Tesis sobre el tema "Physical and chemical characterizations"
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Kavanagh, Debbie M. "Chemical and physical characterization of clay bodies". Thesis, Aston University, 2001. http://publications.aston.ac.uk/9643/.
Texto completoFracasso, Guido <1960>. "Synthesis and Physical-Chemical characterization of Metallic Nanoparticles". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2895/2/Fracasso_Guido_tesi.pdf.
Texto completoFracasso, Guido <1960>. "Synthesis and Physical-Chemical characterization of Metallic Nanoparticles". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2895/.
Texto completoWang, Junwei. "Chemical doping of metal oxide nanomaterials and characterization of their physical-chemical properties". Case Western Reserve University School of Graduate Studies / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=case1333829935.
Texto completoBouvet-Marchand, Agathe. "Syntheses, preparations and physico-chemical characterizations of functional hybrid thin layers". Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0338.
Texto completoTo face the technical challenges of our time, more and more performing materials are needed. However, neither plastic nor metals are sufficient to answer the different current problematic that require materials to be cheap, easily processable, industrializable with oustanding properties (electronic conductivity, transparency, self-cleaning, anti-corrosive etc.). These last years, the association plastic-metal or "hybrid" appears to be a promising route. Indeed, in these materials, not only properties of the plastic and metal are added but a synergy happens leading to unique properties. However, reaching this synergetic effect is not a straightforward task and an accurate control of the interaction between the two counterparts is crucial. During this Ph.D, thin hybrid films (from nanometer to micrometer) were prepared to answer various industrial and academic problematic. Materials dedicated to be used in fingerprint-sensor with very high resolution, to encapsulate biological media for electronic microscopy analysis, to collect an electrical signal or prevent water degradation on screens were elaborated. In order to answer the specific requirements of these different applications, particular molecules were designed to enable a good interaction with the inorganic components and their assembly was carefully adjusted to obtain the desired properties in the resulting material
Bouvet-Marchand, Agathe. "Syntheses, preparations and physico-chemical characterizations of functional hybrid thin layers". Electronic Thesis or Diss., Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0338.
Texto completoTo face the technical challenges of our time, more and more performing materials are needed. However, neither plastic nor metals are sufficient to answer the different current problematic that require materials to be cheap, easily processable, industrializable with oustanding properties (electronic conductivity, transparency, self-cleaning, anti-corrosive etc.). These last years, the association plastic-metal or "hybrid" appears to be a promising route. Indeed, in these materials, not only properties of the plastic and metal are added but a synergy happens leading to unique properties. However, reaching this synergetic effect is not a straightforward task and an accurate control of the interaction between the two counterparts is crucial. During this Ph.D, thin hybrid films (from nanometer to micrometer) were prepared to answer various industrial and academic problematic. Materials dedicated to be used in fingerprint-sensor with very high resolution, to encapsulate biological media for electronic microscopy analysis, to collect an electrical signal or prevent water degradation on screens were elaborated. In order to answer the specific requirements of these different applications, particular molecules were designed to enable a good interaction with the inorganic components and their assembly was carefully adjusted to obtain the desired properties in the resulting material
Brooker, Michael R. "Physical and Chemical Characterization of Self-Developing Agricultural Floodplains". The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1513778530623727.
Texto completoVereš, Ján, Štefan Jakabský y Vladimír Šepelák. "Chemical, physical, morphological and structural characterization of blast furnace sludge". Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-188184.
Texto completoVereš, Ján, Štefan Jakabský y Vladimír Šepelák. "Chemical, physical, morphological and structural characterization of blast furnace sludge". Diffusion fundamentals 12 (2010) 88, 2010. https://ul.qucosa.de/id/qucosa%3A13909.
Texto completoRISI, GIULIA. "PHYSICAL-CHEMICAL CHARACTERIZATION OF POLYSACCHARIDES AND THEIR INTERACTION WITH PROTEINS". Doctoral thesis, Università degli studi di Pavia, 2020. http://hdl.handle.net/11571/1318349.
Texto completoToughchi, Mehrdad Abbasi. "Chemical quality of Iranian tea. Comparison with foreign tea". Master's thesis, ISA, 2017. http://hdl.handle.net/10400.5/15091.
Texto completoSalberg, Alesia C. "Characterization of the Physical and Chemical Networks in Filled Rubber Compounds". University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1258383036.
Texto completoGONTIJO, LAYNE OLIVEIRA DE LUCAS. "PHYSICAL CHEMICAL CHARACTERIZATION OF THE MERCERIZING EFFECT ON PIAÇAVA FIBERS ATTALLEA FUNIFERA". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2018. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=35995@1.
