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Dissertations / Theses on the topic 'PVAm'

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Published: 4 June 2021
Last updated: 1 February 2022

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1

Berstad, Eivind. "Testing and Optimization of PVAm/PVA Blend Membranes for Biogas Upgrading." Thesis, Norges Teknisk-Naturvitenskaplige Universitet, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-21058.

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Membrane technology is an energy saving, environment friendly and low cost separation technology. This master’s thesis has focused on testing and optimization of polyvinylamine/polyvinylalcohol (PVAm/PVA) blend fixed-site-carrier (FSC) membranes on polysulfone supports for separation of carbon dioxide (CO2) and methane (CH4). Permeation tests, process simulation and cost estimation were applied to evaluate CO2/CH4 separation performance and process feasibility for biogas upgrading. Utilization of biogas as a natural gas substitute or as vehicle fuel can contribute to reduced greenhouse ga
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2

Johannessen, Petra-Kristine. "Preparation of PVAm/PSf composite hollow fibers for flue gas applications." Thesis, Norges Teknisk-Naturvitenskaplige Universitet, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-21105.

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Polysulfone (PSf) hollow fibres as support for Fixed-Site-Carrier (FSC) polyvinylamine(PVAm)/PSf composite membranes used for CO2 capture were attempted optimized by increasing the air gap and take-up speed during spinning. The goal was to produce fibres with a porous structure, a high CO2 permeance, as few macrovoids and surface defects as possible. Most of the produced fibres coated with polydimethylsiloxane (PDMS) showed high CO2 permeance but low CO2/N2 selectivity. This is most likely caused by big holes and defects present on the PSf fibre surface. The reason for these defects was determ
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3

Firouznia, Elham. "Fabrication and Characterization of Nanocellulose-PVAm, Hydrophilic Membranes for CO2 Separation." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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Greenhouse gases (GHGs) emission is currently one the main global issues that draws a large amount of attentions by scientists and researchers. Among different strategies for tackling this obstacle, Gas separation membranes are one of the recently proposed solutions for CO2 separation. Membrane due to its ability to control the permeation of different species could be an appropriate technology to recover CO2 molecules as the permeant. Between different categories of membranes, the hydrophilic facilitated transport membranes are the focus on this research; they are indeed a very promising to ov
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4

Bigliardi, Brando. "Study of PVAm-graphene selective layer on PES membrane for gas separation." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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Many studies focused on the improvement of membrane performance by addition of nanofiller creating the so-called mixed matrix membranes. In this work, the feasibility of producing a multi-layer selective membrane for carbon dioxide separation is analysed. Two different deposition technique, 2-D printing and Mayer bar deposition, were explored. The multi-layer membranes were composed by a support layer of polyethersulfone and a selective layer of polyvinyl amine and graphene. Some consideration about ink formulation for 2-D printing were also developed in this work.
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Bianchi, Stefano. "Studio dell’effetto di stabilizzanti polimerici su catalizzatori di oro nanostrutturati." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23161/.

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Negli ultimi anni ha riscosso particolare interesse l’utilizzo di nanoparticelle metalliche nella catalisi per via delle loro eccellenti proprietà. Le limitazioni al loro utilizzo sono connesse alla complessità della loro sintesi a causa dei molteplici parametri che possono influenzare le proprietà e la morfologia del sistema finale. Recenti studi hanno permesso di individuare la possibilità che polimeri con opportune caratteristiche possano influenzare sia la morfologia che l’attività catalitica dei catalizzatori nanostruturati. Queste ricerche hanno aperto alla possibilità di controllare le
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6

Salem, Tarek Sayed Mohamed. "Plasma-based surface modifications of polyester fabrics and their interaction with cationic polyelectrolytes and anionic dyes." Doctoral thesis, Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-83580.

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Plasma-based surface modifications offer many interesting possibilities for the production of high value-added polymeric materials. In this work, different plasma-based synthetic concepts were employed to endow poly(ethylene terephthalate) (PET) fabrics with accessible amine functionalities. These concepts were compared to find out the appropriate engineering methods, which can be further accepted by textile industries to overcome the limited reactivity of PET fabric surfaces, while the bulk characteristics are kept unaffected. Amine functionalities were introduced onto the surface of PET fabr
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7

Brunelli, Deborah Dibbern. "Aplicação da microscopia otica de fluorescencia ao estudo de polimeros e blendas polimericas de PVA/PVAc." [s.n.], 1994. http://repositorio.unicamp.br/jspui/handle/REPOSIP/249475.

