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 20 for “"cosmic radiation"”.
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Cosmic radiation topics
1v. (various pagings)
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Heavy nuclides in cosmic radiation.
Massachusetts Institute of Technology. Dept. of Physics. Thesis. 1969. B.S.
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Monte Carlo calculation and analysis of neutron and gamma fields at spallation neutron sources for simulating cosmic radiation
… level are very important since the neutron radiation is able to cause serious errors or damages on electronic components and system. TheWeapons Neutron Research (WNR) facility at Los Alamos Neutron Science Center (LANSCE), and ANITA (Atmospheric-like Neutrons from thIck TArget) facility at …
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A TECHNIQUE FOR MEASURING THE TIME RESPONSE AND THROUGH-PUT DELAY OF NEUTRON TIME-OF-FLIGHT (nTOF) SCINTILLATION DETECTORS USING COSMIC RADIATION IN A COINCIDENCE SYSTEM
… facility. However, an alternative method can use cosmic radiation to measure time response and through-put delay. Two plastic scintillator detectors in a coincidence system can detect an incident cosmic ray. If a third nTOF detector is placed between these coincident detectors, the output cosmic …
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A compact neutron spectrometer for detecting neutrons produced by cosmic rays
The high energy secondary neutron fields from cosmic radiation that are found in aviation and space environments have impacts on both biological and technological systems. A compact neutron spectrometer that is safe to operate in an aviation environment and suitable for detecting these secondary …
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OmicsSpace: A Proposed Omics Data Plan for NASA Human Research and Clinical Investigations
… spaceflight including exposure to solar and cosmic radiation, circadian rhythm shifts, body fluid shifts, altered levels of carbon dioxide and oxygen, and changes in ambient pressure. It is unknown at this point as to whether spaceflight can cause permanent changes to our genes and how they …
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A fault tolerant bus interface unit based on the nubus standardized bus architecture
… are susceptible to transient faults caused by cosmic radiation or alpha particles. In order for a system to be usable in such an environment, it must be designed to be upset tolerant. Functionality of the design must be intact in the presence of transient faults. Several standardized bus …
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Computer modeling and experimental work on the astrobiological implications of the martian subsurface ionising radiation environment
… a major environmental hazard is the ionising radiation field generated by the flux of exogenous energetic particles: solar energetic protons and galactic cosmic rays. The research reported here constitutes the first multidisciplinary approach to assessing the astrobiological impact of this …
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Implementation of a low cost demonstrator riometer on a flexible FPGA backend: The first steps in adding a riometer mode to the digital SuperDARN radar at SANAE IV
… the opacity of the ionosphere with respect to cosmic radiation. Doing this over a wide band of frequencies results in a spectral riometer. This dissertation describes the design and implementation of both a single frequency and a spectral riometer, both implemented on the Red Pitaya, and the …
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High-Fidelity Gravity Modeling Applied to Spacecraft Trajectories and Lunar Interior Analysis
… interest as possible habitation sites safe from cosmic radiation and micrometeorite impacts. Tools are developed to best exploit the rich gravity data toward the numerical detection of such small features.
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Utilizing Permanent On-Board Water Storage for Efficient Deep Space Radiation Shielding
… is the protection of astronauts from the radiation environment seen in deep space. The most effective way to defend against radiation is increasing the thickness of the shield, however this is limited by strict mass requirements. In order to increase the thickness of the shield, it is …
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Advanced Reconstruction Techniques for CUORE: Searching Beyond the Standard Model with Cryogenic Calorimeters
… could be present within the underground flux of cosmic radiation and would leave faint track-like signatures across the detector. We report on a search for FCPs using the first tonne-year of CUORE’s exposure, finding no excess of FCP track candidates over background, and setting leading limits at …
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Towards measuring the relative biological effectiveness of high-energy neutrons at iThemba LABS
… produced through the interac-tions of primary cosmic radiation with matter such as in spacecraft shielding, and in the atmospheres and regoliths of moons and planets. The development of radiation health-risk models for space exploration requires the quantification of the biological effects of …
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Characterisation and calibration of silicon photomultipliers for next-generation space detectors
… highquality scientific data. HERD (High Energy Cosmic Radiation Detection facility) is a future spaceborne particle detector that will employ SiPMs for precise charge measurement from Z = 1 to Z = 26 up to a few PeV and gamma identification [2], apart from other scientific objectives. The …
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Graphene and Related Materials Inks and Composites for Space Applications
… in low Earth orbit), ultra-high vacuum, solar radiation (1380 W/cm<sup>2</sup> at Earth radius), atomic oxygen, and galactic cosmic radiation, in addition to planetary specific environmental factors, like regolith, present complex challenges for material performance in space. Graphene and …
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The analysis and interpretation of VHE (Eg > 1 TeV gamma ray measurements
… with a strong stochastic component of background cosmic radiation, the data should be analysed by means of sound statistical techniques. The analysis of low counting statistics are treated, with the accent on periodic analysis. Existing statistical tests for uniformity on a circle are reviewed and …
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Pharmacological countermeasures for the prevention and treatment of toxic radiation exposure in space flight
Ionizing radiation toxicity in space poses a significant occupational risk to astronauts and is an area of critical concern for space traveling agencies. However, despite technological advances in other areas, a viable solution to this problem has not been developed. The focus of this capstone is …
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Effects of Proton Radiation on Behavior in a Mouse Model of Alzheimer’s Disease
… magnetosphere risk exposure to charged particle radiation that has been shown to cause neurological deficits in rodents via oxidative stress, neuroinflammation, altered neurogenesis, and synaptic changes. Since these responses are similar to those observed in age-related neurodegenerative …
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Sub-nanosecond Cherenkov photon detection for LHCb particle identification in high-occupancy conditions and semiconductor tracking for muon scattering tomography
… the first published semiconductor tracker for cosmic-ray muon scattering tomography is presented. The tracker uses silicon strip sensors from the ATLAS Semiconductor Tracker (SCT) with an 80μm pitch. A novel electronic readout system for the sensors is designed, based on a scalable, …