Rozprawy doktorskie na temat „Particle emissions”
Utwórz poprawne odniesienie w stylach APA, MLA, Chicago, Harvard i wielu innych
Sprawdź 50 najlepszych rozpraw doktorskich naukowych na temat „Particle emissions”.
Przycisk „Dodaj do bibliografii” jest dostępny obok każdej pracy w bibliografii. Użyj go – a my automatycznie utworzymy odniesienie bibliograficzne do wybranej pracy w stylu cytowania, którego potrzebujesz: APA, MLA, Harvard, Chicago, Vancouver itp.
Możesz również pobrać pełny tekst publikacji naukowej w formacie „.pdf” i przeczytać adnotację do pracy online, jeśli odpowiednie parametry są dostępne w metadanych.
Przeglądaj rozprawy doktorskie z różnych dziedzin i twórz odpowiednie bibliografie.
Johnson, Lynne Alison. "Modelling particle emissions from traffic flows". Thesis, Queensland University of Technology, 2000.
Znajdź pełny tekst źródłaWardoyo, Arinto Yudi. "Biomass burning : particle emissions, characteristics, and airborne measurements". Thesis, Queensland University of Technology, 2007. https://eprints.qut.edu.au/16492/1/Arinto_Wardoyo_Thesis.pdf.
Pełny tekst źródłaWardoyo, Arinto Yudi. "Biomass burning : particle emissions, characteristics, and airborne measurements". Queensland University of Technology, 2007. http://eprints.qut.edu.au/16492/.
Pełny tekst źródłaJohansson, Petter. "Oil-related Particle Emissions from Diesel Engines". Licentiate thesis, Stockholm : Maskinkonstruktion, Kungliga Tekniska högskolan, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9287.
Pełny tekst źródłaWang, Lina. "Quantification of particle emission characteristics and development of an emission model for use in transport microenvironments affected by traffic emissions". Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/46912/1/Lina_Wang_Thesis.pdf.
Pełny tekst źródłaVicente, Ana Margarida Proença. "Characterisation of gas and particle emissions from wildfires". Doctoral thesis, Universidade de Aveiro, 2012. http://hdl.handle.net/10773/10424.
Pełny tekst źródłaOs incêndios florestais são uma importante fonte de emissão de compostos gasosos e de aerossóis. Em Portugal, onde a maioria dos incêndios ocorre no norte e centro do país, os incêndios destroem todos os anos milhares de hectares, com importantes perdas em termos económicos, de vidas humanas e qualidade ambiental. As emissões podem alterar consideravelmente a química da atmosfera, degradar a qualidade do ar e alterar o clima. Contudo, a informação sobre as caraterísticas das emissões dos incêndios florestais nos países do Mediterrâneo é limitada. Tanto a nível nacional como internacional, existe um interesse crescente na elaboração de inventários de emissões e de regulamentos sobre as emissões de carbono para a atmosfera. Do ponto de vista atmosférico da monitorização atmosférica, os incêndios são considerados um desafio, dada a sua variabilidade temporal e espacial, sendo de esperar um aumento da sua frequência, dimensão e severidade, e também porque as estimativas de emissões dependem das caraterísticas dos biocombustíveis e da fase de combustão. O objetivo deste estudo foi quantificar e caraterizar as emissões de gases e aerossóis de alguns dos mais representativos incêndios florestais que ocorreram no centro de Portugal nos verões de 2009 e de 2010. Efetuou-se a colheita de amostras de gases e de duas frações de partículas (PM2.5 e PM2.5-10) nas plumas de fumo em sacos Tedlar e em filtros de quartzo acoplados a um amostrador de elevado volume, respetivamente. Os hidrocarbonetos totais (THC) e óxidos de carbono (CO e CO2) nas amostras gasosas foram analisados em instrumentos automáticos de ionização de chama e detetores não dispersivos de infravermelhos, respetivamente. Para algumas amostras, foram também quantificados alguns compostos de carbonilo após reamostragem do gás dos sacos Tedlar em cartuchos de sílica gel revestidos com 2,4-dinitrofenilhidrazina (DNPH), seguida de análise por cromatografia líquida de alta resolução. Nas partículas, analisou-se o carbono orgânico e elementar (técnica termo-óptica), iões solúveis em água (cromatografia iónica) e elementos (espectrometria de massa com plasma acoplado por indução ou análise instrumental por ativação