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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 105 for “"pastes"”.
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Verifying the Calcium Oxychloride Threshold in Cementitious Pastes
<p>Calcium oxychloride (CAOXY) formation is a serious deterioration mechanism known to cause joint damage in concrete pavements. CAOXY is the product of a chemical reaction between calcium chloride (CaCl2) or magnesium chloride (MgCl) deicing salts and calcium hydroxide in the cementitious matrix. …
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Methods for Zinc Ion Release from Orthodontic Cement Pastes
… to release zinc from orthodontic cement pastes. Microencapsulation and bioactive zinc glass were the two technologies studied. The cements were tested in neutral and acidic conditions as well as in the presence of competing ions. Results demonstrated competing ions cause zinc release …
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Fluoride uptake by enamel from stannous fluoride and prophylaxis pastes
The purposes of this study were twofold: (1) to determine whether applying zirconium silicate prophylaxis paste (containing nine per cent stannous fluoride) prior to topical application of 10 per cent aqueous solution of stannous fluoride would promote a significantly greater enamel fluoride uptake …
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On-line non-destructive ultrasonic rheology measurement of solder pastes
… techniques for monitoring the quality of solder pastes during the production and packaging stage are usually based on the viscosity measurements of the solder pastes from the viscometer and rheometer. One of the potential limitations of viscometer- and rheometer-based measurements is that the …
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Ultrasonic wave reflection measurements on self-compacting pastes and concretes
… the setting and stiffening of self-compacting pastes and concretes. An additional objective was to interpret the UWR responses of various modified cement pastes. A polymeric buffer with acoustic impedance close to that of cement paste, high impact polystyrene, was chosen to obtain sensitive …
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Significance of nanosilica incorporation in type G oil well cement pastes
… characterization of the hardened cement pastes was investigated using axial compression, rapid chloride-ion penetration test (RCPT), and axial degradation/damage progression analysis and quantification after carbonic acid exposure testing. Degradation testing was performed by simulating …
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Computer-Aided Formulation of Magnetic Pastes for Magnetic Components in Power Electronics
… and pressure-less process-ability, magnetic pastes would be the material of choice to make magnetic cores with complex geometries. However, most magnetic pastes reported in the literature suffer from low relative permeability (µr < 26) due to the low magnetic fraction limited by viscosity. …
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Effect of Antibiotic Pastes on Chemical Structure and Microhardness of Radicular Dentin
… from minocycline. The effect these pastes have on radicular dentin is unknown. Objectives: The aim of this study was to investigate the effects of two intracanal medicaments used during endodontic regeneration, TAP and MTAP, at concentrations of 1 g/mL and 1 mg/mL, on the …
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Formulation, development, and characterization of magnetic pastes and epoxies for thick film inductors
… aimed at the formulation of thick film ferrite pastes and ferrite epoxies and the design, construction, and evaluation of thick film spiral inductors. Wideband characterization (DC - 2GHz) of ferrite pastes, ferrite epoxies, and ferrite substrates is performed using two techniques. These …
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Effect of prophylaxis pastes containing amorphous calcium phosphate and fluoride on enamel bond strength.
Effect of prophylaxis pastes containing amorphous calcium phosphate and fluoride on enamel bond strength.
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Rheological characterisation of solder pastes and isotropic conductive adhesives (ICAs) for microsystems assembly technology
The printing of solder pastes through very small stencil apertures required for flip-chip pitch sizes, is expected to result in increased stencil clogging and incomplete transfer of paste to the printed circuit board pads. The paste printing process depends on conditions such as good paste roll, …
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Scaling the rock : a micromechanical model for the elastic properties of hydrated cement pastes
Cement is the most widely produced material worldwide. However, the understanding on how its nanoscale composition affect its microscale mechanical properties is limited. In this thesis, a micromechanical model for the purpose of cement hydration simulation was developed and tested using …
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The elastic properties of calcium leached cement pastes and mortars : a multi-scale investigation
Calcium leaching induced aging in concrete creates a new material with degraded macroscopic mechanical properties. Although the degradation of strength has been elaborately studied in the last decade, the degradation of elasticity has not been investigated in the same depth. This thesis presents a …
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Characterisation of lead-free solder pastes and their correlation with the stencil printing process performance
Solder pastes are complex materials whose properties are governed by many factors. Variations exhibited in solder paste characteristics make it increasingly difficult to understand the correlations between solder paste properties and their printing process performance. The recent EU directives on …
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Bioactive capabilities explored in polyurethane microcapsules and the inclusion into dental sealants and cement pastes
… microcapsules within dental sealants and cement pastes contain bioactive properties and are promising for remineralization.
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Development of Optimization Models for the Set Behavior and Compressive Strength of Sodium Activated Geopolymer Pastes
… predicting compressive strengths of geopolymer pastes from their mix design to within about 1 ksi of their actual strength. In addition to this the optimization models give valuable insight into the key factors influencing strength development as well as the key factors responsible for flash set …
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Redefining Egyptian “pastes”: material characterisation and technological developments in Third Intermediate Period coffin sets from Thebes
… of coffins, often collectively referred to as “pastes,” have received relatively little scholarly attention. These materials may encompass plasters but also gypsum or crushed limestone bound with organic media, sometimes incorporating clay minerals and plant fibers. Pastes served multiple …
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Irradiated recycled plastic as a concrete additive for improved chemo-mechanical properties in hardened cement pastes
Portland cement based concrete production contributes heavily to greenhouse gas emissions. Thus a need exists for the development of durable and sustainable concrete with a lower carbon footprint. This can be achieved when Portland cement is partially replaced with another material without …
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