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Dissertations / Theses on the topic 'THz emission sources'

Author: Grafiati

Published: 22 February 2025

Last updated: 31 July 2025

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1

Abdul, Hadi Zeinab. "Terahertz emission spectroscopy of multiferroic bismuth ferrite : insights into ultrafast currents and phonon dynamics." Electronic Thesis or Diss., Le Mans, 2024. http://www.theses.fr/2024LEMA1030.

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La technologie térahertz (THz) a suscité un intérêt significatif dans la communauté scientifique en raison de sa position unique dans le spectre électromagnétique, complétant le gap entre les régions des micro-ondes et de l'infrarouge. Cette radiation est non ionisante et peut pénétrer divers matériaux sans les endommager, ce qui la rend très attirante pour de nombreuses applications potentielles. Les avancées récentes dans la technologie des lasers ultra-rapides ont élargi l'exploration du rayonnement THz à un large éventail de technologies passionnantes. Elle est désormais utilisée dans des

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2

Ayoub, Anas. "Sources laser ultrarapides performantes dans le moyen IR et le Tz." Thesis, Normandie, 2020. http://www.theses.fr/2020NORMR044.

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La sonde atomique tomographique est un instrument d’analyse de la matière à trois dimensions avec une résolution atomique. Cet instrument s’appuie sur l’effet de champ électrique généré à l’extrémité d’un échantillon taillé sous la forme d’une aiguille nanométrique pour faire évaporer les atomes de surface qui sont collectés par un détecteur à deux dimensions. La mesure du temps de vol des ions dont l’évaporation est déclenchée par une impulsion électrique ou optique permettent de remonter à la composition chimique en plus de la localisation 3D des atomes. Dans les sondes atomiques actuelles,

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3

Copperwheat, C. M. "The optical emission from ultraluminous X-ray sources." Thesis, University College London (University of London), 2007. http://discovery.ucl.ac.uk/1445395/.

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Ultraluminous X-ray sources (ULXs) are point-like, non-nuclear sources which exceed the Eddington luminosity for a stellar mass black hole (BH). The emission from these sources might be beamed or super-Eddington, but it has also been pro posed that the compact object in these sources are intermediate mass BHs (IMBHs), which fit in the mass range between the two known populations of BH in the galaxy. The existence of IMBHs is under intense debate, and study of the X-ray data has been unable to resolve this issue. This thesis describes a model I have constructed in order to examine the optical/I

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4

Xiu, Meng. "Evaluating the emission of air pollutants from different sources." Thesis, Queensland University of Technology, 2022. https://eprints.qut.edu.au/235386/1/Meng%2BXiu%2BThesis%284%29.pdf.

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This thesis is an evaluative study of air pollution emissions from different sources in Australia and overseas. It investigates indoor and outdoor sources, including indoor combustion, electric equipment, asphalt pavement, forest fires and vehicular traffic. Based on evaluating sources, a simple practical method is proposed to identify pollution sources. This research has important scientific implications and potential for future practical applications, given the paucity of quantitative air quality studies available for pollution control.

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5

Domański, Grzegorz. "The contribution of different sources to the total CO2 emission from soils /." Stuttgart : Inst. für Bodenkunde und Standortslehre, 2003. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=012802754&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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6

Lohmann, Rainer. "Studies on the atmospheric sources, fate and behaviour of dioxins and furans." Thesis, Lancaster University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322093.

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7

Holt, Joanna. "An observational study of the emission line systems in compact radio sources." Thesis, University of Sheffield, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419256.

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8

Hunter, Gillian C. "The behaviour of plumes from point sources in stratified flows." Thesis, Open University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315334.

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9

Ursini, Francesco. "Constraining the high energy emission sources in the environment of supermassive black holes." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAY062/document.

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Des trous noirs supermassifs de plusieurs centaines de millions de masses solaires résident au centre de la plupart des galaxies massives. Dans 90% des cas, ces trous noirs sont dans état quiescent, très peu lumineux. Cependant, dans les 10% restant, des processus extrêmement violents sont observés, avec la libération d'énorme quantités d'énergie no- tamment en UV, X et gamma. On observe aussi parfois des jets puissants de matière pouvant s'étendre sur plusieurs centaines de kpc. Le coeur de ces galaxies sont appelés Noyaux Actifs de Galaxie (NAG). Ce sont parmis les objets les plus lumineux d

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10

Falcetelli, Francesco. "Modelling of Pencil-Lead Break Acoustic Emission Sources using the Time Reversal Technique." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16554/.

