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Relevant bibliographies by topics / Humidification / Dissertations / Theses

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Dissertations / Theses on the topic 'Humidification'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Dalili, Farnosh. "Humidification in Evaporative Power Cycles." Doctoral thesis, KTH, Chemical Engineering and Technology, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3469.

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<p>Evaporative gas turbine cycles (EvGT) show an exceptionalexhaust heat recovery potential, which makes them a strongcompetitor to other advanced gas turbine cycles, especiallyfrom small to intermediate sizes. Evaporative gas turbines aredistinguished by humidifying the working fluid beforecombustion at temperatures below the boiling point of water;and the heat required for evaporation of water is partly takenout of the exhaust gas. Thus, humidification is a key operationin these cycles. This thesis investigates, both theoreticallyand experimentally, two alternative approaches tohumidificatio

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2

Pandey, R. "Studies on humidification of PEM fuel cells." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2019. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/5849.

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Proton exchange membrane (PEM) fuel cell is an electrochemical energy conversion device which converts chemical energy of hydrogen into electrical energy via redox reactions. The Pt/C (Platinum on carbon) catalyst layers at anode and cathode facilitate oxidation of hydrogen and reduction of oxygen, respectively. These catalyst layers are separated by an ion-exchange membrane. Besides acting as an electrical insulator thereby preventing shorting of the fuel cell, the main purpose of this membrane is to allow protons to migrate selectively from anode to cathode without allowing the gaseous react

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3

Al-Ismaili, Abdulrahim M. "Modelling of a humidification-dehumidification greenhouse in Oman." Thesis, Cranfield University, 2009. http://dspace.lib.cranfield.ac.uk/handle/1826/6568.

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The humidification-dehumidification (HD) greenhouse is a relatively new technology. In addition to the humidification process and cultivation normally present in greenhouses in arid countries, the HD greenhouse also integrates a dehumidification process. In these greenhouses, saline or brackish water is evaporated in the ordinary evaporative cooling pads (i.e. 1st humidifier) before passing through the main crop growing section. The air is further loaded with more moisture by passing it through a 2nd humidifier. This humidification process is then followed by a dehumidification process to cond

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4

Miller, Jacob A. S. M. Massachusetts Institute of Technology. "Numerical balancing in a humidification dehumidification desalination system." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/68692.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (p. 115-118).<br>This thesis details research on the thermal and concentration balancing of a humidification dehumidification desalination system. The system operates similarly to the natural rain cycle. Seawater is heated, sprayed into an airstream to increa

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Nevarez, Victor. "Extraction based thermodynamic balancing for a humidification dehumidification desalination plant." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/75451.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student submitted PDF version of thesis.<br>Includes bibliographical references (p. 54).<br>Humidification dehumidification (HDH) desalination is a thermal driven desalination technology. One of the main issues with HDH desalination is the high energy consumption involved. The energy efficiency of thermal desalination systems is given by

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Liburd, Shannon Omari. "Solar-driven humidification dehumidification desalination for potable use in Haiti." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62033.

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Thesis (S.M. in Technology and Policy)--Massachusetts Institute of Technology, Engineering Systems Division, Technology and Policy Program, 2010.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (p. 108-112).<br>Worldwide water scarcity, especially in the developing world, provides the impetus for utilizing inexpensive desalination technologies on a wider scale to contribute to freshwater supply. S

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Mistry, Karan H. (Karan Hemant). "Second law analysis and optimization of humidification-dehumidification desalination cycles." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/61911.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2010.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 139-143).<br>Humidification-Dehumidification (HD) desalination is a thermal distillation method that has the potential to be driven using solar heating. It is a promising technology that can potentially bring safe drinking water to people of the developing world. Surprisingly, few systematic efforts have been made to find the best HD cycles or to improve and optimize existing cycles. This thesis applies irreversibility

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8

Chari, Arvind. "A global strategy for the deployment of humidification-dehumidification technology." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/69664.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2011.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 88-95).<br>The world is suffering from a severe shortage of potable water. This effect is most noticeable in third-world regions, specifically in rural Africa and Asia. In these regions, clean water exhaustion has resulted in a myriad of negative affects such

