Literatura académica sobre el tema "Plasma non thermique (PNT)"
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Artículos de revistas sobre el tema "Plasma non thermique (PNT)":
Ettori, S. y D. Eckert. "Tracing the non-thermal pressure and hydrostatic bias in galaxy clusters". Astronomy & Astrophysics 657 (24 de diciembre de 2021): L1. http://dx.doi.org/10.1051/0004-6361/202142638.
Pham, Quan DM, Martin Rodriguez, Ritu M. Ramamurthy, Sunil George, Jorge Figueroa, Anthony Atala, Christopher B. Doering, H. Trent Spencer, Christopher D. Porada y M. Graca Almeida-Porada. "Evaluation of Maternal Safety Following Prenatal Cell and Gene Therapy for Hemophilia a in a Large Animal Model Demonstrates Absence of Maternal Exposure to the Cells or Gene Products Infused into the Fetus". Blood 136, Supplement 1 (5 de noviembre de 2020): 32. http://dx.doi.org/10.1182/blood-2020-140883.
TATIBOUËT, Jean-Michel. "Plasma non thermique et traitement de l'air". Environnement, enero de 2013. http://dx.doi.org/10.51257/a-v1-g1794.
Tesis sobre el tema "Plasma non thermique (PNT)":
Korichi, Noussaiba. "Epuration d'effluents pharmaceutiques par plasmas non thermiques couplés à des procédés catalytiques". Electronic Thesis or Diss., Orléans, 2023. http://www.theses.fr/2023ORLE1057.
The work of this PhD thesis aims at studying a hybrid process for the treatment of organic molecules in water. It consists of the Non Thermal Plasma (NTP) process coupled with heterogeneous catalysis (Fenton-like type). Paracetamol is used as the target molecule for this study. Two different configurations of Dielectric Barrier Discharge (DBD) plasma reactor were used: (i) a multi-needles-to-plane reactor in static mode; (ii) a coaxial tubular reactor with flow of the solution to be treated. In order to evaluate the synergy between the two processes (plasma and catalysis), the treatments were applied separately and then coupled. The synergistic effects of the coupled plasma-catalysis process were demonstrated in terms of degradation rate, energy yield, and also in terms of pollutant mineralization, corresponding to a decrease of the organic molecules load in the solution with the conversion of organic carbon into inorganic carbon. The first part of the work carried out with the multi-needles-to-plane reactor allowed to establish the effective role of the plasma-catalysis coupling in comparison with the plasma process alone. Indeed, in coupling, a mineralization of 54% was reached after the 60 minutes of treatment and the energy yield was increased by a factor of two, thus reducing the cost of treatment. The work carried out on the coaxial reactor allowed us to study the effect of many parameters on plasma-catalysis coupling efficiency such as the composition of the injected gas, the gas and liquid flow rate, the position of the catalyst in relation to the plasma discharge, etc. We were thus able to show the interest of working in an oxygen-rich gas on kinetics of degradation and mineralization as well as the role of applied electrical power on the oxidation mechanisms. As an example, it was possible to obtain a mineralization of 70 % after 90 minutes under air, whereas under O₂/N₂ (80/20 sccm), the mineralization reached 95 %. The stability of the catalyst was also studied in terms of mineralization after several reuses of the catalyst. We also demonstrated the role of the hydroxyl radical (·OH) on the treatment with the use of radical scavengers. Indeed, the presence of methanol, known as a scavenger of hydroxyl radicals, a decrease of the degradation of nearly 50% was obtained and no mineralization was observed
Delaux, Joakim. "Activation de biopolymères par plasma atmosphérique non thermique". Thesis, Poitiers, 2016. http://www.theses.fr/2016POIT2310.
François Jerome's team developed new processes for the pretreatment of lignocellulosic biomass. This fundamental work is based on the use of non-thermal atmospheric plasma for the deplolymerization of biopolymers (cellulose, inuline) selectively. The advantage of this physical pretreatment is the non-using of catalysis or solvent and so it's resolve the dilution problem or the purifying problem usually met. A low consummation of energy can be cited too. This pretreatment could be increase the reactivity of biopolymers (hydrolysis for example) and get a better yield than the chemical or enzymes processes.The goal of the thesis is to understand what are the good conditions to obtain a cellulose more reactive for the chemical reactions and what the mechanism for the plasma treatment are. What kind of species react with the surface of the polymers and how they enter in the bulk ? What is the role of the nature and constitution (crystallinity, different polymer, kind of link…) ? Then, a study on the reactivity of the plasma cellulose was performed and the focus was put on the yield of glucose after acid hydrolysis. Like this, we can see the influence of the physical pretreatment (plasma, milling or both) on the cellulose. At the end, a mechanism is proposed by using all the information recovered in particularly with the structural analysis
Baudin, François. "Catalyse de NOx assistée par plasma "non thermique"". Paris 6, 2004. http://www.theses.fr/2004PA066416.
