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Dissertations / Theses on the topic 'Column injection'

Author: Grafiati

Published: 9 March 2023

Last updated: 31 July 2025

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1

Ramirez, Coterio Viviana A. "Optimization of Air-injection Spargers for Column Flotation Applications." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/71425.

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Column flotation cells have become the most popular machine designed for industrial applications that require the separation and concentration of wanted or unwanted minerals from the rest material associated in a pulp. To achieve this process separation an air sparging device, which is required to produce bubbles in the flotation cell is required. In column flotation operations, Sparger sparging devices are employed in column flotation operations to generate small bubbles into the cell with the aim to carry the the desired mineral to the surface for later be recovered and proceeded. However,

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2

Actkinson, John Ira. "Minesweeping for pressure actuated mines by air injection into a water column." Thesis, Monterey, California. Naval Postgraduate School, 2011. http://hdl.handle.net/10945/5493.

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Approved for public release; distribution is unlimited.<br>The U.S. Navy historically has not had an adequate means to remotely pressure-sweep for mines at reasonable speeds and cost, and this is still the case. The Navy has addressed such threats, but countermeasures are time consuming and considered to be very resource intensive. During this thesis two sets of data were collected in tow tank experiments using two different sizes of Bubble Squid apparatus. This thesis is a continuation of work already completed by Lieutenant Jeffery Murawski from December 2009. This continuation was able

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3

Bonariol, Francesco. "Sizing of a packed stripping tower for seawater injection process and H2S abatement on an FPSO." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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The purpose of this working thesis is to study and analyze in depth the sea water injection unit found upon an FPSO. In particular, attention is focused on the vacuum deaeration column used for the degasification of the seawater stream in two stages: the first, with a lower vacuum degree and the second with a higher vacuum degree. Moreover, this thesis studies the mass transfer operation, carrying out a profound dissertation of the mass transport phenomena, introducing the mass transfer equations and coefficients. This study has been developed because it is desired to size another stripp

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4

MacFarlane, John K., and Philip M. Gschwend. "Field analysis of groundwater for volatile organic contaminants using on-column aqueous injection capillary gas chromatography." MIT Energy Lab, 1987. http://hdl.handle.net/1721.1/18198.

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Northeast Utilities Service Company, Southern California Edison Company, Empire State Electric Energy Research Corporation, American Power Service Company, Standard Oil Company and New England Power Service Company under the MIT Energy Laboratory Utilites Program

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5

Schneider, Mark S. "Analysis of Organic Pollutants by Micro Scale Liquid-Liquid Extraction and On-column Large Volume Injection Gas Chromatography." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/46329.

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The analysis of organic pollutants in water is traditionally done following EPA procedures which commonly use liquid-liquid extraction. One liter of water is extracted three times with 60 mL of an organic solvent. The extract is concentrated and analyzed by gas chromatography. This procedure is time consuming and can cause losses of semi-volatile components, in addition to requiring a relatively large amount of organic solvent (180 mL). By performing the extraction directly in a GC autosampler vial using one milliliter of contaminated water and one milliliter of organic solvent, then inject

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6

HASEGAWA, Takuya, Tomonari UMEMURA, Akira KOIDE, et al. "Evaluation of an ODS Column Modified with Zwitterionic/Nonionic Mixed Surfactants and Its Application to Direct Injection Determination of Inorganic Anions." 日本分析化学会, 2005. http://hdl.handle.net/2237/8754.

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7

Yenco, Aileen C. "Decision Tree for Ground Improvement in Transportation Applications." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1384435786.

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8

Urio, Ricardo De Prá. "Desenvolvimento e avaliação de métodos de extração e separação cromatográfica em colunas monolíticas e superficialmente porosas para determinação de herbicidas triazínicos em solos e águas." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/46/46136/tde-05042016-103159/.

