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Rozprawy doktorskie na temat „Particle Size Distribution Analysis”

Autor: Grafiati

Data publikacji: 3 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

Patel, Ketan Shantilal. "Vibro-spring particle size distribution analyser." Thesis, University College London (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.252097.

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Wanogho, S. O. "The forensic analysis of soils with particular reference to particle size distribution analysis." Thesis, University of Strathclyde, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381113.

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Svoboda, Svetozár. "Vyhodnocení kontaminace pracovního prostředí aerosoly řezných kapalin při soustružení kovů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318769.

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The thesis deals with the contamination of the workspace with a liquid aerosol, which is generated by scattering and evaporation of the cooling fluid. Cooling fluid are primarily intended to lubricate, cool and clean the tool and the workpiece, but the unwanted side effect is the formation of a liquid aerosol that holds in the air of the workspace. In such a contaminated work environment, the operator is exposed to a certain dose of a liquid aerosol that causes dermatological and respiratory problems. The topic of the thesis was to find out the number of particles of liquid aerosol that arises

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Wangsa-Wirawan, Norbertus Djajasantosa. "Physicochemical properties of protein inclusion bodies." Title page, contents and introduction only, 1999. http://web4.library.adelaide.edu.au/theses/09PH/09phw2465.pdf.

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Bibliography: leaves 182-198. Improvements in the current production system of inclusion bodies and the downstream processing sequence are essential to maintain a competitive advantage in the market place. Optimisation of fermentation is considered to improve production yield; then flotation as a possible inclusion body recovery method.

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Dalecky, Amanda Lee. "Particle Size Distribution Analysis of a Mining-Impacted Gravel-Bed Stream in Ohio Using a Hybrid Sediment Sampling Technique." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/35721.

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As part of a risk assessment study of the Leading Creek Watershed in Ohio, a prior Virginia Tech researcher collected pavement and subpavement sediment samples at 17 sites using the hybrid areal sampling technique with a clay adhesive. The watershed, which is heavily impacted by mining and agricultural activities, suffers from low pH, high concentrations of metals and sediment in the water column, and excessively silted streambeds. The current work presents the results of the particle size analyses performed on the hybrid samples in the context of evaluating the effectiveness of the techniqu

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Guidi, Lionel. "Particle flux transformation in the mesopelagic water column: process analysis and global balance." Diss., Texas A&M University, 2008. http://hdl.handle.net/1969.1/85946.

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Marine aggregates are an important means of carbon transfers downwards to the deep ocean as well as an important nutritional source for benthic organism communities that are the ultimate recipients of the flux. During these last 10 years, data on size distribution of particulate matter have been collected in different oceanic provinces using an Underwater Video Profiler. The cruise data include simultaneous analyses of particle size distributions as well as additional physical and biological measurements of water properties through the water column. First, size distributions of large aggregate

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7

Rahman, Md Mahmudur. "Investigations into source contributions and spatial distribution of airborne pollutants in an urban airshed by the development and application of advanced statistical models." Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/108952/2/Md_Mahmudur_Rahman_Thesis.pdf.

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This thesis developed novel statistical modelling methods to quantify airborne gaseous and particle concentrations and their source contribution in an urban area; in particular, developed a novel Land Use Regression (LUR) model for predicting the daily average concentration of airborne gaseous concentrations, a novel Bayesian modelling approach to quantify airborne ultrafine particle source contribution, and a geostatistical modelling approach for quantifying spatial concentrations of airborne pollutants. Besides, nighttime new particle formation mechanism and their physical properties have be

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8

Mazzini, Martina. "Analysis of the aerosol number size distribution variability and characterization of new particle formation events at Monte Cimone GAW global station." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23221/.

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The aim of this thesis is to obtain long-term information on aerosol number size distribution and new particle formation at the Mt. Cimone GAW global station (CMN, 2165 m a.s.l.) to better assess how aerosols impact on Earth system. The size distribution of particles ranging from 9nm to 500nm was continuously observed with a DMPS from November 2005 to July 2013 in the framework of EUSAAR and ACTRIS projects. Size distribution and number concentration are studied at different time scales, together with occurrences of new particle formation (NPF). CMN typical aerosol number size distribution is

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9

Attili, Bassam Saleem. "Particle size distribution and qualitative/quantitative analysis of trace metals in the combustion gas and fly ash of coal/refuse derived fuel." Thesis, University of North Texas, 1991. https://digital.library.unt.edu/ark:/67531/metadc332571/.