com neutrões). A especiação orgânica foi obtida por cromatografia gasosa acoplada a espectrometria de massa após extração com recurso a vários solventes e separação dos extratos orgânicos em diversas classes de diferentes polaridades através do fracionamento com sílica gel. Os fatores de emissão do CO e do CO2 situaram-se nas gamas 52-482 e 822-1690 g kg-1 (base seca), mostrando, respetivamente, correlação negativa e positiva com a eficiência de combustão. Os fatores de emissão dos THC apresentaram valores mais elevados durante a fase de combustão latente sem chama, oscilando entre 0.33 e 334 g kg-1 (base seca). O composto orgânico volátil oxigenado mais abundante foi o acetaldeído com fatores de emissão que variaram desde 1.0 até 3.2 g kg-1 (base seca), seguido pelo formaldeído e o propionaldeído. Observou-se que as emissões destes compostos são promovidas durante a fase de combustão latente sem chama. Os fatores de emissão de PM2.5 e PM10 registaram valores entre 0.50-68 e 0.86-72 g kg-1 (base seca), respetivamente. A emissão de partículas finas e grosseiras é também promovida em condições de combustão lenta. As PM2.5 representaram cerca de 90% da massa de partículas PM10. A fração carbonosa das partículas amostradas em qualquer dos incêndios foi claramente dominada pelo carbono orgânico. Foi obtida uma ampla gama de rácios entre o carbono orgânico e o carbono elementar, dependendo das condições de combustão. Contudo, todos os rácios refletiram uma maior proporção de carbono orgânico em relação ao carbono elementar, típica das emissões de queima de biomassa. Os iões solúveis em água obtidos nas partículas da pluma de fumo contribuíram com valores até 3.9% da massa de partículas PM2.5 e 2.8% da massa de partículas de PM2.5-10. O potássio contribuiu com valores até 15 g mg-1 PM2.5 e 22 g mg-1 PM2.5-10, embora em massa absoluta estivesse maioritariamente presente nas partículas finas. Os rácios entre potássio e carbono elementar e entre potássio e carbono orgânico obtidos nas partículas da pluma de fumo enquadram-se na gama de valores relatados na literatura para emissões de queima de biomassa. Os elementos detetados nas amostras representaram, em média, valores até 1.2% e 12% da massa de PM2.5 e PM2.5-10, respetivamente. Partículas resultantes de uma combustão mais completa (valores elevados de CO2 e baixos de CO) foram caraterizadas por um elevado teor de constituintes inorgânicos e um menor conteúdo de matéria orgânica. Observou-se que a matéria orgânica particulada é composta principalmente por componentes fenólicos e produtos derivados, séries de compostos homólogos (alcanos, alcenos, ácidos alcanóicos e alcanóis), açúcares, biomarcadores esteróides e terpenóides, e hidrocarbonetos aromáticos policíclicos. O reteno, um biomarcador das emissões da queima de coníferas, foi o hidrocarboneto aromático dominante nas amostras das plumas de fumo amostradas durante a campanha que decorreu em 2009, devido ao predomínio de amostras colhidas em incêndios em florestas de pinheiros. O principal açúcar anidro, e sempre um dos compostos mais abundantes, foi o levoglucosano. O rácio levoglucosano/OC obtido nas partículas das plumas de fumo, em média, registaram valores desde 5.8 a 23 mg g-1 OC. Os rácios levoglucosano/manosano e levoglucosano/(manosano+galactosano) revelaram o predomínio de amostras provenientes da queima de coníferas. Tendo em conta que a estimativa das emissões dos incêndios florestais requer um conhecimento de fatores de emissão apropriados para cada biocombustível, a base de dados abrangente obtida neste estudo é potencialmente útil para atualizar os inventários de emissões. Tem vindo a ser observado que a fase de combustão latente sem chama, a qual pode ocorrer simultaneamente com a fase de chama e durar várias horas ou dias, pode contribuir para uma quantidade considerável de poluentes atmosféricos, pelo que os fatores de emissão correspondentes devem ser considerados no cálculo das emissões globais de incêndios florestais. Devido à falta de informação detalhada sobre perfis químicos de emissão, a base de dados obtida neste estudo pode também ser útil para a aplicação de modelos no recetor no sul da Europa.
