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Rozprawy doktorskie na temat „Salt gradient”

Autor: Grafiati

Data publikacji: 3 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

Al-Saleh, N. "A salt gradient solar pond for heat collection and long term storage." Thesis, University of Sussex, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375133.

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A salt gradient solar pond offers an economical means of both collecting summer solar heat, and storing it in water over periods of a few months for use in winter space heating. The vertical gradient of salt density prevents convection in the pond and makes it self-insulating against heat losses. The solar pond project at the university of Sussex aimed to study the design, construction, filling, and operation of a salt gradient solar pond, and to develop inexpensive instrumentation for the harsh environment of hot salt water solution, for monitoring behaviour and performance. A new method of h

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Foust, Christy M. "Population Genetics and Epigenetics of Two Salt Marsh Plant Species along an Environmental Gradient." Scholar Commons, 2015. http://scholarcommons.usf.edu/etd/5947.

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Phenotypic plasticity is the ability of a given genotype to exhibit different phenotypes in response to environmental variables, which can impact population level processes. Plasticity of ecologically-relevant traits is important to an organism’s environmental response; however, the underlying mechanisms of plasticity are largely unknown. Ecological epigenetics may offer mechanisms (e.g. DNA methylation) underlying phenotypic plasticity. Epigenetics can be defined as the underlying molecular mechanisms that allow one genotype to exhibit different phenotypes. Differential DNA methylation is one

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3

Castagna, Salvatore. "Thermo hydraulic behaviour of unstaturated salt aggregates." Doctoral thesis, Universitat Politècnica de Catalunya, 2007. http://hdl.handle.net/10803/6246.

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En el siglo pasado se ha desarrollado una nueva energía: la nuclear. Su aplicación comprende tanto el campo militar como el campo civil. Unos de los aspectos más interesantes es el uso de esta energía para la producción de electricidad de uso civil. <br/>El combustible nuclear es de larga duración: unas barras de uranio pueden llegar a producir energía eléctrica durante una década aproximadamente. Sin embargo, a mediados del siglo pasado se planteó el problema de los residuos nucleares. Este problema es muy complejo por que, aunque la duración del combustible sea de una década, el periodo de d

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Afeef, M. "Salt gradient solar ponds and desalination with particular reference to the absorbtion of solar radiation in salt solutions, and application in Saudi Arabia." Thesis, University of Reading, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370352.

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Albarracin, Maria Teresa. "Bottom-up and top-down effects on insects herbivores along a natural salinity gradient in a florida salt marsh." [Tampa, Fla.] : University of South Florida, 2005. http://purl.fcla.edu/fcla/etd/SFE0001002.

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Keammerer, Holly Barton 1983. "Community structure, plant interactions, seedling performance and seed bank composition of salt marshes along an estuarine gradient in Coos Bay, Oregon." Thesis, University of Oregon, 2011. http://hdl.handle.net/1794/11256.

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xviii, 160 p. : ill. (some col.)<br>Salt marshes are intertidal communities dominated by halophytic vascular plants that are subjected periodically to tidal inundation. These species have developed various adaptations to this stress, including tolerances of fluctuating salinity, extended periods of inundation and intervals of anoxic conditions. The marshes are divided into zones of different plant communities based on species' tolerances of ambient estuarine conditions. Abiotic stresses change along the estuarine salinity gradient (marine to riverine), potentially altering development and c

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Brassieur, David Aaron. "An Investigation Into the Origin, Composition, and Commercial Significance of a Sedimentary Subsalt Formation: Keathley Canyon, Gulf of Mexico." ScholarWorks@UNO, 2016. http://scholarworks.uno.edu/td/2245.

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Sub-salt oil and gas formations in deep-water northern Gulf of Mexico are high priority targets. Advances in seismic processing allow for high-resolution, below-salt imaging. Understanding the modes of salt emplacement provide insight into sub-salt traps and potential drilling hazards. A sub-salt sedimentary unit lies in the Keathley Canyon protraction. Autosutures created the transport-parallel lineaments of the upper surface of the unit. In addition, highly variable sediment aggradation rates created ramps, flats, and basal cutoffs along the base of the allochthon as salt and sediment compet

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8

Maloney, Caitlin E. "The effects of micronutrient additions on soil invertebrate activity and community structure along a successional gradient." Bowling Green State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1498074605780196.