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This work includes two different areas of research. Both areas are related to the combustion of the binder-enhanced densified refuse derived fuel (bdRDF) with high sulfur coal and examining trace elements. The first area of this work involved studying the trace metals in the combustion gas of bdRDF/coal blend and the effect of the binder, CA(OH)2, on reducing the trace elements emissions. The second area of work involved studying the trace elements in the fly ash and the effect of the dRDF and the binder of trace metals.

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10

Dutson, Andrew S. "A Multifaceted Sedimentological Analysis on Hobble Creek." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2625.

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Due to the endangerment of the June sucker (Chasmistes liorus), the lower two miles of Hobble Creek, Utah has been the focus of several restoration efforts. The portion of the creek between Interstate 15 and Utah Lake has been moved into a more "natural" channel and efforts are now being made to expand restoration to the east side of the freeway. This thesis reports on three different parts of a sedimentological analysis performed on Hobble Creek. The first part is a data set that contains information about the particle size distribution on the bed of Hobble Creek between 400 W and Interstate

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Parker, Eleanor Jane. "An assessment of environmental magnetics and particle size distribution analysis as proxies for variations in the intensity of the East Asian monsoon." Thesis, University of Liverpool, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366651.

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12

Gonzales, 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.

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Master of Science<br>Department of Biological & Agricultural Engineering<br>Ronaldo G. Maghirang<br>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 fract

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13

Ehrenhofer, Adrian, and Thomas Wallmersperger. "Active hydrogel composite membranes for the analysis of cell size distributions." SPIE, 2019. https://tud.qucosa.de/id/qucosa%3A74237.

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Active membranes with switchable pores that are based on hydrogels can be used to measure the cell size distribution in blood samples. The system investigated in the present research is based on a polyethylene terephthalate (PET) membrane that is surface polymerized with poly (N-isopropyl acrylamide) (PNiPAAm) to form active pores of arbitrary geometry. The PET membrane provides the functionality of a backbone for mechanical rigidity, while the soft PNiPAAm hydrogel forms the active pores. Modeling and simulation of the active hydrogel behavior proved to adequately predict the opening and clos

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14

Nabeel, Muhammad. "A study of micro-particles in the dust and melt at different stages of iron and steelmaking." Doctoral thesis, KTH, Tillämpad processmetallurgi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-196805.

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The dust particles generated due to mechanical wear of iron ore pellets and clusters formed in molten stainless steel alloyed with rare earth metals (REM) are considered in this study. Firstly, the influence of the characteristics of iron ore pellets, applied load on a pellet bed and partial reduction of the pellets on the size distribution of the generated dust was investigated. Secondly, REM clusters are investigated to evaluate the size distribution of the clusters. Also, an extreme value distribution (EVD) analysis has been applied for the observed REM clusters. The large sized pellets sho

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15

Bracci, Alessandro. "Analysis of precipitation from ground observations over the Antarctic coast." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16875/.

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The primary mass input of the Antarctic ice sheet is represented by snow precipitation. Despite of their crucial role, the estimates of precipitation over Antarctica are sparse and characterized by large uncertainties. Recently, the Italian Mario Zucchelli station (MZS) at Terra Nova Bay was equipped with instruments for monitoring precipitation. This thesis is part of the APP-PNRA project (Antarctic precipitation properties from ground-based instruments), whose object is to set up an observatory to characterize precipitation at MZS. The present study was focused on the evaluation of the resp

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16

Majd, Faghihi Ehsan. "Quantitative assessment and characterisation of airborne engineered nanoparticles." Thesis, Queensland University of Technology, 2015. https://eprints.qut.edu.au/84524/4/Ehsan%20Majd%20Faghihi%20Thesis.pdf.

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This research has brought new scientific insight into the characteristics of airborne engineered nanoparticles, which is essential when considering their effects on human health. The key findings of the work were a harmonised and traceable protocol for the size characterisation of engineered nanoparticles, and quantification of their emissions and dynamics in workplaces. The novelty of this project is in coupling a comprehensive experimental measurement approach with innovative and effective data interpretation. Also, for the first time, the existence of a general trend in the emission of nano

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Babaie, 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.