Wildfires are an importante emission source of gaseous compounds and aerosol particles. In Portugal, where most fire events occur in northern and central areas of the country, wildfires destroy every year thousands of hectares, with important losses in terms of economic disruptions, human lives and environmental quality. Emissions can substantially perturb atmospheric chemistry, degrade air quality and alter weather and climate. However, limited data exist on the emission characteristics from this source in Mediterranean countries. At both national and international levels, there is an increasing focus on the establishment of emission inventories and regulations of regional carbon emissions to the atmosphere. From the standpoint of atmospherically-based carbon monitoring programs, fires are challenging because they tend to be extremely variable in intensity, space and time, they are expected to increase in number and severity in the future, and because emission estimates depend on biofuel characteristics and combustion phase. The aim of this study was to quantify and characterise the emissions of trace gases and aerosol particles from some of the most representative wildfires that occurred in central Portugal during the summers of 2009 and 2010. Gases and particles of two size fractions (PM2.5 and PM2.5-10) were collected from the smoke plumes in Tedlar bags and on quartz filters mounted on a high volume sampler, respectively. The gaseous compounds were subsequently analised for total hydrocarbons (THC) and carbon oxides (CO and CO2) in automatic instruments with flame ionisation and non-dispersive infrared detectors, respectively. For some smoke samples, carbonyls were also quantified after drawing air from the Tedlar bags through cartridges containing silica gel coated with 2,4-dinitrophenylhydrazine (DNPH) reagent and followed by analysis by high performace liquid chromatography. Particles were analysed for organic and elemental carbon (thermal-optical technique), water-soluble ions (ion chromatography) and trace elements (inductively coupled plasma mass spectrometry or instrumental neutron activation analysis). The organic speciation was obtained by gas chromatography coupled to mass spectrometry after multi-solvent extraction and separation of the organic extracts into several classes of different polarities by flash chromatography on silica gel. The CO and CO2 emission factors were in the ranges 52-482 and 822-1690 g kg-1 (dry basis), showing, respectively, negative and positive correlations with the combustion efficiency. The THC emission factors were higher during smouldering conditions with values ranging between 0.33 and 334 g kg-1 (dry basis). The most abundant oxygenated volatile organic compound measured was acetaldehyde with emission factors ranging from 1.0 to 3.2 g kg-1 (dry basis), followed by formaldehyde and propionaldehyde. The emission of these compounds were enhanced during the smouldering phase. PM2.5 and PM10 emission factors were in the ranges 0.50-68 and 0.86-72 g kg-1 (dry basis), respectively. The emission of fine and coarse particles was promoted by smouldering combustion conditions. PM2.5 particles contributed to around 90% of the PM10 mass. The carbonaceous fraction of smoke particulate samples from any of the fires was clearly dominated by organic carbon. A wide range of organic carbon-to-elemental carbon concentration ratios was obtained, depending on the combustion conditions. However, all the ratios reflected a much higher proportion of organic carbon in relation to elemental carbon, typical of biomass burning emissions. The water-soluble ions obtained in smoke particles contributed with values up to 3.9% of the PM2.5 and 2.8% of the PM2.5-10 particles. Potassium contributed up to 15 g mg-1 PM2.5 and 22 g mg-1 PM2.5-10, although in absolute mass it was overwhelmingly present in fine particles. The potassium-to-elemental carbon and potassium-to-organic carbon ratios obtained in smoke particles were in accordance with those reported in the literature for biomass burning sources. Trace elements detected in smoke samples represented, on average, up to 1.2% and 12% of the PM2.5 and PM2.5-10 mass, respectively. Particles from a more complete combustion (higher CO2 and lower CO values) were characterised by a higher content of inorganic constituents and a lower organic content. The particulate organic matter was mainly composed of phenolic compounds and their alteration products, homologous series (n-alkanes, n-alkenes, n-alkanoic acids and n-alkanols), sugar constituents, steroid and terpenoid biomarkers, and polycyclic aromatic hydrocarbons. Retene, a biomarker of softwood smoke, was the dominant aromatic hydrocarbon in smoke samples collected during the 2009 campaign, due to a predominance of samples from wildfires in pine forests. The major anhydrosugar, and always one of the most abundant compounds, was levoglucosan. The levoglucosan/OC ratio obtained in the smoke particles, on average, ranged from 5.8 to 23 mg g-1 OC. The levoglucosan-to-mannosan and the levoglucosan-to-mannosan plus galactosan ratios determined reveal a predominance of samples from softwood combustion. Since estimation of wildfire emissions requires knowledge of fuel-appropriate emissions factors, the comprehensive database obtained in this study is potentially useful to update the current emission inventories. It has been observed that the smouldering phase, which can occur simultaneously with the flaming front and continue for several hours to days, may contribute to significant amounts of atmospheric pollutants and the corresponding emission factors should be considered when calculating the global wildfire emissions. Due to the lack of detailed emission profiles, the databases obtained in this study can also be very helpful for receptor modelling in southern Europe.
