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Dissertations / Theses on the topic 'Laser particle size analyser'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Bryant, Ross Becker 1957. "Laser light scattering and geographic information systems: Advanced methods for soil particle size analysis and data display." Thesis, The University of Arizona, 1990. http://hdl.handle.net/10150/278039.

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Laser light scattering (LLS) is an alternate method for determining soil particle size. Since the majority of information on particle size analysis has traditionally been derived from sedimentation methods, it is important to be able to draw a relationship between these two methods. Twenty four soil samples from a set of 214 samples analyzed by LLS were selected and also analyzed using sedimentation techniques. Particle size percentages were obtained in five different size ranges and then these two techniques were compared. Linear regression equations were developed that convert numbers obtain

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2

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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3

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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4

Ren, Kuan Fang. "Diffusion des faisceaux feuille laser par une particule sphérique et applications aux écoulements diphasiques." Rouen, 1995. http://www.theses.fr/1995ROUES012.

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Les faisceaux de type feuille laser (faisceau gaussien de section elliptique), sont de plus en plus utilisés dans les applications des techniques de mesure pour élargir le domaine mesurable ou pour simplifier le traitement des signaux. Cette thèse concerne l'extension de la théorie de Lorenz-Mie généralisée (TLMG) à la diffusion des faisceaux feuilles laser par une particule sphérique et ses applications aux écoulements diphasiques. Une description mathématique du faisceau feuille laser est dérivée par deux méthodes différentes. L'intérêt de la TLMG dépend fortement de notre capacité pour calc

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5

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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6

Bultynck, Hervé. "Développements de sondes laser Doppler miniatures pour la mesure de particules dans des écoulements réels complexes." Rouen, 1998. http://www.theses.fr/1998ROUES031.

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Le diagnostic par des méthodes optiques basées sur l'anémométrie Doppler laser ou phase Doppler permet une meilleure connaissance des écoulements diphasiques. Cependant, l'encombrement de tels systèmes optiques limite leur utilisation. Grâce à la théorie de Lorenz-Mie généralisée, la dimension finie des faisceaux peut être prise en compte, ainsi, deux sondes laser Doppler miniatures ont pu être réalisées. Le développement d'une sonde phase Doppler miniature en rétrodiffusion est au centre de la première partie de cette thèse. L'originalité d'une telle sonde réside dans l'utilisation d'une seul

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7

Zhang, Lu. "Design and numerical simulation of the real-time particle charge and size analyser." Thesis, University of South Wales, 2010. https://pure.southwales.ac.uk/en/studentthesis/design-and-numerical-simulation-of-the-realtime-particle-charge-and-size-analyser(fcbc8f66-9758-4c24-abbd-ccc14a28307f).html.

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The electrostatic charge and size distribution of aerosol particles play a very important role in many industrial applications. Due to the complexity and the probabilistic nature of the different charging mechanisms often acting simultaneously, it is difficult to theoretically predict the charge distribution of aerosol particles or even estimate the relative effect of the different mechanisms. Therefore, it is necessary to measure the size and also the bipolar charge distribution on aerosol particles. The main aim of this research project was to design, implement and simulate a signal processi

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8

Jing, Cao. "Spray diagnostics by laser diffraction." Thesis, University of Sheffield, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321852.

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9

Onofri, Fabrice. "Prise en compte de la dimension finie des faisceaux d'éclairage en granulométrie optique : anémométrie phase Doppler. diagnostics des milieux diphasiques." Phd thesis, Université de Rouen, 1995. http://tel.archives-ouvertes.fr/tel-00287923.

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Le diagnostic par une méthode optique telle que l'anémométrie phase Doppler, des particules présentes dans les milieux diphasiques, nécessite l'emploi de faisceaux laser focalisés. La compréhension et l'élimination des effets engendrés sur les mesures de taille, par les gradients d'éclairage ou les « effets de trajectoire », est au centre de la première partie de cette thèse. Différentes solutions, testées numériquement et expérimentalement, sont proposées pour éliminer les biais constatés. L'extension de l'anémométrie phase Doppler à la mesure de la partie réelle et complexe (absorption) de l

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Onofri, Fabrice. "Prise en compte de la dimension finie des faisceaux d'éclairage en granulométrie optique : anémométrie phase Doppler. diagnostics des milieux diphasiques." Phd thesis, Rouen, 1995. https://tel.archives-ouvertes.fr/tel-00287923.