Texto completoCOORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
PROGRAMA DE SUPORTE À PÓS-GRADUAÇÃO DE INSTS. DE ENSINO
O uso de fibras naturais como reforço em materiais compósitos vem ganhando destaque em diversos setores industriais, principalmente devido às restrições ambientais, que impõem requisitos legais relacionados ao uso de produtos sintéticos, visando a reutilização e substituição de matérias-primas não renováveis. As fibras naturais são biodegradáveis e apresentam propriedades e morfologia muito atraentes. Dentre elas, novas categorias de fibras estão sendo investigadas, como é o caso da fibra de piaçava, oriunda da palmeira Attalea funifera Martius. Sua fibra longa, lisa, resistente e de textura impermeável apresenta propriedades mecânicas semelhantes às fibras de coco, amplamente utilizadas pela indústria. Um dos desafios no uso dessas fibras como reforço em materiais compósitos é melhorar a interação entre a fibra e matriz polimérica, uma vez que as fibras naturais são hidrofílicas e as matrizes são hidrofóbicas, desenvolvendo interfaces fracas. Em alguns casos, tratamentos químicos específicos (por exemplo, o método de mercerização) podem melhorar esta interface, removendo parte da lignina e celulose de fibras, tornando a superfície rugosa compatível com a matriz polimérica. Neste trabalho, vários parâmetros foram avaliados através de MEV, microCT, FTIR e microscopia de varredura laser confocal (CLSM) da fibra de piassava antes e depois da mercerização em solução aquosa de NaOH a 10 por cento em peso. As análises permitiram avaliar que o tratamento alcalino promoveu uma limpeza profunda na superfície das fibras, removendo protrusões de sílicas do vegetal, com aumento do índice de cristalinidade, além de remover frações de lignina, hemicelulose, celulose, ceras e outras impurezas, causando desfibrilação do tecido. Também houve aumento da área superficial, rugosidade e porosidade das fibras após o tratamento químico.
The use of natural fibers to reinforce composite materials has been gaining considerable notice in many industrial fields. This is mainly due to environmental restrictions, which impose legal requirements related to the use of synthetic products, aiming at the reuse and replacement of non-renewable raw materials, which cause less damage to the environment. Natural fibers are biodegradable, renewable resources with very attractive properties and morphology. Among them, new categories of fibers are being investigated, as the case of piassava fiber, from the palm of Attalea funifera Martius. Its long, smooth, sturdy and waterproof textured fiber has similar mechanical properties to the coconut fibers widely used in the industry. One of the challenges in using these fibers as reinforcement in composite materials is to improve the interaction between fiber and polymer matrix, since the natural fibers are hydrophilic and the matrices are hydrophobic, developing weak interfaces. In some cases, specific chemical treatments (eg the mercerization method) can improve this interface by removing part of the lignin and cellulose from fibers, making the rough surface compatible with the polymer matrix. In this work, several parameters were evaluated through MEV, microCT, FTIR and confocal laser scanning microscopy (CLSM) of piassava fibers, before and after mercerization with 10 percent by weight aqueous NaOH solution. The analyzes allowed to evaluate that the alkaline treatment promoted a deep cleaning on the surface of the fibers, removing protrusions of silica from the vegetable, besides removing lignin, hemicellulose, cellulose, waxes and other impurities, causing tissue defibrillation. Also, it was able to increase the surface area, roughness and porosity of the fibers after chemical treatment.
Sandoval, Kathia a. "Physical and Chemical Characterization of Crude Oil-Water Mixtures: Understanding the Effects of Interfacial Process to Chemical Bioavailability". FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/2464.
Texto completoThierry-Jebali, Nicolas. "Caractérisations et modélisations physiques de contacts entre phases métalliques et Nitrure de Gallium semi-conducteur". Phd thesis, Université Claude Bernard - Lyon I, 2011. http://tel.archives-ouvertes.fr/tel-00744661.
Texto completoSanchez, Javier. "Characterization of activated carbon produced from coffee residues by chemical and physical activation". Thesis, KTH, Skolan för kemivetenskap (CHE), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-32872.
Texto completoChoo, Hyunwook. "Engineering behavior and characterization of physical-chemical particulate mixtures using geophysical measurement techniques". Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/52178.