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In Acoustic Emissions (AE), Hsu-Nielsen Pencil-Lead Breaks (PLB) are used to generate sound waves enabling the characterization of acoustic wave speed in complex structures. The broadband signal of a PLB represents a repeatable emission, which can be applied at different regions of the structure, and therefore can be used to calibrate the localization algorithms of the AE system. In recent years, the use of Finite Element Method (FEM) has flourished for modelling acoustic Lamb wave propagation, which is present in thin plate-like structures. The primary challenge faced by the AE community is t

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11

Hennen, Mark. "Identifying mineral dust emission sources in the Middle East using remote sensing techniques." Thesis, University of Reading, 2017. http://centaur.reading.ac.uk/76801/.

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This investigation presents a new high-resolution mineral dust climatology for the Middle East, describing the dust emission source of over 27,000 dust emission events during the period 2006 – 2013. The inventory was derived from the dust RGB product of the Spinning Enhanced Visual and InfraRed Imager (SEVIRI) on-board Meteosat’s second-generation satellite (MSG). Mineral dust emissions were derived from visual inspection of the SEVIRI scenes, which have 4-5 km2 spatial and 15-minute temporal resolution. The location of every emission event was recorded in a database, along with time and traje

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12

Field, Robert Alexander. "The sources and behaviour of selected urban air pollutants." Thesis, Imperial College London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309084.

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13

Perez, Eduardo G. "Analytical solution to the wave equation with discrete pressure sources a model for the Rijke tube /." Morgantown, W. Va. : [West Virginia University Libraries], 2008. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5718.

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Thesis (Ph. D.)--West Virginia University, 2008.<br>Title from document title page. Document formatted into pages; contains x, 97 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 84-88).

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14

Gomis, Melissa Ines. "From emission sources to human tissues: modelling the exposure to per- and polyfluoroalkyl substances." Doctoral thesis, Stockholms universitet, Institutionen för miljövetenskap och analytisk kemi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-141034.

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Produced since the 1950’s, per- and polyfluoroalkyl (PFASs) substances are persistent, bioaccumulative and toxic compounds that are ubiquitous in the environment. Being proteinophilic with a tendency to partition to protein-rich tissues, PFASs have been found in human serum worldwide and in wildlife with a predominance of long-chain perfluoroalkyl carboxilic acids (C7-C14 PFCAs) and perfluoroalkyl sulfonic acids (C6-C9 PFSAs). Due to rising concern regarding their hazardous properties, several regulatory actions and voluntary industrial phase-outs have been conducted since early 2000s, shiftin

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15

Liu, Horng-Twu. "The use of high frequency stress waves for detecting shaft seal rubbing and source location." Thesis, Cranfield University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309839.

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16

Alanezi, Salwa. "Emission inventories from Kuwait petroleum refineries and respective ground level concentration of pollutants in the neighboring residential area." Thesis, Loughborough University, 2013. https://dspace.lboro.ac.uk/2134/12544.

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The State of Kuwait has three large refineries, namely, Mina Al Ahmadi Refinery, Mina Abdullah Refinery and Shuaiba Refinery. These refineries process and refine Kuwait Crude Oil through different process units. There are many heaters, boilers and flares that form a part of the complicated equipment which enhance the different petroleum processes. Fuel gas is used as a firing fuel for those heaters and boilers. As a result, stack emissions like SO2, NOx, CO are predominantly present in the flue gases and this study focuses on those emissions and their impact on the surrounding residential area

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17

Elton, Stephen Dennis. "A search for celestial sources of very high energy gamma-ray emission using the atmospheric Cerenkov technique /." Title page, contents and summary only, 1989. http://web4.library.adelaide.edu.au/theses/09PH/09phe51.pdf.

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18

Constantin, Anca. "Linking the Power Sources of Emission-Line Galaxy Nuclei from the Highest to the Lowest Redshifts." Ohio University / OhioLINK, 2004. http://www.ohiolink.edu/etd/view.cgi?ohiou1097611827.

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19

White, Sheri N. 1971. "An investigation into the characteristics and sources of light emission at deep-sea hydrothermal vents." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/59093.

