Teses / dissertações sobre o tema "Chamba Masks"
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Sanchez, Erin. "Filtration Efficiency of Surgical Masks". Scholar Commons, 2010. https://scholarcommons.usf.edu/etd/1760.
Texto completo da fonteOzimek, Constance. "Mass Cycling through Crustal Magma Chambers and the Influence of Thermo-Mechanical State on Magma Compositions through Time". Thesis, University of Oregon, 2018. http://hdl.handle.net/1794/23153.
Texto completo da fonteThomas, Zachariah. "Seeing a Tree for the Forest". Bowling Green State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1554911121221355.
Texto completo da fonteGuénaut, Céline. "Optimized ion trapping of exotic nuclides for mass measurements in the N=40 (magic?) region". Paris 11, 2005. http://www.theses.fr/2005PA112073.
Texto completo da fonteMagic numbers or shell closures, are an important feature of nuclear structure, but now found to be modified far from stability. Determination of the nuclear binding energy via mass measurements of exotic nuclides represents one of the greatest challenges in the study of nuclear structure due to the high precision required and the low production rates and short half-lives. To solve the problem, the complementary spectrometers MISTRALand ISOLTRAP may be used, both located at ISOLDE/CERN (Geneva). MISTRAL is a transmission mass spectrometer for very short-lived nuclides, and ISOLTRAP a Penningtrap mass spectrometer providing exceptional precision. This thesis describes improvements in the limitations of these complementary instruments: a beam cooler to increase the sensitivity of MISTRAL and an optimization procedure to improve the definition ofthe ISOLTRAP trapping fields. High-precision mass measurements were performed at ISOLTRAP to extend the backbone of well-known nuclides in the mass table, and to finely examine the case for new magic numbers N = 32 and 40. The results illustrate a subtle effect of extra binding energy for 56Cr32 in the presence of a probable deformation. Practically no additional binding is found for 68Ni40 though a small effect is visible, perhaps in conjunction with a competitive mid-shell effect at N = 39
Erupe, Mark E. "Sources and Source Processes of Organic Nitrogen Aerosols in the Atmosphere". DigitalCommons@USU, 2008. https://digitalcommons.usu.edu/etd/196.
Texto completo da fonteHudjetz, Stefan. "Experimental investigation of heat exchange between thermal mass and room environments". Thesis, De Montfort University, 2012. http://hdl.handle.net/2086/9021.
Texto completo da fonteOsuagwu, Chiemeriwo Godday. "Investigation of volatile organic compounds from diesel engine emissions using H3O+ chemical ionisation mass spectrometry (H3O+-CIMS)". Thesis, Queensland University of Technology, 2020. https://eprints.qut.edu.au/205507/1/Chiemeriwo_Osuagwu_Thesis.pdf.
Texto completo da fonteHudson, Neale Alan. "Investigation of mechanisms governing emission of odorants". Thesis, Queensland University of Technology, 2009. https://eprints.qut.edu.au/32001/1/Neale_Hudson_Thesis.pdf.
Texto completo da fonteLamkaddam, Houssni. "Etude en atmosphère simulée de la formation d'Aérosol Organique Secondaire issue de la photooxydation du n-dodécane : impact des paramètres environnementaux". Thesis, Paris Est, 2017. http://www.theses.fr/2017PESC1128/document.
Texto completo da fonteSecondary Organic Aerosol (SOA), the major fraction of the submicron aerosol, plays a key role on health, environment and climate. The evaluation of its impacts is a real challenge for the scientific community. Our current knowledge of SOA formation processes and chemical composition is still very deficient and limit the development of atmospheric models to quantify the impacts of SOA on air quality and climate system. Therefore, the aim of this work is to produce a set of experimental data to use to constrain and improve the models. To do that, the SOA formation has been studied from the photooxidation of a model precursor, n-dodecane, in the CESAM environmental chamber. The chemical composition has been investigated by spectrometric and chromatographic techniques which allowed us to identify the reaction products constituting the gaseous and particulate phases. In particular, new condensed phase mechanisms have been proposed to explain the formation of carboxylic acids and lactones, identified for the first time. These could be implemented in the models. A wide variety of environmental conditions, such as temperature, relative humidity and the presence/absence of preexisting particles, have been taken into account in this work. The study of the temperature influence has shown a low sensitivity of this parameter on the SOA production. While the study relative humidity effect has shown that adding water to the reaction system beyond 5% lowers SOA yields by almost a factor of 2 in comparison to dry conditions. The SOA formation potential, under these conditions, has been evaluated, and resulted in parameterizations which could be useful for modelers. Furthermore, a characterization of the wall effects in CESAM, i.e. gas and particulate phase wall losses, has been carried out
Shirsat, Abhijeet R. "Understanding the Allure and Danger of Fake News in Social Media Environments". Bowling Green State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1530280814598288.
