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Дисертації з теми "Mass absorption coefficients"

Автор: Grafiati

Опубліковано: 19 жовтня 2024

Оновлено: 19 липня 2025

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1

Miller, Jacob. "Modelling the Effect of Catalysis on Membrane Contactor Mass Transfer Coefficients for Carbon Dioxide Absorption Systems." University of Cincinnati / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1627662756315225.

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2

Benmakhlouf, Hamza. "Key Data for the Reference and Relative Dosimetry of Radiotherapy and Diagnostic and Interventional Radiology Beams." Doctoral thesis, Stockholms universitet, Fysikum, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-114413.

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Accurate dosimetry is a fundamental requirement for the safe and efficient use of radiation in medical applications. International Codes of Practice, such as IAEA TRS-398 (2000) for radiotherapy beams and IAEA TRS-457 (2007) for diagnostic radiology beams, provide the necessary formulation for reference and relative dosimetry and the data required for their implementation. Research in recent years has highlighted the shortage of such data for radiotherapy small photon beams and for surface dose estimations in diagnostic and interventional radiology, leading to significant dosimetric errors tha

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3

Schweizer, Pia. "Analyse et quantification du lithium par le développement d'un dispositif innovant de spectrométrie et microanalyse X." Electronic Thesis or Diss., Sorbonne université, 2024. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2024SORUS207.pdf.

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L'analyse quantitative du lithium est aujourd'hui possible, mais repose sur l'usage de techniques destructives. Une analyse quantitative locale non-destructive est encore difficile à mettre en œuvre par les méthodes spectroscopiques classiques de laboratoire. Cette thèse vise à développer un dispositif innovant de quantification du lithium par microsonde électronique. L'implémentation d'une multicouche périodique et de fenêtres de séparation ultra fines dans un spectromètre de la microsonde de Castaing a permis la spectrométrie dans la gamme des très faibles énergies de photons X et ainsi la m

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4

Nordmann, Stephan. "Light absorption of atmospheric soot particles over Central Europe." Doctoral thesis, Universitätsbibliothek Leipzig, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-109901.

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Soot particles are a major absorber of shortwave radiation in the atmosphere. They exert a rather uncertain direct and semi-direct radiative effect, which causes a heating or in some cases a cooling of the atmosphere. The mass absorption coefficient is an essential quantity to describe this light absorption process. This work presents new experimental data on the mass absorption coefficient of soot particles in the troposphere over Central Europe. Mass absorption coefficients were derived as the ratio between the light absorption coefficient determined by multi angle absorption photometry (MAA

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5

Chery, Olivier. "Étude hydrodynamique et transfert de matière dans un contacteur gaz-liquide à film centrifuge dans le cadre de procédés de traitement d'effluents gazeux contenant du dioxyde de soufre et/ou des oxydes d'azote." Vandoeuvre-les-Nancy, INPL, 1994. http://docnum.univ-lorraine.fr/public/INPL_T_1994_CHERY_O.pdf.

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Dans le cadre d'un programme B. R. I. T. E. De la C. C. E. , nous étudions un procédé de traitement d'effluents gazeux contenant du dioxyde de soufre et/ou des oxydes d'azote, par absorption suivie de l'oxydation de ces espèces. Dans une première phase, nous avons utilisé un contacteur gaz-liquide ayant des caractéristiques de transfert de matière élevées: le réacteur à film centrifuge. La caractérisation hydrodynamique du contacteur a permis de mettre en évidence les régimes de fonctionnement, le comportement, du réacteur piston au réacteur parfaitement agité, ainsi que les paramètres essenti

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6

Hou, Longfeng. "Etude numérique sur le modèle de coefficient d’absorption corrélé en multi spectral." Thesis, Lyon, INSA, 2015. http://www.theses.fr/2015ISAL0068.