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Le diagnostic par une méthode optique telle que l'anémométrie phase Doppler des particules présentes dans les milieux diphasiques, nécessite l'emploi de faisceaux laser focalisés. La compréhension et l'élimination des effets engendrés par les gradients d'éclairage ou effets de trajectoire sur la mesure de la taille des particules sphériques est au centre de la première partie de cette thèse. Différentes solutions, testées numériquement et expérimentalement, sont proposées pour éliminer les biais constatés. L'extension de l'anémométrie phase Doppler à la mesure de la partie réelle et complexe (

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11

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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12

Yin, Chung-Yuan. "Soot particle size measurements in laminar premixed ethylene flames with laser-induced incandescence and scanning mobility particle sizer." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2009. http://wwwlib.umi.com/cr/ucsd/fullcit?p1460029.

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Thesis (M.S.)--University of California, San Diego, 2009.<br>Title from first page of PDF file (viewed January 9, 2009). Available via ProQuest Digital Dissertations. Includes bibliographical references (p. 46-48).

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13

Williams, Diane Keith. "Particle Size Dependence on the Luminescence Spectra of Eu3+:Y2O3 and Eu3+:CaO." Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/29719.

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Since the Eu3+ ion can occupy different cation sites in a host material, it can serve as a useful probe of nanocrystalline structures to gain more insight into the structural changes that can occur when the particle size is reduced from the bulk to nanometer regime. The use of laser spectroscopy to probe two nanocrystalline structures, Eu3+:Y2O3 and Eu3+:CaO, was investigated. The nanocrystalline structures were prepared by the laser-vaporization-gas-phase condensation of the bulk oxides. The particle size distribution and dominant particle diameters of the nanocrystals were determined by

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14

Lynch, James Andrew. "A study of smoke aging examining changes in smoke particulate size." Link to electronic thesis, 2004. http://www.wpi.edu/Pubs/ETD/Available/etd-0510104-194400/.

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15

Cenker, Emre. "Imaging measurements of soot particle size and soot volume fraction with laser-induced incandescence at Diesel engine conditions." Thesis, Châtenay-Malabry, Ecole centrale de Paris, 2014. http://www.theses.fr/2014ECAP0049/document.

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Le travail présenté dans ce manuscrit concerne les mesures de taille de particule et de fraction volumique de suies dans des conditions moteur Diesel. Les techniques utilisées sont la laser-Induced incandescence (LII), la méthode d’extinction laser (LEM), la pyrométrie, et l’analyse d’images de microscopie électronique par transmission (TEM) d’échantillons prélevés in-Situ. Des stratégies de mesure de tailles de particules sont développées en se basant sur l’utilisation d’un modèle LII et en analysant la poly-Dispersion des tailles de particules, aussi bien à partir de signaux de LII résolu en

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16

Davies, Emlyn John. "Scattering properties of suspended particles." Thesis, University of Plymouth, 2013. http://hdl.handle.net/10026.1/1577.

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Effective monitoring and modelling of the marine environment is of importance to both the general public and the scientific community, but relies on the ability to obtain accurate measurements of suspended particle characteristics. Many instruments for measuring particles rely on optical and acoustic scattering from the particles and use this information to infer a particle size and concentration. However, assumptions such as spherical particles of a known composition are widely used, both in measurement technology and in numerical modelling. Various imaging techniques have shown great variabi

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17

Menkiel, Barbara. "Investigation of soot processes in an optical diesel engine." Thesis, Brunel University, 2012. http://bura.brunel.ac.uk/handle/2438/6970.

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This study is dedicated to investigation of soot formed during combustion in diesel engine. Measurements were performed in a high speed direct injection optical diesel engine. Initially soot particle size, size distribution and soot volume fraction were investigated using time resolved laser induced incandescence (TR-LII) technique. For this study standard diesel fuel was used and measurements were performed for various injection timing and two different engine loads. Investigation showed that TR-LII is a powerful tool that can be used for characterization of in-cylinder soot in the engines. S

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18

Moses, Lance. "Fluorescence Imaging of Analyte Profiles in an Inductively Coupled Plasma with Laser Ablation as a Sample Introduction Source." BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/4367.

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Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) has risen to among the top tier techniques for the direct analysis of solid samples. However, significant problems remain that must be solved to achieve the full analytical potential of LA-ICP-MS. Inefficient conversion of aerosol to ions within the ICP or transmission through the MS interface may decrease precision, sensitivity, and/or accuracy. Although fundamental mechanisms that govern ion production and transmission have been studied extensively in solution-nebulization (SN) ICP-MS instruments, significant gaps in our

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19

Wang, 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.