Texto completo da fonteJolleys, Matthew. "A global analysis of biomass burning organic aerosol". Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/a-global-analysis-of-biomass-burning-organic-aerosol(6dbebe3d-fb4a-4d68-b6c7-83c32ae3fa52).html.
Texto completo da fonteSchmitt, Romain. "S-nitrosoglutathion et perméabilité intestinale : de la mise en place d’un modèle de chambre de Ussing à l’étude de l’impact de ce donneur de monoxyde d’azote sur la barrière intestinale Involved factors in the maintenance of intestinal barrier homeostasis: a review How to guarantee results from ex vivo studies based on Ussing chamber system for studying intestinal barrier integrity and function Comparison between two derivatization methods of nitrite ion labeled with 15N applied to liquid chromatography-tandem mass spectrometry Influence of S-nitrosoglutathione metabolism on its intestinal permeability Luminal S-nitrosoglutathione effects on intestinal barrier in an ex vivo model of Ussing chamber". Thesis, Université de Lorraine, 2019. http://www.theses.fr/2019LORR0342.
Texto completo da fonteNitric oxide is known for its many actions to maintain intestinal barrier homeostasis, regulating mucus secretion, oxidative stress, immune system… S-nitrosoglutathione (GSNO), a nitric oxide donor naturally produced by the organism, has shown a beneficial effect on the intestinal barrier reinforcement. Nowadays, challenge is to understand the mechanisms inherent to this observation. For that, a Ussing chamber study was performed. After the model validation, by following permeability markers, histological studies, and cell junction proteins expression study, the GSNO metabolism administered in the intestinal lumen was explored. Also, GSNO effect on the intestinal barrier permeability was evaluated. Results allow today to consider GSNO as an interesting and promising drug candidate, in the context of intestinal, cardiovascular or cerebral pathologies
Mahnic̆-Kalamiza, Samo. "Effects of electrical and thermal pre-treatment on mass transport in biological tissue". Thesis, Compiègne, 2015. http://www.theses.fr/2015COMP2247/document.
Texto completo da fonteAn electric field of sufficient strength can cause an increase of conductivity and permeability of cell membrane. Effect is known as electroporation and is attributed to creation of aqueous pathways in the membrane. Quantifying mass transport in connection with electroporation of biological tissues is an important goal. The ability to fully comprehend transport processes has ramifications in improved juice extraction and improved selective extraction of compounds from plant cells, improved drug delivery, and solutions to environmental challenges. While electroporation is intensively investigated, there is a lack of models that can be used to model mass transport in complex structures such as biological tissues with relation to electroporation. This thesis presents an attempt at constructing a theoretical mathematical description – a model, for studying mass (and heat) transfer in electroporated tissue. The model was developed employing conservation and transport laws and enables coupling effects of electroporation to the membrane of individual cells with the resulting mass transport or heat transfer in tissue. An analytical solution has been found though the model can be extended with additional dependencies to account for the phenomenon of electroporation, and solved numerically. Thesis comprises five peer-reviewed papers describing electroporation in the food industry, model creation for the problem of diffusion, translation of the model to the mathematically-related case of juice expression, model validation, as well as suggestions for possible future development, extension, and generalization. An additional chapter is dedicated to transfer of heat in tissue
Zimmer, Leonardo. "Numerical study of soot formation in laminar ethylene diffusion flames". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/150754.