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Orientador: Teresa Dib Zambon Atvars<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Quimica<br>Made available in DSpace on 2018-07-20T11:35:20Z (GMT). No. of bitstreams: 1 Brunelli_DeborahDibbern_D.pdf: 7822049 bytes, checksum: 5c0e55c4eb8f38d9b5aa800764fc5426 (MD5) Previous issue date: 1994<br>Doutorado
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8

Bortolato, Claudia Amoroso. "Estudo espectroscopio de corantes xantenicos (uranina, eritrosina e rosa de bengala) em matrizes polimericas (PVA, PVAC e PEG 600)." [s.n.], 1991. http://repositorio.unicamp.br/jspui/handle/REPOSIP/249830.

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Orientador :Teresa Dib Zambon Atvars<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Quimica<br>Made available in DSpace on 2018-07-13T23:15:02Z (GMT). No. of bitstreams: 1 Bortolato_ClaudiaAmoroso_M.pdf: 4806402 bytes, checksum: eec0eed261fed12408c45f68abde5f65 (MD5) Previous issue date: 1991<br>Mestrado
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9

Králová, Marcela. "Studium fotochemického síťování methakrylovaného PVAl." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2008. http://www.nusl.cz/ntk/nusl-216427.

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This diploma thesis deals with a detailed study of photoinitiated radical polymerization of macromers base on PVAl containing lateral GMA moieties. The main goal is the evaluation of the influence of photoinitiator concentration, polymerisable group content and/or other aditives on the polymerisation rate. Other goals include the study of possible influencing the photochemical speed by lowering the glass transition temperature, compatibility with various photoinitiators etc. Attention is also paid to the study of prepared 3D polymeric networks properties
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10

Syk, Jakob. "Polyvinylalcohol-carbazate (PVAC) inhibits bacteria growth." Thesis, Uppsala universitet, Institutionen för kvinnors och barns hälsa, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-374385.

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Abstract Introduction This study evaluated the effect of the polymer polyvinylalcohol-carbazate (PVAC) on the bacteria Escherichia coli, Staphylococcus aureus, Staphylococcus epidermidis and Pseudomonas aeruginosa. PVAC is a polymer with a carbazate moiety that neutralizes free aldehydes and has shown great promise in stabilizing erythrocytes during long term storage. It has also been shown to reduce intraperitoneal adhesions after trauma. For this study, two Gram positive and two Gram negative bacteria strains were used with PVAC to evaluate its effect. Materials and methods PVAC was obtained
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Mach, Václav. "Tuhé pěny založené na acetalizovaném PVAl." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2008. http://www.nusl.cz/ntk/nusl-216426.

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This diploma thesis deals with the preparation of solid hydrophilic sponges made of acetalized PVAl. The sponges were produced by foaming by gaseous reaction by-product. The experimental work also includes the study of active compound immobilization into the sponge (finely ground lignite as a heavy metal sorbent).
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12

Hynštová, Karolína. "Příprava a charakterizace akrylových esterů PVAl." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2008. http://www.nusl.cz/ntk/nusl-216428.

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The diploma thesis deals with a detailed study of he esterification reaction between PVAl and acrylic and methacrylic acids. Tha goal is to prepared PVAl-based macromers bearing (meth)acrylic moieties bound to PVAl macromolecular backbone. Attention will be paid especially to equlibrium establishing times and to the influence of reaction mixture composition on the properties of resulting products.
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13

Bernhard, Kathleen C. "Methods to create and characteristics of porous poly(vinyl) alcohol for the purpose of facial implants." Thesis, Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/53112.

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Facial implants are becoming more common in America and across the world. In the United States last year, over 260,000 augmentation and reconstruction surgeries were performed on facial cartilage areas, while over two million soft tissue fillers were administered. The current implants on the market, though, are deficient in three major areas: they are too rigid, susceptible to migration, and require a large incision. Alternatively, dermal fillers lack shape and biodegrade too quickly. Poly(vinyl) alcohol (PVA) cryogel is a promising hydrogel alternative due to its softness, durable nature
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14

Wuyts, Shirley Lynne. "SAR processing using PVM." Master's thesis, University of Cape Town, 1998. http://hdl.handle.net/11427/21763.