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Due to their large surface area, complex chemical composition and high alveolar deposition rate, ultrafine particles (UFPs) (< 0.1 ìm) pose a significant risk to human health and their toxicological effects have been acknowledged by the World Health Organisation. Since people spend most of their time indoors, there is a growing concern about the UFPs present in some indoor environments. Recent studies have shown that office machines, in particular laser printers, are a significant indoor source of UFPs. The majority of printer-generated UFPs are organic carbon and it is unlikely that these par

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20

Psikal, Jan. "Ion acceleration in small-size targets by ultra-intense short laser pulses (simulation and theory)." Thesis, Bordeaux 1, 2009. http://www.theses.fr/2009BOR13941/document.

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Cette thèse a pour but l'étude de l’interaction des impulsions laser brèves et ultra-intenses avec des cibles de petite taille. Nous nous intéressons surtout des phénomènes liés à l’accélération des ions aux granges énergies. L'outil principal de cette étude est notre code Particle-in-Cell (PIC) bidimensionnel, qui est capable d'effectuer le calcul du mouvement des particules et de l'évolution des champs en régime relativiste et sans collisions. Ce mémoire présente la théorie de l’accélération d’ions par laser, les simulations numériques des différents régimes d'accélération, ainsi que les alg

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21

Uys, Charlene Ethel. "Preparation and characterisation of pheroid vesicles / Charlene Ethel Uys." Thesis, North-West University, 2006. http://hdl.handle.net/10394/1669.

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22

Cenker, Emre [Verfasser], Christof [Akademischer Betreuer] Schulz, Stefan [Akademischer Betreuer] Will, and Pascale [Akademischer Betreuer] Desgroux. "Imaging measurements of soot particle size and soot volume fraction with laser-induced incandescence at Diesel engine conditions / Emre Cenker. Gutachter: Stefan Will ; Pascale Desgroux. Betreuer: Christof Schulz." Duisburg, 2015. http://d-nb.info/1065179995/34.

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23

Elihn, Karine. "Synthesis of carbon-covered iron nanoparticles by photolysis of ferrocene." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2002. http://publications.uu.se/theses/91-554-5302-3/.

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24

Boivie, Klas. "On the Manufacturing of SFF Based Tooling and Development of SLS Steel Material." Doctoral thesis, KTH, Production Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3814.

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25

PAPINI, CLAUDEMIR J. "Estudo comparativo de metodos de determinacao do tamanho de particula." reponame:Repositório Institucional do IPEN, 2003. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11152.

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Made available in DSpace on 2014-10-09T12:48:55Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:00:35Z (GMT). No. of bitstreams: 1 09604.pdf: 6894956 bytes, checksum: 537f0618ac453f105325642d96ab808b (MD5)<br>Dissertacao (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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26

Bernardoni, E. "FIELD-SCALE ASSESSMENT OF NUTRIENT AND SOIL LOSSES DURING SURFACE RUNOFF EVENTS, IN AN OLTREPÒ PAVESE (SOUTHERN LOMBARDY ¿ ITALIAN REGION) VINEYARD HILL." Doctoral thesis, Università degli Studi di Milano, 2013. http://hdl.handle.net/2434/218169.

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The aim of my Ph.D. work was to investigate sediment transport and nutrient content in runoff water from an agricultural system. The study was carried out in a representative sites of the Oltrepò Pavese, in Lombardy region (northern Italy) in a vineyard equipped with instruments for measuring volume and rate of runoff and collecting samples to determine the amount of soil loss related to each rainfall event. The site was equipped with a weather station, which included a recording rain gauge. The analysis was done under natural rainfall condition during the period December 2008 - December 2

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27

Twahirwa, Joseph. "Evaluation of infiltration, run-off and sediment mobilisation using rainfall simulations in the Riebeek-Kasteel Area, Western Cape - South Africa." Thesis, University of the Western Cape, 2010. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_3938_1298351935.

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<p>The project was conducted on a small-scale catchment at Goedertrou in the Riebeek- Kasteel district. The focus of this study was to address some of the hydrological processes active in the research catchment, namely infiltration, run-off and sediment mobilisation on different soil types. It was done to investigate the origin of Berg River pollutants. To answer the overall question about what influence the natural salt load of the Berg River, a number of subprojects have been identified, one of which is to understand the hydrological processes in the soil mantle and vadose zone. Hence, the s

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28

Milea, Andrei-Silviu. "Experimental investigation of innovative Low NOx / low soot injection systems for spinning combustiοn technology using advanced laser diagnostics". Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMIR43.