Texto completo da fonteThe objective of this thesis is to study soot formation in laminar diffusion flames. For soot modeling, a semi-empirical two equation model is chosen for predicting soot mass fraction and number density. The model describes particle nucleation, surface growth and oxidation. For flame radiation, the radiant heat losses (gas and soot) is modelled by using the grey-gas approximation with Optically Thin Approximation (OTA). Different transport models (detailed or simplified) are evaluated. For the chemical kinetics, detailed and reduced approaches are employed. In the present work, the automatic reduction technique known as Flamelet Generated Manifold (FGM) is being explored. This reduction technique is able to deal with detailed kinetic mechanisms with reduced computational times. To assess the soot formation a variety of numerical experiments were done, from one-dimensional ethylene counterflow adiabatic flames to two-dimensional coflow ethylene flames with heat loss. In order to assess modeling limitations the mass and energy coupling between soot solid particles and gas-phase species are investigated and quantified for counterflow flames. It is found that the gas and soot radiation terms are of primary importance for flame simulations. The additional coupling terms (mass and thermodynamic properties) are generally a second order effect, but their importance increase as the soot amount increases As a general recommendation the full coupling should be taken into account only when the soot mass fraction, YS, is equal to or larger than 0.008. Then the simulation of soot is applied to two-dimensional ethylene co-flow flames with detailed chemical kinetics and explores the effect of different transport models on soot predictions. It is found that the gas and soot radiation terms are also of primary importance for flame simulations and that a first attempt to solve the two-dimensional ethylene co-flow flame can be done using a simplified transport model. Finally an implementation of the soot model with the FGM reduction technique is done and different forms for storing soot information in the manifold is explored. The best option tested in this work is to solve all flamelets with soot and gas-phase species in a coupled manner, and to store the soot rates in terms of specific surface area in the manifold. In the two-dimensional simulations, these soot rates are then retrieved to solve the additional equations for soot modeling. The results showed a good qualitative agreement between FGM solution and the detailed solution, but the high amount of soot in the system still imposes some challenges to obtain good quantitative results. Nevertheless, it was demonstrated the great potential of the method for predicting soot formation in multidimensional ethylene diffusion flames with reduced computational time.
Escobar, Gil de Montes María Teresa. "Estudio comparativo de la velocidad y calidad de inducción y recuperación anestésica con isofluorano y sevofluorano en gatos premedicados". Doctoral thesis, Universidad de Murcia, 2011. http://hdl.handle.net/10803/31865.
Texto completo da fonteLeather, Kimberley. "Tropospheric ozone and photochemical processing of hydrocarbons : laboratory based kinetic and product studies". Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/tropospheric-ozone-and-photochemical-processing-of-hydrocarbons-laboratory-based-kinetic-and-product-studies(39b76a99-2358-4db2-be58-baa75d18efea).html.
Texto completo da fonteHusseini, Hassan Al. "Adaptation de la méthode de corrélation d'images numériques pour la gestion des discontinuités du milieu et de la transformation". Thesis, Poitiers, 2014. http://www.theses.fr/2014POIT2270/document.
Texto completo da fonteThe development of the digital image correlation method (DIC) for the management of discontinuities of the material and the transformation is discussed in this thesis. As we know, the framework for the use of the optical measurement methods i.e. of continuum mechanics requires a continuity of: i) domain and ii) transformation. To treat those discontinuities, we can consider a piecewise continuity (material and transformation). In the case of DIC method, this can be done by adapting locally the shape and size of the correlation subsets to the zone of interest and its kinematics. A novel way to do it, is by using masks: an object mask to process material discontinuities and a discontinuity mask to process transformation discontinuities. However before the implementation of masks in the correlation process, several experimental displacement tests on models reproducing the two types of discontinuity at small scale were performed. Those tests proved the influence of discontinuities on the degradation of the measurement accuracy by DIC. Then, tensile tests were conducted on a polycarbonate made specimen knowing a mode I opening or closing crack. After implementing masks in the correlation software Correla, the calculation of displacement and deformation fields was successfully performed on the surface of this specimen for all its edges, demonstrating the effectiveness of the adapted DIC
Macy, Dylan V. "Climate Translators: Broadcast New's Contribution to the Political Divide over Climate Change in the United States". Scholarship @ Claremont, 2020. https://scholarship.claremont.edu/pitzer_theses/94.
Texto completo da fonteAzzouz, Ali. "Conception d'un thermoanemometre et application a l'evaluation des transferts thermiques lors de l'ouverture d'une chambre froide industrielle". Paris, CNAM, 1988. http://www.theses.fr/1988CNAM0096.
Texto completo da fonteEscudie, Antony. "From the observation of UHECR signal in [1-200] MHz to the composition with the CODALEMA and EXTASIS experiments". Thesis, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2019. http://www.theses.fr/2019IMTA0145/document.