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Kanan, Safwan. "Modelling of a solar pond as a combined heat source and store to drive an absorption cooling system for a building in Iraq." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/modelling-of-a-solar-pond-as-a-combined-heat-source-and-store-to-drive-an-absorption-cooling-system-for-a-building-in-iraq(1d356a21-e8ab-4491-9ebb-3be2caf0f092).html.

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This research studies the performance of a salinity gradient solar pond driving an absorption cooling system, as an alternative to a conventional electrically powered cooling system, to provide cool air for a modern single family house in the hot dry climate of Baghdad, Iraq. The system comprises a salinity gradient solar pond, a hot-water-fired absorption water chiller, a chilled-water cooling coil which cools the air in the house, and a cooling tower which rejects heat to the ambient air. Hot brine from the pond circulates through a heat exchanger, where it heats water that is then pumped to

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10

Schober, Benjamin. "Membrane Stratified Solar Ponds." Thesis, University of Gävle, Faculty of Engineering and Sustainable Development, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-7083.

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<p>This project deals with the potential of membrane stratified solar ponds which consist of two water layers, where one is a salt solution here, and a separating translucent membrane. An experimental pond was set up to study the thermal behaviour of such collector systems. The input is mainly solar radiation, sometimes when the ambient temperatures are higher than the pond temperatures also heat from the environment is transferred into the pond.</p><p>The measured temperatures of the pond, the ambient temperature, the global radiation and wind speed were the basis data for thermal calculation

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11

Ellila, Georg. "Capillary forces and osmotic gradients in salt water - oil systems." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for kjemi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18859.

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This project looks at the capillary systems with salt water and oil that can be found in porous stones in oil reservoir. The interactions between the different phases and how salt concentration differences can move the oil. The first problem was to find how the water migrates from one side of an oil droplet to the other due to the concentration difference. This was discussed, but not experimentally verified. The reason for this is the high inaccuracy of the experiments and the lack of knowledge before starting. However, this project gives a lot of important knowledge about the problem, and goo

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12

Soulié, Virginie. "Sessile Droplets of Salt Solutions on Inert and Metallic Surfaces : Influence of Salt Concentration Gradients on Evaporation and Corrosion Behaviour." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS129/document.

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Dans cette thèse, la dynamique d'évaporation de gouttes sessiles de solutions salines sur des surfaces planes inertes et métalliques a été étudiée et le phénomène de corrosion pour les surfaces ferriques caractérisé. En premier lieu, nous nous sommes intéressés à la dynamique d'évaporation de gouttes sessiles salées sur des surfaces inertes pour une large gamme de concentrations en sel, d'humidité relatives, de tailles de goutte et d'angles de contact. Notre étude révèle les domaines de validité du modèle classique d'évaporation, processus contrôlé par la diffusion de la vapeur dans l'air et m

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13

Olivella, Pastallé Sebastià. "Nomsothermal multiphase flow of brine and gas through saline media." Doctoral thesis, Universitat Politècnica de Catalunya, 1995. http://hdl.handle.net/10803/6261.

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Presentamos una formulación nueva para el análisis de problemas Termo-hidro-mecánicos en medios salinos. Esta formulación incluye, desde la obtención de ecuaciones de balance de masa, momento y energía hasta su resolución numérica, incluyendo la derivación de algunas ecuaciones constitutivas. El programa de calculo resultante (Code Bright) puede usarse para analizar problemas reales de sistemas de sellado construidos con agregados porosos de sal, que era la motivación original de este trabajo.<br/><br/>Las ecuaciones de balance se han formulado teniendo en cuenta que en un medio salino existen

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14

Douar, Adnane. "Recherche de matériaux isolants pour la conception d'une nouvelle génération de connecteurs électriques haute tension : influence de la pollution sur les phénomènes de décharges partielles du contournement et de claquage." Thesis, Ecully, Ecole centrale de Lyon, 2014. http://www.theses.fr/2014ECDL0046/document.

