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 80 for “"fissure"”.
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Durability and aging of dental fissure sealants
… of the sealant as a function of depth in the fissure to evaluate the thickness influence on the sealant mechanical properties. The strength and stiffness of the light-cured sealant varied as a function of depth in the fissure. This results in a gradient of deformation which could cause early …
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Evaluation of resin-based fissure sealants placed under field conditions
… identified for determining the effectiveness of fissure sealants placed under field conditions. AIM: To evaluate the caries preventive effect as well as retention status of a resin-based fissure sealant that was placed under field conditions as part of a school based sealant programme. …
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Flexural Strength of a Pit and Fissure Sealant Containing Microcapsules
… have on the flexural strength of pit and fissure sealant formulations. Pit and fissure sealants that contained microcapsules were incorporated into formulations at 5 w/w% of microcapsules (2 w/w% of 5.0 M Ca(NO3)2; 2 w/w% of 0.8 M NaF; 1 w/w% of 3.0 M K2HPO4) were added to pit and fissure …
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Biodegradable Polymeric Ion Releasing Fillers Effect on Pit and Fissure Sealant Properties
Introduction: New regulations in Europe require polymeric micronsized fillers to be biodegradable. The purpose of this research was to explore fabricated polymeric ion releasing fillers (PIRFs) that were made from alginate polymers and examined the effect of incorporating 3 different concentrations …
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Understanding the association between the presence of occlusal fissure calculus and caries
The pits and fissures of the tooth’s occlusal surface are the most vulnerable region of the tooth, accounting for over 80 percent of caries while making up only 13 percent of the overall tooth surface. However, it has also been shown that bacterial contents of the fissures may progressively …
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Impacts of SCUBA divers in the Silfra groundwater fissure : ecological disturbance and management
… that tourists visit. The Silfra groundwater fissure in the Thingvellir National Park has seen a rapid increase in the number of entrees, receiving just below 20.000 divers and snorkelers in 2014. This interdisciplinary thesis explored the relationship between the growing number of dive …
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Critical assessment of a proposed biostratigraphic scheme for Late Triassic fissure sediments from South West England
… of an extended project centered on Late Triassic fissure infillings in southwestern Britain, was organized into a biostratigraphic scheme in 1993. This scheme could prove important in correlating Late Triassic continental strata. The Cromhall data consists of taxonomic counts from individual …
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Sharp edges of the horizon: a fissure between “openness” and “emptiness” on the Tempelhofer Feld in Berlin
… offers a unique vantage point to work with a fissure between the terms of open and empty.
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Structural Controls of the MacFarlane Geothermal System, Humboldt County, Nevada: New Insights Based on Detailed Geologic Mapping, Shallow Temperature Surveys, and Magnetic Data
… MacFarlane hot springs and the travertine fissure ridges lie within a relay ramp. The relay ramp is formed between two overlapping, north-northeast-striking, west-dipping Holocene normal faults exposed in Lake Lahontan sediments. Other mapped faults near the hot spring include a …
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Clastic Dikes
… has invaded the containing rocks along a fissure either through a surface opening or a subsurface opening. The fissures have originated from earthquakes, folding, faulting, submarine slumping, or shrinage of the containing rock. Fissures are filled by sedimentation, injection, and …
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Comparison of two methods for sampling invertebrates on submerged vertical walls with diving
… scuba diving were made in Silfra, a freshwater fissure in Þingvellir National Park, southwest Iceland. A modified Surber sampler and a constructed manual suction pump sampling system were used to take 20 samples at two depths at a chosen transect in the fissure. After counting and classifying …
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Évolution des propriétés mécaniques des matériaux composites A1-6061-/A1₂O₃ /10-20%p après des traitements thermiques et corrélation entre les propriétés mécaniques et les dimensions fractales des surfaces de rupture
… l'écoulement du coulis d'injection dans une fissure. Basé sur le principe de modèles hydro-mécaniques déjà développés, le modèle intègre également le comportement rhéologique du coulis sous charge. Un programme d'essais d'injection de dallettes au laboratoire a été élaboré dans le but …
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Using linear inverse methods and finite element models to explore sensitivity to homogeneous elastic half-space assumptions in deformation models of the 2000 eruption of Hekla volcano, Iceland
… associated with the movement of a shallow fissure (i.e. dike) during the eruption (Ofeigsson et al., 2011). These data present the opportunity to use inverse methods to estimate parameters describing the behavior of the eruptive fissure (Fukushima et al., 2010, Anderson and Segall, 2011, …
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Evaluation of multiple and single emission peak light emitting diode light curing units effect on the degree of conversion and microhardness of resin-based pit and fissure sealant
… microhardness (KHN) of a resin-based pit and fissure sealant at various light curing times and two distances compared to a single emission peak LED LCU. Method: Sixty disks of resin-based pit and fissure sealant (Delton, DENTSPLY, York, PA) samples (6x1mm) were fabricated (n=5/LCU/group). …
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Who am I and what do I do? A Hermeneutic Phenomenological Study on the Experience of RNs and RPNs Working in the Same Environment.
… the participant conversations: The Dance and The Fissure. The Dance displays the experiences of empathy, comradery and teamwork lived by the nurses working in the dual-scope environment. The Fissure displays the lived experiences of role ambiguity and challenges nursing in a dual-scope …
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Abnormal Anatomy of the Auditory Cortex in Schizophrenic Brains with Auditory Hallucinations
… and planum temporale (PT), length of the Sylvian fissure (SF), length of the posterior extending ramus of the SF, and the morphological variants of HG, PT, and the posterior ramus. Evidence of morphologic variance or surface area differences in populations that are prone to experiencing auditory …
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A study of the Pine Portage Gold Prespect, Kenora district, Ontario
… </p> <p>The vein material occupies a sheared fissure and can be further divided into quartz-carbonate material regularly bounded by the headwall and a thin clay zone, quartz-carbonate material with sheared and altered schist, and brecciated amphibolite bounded by an irregular footwall. The …
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Potential for electrical power generation from dry geothermal sources
… crack was ued as a first approximation to the fissure geometry created by hydraulic fracturing of a well in which no subsequent fracture growth occurs. The initial model was later refined using a finite disk to model the fracture geometry. A finite thickness slab, infinite in extent, was used …
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Insular adaptations in the appendicular skeleton of Sicilian and Maltese dwarf elephants
… ancestor Palaeoloxodon sp. from Lparello Fissure, Sicily) suggest evidence of paedomorphism in the limbs. Similarly, comparisons of the ontogenetic allometry of the tibia in L. africana and P. ex gr. P. falconceri include changes which are also consistent with paedomorphism, although other …
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