Texto completoMalloy, Quentin Gerald James. "Chemical and physical characterization of secondary organic aerosol formation from select agricultural emissions". Diss., UC access only, 2009. http://proquest.umi.com/pqdweb?index=33&did=1871857121&SrchMode=1&sid=2&Fmt=7&retrieveGroup=0&VType=PQD&VInst=PROD&RQT=309&VName=PQD&TS=1270140114&clientId=48051.
Texto completoMarchetti, Marco <1980>. "Design, synthesis and Chemical-physical characterization of photocatalytic inorganic nanocrystals for technological applications". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5737/2/marchetti_marco_tesi.pdf.
Texto completoMarchetti, Marco <1980>. "Design, synthesis and Chemical-physical characterization of photocatalytic inorganic nanocrystals for technological applications". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5737/.
Texto completoBarbieri, Sara <1981>. "Characterization of Food Products by Chemical, Physical and Sensory Properties: a Combined Approach". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/7458/1/Barbieri_Sara_Tesi.pdf.
Texto completoLim, McKenzie C. H. "Chemical and physical characterization of aerosols from the exhaust emissions of motor vehicles". Thesis, Queensland University of Technology, 2007. https://eprints.qut.edu.au/16428/1/McKenzie_Lim_Thesis.pdf.
Texto completoLim, McKenzie C. H. "Chemical and physical characterization of aerosols from the exhaust emissions of motor vehicles". Queensland University of Technology, 2007. http://eprints.qut.edu.au/16428/.
Texto completoROSESTOLATO, Davide. "Chemical and Physical Characterization of Electrocatalysts based on Iridium Oxide and prepared by Sol-Gel and Physical Vapor Deposition". Doctoral thesis, Università degli studi di Ferrara, 2014. http://hdl.handle.net/11392/2389035.
Texto completoCassity, Kelby Brandan. "CHEMICAL MODIFICATION AND CHARACTERIZATION OF CARBON NANOTUBES". UKnowledge, 2010. http://uknowledge.uky.edu/gradschool_diss/73.
Texto completoOzkan, Alp. "CO2 splitting in a dielectric barrier discharge plasma: understanding of physical and chemical aspects". Doctoral thesis, Universite Libre de Bruxelles, 2016. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/239300.
Texto completoCarbon dioxide appears as one of the most problematic gases for the environment, mostly because it is responsible for global warming. This is why its increasing concentration into the atmosphere, mainly due to anthropogenic activities, is a real concern for planet Earth. In order to prevent the release of large amounts of CO2, its conversion into value-added products is of great interest. In this context, plasma-based treatments using dielectric barrier discharges (DBDs) are nowadays more and more used for the conversion of this gas. In this thesis, we investigated the CO2 splitting process into CO and O2 via a flowing cylindrical DBD and we studied its conversion and energy efficiency by means of several diagnostic methods, such as mass spectrometry to determine the conversion and energy efficiency of the process, optical emission spectroscopy for gas temperature measurements, and an oscilloscope for electrical characterization, in order to obtain a better understanding of the CO2 discharge itself.First, we focused on an extensive experimental study of a pure CO2 plasma where different parameters were varied, such as the gas residence time, the operating frequency, the applied power, the pulsation of the AC signal, the thickness and the nature of the dielectric. CO2 discharges typically exhibit a filamentary behavior, consisting of many microdischarges, which act as the main source of reactivity in a DBD. A detailed insight in the physical aspects was achieved by means of an in-depth electrical characterization, allowing more insight in the electrical properties of the discharge and more specifically in the microdischarges, which are spread out throughout the active zone of the plasma. It was found throughout this work that the plasma voltage, which reflects the electric field and thus determines how the charged particles are accelerated, the plasma current, which reflects the electron density, but also the number of microdischarges and their average lifetime, play an important role in the efficiency of the CO2 dissociation process. It was revealed that the microdischarge number is important as it represents the repartition of the locations of reactivity. Indeed, as the microfilaments are more spread out in the same discharge volume, the probability for the CO2 molecules to pass through the reactor and interact with at least one microdischarge filament becomes more important at a larger number of microfilaments.The second part of the thesis was dedicated to discharges combining CO2 and H2O or CH4, both being hydrogen source molecules. The combined CO2/H2O or CO2/CH4 conversion allows forming value-added products like syngas (CO and H2), but also hydrocarbons (C2H6, C2H4, C2H2 and CH2O), at least in the presence of methane. Throughout this study, we tried to obtain a better knowledge of the chemistry and physic behind these conversion processes.