Petzold, Andreas. "Particle emissions from aviation : microphysics, chemistry, and climate impact /". Köln : DLR, 2006. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=015380591&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Pełny tekst źródłaHitchins, Jane. "Dispersion of particles from vehicle emissions". Thesis, Queensland University of Technology, 2001.
Znajdź pełny tekst źródłaMazaheri, Mandana. "Investigation into submicrometer particle and gaseous emissions from airport ground running procedures". Thesis, Queensland University of Technology, 2009. https://eprints.qut.edu.au/29183/1/Mandana_Mazaheri_Citation.pdf.
Pełny tekst źródłaMazaheri, Mandana. "Investigation into submicrometer particle and gaseous emissions from airport ground running procedures". Queensland University of Technology, 2009. http://eprints.qut.edu.au/29183/.
Pełny tekst źródłaWang, Hao. "Formation mechanisms of secondary organic aerosols in relation to laser printer emissions". Thesis, Queensland University of Technology, 2011. https://eprints.qut.edu.au/47442/1/Hao_Wang_Thesis.pdf.
Pełny tekst źródłaKeogh, Diane Underwood. "Development of a particle number and particle mass emissions inventory for an urban fleet : a study in South-East Queensland". Thesis, Queensland University of Technology, 2009. https://eprints.qut.edu.au/30297/1/Diane_Keogh_Thesis.pdf.
Pełny tekst źródłaKeogh, Diane Underwood. "Development of a particle number and particle mass emissions inventory for an urban fleet : a study in South-East Queensland". Queensland University of Technology, 2009. http://eprints.qut.edu.au/30297/.
Pełny tekst źródłaChowdhury, Muhammed Zohir. "Characterization of Fine Particle Air Pollution in the Indian Subcontinent". Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5112.
Pełny tekst źródłaWhitcombe, Joshua Matthew, i n/a. "Study of Catalyst Particle Emissions From a Fluidized Catalytic Cracker Unit". Griffith University. School of Environmental Engineering, 2003. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20031003.152200.
Pełny tekst źródłaHuang, Guannan. "Evaluation of airborne particle emissions from commercial products containing carbon nanotubes". Thesis, University of Iowa, 2012. https://ir.uiowa.edu/etd/2899.
Pełny tekst źródłaPuchakayala, Madhu Babu. "Mercury emission behavior during isolated coal particle combustion". [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1153.
Pełny tekst źródłaRojas, Néstor Y. "Diesel exhaust system influences on transient particulate emissions and particle size distribution". Thesis, University of Leeds, 2001. http://etheses.whiterose.ac.uk/2292/.
Pełny tekst źródłaAhmed, Sauda. "Modeling of Ultrafine Particle Emissions and Ambient Levels for the Near Roadside Environment". PDXScholar, 2017. https://pdxscholar.library.pdx.edu/open_access_etds/3506.
Pełny tekst źródłaRahman, Md Mostafizur. "Influences of biodiesel chemical compositions and physical properties on engine exhaust particle emissions". Thesis, Queensland University of Technology, 2015. https://eprints.qut.edu.au/82754/8/Md_Rahman_Thesis.pdf.