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Les effets anthropogéniques sur l’environnement posent un défi majeur pour l’industrie aéronautique. Des réglementations de plus en plus strictes et la nécessité de rendre le transport aérien durable orientent les recherches actuelles vers des systèmes propulsifs innovants. Dans ce contexte, Safran Helicopter Engines développe sa technologie brevetée de combustion giratoire (SCT), visant à améliorer les performances des moteurs d’hélicoptères. Déjà implémentée sur le moteur Arrano, cette technologie est davantage optimisée pour réduire significativement les émissions de NOx et de suies. Dans l

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29

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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31

Arnett, Morgan P. "Particle Size Distribution of Gypseous Samples." 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-658.

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Particle size distribution (PSD) of gypseous soils is important in the soil science community. When gypsum constitutes a major portion of the soil, its removal prior to PSD analysis distorts the results and may lead to textures that do not relate to conditions in the field. In order to understand the true characterization of the soil and the gypsum particles, the entire soil sample should be analyzed. Four different approaches to the BaCl2 method presented in the literature (Hesse, 1976, Matar and Douleimy, 1978, Viellefon, 1979) were used to evaluate the use of BaCl2 solution to reduce the so

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32

Cortes, Ana Sofia Mendonça. "Comparative study of particle size distribution analysis by laser diffraction between dry and liquid dispersion methods." Master's thesis, 2017. http://hdl.handle.net/10362/25660.

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Particle size is an important variable, especially in the pharmaceutical industry, since this is one of the parameters that can influence medicines performance. Drugs can be administered by different routes of administration and in different dosage forms. The active products analyzed in this study are characterized as inhalation products to be administered as dry powder inhalers. This type of active product is characterized by particles between 1 μm and 5 μm. Particles in this diameter range can travel through the lungs to the bronchi and alveoli area, where they settle by sedimentation. The

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Sequeira, Sara Tomás. "Comparative study of particle size distribution analysis by laser diffraction between dry and wet dispersion methods and scanning electron microscopy." Master's thesis, 2018. http://hdl.handle.net/10362/38119.

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An Active pharmaceutical Ingredient (API) may assume several different physical forms such as dry powders, wet dispersions and semi-solid dispersions. Depending on the route of administration, the size of API particles may be considered a critical attribute, since this property may affect a variety of product characteristics, such as reactivity, stability, efficacy, texture, fluidity, viscosity, density among others. Fine API particles below ten micrometers in size, are required for pharmaceutical formulations administered by the pulmonary and ophthalmic routes. To achieve the desired particl

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34

Berger, Gunther Franz-Martin. "Software for a particle-size analyser based on image analysis techniques." Thesis, 2015. http://hdl.handle.net/10539/16253.

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This dissertation describes a technique of obtaining particle-size measurement using 2-dimensional image analysis. Images of coarse material on run-of- mine conveyor belts may be processed using the methodology described and size-calculation of particles is possible to a high degree of accuracy. The processing involves a histogram modification technique for performing image segmentation, a rule-driven procedure for merging regions and a region-splitting method to resolve particles that are joined together. Images of varying brightness and contrast may be processed without adjustment of

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Hsu, Chih-Chieh, and 許智傑. "Refractive Index and Particle Size Measurement Using Laser Diffractometer." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/77569747320577834995.

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碩士<br>國立交通大學<br>機械工程學系<br>98<br>This research presents a new measurement method for refractive index based on a laser diffractometer, in which a reflective diffraction beam coincides with an incident beam. With the angle of a reentry beam, grating pitch, and laser wavelength, we can calculate the refractive index. This study proposes a new method combined with the Littrow configuration, grating pitch measurement, and immersion diffractometry. This study uses the standard grating of pitch 833 nm with the method mentioned above to determine the refractive index of transparent liquids such as wat

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Grounds, Stephanie Beth. "Mars Exploration Rover (MER) Panoramic Camera (Pancam) Twilight Image Analysis for Determination of Planetary Boundary Layer and Dust Particle Size Parameters." Thesis, 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8635.

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How the dust cycle works on Mars is a key atmospheric issue, as the dust cycle is arguably the dominant cycle in the current Martian climate. In addition, how much is known about the Martian planetary boundary layer is mostly determined from models with very little in-situ data from contemporaneous studies to validate such boundary layer characteristic assumptions, and the model studies have not been able to define a known height for a possible boundary layer on Mars using ground-based investigations prior to this research. The Mars Exploration Rovers (MERs), however, show promise in offering

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