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Tesis sobre el tema "UCST in water"

Autor: Grafiati

Publicado: 25 de mayo de 2024

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Pineda, Contreras Beatriz Amanda [Verfasser] y Seema [Akademischer Betreuer] Agarwal. "Basic Studies of UCST Polymers in Water and their Processing as Films and Fibers / Beatriz Amanda Pineda-Contreras ; Betreuer: Seema Agarwal". Bayreuth : Universität Bayreuth, 2017. http://d-nb.info/1136017496/34.

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Audureau, Nicolas. "Synthèse de (co)polymères à UCST par polymérisation radicalaire contrôlée par RAFT et étude de leur thermosensibilité dans l’eau". Electronic Thesis or Diss., Sorbonne université, 2021. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2021SORUS299.pdf.

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Depuis une dizaine d'années, les polymères ayant un comportement à UCST dans l'eau suscitent de plus en plus d’intérêt. Parmi eux, le poly(acrylamide-co-acrylonitrile) (P(Am- co-AN)) et le poly(N-acryloyl glucinamide) sont les plus populaires. Ils ont principalement été étudiés pour développer de nouveaux systèmes intélligents destinés à des applications biomédicales. Cependant, la reproductibilité de leur synthèse pour obtenir un polymère ayant une température de transition de phase (TCP) donnée n’est pas toujours aisée. Dans ce travail de thèse, nous avons dans un premier temps complété les études sur le P(Am-co-AN) décrites dans la littérature en réalisant sa synthèse dans l’eau par polymérisation radicalaire contrôlée par RAFT. Nous avons ensuite développé une nouvelle famille de (co)polymères à base d’acrylamide de N-cyanométhyle (CMAm) ou d’acrylamide de N-cyanoéthyle (CEAm) présentant un comportement de type UCST dans l’eau couvrant une très large gamme de TCP accessibles (~20-85 °C). De plus, nous avons synthétisé dans l’eau des copolymères à blocs à base des différents (co)polymères à UCST via le procédé PISA-RAFT en utilisant des macro-agents RAFT hydrophiles à base de poly(acrylamide de N,N-diméthyle) (PDMAc). Ce procédé nous a permis d’obtenir des nano-objets thermosensibles de différentes morphologies. Dans le cas des PDMAc-b-P(Am-co-AN), nous avons montré l’existence d’une transition morphologique fibres/sphères partiellement réversible, induite par le chauffage du milieu. Dans le cas des copolymères PDMAc-b-PCMAm, nous avons pu synthétiser -avec un bon contrôle- une large gamme de morphologies (sphères, fibres et vésicules)
Over the past decade, polymers exhibiting a UCST type behavior in water have gained more and more interest. Among them, poly(acrylamide-co-acrylonitrile) (P(Am-co-AN)) and poly(N- acryloyl glucinamide) are the most popular. They have been mainly studied for the develoment of new smart systems for biomedical applications. Yet, reproductibility of their synthesis to obtain polymers with the targeted phase transition temperature (TCP) is not always straightforward. In this thesis, we firstly completed previous studies available in the litterature on P(Am-co-AN) by synthesizing it in water using RAFT-controlled radical polymerization. We also developed a new familly of (co)polymers based on N-cyanomethylacrylamide (CMAm) and N-cyanoethylacrylamide (CEAm) exhibiting a UCST-type behavior in water covering a very large range of TCP (~20-85 °C). Moreover, we have shown that block copolymers composed of the former UCST type (co)polymers could be achieved with good polymerization control in water via the PISA-RAFT process using a poly(N,N- dimethylacrylamide) (PDMAc) macroRAFT agent. The process allowed us to obtain thermoresponsive nano-objects of different morpholgies. Remarkably, in the case of PDMAc-b-P(Am- co-AN), we have shown the existence of a partially reversible worms-to-spheres morphological transition induced by heating of the medium. In the case of PDMAc-b-PCMAm diblock copolymers, we have shown that a large range of morphologies, namely spheres, worms and vesicles, was accessible

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Jackson, Steven J. "Building the virtual river : numbers, models, and the politics of water in California /". Diss., Connect to a 24 p. preview or request complete full text in PDF formate. Access restricted to UC campuses, 2005. http://wwwlib.umi.com/cr/ucsd/fullcit?p3212684.

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O'Hara, Jeffrey Keith. "Water resources planning under climate change and variability". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2007. http://wwwlib.umi.com/cr/ucsd/fullcit?p3259069.

