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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 129 for “"PVP"”.
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Characterization and interphase mechanical properties of epoxy/PVP blends
… sizing material (poly n-vinylpyrrolidone or PVP) around graphite fibers enhances the mechanical properties of carbon fiber reinforced epoxy composites. Understanding the influence of the interphase region between the carbon fiber and epoxy matrix is crucial in enhancing the performance of …
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Wirksamkeit und Verträglichkeit von liposomalem PVP-Iod-Hydrogel bei der lokalen Behandlung des Ulcus cruris
PVP-Iod spielt eine Schlüsselrolle in der lokalen Wundbehandlung. In dieser Studie wurde erstmals ein neuartiges liposomales PVP-Iod-Hydrogel in der lokalen Behandlung des Ulcus cruris eingesetzt. Eine randomisierte, kontrollierte Phase II Pilotstudie diente zur Erprobung der Wirksamkeit und …
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The development of PVP-based solid dispersions using hot melt extrusion for the preparation of immediate release formulations
… hand, the hydrophilic polyvinylpyrrolidone (PVP) polymer with its good stabilising ability in the solid dispersion is less applied in HME process due to its possible degradation at high temperature. However, rejection on the use of PVP without thorough understanding of its potential might …
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The effects of PVP(FE(III)) catalyst and polymer molecular weight on gene delivery via biodegradable crosslinked polyethylenimine
… In the present work, we utilized a heterogenous PVP(Fe(III)) catalyst to provide a more controllable PEI crosslinking reaction and wider range of biodegradable PEIs. The biodegradable PEIs reported here have molecular weights ranging from 1.2 kDa to 48 kDa, are nontoxic in MDA-MB-231 cells, and …
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Film Formation via Drying of Polymer Solutions
… solution, specifically polyvinylpyrrolidone (PVP) and ethanol, a formulation often utilised in skin and personal care products. An imaging rig was designed and optimised to study the drying and spreading dynamics, as well as dried morphology of PVP droplets at ambient conditions. Drying …
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Optimalizace izolace DNA z šípků
… přidáním CTAB pufru s 3% polyvinylpyrrolidonem (PVP) neměl žádaný výsledek kvůli vysokému znečištění polyfenolickými látkami nebo proteiny, ale bylo zjištěno, že tato metoda je vhodná pro izolaci DNA z listu růže šípkové. K odstranění kontaminantů byl navržen postup s přidáním vyšší koncentrace …
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Tailoring electrospun nanofibers and electrosprayed nanoparticles to enhance cellular uptake of low bioavailability drugs
… Biodegradable polymer polyvinylpyrrolidone (PVP), and polycaprolactone (PCL) were used in the projects to produce nanomaterials using simple and straight forward techniques of electrospinning and electrospraying. In the first project, preparation, and characterization of PCL and PVP …
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Genetic diversity and pathogenicity of pea downy mildew (Peronospora viciae f. sp. pisi) in New Zealand : A thesis submitted in partial fulfilment of the requirements for the Degree of Master of Applied Science at Lincoln University
… pathogen Peronospora viciae f. sp pisi (Pvp) which occurs sporadically throughout temperate pea growing regions across the world. Severe infections can completely disrupt commercial production by reducing crop quality and yield; early season systemic infections can ultimately prevent seed …
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Order in Thin Films of Diblock Copolymers by Supramolecular Assembly
… of polystyrene-block-poly(4-vinylpyridine) (PS-PVP) were associated with the molecules of two different low molar mass additives, 2-(4'-hydroxybenzeneazo)benzoic acid (HABA) and 3-n-pentadecyl phenol (PDP), via hydrogen bonds. The choice of an additive and a solvent is a key factor which …
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Analytical and experimental investigation of photovoltaic pumping systems
Photovoltaische Pumpensysteme (PVP-Systeme) für die Trinkwasserversorgung und Bewässerung in ländlichen Regionen von Entwicklungsländern sind in letzter Zeit zunehmend in ihrer Aktzeptanz, Verläßlichkeit und Leistungsfähigkeit gestiegen. Sie sind heutzutage einer der bedeutendsten …
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Direct Precipitation of Micron-Size Salbutamol Sulphate by Antisolvent Crystallization