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Bibliography: pages 120-121.<br>This thesis explores various methods of using PVM (Parallel Virtual Machine) to improve the speed of processing a SAR (Synthetic Aperture Radar) image. A network of heterogeneous machines were set up as the basis of the parallel virtual machine. SAR processing software was written for testing the PVM. The software performed simplified range and azimuth compression on simulated SAR images of a point target The theory and results were examined as part of the thesis. Complications such as range curvature, range migration and range dependent focusing were not addres
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15

Almeida, Tiago Luiz de. "Desenvolvimento de membrama composta de PVAI e quitosana compatível com o sistema dermo - epidérmico." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/85/85131/tde-29062009-162948/.

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Devido à grande incidência de pessoas com lesões de pele como queimaduras e úlceras e à baixa disponibilidade de doadores, houve a necessidade de desenvolvimento de biomateriais com a capacidade de mimetizar a pele. Para o desenvolvimento desses biomateriais, polímeros são utilizados na tentativa de alcançar características mais próximas as do órgão alvo. Neste sentido, nosso grupo vem desenvolvendo, há alguns anos, substitutos dermo-epidérmicos, particularmente membranas biodegradáveis e biocompatíveis constituídas de PVAl e quitosana. O PVAl, polímero sintético, foi utilizado para mimetizar
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16

Pedroso, Maitê Golinelli Vanella. "Estudo comparativo de colágeno hidrolisado e comercial com adição de PVA." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/75/75132/tde-11032010-111128/.

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O desenvolvimento de novos materiais tem sido baseado na mistura de dois ou mais polímeros ou biopolímeros, onde soluções destes são misturadas em diferentes proporções na tentativa de se obter materiais com propriedades distintas das de seus precursores. Neste trabalho foram analisadas blendas colágeno:PVA. O colágeno utilizado foi o tipo I, porem proveniente de duas formas diferentes, o colágeno comercial que foi cedido pela Novaprom Food Ingredients Ltda e o colágeno obtido a partir de tendão bovino por meio de hidrólise alcalina em diferentes tempos (24h e 96h). As blendas e os colágenos f
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17

Atlan, Michaël. "Implantation et évaluation de micro-implants vasculaires (< 2mm), à base d’alcool polyvinylique." Thesis, Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCD035/document.

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Sur la base de précédents travaux de l’unité INSERM 1148, sur des films à base d’alcool polyvinylique, nous avons implanté et évalué des prothèses de moins de 2mm de diamètre. L’ajout de gelatine in vitro a montré des capacités d’adhérence cellulaires, compatibles avec une endothelialisation in situ, des implants garant, d’une perméabilité à long terme. Notre modèle était le remplacement de 1cm d’aorte sous rénale de rat. Ces implants, ont été utilisées comme modèle d’entrainement basse fidélité à la microchirurgie, avec de meilleurs résultats sur l’acquisition de la technique d’anastomose mic
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18

Gross, Idejan Padilha. "Estudo de variáveis que modificam a cinética de cristalização do PLA em blendas PLA/PVAL e PLA-g-MA/PVAL." reponame:Repositório Institucional da UFSC, 2015. https://repositorio.ufsc.br/xmlui/handle/123456789/135281.

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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas, Programa de Pós-Graduação em Química, Florianópolis, 2015.<br>Made available in DSpace on 2015-09-29T04:09:08Z (GMT). No. of bitstreams: 1 334700.pdf: 1192728 bytes, checksum: fd838a7720b0408ea4a86d5d819eb827 (MD5) Previous issue date: 2015<br>A busca por materiais biodegradáveis tem sido intensificada nos últimos anos com o objetivo de reduzir impactos ambientais. O poli(vinil álcool) (PVAL) e o poli(ácido lático) (PLA) são polímeros biodegradáveis amplamente produzidos. Uma alternativ
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19

Kazakauskaitė, Ieva. "Teisė į PVM atskaitą kaip fundamentalus PVM principas: praktinės šios teisės realizavimo problemos Lietuvoje." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2010. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20101125_183238-74870.

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Pridėtinės vertės mokestis (toliau PVM) – mokestis imamas nuo papildomai sukurtos pridėtinės vertės, juo apmokestinant prekių tiekimą ir paslaugų teikimą. Pirmą kartą PVM įvestas Prancūzijoje 1957 m., tačiau galutinis šio mokesčio teisinis sureguliavimas siejamas su 1977 m. gegužės 17 d. priimta Šeštąja Tarybos direktyva. Lietuvoje nagrinėjamą mokestį reglamentuoja Lietuvos Respublikos pridėtinės vertės mokesčio įstatymas, kuris yra visiškai suderintas su Europos Sąjungos teisės aktais PVM srityje. PVM yra bendro pobūdžio, vartojimo, netiesioginis, daugiapakopis mokestis, renkamas atsižvelgian
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20

Dobiášová, Andrea. "Strukturní a transportní vlastnosti semi-IPN hydrogelů na bázi polyvinylalkoholu." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2021. http://www.nusl.cz/ntk/nusl-449409.