Ouni, Fakhreddine. "Production d'hydrogène et valorisation des alcanes par plasma non thermique". Orléans, 2006. http://www.theses.fr/2006ORLE2055.
Rodrigues, Anthony. "Caractérisation des interactions entre un plasma non-thermique et des matériaux". Thesis, Poitiers, 2013. http://www.theses.fr/2013POIT2288.
The interactions between the active species generated by a non thermal plasma and various material surfaces have been studied in this work. In a first part, biopolymers coming from biomass have been the subject of our investigations as they offer a great reservoir for a platform molecule, glucose, from which valuable chemicals can be generated. More specifically, the effects of a dielectric barrier discharge plasma on the structure and depolymerization of inulin, cellulose and starch were evaluated. For that purpose, the electrical and chemical characteristics of the plasma discharge were varied and their effects on the biopolymers evaluated in order to understand the reaction mechanisms. Our results showed that a plasma pre-treatment increased considerably the final monomer yield (in glucose and fructose) compared to the untreated starting material (84 and 54 % yield in glucose from plasma treated starch and cellulose, instead of 65 and 1 % for the same untreated samples). This effect could be partly explained by the depolymerization of the amorphous areas of the polymers by and acid attack within the plasma discharge.In a second part, the study focused on the removal of VOCs by coupling non-thermal plasma and inorganic materials. For this purpose, we designed and implemented an innovative apparatus. It consists of a plasma-catalyst reactor with controlled atmosphere that allows the analysis of the catalyst surface by IR spectroscopy (DRIFT). The decomposition of four VOCs (isopropanol, acetone, ethanol and toluene) adsorbed on different metallic oxides (y-Al2O3, CeO2 and TiO2) placed within the discharge area have been studied in situ using this method. The first results have enlightened the decomposition pathways of the different VOCs
Bouchoul, Nassim. "Valorisation du dioxyde de carbone par couplage plasma non-thermique et catalyse". Thesis, Poitiers, 2019. http://theses.univ-poitiers.fr/62720/2019-Bouchoul-Nassim-These.
The two main greenhouse gases emitted by human activities are carbon dioxide and methane. Within the context of the current environmental crisis, it has become vital to find a method to valorise these gases. Therefore, this thesis has been conducted to be a part of this process: CO2 and CH4 valorisation. To this end, dry reforming of methane was carried out by coupling non-thermal plasma and catalysts. Metal-based catalysts, such as Ni/Al2O3, are usually used for plasma-catalyst. However, the results are often dissimilar, and even contradictory, as far as conversions and selectivities are concerned. In order to better understand the reasons behind this heterogeneity, the influence of the nature of the solid was studied. For this purpose, metal oxides, such as γ-Al2O3, α-Al2O3, MgO, CaO, La2O3, ZnO, CeO2, SiO2, BaO, TiO2, and a zeolite, were selected because of their respective physicochemical properties (permittivity, acidity, basicity, specific surface). These oxides were submitted to identical tests with identical operational conditions, e.g. a dielectric barrier discharge reactor (DBD), 8W power (800 Hz frequency, 13 and 16 kV tension), a total output of 40 mL.min-1 and a CH4/CO2=0,5 ratio.The study of the physical characteristics of catalysts highlighted the impact of the material’s permittivity or of the size of its grains on the discharge. A high dielectric constant hindered the reaction. When TiO2 (εr=2903) was found in the discharge, it led to a decline in CH4 and CO2 conversions, as they decreased from respectively 20 and 9% without catalyst, to 5 and 2% with TiO2. Furthermore, when grains were too large, there was less surface accessible to plasma, which led to a fall in the reagents’ conversions. Indeed, they dropped from respectively 30 and 15% for CH4 and CO2 for small-sized grains (250-355µm), to 24 and 11% for the largest grains (800-1000µm). In addition to this, the study of the catalysts’ chemical properties showed how basicity influenced the conversions of carbon dioxide. It seemed that when there was a great number of basic sites in a solid, CO2 adsorption was likely to be better. Furthermore, a more detailed study was carried out by coupling calcium oxide with non-thermal plasma. Indeed, the former does not only have a low permittivity, but also a high number of basic sites. Structural and textural modifications appeared after plasma. This was shown by examining the influence of the CH4/CO2 ratio and of the temperature on CaO. When there was a CH4/CO2 = 2 ratio, for a temperature of 300°C, the production of water (reverse water-gas shift reaction) tended to result in the formation of Ca(OH)2 and CaCO3.When water (0,1g.h-1) was