Texto completo da fonteDespite the discovery of cosmic rays there are more than one hundred years ago, many questions remain unanswered today: what are cosmic rays, how are they created and where do they come from ? Since 2002, the CODALEMA instrument, located within the Nançay Radio Observatory, studies the ultra-high energy cosmic rays (UHECR, above 1017 eV) arriving in the Earth atmosphere. Their low flux makes it impossible to detect them directly at these energies. These cosmic rays, however, will interact with the atoms of the atmosphere, generating a cascade of secondary charged particles, commonly known as extensive air shower (EAS), detectable at ground level, and from which we will extract information on the primary cosmic ray. The objective is to go back to the characteristics of the primary that generated the EAS, thus to determine its direction of arrival, its nature and its energy. During the development of the shower, these charged particles in movement generate a fast electric field transient, detected at ground by CODALEMA with dedicated radio antennas over a wide frequency band (between 1 and 200 MHz). The major advantage of radio-detection is its sensibility to the whole profile of the shower and its duty cycle close to 100 %, which could increase the number of events detected at very high energy, and thus to better constrain the properties of the RCUHE. Over the years, significant efforts have been devoted to the understanding of the radio emission of extensive air shower (EAS) in the range [20-80] MHz but, despite some studies led until the nineties, the[1-10] MHz band has remained unused for nearly 30 years. One of the contributions of this thesis concerns the EXTASIS experiment, supported by the CODALEMA instrument, which aims to reinvestigate the [1-10] MHz band and to study the so-called ”sudden death” contribution, which is the expected impulsive electric field created by the particles at their arrival and their disappearance on the ground. We present the instrumental set up of EXTASIS, composed of 7 low frequency antennas exploited in [1.7-3.7] MHz, covering approximately 1 km2. We report the observation, over 2 years, of 25 low-frequency events detected in coincidence by CODALEMA and EXTASIS and estimate a detection limit of 23±4 μV/m from comparisons with simulations. We also report a strong correlation between the observation of the low frequency signal and the atmospheric electric field. The other major contribution of this thesis concerns the study of the electric field emitted by the EAS and the improvement of the detector’s performances in the [20-200] MHz band. First, we propose a calibration method for CODALEMA antennas using the radio emission of the Galaxy. We are also investigating several noise rejection algorithms to improve the selectivity of recorded events. We then present a method for reconstructing the parameters of the primary cosmic ray, implementing systematic comparisons combing polarization and frequency information between the recorded data and simulations, leading finally to a proposal for a mass composition of cosmic rays detected
Gallet, Florian. "Modélisation de l'évolution du moment cinétique des étoiles de faible masse". Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENY055/document.
Texto completo da fonteIn 1972, Skumanich discovers a unique empirical relationship between the rotation period of the surface of G star and their age on the main sequence. This discovery then opened a new path for stellar dating: the gyrochronology. Therefore, many authors in the late 80's and the begenning 90's, were interested in the evolution of the surface angular velocity of low-mass stars ($M_*$ = 0.4 $M_{odot}$- 1.1 $M_{odot}$). The first phenomenological models on the subject were born.The angular velocity evolution of these stars begins to be reasonably well reproduced by the class of parametrical model that I present in this thesis. Because of the lack of adequate theoretical descriptions, only the overall effects of the physical mechanisms involved are described here. The main issue is to study the framework and how the stellar angular momentum is affected by these processes and to constrain their main characteristics.Over the course of my thesis, I modelled the rotational tracks of external and median envelopes and median of rotation period distributions of 18 stellar clusters between 1 Myr and 1 Gyr. This allowed me to analyse the time dependence of the physical mechanisms involved in the angular momentum evolution of solar-type stars. The results I obtained show that the evolution of the internal differential rotation significantly impact the rotational convergence (empirical Skumanich's relationship), the evolution of the surface lithium abundance, and the intensity of the magnetic field generated by dynamo effect. In addition to the reproduction of these external envelopes, the model I developed provides constraints on the mechanisms of internal redistribution of angular momentum and the lifetimes of circumstellar disks, that are held responsible for the rotational regulation observed during the first few million years of pre-main sequence. The extension of the model to less massive stars (0.5 et 0.8 $M_{odot}$) that I performed also provided the mass dependence of these physical processes. Most specifically, this step added strong constraints on the characteristic time associated to the transport of angular momentum between the core and the envelope, on the efficiency of magnetic braking likely related to a change of topology from solar-type stars to those of 0.5 $M_{odot}$, and on the internal and external rotational history of stars from 1 Myr to 1 Gyr
Roussey, Claire. "Étude multi-échelle des transferts couplés de liquide et d’oxygène à travers la barrique en chêne et les douelles". Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPAST037.