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Dans le présent travail, nous abordons une problématique essentielle liée aux accessoires des lignes électriques et plus particulièrement au connecteur à perforation d’isolant (TTDC 45501 FA), commercialisé par la société Sicame située à Arnac-Pompadour (Corrèze). Ce produit permet d’effectuer des dérivations de courant en moyenne tension gainé HTA entre 15 et 25kV. Cependant, il devient nécessaire de concevoir une nouvelle génération de connecteurs capable de fonctionner à une tension de 52 kV en raison de la constante augmentation des besoins en électricité. En réalité, le principal souci co

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15

Soulié, Virginie [Verfasser], and Helmuth [Akademischer Betreuer] Moehwald. "Sessile droplets of salt solutions on inert and metallic surfaces : influence of salt concentration gradients on evaporation and corrosion behaviour / Virginie Soulié ; Betreuer: Helmuth Moehwald ; Université de Montpellier." Potsdam : Universität Potsdam, 2015. http://d-nb.info/1218400641/34.

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16

Galian, Gay Laura. "Estenosis aórtica severa de bajo flujo y bajo gradiente con fracción de eyección normal: Prevalencia, características, pronóstico e historia natural." Doctoral thesis, Universitat Autònoma de Barcelona, 2020. http://hdl.handle.net/10803/670516.

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Introducció: L’estenosi aòrtica (EAo) de baix flux i baix gradient (BF/BG) amb fracció d’ejecció del ventricle esquerre (FEVE) normal és una entitat que s’ha associat amb un pitjor pronòstic que l’EAo d’elevat gradient (EG); tot i això, diferents estudis i recents meta-anàlisis posen en dubte els resultats previs. Objectiu: Determinar el risc de mortalitat i/o necessitat de cirurgia/TAVI en els pacients amb EAo severa amb BF/BG i FEVE conservada en comparació amb l’EAo severa amb flux normal i baix gradient (NF/BG) i amb EG. Materials i mètodes: Estudi observacional longitudinal retrospecti

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17

Lopez, Marco Ana. "Low-flow low-gradient aortic stenosis: outcomes after aortic valve replacement." Doctoral thesis, Universitat de Barcelona, 2019. http://hdl.handle.net/10803/667817.

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Aortic stenosis is the commonest valve disorder in the Western World. The natural history of the disease is very well described; with a decreased survival once symptoms occur. There is currently, no medical therapy available to reduce the natural progression of the aortic stenosis, and therefore, aortic valve replacement has been recognised as the standard of care treatment for symptomatic aortic stenosis, with TAVI having merged as alternative for those cases with high/prohibitive surgical risk. All types of aortic stenosis have in common a reduced valve area (AVA <1.0cm2), but depending o

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18

Mokni, Nadia. "Deformation and flow driven by osmotic processes in porous materials." Doctoral thesis, Universitat Politècnica de Catalunya, 2011. http://hdl.handle.net/10803/6279.

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En el caso del almacenamiento de los residuos radioactivos los flujos osmóticos pueden ser relevantes y requieren un análisis en detalle. El residuo nuclear bituminizado (BW) será almacenado mediante contenedores en cavidades excavadas en la Boom Clay, que es una arcilla marina que presenta propiedades favorables para limitar y retrasar la migración de los contaminantes radioactivos. La interacción entre los dos materiales es un proceso acoplado químico-hidro-mecánico y depende de la respuesta hidromecánica de la Boom Clay y del BW. En condiciones de almacenamiento, el contacto del BW, que con

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19

Perriquet, Marie. "Characterization of the hydrodynamics and saltwater wedge variations in a coastal karst aquifer in response to tide and precipitation events (Bell Harbour catchment, Co. Clare, Ireland)." Thesis, Montpellier 2, 2014. http://www.theses.fr/2014MON20042/document.

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La côte ouest irlandaise située dans les comtés de Clare et Galway est depuis récemment affectée par une augmentation de la fréquence des inondations et une montée du niveau marin. L'impact de ces changements climatiques se fait particulièrement ressentir au niveau des aquifères karstiques côtiers de ces régions, tel que le bassin karstique de Bell Harbour (~50 km²) sélectionné dans le cadre de ce projet: le positionnement d'un biseau salé dans cet aquifère est clairement dû à l'interaction entre sa recharge liée aux événements pluvieux et la forte influence de la marée. Des données (niveaux d

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20

Neupert, Markus. "Structuratiοn des cοmmunautés végétales de marais οligοhalins en répοnse aux variatiοns des gradients d'inοndatiοn et de salinité en estuaire de Seine". Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMR016.