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The aim of master thesis was to study structural and transport properties of PVA films modified with method of semi-IPN with suitable polyectrolytes and plasticizers. The first important step was optimalization of PVA films preparation, when time of heating was set at 90 °C for 1 hour. Drying was set at 50 °C for 24 hours. Molecular weight of PVA was chosen 85–124 kDa in concentration 10 wt.%. For preparation of PVA-based semi-IPN thin films polyelectrolytes (polyglutamic acid, DEAE-dextran hydrochloride) and plasticizer (glycerol) were selected. Basic characterization of prepared materials wa
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21

Oliveira, Maria José Alves de. "Obtenção de membranas de hidrogéis para tratamento alternativo de Leishmaniose Tegumentar." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-08082013-170247/.

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Os hidrogéis foram obtidos a partir de material polimérico reticulado por processo de radiação ionizante de acordo com a técnica de Rosiak. Nos últimos 40 anos o uso dos hidrogéis têm sido investigado para diversas aplicações como curativos. Neste trabalho foram sintetizadas membranas de hidrogéis com poli(N-2- pirolidona) (PVP), poli(álcool vinílico) (PVAl), quitosana e argila laponita em encapsulamento do fármaco para liberação controlada de glucantime sobre a superfície cutânea de tecidos lesados por leishmaniose. O tratamento tradicional dos pacientes infectados pelos parasitas é feito com
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22

Laucius, Gediminas. "Teisės į PVM ataskaitą ir prievolės registruotis PVM mokėtoju santykis pridėtinės vertės mokesčio raidos kontekste." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2010. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20100224_104841-25561.

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Pridėtinės vertės mokestį yra įsivedusios apie 150 pasaulio valstybių, jis sudaro reikšmingą valstybių biudžeto pajamų dalį (statistiškai apie penktadalį). Pagrindinėmis priežastimis, nulėmusiomis beprecedentį PVM populiarumą ir sparčią mokesčio integraciją į daugumos pasaulio valstybių mokestines sistemas, laikomi reikšmingi alternatyvių netiesioginių apyvartos mokesčių sisteminiai trūkumai, kurių PVM neturi. Pridėtinės vertės mokesčio unikalumas ir pranašumas prieš kitus apyvartos mokesčius slypi pirkimo PVM atskaitos mechanizme, sudarančiame sąlygas apmokestinti tik kiekvienoje iš prekių ir
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Matoso, Erika 1973. "Determinação de contaminantes inorganicos em latex utilizando espectrometria atomica." [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/249409.

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Orientador: Solange Cadore<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Quimica<br>Made available in DSpace on 2018-08-13T13:12:41Z (GMT). No. of bitstreams: 1 Matoso_Erika_D.pdf: 946241 bytes, checksum: 56f70c56da8e0c3fb10d01d26c121fb7 (MD5) Previous issue date: 2009<br>Resumo: Os polímeros são um grupo importante de materiais de engenharia pela sua facilidade de produção e uma larga faixa de propriedades e aplicações. O acetato de polivinila (PVAc) é produzido pela polimerização do acetato de vinila em presença de um catalisador. Suas principais aplicações estão na
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Gomes, Anida. "Preparação, caracterização e avaliação da biodegradabilidade de blendas de amido/quitosana/PVA." reponame:Repositório Institucional da UFC, 2008. http://www.repositorio.ufc.br/handle/riufc/1110.

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GOMES, A.M.M. Preparação, caracterização e avaliação da biodegradabilidade de blendas de amido/quitosana/PVA. 2008. 175 f. Tese (Doutorado em Quimica Inorgânica) – Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2008.<br>Submitted by irlana araujo (irlanaaraujo@gmail.com) on 2011-11-09T16:46:46Z No. of bitstreams: 1 2008_tes_An Gomes.pdf: 8411527 bytes, checksum: d35563bda024138e52e8d733c8256fb2 (MD5)<br>Approved for entry into archive by Aline Nascimento(vieiraaline@yahoo.com.br) on 2011-11-11T11:08:33Z (GMT) No. of bitstreams: 1 2008_tes_An Gomes.pdf: 8411527 bytes, checksum: d
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Repka, Martin. "MDF kompozity AC-PVAl se zvýšenou odolností proti vlhkosti." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2010. http://www.nusl.cz/ntk/nusl-216599.