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Non-thermal plasma (NTP) is a promising candidate for controlling engine exhaust emissions. Plasma is known as the fourth state of matter, where both electrons and positive ions co-exist. Both gaseous and particle emissions of diesel exhaust undergo chemical changes when they are exposed to plasma. In this project diesel particulate matter (DPM) mitigation from the actual diesel exhaust by using NTP technology has been studied. The effect of plasma, not only on PM mass but also on PM size distribution, physico-chemical structure of PM and PM removal mechanisms, has been investigated. It was fo

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18

Ringuet, Johany. "Dérivés oxygénés et nitrés des hydrocarbures aromatiques polycycliques (OHAP/NHAP) en phase particulaire : granulométrie et devenir dans l’atmosphère (formation/dégradation)." Thesis, Bordeaux 1, 2012. http://www.theses.fr/2012BOR14504/document.

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Les Hydrocarbures Aromatiques Polycycliques (HAP) sont des polluants dont la concentration est réglementée dans l’air ambiant, en raison de leurs caractères cancérigène et/ou mutagène. Ces composés, émis lors de combustions incomplètes, peuvent réagir dans l’atmosphère avec les principaux oxydants atmosphériques pour former des dérivés oxygénés (OHAP) et nitrés (NHAP), dont la toxicité est potentiellement encore plus importante. Dans ce contexte, ce travail a été réalisé par la combinaison de deux approches complémentaires : études de réactivité en atmosphère contrôlée et études de terrain, af

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19

Momoli, Renata Santos. "Caracterização e distribuição espacial dos sedimentos depositados numa zona ripária reflorestada." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/11/11140/tde-06122006-125924/.

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As atividades agrícolas no Estado de São Paulo, foram responsáveis pela supressão da cobertura vegetal original do solo e, sua conseqüente degradação. A vegetação nativa foi gradativamente substituída por culturas como café, pastagem, citros e cana-de-açúcar, durante séculos de ocupação e uso da terra. A recomposição da cobertura florestal auxilia na prevenção da erosão do solo e na redução dos impactos causados. A floresta ripária retém os sedimentos resultantes do desprendimento do solo à montante e transportados pela enxurrada. A deposição de sedimentos na zona ripária está relacionada à pl

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20

Nazih, Abdelhamid. "Applications de la spectroscopie par corrélation de photons à : 1) la granulométrie des imbrûlés : 2) la vélocimétrie." Rouen, 1989. http://www.theses.fr/1989ROUES030.

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Mesure de la distribution granulométrique de particules de suies dans un tunnel de dilution. Application d'une méthode vélocimétrique basée sur l'annulation de la fonction de corrélation de l'intensité à des temps finis. Bon accord des résultats expérimentaux et des prévisions théoriques

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21

Dali, Sarabjyot Singh. "Analysis of dense colloidal dispersions with multiwavelength frequency domain photon migration measurements." [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1751.

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Idrissi, Bougrine Aziz. "Ecoulement en conduite de melange solide-liquide : champ des vitesses en ecoulement vertical." Université Louis Pasteur (Strasbourg) (1971-2008), 1987. http://www.theses.fr/1987STR13088.

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Etude de l'effet de la taille des particules solides et de leur concentrations sur l'allure des profils de vitesses des suspensions en ecoulement vertical ascendant dans une conduite. Etude experimentale par anemometrie ultrasonore

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23

Friend, Adrian J. "Multi-criteria ranking and source apportionment of airborne particulate matter." Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/60468/1/Adrian_Friend_Thesis.pdf.

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Particulate matter research is essential because of the well known significant adverse effects of aerosol particles on human health and the environment. In particular, identification of the origin or sources of particulate matter emissions is of paramount importance in assisting efforts to control and reduce air pollution in the atmosphere. This thesis aims to: identify the sources of particulate matter; compare pollution conditions at urban, rural and roadside receptor sites; combine information about the sources with meteorological conditions at the sites to locate the emission sources; c

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Thomas, Stephen Bradley. "Characterisation of ambient fine and ultrafine atmospheric aerosols." Thesis, Queensland University of Technology, 2001.