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O uso de pesticidas levou ao aumento da produtividade e qualidade dos produtos agrícolas, porém o seu uso acarreta na intoxicação dos seres vivos pela ingestão gradativa de seus resíduos que contaminam o solo, a água e os alimentos. Dessa forma, há a necessidade do monitoramento constante de suas concentrações nos compartimentos ambientais. Para isto, busca-se o desenvolvimento de métodos de extração e enriquecimento de forma rápida, com baixo custo, gerando um baixo volume de resíduos, contribuindo com a química verde. Dentre estes métodos destacam-se a extração por banho de ultrassom e a ext

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9

Manivannan, Sivaprasath. "Measuring permeability vs depth in the unlined section of a wellbore using the descent of a fluid column made of two distinct fluids : inversion workflow, laboratory & in-situ tests." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLX086/document.

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Dans les puits de production d’eau, de pétrole, de gaz et de chaleur géothermique, ou dans les puits d’accès à un stockage d’hydrocarbures, il est précieux de connaître la perméabilité de la formation ou de sa couverture en fonction de la profondeur, soit pour améliorer le modèle de réservoir, soit pour choisir les zones dans lesquelles procéder à des opérations spéciales.On propose une technique qui consiste à balayer la hauteur du découvert par une interface entre deux liquides de viscosités très contrastées. Le débit total qui pénètre la formation à chaque instant est ainsi une fonction de

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10

CARDOSO, VALBERT N. "Estudos farmacocineticos do sup131I-steviosideo e seus metabolitos." reponame:Repositório Institucional do IPEN, 1993. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10342.

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Made available in DSpace on 2014-10-09T12:37:34Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:03:32Z (GMT). No. of bitstreams: 1 05177.pdf: 1071515 bytes, checksum: 549d323670762fe6597fcda6cf7ea4fc (MD5)<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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11

GRASSI, DAVIDE. "Tecnologie innovative per il consolidamento di substrati di fondazione e opere geotecniche." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2022. http://hdl.handle.net/10281/366246.

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The PhD research activities are focused on ground improvement application. The objective is to study the permeation grouting technique in granular soils and to understand the hydro-mechanical properties that can be obtained using non-conventional injection materials. During the project it has been developed an injection apparatus and a monitoring system of the grouting process that is used to study the permeation process and to develop a theoretical, and then analytical and numerical approach. Furthermore, the injection apparatus is used to simulate the permeation of different injection mater

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12

Samuelsson, Jörgen. "Development of Methods for Phase System Characterization in Liquid Chromatography." Doctoral thesis, Uppsala universitet, Ytbioteknik, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8597.

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The aim of this thesis is first and foremost to improve the fundamental knowledge of nonlinear and preparative separation theory by focusing on some of the remaining “white spots” on the theoretical chromatographic map. Secondly, the acquired knowledge is used to develop, validate and execute new methods for phase characterization in liquid chromatography. The methodology used in this thesis is a combination of experiments, fundamental nonlinear theory and systematic computer simulations. A fundamental knowledge of the molecular interactions between the compounds to be separated and the separa

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13

Urio, Ricardo de Prá. "Cromatografia a líquido por injeção sequencial para a determinação de herbicidas triazínicos e metabólitos da atrazina explorando o uso de cela de longo caminho óptico e monitoramento on-line em estudos de adsorção." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/46/46136/tde-31082011-143740/.

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Estudou-se o emprego da Cromatografia a Líquido por Injeção Seqüencial (SIC) explorando o uso de uma cela de longo caminho óptico com guia de onda (LCW) de 100 cm para a melhora dos limites de detecção (LOD) e quantificação (LOQ) na determinação de atrazina (ATR), propazina (PRO) e simazina (SIM). Para isto, utilizou-se uma fase móvel com composição de 44:56 (v v-1) metanol : tampão acetato de amônio 1,25 mM, pH 4,7, coluna monolítica e a detecção espectrofotométrica em 238 nm. Obtiveram-se valores de LOD e LOQ, respectivamente, de 1,76 e 5,86 µg L-1 para ATR, 4,51 e 15 µg L-1 para P

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14

Batista, Alex Domingues. "Estratégias para aumento de sensibilidade e seletividade de separações cromatográficas em sistemas de análises em fluxo." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/64/64135/tde-30032015-152907/.