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Polymerem impregnované cementové materiály představují zajímavou a perspektivní alternativu klasických portlandských cementových past. Hlavním zástupcem těchto materiálů jsou macrodefect-free (MDF) kompozity, složené z anorganického pojiva a organického polymeru. I přes řadu vynikajících mechanických vlastností je plné zavedení MDF kompozitů na trh omezené především z důvodu jejich relativně nízké odolnosti vůči vlhkosti. Jednou z možností jak zvýšit odolnost výsledného MDF vůči vlhkosti je „in situ“ síťování polymeru. V této práci byla připravena počáteční série MDF kompozitů na bázi hlinitan
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Depp, Michelle McRae. "PVA cryogel optimization and diffusion studies." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/11194.

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Vicentin, Elaine Cristina Matos. "Imunizações pré-clínicas contra malária baseadas no Antígeno 1 de Membrana Apical (PvAMA-1): testes de protocolos homólogos e heterólogos de indução e reforço utilizando DNA plasmidial e/ou proteína recombinante." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/9/9136/tde-21052013-170007/.

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O Antígeno 1 de Membrana Apical (AMA-1) é um dos mais promissores candidatos a vacina contra a fase sanguínea da malária. No presente estudo, geramos uma nova proteína recombinante baseada no ectodomínio de AMA-1 de P. vivax (PvAMA-1) a partir do gene sintético com códon otimizado para expressão secretada na levedura Pichia pastoris. Por ELISA, a proteína PvAMA-1 foi reconhecida por 62,5% dos soros de pacientes da Amazônia brasileira infectados por P. vivax. A imunogenicidade de PvAMA-1 foi avaliada em camundongos BALB/c, utilizando protocolos homólogos e heterólogos de indução e reforço com D
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Hesketh, Andrew J. "An investigation into the biodegradation of synthetic polymer dispersions employing a model system based on polyvinyl acetate." Thesis, Staffordshire University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312228.

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Cabral, Deliane da Silva. "Estudo da miscibilidade de blendas de poli(hidroxibutirato)/poli(álcool vinílico) obtidas por mistura mecânica." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/18/18158/tde-02052017-095306/.

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Poli(hidroxibutirato) (PHB) é um polímero com um alto potencial de aplicação industrial, pois é biodegradável, tem propriedades físicas semelhantes ao poli(propileno) e é o mais abundante de sua classe, os poli(hidroxialconoatos). Porém, sua rigidez e fragilidade, combinadas com seu elevado custo de produção, têm limitado sua utilização em larga escala. Nesse sentido o PHB pode ser utilizado para o desenvolvimento de novos materiais como blendas, que são mais viáveis em comparação aos métodos de síntese. Estudos de blendas PHB/PVA por solução reportam boa compatibilidade entre os componentes,
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Benčik, Ondřej. "Iontoměničové membrány na bázi polyvinylalkoholu pro palivové články s polymerním elektrolytem." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220287.

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Fuelcells are perspective alternative source of power. Currently used polymer electrolyte membrane. They have good qualities, but they are expensive. This is the reason, why we looking for alternative.This work deal with research qualities polymer electrolyte membrane based on Polyvinylalcohol. This polymer elecrolyte membrane asassembly to MEA structure and research qualities. This qualities based on electrical and non electrical value.
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Bučelytė, Odeta. "Mokestinių ginčų dėl PVM teisinė analizė Lietuvoje." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2013. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2013~D_20130626_182624-02849.

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Magistro baigiamajame darbe atlikta teisinė analizė mokestinių ginčų dėl PVM atžvilgiu bei iškeltos problemos ir pateiktos išvados dėl PVM reglamentavimo Lietuvoje ir jo atitikimo šiandienos aktualijoms, kadangi būtent dėl PVM kyla daugiausia mokestinių ginčų. Teisinė analizė atlikta pasinaudojus egzistuojančia mokestinio ginčo nagrinėjimo struktūra, t.y. ikiteismine bei teismine stadijomis. Minėta analizė atlikta mokestinius ginčus dėl PVM suskirsčius į tris rūšis: ginčus dėl PVM atskaitos; ginčus dėl PVM atskaitos tikslinimo; ginčus dėl lengvatinio 0 PVM tarifo taikymo. Pirmojoje darbo dalyj
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32

Kunovjánek, Miroslav. "Studium vodivosti PVA membrán, obsahujících alkalické hydroxidy." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-234580.

