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Showing 1 to 20 of 60 for “"Tbc"”.
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Modeling Interfacial Thermal Transport with Molecular Dynamics: The Challenge of Making Accurate Comparisons to Experiment
… enough to predict thermal boundary conductance (TBC) values – the primary quantity characterizing interfacial heat transport – that are consistent with experimental values. In this work, I investigate ways of improving MD simulations using three example interface systems: Ge-GaAs, Al-Al2O3, and …
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Geometric Effects of Thermal Barrier Coating Damage on Turbine Blade Temperatures
<p>Thermal barrier coatings (TBC) found on turbine blades are a key element in the performance and reliability of modern gas turbines. During the life of the turbine components, the TBC surface may be damaged due to manufacturing imperfections, handling damage, service spalling, or service impact …
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In situ control of lubricant properties for reduction of power cylinder friction through thermal barrier coating
… of insulation or thermal barrier coating (TBC) as a means of reducing local oil viscosity and power cylinder friction in internal combustion engines with minimal side effects of increased wear. TBC is selectively applied to the outside diameter of the cylinder liner to increase the local …
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Bonding mechanisms in the application of thermal barrier coatings to turbine blades.
Thermal barrier coatings (TBC's) are used to protect gas turbine blades from environmental degradation as well as to increase thermodynamic efficiency. Most TBC systems consist of a ceramic thermal barrier coating such as partially stabilized zirconia adhering to an oxidation resistant bond coat, …
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Equipping Leaders at Truth Baptist Church in Philadelphia, Pennsylvania, Toward a Biblical Stewardship of the Body
… and fitness surveys. A voluntary focus group of TBC participants were willing to have their knowledge of health and fitness pre-tested through a pre-course survey. Acknowledging the TBC leadership team’s current level of health, as well as their fitness awareness, was instrumental in the …
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Database consistency in cloud databases
… a tree-based consistency approach, called TBC, that reduces interdependency among replica servers to minimize the response time of cloud databases and to maximize the performance of those applications. We compare different techniques of maintaining consistency, including the classic …
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Synchrotron X-Ray Diffraction and Piezospectroscopy used for the Investigation of Individual Mechanical Effects from Environmental Contaminants and Oxide Layer Undulations in Thermal Barrier Coatings
<p>The durability of Thermal Barrier Coatings (TBCs) used on the turbine blades of aircraft and power generation engines has been known to be affected by sand particle ingression comprised of Calcium-Magnesium-Alumina-Silicate (CMAS). Previous studies have shown that these effects present …
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On the oxidation of high-temperature alloys, and its role in failure of thermal barrier coatings
Thermal barrier coating (TBC) systems are applied to superalloy turbine blades to provide thermal insulation and oxidation protection. A TBC system consists of (a) an outer oxide layer that imparts thermal insulation, and (b) a metallic layer that affords oxidation protection for the substrate …
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La tuberculosis en los hospitales generales de Andalucía. Estudio multicéntrico.
… caracteristicas de la enfermedad tuberculosa (tbc) en nuestro medio, evaluar la metodologia y tecnicas de diagnostico utilizada y valorar las pautas de tratamiento y evolucion final de los pacientes, se realizo un estudio multicentrico en el que participaron 7 hospitales generales de 5 …
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Modelling Thermal Conductivity of Porous Thermal Barrier Coatings for High-Temperature Aero Engines
Thermal Barrier Coatings (TBC) are used to shield hot sections of gas turbine engines, helping to prevent the melting of metallic surfaces. TBC is a sophisticated layered system that can be divided into top coat, bond coat, and the super-alloy substrate. The highly heterogeneous microstructure of …
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Elucidation of the epithelial sodium channel as a salt taste receptor candidate and search for novel salt taste receptor candidates
… could be localized to human taste bud cells (TBC). Thus, basolateral αβγ-ENaC ion channels are likely in TBC of circumvallate papillae, possibly mediating basolateral sodium entry. Similarly, basolateral βγ-ENaC might play a role in fungiform TBC. Strikingly, δ-ENaC subunit was confined to …
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Investigation into the optimal cooling configuration for a gas turbine airfoil utilizing a thermal barrier coating
… it was found that the addition of a 0.84D thick TBC to an internally cooled flat plate yields a 130% improvement in the overall cooling effectiveness. This result along with increased reliability of TBCs suggests that TBCs should be considered when determining optimal integrated cooling …
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Particle Size, Gas Temperature, and Impingement Cooling Effects on High Pressure Turbine Deposition in Land Based Gas Turbines from Various Synfuels
… before impinging on a thermal barrier coated (TBC) target button at 1183°C. Particle size was found to have a significant effect on capture efficiency with larger particles causing considerable TBC spallation during a 4-hour accelerated test. In the second series of tests, different gas …
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Nondestructive Evaluation of Engine Run Turbine Blades Using Laser Ablation and Photoluminesence Stress Measurements
<p>Thermal barrier coating (TBC) systems are an integral part of today’s engine parts. The ceramic coatings offer protection from thermal loads imposed on components such as turbine blades. Coated engine parts are currently taken out of operation based on group data when statistical minimums are …
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THE EFFECTS OF VITAMIN-C ON THE PHARMACOKINETICS OF CAFFEINE IN ELDERLY MALES
… of distribution (V), total body clearance (TBC), renal clearance (RC), and metabolic clearance (MC) of caffeine were determined. Simultaneous plasma (PVC), whole blood (WBVC), and leukocyte (WBCVC) vitamin C concentrations were obtained. All of the mean vitamin C values determined at the …
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Heat dissipation from carbon nano-electronics
… properties - thermal boundary conductance (TBC) and thermal conductivity - of CNTs and single-layer graphene in contact with an amorphous SiO2 (a-SiO2) substrate. First, the theoretical methodologies and concepts used in our simulations are presented. In particular, two concepts are …
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Atomistic and finite element modeling of zirconia for thermal barrier coating applications
… been widely used for thermal barrier coatings (TBCs). When TBC is exposed to thermal cycling during real applications, the TBC may fail due to several mechanisms: (1) phase transformation into yttrium-rich and yttrium-depleted regions, When the yttrium-rich region produces pure zirconia domains …
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Studies of proteins implicated in the folding and processing of tubulin
… CAP-Gly domain of tubulin binding cofactor B (TBC-B). Enzymes involved in posttranslational modifications of tubulin, tyrosine ligation and deacetylation, were also investigated. These projects did not result in crystal structures, but are discussed in chapters 5 and 6.In chapter 3, the …
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The Development of an Accelerated Testing Facility for the Study of Deposits in Land-Based Gas Turbine Engines
… air plasma sprayed (APS) thermal barrier coat (TBC) material coupons donated from industry. These conditions are typical of a modern, first stage nozzle. Investigations over a range of impingement angles yielded samples with deposit thicknesses from 50 to 200µm in 4-hour, accelerated-service …
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Experimental Investigation of Particulate Deposition on a Simulated Film-Cooled Turbine Vane Pressure Surface in a High Pressure Combustion Facility
… erode or react with thermal barrier coatings (TBC). A study was performed to examine the evolution and contributing factors to the growth of deposit structures in a simulated gas turbine environment. Tests were performed in the high pressure/temperature aerothermal facility at the Department of …
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