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Thesis (Ph.D.)--Joint Program in Oceanography (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences and the Woods Hole Oceanographic Institution), 2000.<br>Vita.<br>Includes bibliographical references (leaves 179-187).<br>A spectral camera (ALISS - Ambient Light Imaging and Spectral System) was used to image ambient light from high-temperature vents at 9°N East Pacific Rise and the Juan de Fuca Ridge during 1997 and 1998 Alvin dive cruises. ALISS is a low-light digital camera with custom-designed optics. A set of nine lenses, each covered by an individual

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20

Alroe, Joel. "Emission sources, cloud-relevant properties and variability of aerosol over the Southern and Pacific Oceans." Thesis, Queensland University of Technology, 2021. https://eprints.qut.edu.au/209152/1/Joel_Alroe_Thesis.pdf.

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Cloud-forming aerosol over the Southern Ocean currently contribute a major source of uncertainty in global atmospheric models. This work presents the seasonal changes in marine aerosol over the Southern Ocean, between the summer and winter months. The observations, obtained during two ship-based voyages south of Australia and New Zealand, revealed the impact of meteorology and marine biological productivity on the concentration and cloud-relevant properties of the marine aerosols. Comparison was made against an array of published empirical models for sea spray production to investigate their r

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21

Kukkonen, Jaakko. "Modelling source terms for the atmospheric dispersion of hazardous substances." Helsinki : Societas Scientiarum Fennica, 1990. http://catalog.hathitrust.org/api/volumes/oclc/57930643.html.

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22

Brewer, Tim M. "The glow discharge - a multifaceted optical emission source from solids analysis to metalloproteins /." Connect to this title online, 2007. http://etd.lib.clemson.edu/documents/1181251765/.

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23

Liška, Ivo. "Coulomb Interactions in Electron Beams in the Vicinity of a Schottky and Cold Field Emission Sources." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-233896.

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Dizertační práce se zabývá problematikou výpočtu vlivu coulombovských interakcí částic na parametry emitovaného elektronového svazku v blízkosti Schottkyho a studené katody. Práce poskytuje základní předhled o problematice, popisuje vytvořené modely emisních zdrojů a metodu simulace Monte Carlo. Představuje novou metodu generování vstupních dat, která klade větší důraz na přesnou simulaci emisního procesu. Pozornost je zde věnována zejména vlivu interakcí na energiovou šířku, velikost virtuálního zdroje a jas katody v závislosti na velikosti poloměru hrotu a emisním proudu. Sledováním vývoje e

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24

Sikdar, Anamika. "An objective method for the assessment of the impacts of odourous emissions from stationary sources." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ62284.pdf.

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25

Dazeley, Steven Ashton. "A search for very high energy gamma-ray emission from four galactic pulsars : a thesis submitted to the Department of Physics and Mathjematical Physics, University of Adelaide for the degree of Doctor of Philosophy." Title page, contents and abstract only, 1999. http://web4.library.adelaide.edu.au/theses/09PH/09phd277.pdf.

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26

Partridge, Bruce, Laura Bonavera, Marcos López-Caniego, et al. "Can CMB Surveys Help the AGN Community?" MDPI AG, 2017. http://hdl.handle.net/10150/625998.

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Contemporary projects to measure anisotropies in the cosmic microwave background (CMB) are now detecting hundreds to thousands of extragalactic radio sources, most of them blazars. As a member of a group of CMB scientists involved in the construction of catalogues of such sources and their analysis, I wish to point out the potential value of CMB surveys to studies of AGN jets and their polarization. Current CMB projects, for instance, reach mJy sensitivity, offer wide sky coverage, are blind and generally of uniform sensitivity across the sky (hence useful statistically), make essentially simu

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27

Clifford, Johanna Marie. "A 2009 mobile source emissions inventory of the University of Central Florida." Master's thesis, University of Central Florida, 2011. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4873.

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This thesis reports on the results of a mobile source emissions inventory for the University of Central Florida (UCF). For a large urban university, the majority of volatile organic compounds (VOC), oxides of nitrogen (NOsubscript x]), and carbon dioxide (CO[sub2]) emissions come from on-road sources: personal vehicles and campus shuttles carrying students, faculty, staff, and administrators to and from the university, as well as university business trips. In addition to emissions from daily commutes, non-road equipment such as lawnmowers, leaf blowers, small maintenance vehicles, and other su

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Mandaloufas, Melissa. "The use of sugarcane bagasse as power source, according to the clean development mechanism guidelines." Universidade de Taubaté, 2010. http://www.bdtd.unitau.br/tedesimplificado/tde_busca/arquivo.php?codArquivo=308.