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Govindan, Prakash Narayan. "Thermal design of humidification dehumidification systems for affordable and small-scale desalination." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/78176.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 249-262).<br>The humidification dehumidification (HDH) technology is a carrier-gas-based thermal desalination technique ideal for application in a small-scale system but, currently, has a high cost of water production (about 30 $/m³ of pure water produced). The present thesis describes fundamental contributions to the thermal design of HDH systems that have made them affordable (< 5 $/m³). These contributions include:

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10

Breitwieser, Matthias, Riko Moroni, Jonathan Schock, et al. "Water management in novel direct membrane deposition fuel cells under low humidification." Elsevier, 2016. https://publish.fid-move.qucosa.de/id/qucosa%3A72518.

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Polymer electrolyte membrane fuel cells (PEMFCs) fabricated by direct membrane deposition (DMD) were shown to work even at dry conditions without significant deterioration of the membrane resistance. Here, in situ neutron radiography is used to investigate the water management in those fuel cells to uncover the phenomena that lead to the robust operation under low humidification. A constant level of humidification within the membrane electrode assembly (MEA) of a DMD fuel cell is observed even under dry anode operation and 15% relative humidity on the cathode side. This proves a pronounced bac

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11

Branco, Telma Filipa Aires. "O desafio de abastecimento descentralizado de água: avaliação do potencial de dessalinização por energia solar." Master's thesis, ISA, 2013. http://hdl.handle.net/10400.5/6483.

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Mestrado em Engenharia do Ambiente - Instituto Superior de Agronomia<br>Coping with water scarcity is one of the world biggest challenges, and in this sense, desalination has assumed an important role as an alternative solution for water supply. However the high energy consumption is a main drawback of this technology. The use of renewable energy as an alternative energy supply can contribute to a more environmentally sustainable desalination process. This work aims to illustrate the different available desalination technologies, and understand how these technologies can be combined with rene

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12

Solmus, Ismail. "Theoretical And Experimental Investigation Of A Humidification-dehumidification Desalination System Using Solar Energy." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/2/12607622/index.pdf.

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In this thesis, experimental and numerical studies have been carried out to investigate the performance of a solar desalination system working on humidification-dehumidification principle under the climatological conditions of Ankara, Turkey. The desalination unit was configured mainly by a double-pass flat plate solar air heater with two glass covers, pad humidifier, storage tank and dehumidifying exchanger. The system used in this work is based on the idea of closed water and open air cycles. A computer simulation program based on the mathematical model was developed by means of MATLAB softw

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13

Al-Taweel, Yasser Amer. "A simulation model of infant-incubator-feedback system with humidification and temperature control." AUT University, 2006. http://hdl.handle.net/10292/975.

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A comprehensive simulation model for the infant-incubator-feedback system was developed in a Matlab/Simulink® environment to investigate all heat exchange relationships, variables and factors that have an influence on the overall thermo-neutrality of the environment. The model was also used to determine the benefits and limitations of using a convectively heated single-walled incubator in nursing preterm infants with very low birth weight < 1000 grams and low gestational age 28 weeks. The infant was modelled as one-lump with two layers; core and skin. The infant shape was approximated to a cyl

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14

Evans, John P. "Experimental Evaluation of the Effect of Inlet Gas Humidification on Fuel Cell Performance." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/9597.