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Bouaniche, Alexandre. "A hybrid stochastic-sectional method for the simulation of soot particle size distributions Vitiated high karlovitz n-decane/air turbulent flames: scaling laws and micro-mixing modeling analysis A hybrid stochastic/fixed-sectional method for solving the population balance equation." Thesis, Normandie, 2019. http://www.theses.fr/2019NORMIR23.

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Les particules de suie (qui sont un type de particules ultrafines) peuvent être produites et émises dans des conditions de combustion riche. Les secteurs comme les transports (routier et aérien), où l'industrie sont des contributeurs significatifs aux émissions de particules. Celles-ci sont habituellement considérées comme des polluants dans la mesure où leur impact négatif sur la santé a été mesuré. Dans certains cas spécifiques comme la production de nanomatériaux, elles peuvent être synthétisées de manière volontaire. Dans les deux cas, une compréhension précise et une capabilité de prédict

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Darley, A. D. "Particle size distribution effects in chocolate processing." Thesis, University of Bradford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.253973.

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Oliveira, Pedro. "Des propriétés morphologiques des flocs biologiques aux conditions de fonctionnement de systèmes à boues activées." Phd thesis, Toulouse, INPT, 2018. http://oatao.univ-toulouse.fr/20946/3/OLIVEIRA_Pedro_20946.pdf.

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Parmi les différentes technologies pour produire un effluent conforme aux normes de rejet en vigueur, les Procédés par Boues Activées sont largement utilisés en tant que traitement biologique du fait de leur faible coût et de leur facilité d’implémentation. Ces procédés réalisent l’abattement des polluants en deux étapes : (1) la biodégradation par des microorganismes dans un bassin d’aération et (2) la séparation de la biomasse par décantation. Les paramètres opératoires peuvent agir sur l’efficacité du procédé, notamment en modifiant les propriétés des boues . L’objectif de ce travail est d’

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Johnson, Graham Richard. "The Formation and Growth of Marine Aerosols and the Development of New Techniques for their In-situ Analysis." Thesis, Queensland University of Technology, 2005. https://eprints.qut.edu.au/16117/1/Graham_Johnson_Thesis.pdf.

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Marine aerosols have attracted increasing attention over the past 15 years because of their potential significance for global climate modelling. The size distribution of these aerosols extends from super-micrometer sea salt mode particles down through 150 nm accumulation mode particles, 40 nm Aitken mode particles and nucleation mode particles which extend from 25 nm right down to clusters of a few molecules. The process by which the submicrometer modes form and grow and their composition have remained topics of debate throughout this time in large part because of the diff

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Johnson, Graham Richard. "The Formation and Growth of Marine Aerosols and the Development of New Techniques for their In-situ Analysis." Queensland University of Technology, 2005. http://eprints.qut.edu.au/16117/.

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Marine aerosols have attracted increasing attention over the past 15 years because of their potential significance for global climate modelling. The size distribution of these aerosols extends from super-micrometer sea salt mode particles down through 150 nm accumulation mode particles, 40 nm Aitken mode particles and nucleation mode particles which extend from 25 nm right down to clusters of a few molecules. The process by which the submicrometer modes form and grow and their composition have remained topics of debate throughout this time in large part because of the difficulties assoc

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Mazaheri, 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.

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Emissions from airport operations are of significant concern because of their potential impact on local air quality and human health. The currently limited scientific knowledge of aircraft emissions is an important issue worldwide, when considering air pollution associated with airport operation, and this is especially so for ultrafine particles. This limited knowledge is due to scientific complexities associated with measuring aircraft emissions during normal operations on the ground. In particular this type of research has required the development of novel sampling techniques which must take

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Mazaheri, Mandana. "Investigation into submicrometer particle and gaseous emissions from airport ground running procedures." Queensland University of Technology, 2009. http://eprints.qut.edu.au/29183/.

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Emissions from airport operations are of significant concern because of their potential impact on local air quality and human health. The currently limited scientific knowledge of aircraft emissions is an important issue worldwide, when considering air pollution associated with airport operation, and this is especially so for ultrafine particles. This limited knowledge is due to scientific complexities associated with measuring aircraft emissions during normal operations on the ground. In particular this type of research has required the development of novel sampling techniques which must take

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Ip, Trevor Tsz-Leung. "Influence of particle size distribution on fluidized bed hydrodynamics." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/27891.