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Thesis deals with study of separators and membranes, suitable for using in alkali electrochemical applications like fuel cells or electrolysis. As basic material for membranes production is used polyvinylalkohol (PVA). Various methods of PVA cross linking are introduced in the thesis. PVA membranes are also doped by various types of additives to improve the attributes of the membranes like mechanical stability and or conductivity. The aim of the work is verification of parameters of membranes, doped by alkali hydroxides KOH, NaOH and LiOH at various temperatures. These hydroxides are added to
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33

Bian, Yan. "Durabilité des géosynthétiques en Poly(alcool vinylique)." Thesis, Paris, ENSAM, 2019. http://www.theses.fr/2019ENAM0024/document.

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Ce travail de thèse repose principalement sur l’étude de l’impact des facteurs environnementaux (température, humidité, pH) sur le vieillissement des fils de HT-PVAl destinés à la conception des bandes géosynthétiques. Les objectifs étaient d’identifier les produits, les mécanismes et les cinétiques de dégradation, et de déterminer l’impact du vieillissement sur la structure chimique, les propriétés physiques et mécaniques des fils. Il s’agissait aussi de proposer une méthodologie générale d’étude de la durabilité des produits géosynthétiques à base de fils de HT-PVAl. Ces derniers sont sujets
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Cecchi, Fyfe Antonio Alessandro. "Estudio econométrico de precios de metales no ferrosos aplicación de Pvar." Tesis, Universidad de Chile, 2012. http://www.repositorio.uchile.cl/handle/2250/104426.

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Ingeniero Civil de Minas<br>El análisis y modelación de precios de metales es esencial para tomar y ejecutar decisiones de inversión en todos los campos de la actividad minera: exploración, evaluación de recursos, planificación minera, proyectos de expansión, entre otros. Los modelos predictivos de precios han adquirido relevancia con la irrupción de la computación y los métodos matemáticos. Ellos han evolucionado al punto que ha sido posible pronosticar escenarios futuros del precio de los commodities metálicos. Sin embargo, la predicción siempre tiene asociada incertidumbre. Por otra parte,
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Costa, Rodolfo Ferreira Ribeiro da. "O impacto das transferÃncias constitucionais sobre o comportamento fiscal dos municÃpios brasileiros." Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=11793.

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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior<br>Em paÃses onde o sistema de governo possui um carÃter descentralizado observa-se uma forte dependÃncia de recursos provenientes das entidades superiores da federaÃÃo, por parte das esferas inferiores da administraÃÃo pÃblica. No Brasil, tal fato à confirmado pelo fato das transferÃncias intergovernamentais representarem, em mÃdia, um volume superior a 88% das receitas totais. Apesar da sua importÃncia na composiÃÃo das receitas das gestÃes municipais, o financiamento da atividade pÃblica via sistema de repasses intergovernamentais
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Konuru, Ravindranath Bala. "A migratable user-level process package for PVM /." Full text open access at:, 1995. http://content.ohsu.edu/u?/etd,633.

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Castro, Terezinha Aparecida Martins Gomes de. "Caracterização de isolados brasileiros de Pneumovirus Aviario (PVA)." [s.n.], 1999. http://repositorio.unicamp.br/jspui/handle/REPOSIP/314052.

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Orientador: Clarice Weis Arns<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Biologia<br>Made available in DSpace on 2018-07-25T00:16:25Z (GMT). No. of bitstreams: 1 Castro_TerezinhaAparecidaMartinsGomesde_D.pdf: 3942349 bytes, checksum: 197c32f0bac44952abb9c2999cf2dd2b (MD5) Previous issue date: 1999<br>Resumo: O pneumovirus aviário (PVA) causa infecção aguda no trato respiratório em perus (rinotraqueite de perus) e galinhas (síndrome da cabeça inchada) com início abrupto e disseminação. No presente trabalho foram estudados dois isolados de PVA: SHS BR-119 e SHS BR-12
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Farias, Denilson Atilio Godry. "Paralelização da Técnica Branch and Bound com PVM." reponame:Repositório Institucional da UFPR, 2011. http://hdl.handle.net/1884/25089.