added to the reaction mixture, CaO hydroxylation and Ca(OH)2 carbonatation were observed. Furthermore, hydrated calcium hydroxide (Ca(OH)2+ 18% H2O) carbonatation is more likely to occur under plasma. The analysis of gases at the outlet by a mass spectrometer revealed an oscillatory phenomenon associated with CO2 adsorption. A reaction pathway, during which CO2 and H2O adsorption and elimination occur successively, was therefore put forward. A low-energy plasma (4W) is likely to cause carbonatation, as the solid is originally composed of 0,9Ca(OH)2, 0,9 H2O, 0,1 CaCO3, and is made of 0,1Ca(OH)2, 0,9CaCO3 after plasma. Thus, applying a non-thermal plasma seems to encourage CO2 diffusion at the core of Ca(OH)2+ 18% H2O. Carbonatation is a method to store CO2 but it is a slow process, which is often hindered by CO2 diffusion. In this study, plasma was proved to be a highly interesting process, provided that its efficiency could be increased
Arabi, Khadija. "Traitement par plasma non thermique d'alcools et produits issus de la pyrolyse ou de la gazéification de la biomasse". Phd thesis, Université d'Orléans, 2011. http://tel.archives-ouvertes.fr/tel-00705856.
Yao, Yijun. "Exploration d’un équipement d'observation non intrusif pour la compréhension des processus de projection thermique". Electronic Thesis or Diss., Bourgogne Franche-Comté, 2023. http://www.theses.fr/2023UBFCA025.
The fourth industrial revolution ushered in a new technological era characterized by digitalization and intelligence. In this context, there is a growing tendency to combine traditional technologies with more modern information technologies. This approach is opening up a new avenue of interpretation for scientific research.In the context of this study, which is specific to thermal spraying, the work involved using a non-invasive display device to collect on-line images of a jet seeded with powder particles. Processing these images using a specially developed algorithm resulted in the extraction of relevant and reliable data on the construction processes of a spray coating.Indeed, thermal spraying, as a traditional technology in the field of surface treatments, is also a very promising technique in the field of additive manufacturing. The coatings produced by this method have excellent properties and are widely applied in a variety of sectors. It therefore seems important to change the paradigm by incorporating computer technologies.The experiments carried out enabled us to observe the phenomena/processes involved in the plasma spraying of alumina particles, and an algorithm was developed to extract the interesting data contained in the images observed (size distribution of the flying particles, growth pattern of the coating on the substrate, deposition efficiency, etc.). In this way, it was possible to study the particle velocity and flight angle distributions throughout the plasma spraying process.Subsequently, validation of the observation technique and the algorithm applied to plasma spraying made it possible to study the existing cold spraying process. In situ observation of copper particles was therefore carried out to identify the stacking process of cold-sprayed layers and to quantify the size and dispersion of the particles forming the deposit. The study also combined different characterization methods to understand the process of layer stacking during cold spraying
FRESNET, FRANCOIS. "Traitement par plasma non-thermique des effluents issus d'un moteur fonctionnant dans des conditions d'exces d'air". Paris 11, 2001. http://www.theses.fr/2001PA112229.
Nastase, Raluca-Andreea. "Préparation de nanocelluloses aux propriétés interfaciales innovantes fonctionnalisées par traitement plasma non thermique à pression atmosphérique". Thesis, Nantes, 2019. http://www.theses.fr/2019NANT4006/document.
As an alternative to fossil source, cellulose is ideally placed to obtain sustainable and available materials. In order to respect the environmental constraints, the economic efficiency and to be less detrimental to human health, non-thermal plasma technology is proposed as a method for the nanocellulose functionalization and valorisation. This technology that requires no or few reagents, needs only an energy supply and a gas flow to lead to the modification of nanocellulose by generating highly reactive species at room temperature. The implementation of the reactions by plasma has been carried out in liquid media, using several aqueous solvents and gases (N₂, O₂, air, NHᴣ), their chemical nature allowing access to specific functionalizations such as oxidation, amination, etc. The high reactivity of plasma allows the activation of molecules without using polluting or expensive methods. Because of its efficiency, its ease of implementation and its low energy consumption, the modification of nanocellulose by non-thermal plasma at atmospheric pressure will open new ways to innovative chemical modification of biomass