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The development and evaluation of a fuel cell test stand incorporating various methods for controlling the temperature and humidity of fuel cell reactants is described. The test stand is capable of accurately metering gas flows, controlling the temperature and humidity of the gases, and delivering the gases to the fuel cell in a safe manner. Additionally, the test stand can measure the voltage and current produced by the fuel cell during operation. Two test stands were constructed and evaluated, one using steam injection for fuel cell stacks and the other using flash evaporation for individual

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15

Huang, Jeffrey H. (Jeffrey Heining). "Design of a mobile community level water treatment system based on Humidification Dehumidification desalination." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/74443.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 49-50).<br>In order to successfully deploy the mobile desalination technology being developed at the Rohsenhow Kendall Heat Transfer Laboratories, it is necessary to design a three dimensional, solid model of the technology. This Humidification Dehumidification (HDH) based technology aims to be applied at community level water supplies, bringing clean water to those countries with inadequate water infrastructure. The mo

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McGovern, Ronan Killian. "Saturation curve analysis of humidification-dehumidification desalination systems and analysis of reversible ejector performance." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/70443.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 103-105).<br>The limitations upon the efficiency of humidification-dehumidification (HDH) desalination systems are investigated. Secondly, ejector technologies are analyzed as a means of powering desalination systems thermally. Thermal desalination systems offer advantages over membrane technologies in terms of robustness. They are less prone to scaling and fouling and capable of treating feed water of higher temperatur

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17

Cheung, Wai-ki, and 張慧琪. "The use of humidification system to reduce the work of breathing in mechanical ventilated patients." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hdl.handle.net/10722/193078.

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Critically ill patients in an intensive care unit (ICU) often require mechanical ventilation (MV). Humidification systems are essential devices for MV which replace the natural heat and moisture exchange process of inspired gases. A heat and moisture exchanger (HME) is commonly used for the humidification of MV patients in ICU. In contrast, a heated humidifier (HH) that is a more complicated device is used only for prolonged MV patients because of its higher cost and nurse workload. However, HME may increase the breathing workload of patients, thereby inflicting damage to their respiratory fun

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18

Hassabou, Abdel Hakim [Verfasser]. "Experimental and Numerical Analysis of a PCM-Supported Humidification-Dehumidification Solar Desalination System / Abdel Hakim Hassabou." München : Verlag Dr. Hut, 2012. http://d-nb.info/1028784554/34.

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19

Alshihabi, Omran. "Étude en laboratoire du comportement d'un sol compacté non saturé : influence des cycles de séchage-humidification." Lille 1, 2002. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2002/50376-2002-167-168.pdf.

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Le travail de thèse porte sur une étude expérimentale du comportement d'un sol compacté partiellement saturé. Il s'intéresse également sur l'effet des cycles séchage - humidification sur ce comportement. L'étude a été réalisée à l'aide des œdomètres et des cellules triaxiales qui permettent de contrôler la succion. Ce travail comporte quatre parties. La première concerne une étude bibliographique des travaux réalisés sur les sols compactés et le comportement du sol non saturé. On présente aussi les travaux réalisés sur les sols non saturés, l'effet de la succion sur la compressibilité et la co

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20

Alshihabi, Omran Shahrour Isam Mieussens Claude. "Étude en laboratoire du comportement d'un sol compacté non saturé influence des cycles de séchage-humidification /." [S.l.] : [s.n.], 2002. http://www.univ-lille1.fr/bustl-grisemine/pdf/extheses/50376-2002-167-168.pdf.

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21

Thiel, Gregory P. "Entropy generation minimization of a heat and mass exchanger for use in a humidification-dehumidification desalination system." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/74945.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 93-97).<br>The physical mechanisms of entropy generation in a condenser with high fractions of non-condensable gases are examined using control volume, scaling, and boundary layer techniques, with the aim of defining a criterion for minimum entropy generation rate that is useful in engineering analyses. This process is particularly relevant in humidification-dehumidification desalination systems, where minimizing entrop

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22

Chehayeb, Karim Malek. "Numerical fixed-effectiveness and fixed-area models of the humidification dehumidification desalination system with air extractions and injections/." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/92147.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2014.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 101-104).<br>The humidification dehumidification (HDH) desalination system can be advantageous in small-scale, off-grid applications. This system is very robust and can tolerate a wide range of feed salinities, making it a good candidate for treating produced water from hydraulically fractured natural gas wells. The main drawback of this technology has been its low energy efficiency, which results in high water p