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Thesis (Ph. D.)--University of California, San Diego, 2007.
Title from first page of PDF file (viewed June 21, 2007). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references.

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Daniels, Mark J. "Characterization of water channel proteins (Aquaporins) in plants /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1997. http://wwwlib.umi.com/cr/ucsd/fullcit?p9735273.

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Conant, William Christopher. "Interactions between aerosol, water vapor, and solar radiation /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2000. http://wwwlib.umi.com/cr/ucsd/fullcit?p3025938.

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Terrill, Eric J. "Acoustic measurements of air entrainment by breaking waves /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1998. http://wwwlib.umi.com/cr/ucsd/fullcit?p9907829.

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Ruane, Alexander C. "Diurnal to annual variations in the atmospheric water cycle". Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2007. http://wwwlib.umi.com/cr/ucsd/fullcit?p3263195.

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Thesis (Ph. D.)--University of California, San Diego, 2007.
Title from first page of PDF file (viewed July 10, 2007). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 146-154).

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Hahn, Thomas R. "Low-frequency acoustic emissions of a plunging water jet /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC IP addresses, 1999. http://wwwlib.umi.com/cr/ucsd/fullcit?p9944224.

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Boime, Eric I. "Fluid boundaries : Southern California, Baja California, and the conflict over the Colorado River, 1848-1944 /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2002. http://wwwlib.umi.com/cr/ucsd/fullcit?p3071055.

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Sjöstrand, Alexandra. "Optimering av biologisk fosfor och kvävereduktion i ett reningsverk för hushållsspillvatten". Thesis, Uppsala University, Department of Earth Sciences, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-88844.

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In connection with Henriksdals wastewater treatment plant (WWTP) a smaller plant is situated called Sjöstadsverket where new methods for wastewater treatment are tested and evaluated in different process lines. On one of the lines experiments with enhanced biological phosphorous removal (EBPR), have been carried out to evaluate if it is a good alternative to traditional chemical phosphorus removal. This thesis evaluates the results from the experiments conducted during fall 2005.

The incoming water from Hammarby Sjöstad consists of only household wastewater, which gives a wastewater with high concentrations of nutrients and organic carbon. This is partly positive, because one of the limiting factors for effective biological phosphorus removal is the lack of easily biodegradable organic carbon. The high concentrations of ammonium and phosphorus demand a high reduction to achieve the requirements of outgoing concentration.

To optimize the process experiments with different recirculations and different aeration techniques have been made. The experiments have shown that it is possible to obtain good results, with periods of very low outgoing phosphorus concentrations below 0,15 mg/L. It was, however, hard to obtain a stable process and to keep a good sludge quality during the period.

Primary sludge was hydrolysed to increase the amount of easily degradable organic material into the biological step of the process. The hydrolyse had a high efficiency during the test period, but with big variations. The most desirable fraction of organic material, VFA, increased to approximately 1500 mg/L during the best periods. This is only 9 % of the amount VFA in the primary sedimentation, but could be increased with a higher flux.

When the bioP sludge is fermented as a part of sludge treatment, a supernatant from digester sludge with high concentrations of phosphorus is received. To avoid to return phosphor into the activated sludge process and to recycle phosphorus, experiments with phosphorus precipitation were made. By using struvite precipitation up to 92 % of the phosphorus in the supernatant was reduced and precipitated. This was 12 % of the total amount of incoming phosphourus and was achieved at a pH just over 9 in the experiment tank and a Mg:P quote of 1:1.

I anslutning till Henriksdal’s reningsverk ligger Sjöstadsverket som är ett mindre reningsverk där nya reningsmetoder testas och utvärderas i på ett antal olika försökslinjer. På en av linjerna har försök med biologisk fosforrening, även kallat BioP, utförts för att undersöka om det är ett alternativ till konventionell kemisk rening av fosfor. Detta arbete sammanfattar resultaten från de experiment som utförts under hösten 2005.

I Hammarby Sjöstad, som förser Sjöstadsverket med avloppsvatten, separeras dag och spillvatten, vilket bidrar till ett näringsrikt vatten med en hög halt organiskt material. Detta är delvis positivt, då en av de begränsande faktorerna för en effektiv biologisk fosforrening är bristen på lättillgängligt organiskt material. De höga halterna inkommande fosfor och kväve kräver dock en högre reningsgrad för att de stränga utsläppsmålen ska nås. För att optimera processen har försök med olika inställningar på recirkulationsgrader genomförts och försök med olika luftningsstrategier. Försöksperioden har visat att det går att få mycket bra resultat, med periodvis utgående fosfathalter under 0,15 mg/L. Det har dock varit svårt att få en stabil process och behålla en bra slamkvalitet under hela försöksperioden.

