, NiO and CuO), fractal-percolation nanosystems (ZnO, ZnO/NiO and ZnO/CuO), as well as a multi-element systems composed of various metals (W, Ta, Hf, Ti, Mo, Cr, Zr, Al, Co and Ni) and carbon. The main result of the work is investigation of selective processes transformation at the phase formation and the condensates spatially distributed growth under vapor deposition conditions close to thermodynamic equilibrium in plasma-condensate and chemically active medium-condensate system in one component systems and during the transition from one-component to multicomponent systems. Mathematical model has been developed, that allows to estimate changes in the relative supersaturation of the depositing vapours in the range from 0.06 to 0.1 depending on the size of the zones of adatoms diffusion capture around Cu nanocrystals. With aim to compare the possibilities of the structure formation of near- equilibrium nanosystems using PVD and CVD technology, the technology of obtaining copper nanosystems based on the decomposition of CuCl2 in the presence of hydrogen and nitrogen have been proposed. It has been proved experimentally, that the dominant influence onto the nanosystems structure formation process plays ultralow relative saturation of the deposited vapour rather than the type of active medium above the growth surface. Based on fractal-percolation nanosystems ZnO, ZnO/CuO and ZnO/NiO selective gas sensors have been developed, that based on current-voltage characteristics shape allow to distinguish between different gaseous reagents. The analysis of changes in the shape of the I–V characteristics of fractal-percolation nanosystems ZnO, ZnO/CuO and ZnO/NiO have shown the fundamental possibility of recognizing such reagents in the air as CO2, C3H8 + C4H10 (LPG), CH3-C(O)-CH3, CH4 or C2H5OH. It has been shown, that during the transition to near-equilibrium condensation of a multicomponent layers, a growth surface with an increased density of active centres is formed. Therefore, adatoms attachment to the multicomponent growth surface occurs only provided the strongest chemical bonds are realized. This fact cause the high configurational entropy of mixing components, which in the presence of a carbon component is a prerequisite for the coatings formation with high micro-hardness characteristics.
Wootters, Adrienne Harding. "The nature of superfluid helium in porous structures." 2002. https://scholarworks.umass.edu/dissertations/AAI3056291.
Повний текст джерелаChen, Yun. "STM study of lead and bismuth structures on copper(001)." 1996. https://scholarworks.umass.edu/dissertations/AAI9619380.
Повний текст джерелаHuang, Elbert E. "Controlling polymer thin film structures by tuning interfacial interactions." 2000. https://scholarworks.umass.edu/dissertations/AAI9960760.
Повний текст джерелаChen, Zhi-Hwa, and 陳智華. "Blood coagulation on titanium surface with different crystal structures of titanium dioxide." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/10236199488421202948.
Повний текст джерела國立陽明大學
口腔生物研究所
97
When a titanium (Ti) implant is placed in human body, blood will be the first component to interact with implant surface, which an immediate blood coagulation process will be activated, helping the continued wound healing and tissue cell growth at the implant site, so one could say blood coagulation is an important first step for the early stage of osseointergration. But the mechanism of blood coagulation process activated by material surfaces is not entirely understood nowadays. Generally speaking as the intrinsic coagulation pathway will be activated by negatively charged Ti material surface, which a blood coagulation factor XII will first be contact-activated, then a chain of coagulation factors will be trigger and reacted, ultimately forming a bunch of fibrin mesh and binding with other activated platelets and red blood cells to form blood clots. However, the mechanism of how the physical, chemical and electrical properties of Ti implant surface effect the coagulation reaction still remains unclear. The aim of this study was to estimate the blood coagulation properties of two kinds of TiO2 crystal structure: anatase and rutile, which happen to have tremendous differences in their surface electrical properties, and by investigating the surface free energy and dielectric constant of both thin film surfaces, we may compare and evaluate the effect of surface electric properties to the hemocompatiblity of TiO2 films. The results show that, after PVD surface modification, although the surface free energy didn’t show obvious difference between anatase and rutile, but along with increase amount of rutile structure, the dielectric constant increased tremendously, as the activation of FXII, adsorption of fibrinogen, formation of fibrin network and adhesion of platelet, all show the same tendency.
Kobayashi, Naoko [Verfasser]. "Contributions to betalain biochemistry : new structures, condensation reactions, and vacuolar transport / von Naoko Kobayashi." 2002. http://d-nb.info/967151007/34.
Повний текст джерелаChen, Chun-han, and 陳軍翰. "Dynamic condensation, decomposition and optical properties of Cr2O3-dissolved TiO2 with rutile/post-rutile structures." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/25596878949137230866.
Повний текст джерелаDorfman, Konstantin E. "Modern problems in Statistical Physics of Bose-Einstein Condensation and in Electrodynamics of Free Electron Lasers." 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-533.
Повний текст джерелаTai, Ju-Ni, and 戴如妮. "Syntheses and Structures of Tungsten(0) Complexes of Tris(2-pyridylmethyl)amine and The Catalytic Applications to Biginelli Condensation Reactions." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/67203679673023153147.
Повний текст джерела國立中正大學
化學所
96
We have successfully synthesized the organotungsten Lewis acid, [N(CH2-2-py)3W(CO)(NO)2](BF4)2 (3) in quantitative yield by treating W(CH3CN)3(CO)3 with N(CH2-2-py)3 (tpa) in the presence of 2 equiv. of NOBF4 in CH3CN at 0 oC for 90 minutes. The complex 3 is very moisture- and air-stable. Its crystalline solid form can be stored in air for months and its solution can also stay unchanged for at least 48 hours without detectable decomposition. In addition, complex 3 has a relatively high water-solubility of 37 g/L and possesses strong Lewis acidity upon loss of the CO ligand. The Lewis acidity of [N(CH2-2-py)3W(CO)(NO)2]2+ measured by 1H NMR method falls between those found for AlCl3 and BF3. But the complex [N(CH2-2-py)3W(CO)(NO)2]2+ exhibits very different structures in solid state and in solution. The crystal structure of 3 shows the tpa ligand in its h4-coordination mode bound to the W center. While in solution state, tpa has various coordination possibilities (h3- or h4-interconversion) as suggested by its 1H NMR spectral data. Because the lability of CO ligand, the resulting 16-e species (the real active catalyst) could be further stabilized by the formation of the 4th W-N bonding via a fast h3-to-h4 interconversion. The three-component Biginelli condensation reaction is one of the most widely applied method for the synthesis of 3,4-dihydropyridine-2(1H)-one (DHPMs). This one pot reaction involves the condensation of ethyl acetoacete, aldehyde and urea in the presence of a variety of acidic condensing agents. In this dissertation a series of Biginelli condensation reactions were catalyzed by a novel organotungten Lewis acid [N(CH2-2-py)3W(CO)(NO)2](BF4)2 (3). With the employment of as little as 0.6 mol% of catalyst 3, the condensation reactions were efficiently proceeded in molecular solvent systems such as DMF or in a thermally stable room temperature ionic liquid, BmimPF6 (1-butyl-3-methylimidazolium hexafluorophosphate). We have also investigated the congregating effect of this Lewis acid under microwave irradiation conditions. In all cases, a dramatic reaction rate-enhancement from hours to minutes was observed under microwave irradiation conditions as compared to those found by using thermal heating method. In addition, it has been demonstrated that catalyst 3 can be selective and as effective towards organic base functionality.