Texto completo da fonteThe aging of wines and spirits in oak barrels modifies their organoleptic qualities by two main phenomena. Firstly, the wood releases volatile and non-volatile compounds that enrich the beverage, and secondly, the wood properties allow a slight oxidation throughout the aging process. In the latter case, the modes of oxygen transfer as well as the limiting factors are little known today, although they are of great importance in the quality of the final product. This thesis aims to provide a better understanding of the dynamics of oxygen transfer in oak, in the presence of the liquid impregnation front due to the contact between the liquid and the internal surface of the barrel. To this end, several original experimental set-ups have been developed.Initially, at the barrel scale, 4 instrumented barrels were placed in a cellar to study the transfers in real conditions. The loss of liquid during aging generates an internal underpressure. Thus, in addition to the diffusion of oxygen through the wood thickness, there is a phenomenon of air percolation towards the inside of the barrel from a certain threshold of the pressure gap. This percolation threshold can be reached during variations in relative humidity and temperature conditions in the cellar, which provoke dimensional changes of the barrel. Oxygen inputs between 10 and 100 µg/L per percolation event are observed. These contributions are not negligible compared to the quantity of oxygen that the wine receives during its aging.Secondly, at the stave scale, each mechanism is treated in a decoupled way: diffusion of oxygen on the one hand and monitoring of the imbibition front on the other. Oxygen diffusion is studied for sessile oak (Quercus petraea (Matt.) Liebl.) and pedunculate oak (Quercus robur L.) with various ring widths using an innovative experimental device. A numerical model based on the finite volume method is used to identify the diffusion coefficient. A good representation of the diffusion via simulation is observed. Next, the imbibition front is monitored by an X-ray imaging system on stave samples in contact with water and ethanol. An unsupervised image correlation algorithm is developed to monitor the progress of the liquid front over several months.Finally, the study of simultaneous transfers is carried out by combining the last two experiments. A strong decrease in oxygen diffusion is then observed with the advance of the imbibition front in the stave thickness. These results allowed us to better apprehend the complexity of the dynamics of oxygen transfer during the aging of wines and spirits in oak barrels
Todorova-Nova, Sharka. "Mesure de la masse des bosons w# au lep a l'aide du detecteur delphi". Strasbourg 1, 1998. http://www.theses.fr/1998STR13108.
Texto completo da fonteVölkel, Norbert. "Design and characterization of gas-liquid microreactors". Thesis, Toulouse, INPT, 2009. http://www.theses.fr/2009INPT020G/document.
Texto completo da fonteThe present project deals with the improvement of the design of gas-liquid microreactors. The term microreactor characterizes devices composed of channels that have dimensions in the several tens to several hundreds of microns. Due to their increased surface to volume ratios these devices are a promising way to control fast and highly exothermic reactions, often employed in the production of fine chemicals and pharmaceutical compounds. In the case of gas-liquid systems, these are for example direct fluorination, hydrogenation or oxidation reactions. Compared to conventional equipment microreactors offer the possibility to suppress hot spots and to operate hazardous reaction systems at increased reactant concentrations. Thereby selectivity may be increased and operating costs decreased. In this manner microreaction technology well fits in the challenges the chemical industry is continuously confronted to, which are amongst others the reduction of energy consumption and better feedstock utilization. The main topics which have to be considered with respect to the design of gasliquid μ-reactors are heat and mass transfer. In two phase systems both are strongly influenced by the nature of the flow and thus hydrodynamics play a central role. Consequently we focused our work on the hydrodynamics of the two-phase flow in microchannels and the description of the inter-linkage to gas-liquid mass transfer. In this context we were initially concerned with the topic of gas-liquid flow