Pełny tekst źródłaFeralio, Tyler Samuel. "The Effect Of Biodiesel Blends On Particle Number Emissions From A Light Duty Diesel Engine". ScholarWorks @ UVM, 2015. http://scholarworks.uvm.edu/graddis/400.
Pełny tekst źródłaBabaie, Meisam. "Reduction of diesel engine exhaust emissions using non-thermal plasma technology". Thesis, Queensland University of Technology, 2015. https://eprints.qut.edu.au/81593/1/Meisam_Babaie_Thesis.pdf.
Pełny tekst źródłaHirst, Edwin. "Airborne particle shape and size classification from spatial light scattering profiles". Thesis, University of Hertfordshire, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332653.
Pełny tekst źródłaMejia, Jaime F. "Long-term trends in fine particle number concentrations in the urban atmosphere of Brisbane : the relevance of traffic emissions and new particle formation". Thesis, Queensland University of Technology, 2008. https://eprints.qut.edu.au/26283/1/Jaime_Mejia_Thesis.pdf.
Pełny tekst źródłaMejia, Jaime F. "Long-term trends in fine particle number concentrations in the urban atmosphere of Brisbane : the relevance of traffic emissions and new particle formation". Queensland University of Technology, 2008. http://eprints.qut.edu.au/26283/.
Pełny tekst źródłaMcGarry, Peter D. "Nanoparticles in the workplace environment: Emissions, transport, dynamics and effectiveness of control". Thesis, Queensland University of Technology, 2016. https://eprints.qut.edu.au/96013/1/Peter_McGarry_Thesis.pdf.
Pełny tekst źródłaBertsch, Markus [Verfasser], i T. [Akademischer Betreuer] Koch. "Experimental Investigations on Particle Number Emissions from GDI Engines / Markus Bertsch ; Betreuer: T. Koch". Karlsruhe : KIT-Bibliothek, 2016. http://d-nb.info/1123146128/34.
Pełny tekst źródłaSilver, David J. "Occupational exposure to ultrafine particles and polycyclic aromatic hydrocarbons from candle emissions". [Tampa, Fla] : University of South Florida, 2005. http://purl.fcla.edu/usf/dc/et/SFE0001426.
Pełny tekst źródłaLeduc, Sylvain. "Study of the reduction of particle emissions and borate black liquor gasification in bioenergy systems /". Luleå, 2004. http://epubl.luth.se/1402-1757/2004/50.
Pełny tekst źródłaFagerström, Jonathan. "Fine particle emissions and slag formation in fixed-bed biomass combustion : aspects of fuel engineering". Doctoral thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-102687.
Pełny tekst źródłaSurawski, Nicholas C. "An investigation of gaseous and particulate emissions from compression ignition engines operated with alternative fuels, injection technologies, and combustion strategies". Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/54194/1/Surawski_Thesis_2011.pdf.
Pełny tekst źródłaAlemani, Mattia. "Particle emissions from car brakes : The influence of contact conditions on the pad-to-rotor interface". Doctoral thesis, KTH, Tribologi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-208701.
Pełny tekst źródłaPå grund av deras negativa hälsoeffekter har partikel emissioner reglerats i över tre årtionden. Bromsslitagepartiklar är den viktigaste icke-avgaskällan, men nuvarande kunskaper är huvudsakligen begränsade till observationsstudier. Avhandlingen syftar till att undersöka förhållandena mellan bromssystemets kontaktförhållanden och de relaterade utsläppen på modellskala. Validera resultaten på komponentnivå och förstå i vilken utsträckning de är betydande i full skala. Papper A undersöker påverkan av nominellt kontakttryck i en modellskala. Resultat visar att högre tryck motsvarar högre utsläpp. Papper B undersöker påverkan av det nominella kontakttrycket, för olika friktionsmaterial, i modellskala. En temperaturtröskel, för en emissionsökning identifieras. Papper C undersöker partikelegenskaper och slitagemekanismer för olika nominella kontakttryck, i en modellskala. Resultat visar ett förbättrat triboskikt vid högre trycknivåer. Papper D undersöker påverkan av bromssystemets förhållanden på utsläpp i en modellskala. Resultat visar att friktionskraften är den viktigaste parametern. En övergångstemperatur oberoende av kontaktförhållandet identifieras. Papper E undersöker likheter som uppträder på komponentskala och modellskala när det gäller emissioner. Resultatet visar en lovande korrelation, och möjligheten att använda en pinne-på-skiva-tribometer för FoU-aktiviteter. Papper F undersöker analogier som förekommer på en komponentskala och en modellskala, vad gäller friktionsprestanda, friktionsyta och kemisk sammansättning. Resultat visar liknande fenomen som förekommer för de två testskalorna. Papper G analyserar verkliga bromssystem arbetsförhållanden i en stadsmiljö som definierar, med hjälp av en tröghetsdyno bänk, de relaterade utsläppen. Resultatet visar utsläppsfaktorer som är förenliga med EURO6 och EURO2-reglerna, i fråga om antal respektive massa.