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Le transfert radiatif dû aux gaz joue un rôle important dans les applications industrielles comme les chambres de combustion, les sciences atmosphériques, etc. Plusieurs modèles ont été proposées pour estimer les propriétés radiatives des gaz. Le plus précis est l'approche dite Raie Par Raie (RPR). Cependant, cette méthode implique un coût de calcul excessif qui la rend inappropriée pour la plupart des applications. Néanmoins, elle reste la méthode de référence que nous utiliserons pour l'évaluation d’autres modèles approchés. Le modèle de coefficient d’absorption corrélé (Ck) est généralement

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7

Derdar, Mawaheb M. Zarok. "Experimental and kinetic modelling of multicomponent gas/liquid ozone reactions in aqueous phase. Experimental investigation and Matlab modelling of the ozone mass transfer and multicomponent chemical reactions in a well agitatated semi-batch gas/liquid reactor." Thesis, University of Bradford, 2010. http://hdl.handle.net/10454/4872.

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Due to the ever increasing concerns about pollutants and contaminants found in water, new treatment technologies have been developed. Ozonation is one of such technologies. It has been widely applied in the treatment of pollutants in water and wastewater treatment processes. Ozone has many applications such as oxidation of organic components, mineral matter, inactivation of viruses, cysts, bacteria, removal of trace pollutants like pesticides and solvents, and removal of tastes and odours. Ozone is the strongest conventional oxidant that can result in complete mineralisation of the organic pol

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8

Derdar, Mawaheb M. Zarok. "Experimental and kinetic modelling of multicomponent gas/liquid ozone reactions in aqueous phase : experimental investigation and Matlab modelling of the ozone mass transfer and multicomponent chemical reactions in a well agitated semi-batch gas/liquid reactor." Thesis, University of Bradford, 2010. http://hdl.handle.net/10454/4872.

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Анотація:

Due to the ever increasing concerns about pollutants and contaminants found in water, new treatment technologies have been developed. Ozonation is one of such technologies. It has been widely applied in the treatment of pollutants in water and wastewater treatment processes. Ozone has many applications such as oxidation of organic components, mineral matter, inactivation of viruses, cysts, bacteria, removal of trace pollutants like pesticides and solvents, and removal of tastes and odours. Ozone is the strongest conventional oxidant that can result in complete mineralisation of the organic pol

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9

MENDES, Marcus Vinícius Araújo da Silva. "Avaliação das propriedades de transporte de massa contendo adições minerais." Universidade Federal de Goiás, 2009. http://repositorio.bc.ufg.br/tede/handle/tde/1353.

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Анотація:

Made available in DSpace on 2014-07-29T15:18:25Z (GMT). No. of bitstreams: 1 dissertacao marcus vinicius mendes.pdf: 2369089 bytes, checksum: 841841ae88caf7c6c9adb67b65e533c5 (MD5) Previous issue date: 2009-10-06<br>The durability of reinforced concrete structures is damaged by the degrading action of the penetration of substances in the form of gases, vapors and liquids through the pores and cracks. It is known that water both in its pure form or containing dissolved ions such as chloride, sulphate, carbon dioxide or oxygen ions, can compromise the durability of concrete structures. In rein

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10

Garcia, Fernandez Carlos. "Modeling Optical Properties of Combustion Soot emitted in the Troposphere." Thesis, Besançon, 2015. http://www.theses.fr/2015BESA2040/document.

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Анотація:

Ce travail concerne la modélisation, à l’échelle moléculaire, de l’interaction entre des nanoparticules carbonées et le rayonnement électromagnétique. Le but est d’aider à la compréhension des propriétés optiques des particules de suie afin de mieux quantifier l’influence des suies sur l’atmosphère et le climat. L’étude de l’interaction rayonnement/particules de suie fraîche a été effectuée par la méthode PDI ; il a été montré que : i) le coefficient d’absorption massique (MAC) des particules de suie dépend de la répartition des atomes dans la particule et de leurs liaisons, en particulier ent

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11

Vidlák, David. "Využití absorpčních systémů v teplárenství." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-378742.

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Анотація:

Main goal of this work is familiarization with basic features of absorption heat pumps and it’s growing importance on the market. In the first part of the work there is a research for clarifying facts associated with such pumps. In the introduction there are descriptions of basic information from the field of heating industry and its connections to our systems. Next there is a brief analysis of price changes in electricity and heat in the last five years. Main part of the analytical section is a description of the used absorption system. Second part of the work is focused on the calculation of

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12

De, Silva Vashista C. "Core-Shell Based Metamaterials: Fabrication Protocol and Optical Properties." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc1062904/.