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23

Summers, Edward K. "High efficiency solar air heaters with novel built-in heat storage for use in a humidification-dehumidification desalination cycle." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/61921.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2010.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 129-135).<br>Compared to solar water heaters, solar air heaters have received relatively little investigation and have resulted in few commercial products. However, in the context of a Humidification-Dehumidification (HD) Desalination cycle air heating offers significant performance gains for the cycle. Solar collectors can be over 40% of an air-heated HDH system's cost, thus design optimization is crucial. Best design

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24

Seifert, Burkhard Sebastian [Verfasser], Thomas [Akademischer Betreuer] [Gutachter] Sattelmayer, and Philip A. [Gutachter] Davies. "Performance Improvements of Humidification-Dehumidification Desalination Systems with Natural Convection / Burkhard Sebastian Seifert ; Gutachter: Thomas Sattelmayer, Philip A. Davies ; Betreuer: Thomas Sattelmayer." München : Universitätsbibliothek der TU München, 2017. http://d-nb.info/1138027642/34.

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Maalouf, Chadi. "Étude du potentiel de rafraîchissement d'un système évaporatif à désorption avec régénération solaire." Phd thesis, Université de La Rochelle, 2006. http://tel.archives-ouvertes.fr/tel-00134779.

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Le développement de la climatisation lié notamment à l'amélioration des conditions de vie entraîne l'augmentation de la consommation énergétique avec tous ses effets néfastes sur l'environnement. Il est donc urgent de trouver des alternatives viables à la climatisation traditionnelle. Si l'optimisation de la conception architecturale permet une nette amélioration des conditions de confort, elle peut s'avérer incompatible avec les besoins des architectes ou elle atteint ses limites pendant les périodes de canicule. Dans ce cas, le concept de rafraîchissement évaporatif couplé à l'énergie solair

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Görling, Martin. "Turbomachinery in Biofuel Production." Licentiate thesis, KTH, Energiprocesser, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-28901.

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The aim for this study has been to evaluate the integration potential of turbo-machinery into the production processes of biofuels. The focus has been on bio-fuel produced via biomass gasification; mainly methanol and synthetic natural gas. The research has been divided into two parts; gas and steam turbine applications. Steam power generation has a given role within the fuel production process due to the large amounts of excess chemical reaction heat. However, large amounts of the steam produced are used within the production process and is thus not available for power production. Therefore,

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Badmaarag, Ulzii-Orshikh. "Optical Chemical Sensing Device for In-situ Non-Invasive Gas Monitoring." University of Cincinnati / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1583155117533193.

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Hassabou, Abdel Hakim [Verfasser], Wolfgang H. [Akademischer Betreuer] Polifke, and Abdalla [Akademischer Betreuer] Hanafi. "Experimental and Numerical Analysis of a PCM-Supported Humidification-Dehumidification Solar Desalination System / Abdel Hakim Hassabou. Gutachter: Abdalla Hanafi. Betreuer: Wolfgang H. Polifke." München : Universitätsbibliothek der TU München, 2011. http://d-nb.info/1029818797/34.

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Brahma, Abdelmalek. "Etude des variations dimensionnelles spontannes des sables-laitiers en cours d'hydratation." Toulouse 3, 1986. http://www.theses.fr/1986TOU30123.

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Etude de ces variations dimensionnelles sur deux types de melange confectionnes avec des sables de base presentant des coefficients de forme et de dimensions maximaux tres differents. Mesures effectuees sur des eprouvettes cylindriques dont la preparation a permis une bonne reproductibilite de l'homogeneite. Analyse de l'influence de divers parametres de composition, fabrication, nature de l'activant et conservation. Les sables-laitiers durcissant sans echanger de l'eau avec le milieu exterieur presentent generalement un gonflement. Celui-ci a deux composantes: restitution de l'energie de comp

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Makki, Lamis. "Comportement de retrait-gonflement des sols en période de sécheresse." Paris 6, 2009. http://www.theses.fr/2009PA066657.

