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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 45 for “"space radiation"”.
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Simulating Space Radiation for Testing Shielding Material Effectiveness
The space radiation environment poses health risks to astronauts. There are three sources of space radiation: trapped radiation, Solar Particle Events, and Galactic Cosmic Rays (GCR) and these sources consist primarily of protons and heavier (HZE) ions. NASA has developed a radiation protection …
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Investigation of the bubble detector response to high LET space radiation
The radiation environment aboard spacecraft is a complex mixture of neutrons, photons, protons, heavy ions and other particles. A special type of superheated droplet detectors referred to as space bubble detectors (SBD) have been used to evaluate the equivalent dose due to neutrons in various space …
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Utilizing Permanent On-Board Water Storage for Efficient Deep Space Radiation Shielding
<p>As space technologies continue to develop rapidly, there is a common desire to launch astronauts beyond the ISS to return to the Moon and put human footsteps on Mars. One of the largest hurdles that still needs to be addressed is the protection of astronauts from the radiation environment seen …
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Space radiation-induced bystander signaling in 2D and 3D skin tissue models
Space radiation poses a significant hazard to astronauts on long-duration missions, and the low fluences of charged particles characteristic of this field suggest that bystander effects, the phenomenon in which a greater number of cells exhibit damage than expected based on the number of cells …
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Modelling and testing the effects of space radiation on space-borne electronic components
Outer space is a hazardous environment for satellites as they are continuously exposed to harsh space radiation in the form of cosmic rays and high-energy electrically charged particles (protons, electrons and alpha particles). Mission-critical electronic components are especially susceptible to …
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The effects of space radiation on a chemically modified graphite- epoxy composite material
… study was to characterize the effects of the space environment on the engineering properties and chemistry of a chemically modified T300/934 graphite-epoxy composite system. The material was subjected to 1.0 x 10¹⁰ rads of 1.0 MeV electron irradiation under vacuum to simulate 30 years in …
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Retrieval of Free Space Radiation Patterns through Measured Data in a Non-Anechoic Environment
… in a non-anechoic environment to obtain a free space pattern that would be measured in an anechoic chamber. Existing compensation techniques are like the Test Zone Field compensation method, the Fast-Fourier-Transform-based method, the Matrix Pencil method, and the Antenna Pattern Comparison …
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Space radiation environment impacts on high power amplifiers and solar cells on-board geostationary communications satellites
… telemetry data for scientific analysis of the space radiation environment effects on component anomalies or performance. We partnered with four geostationary (GEO) operators, acquired >1 million hours of telemetry, and combined these data with space weather observations to investigate …
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Bioastronautics: Biological Modeling of the Neural Response to Space Radiation and its interaction with Alzheimer's Disease Risk Genes
The exotic radiation permeating interplanetary space remains the least understood and perhaps most challenging intrinsic barrier to a sustained human presence beyond Earth. As the coming decade brings the promise of continuous lunar habitation and even the first voyage to another planet, …
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Space Radiation Assessment and Mitigation: Meeting the Growing Demand for Shielding Solutions by Enhancing Models and Exploring Novel Shielding Opportunities
… of vulnerable technology and human life in space have highlighted the need for improved shielding materials. Industry standard protocols for shielding are being pushed to their limits as we gain a deeper understanding of the harsh space environment and as chip sizes approach the scale of …
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SIMULATIONS OF SPACE RADIATION INTERACTIONS WITH MATERIALS, WITH APPLICATION TO DOSE ESTIMATES FOR LUNAR SHELTER AND ABOARD THE INTERNATIONAL SPACE STATION
… codes to investigate the interactions of space radiation with materials and quantify the biological dose onboard the International Space Station (ISS) and in a lunar shelter for future manned missions. High-energy space radiation of Trapped Protons, Solar Particle Events, and GCRs …
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Space Radiation Hazards in the Near-Earth Environment: A Simulation-Based Analysis of Effects on Spacecraft Electronics Using IRENE and the AE9/AP9 Models
Στην εργασία που ακολουθεί εξετάζονται ο κίνδυνος της ακτινοβολίας από φορτισμένα σωματίδια στο διαστημικό περιβάλλον και η πιθανή επίδρασή της σε διαστημικές αποστολές και τα ηλεκτρονικά τους. Η εργασία αρχίζει με μια θεωρητική ανάλυση του διαστημικού περιβάλλοντος. Στις δύο αυτές ενότητες γίνεται …
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Characterization of commercial step-down converter performance in the low Earth orbit radiation environment
… DC-DC 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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A PATTERN RECOGNITION APPROACH TO LEARNING TRACKS OF HEAVY-ION PARTICLES IN TIMEPIX DETECTORS
… develop an active personal dosimeter for use in space radiation environments. The work reported here is based on the Timepix chip, which when coupled with an Si sensor, can function as an active nuclear emulsion, allowing the visualization of the individual tracks created as the different …
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A Statistical Theory of Fragmentations of Nuclei by Light Projectiles and Macroscopic Theory to Incorporate Resonances in the Mean Field
Space radiation contains nuclei from hydrogen to nickel in various proportions. These nuclei collide with the shielding materials of spacecrafts causing the emission of secondary radiation, consisting of fragmentation of nuclei of the shielding materials by the incident nuclei, inside the cabin, …
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Radiation management, avionics development, and integrated testing of a Class-D space-based asteroid X-ray spectrometer
… and transfer this information to the main spacecraft computer for transmission to Earth. REXIS avionics accomplish these tasks using a mixture of commercial and spaceflight-grade hardware, reconfigurable Xilinx and Actel FPGAs, and a softcore MicroBlaze processor. Although the REXIS …
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Metamaterial enhanced coupling
… on. As a result, metamaterials can couple free space radiation in previously unheard of ways, and in this thesis I examine several of these coupling mechanisms. After an appropriate discussion of theoretical and experimental tools required for metamaterial study, the thesis turns to the …
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Neutron production in a spherical phantom aboard the international space station
Since the beginning of space exploration in last century, several kinds of devices from passive and active dosimeters to radiation environment monitors have been used to measure radiation levels onboard different space crafts and shuttles allowing the space community to identify and quantify space …
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Study of LaBr3 (Ce) detector response to high energy helium ions
The space radiation environment is a complex mixed field composed of neutral and charged particles such as photons, protons, alpha, and other particles. The mixture of these different particles creates a challenge in any accurate measurement with radiation detection devices. Lanthanum Bromide …
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Evaluation of the bubble spectrometer performance in space-like neutron fields
The Space Bubble Detector Spectrometer (SBDS) consists of six bubble detectors each with a different neutron energy threshold. To characterize the spectrometer in a space-like neutron field, a series of experiments were conducted with high-energy neutrons from 6.0×105 eV to 7.50 ×108 eV at the Los …
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