regimes and the main parameters prescribing flow pattern transitions. From a comparison of flow patterns with respect to their mass transfer capacity, as well as the flexibility offered with respect to operating conditions, the Taylor flow pattern appears to be the most promising flow characteristic for performing fast, highly exothermic and mass transfer limited reactions. This flow pattern is characterized by elongated bubbles surrounded by a liquid film and separated from each other by liquid slugs. In addition to the fact that this flow regime is accessible within a large range of gas and liquid flow rates, and has a relatively high specific interfacial area, Taylor flow features a recirculation motion within the liquid slugs, which is generally assumed to increase molecular transport between the gas-liquid interface and the bulk of the liquid phase. From a closer look on the local hydrodynamics of Taylor flow, including the fundamentals of bubble transport and the description of the recirculation flow within the liquid phase, it turned out that two-phase pressure drop and gas-liquid mass transfer are governed by the bubble velocity, bubble lengths and slug lengths. In the following step we have dealt with the prediction of these key hydrodynamic parameters. In this connection the first part of our experimental study was concerned with the investigation of the formation of bubbles and slugs and the characterization of the liquid phase velocity field in microchannels of rectangular cross-section. In addition we also addressed the phenomenon of film dewetting, which plays an important rôle concerning pressure drop and mass-transfer in Taylor flow. In the second part we focused on the prediction of gas-liquid mass transfer in Taylor flow. Measurements of the volumetric liquid side mass transfer coefficient (kLa-value) were conducted and the related two-phase flow was recorded. The measured bubble velocities, bubble lengths and slug lengths, as well as the findings previously obtained from the characterization of the velocity field were used to set-up a modified model for the prediction of kLa-values in μ-channels of rectangular cross-section. Describing the interaction of channel design hydrodynamics and mass transfer our work thus provides an important contribution towards the control of the operation of fast, highly exothermic and mass transfer limited gas-liquid reactions in microchannels. In addition it enabled us to identify gaps of knowledge, whose investigation should be items of further research
Safeea, Mohammad. "Des robots manipulateurs collaboratifs sûrs". Thesis, Paris, HESAM, 2020. http://www.theses.fr/2020HESAE036.
Texto completo da fonteCollaborative industrial manipulators are ushering a new era in flexible manufacturing, where robots and humans are allowed to coexist and work side by side. However, various challenges still persist in achieving full human robot collaboration on the factory floor. In this thesis two main challenges - safety and collaboration - for achieving that goal are addressed. On safety, the thesis presents a real-time collision avoidance method which allows the robot to adjust the offline generated paths of the industrial task in real-time for avoiding collisions with humans nearby. In addition, the thesis presented a new method for performing the reactive collision avoidance motion using second order Newton method which offers various advantages over the traditional methods in the literature. On collaboration, the thesis presents the precision hand-guiding as an alternative to the teach-pendant for performing precise positioning operations of the robot’s end-effector in a simple and intuitive manner. The thesis also presents new contributions into the mathematical formulation of robot dynamics, including a recursive algorithm for calculating the mass matrix of serially linked robots with a minimal second order cost, and a recursive algorithm for calculating Christoffel symbols efficiently. All the presented algorithms are validated either in simulation or in a real-world scenario
Arnoud, Yannick. "Mesure de la masse du meson bs par la reconstruction de ses modes de desintegration exclusifs a l'aide du detecteur delphi". Paris 11, 1995. http://www.theses.fr/1995PA112177.
Texto completo da fonteKerdi, Banan Khaled. "Transport quantique des trous dans une monocouche de WSe2 sous champ magnétique intense". Thesis, Toulouse 3, 2021. http://www.theses.fr/2021TOU30009.