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Ce mémoire est consacré à la description du comportement de retrait-gonflement des sols. Il analyse l’effet de plusieurs paramètres qui devraient être pris en compte dans la classification des sols pour le retrait et gonflement, tels que la densité, la teneur en carbonates et le nombre de cycles de séchage-humidification subis par le sol. Pour étudier le retrait volumique, un appareil automatisé a été développé au LCPC, pour mesurer simultanément les changements de volume du sol et les pertes d’eau lors du séchage. Des essais de retrait libre à l’air et de gonflement libre à l’œdomètre ont été

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FRANCOU, Cédric. "Stabilisation de la matière organique au cours du compostage de déchets urbains : influence de la nature des déchets et du procédé de compostage - recherche d'indicateurs pertinents." Phd thesis, INAPG (AgroParisTech), 2003. http://pastel.archives-ouvertes.fr/pastel-00000788.

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Le compostage est un procédé de traitement et de valorisation des déchets organiques qui reproduit en accéléré le processus d'humification de la matière organique (Mo) dans les sols. Actuellement en France, seulement 7 % des déchets urbains sont compostés, alors que la part organique représente 50 % des 47 millions de tonnes produites annuellement. Les composts sont avant tout utilisés en agriculture pour augmenter ou entretenir les teneurs en MO des sols, et le niveau de stabilité de leur MO conditionne leur comportement après incorporation au sol. Notre projet se proposait d'étudier l'évolut

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Taibi, Said. "Comportement mécanique et hydraulique des sols soumis à une pression interstitielle négative - Etude expérimentale et modélisation." Phd thesis, Ecole Centrale Paris, 1994. http://tel.archives-ouvertes.fr/tel-00257984.

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La thèse présente un ensemble de résultats expérimentaux sur des sols soumis à une pression interstitielle négative sur différents chemins : drainage- humidification, oedométrique, triaxial, etc... Ceux-ci mettent en évidence les différents domaines de comportement du sol et les aspects spécifiques du comportement dans chaque domaine : saturé, quasi-saturé faiblement saturé.<br />Parallèlement, une modélisation à partir d'arrangements réguliers de billes est proposée et validée par confrontation avec les résultats expérimentaux ; cette<br />approche permet d'expliquer un certain nombre de comp

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Fialho, Lucimar Lopes. "Caracterização da matéria orgânica em processo de compostagem por métodos convencionais e espectroscópicos." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/75/75132/tde-14042008-153813/.

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A produção de resíduos orgânicos tem aumentado em anos recentes e uma alternativa para o seu aproveitamento é o processo de compostagem, no qual se desenvolvem reações bioquímicas para estabilização do material que estão diretamente associadas com a humificação da matéria orgânica. Considerando a complexidade das transformações no processo de humificação e a importância de se conhecer com maior precisão estas reações e as características dos materiais gerados, foi proposto neste trabalho um estudo detalhado do processo de compostagem. A combinação de métodos convencionais e técnicas espectrosc

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Soemitro, Ria Asih Aryani. "Contribution à l'étude du rôle de la pression interstitielle négative dans le gonflement et d'autres aspects du comportement des sols non saturés." Châtenay-Malabry, Ecole centrale de Paris, 1994. http://www.theses.fr/1994ECAP0342.

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La présente thèse a pour objet d'étudier le comportement des sols lorsqu'ils sont soumis à une pression interstitielle négative ou une contrainte. La première partie est consacrée aux études bibliographiques générales sur l'effondrement et les sols gonflants. Le comportement des sols lors de cycle de dessiccation-humidification a été étudié pour avoir des informations sur le rôle de la structure des sols et les correspondances entre les paramètres des sols soumis à une pression interstitielle négative. Une étude du gonflement sur une montmorillonite compactée sous forte contrainte a été faite

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Rakotondratsima, Lee Yong Guy. "Mécanismes de gonflement et d'altération des schistes carton." Vandoeuvre-les-Nancy, INPL, 1995. http://www.theses.fr/1995INPL084N.