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Resumo: Este trabalho aborda a implementação paralela da técnica Branch-and-Bound em problemas de otimização combinatoria, especificamente busca em grafos. E utilizado na implementação o modelo de programação paralela por troca de mensagens com o uso da biblioteca Parallel Virtual Machine (PVM) sobre o sistema operacional Linux em uma arquitetura multicomputador. E analisado o comportamento da técnica Branch-and-Bound, em particular a relação entre (a) três critérios de busca, (b) a utilização dos recursos de memória e (c) granularidade de, processamento e comunicação entre processos. E propos
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Qi, Meirigeng. "PVA hydrogel sheet macroencapsulation for the bioartificial pancreas." Kyoto University, 2005. http://hdl.handle.net/2433/144710.

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Gomes, Anida Maria Moraes. "PreparaÃÃo, caracterizaÃÃo e avaliaÃÃo da biodegradabilidade de blendas de amido/quitosana/PVA." Universidade Federal do CearÃ, 2008. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=1766.

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FundaÃÃo Cearense de Apoio ao Desenvolvimento Cientifico e TecnolÃgico<br>Os objetivos deste trabalho foram desenvolver, caracterizar fÃsico-quÃmica e reologicamente blendas de amido de inhame (Dioscorea esculenta L.), jalapa (Operculina tuberosa Meisn.), carà chinesa (Colocassia esculenta L.) e feijÃo verde (Vigna unguiculata (L.) Walp.) com quitosana e PVA e avaliar sua biodegradaÃÃo no solo. As propriedades mecÃnicas dos amidos variaram entre si, indicando uma organizaÃÃo molecular diferente entre eles. Os filmes de amido de feijÃo foram os mais extensÃveis e resistentes, enquanto os de car
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Eugênio, Rafael Augusto Pinholati [UNESP]. "Painéis de medium density fiberboard produzidos com adesivo alternativo." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/145030.

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Submitted by RAFAEL AUGUSTO PINHOLATI EUGENIO null (rafael.pinholati@duratex.com.br) on 2016-12-06T23:33:20Z No. of bitstreams: 1 DISSERTAÇÃO RAFAEL - MESTRADO Rev 4.pdf: 3957807 bytes, checksum: 74c157bc6d300c719cca57459b4455da (MD5)<br>Approved for entry into archive by Felipe Augusto Arakaki (arakaki@reitoria.unesp.br) on 2016-12-09T12:54:47Z (GMT) No. of bitstreams: 1 eugenio_rap_me_bauru.pdf: 3957807 bytes, checksum: 74c157bc6d300c719cca57459b4455da (MD5)<br>Made available in DSpace on 2016-12-09T12:54:47Z (GMT). No. of bitstreams: 1 eugenio_rap_me_bauru.pdf: 3957807 bytes, checksum:
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Ouros, Aline Cristiane dos. "Estudo das propriedades micro e macroscópicas de nanocompósitos de PVAL/nanopartículas eletrocondutoras." reponame:Repositório Institucional da UFSC, 2012. http://repositorio.ufsc.br/xmlui/handle/123456789/95369.

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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas, Programa de Pós-graduação em Química, Florianópolis, 2011<br>Made available in DSpace on 2012-10-26T00:44:27Z (GMT). No. of bitstreams: 1 287334.pdf: 4292167 bytes, checksum: d14d882a948fc7523ba5bc277d5b09b3 (MD5)<br>A obtenção e estudo das propriedades de nanocompósitos poliméricos têm atraído grande interesse de recentes pesquisas. Os nanotubos de carbono e negro de carbono têm mostrado ser um reforço efetivo para modificar as propriedades elétricas, mecânicas e físicas dos materiais.
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MATOS, Felipe Martins. "Impacto dos choques do petróleo nas economias Latino-Americanas." Universidade Federal de Pernambuco, 2015. https://repositorio.ufpe.br/handle/123456789/14911.

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Submitted by Haroudo Xavier Filho (haroudo.xavierfo@ufpe.br) on 2016-01-12T19:19:24Z No. of bitstreams: 1 Dissertação FELIPE MARTINS MATOS VF.pdf: 1523819 bytes, checksum: 1f6c0c20a2cacf060e2a781c4bba0c81 (MD5)<br>Made available in DSpace on 2016-01-12T19:19:24Z (GMT). No. of bitstreams: 1 Dissertação FELIPE MARTINS MATOS VF.pdf: 1523819 bytes, checksum: 1f6c0c20a2cacf060e2a781c4bba0c81 (MD5) Previous issue date: 2015-08-28<br>CAPES<br>Este trabalho busca avaliar o impacto dos choques do petróleo sobre a economia de países latino-americanos selecionados com base em dados trimestrais entre
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Melrose, Heather. "The effect of ageing on perivascular adipose tissue function." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/the-effect-of-ageing-on-perivascular-adipose-tissue-function(2138e081-8d66-4db0-b8ba-968029cab369).html.

