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 32 for “"Proton-Irradiation"”.
-
PROTON IRRADIATION SAMPLE HOLDER II (PISH II)
… holder known as PISH I to hold samples during proton or alpha particle irradiation. The sample holder controls the temperature of the sample along with monitoring the beam current during experiments. This thesis explores the design and implementation of a new sample holder named PISH II. It …
-
Modeling the effects of proton irradiation [on] CIGS solar cells
… is very harsh on photovoltaic devices. Solar protons (hydrogen ions) cause large numbers of vacancies, which act as recombination centers at deep levels and can create compensating defects that reduce the acceptor concentration at shallow levels in semiconductors. This in turn, can reduce the …
-
Influence of environmental conditions and proton irradiation on molten salt corrosion of metals
… synergy efect of radiation and corrosion using protons as the irradiation source. Various interaction modes are discovered, including the deceleration of intergranular penetrating corrosion and the acceleration of transgranular penetrating corrosion. Protons are also recognized to push the …
-
Intermediate energy proton irradiation: An experimental and analytical foundation for bulk radiation damage testing
… deployment of these systems. However, existing irradiation test methods are either extremely slow or not able to predict macroscopic property changes. In some applications, the shortcomings of existing methods could be addressed by a new technique - intermediate energy proton irradiation (IEPI) …
-
Effects of Proton Irradiation on the Mechanical and Physical Properties of Carbon Nanotube Based Composites
In this study, the effects of proton irradiation on carbon nanotube (CNT)-epoxy composites are investigated for potential applications in radiation shielding for spacecraft. CNT-epoxy composites were prepared using multiwall and single wall CNTs and exposed to proton beams of energies ranging from …
-
Acute Effects of Whole-Body Proton Irradiation on the Immune System of the C57BL/6 Mouse
<p>The acute effects of proton whole-body irradiation (WBI) on leukocytes, lymphocytes, and hematological parameters in the spleen and blood of C57BI/6 mice were examined and compared to the effects of photon (gamma) WBI derived from a 60cobalt (60Co) source. Adult, female C57BL/6 mice were exposed …
-
Verification of The Clinical Implementation of The Respiratory Gated Beam Delivery Technique With Synchrotron-Based Proton Irradiation
<p>The clinical advantage for protons over conventional high-energy x-rays stems from their unique depth-dose distribution, which delivers essentially no dose beyond the end of range. In order to achieve it, accurate localization of the tumor volume relative to the proton beam is necessary. For …
-
An Experimental Determination of the Effect of Cyclic Stress on Void Growth in Ultra-High-Purity Aluminum During Simultaneous 800 Mev Proton Irradiation
Conditions of radiation and a simultaneous cyclic stress are inherent in advanced energy system designs, including magnetically and inertially confined controlled thermonuclear fusion reactors (CTR). Walter Green and Johannes Weertman (G & W) had predicted that edge dislocations, set into …
-
Comprehensive Analysis of Proton Irradiation Effects on 4H-SiC Power Devices: Characterization, Simulation, and Optimization for Enhanced Performance [Analisi completa degli effetti dell'irradiazione protonica sui dispositivi di potenza in 4H-SiC: caratterizzazione, simulazione e ottimizzazione per migliorarne le prestazioni]
… studio completo degli effetti dell'irradiazione protonica sui dispositivi di potenza in 4H-SiC. La ricerca mira a chiarire i tipi di difetti introdotti dall'irradiazione protonica, la loro risposta elettrica e la loro evoluzione con la temperatura di annealing. Sono state condotte …
-
Characterisation of CMOS APS Technologies for Space Applications
… Jade APS, is characterised in response to gamma, proton and heavy ion irradiation. Specific performance problems encountered during this radiation characterisation, such as dark current non-uniformity under gamma irradiation, random telegraph signals under proton irradiation, and single event …
-
The Effects of Mild Concussions and Pomegranates on Behavior
… pathology, protect mice from the effects of proton irradiation, and protect humans from post-operative cognitive deficits. This study investigated the behavioral and neuropathological effects of repetitive concussions in mice and the use of dietary supplementation with pomegranate to …
-
Application and analysis of the constant photocurrent method in studies on amorphous silicon and other thin-film semiconductors
… (pc-Si:H) and amorphous for highsilane content.Proton irradiation effects on undoped a-Si:H and pc-Si:H samples from PECVD and HWCVD deposition method were investigated by using steady-state photoconductivity and CPM experimental methods before and after 100 MeV proton irradiation. In contrast …
-
Emulating Radiation-Induced Defect Microstructures by Neutrons and Dark Matter Using Ions
… electron microscopy. Our results show how minor irradiation-induced defects evolve under different conditions and in different materials. Proton irradiation experiments tested olivine's viability as a paleo-detector for dark matter. The radiation damage in olivine involved the formation of …
-
Ultrafast Ionisation Dynamics Induced by Short Proton Pulses
… interactions. The absolute measurement of proton bursts as short as 3.7 ± 0.7 psis reported, enabled by the ultra fast decay pathways available to excited electrons in the formation of self-trapped excitonic states.The role of defects in the recovery of an induced opacity is examined in …
-
Annealing Cryogenically Irradiated High TemperatureSuperconductors with Current Pulses
… for critical current recovery. Using a cryogenic proton irradiation facility capable of applying current pulses as high as 2000A and as short as 100 ns, we found that a 400A pulse can display up to 400% critical current recovery with respect to the post-irradiation critical current value. The …
-
Energy relaxation in disordered insulators irradiated by ultrafast protons: a multiscale approach
… insulators irradiated with a burst of ultrafast protons using a multiscale approach. We begin with a phenomenological extension of the two-temperature model, which characterises the relaxation using two time-scales; a rapid electron-phonon relaxation rate and a longer "chemical" relaxation rate …
-
Development of detectors for the monitoring of mixed radiation fields
… evaluated under alpha-particle excitation and proton irradiation at different energies, including tests performed under therapeutic proton beams in a clinical environment. Comparative measurements with a commercial plastic scintillator demonstrate promising performance, highlighting the …
-
Real-time observation of particle interactions in matter using laser-driven accelerators
… using picosecond scale bursts of x-rays and protons generated via Bremsstrahlung and Target Normal Sheath Acceleration (TNSA) respectively, as the pump source and chirped light with an adjustable wavelength as the probe. The role of localised and delocalised particle interactions within …
-
High-Resolution Characterization of Micro-Scale Crack Tip Fields in Zirconium
… in plane stress conditions in accordance with proton penetration depths, such that the outcome from this research can be used to mimic irradiation effects with proton irradiation in the future. In this dissertation, two high-resolution experimental techniques, high (angular) resolution electron …
-
Synthesis and characterization of graphene: a raman study of the effect of electromagnetic and proton irradiations on graphene
… films were characterized and the effects of irradiation by an excimer pulsed laser (UV radiations), visible light (green) and proton irradiation were investigated. During the irradiations the dose of the radiation was varied in order to track the changes in the properties of the materials as …
Page 1 of 2