Primärslam från försedimenteringen har hydrolyserats för att öka mängden lättillgängligt organiskt material in till det biologiska reningssteget. Hydrolysen fungerade bra under hela försöksperioden, dock med stora variationer. Den mest önskvärda fraktionen lättillgängligt organiskt material, VFA, hade under de bästa perioderna ökat till ca 1500 mg/L i hydrolysen. Detta utgör approximativt 9 % av mängden VFA i försedimenteringen, men skulle kunna ökas vid ett större flöde.

Då BioP-slammet rötas som en del av slambehandlingen fås ett fosforrikt rejektvatten. För att undvika att få in fosfor till aktivslamprocessen och för att ta till vara på fosfor som näringsämne har försök med fosforåtervinning från rejektvatten gjorts. Genom att använda sig av struvitfällning kunde upp till 92 % av fosforn i rejektvattnet reduceras och fällas ut. Detta motsvarar 12 % av den totala inkommande fosforhalten och uppnåddes vid pH strax över 9 i struvitfällningstanken och med en Mg:P kvot på 1:1.

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Strathman, Theodore Andrew. "Dream of a big city : water politics and San Diego County growth, 1910-1947 /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2005. http://wwwlib.umi.com/cr/ucsd/fullcit?p3169320.

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Schram, Ryan. "Feast of water Christianity and the economic transformation of a Melanesian society /". Diss., [La Jolla] : University of California, San Diego, 2009. http://wwwlib.umi.com/cr/ucsd/fullcit?p3369402.

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Thesis (Ph. D.)--University of California, San Diego, 2009.
Title from first page of PDF file (viewed September 17, 2009). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 354-371).

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Gallaudet, Timothy C. "Shallow water acoustic backscatter and reverberation measurements using a 68-kHz cylindrical array /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2001. http://wwwlib.umi.com/cr/ucsd/fullcit?p3035902.

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Veron, Fabrice. "Turbulent mixing at the surface of natural water bodies : breaking waves and Langmuir circulations /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2000. http://wwwlib.umi.com/cr/ucsd/fullcit?p3035438.

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Lin, Hsiu-Chin. "Evolution of the suborder Blennioidei phylogeny and phylogeography of a shallow water fish clade /". Diss., [La Jolla] : University of California, San Diego, 2009. http://wwwlib.umi.com/cr/ucsd/fullcit?p3386628.

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Thesis (Ph. D.)--University of California, San Diego, 2009.
Title from first page of PDF file (viewed Jan. 14, 2010). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references.

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Sokolov, Roman. "Convection in ethanol-water mixtures in the large negative separation ratio and non-Boussinesq regimes /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC IP addresses, 2005. http://wwwlib.umi.com/cr/ucsd/fullcit?p3167815.

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Russell, Joellen Louise. "The biogeochemistry of southern ocean intermediate and mode waters /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1999. http://wwwlib.umi.com/cr/ucsd/fullcit?p3035925.

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Kim, Katherine Haekyung. "Source detection and localization performance of matched field processors in a real and uncertain, shallow water, ocean environment /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2002. http://wwwlib.umi.com/cr/ucsd/fullcit?p3055787.

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Brambilla, Elena. "The upper limb of the North Atlantic overturning circulation investigation of the subtropical-subpolar gyre exchange and Subpolar Mode Water /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2006. http://wwwlib.umi.com/cr/ucsd/fullcit?p3237551.

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Thesis (Ph. D.)--University of California, San Diego, 2006.
Title from first page of PDF file (viewed December 12, 2006). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references.

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Mages, Phillip. "III-V to Si wafer fusion for the fused Si/InGaAs avalanche photodiode /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2003. http://wwwlib.umi.com/cr/ucsd/fullcit?p3090440.

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Mortyn, Peter Graham. "Planktonic foraminifera and upper water column variability in the South Atlantic : a multiple species approach to the deep sea sedimentary record of climate change /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2000. http://wwwlib.umi.com/cr/ucsd/fullcit?p3035424.

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Min, Dong-Ha. "Studies of large-scale intermediate and deep water circulation and ventilation in the North Atlantic, South Indian and Northeast Pacific Oceans, and in the East Sea (Sea of Japan), using chlorofluorocarbons as tracers /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1999. http://wwwlib.umi.com/cr/ucsd/fullcit?p3035926.

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