Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 145 for “"PUR"”.
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Urychlení manipulační pevnosti u 2K PUR lepidla
Práce se věnuje urychlení doby k získání manipulační pevnosti u dvoukomponentního polyuretanového adheziva, které bylo nově zakoupeno ve firmě Magna Exteriors Bohemia a bylo potřeba otestovat. K urychlení po rozboru problému byly vybrány metody IR zářiče, teplotní komory, které se porovnávaly s …
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Modélisation et commande non linéaire pur la poursuite de trajectoire du robot UMIS
À l'heure actuelle, la quasi-totalité des manipulateurs utilise un mode de contrôle des joints indépendant de type proportionnel, intégrale et dérivée classique. Ce mode de contrôle est appliqué pour des raisons de coûts de développement et de maintenance. Beaucoup de travaux ont été réalisés sur …
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Moisture-Cure Polyurethane Wood Adhesives: Wood/Adhesive Interactions and Weather Durability
… two main subjects of moisture-cure polyurethane (PUR) wood adhesives: wood/PUR interactions and structure-property behavior emphasizing on weather durability. For these purposes, one simplified model PUR (MPUR) and three more commercially significant PURs (CPURs) with different hard segment …
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Variable Frequency Microwave Curing of Polyurethane
… Of these coating compositions, polyurethanes (PURs) were one of the most prevalent. Polyurethanes became possible in 1937 when Otto Bayer developed the diisocyanate polyaddition process [Randall et al, 2002]. Since that time, literally thousands of PUR compositions have been used commercially. …
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Mode-I Fracture in Bonded Wood: Studies of Adhesive Thermal Stability, and of the Effects of Wood Surface Deactivation
… compare the thermal stability of polyurethane (PUR) and resorcinol-formaldehyde (RF) wood adhesives. Bonded specimens for both adhesives were subjected to prolonged thermal exposure, and fracture testing was subsequently conducted after re-equilibration to standard test conditions. It was found …
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Untersuchung der Kalzifikation von Perikard und Polyurethan in Abhängigkeit des pH-Wertes
… of prosthetic material like polyurethanes (PUR) for cardiovascular implant, process of surface induced calcification needs to be analysed. In the the presented work current literature on pathological calcification of heart valve bioprosthesis and homografts is reviewed. The experimental part …
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L' effet de l'entreposage du (-)-trans-[delta]-THC et son influence sur l'extinction d'un comportement d'évitement chez les rats
… d'évitement chez les rats. La drogue, pure à l'arrivée, a été dissous dans une solution de propylène-glycol et d'éthanol. Ensuite, une partie du mélange fut réfrigérée et conservée à l'épreuve des rayons de lumière (THC pur); l'autre partie fut exposée à la lumière et la chaleur pour …
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Co-existence and niche separation of two subspecies of Photorhabdus temperata associated with Heterorhabditis downesi in a dune grassland
… associated with two different colour variants (pur and yel) of its Photorhabdus bacterial symbiont in sand dunes on North Bull Island in Dublin Bay, with evidence of the pur variant being more common to the front of the dunes. The main objectives of this study were to confirm the distribution of …
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Appropriate water treatment for the Nyanza Province of Kenya
… study focuses on the technical component. Its purpose is to evaluate the most appropriate water treatment in SWAK communities in the Nyanza Province. Three water treatment products were assessed - WaterGuard®, PuR®, and an alternative naturally occurring coagulant made of seeds from the Moringa …
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Fundamental Analysis of Wood Adhesion Primers
… with a moisture-cure polyurethane adhesive (PUR). The objective was to document wood rheological changes induced by the three primers, and determine if these changes correlated to primer efficacy in PUR-bonded red oak. Adhesion was tested in mode-I (opening) fracture using dual cantilever …
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Performance of aerogel composite and foam insulations
… foams (XPS) and one blown polyurethane foam (PUR) on plywood ) were evaluated. Thermal conductivity (reciprocal of resistivity) was measured with a heat flow metering apparatus at one week in- tervals for five weeks. Insulations were exposed to conditions of 65.6◦C and 90% RH, 65.6◦C and 60% …
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Lodovico Antonio Muratori giurista e politico
… e politico di Lodovico Antonio Muratori. Pur concentrando principalmente l’indagine sugli scritti giuridici e politici muratoriani si è tentato di restituire la viva personalità di Muratori prendendo in considerazione i diversi ambiti della sua vastissima produzione letteraria. Il …
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Étude du comportement des fluides magnétorhéologiques (MR) en compression-cisaillement simultanée
… le fluide MR strictement en cisaillement pur. Dans de telles conditions, la densité de couple des embrayages est limitée par l'optimisation de la mécanique des embrayages (ex. : poids) [63] et les propriétés fondamentales des fluides MR (ex. : contrainte) [11]. Alors qu'en cisaillement …
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Tra spazio e paesaggio. Studi su Calvino, Biamonti, Del Giudice e Celati
… di "scuola" calviniana, che hanno esordito, pur con aspetti di indubbia originalità, sotto l'egida di Calvino, risentendo in modo diverso del modello di riferimento rappresentato dallo scrittore ligure.
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Paramètres d'émission thermoélectronique d'un monocristal de rhenium en géométrie spherique
… déterminer les paramètres d'émission du rhénium pur dans différentes directions cristallographiques; 2) vérifier la validité de la méthode d'analyse des données. A ces deux objectifs principaux viendra s'ajouter un problème pertinent à l'étude des surfaces émissives, soit l'effet du traitement …
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The xenogenous capacitation response of fresh, cooled/extended and frozen/thawed equine semen as determined by a chlortetracycline stain
… characteristic of capacitated (PCAP), unreacted (PUR) and acrosome reacted (PAR) sperm. Mean PCAP was not significantly different in estrous ewes despite an increasing trend. Mean PUR and PAR were also not different. Differences in capacitated, acrosome reacted and unreacted spermatozoa in …
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Package-scale galvanically isolated systems for data transfer [Sistemi di isolamento galvanico package-scale per trasferimento dati]
… mostrando un basso consumo di potenza pur mantenendo prestazioni allo stato dell’arte.
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L'attuazione delle decisioni che applicano una penalità " nell'ambito dello spazio giudiziario europeo tra pubblico e privato "
… indicazioni di principio. Tali indicazioni, pur essendo in sé apprezzabili, hanno tuttavia trascurato totalmente di coordinare detta disciplina con altre norme poste dal Regolamento e di considerare l’aspetto, altrettanto cruciale, dell’innesto dello strumento nel tessuto normativo interno …
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«Il Politecnico»: progetto e storia di una narrazione visiva
… per la lettura di un attivismo vittoriniano che, pur nella apparente distanza dalla produzione narrativa dell autore, mostra non pochi punti di contatto con i tratti distintivi della sua poetica e con le sue più moderne e feconde intuizioni.
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Open Government Data. Dall empowerment del cittadino all innovazione nella pubblica amministrazione: il caso italiano in un ottica comparata
… elaborazione dei dati dell Open Data Barometer. Pur all interno di processi di convergenza globale, i risultati mostrano una forte diversificazione delle strategie e delle politiche messe in campo nei diversi paesi analizzati, in base alla peculiarità dei fattori socio-istituzionali richiamati …
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