QC 20170808
REBRAKE Project
Mathissen, Marcel [Verfasser]. "Development of experimental methods to investigate non-exhaust particle emissions from a light duty vehicle / Marcel Mathissen". Wuppertal : Universitätsbibliothek Wuppertal, 2012. http://d-nb.info/1029857660/34.
Pełny tekst źródłaGarcìa, Lòpez Natxo. "Fine particle emissions from biomass cookstoves : Evaluation of a new laboratory setup and comparison of three appliances". Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-136556.
Pełny tekst źródłaConger, Matthew Beach. "Characterization Of Real-World Particle Number Emissions During Re-Ignition Events From A 2010 Light-Duty Hybrid-Electric Vehicle". ScholarWorks @ UVM, 2015. http://scholarworks.uvm.edu/graddis/510.
Pełny tekst źródłaGuo, Li. "Measurement and control of particulate emissions from cattle feedlots in Kansas". Diss., Kansas State University, 2011. http://hdl.handle.net/2097/8549.
Pełny tekst źródłaDepartment of Biological & Agricultural Engineering
Ronaldo G. Maghirang
Emissions of particulate matter (PM) are an increasing concern for large open beef cattle feedlots. Research is needed to develop science-based information on PM emissions and abatement measures for mitigating those emissions. This research was conducted to (1) measure PM concentrations emitted from large cattle feedlots, (2) compare different samplers for measuring concentrations of PM with equivalent aerodynamic diameter of 10 µm or less (PM10), (3) evaluate the relative effectiveness of pen surface treatments in reducing PM10 emissions, and (4) predict PM control efficiency of vegetative barriers. Concentrations of PM with equivalent aerodynamic diameter of 2.5 µm or less (PM2.5), PM10, and total suspended particulates (TSP) upwind and downwind of two large cattle feedlots (KS1, KS2) in Kansas were measured with gravimetric samplers. The downwind and net concentrations generally decreased with increasing water content (WC) of the pen surface; for effective control of PM emissions from feedlots, it appears that pen surface WC should be at least 20% (wet basis). Three types of samplers for measuring PM10 concentrations in feedlots KS1 and KS2 were compared: Tapered Element Oscillating Microbalance™ (TEOM), high-volume (HV), and low-volume (LV) PM10 samplers. Measured PM10 concentration was generally largest with the TEOM PM10 sampler and smallest with the LV PM10 sampler. A laboratory apparatus was developed for measuring the PM10 emission potential of pen surfaces as affected by surface treatments. The apparatus was equipped with a simulated pen surface, mock cattle hooves that moved horizontally across the pen surface, and PM10 samplers that collected emitted PM10. Of the surface treatments evaluated, application of water (6.4 mm) and hay (723 g/m2) exhibited the greatest percentage reduction in PM10 emission potential (69% and 77%, respectively) compared with the untreated manure layer. Computational fluid dynamics (CFD) was applied to predict airflow and particle collection by a row of trees (2.2 m high × 1.6 m wide). Predicted particle collection efficiencies generally agreed with published data and ranged from less than 1% for 0.875-µm particles to approximately 32% for 15-µm particles.
Nilsson, Daniel, Fredrik Rosenqvist i Erik Blomgren. "Bränsleoptimering av befintliga brikettpannor". Thesis, Växjö University, School of Technology and Design, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:vxu:diva-5284.