Doctorat en Sciences
info:eu-repo/semantics/nonPublished
Kokubo, Shinsuke. "Characterization of Physical and Chemical Properties of Synthetic Polymer using Ion Mobility-Mass Spectrometry". Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2017. http://hdl.handle.net/11858/00-1735-0000-0023-3FAC-5.
Texto completoBarzegar, HamidReza. "Synthesis and Characterization of Carbon Based One-Dimensional Structures : Tuning Physical and Chemical Properties". Doctoral thesis, Umeå universitet, Institutionen för fysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-97551.
Texto completoPark, Geunhyung. "Characterization of actuator behaviors of ferrogels obtained from physical and chemical cross-linking methods". [Ames, Iowa : Iowa State University], 2008.
Buscar texto completoCIMO', Giulia. "CHARACTERIZATION OF CHEMICAL AND PHYSICAL PROPERTIES OF BIOCHAR FOR ENERGY PURPOSES AND ENVIRONMENTAL RESTORATION". Doctoral thesis, Università degli Studi di Palermo, 2014. http://hdl.handle.net/10447/90867.
Texto completoConnors, Sandra André. "Chemical and physical characterization of the degradation of vulcanized natural rubber in the museum environment". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ36018.pdf.
Texto completoPopovic, Nevena. "Physical and chemical characterization and upgrading of char derived from scrap tires by ultra fast pyrolysis /". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0015/MQ54949.pdf.
Texto completoDi, Silvio Desire. "Physical-chemical characterization of nanoparticles in relevant biological environments and their interactions with the cell surface". Thesis, University of East Anglia, 2015. https://ueaeprints.uea.ac.uk/58403/.
Texto completoMerkel, Marcel Patrick [Verfasser] y A. [Akademischer Betreuer] Powell. "Synthesis, characterization and physical/chemical properties of polyoxometalate-based materials / Marcel Patrick Merkel ; Betreuer: A. Powell". Karlsruhe : KIT-Bibliothek, 2020. http://d-nb.info/1205001964/34.
Texto completoWessman, Per. "Physico-Chemical Investigations of, and Characterization of Model Membranes for, Lipid-Peptide Interactions". Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-89432.
Texto completoPhefadu, Kopano Conferance. "Physico-chemical characterization and spatial variability of soils in the research block at University of Limpopo Experimental Farm". Thesis, University of Limpopo, 2015. http://hdl.handle.net/10386/1686.
Texto completoThere exists a considerable level of spatial variability in soil physical and chemical properties within the research block; and the soils are generally shallow. Of all the measured parameters, electrical conductivity, Bray-1 P, exchangeable potassium, calcium and sodium as well as extractable iron and zinc showed a huge percent of variation across the field. Soil variability maps indicated the degree of variability within the research block. The spatial variability of the characterized parameters was significant across the research block. A correlation study was conducted to investigate the relationship between the measured soil physical and chemical properties. Regular soil analyses should be conducted to avoid failure/delay of experiments. It is recommended that inputs such as irrigation and fertilizer application must be varied based on varying soil conditions across the research block.
VLIR project 6 leaders
Gao, Min. "CHEMICAL CHARACTERIZATION OF SOIL ORGANIC MATTER IN AN OLIGOTROPHIC, SUBTROPICAL, FRESHWATER WETLAND SYSTEM: SOURCES, DIAGENESIS AND PRESERVATION". FIU Digital Commons, 2007. http://digitalcommons.fiu.edu/etd/3625.
Texto completoGao, Min. "Chemical characterization of soil organic matter in an oligotrophic, subtropical, freshwatwer wetland system : sources, diagenesis and preservation". FIU Digital Commons, 2007. http://digitalcommons.fiu.edu/etd/3618.
Texto completoPanthani, Matthew George. "Colloidal Nanocrystals with Near-infrared Optical Properties| Synthesis, Characterization, and Applications". Thesis, The University of Texas at Austin, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3572875.
Texto completoColloidal nanocrystals with optical properties in the near-infrared (NIR) are of interest for many applications such as photovoltaic (PV) energy conversion, bioimaging, and therapeutics. For PVs and other electronic devices, challenges in using colloidal nanomaterials often deal with the surfaces. Because of the high surface-to-volume ratio of small nanocrystals, surfaces and interfaces play an enhanced role in the properties of nanocrystal films and devices.