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This work focuses on the actions sought by the authorities to minimize global climate problems that are currently changing the conditions of survival of the planet to mitigate emissions of greenhouse gases (GHG) in the atmosphere. First, it is addressed the Framework Convention to start the discussions on climate changes, then the creation of the Kyoto Protocol, which came, giving nations the opportunity to act, minimizing damage to the environment, thus enabling that developing countries work together through the Clean Development Mechanism (CDM) in creating new and more efficient technologie

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29

Muhamad, Bunnori Norazura. "Acoustic emission techniques for the damage assessment of reinforced concrete structures." Thesis, Cardiff University, 2008. http://orca.cf.ac.uk/54633/.

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30

Houston, Brian P. "The role of gamma-ray sources in relation to the observed diffuse emission and the cosmic ray origin problem." Thesis, Durham University, 1985. http://etheses.dur.ac.uk/7236/.

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Interpretation of the present gamma-ray data above 100 MeV is discussed in relation to cosmic ray interactions with the atomic and molecular hydrogen in the Galactic plane. The SAS II gamma-ray data are analysed for supportive evidence on the 2CG candidate sources identified from the COS B observations. The strongest sources are confirmed. There is good evidence to suggest that many of the weaker sources are not truly discrete. A Monte-Carlo analysis of the discrete source detection efficiencies suggests that many 2CG sources are unresolved giant molecular clouds, irradiated by the ambient cos

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31

Zhou, Jinpeng. "Chemical characterisation and source apportionment study of PM10 in the atmosphere of London." Thesis, King's College London (University of London), 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267484.

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32

Chowdhury, Muhammed Zohir. "Characterization of Fine Particle Air Pollution in the Indian Subcontinent." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5112.

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This thesis characterizes the mass and chemical composition of the fine particle air pollution over several cities in South Asia and quantifies how major sources impact the observed levels by using Chemical Mass Balance modeling with organic compounds as tracers. During February 1999, as part of the INDOEX program, a study was conducted to measure the size distribution and chemical composition of the fine particles in a remote island in Maldives off the coast of India. We found that the fine particle concentrations were comparable to those found in major cities in the United States, and were s

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33

Hall, Andrew Jensen. "Identification of Chlorinated Solvent Sources in the Indoor Air of Private Residences around Hill Air Force Base, Utah." DigitalCommons@USU, 2008. https://digitalcommons.usu.edu/etd/60.

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Volatile chlorinated solvents such as trichloroethylene (TCE), 1,2 dichloroethane (1,2 DCA), and perchloroethylene (PCE) have been identified in the indoor air of residences located near Hill Air Force Base (AFB), Utah. These vapors can originate from either volatilization of contaminates from shallow contaminated groundwater and transport into residences or from sources within the residence. The focus of the thesis was the development of a testing strategy for determining sources of TCE, 1,2 DCA, and PCE in the indoor air of residences near Hill AFB. Eight residences were selected for this st

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34

Hastings, Astley St John. "The potential of bio-energy crops to meet Europe's energy needs and reduce greenhouse emissions." Thesis, University of Aberdeen, 2009. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=26255.

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This thesis focuses on determining the potential of bio-energy crops to contribute to Europe’s future energy needs and to reduce future greenhouse gas emissions. This requires an end-to-end (seed to exhaust gas) analysis of the crop production and enabling technology in terms of energy use and greenhouse gas emissions. The starting point of this research was to consider which energy crops had the potential to grow in future European climate scenarios and to determine those for which models did not exist to make this prediction. <i>Miscanthus</i> was identified as a relatively new crop with 15

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Cheung, Soe Hoo. "Development of models for the atmospheric dispersion of odours from different source types." Thesis, Queen's University Belfast, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268226.

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36

Engle, Mark Alan. "The influence of tropospheric ozone, hydrothermal systems, and fires on atmospheric mercury emissions from natural sources /." abstract and full text PDF (free order & download UNR users only), 2005. http://0-wwwlib.umi.com.innopac.library.unr.edu/dissertations/fullcit/3209132.

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Thesis (Ph. D.)--University of Nevada, Reno, 2005.<br>"December 2005." Includes bibliographical references. Online version available on the World Wide Web. Library also has microfilm. Ann Arbor, Mich. : ProQuest Information and Learning Company, [2005]. 1 microfilm reel ; 35 mm.

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TURRION, R. GONZALEZ. "IDENTIFICATION AND QUANTIFICATION OF MOLECULAR MARKERS TO INDIVIDUATE THE CONTRIBUTION OF SOURCES IN PARTICULATE MATTER EMISSIONS." Doctoral thesis, Università degli Studi di Milano, 2015. http://hdl.handle.net/2434/331041.