Texto completo da fonteTransition metal dichalcogenides are made up of a stack of atomic monolayers bound together by weak Van der Waals interactions. When a single layer of this material is isolated, the crystal inversion symmetry is broken, leading to the degeneracy lifting of the electronic states having different spins in the presence of strong spin-orbit coupling. The effective Landé factor (g*) which arises in the Zeeman energy is a parameter which characterizes, among others, the band-structure of the material. It is exceptionally large in WSe_2 monolayers thanks to the presence of heavy tungsten atoms as well as electronic interactions. Its experimental determination through electrical resistance measurements under intense magnetic field constitutes the objective of this thesis. First, WSe_2 monolayers are produced by mechanical exfoliation of the mother material and their electrical addressing at the micrometric scale is achieved by clean room processes involving electron-beam lithography. Their magneto-resistance is studied under extreme conditions of low temperature and high magnetic field. The charge carrier density, holes in the thesis, can be varied in situ thanks to field effect. In WSe_2 monolayers, the quantization of the Landau level energy modified by the Zeeman effect is revealed by the presence of complex magneto-resistance oscillations (Shubnikov-de Haas oscillations). A dedicated theoretical model, where disorder is introduced through a Gaussian broadening of the Landau levels, is necessary for a quantitative understanding of the experimental results. The components of the resistivity tensor are simulated by this model where the main fitting parameters are the electronic mobility, the mobility edge of the Landau levels and the effective Landé factor. The fitting of the experimental results allows the extraction of g* for a hole density ranging from 5.10^12 to 7.5.10^12 cm^-2, which follows the trend reported in the literature. Beyond the innovative approaches in terms of experimental conditions and modelling, this study confirms the importance of electronic interactions in understanding the electronic properties of this material
Garcia, Fernandez Carlos. "Modeling Optical Properties of Combustion Soot emitted in the Troposphere". Thesis, Besançon, 2015. http://www.theses.fr/2015BESA2040/document.
Texto completo da fonteThis work concerns the modeling, at the molecular level, of the interaction between carbonaceous particles of nanometric size and the electromagnetic radiation. The goal is to improve our understanding of the optical properties of soot particles, to better quantify the influence of soot on the atmosphere and on climate change. The study of the interaction between radiation and fresh soot particles was carried out using the point dipole interaction method; it has been shown that: i) the mass absorption coefficient (MAC) of these soot nanoparticles may significantly depend on their atomistic details, especially between 200 and 350 nm; ii) the MAC depends on whether the heart of the carbonaceous particle is occupied or not by graphite planes; iii) an analytical model is not suitable for calculating the MAC of carbonaceous nanoparticles having structural defects. In addition, quantum chemical methods have been used to characterize the ageing of soot. The results obtained are i) NO, Cl, and HCl are physisorbed on a perfect carbonaceous surface whereas on a defective surface, these species are chemisorbed and lead to a modification of the surface; ii) on a carbonaceous surface, the presence of adsorbed Cl atoms leads to a strong trapping of the surrounding water molecules. This may be related to the highly hydrophilic nature of soot emitted during fires in industrial environments. Finally, the PDI method was applied to calculate the polarizability of PAHs to help at interpreting the absorption spectra of carbonaceous grains in the interstellar medium, including molecules for which no data was currently available
Ferrari, Arnaud. "Calorimétrie électromagnétique et recherche de neutrinos droits de Majorana dans l'expérience ATLAS". Phd thesis, Université Joseph Fourier (Grenoble), 1999. http://tel.archives-ouvertes.fr/tel-00005400.
Texto completo da fonte"MASS for Chamber Orchestra and Solo Mezzo-Soprano". Master's thesis, 2018. http://hdl.handle.net/2286/R.I.51675.
Texto completo da fonteDissertation/Thesis
Masters Thesis Music 2018
Rutgers, Gordon W. P. "Smoke off the water : determination of mass emission rates from off-gassing surfaces". 2013. http://hdl.handle.net/10170/653.
Texto completo da fonteLeckenby, Guy Timothy. "Remodelling a multi-anode ionisation chamber detector for accelerator mass spectrometry of 53Mn". Thesis, 2017. http://hdl.handle.net/1885/142833.
Texto completo da fonteОлійник, Назар Ігорович. "Моделювання температурних полів газів в робочих об’ємах камерних печей". Магістерська робота, 2021. https://dspace.znu.edu.ua/jspui/handle/12345/5343.
Texto completo da fonteUA : Робота викладена на 85 сторінках друкованого тексту, містить 2 таблиці, 29 рисунків. Перелік посилань включає 95 джерел з них на іноземній мові 23. Кваліфікаційна робота магістра присвячена моделюванню температурних полів газів в робочих об’ємах камерних печей. Виконано чисельне моделювання масових витрат пічних газів у камері реальної промислової печі. Проведені експериментальні дослідження на нагрівальній установці за умови створення електричного поля у її робочому просторі. Виконано розрахункову та промислову оцінки щодо доцільності подальшого використання результатів дослідження.