Organic ligand-capped CuInSe2 (CIS) and Cu(InXGa 1-X)Se2 (CIGS) nanocrystals were synthesized and used as the absorber layer in prototype solar cells. By fabricating devices from spray-coated CuInSe nanocrystals under ambient conditions, solar-to-electric power conversion efficiencies as high as 3.1% were achieved. Many treatments of the nanocrystal films were explored. Although some treatments increased the conductivity of the nanocrystal films, the best devices were from untreated CIS films. By modifying the reaction chemistry, quantum-confined CuInSe XS2-X (CISS) nanocrystals were produced. The potential of the CISS nanocrystals for targeted bioimaging was demonstrated via oral delivery to mice and imaging of nanocrystal fluorescence.
The size-dependent photoluminescence of Si nanocrystals was measured. Si nanocrystals supported on graphene were characterized by conventional transmission electron microscopy and spherical aberration (Cs)-corrected scanning transmission electron microscopy (STEM). Enhanced imaging contrast and resolution was achieved by using Cs-corrected STEM with a graphene support. In addition, clear imaging of defects and the organic-inorganic interface was enabled by utilizing this technique.
Zhang, Jin. "Electrodeposition of novel nanostructured and porous materials for advanced applications: synthesis, structural characterization and physical/chemical performance". Doctoral thesis, Universitat Autònoma de Barcelona, 2016. http://hdl.handle.net/10803/393985.
Texto completoThis Thesis dissertation covers the electrochemical synthesis of advanced metallic materials in two different configurations, namely porous films and segmented nanowires (NWs). Porous films are prepared by hydrogen bubble-assisted electrodeposition (macroporous Ni and Cu-Ni systems) and self-organized template (block-copolymer P123) assisted electrodeposition (nanoporous Ni). The Cu-Ni films exhibit a hierarchical porosity (they consist of micron-sized roughly spherical pores and nanodendritic walls), superhydrophobic character and ferromagnetic properties at room temperature (due to the occurrence of phase separation during deposition). Furthermore, they are electrocatalytically active toward hydrogen evolution reaction in alkaline media, outperforming pure Cu and Ni porous films prepared under similar conditions. Meanwhile, segmented CoPt/Cu/Ni and CoPt/Ni NWs with controlled segment lengths are prepared by electrodeposition in polycarbonate (PC) membranes. Due to the dissimilar ferromagnetic properties of CoPt and Ni segments (hard- and soft-ferromagnetic character, respectively), it is possible to achieve an antiparallel alignment of the magnetization of the segments if their lengths are properly tuned. This would make it possible to minimize aggregation of the NWs once released from the PC template. These findings have been validated by analytical calculations. The macroporous Cu-Ni and Ni films are used as scaffolds for the fabrication of novel nanocomposite layers, namely ZnO@CuNi, Al2O3@Ni and Co2FeO4@Ni, by applying sol-gel coating and atomic layer deposition techniques. The latter allows a nanometer-thick conformal coating of the metallic host. The resulting nanocomposites combine the properties coming from the metallic matrix and those arising from the coating (photoluminescence and photocatalytic properties in the case of ZnO, changes in the wettability for Al2O3 and Co2FeO4). Finally, the nanomechanical properties of nanoporous Ni films are evaluated and a thickness-dependence of both the Young’s modulus and the yield strength with the maximum applied force during nanoidentation is disclosed, due to the graded porosity of these films.
Spencer, Matthew Todd. "New approaches for the chemical and physical characterization of aerosols using a single particle mass spectrometry based technique". Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2007. http://wwwlib.umi.com/cr/ucsd/fullcit?p3264603.
Texto completoTitle from first page of PDF file (viewed August 2, 2007). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references.
Buccella, Mauro. "Color masterbatches for polyamide 6 fibers. Optimization of compounding and spinning processes. Physical-chemical characterization of industrial products". Doctoral thesis, Università degli studi di Trento, 2014. https://hdl.handle.net/11572/368973.
Texto completoBuccella, Mauro. "Color masterbatches for polyamide 6 fibers. Optimization of compounding and spinning processes. Physical-chemical characterization of industrial products". Doctoral thesis, University of Trento, 2014. http://eprints-phd.biblio.unitn.it/1236/1/PhD_Thesis_-_Eprints_-_Mauro_Buccella.pdf.
Texto completoRichards, Paul. "Characterization of the electrical and physical properties of scandium nitride grown using hydride vapor phase epitaxy". Manhattan, Kan. : Kansas State University, 2010. http://hdl.handle.net/2097/4090.
Texto completoRoy, Choudhury Adarsh. "Defining Black: Characterization of Soot Reactivity with Thermogravimetrical Methods : Definiera svart: Karaktärisering av sotreaktivitet med termogravimetriska metoder". Thesis, KTH, Tillämpad fysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-287478.
