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 18 of 18 for “"Galactic Cosmic Rays"”.
-
The Interstellar Transport of Galactic Cosmic Rays
Using the Cosmic Ray Isotope Spectrometer: CRIS) onboard the Advanced Composition Explorer: ACE) spacecraft, new and improved high-precision measurements of the elemental composition and energy spectra of galactic cosmic rays with energies from 50-550 MeV/nucleon and nuclear charge 5<=Z<=28 are …
-
SOLAR MODULATION OF GALACTIC COSMIC RAYS: TECHNIQUES & APPLICATIONS (SHOCK ACCELERATION, ANTIPROTONS)
… four topics in the theory of interplanetary cosmic-ray propagation:</p><p>The first part involves the time-dependent, spherically-symmetric, solar modulation of galactic cosmic rays. A numerical technique was introduced for the solution of this problem. A model for the solar-cycle variation …
-
A Three Dimensional Green's Function Solution Technique for the Transport of Heavy Ions in Laboratory and Space
… risk of exposure to ionizing radiation, such as Galactic Cosmic Rays and Solar Particle Events, is of great concern. Consequently, steps must be taken to ensure astronaut safety by providing adequate shielding. The shielding and exposure of space travelers is controlled by the transport …
-
Probing and Raising the Lithium Problems With Hadronic Gamma Rays and Cosmic -Ray Nucleosynthesis
… lithium, CRs also produce ""pionic"" gamma-rays through pp → pi0 → gammagamma. Thus there is an intimate link between Li and gamma-rays produced in CR interactions. In this thesis we explore this link and use it as a new, model-independent way of testing the CR nucleosynthesis of …
-
Active Magnetic Radiation Shielding For Long-Duration Human Spaceflight
… delivered primarily by high energy ions from galactic cosmic rays and moderate</p> <p>energy protons from solar particle events. The chronic radiation dose due to galactic</p> <p>cosmic rays on a typical Mars mission is on the order of 1 Sv, and additional acute</p> <p>radiation dose from …
-
Simulating Space Radiation for Testing Shielding Material Effectiveness
… 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 strategy to limit risks that includes the use of countermeasures such as shielding. A correct risk assessment …
-
Computer modeling and experimental work on the astrobiological implications of the martian subsurface ionising radiation environment
… 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 radiation on Mars. A sophisticated computer model has been constructed de novo to characterise this …
-
An Integrated Omics Approach to Define the Molecular Mechanisms of Low Dose, High Charge, High Energy Irradiation (HZE) in Liver
Galactic Cosmic Rays are primarily composed of protons (85%), helium (14%), and high charge-high energy ions (HZE) such as 56Fe, 28Si, and 16O. Humans are normally not exposed to HZE ions but will be exposed during deep space travel such as upcoming missions to Mars and the dark side of the moon. …
-
Measuring and predicting radiation-induced soft errors in microprocessors
… High energy neutrons are the product of galactic cosmic rays entering the earth’s atmosphere. The accelerated measurements can be scaled to the terrestrial or at-altitude neutron flux to predict soft error rates. Neutron results are also an indicator of system vulnerability to other …
-
Investigating Extended Gamma-Ray Sources with ASTRI and CTAO: Observation, Analysis and Modelling
… thesis investigates the gamma-ray emission from Galactic sources with next-generation IACTs (Imaging Atmospheric Cherenkov Telescopes) like the telescopes of the ASTRI (Astrofisica con Specchi a Tecnologia Replicante Italiana) Mini-Array and CTAO (Cherenkov Telescope Array Observatory), with the …
-
Investigating Extended Gamma-Ray Sources with ASTRI and CTAO: Observation, Analysis and Modelling
… thesis investigates the gamma-ray emission from Galactic sources with next-generation IACTs (Imaging Atmospheric Cherenkov Telescopes) like the telescopes of the ASTRI (Astrofisica con Specchi a Tecnologia Replicante Italiana) Mini-Array and CTAO (Cherenkov Telescope Array Observatory), with the …
-
Particle-in-cell simulations of perpendicular supernova shock fronts
The origin of cosmic rays was the subject of several studies for over a century. The investigations done within this dissertation are one small step to shed some more light on this mystery. Locating the sources of cosmic rays is not trivial due to the interstellar magnetic field. However, the …
-
Long-term variation in cosmic-ray modulation
The transport of cosmic rays inside the heliosphere can be described b the Parker equation (Parker, 1965). Since there are no full analytica solutions to the Parker equation, two first-order approximate solutions o the equation can be derived, namely the Convection-Diffusion and th Force-Field …
-
Dating and Interpretation of Secondary Carbonate Deposits from the Last Interglacial
… by comparing the growth phases with the flux of Galactic Cosmic Rays reconstructed from deep sea sediments. These are probably affecting the condensation processes in clouds and accordingly, the Earth’s energy budget and latent heat transport processes. Spectral analyses that were applied on the …
-
Polyethylene-Based Multifunctional Composite Material for Radiation Shielding, Passive Thermoregulation, and In-Situ Fabrication for Space Exploration
… sources like energetic electrons, protons, gamma rays, and secondary particles, such as thermal neutrons, are abundant in low Earth orbit (LEO) and deep space environments like lunar and Martian surfaces, where space missions are often conducted. Such sources of space radiation can induce severe …
-
Comparative Analysis of Electrodynamic Toroidal Radiation Shielding Configurations
… and from outside the solar system in the form of Galactic Cosmic Rays (GCRs). The harm these particles do can be reduced or mitigated outright through radiation shielding. Because protons and other charged particles comprise most of these radiation particles, strong magnetic fields could be …
-
Evaluation of the performance of coherent optical communications commercial DSP ASICs in low earth orbit radiation environments
… to assess SEEs induced by heavy ions from galactic cosmic rays (GCRs) and solar energetic particles (SEPs), would provide additional insights on potential effects of the LEO radiation environment on the CL20010A1. Heavy ion test campaigns would provide SEE cross section data, which could be …
-
Utilizing Permanent On-Board Water Storage for Efficient Deep Space Radiation Shielding
… warning time, however, fails to protect against Galactic Cosmic Radiation (GCR) or Solar Particle Events (SPE) without sufficient warning. Utilizing these materials as a permanent shielding method throughout the mission could be a beneficial alternative to the Orion programs current protection …