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Nowadays, the atmospheric pollution entails a huge problem of public health and environmental conservation, increasing the necessity of creating new policies to regulate the emissions and to reduce the impact of this in the global climate. These characteristics make the aerosols the central topic of research in the current years. The composition of the particulate matter present in the atmosphere is so varied, being difficult to determine all the species present, and so, relate the pollution with precise sources. Aerosol particles are involved in several atmospheric processes, such as cloud f

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Akinshipe, Oladapo Bola. "The development of an ‘emission inventory tool’ for brickmaking clamp kilns." Diss., University of Pretoria, 2013. http://hdl.handle.net/2263/40846.

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An emission inventory tool for estimating SO2, NO2, and PM10 emissions from brick clamp kiln sites was developed from investigations performed on three representative South African clamp kiln sites in order to facilitate application for Atmospheric Emission Licenses (AELs) from these sources. The tool utilizes readily available site-specific parameters to generate emission factors for significant activities that emit the aforementioned pollutants. PM10 emission factors for significant processes were developed using empirical expressions from the Compilation of Air Pollutant Emission Fact

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Nygren, Anton. "Investigation of Emission Source Heights in FLEXPART 10.02 for the Wildfire in Pedrógão Grande, Portugal, 2017." Thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-383457.

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One of the worst wildfires in Portugal in 2017 on June17- 21 started at the central part of Pedrógão Grande and spread fast to the surrounding areas Góis, Pampilhosa da Serra and Arganil. The wildfire took 64 lives and a large smoke plume was observed. The interest in smoke plumes from wildfires is partly due to their emitting of greenhouse gases (CO2), a large source of aerosols, CO, oxides of nitrogen and other trace gases that can affect the air quality at local and regional scale. The regional scale can be affected because the smoke from wildfires can get elevated and be transported into t

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Jones, Derek. "Evaluation of Arrayed-Field Concentration Measurements and U. S. EPA-Regulatory Models for the Determination of Mixed-source Particulate Matter Emissions." DigitalCommons@USU, 2008. https://digitalcommons.usu.edu/etd/156.

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With the continued population growth and the blurring of the urban and rural interface, air quality impacts associated with agricultural particle-producing processes are becoming increasingly important. There is a lack of emission rate data from these source types and no prescribed measurement technique available to the agricultural and regulatory communities. One technique that has shown promise is combining field measurements with inverse modeling. This approach was used herein to examine particulate emissions from an almond harvesting operation, a cotton ginning facility, and comparative em

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Mainord, Jacinda L. "Investigation of Ambient Reactive Nitrogen Emissions Sources and Deposition in the Columbia River Gorge National Scenic Area." PDXScholar, 2017. https://pdxscholar.library.pdx.edu/open_access_etds/3621.

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Anthropogenic reactive nitrogen is emitted into the atmosphere from fossil fuel combustion (nitrogen oxides) and agricultural activities (nitrogen oxides and ammonia). Nitrogen oxide emissions have long been controlled for their role in ambient air pollution and human health effects. However, reactive nitrogen deposition is less understood even though it can play a significant role in altering biodiversity, impairing ecosystem and biogeochemical function and degrading cultural artifacts. Although nitrogen deposition is a natural part of biogeochemical cycling, many ecosystems across the United

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Douce, David Stewart. "Air quality assessment and the use of specific markers to apportion pollutants to source." Thesis, Sheffield Hallam University, 1998. http://shura.shu.ac.uk/19672/.

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The contributions of specific polluting sources to both indoor and outdoor atmospheric pollution are difficult to determine, as solid and gaseous products from different combustion sources are often similar. Sometimes, however, a marker compound can be identified that is unique to a pollution source (or at least not present in most other local combustion sources) and which will allow assessment of the contribution of that source to total atmospheric pollution. The aim of this study was to identify suitable marker compounds and methods for the apportionment (assessment of percentage contributio

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Pemberton, Robin Douglas. "The fate of naphthalene and n-alkylnaphthalenes during combustion, and an evaluation of the sources of these compounds in diesel exhaust emissions." Thesis, University of Plymouth, 1996. http://hdl.handle.net/10026.1/2684.

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The main objective of this research was to understand the fate of naphthalene and n-alkylnaphthalenes during diesel combustion, and an evaluation of their sources in diesel exhaust emissions. This was achieved by the use of a procedure which employed a [14C]radiolabelled PAH technique and a diesel enriched fuel technique (DEFT). The combustion of diesel fuel spiked with [14C]naphthalene has shown unequivocally that 0.5% of the naphthalene contained in diesel fuel survives combustion under the engine conditions studied (2500 rpm and 50 Nm). The survived naphthalene represented 22.8% of the tota

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Wenger, Daniela. "Endocrine-disrupting chemicals in the air : investigation of emission sources and ambient concentrations with reporter gene assays and chemical analysis /." Zürich : ETH, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=18004.