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The objective of this study is to examine core-shell type plasmonic metamaterials aimed at the development of materials with unique electromagnetic properties. The building blocks of metamaterials under study consist of gold as a metal component, and silica and precipitated calcium carbonate (PCC) as the dielectric media. The results of this study demonstrate important applications of the core-shells including scattering suppression, airborne obscurants made of fractal gold shells, photomodification of the fractal structure providing windows of transparency, and plasmonics core-shell with a ga

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13

Weerasekara, Aruna Bandara. "Electrical and Optical Characterization of Group III-V Heterostructures with Emphasis on Terahertz Devices." Digital Archive @ GSU, 2007. http://digitalarchive.gsu.edu/phy_astr_diss/16.

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Анотація:

Electrical and optical characterizations of heterostructures and thin ﬁlms based on group III-V compound semiconductors are presented. Optical properties of GaMnN thin ﬁlms grown by Metalorganic Chemical Vapor Deposition (MOCVD) on GaN/Sapphire templates were investigated using IR reﬂection spectroscopy. Experimental reﬂection spectra were ﬁtted using a non - linear ﬁtting algorithm, and the high frequency dielectric constant (ε∞), optical phonon frequencies of E1(TO) and E1(LO), and their oscillator strengths (S) and broadening constants (Γ) were obtained for GaMnN thin ﬁlms with different Mn

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14

"Two-wave coupling and time dependent absorption coefficient of photorefractive crystal =: 光折變晶体中之二波耦合與時間相關之吸收系數". Chinese University of Hong Kong, 1995. http://library.cuhk.edu.hk/record=b5888451.

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by Wing-keung Mak.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 1995.<br>Includes bibliographical references (leaves 51-53).<br>by Wing-keung Mak.<br>Acknowledgments --- p.i<br>Abstract --- p.ii<br>Table of Content --- p.iii<br>Chapter Chapter One --- Introduction --- p.1<br>Chapter Chapter Two --- Theory<br>Chapter 2.1 --- Theory of Two-wave Coupling --- p.3<br>Chapter 2.2 --- Theory of Fanning --- p.8<br>Chapter 2.3 --- Theory of Time Dependent Absorption Coefficients of Photorefractive Crystals --- p.10<br>Chapter Chapter Three --- Photorefractive Fabry-Perot Etalon<br>Chapt

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15

Chen, Xi 1981. "Carbon dioxide thermodynamics, kinetics, and mass transfer in aqueous piperazine derivatives and other amines." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-08-4312.

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To screen amine solvents for application in CO2 capture from coal-fired power plants, the equilibrium CO2 partial pressure and liquid film mass transfer coefficient were characterized for CO2-loaded and highly concentrated aqueous amines at 40 – 100 °C over a range of CO2 loading with a Wetted Wall Column (WWC). The acyclic amines tested were ethylenediamine, 1,2-diaminopropane, diglycolamine®, methyldiethanolamine (MDEA)/Piperazine (PZ), 3-(methylamino)propylamine, 2-amino-2-methyl-1-propanol and 2-amino-2-methyl-1-propanol/PZ. The cyclic amines tested were piperazine derivatives including

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16

Nordmann, Stephan. "Light absorption of atmospheric soot particles over Central Europe." Doctoral thesis, 2012. https://ul.qucosa.de/id/qucosa%3A11888.

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Анотація:

Soot particles are a major absorber of shortwave radiation in the atmosphere. They exert a rather uncertain direct and semi-direct radiative effect, which causes a heating or in some cases a cooling of the atmosphere. The mass absorption coefficient is an essential quantity to describe this light absorption process. This work presents new experimental data on the mass absorption coefficient of soot particles in the troposphere over Central Europe. Mass absorption coefficients were derived as the ratio between the light absorption coefficient determined by multi angle absorption photometry (MAA

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