EN : The work is presented on 85 pages of printed text, contains 2 tables,29 figures.The list of references includes 95 sources, 23 of them in foreign language.The qualification work of the master is devoted to the modeling of temperature fields of gases in the working volumes of chamber furnaces. Numerical simulation of mass consumption of furnace gases in the chamber of a real industrial furnace was performed. Experimental studies on the heating plant were conducted provided that the electric field is created in its operating space. The calculation and industrial assessment on the expediency of further use of the results of the study were performed.
(11171943), Srivathsan Sudhakar. "Boiling in Capillary-Fed Porous Evaporators Subject to High Heat Fluxes". Thesis, 2021.
Encontre o texto completo da fonteМирошниченко, А. С., e A. S. Miroshnichenko. "Усовершенствованная камерная печь с автоматизированным импульсным нагревом металла : магистерская диссертация". Master's thesis, 2015. http://hdl.handle.net/10995/36217.
Texto completo da fonteA chamber furnace has been renovated with using some new technologies, as well as: reconstruction of the skeleton, using new thermoinsulation materials and installation of new gas burners operating at pulse mode with automatical control system. A task of metal mass heating up to the given temperature was solved. Heating processes at the pulse mode with set program was considered. The thermal calculation of furnace, hydraulic calculations of gas pipelines, air and flue gases supply systems were held. Economical efficiency estimation was given. Automatical control system was described.
Kaur, Navneet. "Fractionation, chemical and toxicological characterization of tobacco smoke components". Thèse, 2010. http://hdl.handle.net/1866/4652.
Texto completo da fonteTobacco smoke is an extremely complex aerosol composed of thousands of constituents distributed amongst the particulate and vapor phases. Toxicological effects have been linked to compounds present in both of these phases. Many biologically active compounds have been identified within tobacco smoke; however, there is a lack of studies correlating specific in vitro or in vivo biological responses to components within whole tobacco smoke. The goal of this research was to develop reliable and robust smoke fractionation methods using analytical separation and detection techniques in combination with in vitro toxicological assays. In a previous study by our collaborators, toxicological assessment of the particulate phase combustion products of twelve individual tobacco components revealed that the combustion products of chlorogenic acid were the most cytotoxic using the in vitro micronucleus test. Therefore, a preparative liquid chromatography method was developed in this work to fractionate the combustion products of chlorogenic acid to assess the bioactivity of these fractions and to identify the compounds responsible for the toxicity observed. The sub-fraction responsible for the most cytotoxic response comprised catechol, which was identified by liquid chromatography/time-of-flight mass spectrometry. Emerging studies have highlighted the toxicological significance of whole tobacco smoke and specifically the vapor phase, which shifted our focus to whole smoke analyses. The Borgwaldt RM20S® smoking machine in combination with British American Tobacco’s in vitro cell exposure chamber allow for the generation of fresh cigarette smoke in various doses and delivery to cell cultures. In vitro biological assays have a high degree of variability, thus, all other sources of variability must be accounted for to accurately assess toxicological endpoints; however, the reliability of dose delivery of the instrument had not been assessed until now. We have determined the reliability (RSD from 0.7-12%) of smoke generation and dilution by quantifying two reference standard gases (CH4 by flame ionization detection and CO by infrared absorption) and the tobacco particulate phase marker, solanesol (by high performance liquid chromatography-ultraviolet absorption detection). The relationship between dose and diluted vapor phase components found within the exposure chamber was then characterized by developing a headspace stir-bar sorptive extraction-gas chromatography/mass spectrometry method. The method repeatability gave an RSD from 10-13% for five reference compounds identified in the vapor phase of cigarette smoke. The maximal peak area response was obtained using the following experimental conditions: exposure-to-desorption time interval of 10 0.5 min, desorption temperature of 200 °C for 2 min, and a cryofocussing temperature of -75 °C. The dilution precision was found to yield a linear response of analyte abundance and was observed to be a function of concentration (RSD from 6.2-17.2 %) with quantities of 6-450 ng for the reference compounds. The findings obtained suggest the Borgwaldt RM20S® is a reliable tool to generate and deliver repeatable and linear doses of cigarette smoke to in vitro cell cultures. Our approach began with designing the methodology to work with an individual tobacco component, which could then be applied to a more complex sample, e.g., the vapor phase of cigarette smoke. The methodology developed can potentially serve as standardized methods for the assessment of instrumentation or screening of products for the Tobacco Industry.