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Increasing age is the single biggest independent risk factor for cardiovascular disease, which is in turn the leading cause of morbidity and mortality worldwide. Ageing is associated with hypertension and metabolic changes which all increase the risk of the development of cardiovascular disease. In young, healthy individuals, perivascular adipose tissue (PVAT) secretes factors that can influence vascular contractility, exerting a net anti-contractile effect against numerous vasoconstrictors including the thromboxane A2 mimetic U46619 and α1-adrenoceptor phenylephrine. Whilst it is known that d
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45

mehmood, Saad. "Design and Development of an impeller for 100% PVM : Design and Development of an impeller for 100% PVM for Radinn Hydro Jet." Thesis, Tekniska Högskolan, Jönköping University, JTH, Konstruktion och produktutveckling, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-50568.

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This project aims to design and develop hydro jet which is integrated to Electric motor, whichis limited to run at 70% PWM. Which limits the efficiency of the system, to make an efficientsystem, hydro jet parameters are not defined which are desired to be defined by design fourimpellors for basic Radinn G2x Jet Pack design. The impellors will be four expected points inHydro Jet and final impellor is assumed to lie between these design points, to find the finalspecifications of the hydro jet, the hydro jet will be designed, using computational fluiddynamics they will be analysed. After analysis
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46

Glowania, Micheal, Oliver Weichold, Markus Hojczyk, Gunnar Seide, and Thomas Gries. "Neue Beschichtungsverfahren für PVA-Zement-Composite in textilbewehrtem Beton." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1244043027880-94266.

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Im Rahmen des Transferprojektes T01 „Textilbeschichtung mit hochviskosen Massen“ des Sonderforschungsbereiches 532 (SFB 532) wird die Realisierung und Bewertung eines integrierten Beschichtungskonzeptes zur nachhaltigen Verbesserung der Tragfähigkeit von textilbewehrten Betonbauteilen an der RWTH Aachen University untersucht. Dazu wird eine neue Auftragstechnik für hochviskose Beschichtungsmassen entwickelt, die eine vollständige Penetration von Multifilamentgarnen mit großen Garntitern und einer hohen Anzahl an Filamenten in textilen Gelegen erzielt. Des Weiteren werden aktive Beschichtungsma
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47

Busu, Alice. "Development of PVA/PDA nanocomposite membranes for CO2 capture." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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In this project, composite membranes containing nanoparticles of polydopamine PDA (dopamine polymer) will be manufactured and characterized in view of their use for the separation of CO2. Polysulfone will be used as a polymer matrix support while poly(vinyilalcohol) has been chosen as selective layer material. The work will first focus on the optimization of the manufacturing parameters of nano composite membranes and then on the influence of the integration of PDA nanoparticles in the polymeric support at different concentrations. The final objective is to test the material properties, with
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48

Hanashi, Salah. "System-level fault diagnosis in the distributed PVM environment." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/MQ31581.pdf.

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49

Dai, Xiaoshu. "Calcium phosphate scaffolds from electrospun PVA/inorganic sol precursors." Worcester, Mass. : Worcester Polytechnic Institute, 2006. http://www.wpi.edu/Pubs/ETD/Available/etd-042506-161758/.

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50

Regan, David G., Konstantin I. Momot, Penny J. Martens, Philip W. Kuchel, and Laura Poole-Warren. "NMR measurement of small-molecule diffusion in PVA hydrogels." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-194358.

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Hydrogels are biocompatible polymeric materials that are becoming increasingly important in biomedical applications, such as drug delivery and tissue engineering. Understanding of small-molecule diffusion in these systems is important in the contexts of controlled drug release; transport of nutrients (e.g., O2 and growth factors) into the gel; and transport of cellular waste out of the gel. In this work, the diffusion coefficient of the aromatic amino acid phenylalanine (Phe) in non-crosslinked and crosslinked poly(vinyl alcohol) (PVA) hydrogels was measured using two NMR diffusion methods, CO
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