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Past literature has shown that the production efficiency of a fluidized bed can be affected by changing the particle size distribution. The hydrodynamics of fine particle fluidization were studied with FCC and glass bead powders which have different surface-volume mean particle diameter (40-110 μM) and particle size distributions (narrow cut, wide cut and bimodal) under ambient conditions. Increasing the mean particle size increases the minimum fluidization velocity, minimum bubbling velocity and dense phase velocity (U[sub d]) while decreasing the voidages at minimum fluidization and minimum

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Jahanzad, Fatemeh. "Evolution of particle size distribution in suspension polymerisation reactions." Thesis, Loughborough University, 2004. https://dspace.lboro.ac.uk/2134/10300.

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Suspension polymerisation processes are commercially important for the production of polymer beads having wide applications. Polymers produced by suspension polymerisation can be directly used for particular applications such as chromatographic separations and ion-exchange resins. Particle Size Distribution (PSD) may appreciably influence the performance of the final product. Therefore, the evolution of PSD is a major concern in the design of a suspension polymerisation process. In this research, methyl methacrylate (MMA) has been used as a model monomer. A comparative study of MMA suspension

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Zhang, Shuo. "Relationship between particle size distribution and porosity in dump leaching." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/63383.

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Fluid flow is a critical process involved in the valuable metals extraction from low grade ore in heap and dump leaching as well as the release of harmful substances from waste rock piles. The mechanisms by which fluids move through the porous media depend on the fluid properties and the intrinsic properties of the porous media, with permeability being one critical factor. Particle size distribution is a key factor that affects permeability by forming pores of different structure and size. The objective of this research was to assess the particle size distribution in heterogeneous packed ore/r

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Leng, Tianyang. "Cellulose Nanocrystals: Particle Size Distribution and Dispersion in Polymer Composites." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/34073.

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This thesis describes the characterization of the particle size distribution of cellulose nanocrystals (CNC), the synthesis and characterization of fluorescent CNCs, and the development of a fluorescence microscopy method to probe the distribution of fluorescent CNCs in polymer composites. In this thesis, several methods are used to characterize the size of CNC particles. Size distribution measurements by single particle counting methods (Transmission electron microscopy, Atomic force microscopy) are compared to an ensemble method, Dynamic lighting scattering (DLS) and differences between the

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36

Hildebrand, Erin N. "The effect of particle size distribution on spectral backscattering coefficient." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0015/MQ57296.pdf.

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Gursky, Barry Michael. "Particle size distribution optimization of filler content in shingle asphalt." Thesis, Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/20989.

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Rekhibi, Soliman Abograra. "Condition monitoring of mining machinery using debris particle size distribution." Thesis, University of Nottingham, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335821.

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Krecl, Patricia. "Impact of residential wood combustion on urban air quality." Doctoral thesis, Stockholm : Department of Applied Environmental Science (ITM), Stockholm university, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-7682.

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Ukeje, Michael Anayo. "Effect of particle size distribution on the rheology of dispersed systems." Thesis, Imperial College London, 2000. http://hdl.handle.net/10044/1/7492.

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Tileti, Pramod Reddy. "Moldability of MIM feedstocks with varying particle size distribution and shape." Thesis, KTH, Materialvetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-123691.

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VIZCARRA, GINO OMAR CALDERON. "EFFECT OF PARTICLE-SIZE-DISTRIBUTION ON MECHANICAL BEHAVIOR OF RAILWAY BALLAST." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2015. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=29913@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>PROGRAMA DE EXCELENCIA ACADEMICA<br>O efeito da granulometria no comportamento mecânico do lastro tem sido estudado por vários pesquisadores. A revisão destes estudos indicou que uma granulometria mais uniforme que as atualmente usadas pela indústria ferroviária diminuiria a deformação permanente e a degradação do lastro ferroviário. Neste estudo, foi utilizado o equipamento prismoidal triaxial cíclico, projetado

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Vazirizadeh, Ali. "The relationship between hydrodynamic variables and particle size distribution in flotation." Doctoral thesis, Université Laval, 2015. http://hdl.handle.net/20.500.11794/25868.