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À l’échelle mondiale, les activités humaines émettrices de gaz à effet de serre sont en train de modifier le fonctionnement climatique de la planète.Les zones humides côtières sont identifiées comme des milieux très vulnérables aux effets liés au changement climatique, notamment le rehaussementdu niveau marin, l’acidification de l’océan, l’augmentation des températures et la modification de la distribution des précipitations. Dans ce contexte,les gradients d’inondation et de salinité des estuaires et de leurs milieux humides sont alors susceptibles de changer dans le temps et l’espace, avec de

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21

Gerzaguet, Robin. "Méthodes de traitement numérique du signal pour l'annulation d'auto-interférences dans un terminal mobile." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GRENT014/document.

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Les émetteurs-récepteurs actuels tendent à devenir multi-standards c’est-àdireque plusieurs standards de communication peuvent cohabiter sur la même puce. Lespuces sont donc amenées à traiter des signaux de formes très différentes, et les composantsanalogiques subissent des contraintes de conception de plus en plus fortes associées au supportdes différentes normes. Les auto-interférences, c’est à dire les interférences généréespar le système lui-même, sont donc de plus en plus présentes, et de plus en plus problématiquesdans les architectures actuelles. Ces travaux s’inscrivent dans le paradig

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王漢慶. "Numerical simulation and optimal considerations on salt gradient solar ponds." Thesis, 1986. http://ndltd.ncl.edu.tw/handle/76703839963892802436.

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Dutta, Partha. "Soil community analysis along a salt gradient using denaturing gradient gel electrophoresis of PCR-amplified 16s rRNA genes." Thesis, 2006. http://hdl.handle.net/10057/369.

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Many studies of hyper saline environments have been performed, mainly on aquatic systems. However, the microbial community in terrestrial thallasohaline environments has not been studied extensively. To our knowledge, this is the first study of a natural terrestrial thallasohaline environment using polymerase chain reaction (PCR) and denaturing gradient gel electrophoresis (DGGE). We studied the great salt plains (GSP) for this purpose. The GSP is a perfect example of an extreme environment. The environment of the GSP changes frequently due to rain events that can change the salinity of the so

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Wanner, Antonia [Verfasser]. "Management, biodiversity and restoration potential of salt grassland vegetation of the Baltic Sea : analyses along a complex ecological gradient / Antonia Wanner." 2009. http://d-nb.info/1002327008/34.

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Murad, Idris. "Detection of Gas Hydrates in Garden Banks and Keathley Canyon from Seismic Data." Thesis, 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-343.

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Gas hydrate is a potential energy source that has recently been the subject of much academic and industrial research. The search for deep-water gas hydrate involves many challenges that are especially apparent in the northwestern Gulf of Mexico, where the sub-seafloor is a complex structure of shallow salt diapirs and sheets underlying heavily deformed shallow sediments and surrounding diverse minibasins. Here, we consider the effect these structural factors have on gas hydrate occurrence in Garden Banks and Keathley Canyon blocks of the Gulf of Mexico. This was accomplished by first mapping t

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Ray, Karen Louise. "Tamarix species (salt cedar) stem density along fluvial and salinity gradients on the salt plains national wildlife refuge." 2010. http://digital.library.okstate.edu/etd/Ray_okstate_0664M_10881.pdf.

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Bonner, Chrisdon Brooke. "Vegetation composition along salinity gradients at the Salt Plains National Wildlife Refuge, Alfalfa County, Oklahoma." 2008. http://digital.library.okstate.edu/etd/Bonner_okstate_0664M_10155.pdf.

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Pestana, Sara Lopes. "Present-day thermal regime of the Pre-Salt of the Santos Basin, Brasil." Master's thesis, 2018. http://hdl.handle.net/10451/33940.

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Tese de mestrado, Geologia (Estratigrafia, Sedimentologia e Paleontologia) Universidade de Lisboa, Faculdade de Ciências, 2018<br>The industry of oil and gas is in constant transformation, controlled by technological and economic factors as well as scientific knowledge. Due to this everlasting industrial development and growth, especially in the last two decades, location and exploration methods are more precise and reliable, thus new locations for economic hydrocarbons accumulations are becoming scarce. Considering this fact, is of the utmost importance to search for new occurrences in econom

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