Pełny tekst źródłaIntresset för biobränsleproducerad energi har ökat i takt med att kunderna blivit mer miljömedvetna. På grund av detta har efterfrågan på briketter ökat samtidigt som träindustrin har haft det svårt i en sviktande konjunktur. Därför har ett examensarbete utförts i samarbete med E.ON Värme Sverige AB där undersökningar på bränslebyte i pannor avsedda för torra bränslen till fuktigare, stamvedflis har utfört.
För denna undersökning har begränsningar införts på övre och undre effekt i form av uppehållstid och slutförbränningstemperatur. Intervallen är enbart beräknade på stamvedflis med 30 och 40 % fukthalt.
Undersökning visar att det går bra att elda stamvedsflis i briketteldade pannor utan att emissionerna ökar så pass mycket att villkoren för anläggningarna överskrids om lasten hålls inom vissa intervall. Det möjliga effektintervallet ökar med minskad fukthalt på bränslet.
Undersökningen har visat att det är bränslets kvalitet som är den mest begränsande faktorn.
The interest in bioenergy has increased with increased environmental awareness. The increasing demand on biofuels and the decreasing availability of the rawmaterials for making refined biofuels such as wood briquettes and wood pellets have caused the prices of these biofuels to increase. This report is performed in collaboration with E.ON Värme Sverige AB and its purpose is to investigate the possibilities for a change of fuels in existing boilers designed for refined biofuels, from wood briquettes to wood chips.
To be able to calculate a power interval where it would be possible to use wood chips with moisture contents of 30 and 40% by weight respectively, we had to make some assumptions regarding maximum flue gas flow, minimum retention time and the lowest temperature regarding complete combustion of CO.
Our calculations show that it is possible to use woodchips with a moisture content of 30 % w/w without any significant problems in all our boilers. When the moisture content is increased to 40 % w/w the interval for possible power output becomes more narrow. The amount of dust that is being emitted from the boilers does not exceed the limits regulated by environmental law, unless the thermal load of the boiler is too high.
The single most important factor for a successful change of fuel from wood briquettes to woodchips is that the fuel quality is good.
Sadiktsis, Ioannis. "Traffic related air pollution with emphasis on particle associated polycyclic aromatic hydrocarbons : Tire wear and biodiesel exhaust emissions". Doctoral thesis, Stockholms universitet, Institutionen för miljövetenskap och analytisk kemi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-128859.
Pełny tekst źródłaAt the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 5: Manuscript.
Johnson, Ben T. "Experimental analysis of crankcase oil aerosol generation and control". Thesis, Loughborough University, 2012. https://dspace.lboro.ac.uk/2134/10968.
Pełny tekst źródłaBernemyr, Hanna. "Volatility and number measurement of diesel engine exhaust particles". Doctoral thesis, Stockholm : Maskinkonstruktion, Kungliga Tekniska högskolan, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4482.
Pełny tekst źródłaHelmbrecht, Stephan. "Partikeltherapie-PET – Optimierung der Datenverarbeitung für die klinische Anwendung". Forschungszentrum Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-161261.
Pełny tekst źródłaDunshee, James Robert. "Evaluation Of The Engine Exhaust Particle Sizer (eeps) For Real-Time Measurements Of Diesel And Biodiesel Exhaust Particulate Matter". ScholarWorks @ UVM, 2016. http://scholarworks.uvm.edu/graddis/547.
Pełny tekst źródłaRohling, Heide. "Simulation studies for the in-vivo dose verification of particle therapy". Helmholtz-Zentrum Dresden - Rossendorf, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-175213.
Pełny tekst źródłaKarlsson, Hanna. "Particularly harmful particles? : a study of airborne particles with a focus on genotoxicity and oxidative stress /". Stockholm, 2006. http://diss.kib.ki.se/2006/91-7140-972-6/.
Pełny tekst źródłaGramotnev, Galina. "Analysis of dispersion and propagation of fine and ultra fine particle aerosols from a busy road". Thesis, Queensland University of Technology, 2007. https://eprints.qut.edu.au/16338/1/Galina_Gramotnev_Thesis.pdf.
