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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 147 for “"PAA"”.
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Freeze Casting of Aqueous PAA-Stabilized Carbon Nanotube-Al2O3 Suspensions
… casting were found with Poly(acrylic acid) (PAA) dispersant, at 2.00 wt% (of Al2O3), pH of 9.5, and a solids loading of 40 vol%. Carbon nanotubes (CNTs) were added to that suspension in increments of 0.14, 0.28, 0.53, 1.30 and 2.60 vol%. The viscosity increased dramatically upon addition of …
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Análise do programa de aquisição de alimentos (paa) na comunidade negra de Camará
Family farming is considered an extremely important sector for a country’s domestic supply, and also for the income of thousands of Brazilians. However, that kind of farming has faced many difficulties in relation to market accessibility, as the less fortunate farmers have had problems to sell …
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PAA/PEO Comb Polymer Effects on the Rheological Property Evolution in Concentrated Cement Suspensions
… and presence of pure polyelectrolytes and PAA/PEO comb polymers with a wide range of PAA backbone molecular weight, PEO teeth molecular weight, and acid:imide ratio. Cement-PAA suspensions experienced rapid irreversible stiffening and set at 6 min due to ion-bridging interactions between …
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Synthesis and study of the micellization behavior of a dual temperature- and pH-responsive PAA-b-PNIPAM block copolymer
… poly(acrylic acid-block-N-isopropylacrylamide) (PAA-b-PNIPAM) diblock copolymers with different relative chain lengths of the hydrophobic and hydrophilic blocks were synthesized by reversible addition fragmentation chain transfer polymerization. The preliminary results showed high conversion …
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How Ch-paa-qn Got It's Name: A Sixth-Grade Geography Curriculum Unit for Indian Education for All in Montana
Nellis, Mary, M.A., Summer 2013 Geography How Ch-Paa-Qn Got Its Name: A Sixth-Grade Geography Curriculum Unit for Indian Education for All in Montana Chair: Sarah J. Halvorson This thesis reports on the design and implementation of a sixth-grade geography curriculum based on Montana House Bill 412 …
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How Ch-paa-qn Got It's Name: A Sixth-Grade Geography Curriculum Unit for Indian Education for All in Montana
Nellis, Mary, M.A., Summer 2013 Geography How Ch-Paa-Qn Got Its Name: A Sixth-Grade Geography Curriculum Unit for Indian Education for All in Montana Chair: Sarah J. Halvorson This thesis reports on the design and implementation of a sixth-grade geography curriculum based on Montana House Bill 412 …
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Fate and Effect of Peracetic Acid Solutions on Biological Wastewater Treatment Systems
Peracetic acid (PAA), as a wide-spectrum effective disinfectant, has been extensively and increasingly used in many industries, especially in poultry processing to control food-borne pathogens. Upsets of biological wastewater treatment processes and failures of whole effluent toxicity (WET) tests …
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Quantitative analysis and modeling of microembolic phenomena
… Polyacrylic acid microspheres (PAA-MS) for use as catheter-deliverable therapeutic emboli. These emboli expand in aqueous media such as blood and remain unexpanded in custom delivery media. The techniques developed to investigate therapeutic microemboli were applied to the …
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Evaluation of cellular interactions with functionalized scaffolds for cardiovascular tissue engineering
… an interim grafting step. Poly (acrylic acid) (PAA) is a non-toxic, FDA approved hydrogel that has been shown in preliminary studies (previous research and own experience) to improve cell adhesion even without the addition of specific cell-binding compounds. This project aims to show the effect …
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Inorganic Nanoparticle Nucleation on Polymer Matrices
… silver nanoparticles using poly (acrylic acid) (PAA) as the templating agent. Ionic silver was chemically reduced by sodium borohydride (NaBH4) in the presence of PAA. The effect of varying reactant concentrations of silver, NaBH 4, and PAA on particle size was studied. Reaction conditions in …
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Influence of additives on stabilization and mineralization pathway of amorphous calcium carbonate nanoparticles
… in solution within a poly (acrylic acid) (PAA) matrix. AFM imaging revealed that the PAA-ACC nanoparticles are composed of ACC nanograins with embedded PAA. The influence of organic additives (glucose, aspartic acid, glutamic acid) and Ca2+ on the mineralization and stabilization of PAA-ACC …
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Novel polyelectrolyte complexes for oral insulin delivery.
… amines using methyl iodide, to yield quaternised Paa (QPaa). The average level of polymer quaternisation was determined by elemental analysis and was found to be 72 plus-minus 2 mol%. Subsequent thiolation of Paa and QPaa involved carbodiimide mediated conjugation to N-acetylcysteine (NAC) and …
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Fundamentals and application of the collapse transition of poly(acrylic acid) for synthesis of various polymer-templated nanoparticles
… governing the collapse of poly(acrylic acid) (PAA) by various ions and identified optimal synthesis condition for the polymer-counterion nanoparticles was investigated. First, a counterion concentration range at which PAA was collapsed yet have not formed aggregates was determined via viscosity …
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Fundamental studies of pH-sensitivity in polyelectrolyte multilayers
… polyelectrolytes, such as poly(acrylic acid)(PAA) and poly(allylamine hydrochloride) (PAH) from two perspectives of the assembled multilayers - functional group composition and layer growth. In the first part of this thesis, with respect to the composition control of the functional groups, the …
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Investigation of Microbiome Metabolites and Mitochondrial Function in a model of Non-Alcoholic Fatty Liver Disease
… N-oxide (TMAO) and phenylacetic acid (PAA) are microbiome-derived metabolites that have been associated with early onset of NAFLD. Hypothesising that these metabolites contribute to lipid deposition in the liver by altering hepatic mitochondrial function, we assessed how TMAO and PAA …
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Simulation studies to profile development and control of mixed-culture static and dynamic biofilms during extended raw beef processing operations using combinations of nanobubble water and peracetic acid
… combination with peroxyacetic acid (PAA)—a strong oxidizer commonly used in meat processing—to control mixed-species biofilm development on stainless steel (S304) and rubber (Buna-N) surfaces over extended processing times. Experiments were conducted under simulated beef processing …
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The Development of a New Cloning Strategy for the Biosynthetic Production of Brush-Forming Poly(Amino Acids)
… to produce a brush-forming poly(amino acid) (or PAA) with an exactly specified amino acid sequence, thus controlling the polymer's composition at a level unequaled by conventional organic polymer synthesis. The presented work demonstrates the cloning, expression, purification and characterization …
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Disinfection of fresh produce contaminated by enteric viruses and their inactivation mechanisms
… kale), disinfected with either peracetic acid (PAA) or a surfactant-based sanitizer, assuming that vegetables were irrigated with RV-contaminated water. As the disinfection efficacy of RV attached to the produce surface varied depending on the produce type and sanitizer, the health risks of RV …
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Chemical Surface Modification of Polycarbonate to Increase Hydrophilicity
… submerged in poly(acrylic acid-co-maleic acid) (PAA-MAA) solution, heated, rinsed in DI water, and dried with air. PEI introduced more amine groups than PPD, and PAA-MAA uses those amine groups to expose more polar carboxylic acid groups. PEI and PAA-MAA were tested by varying reaction conditions …
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Biphasic Nanoparticle Inks for Direct Write Assembly of Three-Dimensional Periodic Structures
… to stabilize them, either poly(acrylic acid)(PAA) or a comb polymer comprised of a PAA backbone and poly(ethylene oxide)(PEO) teeth (PAA/PEO). The PAA/PEO-coated nanoparticles remain stable, and hence behave as repulsive species in suspension under high ionic strength conditions or in the …
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