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Les schistes carton sont constitués par des marnes feuilletées d'apparence schisteuse et fortement surconsolidées. À l'état sain ils sont très compacts. À l'état altéré, ils deviennent très friables et se transforment en argile très plastique. Cette altération provoque deux types de problèmes en géotechnique: la stabilité des pentes et les désordres causés par le gonflement. L’altération et le gonflement des schistes carton s'effectuent en deux phases: la première phase d'altération par fissurations, provoque des gonflements indépendants de la présence des minéraux argileux et des déchargement

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Cavallius, Matilda, and Oskar Rehnstedt. "Befuktning : Installationer, processer och hälsofördelar." Thesis, KTH, Byggteknik och design, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-215298.

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Det finns tydliga hälsofördelar med en relativ fuktighet på 40–60% inomhus. Trots detta finns det idag inga direktiv på hur man ska styra den relativa fuktigheten inomhus. Många gånger diskuteras det kring avfuktning men i denna rapport tas befuktning upp ur ett hälsoperspektiv.I denna studie har det undersökts huruvida befuktningssystem skulle kunna användas i större utsträckning till fördel för människors hälsa.I rapporten redogörs för olika befuktningmetoder samt deras termofysiska processer - adiabatisk eller isotermisk. Dessutom undersöks vad som händer med energin i luften och vattenånga

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Taviche, Imad Khalil. "Pathologie des remblais routiers en milieux arides : cas de l'axe routier Nouakchott-Nouadhibou." Le Havre, 2011. http://www.theses.fr/2011LEHA0012.

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Le phénomène de fissuration des chaussées en Mauritanie a toujours inquiété les autorités mauritaniennes qui le considèrent comme un élément néfaste qui influe sur le développement du pays. Les fissures sont des dommages qui n'épargnent malheureusement aucun type de structures de chaussées durant leurs durée de vie, mais lorsque la dégradation de la chaussée est prématurée (le cas de la route Nouakchott-Nouadhibou (NKC-NDB) construite fin 2006), nous devons chercher d’abord à découvrir et à comprendre les causes principales de cette dégradation prématurée et ensuite déterminer une stratégie po

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Bowers, William Sonny II. "Effects of Heat and Moisture Exchangers Designed to Allow Aerosol Delivery on Airflow Resistance and Aerosol Deposition." Digital Archive @ GSU, 2010. http://digitalarchive.gsu.edu/rt_theses/11.

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Introduction: Several problems arise when HMEs are used while giving aerosolized medication including increased airway resistance (Raw) or the need to open the ventilator circuit. Recently, heat and moisture exchangers designed to allow aerosol delivery (HME-AD) have been developed to solve this problem, but no tests have been performed to confirm their effectiveness. The purpose of this study is to evaluate the effect of HME-ADs on aerosol deposition and Raw. Methods: An in-vitro lung model consisting of an 8.0 mm ID endotracheal tube (ETT) connected to a standard ventilator circuit and ve

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39

Ejjaaouani, Houssine. "Interactions des fondations et des sols gonflants : pathologie, calculs et études expérimentales." Phd thesis, Ecole des Ponts ParisTech, 2008. http://pastel.archives-ouvertes.fr/pastel-00005300.

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Ce mémoire comporte six chapitres. Le premier chapitre passe en revue les problèmes des sols argileux gonflants dans le monde et au Maroc, décrit leurs propriétés physiques et mécaniques, leur nature minéralogique et leur structure, en insistant sur leur comportement lors de l'humidification. Le deuxième chapitre analyse, sur la base des travaux de l'auteur, les différentes pathologies induites dans les bâtiments par le gonflement des sols argileux du Maroc. Les deux chapitres suivants portent sur le calcul des efforts dans les fondations superficielles et de leurs tassements ou gonflements :

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40

Lindström, Karl-Johan, and Anna Carling. "Aktiv befuktning vid mekaniskventilation : En integrerad litteraturstudie." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-48330.