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45

Yukita, M., A. Ptak, A. E. Hornschemeier, et al. "Identification of the Hard X-Ray Source Dominating the E > 25 keV Emission of the Nearby Galaxy M31." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/623858.

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We report the identification of a bright hard X-ray source dominating the M31 bulge above 25 keV from a simultaneous NuSTAR-Swift observation. We find that this source is the counterpart to Swift J0042.6+4112, which was previously detected in the Swift BAT All-sky Hard X-ray Survey. This Swift BAT source had been suggested to be the combined emission from a number of point sources; our new observations have identified a single X-ray source from 0.5 to 50 keV as the counterpart for the first time. In the 0.5-10 keV band, the source had been classified as an X-ray Binary candidate in various Cha

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Lim, Guo Quan. "Evaluation of the Influence of Non-Conventional Sources of Emissions on Ambient Air Pollutant Concentrations in North Texas." Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc804841/.

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Emissions of air pollutants from non-conventional sources have been on the rise in the North Texas area over the past decade. These include primary pollutants such as volatile organic compound (VOC) and oxides of nitrogen (NOx) which also act as precursors in the formation of ozone. Most of these have been attributed to a significant increase in oil and gas production activities since 2000 within the Barnett Shale region adjacent to the Dallas-Fort Worth metroplex region. In this study, air quality concentrations measured at the Denton Airport and Dallas Hinton monitoring sites operated by t

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Wu, Weiliang. "The detection of incipient faults in small multi-cylinder diesel engines using multiple acoustic emission sensors." Thesis, Queensland University of Technology, 2014. https://eprints.qut.edu.au/65649/1/Weiliang_Wu_Thesis.pdf.

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This thesis investigates condition monitoring (CM) of diesel engines using acoustic emission (AE) techniques. The AE signals recorded from a small size diesel engine are mixtures of multiple sources from multiple cylinders. Thus, it is difficult to interpret the information conveyed in the signals for CM purposes. This thesis develops a series of practical signal processing techniques to overcome this problem. Various experimental studies conducted to assess the CM capabilities of AE analysis for diesel engines. A series of modified signal processing techniques were proposed. These techniques

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Panopoulou, Anastasia. "VOC source apportionment and emission inventory evaluation over the great Athens, comparison with other cities of the Mediterranean basin." Electronic Thesis or Diss., Ecole nationale supérieure Mines-Télécom Lille Douai, 2019. http://www.theses.fr/2019MTLD0024.

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Les COV (Composés Organiques Volatils) jouent un rôle majeur dans la problématique de pollution atmosphérique, puisqu’ils interviennent en tant que précurseurs des composés secondaires comme l’ozone troposphérique (O3) et l’Aérosols Organiques Secondaires (AOS) qui ont des impacts sur la santé et le climat. Afin de mettre en place des stratégies efficaces de réduction de la pollution de l’air, il est crucial de caractériser et quantifier la contribution des principales sources d’émission de COV.Le bassin méditerranéen constitue un environnement complexe, favorisant le développement des épisode

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Mizukami, Taku. "Study of Very High Energy Gamma-ray Emission from the Unidentified Source HESS J1614-518 with CANGAROO-III." 京都大学 (Kyoto University), 2013. http://hdl.handle.net/2433/175121.

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Katushkina, O. A., E. Quémerais, V. V. Izmodenov, R. Lallement та B. R. Sandel. "Voyager 1/UVS Lyman α Measurements at the Distant Heliosphere (90-130 AU): Unknown Source of Additional Emission". AMER GEOPHYSICAL UNION, 2017. http://hdl.handle.net/10150/626567.

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In this work, we present for the first time the Lyman alpha intensities measured by Voyager 1/UVS in 2003-2014 (at 90-130 AU from the Sun). During this period Voyager 1 measured the Lyman alpha emission in the outer heliosphere at an almost fixed direction close to the upwind (i.e."toward the interstellar flow). The data show an unexpected behavior in 2003-2009: the ratio of observed intensity to the solar Lyman alpha flux is almost constant. Numerical modeling of these data is performed in the frame of a state-of-the-art self-consistent kinetic-MHD model of the heliospheric interface. The mod

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