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.
Results
Showing 1 to 20 of 125 for “"Extreme environments"”.
-
Ecotoxicology of Natural and Anthropogenic Extreme Environments
… in endemic molluscs and crabs from two natural extreme environments: deep-sea hydrothermal vents in the Lau and North Fiji Basin, and cold seeps in the Gulf of Mexico. In addition, the acute toxicity and sub-lethal effects of four insecticides and an herbicide are examined in the estuarine blue …
-
Phenotypic Switching of Bacterial Cells in Extreme Environments
… number of terrestrial microbial lives thrive in extremes of environmental conditions, including extremes of pressure, temperature, salinity, pH, and a combination of them. For example, all the marine biomass thrive at high hydrostatic pressure depending on depth. The temperature in the ocean can …
-
Microscale mechanical characterization of materials for extreme environments
… require outstanding strength and stability in extreme environments. Further improvements in the desirable mechanical properties of these materials require a better understanding of the relationship between their microstructure and grain boundary deformation behavior. Previous molecular dynamics …
-
Thermally Hardened RF GaN HEMTs in Extreme Environments
Traditional, room temperature electronics based on silicon has truly changed the world around us over the past 70+ years. However, many more applications still exist that are limited by the temperature performance of silicon devices (<250◦C). This area of high temperature (HT) electronics is an …
-
Magnetorheological fluids for extreme environments : stronger, lighter, hotter
The controllable properties of magnetorheological (MR) fluids offer reliable and efficient actuation means to a number of far-ranging engineering applications. In this thesis we are motivated by the applications of MR fluids in oil & gas exploration and production. These applications also bring …
-
Fungal biodiversity in extreme environments and wood degradation potential
… a multidisciplinary investigation of fungi from extreme locations, focusing on one of the driest and thermally broad regions of the world, the Taklimakan Desert, with comparisons to polar region deserts. Additionally, the capability of select fungal isolates to decay lignocellulosic substrates …
-
Molecular Dynamics Simulation Of Polymer Nanocomposites In Extreme Environments
… the responses of hybrid materials to harsh and extreme environments were studied. The goal of this research was to reveal the underlying mechanisms of damage mitigation in these materials and the role that interface, and relevant material component interactions play in the overall material …
-
Constraining chemical kinetics of uranium oxides in extreme environments
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
-
Atomistic simulations of chemomechanical processes in nanomaterials under extreme environments
… chemomechanical behavior of nanomaterials under extreme thermal and mechanical environments is of interest for a range of basic science and defense applications. By the limitation of experimental approaches for objects of nanometer, novel computational methods have been developed to investigate …
-
Multiscale corrosion of zirconium carbide, carbon, and CF/ZRC under extreme environments
… development of materials capable of withstanding extreme environments is critical for fields such as aerospace, energy, and defense, where conventional materials often fail. In the context of high-temperature air environments, such as those seen in hypersonics, highly reactive gas species, such as …
-
Assessing Structural Integrity using Mechatronic Impedance Transducers with Applications in Extreme Environments
This research reviews and extends the impedance-based structural health monitoring technique in order to detect and identify structural damage on various complex structures. The basic principle behind this technique is to apply high frequency structural excitations (typically higher than 30 kHz) …
-
In-situ synchrotron studies of turbine blade thermal barrier coatings under extreme environments
Thermal Barrier Coatings have been used for decades to impose a thermal gradient between the hot combustion gases and the underlying superalloy substrate in engine turbine blades. Yttria Stabilized Zirconia (YSZ) is an industry standard high temperature ceramic for turbine applications. The …
-
Benthic meiofaunal and micro-eukaryotic inhabitation of extreme environments: Submerged caves and hydrocarbon seeps
… dynamics in aquatic ecosystems. Many inhabit “extreme” environments with steep gradients in parameters such as oxygen, salinity, and organic matter availability, serving as natural laboratories for studying community structure and resilience. This thesis integrates molecular, geochemical, and …
-
Operation of silicon-germanium heterojunction bipolar transistors on silicon-on-insulator in extreme environments
… are especially interesting in the context of extreme environments - highly challenging surroundings that lie outside commercial and even military electronics specifications. However, fabricating HBTs on SOI substrates instead of traditional silicon bulk substrates requires extensive …
-
USE OF MOLECULAR APPROACHES TO STUDY THE OCCURRENCE OF EXTREMOPHILES AND EXTREMODURES IN NON-EXTREME ENVIRONMENTS
A number of samples were collected from various extreme and non-extreme environments. A range of molecular approaches, in addition to classical microbiology techniques, were used to isolate microorganisms, mainly archaea and bacteria from unusual environments. Halo-bacteria and archaea from …
-
A mathematical model to simulate physiological adjustments to extreme environments to analyse human responses to adverse environmental conditions
… among the most adaptable species on Earth, yet extreme environmental conditions impose significant limits to human performance, wellbeing, and survival. The study of human physiology in extreme environments is challenging due to the ethical and practical constraints of conducting experiments on …
-
A metabolomics approach for targeted isolation and production of bioactive secondary metabolites in microbial isolates from extreme environments
Marine microorganisms produce unique secondary metabolites, which are responsible for a variety of biologically active molecules with a wide range of pharmaceutical properties. There is a lack of novel effective drugs for metabolic diseases, cancer and parasite infections as well as TNF-alpha …
-
In-Situ Investigations of Calcium-Magnesium-Aluminosilicates (CMAS) Infiltration Effects on Thermal Barrier Coatings Under Extreme Environments Replicating Jet Engines
… exposes underlying metallic components to the extreme temperatures of the hot gas streams exiting the combustor. Therefore, it is paramount to dynamically capture and characterize the evolution of CMAS infiltration and its reaction kinetics under replicated service conditions and engine …
Page 1 of 7