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Introduktion: Befuktning vid mekanisk ventilation är nödvändigt för att inte skador skall uppstå i luftvägarna. Luften kan befuktas aktivt eller passivt och då tekniken ständigt utvecklas kan tidigare riktlinjer för vilken metod som är bäst behöva revideras. Syfte: Studiens syfte var att undersöka evidensen för användning av aktiv befuktning hos intuberade eller trakeostomerade patienter. Metod: I enlighet med Whittemore & Knafls metod utfördes en integrerad litteraturstudie. Litteratursökning gjordes i databaserna PubMed, CINAHL och Cochrane. Även en manuell sökning i referenslistor utför

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Revol, Philippe. "Caractérisation hydrodynamique des sols par infiltration bidimensionnelle axisymétrique et modélisation simplifiée de la micro-irrigation." Université Joseph Fourier (Grenoble ; 1971-2015), 1994. http://www.theses.fr/1994GRE10184.

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Les caracteristiques hydrodynamiques du sol jouent un role essentiel sur la repartition de l'eau en micro-irrigation, en particulier dans le cas d'une source ponctuelle. Il est donc important de pouvoir connaitre celles-ci facilement lorsqu'on s'interesse au dimensionnement et a la conduite des reseaux a la parcelle. La premiere partie de ce memoire presente une etude des principales methodes de caracterisation par infiltration axisymetrique qui sont actuellement en phase de developpement. Cette etude est effectuee a partir d'experimentations au champ et de la modelisation numerique et analyti

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Ghazali, Abu Baker Mhd. "Advanced controllers for building energy management systems : advanced controllers based on traditional mathematical methods (MIMO P+I, state-space, adaptive solutions with constraints) and intelligent solutions (fuzzy logic and genetic algorithms) are investigated for humidifying, ventilating and air-conditioning applications." Thesis, University of Bradford, 1996. http://hdl.handle.net/10454/4197.

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This thesis presents the design and implementation of control strategies for building energy management systems (BEMS). The controllers considered include the multi PI-loop controllers, state-space designs, constrained input and output MIMO adaptive controllers, fuzzy logic solutions and genetic algorithm techniques. The control performances of the designs developed using the various methods based on aspects such as regulation errors squared, energy consumptions and the settling periods are investigated for different designs. The aim of the control strategy is to regulate the room temperature

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Parackal, Bhavana. "An Investigation of Low Temperature Direct Propane Fuel Cells." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/35896.

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This research is directed toward the investigation of a low temperature direct propane fuel cell (DPFC). Modeling included a parametric study of a direct propane fuel cell using computational fluid dynamics (CFD), specifically FreeFem++ software. Polarization curves predicted by the CFD model were used to understand fuel cell performance. The predictions obtained from the computational fluid dynamics mathematical model for the fuel cell were compared with experimental results. The computational work identified some critical parameters (exchange current density, pressure, temperature) for impro

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Pospíšilová, Lucie. "Vzduchotechnika knihovny." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-372216.

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Dissertation offers a plan for air – conditioning equipment of library building in Brno and it involves air filter experimental measurement. The proposal is divided into three parts. The first part explains air filter theory with detailed description of atmospheric air filters for separation of particles for general ventilation - filter parameter determination. Theory part ends specifically with pocket air filters and their construction. The second part focuses on experimental pocket air filter measurement execution, which calculates with variable filter cartridges and pocket count. Measuremen

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Das, Geetanjali. "Evaluation of kneading compaction method and the long-term performances of lime-treated soils." Thesis, Ecole centrale de Nantes, 2021. http://www.theses.fr/2021ECDN0043.

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L'étude du comportement des sols traités à la chaux est axée sur l'analyse de l'influence des conditions de mise en œuvre en laboratoire et in situ avec une attention particulière sur l'évolution de la microstructure. Les échantillons de sol prélevés dans un remblai constitué d’un sol traité à la chaux, soumis à l'exposition atmosphérique pendant 7 ans, montrent une évolution significative des performances du matériau, notamment sa résistance à la compression. Ces résultats mettent en évidence l'influence du traitement à la chaux sur le long terme. Le remblai étudié a été mis en oeuvre par "co

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Silbernágl, Petr. "Adiabatické chlazení vzduchu." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-240137.