Pełny tekst źródłaGramotnev, Galina. "Analysis of dispersion and propagation of fine and ultra fine particle aerosols from a busy road". Queensland University of Technology, 2007. http://eprints.qut.edu.au/16338/.
Pełny tekst źródłaFarwick, zum Hagen Ferdinand H. [Verfasser]. "Investigation of Brake Wear Particle Emissions on the Dynamometer and the Vehicle under Real-Driving Simulation / Ferdinand H. Farwick zum Hagen". Wuppertal : Universitätsbibliothek Wuppertal, 2020. http://d-nb.info/121438983X/34.
Pełny tekst źródłaGkatzelis, Georgios [Verfasser], Andreas [Gutachter] Hofzumahaus i Astrid [Gutachter] Kiendler-Scharr. "Gas-to-Particle Partitioning of Major Oxidation Products from Monoterpenes and Real Plant Emissions / Georgios Gkatzelis ; Gutachter: Andreas Hofzumahaus, Astrid Kiendler-Scharr". Köln : Universitäts- und Stadtbibliothek Köln, 2017. http://d-nb.info/1161223304/34.
Pełny tekst źródłaGonzales, Howell B. "Cattle feedlot dust – laser diffraction analysis of size distribution and estimation of emissions from unpaved roads and wind erosion". Thesis, Kansas State University, 2010. http://hdl.handle.net/2097/7041.
Pełny tekst źródłaDepartment of Biological & Agricultural Engineering
Ronaldo G. Maghirang
Large cattle feedlots emit considerable amounts of particulate matter (PM), including TSP (total suspended particulates), PM[subscript]10 (PM with equivalent aerodynamic diameter of 10 μm or less), and PM[subscript]2.5 (PM with equivalent aerodynamic diameter of 2.5 μm or less). Particulate emissions result from pen surface disturbance by cattle hoof action, vehicle traffic on unpaved roads and alleyways, and wind erosion. Research is needed to determine concentrations of various size fractions, size distribution, and emission rates from various sources in feedlots. This research was conducted to measure particle size distribution using laser diffraction method and estimate emissions from unpaved roads and wind erosion. Particle size distribution and concentrations of PM[subscript]10 and PM[subscript]2.5 at a commercial cattle feedlot in Kansas (Feedlot 1) were measured over a 2-yr period. The feedlot had a capacity of 30,000 head and total pen area of 50 ha and was equipped with a sprinkler system for dust control. Collocated low-volume samplers for TSP, PM[subscript]10, and PM[subscript]2.5 were used to measure concentrations of TSP, PM[subscript]10, and PM[subscript]2.5 at the upwind and downwind edges of the feedlot. Dust samples that were collected by TSP samplers were analyzed with a laser diffraction analyzer to determine particle size distribution. Particle size distribution at the downwind edge of the feedlot was also measured with micro-orifice uniform deposit impactor (MOUDI). The laser diffraction method and MOUDI did not differ significantly in mean geometric mean diameter (13.7 vs. 13.0 μm) but differed in mean geometric standard deviation (2.9 vs. 2.3). From laser diffraction and TSP data, PM[subscript]10 and PM[subscript]2.5 concentrations were also calculated and were not significantly different from those measured by low-volume PM[subscript]10 and PM[subscript]2.5 samplers (122 vs. 131 μg/m[superscript]3 for PM[subscript]10; 26 vs. 35 μg/m[superscript]3 for PM[subscript]2.5). Both PM[subscript]10 and PM[subscript]2.5 fractions decreased as pen surface moisture contents increased, while the PM[subscript]2.5/PM[subscript]10 ratio did not change much with pen surface moisture content. Published emission models were used to estimate PM[subscript]10 emissions from unpaved roads and wind erosion at Feedlot 1 and another nearby feedlot (Feedlot 2). Feedlot 2 had a capacity of 30,000 head, total pen surface area of 59 ha, and used water trucks for dust control. Estimated PM[subscript]10 emissions from unpaved roads and wind erosion were less than 20% of total PM[subscript]10 emissions obtained from inverse dispersion modeling. Further research is needed to establish the applicability of published emission estimation models for cattle feedlots.
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.
Pełny tekst źródła