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La flottation industrielle est un procédé continu qui se déroule souvent en plusieurs étapes et dans lequel des particules d'une espèce de minéral donnée (généralement celles d'intérêt), présentes en différentes tailles, rencontrent une grande quantité de bulles de gaz (normalement de l'air) pour produire des agrégats bulles-particules minérales, qui sont extraits du dispositif de flottation (colonne ou cellule) en tant que produit de valeur (concentré). Le contenu en bulles est décrit par les conditions hydrodynamiques régnant dans le réacteur de flottation. Celles-ci sont reconnues pour leur

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Bianco, Nicola. "Optimal control of particle size distribution in semi-batch emulsion polymerisation." Thesis, Imperial College London, 2009. http://hdl.handle.net/10044/1/7474.

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Almeida, Ivo Torres de. "A poluição atmosférica por material particulado na mineração a céu aberto." Universidade de São Paulo, 1999. http://www.teses.usp.br/teses/disponiveis/3/3134/tde-31012002-170628/.

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Foram abordadas questões relacionadas com a temática da poluição atmosférica provocada pelo material particulado em suspensão. Dois ambientes foram selecionados para estudo: um ambiente de mineração e um ambiente urbano. Com o objetivo de obter uma avaliação preliminar da qualidade do ar nesses ambientes, foi realizado um programa de amostragem para cada área. Dois pontos básicos foram abordados nessa avaliação: a determinação da concentração de partículas totais em suspensão e a caracterização química e física do material particulado. A determinação das concentrações de partículas totais e

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Gorecki, Christophe. "Classification par échantillonnage de la densité spectrale d'énergie : Application à l'étude statistique des surfaces et à l'analyse de particules." Besançon, 1989. http://www.theses.fr/1989BESA2015.

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Etude d'un profilometre optique base sur la defocalisation d'un faisceau de lumiere blanche. Etude de deux dispositifs optonumeriques d'analyse statistique utilisant les techniques de fourier optiques: un analyseur de particules et un dispositif de classement automatique des surfaces non polies

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Zhang, Yanmin. "A study of suspension polymerisation of Methyl Mathacrylate and Styrene in a batch oscillatory baffled reactor." Thesis, University of Strathclyde, 1998. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=22173.

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One of the most important issues in suspension polymerisation process is the control of the final particle size distribution (PSD) as this is an indicator for both quality and financial matters. For polymer manufacturers, a narrow PSD is always welcome. The conventional reactors, e. g. stirred tank reactors, generally produce particles of a rather broad PSD. As a result, to explore a new type of polymerisation devices becomes a challenging task. The objectives of this PhD study are to apply a novel mixing apparatus, the oscillatory baffled reactor (OBR), to batch polymerisation of MMA and Styr

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Sun, Guanglin. "Influence of particle size distribution on the performance of fluidized bed reactors." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/32013.

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The effect of particle size distribution (PSD) on the performance of a fluidized bed reactor was investigated using the ozone decomposition reaction, combined with the study of hydrodynamics, for fresh and spent fluid cracking catalysts, each having three particle size distributions - wide, narrow and bimodal - all with nearly the same mean diameter (60 µm), the same particle density and the same BET surface area. The superficial gas velocity was varied from 0.1 to 1.8 m/s to include the bubbling, slugging, turbulent and fast fluidization regimes. The catalytic rate constant, based on the volu

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Elmaci, Bilhan. "The detection and wear in mining machinery by debris particle size distribution." Thesis, University of Nottingham, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.352968.

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Agarwal, Pawan 1971. "Modeling the pneumatic transport of solids with a bimodal particle size distribution." Thesis, The University of Arizona, 1997. http://hdl.handle.net/10150/278610.

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Particle size distribution (PSD) plays a key role in fluidization behavior. The effect of PSD in fluidized, gas-solid mixtures is elucidated by considering two types of bimodal particle mixtures. In the first case, a mixture of "large" particles, which engage in particle-particle collisions, and "small" particles or fines, which follow the fluid streamlines, are considered. In this case, one net effect of the fines is to decrease the pressure drop required to convey a given solids flux in a riser. In the second case, a mixture of two sizes of larger particles in which collisions between like a

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