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 22 for “"radiation tolerance"”.
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Uncovering the fundamental driver of semiconductor radiation tolerance
Radiation damage is a prominent cause of device failure in orbit, but we do not currently understand what innate property allows some semiconductors to sustain little damage while others accumulate defects rapidly with dose. These devices include circuits required for control and communication as …
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Development of dense scintillating hard fluoride glasses for the electromagnetic caorimeter of the proposed compact muon solenoid
… A low dose rate (1.2 rads- I) 60CO irradiation has been used to determine the radiation tolerance of the glasses. Radiation induced optical absorbance was predominantly located in the UV with tails extending into the visible region. These glasses show partial recovery of optical …
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Continuous low dose rate irradiation of the rat brain
… fractionated and continuous low dose rate irradiation has been reported for skin, however, no such relationship has been reported for the brain. Low dose rate protocols that are equivalent in effect to fractionated (conventional) protocols can be derived using the linear quadratic theory, …
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Characterization of commercial step-down converter performance in the low Earth orbit radiation environment
… converters for the Low Earth Orbit (LEO) space radiation environment. Commercial space industry is shifting spacecraft design philosophy toward accepting more risk for shorter lead times, lower costs, and high instrument performance. This shift opens up the Commercial Off The Shelf (COTS) …
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Developing Fixed-Bias Langmuir Probes for Multi-Point Constellation Deployments
… and pre-flight calibration. The process of radiation tolerance assurance for the ELP is considered in further detail; however, as the ESCAPADE satellites have yet to take flight, we follow this discussion with a presentation of data from the SpEED Demon deployable subpayloads, noting …
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Advanced characterizations of austenitic oxide dispersion-strengthened (ODS) steels for high-temperature reactor applications
… not only pinning dislocations but also trapping radiation-induced defects, oxide dispersion-strengthened (ODS) steels provide excellence in mechanical strength, creep resistance, and radiation tolerance. In order to develop ODS steels with qualifications required by advanced nuclear applications, …
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Investigation of focused Very High Energy Electrons (VHEEs) as a new radiotherapy method
… any dose escalation in the tumour is limited by radiation tolerance of healthy tissues,including skin, which is among the most sensitive tissue. An improved efficiency can be accomplished at the cost of irreversible damage to these tissues. A similar problem is found when high doses are delivered …
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Building the Future: HL-LHC ATLAS Upgrades and Event-Topology-Based Principles to Search for New Physics with Missing Transverse Momentum
… Chip (AMAC) is presented. Additionally, the radiation tolerance testing of AMAC and a commercial GaN FET are performed in a series of radiation environments. The testing of both devices are performed with device-specific electronics. In the case of GaN FET testing, a dedicated GEANT4-based …
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Vivid: An Operating System Kernel for Radiation-Tolerant Flight Control Software
… the challenge of defending flight software from radiation errors without a radiation-hardened processor. A new real-time operating system, Vivid, explores the use of redundant multithreading to protect critical software components from radiation errors, and offers new abstractions to reduce the …
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Resource-constrained avionics design for CubeSats
… power, volatile memory, non-volatile memory, and radiation tolerance) in a quantitative optimization analysis. We present the avionics hardware design for the Microwave Radiometer Technology Acceleration (MiRaTA) 3U CubeSat, funded by the NASA Earth Science Technology Office (ESTO), as a case …
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Characterisation of radiation effects in ultra-thin GaAs solar cells for space applications
… in space power systems for particularly harsh radiation environments, due to their high intrinsic radiation tolerance. The work presented in this thesis focuses on such a cell design, incorporating an 80 nm thick GaAs absorber layer, and furthers the understanding of the electrical behaviour of …
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Design and Implementation of a Radiation Hardened GaN Based Isolated DC-DC Converter for Space Applications
Power converters used in high reliability radiation hardened space applications trail their commercial counterparts in terms of power density and efficiency. This is due to the additional challenges that arise in the design of space rated power converters from the harsh environment they need to …
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Atomistic simulations of radiation damage in amorphous metal alloys
… studies have characterized the atomic-level radiation response mechanisms in irradiated crystalline alloys, comparatively little is known regarding the mechanisms of radiation damage in amorphous alloys. Knowledge of collision cascade dynamics is lacking, both with respect to the possibility …
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Formation and growth of irradiation-induced defect structures in ceria
Radiation damage effects are of primary concern for materials used in nuclear energy production. In this study, emphasis was given to the processes of formation and growth of radiation-induced defect structures in oxide fuels. Due to the natural complexity of oxide fuels, which consist of both a …
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Modeling Radiation Damage in Nanostructured Ferritic Alloys: Helium Bubble Precipitation on Oxide Nanofeatures
… generation of nuclear reactors call for more radiation tolerant materials. One such material, nanostructured ferritic alloys (NFA) are a candidate material for use in cladding. The radiation tolerance of NFAs comes from the high number density of small oxide nanofeatures composed of Y, Ti, and …
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Growth and Characterization of (InxGa1-x)2O3, and NiO Heterostructures
… high electric breakdown field (~ 8 MVcm-1), hard radiation tolerance, physical and chemical stability in the harsh environment, as well as its suitability for mass production compared to their SiC and GaN counterparts. Pulsed laser deposited (PLD) NiO/ β-(InxGa1-x)2O3 heterostructure was …
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Investigating the Optical Link Performance of the End-of Substructure Card and Susceptibility to SEUs
… it design challenges in relation to the harsh radiation environment and significant data throughput required. The ATLAS experiment is building a new detector to cope with these challenges, titled the Inner Tracker (ITk). A crucial part of this new detector is the End-of-Substructure (EoS) card, …
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Atomistic simulations of driven alloys: a study of effective temperature models for low and high temperature applications
… under severe plastic deformation (SPD) or irradiation form non-equilibrium microstructures at steady-state with microstructural features of a characteristic length scale that are stable over prolonged processing times. Such alloys have been termed ‘driven alloys’ as these steady-state …
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Ultra-thin GaAs Photovoltaics for Space Applications
… photovoltaics (<100 nm) have shown an intrinsic tolerance to radiation-induced damage which makes them a potentially advantageous power source for spacecraft which need to withstand harsh environments outside Earth’s atmosphere. In the ultra-thin regime, high transmission losses can be mitigated …
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Probabilistic risk assessment of system-level radiation effects
System-level radiation effects analysis is performed using a time-dependent Probabilistic Risk Assessment (PRA) methodology. Data-driven models for the expected behavior of radiation-sensitive parts are instanced in a system model for Fault Tree Analysis (FTA). The system model is then solved using …
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