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A introdução de separações cromatográficas expandiu a aplicabilidade de sistemas de análises em fluxo. No entanto, a seletividade e sensibilidade de procedimentos são restritos devido à escassa disponibilidade de fases estacionárias que operam a baixas pressões. Sendo assim, foram desenvolvidos quatro procedimentos analíticos visando a melhoria destes aspectos. A primeira proposta explorou pioneiramente colunas de núcleo fundido em sistemas de análises por injeção em fluxo. A separação de metil, etil e propil parabenos foi selecionada com aplicação. As eficiências cromatográficas de quatro co

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15

Maniquet, Adrien. "Développement d’une vanne d’injection de liquide pour l’analyse en ligne par chromatographie en phase gazeuse et ses applications dans le domaine du raffinage : étude du comportement et apport des colonnes monolithiques courtes pour la chromatographie en phase gazeuse haute pression." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1336/document.

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En milieu industriel, si l'analyse en ligne d'effluents gazeux à l'aide de la chromatographie en phase gazeuse est actuellement réalisée sans difficultés majeure, l'analyse des liquides reste une des principales problématiques à résoudre. En effet, comparée à une analyse réalisée au laboratoire, l'analyse en ligne d'un échantillon liquide permettrait de s'affranchir de l'étape de prélèvement et de préparation avant injection ainsi que des problèmes de contamination et de représentativité de l'échantillon. Des systèmes d'injection de liquide en ligne sont actuellement disponibles, cependant, de

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16

Garcia, Ausberta Jesús Cabezas. "Metodologia analítica para determinação de triclosan e clorofenois por cromatografia a líquido de alta eficiência (HPLC) e cromatografia por injeção seqüencial (SIC) com uso de coluna monolítica e empacotada." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/46/46136/tde-28032012-112652/.

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Foram desenvolvidas metodologias de cromatografia a líquido de fase reversa baseadas em injeção sequencial (SIC) e em cromatografia a líquido de alta eficiência (HPLC) para determinação de triclosan em amostras de produtos de higiene pessoal e em estudos de adsorção em argilominerais naturais e modificados, visando determinar parâmetros de adsorção de triclosan frente a alguns de seus metabólitos. A determinação de triclosan em enxaguadores bucais foi realizada por SIC com eluição isocrática usando fase móvel constituída por acetonitrila: tampão fosfato de trietilamina 70 mM pH 3,5 na proporçã

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17

"Field analysis of groundwater for volatile organic contaminants using on-column aqueous injection capillary gas chromatography." Energy Laboratory, Massachusetts Institute of Technology, 1987. http://hdl.handle.net/1721.1/29474.

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by John K. McFarlane and Philip M. Gschwend.<br>Includes bibliographical references.<br>Sponsored by Northeast Utilities Service Company, Southern California Edison Company, Empire State Electric Energy Research Corporation, American Power Service Company, Standard Oil Company and New England Power Service Company under the MIT Energy Laboratory Utilites Program.

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18

Chih-Jung, Chang, and 張智榮. "A Study on the Analysis of Heavy Metals in Da-Han Stream by n- Column Injection in Gas Chromatography." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/55678530414617603389.

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碩士<br>輔仁大學<br>化學學系<br>81<br>Analysis of heavy-metal ions by using AA and HPLC was widely done in the past decades but the use of GC in analyzing heavy- metal ions was rarely heard of. Therefore, we decided on a simple, time-saving and highly accurate method of using GC in the analysis of several heavy-metals ions. We used Chelex-100 resin for pre-concentration of heavy-metals in the smaple. It has a high chelating selectivity which makes it suitable for separating traces of heavy metals fro

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19

Maier, Friedrich. "Improved tracer techniques for georeservoir applications." Thesis, 2014. http://hdl.handle.net/11858/00-1735-0000-0022-5D95-9.

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Für eine effiziente und nachhaltige Nutzung von Georeservoiren sind bestmögliche Reservoirmanagementverfahren erforderlich. Oft setzen diese Verfahren auf Tracer-Tests. Dabei enthalten die aufgezeichneten Tracersignale integrale Informationen der Reservoireigenschaften. Tracer-Tests bieten somit eine leistungsfähige Technik zur Charakterisierung und Überwachung der bewirtschafteten Georeservoire. Im Gegensatz zu Tracer-Tests mit konservativen Tracern, welche bereits etablierte Testroutinen zur Verfügung stellen, ist die Verwendung von reaktiven Tracern ein neuer Ansatz. Aufgrund unpassender ph

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