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 48 for “"Physics, Radiation"”.
-
Computational Modeling of the Axial-Cylindrical Inertial Electrostatic Confinement Fusion Neutron Generator
… fusion neutron generation rate and the plasma physics behavior using fundamental first principles. The CHIMP code is a time-dependent, spatially two-dimensional (r,z), particle-in-cell, Monte-Carlo-Collision (PIC-MCC) direct simulation model. The effects of secondary electron emission due to …
-
Radiation-Enhanced Diffusion and Defect Production During Ion Irradiation of MgO and Al(2)O(3)
Radiation enhanced diffusion of O$\sp{18}$, Ca and Zn buried tracer layers in MBE grown MgO was measured following irradiation with either 2.0 MeV Kr or 1.0 MeV Ne, He or H from 30 to 1500$\sp\circ$C. This represents the first reported RED measurements on an oxide system. Ion beam mixing at …
-
Floquet-Wave-Based Analysis of Transient Scattering From Doubly Periodic Structures
"In the past, transient scattering from doubly periodic structures has been analyzed predominantly using finite difference time domain methods. Unfortunately, for obliquely excited periodic structures, these solvers call for future field values to update current ones, and therefore cannot be …
-
The Boer-Mulders and Cahn Effects: Azimuthal Modulations in the Spin-Independent Sidis Cross Section at Hermes
These measurement would not have been possible without an improved hadron-type identification algorithm for the Ring Imaging Cherenkov (RICH) detector. The EVT event-level algorithm is presented and now is the primary method used at Hermes.
-
Interstitial-Impurity Trapping in Aluminum - Iron and Aluminum - Zinc
Made available in DSpace on 2015-05-13T15:22:17Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 8004194.PDF: 3284804 bytes, checksum: 3ca8cdba5173dd4fdbb68ef5ae8c53b2 (MD5) Previous issue date: 1979
-
Effects of Electron-Irradiation on P-Type Germanium at Liquid Helium Temperatures Using Ac Hopping Conductivity
Made available in DSpace on 2015-05-12T22:39:06Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7412164.PDF: 5595326 bytes, checksum: 11aedf0b1245045f7dcbd7c2848347b2 (MD5) Previous issue date: 1973
-
Low Energy Ion Bombardment Effects in Supersaturated Copper-Indium Alloys
… sputtering was increasingly compensated by radiation-assisted surface segregation. Even at room temperature, however, the steady state In concentration in the altered layer during irradiation, while reduced, remained supersaturated and enhanced diffusion to ion bombardment-created point …
-
An Investigation of the Current Source-Function Technique for Solving Problems of Electromagnetic Scattering
Made available in DSpace on 2014-12-12T20:54:24Z (GMT). No. of bitstreams: 1 7624095.pdf: 7798956 bytes, checksum: 125edc656143e6b2ab33af08c644935d (MD5) Previous issue date: 1976
-
A Linear Response Analysis of Electromagnetic Radiation Emanating From A Plasma
Made available in DSpace on 2014-12-08T22:24:42Z (GMT). No. of bitstreams: 1 7000990.pdf: 4940158 bytes, checksum: 682589e0d7fb6b32daeb8d3883d01b39 (MD5) Previous issue date: 1969
-
Optical Line Radiation From Uranium Plasmas
Made available in DSpace on 2014-12-14T06:26:04Z (GMT). No. of bitstreams: 1 7726707.pdf: 4318546 bytes, checksum: d577931c537335b244066f09ae81f5dc (MD5) Previous issue date: 1977
-
Calculations of neutron damage cross-sections in silicon, gallium arsenide and iron
The neutron cross-section processing code NJOY has been modified to calculate total displacements kerma cross-sections for silicon, gallium, arsenic and gallium arsenide. The modified NJOY is also used to calculate the displacement cross-sections for iron.
-
Chaos effects in one-dimensional hydrogen, including the high-frequency regime
The system of highly excited hydrogen in combined strong ac and dc electric fields is examined. It is shown that the production and maintainence of effectively one-dimensional states is plausible in this system. The threshold of global classical chaos is calculated using the resonance overlap …
-
Radiation Dosimetry in the Presence of Gold Nanoparticles
… nanoparticles (GNPs) to enhance the dose due to radiation, through increased photoelectric effect interactions, has shown promise in vivo and in vitro. Monte Carlo studies have worked towards quantifying the dose enhancement and the dosimetry surrounding GNPs. This thesis investigates the …
-
Use of Admittance-Wall Models in Analysis of Radiating Line Antennas
… shown that the general characteristics of the radiation patterns of ANSERLIN elements can be obtained using only a small number of circularly polarized spherical modes in the field expansion. A first-order model is obtained by solving for the fields of a closed waveguide with perfect electric …
-
The detection and measurement of the activity size distributions (d(p) greater than 0.5 nm) associated with radon decay products in indoor air
The infiltration of radon into the indoor environment may cause the exposure of the public to excessive amounts of radioactivity and has spurred renewed research interest over the past several years into the occurrence and properties of radon and its decay products in indoor air. The public health …
-
Interaction cross sections needed for simulation of secondary electron emission spectra from thin metal foils after fast proton impact
Monte Carlo simulations of secondary electron emission from thin metal foils after fast proton impact require reliable interaction cross sections with the target under consideration. Total and energy differential inelastic cross sections have been derived for aluminum, copper, and gold thin-metal …
-
Laser-driven implosion characterization by the analysis of charged-fusion-product energy spectra
Energy spectra of charged-fusion products escaping laser-imploded deuterium-tritium filled glass microballoon targets were measured with a time-of-flight (TOF) spectrometer. The TOF spectrometer was carefully designed, constructed and calibrated to simultaneously measure alpha-particles and protons.
-
Long wavelength infrared detectors utilizing multiple quantum wells in III-V compound semiconductors
Data are presented on various infrared detectors based on multiple GaAs/AlGaAs quantum wells. Due to the great flexibility in the growth, dimensions, and composition of these structures, the electrical and optical characteristics of the photodetector may be significantly altered. This investigation …
-
Numerical simulations of mass outflows from star-forming regions
… testing, and application of a two dimensional radiation magnetohydrodynamics (RMHD) code is described in detail. Well developed Eulerian hydrodynamic algorithms are used, but are implemented in a new covariant formalism which facilitates simulations in any orthogonal coordinate system. The …
-
Development of a System for Real-Time Measurements of Metabolite Transport in Plants Using Short-Lived Positron-Emitting Radiotracers
… gas from the target area at TUNL to a radiation-shielded cryogenic trap at the Phytotron, labeling of photoassimilates with <sup>11</sup>C, and <em>in vivo</em> gamma-ray detection for real-time measurements of the radiotracer distribution in small plants. The experimental techniques …
Page 1 of 3