Texto completoAvgasutsläpp i ett fordon måste strömma genom avgasefterbehandling i ett dieselfordon. I en dieselmotor behandlas avgasutsläppen med dieseloxidationskatalysator (DOC), dieselpartikelfilter (DPF) och selektiv katalytisk reduktion (SCR). Varje motor producerar olika typer av sot beroende på körcykeln. I denna avhandling gjordes en undersökning av sotoxidationen i DPF för att minska nettobränsleförbrukningen och därmed optimera motorn. Detta projekt fokuserar på DPF, där sot och aska fångas på filterväggarna när utsläppen flyter genom dieselpartikelfiltret. Under en tidsperiod ackumuleras sot och får trycket inuti filtret att öka. För att minska mottrycket på grund av sotansamling måste sot avlägsnas från filtret, vilket görs genom en regenereringsprocess där sot oxideras. För att förstå sotoxidationen i DPF studerar vi sotens kemiska kinetik. Sotet reagerar med NO2, O2 och N2 i ett instrument för termogravimetrisk analys (TGA) under isotermiska förhållanden. Två sotprover, SORT-1 och FORCED 360 analyserades med TGA, hastighetsekvationerna härleddes från användning av Arrhenius-typskinetik och data bearbetades av MATLAB. Den hastighet med vilken sot oxideras av NO2 och O2 för SORT-1 är högre än för FORCED 360. Denna trend observeras på liknande sätt när båda sotproverna reagerar med endast O2. När reaktion genom sotoxidation äger rum med O2 och NO2 kräver de en lägre temperatur på 250 ° C - 400 ° C än jämfört med prover som bara reagerar med O2 med en temperatur på 350 ° C - 500 ° C. För att förstå de förhållanden som påverkar sotoxidation varierades syrekoncentrationen och det visade sig att vid högre syrekoncentration var sotet oxiderat nästan konstant. Därefter analyserades sotkinetiken genom att hitta reaktionshastigheten, reaktionsordningen och slutligen aktiveringsenergin. Reaktionsordningen för FORCED 360 och SORT-1 varierar och lutningen i diagrammet, logaritmen för reaktionskonstanten mot logaritmen av massan visar en icke-linjäritet i den tidigare på grund av den långsammare reaktionshastigheten i SORT-1 än i FORCED 360. Aktiveringsenergin konstaterades vara 39,3 kJ / mol för SORT-1 och för FORCED 360, 60,8 kJ / mol.
Ruiz-Córdova, Sergio S. Webber Elliott Clifford Bayne David Roberge. "Physical-chemical and biological characterization of small streams following intensive forest management practices in the coastal plain of Alabama". Auburn, Ala., 2007. http://repo.lib.auburn.edu/EtdRoot/2007/FALL/Fisheries_and_Allied_Aquacultures/Thesis/Ruiz-cordova_Sergio_36.pdf.
Texto completoUnsal, Emre. "Integrated Real Time Studies to Track all Physical and Chemical Changes in Polyimide Film Processing From Casting to Imidization". University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1384129535.
Texto completoMitchell, Beth Louise. "Characterization of the Physical, Chemical, and Biological Factors that Control the Fate and Transport of Bacteria through Glacial-Outwash Sediments". Miami University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=miami1164820103.
Texto completoDusek, Ulrike. "Characterization of marine boundary layer aerosol from north Atlantic and European sources : physical and chemical properties and climate forcing parameters /". Thesis, Connect to this title online; UW restricted, 2002. http://hdl.handle.net/1773/10065.
Texto completoArroyo, Molina Javier. "Towards a virtual climate chamber – A physical experimental study". Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-282848.
Texto completoDet här projektet fokuserar på att experimentellt karakterisera ett av verktygen som används i Ericsson AB för att testa produktprestanda - klimatkammaren. Genom att utföra experiment inuti klimatkammaren och efterbehandla de erhållna data, kan man få en förståelse för luftflödet inuti kammaren och jämföra resultat med experimentella data från utomhus. Ett av delmomenten i detta arbete bevisar hypotesen: 'Vindens energipotential är större än inomhus', vilket visar sig vara sant när man jämför värden för flödets integrala längdskalor, med samma medelvärde i vindhastighet. Den andra etappen av detta projekt är att erhålla en värdefull experimentell vägledning som kommer att tjäna till att konstruera en virtuell modell av klimatkammaren. Med slutsatserna från experimenten, som innefattar värmeöverföring, kan gränsvillkor för den numeriska modellen fastställas.