… methyl cellulose (HPMC), polyvinylpyrrolidone (PVP K25), lecithin (from soybean) and Span 85 were investigated as the additives applied in antisolvent crystallization. Among them PVP K25 showed the strongest effect on crystal growth inhibition. By adding PVP K25 into the SS solution, the habit …
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The Use of Nanonindentation to Determine Composite Interfacial Shear Strength and the Effects of Environmental Aging
… of three sizings, poly(vinylpyrrolidone) (PVP), a carboxyl modified polyhydroxyether (PHE), and a standard industrial sizing (G'), have revealed tremendous improvements in static mechanical and enviro-mechanical properties. The focus of this work is to determine if these improvements in …
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Engineering of Amorphous Active Pharmaceutical Ingredients by Sonoprecipitation and Spray Drying Pre-and Post-Processing Pharmaceutical Characterisation. Pre- and Post-Processing Physicochemical and Micromeritic Characterisation of Active Pharmaceutical Ingredients
… selection of polyvinylpyrrolidone vinyl acetate (PVP-VA) co-polymers has been applied to investigate impact of sonoprecipitation processing parameters and a composition of PVP-VA on physicochemical and micromeritic properties of BUD/PVP-VA nanoparticulate composites. Studies confirmed that in …
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Physicochemical characterization of solid dispersions prepared using hot-melt extrusion technology
… oxide (PEO) or polyvinylpyrrolidone (PVP) as hydrophilic carriers, whereas PVP or Eudragit 4155F was used to prepare the hot- melt extruded solid dispersions of CX. The solid state properties of the prepared solid dispersions were characterized using differential scanning calorimetry …
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Insight into Nucleation Kinetics of Flufenamic Acid Cocrystal Formulation in Solution: Investigating the Role of Polymeric Excipients through Combined Experimental and Computational Approaches
… of selected polymers, polyvinyl pyrrolidone (PVP), polyvinylpyrrolidone-vinyl acetate copolymer (PVP-VA), polyethylene glycol (PEG), and soluplus (SOL), on the nucleation and growth of cocrystals of FFA with theophylline (FFA-TP) and nicotinamide (FFA-NIC) was evaluated. Cocrystals, as …
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Fabricating Complex-Shaped Components by Room-Temperature Injection Molding of Aqueous Ceramic Suspension Gels
… vol.%) of water-soluble polyvinylpyrrolidone (PVP). Rheological study of alumina CeraSGels using parallel plate rheometry revealed that suspensions containing PVP as a viscosity modifier behaved like yield-pseudoplastic fluids at room temperature. Because understanding flow properties of …
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Interphase properties and their effects on the compression mechanics of polymeric composites
… amorphous thermoplastic polyvinylpyrrolidone (PVP) size showed a graded morphology very different from that formed in the presence of the unreacted epoxy size in a thermoplastic toughened epoxy matrix. However, these morphological differences were not introduced in an untoughened epoxy matrix, …
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Microbial Activity during Biodegradation and its Effects on Groundwater Velocity in a Contaminated Aquifer
… were measured with point velocity probes (PVPs) arranged into multilevel standpipes and installed into the flow gate. PVP results were compared with electromagnetic wave velocity measurements from a ground penetrating radar (GPR) survey conducted in the same flow gate. Following the …
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Development of Medical Device for Volume Status Assessment Using Peripheral Venous Pressure
… has improved, small peripheral venous pressure (PVP) signals collected using a transducer on an intravenous catheter can be analyzed to monitor patient volume status. This thesis details the development of an embedded system prototype that quickly and accurately assesses volume status using PVP …
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Desenvolvimento e avaliação da atividade esquistossomicida de dispersões sólidas à base de LQIT/LT-50 e LQIT/LT-51
… polietilenoglicol (PEG) e polivinilpirrolidona (PVP K-30) como carreadores hidrofilicos, obtidas pela técnica do solvente. As dispersões que obtiveram melhor resultado passaram por testes de solubilidade, espectroscopia de absorção na região do infravermelho com transformada de Fourier (FTIR), …
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