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 12 of 12 for “"High temperature exposure"”.
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Effects of elevated temperature exposure on cement-based composite materials
Concrete structures are considered to have higher degree of thermal and fire resistance than steel structures due to their non-combustible nature and low thermal conductivity. Despite concrete structures having high degree of thermal resistance, there is loss in mechanical properties and durability …
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Evaluation of Tungsten Hexachloride as a ROMP Active Catalyst Precursor for Self -Healing Polymers
… in self-healing materials is the relatively low temperatures at which they deactivate. An advantage of WCl 6 is that the high melting temperature (Tm=275°C) allows for the use of the catalyst in higher temperature applications. Typical polymer and fiber reinforced plastic processing …
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Durability testing of ceramic candle filters in pressurized-fluidized bed combustion environments
Ceramic candle filters were subjected to 500 hour high temperature/ high pressure (HTHP) exposure tests to examine their extended durability in simulated coal pressurized-fluidized bed combustion (PFBC) environments. The candle filter materials analyzed included two SiC filters, one with clay …
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Deciphering the role of dispersoids in dispersion-strengthened tungsten alloys on the mechanical properties and irradiation- driven response under nuclear fusion reactor-relevant conditions
… plasma- burning fusion reactors because of its high melting point, high sputter threshold, and low hydrogenic species retention. However, tungsten is an intrinsically brittle material, displaying no room temperature ductility and only exhibiting non-brittle failure at temperatures at high …
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Sources of high temperature degradation of cement-based materials : nanoindentation and microporoelastic analysis
The effects of high temperature exposure on cement-based materials have been under investigation for quite some time, but a fundamental understanding of the sources of high temperature degradation has been limited by measurement capabilities. Using recent developments in nanotechnology and …
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Novel integrated computational approach for designing Fe-Ni-based alloys
A novel computational approach for designing high temperature alloys is proposed; the approach incorporates properties prediction and optimisation. As for properties prediction, microstructural parameters, such as the volume fraction and precipitate size after heat treatment (replicating the …
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On the Rumpling Instability in Thermal Barrier Systems
… the BC surface in the BC-superalloy systems upon high temperature exposure. A combined experimental and analytical approach is taken to study the rumpling phenomenon. Thermal cycling and isothermal experiments are carried out in air and in vacuum to identify the driving force and the kinetics …
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Microhabitat, microbiota, mitochondria and the epigenome shape the biparental legacy of heat exposure in a tropical arthropod
… regarding climate change. Average global surface temperatures have risen by 1oC since pre-industrial levels, and it is estimated that temperatures will continue to rise by at least 1.5oC until at least 2100, despite mitigation efforts. The effect that such warming will have on biodiversity remains …
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Feasibility of Using Oxide Thickness Measurements for Predicting Crack Growth Rates in P91 Steel Components
… predicting the age of cracks that are found in high</p> <p>temperature structural components during service; among the promising ones is the oxide</p> <p>thickness measurement technique. Oxide thickness profiles are taken from crack surfaces of</p> <p>components and used for predicting the rates …
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The influence of prior creep damage on the fracture localisation in X20 CrMoV12-1 cross-weld creep tests
… few operating close to 300 000 hours. Main steam temperatures experienced in a power plant vary between 535-555°C. These operating conditions place main steam pipe components to operate within the creep regime. It is of utmost importance for safety and plant health that these critical components …
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Facile Synthesis of High Surface Area Molybdenum Carbide and Nitride: An Application in Support Materials for Oxygen Reduction Reaction
A method to synthesize high surface area α-MoC(1-x) without the temperature programmed reduction (TPR) of MoO3 is described. This method was then used, in conjunction with a novel in situ method to obtain highly dispersed PtMoz supported on α- MoC(1-x), to explore the suitability of such materials …
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AGRONOMIC AND ECO-PHYSIOLOGICAL RESPONSES OF BRASSICACEAE SUBJECTED TO BIOSTIMULANT TREATMENT AND ABIOTIC STRESS
… maximise the action of fertilisers, resulting in higher yields with fewer inputs. Additionally, biostimulants have demonstrated positive effects in resisting abiotic stress, such as drought, salinity, heat, and cold. Developing new biostimulant products involves a complex process involving several …