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The diploma thesis deals deals with the designing and assessment of the two variants of cooling and humidifying the air in the production hall for cotton in Humpolec. The system is proposed to fulfil hygienic, operational, economic and functional requirements for indoor microclimate of the production hall. The task of this system is the transport of cooler air to interior and the covering of heat gains all year round. The equipment is also designed for the regulation of air humidity in the interior. The theoretical part is devoted to air humidification and air humidification device. Calculatio

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Akpa-Vinceslas, Marthe. "Activité cellulolytique liée au tube digestif d'Eisenia fetida andrei. Impact sur la dynamique de la matière organique de déchets lignocellulosiques." Rouen, 1998. http://www.theses.fr/1998ROUES030.

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L'étude a permis de mettre en évidence une activité cellulolytique libre dans le tube digestif du lombricien Eisenia fetida andrei. Le système enzymatique complet d'hydrolyse de la cellulose y est présent. A l'aide de cultures organotypiques, il est montré que cette activité relève d'une synergie entre enzymes tissulaires et microbiennes et que les protozoaires ciliés inféodés au tube digestif n'ont pas de rôle dans cette activité. Des bactéries cellulolytiques et des bactéries ligninolytiques ont été isolées à partir du contenu du tube digestif. L'observation au microscope électronique à bala

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48

Ghazali, Abu Baker MHD. "Advanced controllers for building energy management systems. Advanced controllers based on traditional mathematical methods (MIMO P+I, state-space, adaptive solutions with constraints) and intelligent solutions (fuzzy logic and genetic algorithms) are investigated for humidifying, ventilating and air-conditioning applications." Thesis, University of Bradford, 1996. http://hdl.handle.net/10454/4197.

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This thesis presents the design and implementation of control strategies for building energy management systems (BEMS). The controllers considered include the multi PI-loop controllers, state-space designs, constrained input and output MIMO adaptive controllers, fuzzy logic solutions and genetic algorithm techniques. The control performances of the designs developed using the various methods based on aspects such as regulation errors squared, energy consumptions and the settling periods are investigated for different designs. The aim of the control strategy is to regulate the room temper

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Tayeb, Firas. "Underground gas storage thermodynamics : from laboratory to salt caverns." Electronic Thesis or Diss., Université Paris sciences et lettres, 2024. http://www.theses.fr/2024UPSLM005.

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L'usage croissant des énergies renouvelables nécessite des solutions avancées pour le stockage de l'énergie pour aborder efficacement les difficultés causées par leur approvisionnement fluctuant et intermittent. Cette étude se concentre sur le stockage souterrain de gaz dans les cavités salines, une solution prometteuse pour résoudre ces défis. Dans une première étape, des études expérimentales sont menées pour étudier la cinétique de dissolution du CO2 et du H2 dans l'eau pure et la saumure en utilisant la méthode de Pressure-decay. Ces études incluent également la mesure de l'humidité des ga

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Nguyen, Ngoc diep. "Characterization and contribution of colloidal fraction in the mobility and bioavailability of sedimentary phosphorus." Thesis, Limoges, 2020. http://aurore.unilim.fr/theses/nxfile/default/9f8fcb76-5d28-468c-8289-23bd366f1bb7/blobholder:0/2020LIMO0078.pdf.

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Le relargage de phosphore sédimentaire constitue une source interne de nutriments dans les eaux conduisant à l’eutrophisation des milieux aquatiques, en particulier des retenues. Les connaissances actuelles concernant le relargage du P sédimentaire ne tiennent pas compte de la fraction colloïdale, qui est pourtant considérée comme une importante phase porteuse de P, très mobile et potentiellement biodisponible. Cette thèse souligne le rôle majeur des colloïdes sédimentaires vis-à-vis de leur teneur en phosphore ainsi que leur fort potentiel à être mobilisé dans l’eau. Il a été démontré que les

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