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 497 for “"Shielding"”.
-
Shielding Effectiveness of Superalloy, Aluminum, and Mumetal Shielding Tapes
Using MIL-HDBK-419A, MATLAB and Nomographs, Shielding Effectiveness for the Magnetic Field, Electric Field, and Plane Wave were calculated over a frequency range from 10 Hz to 1 GHz. The three shielding tapes used included superalloy, aluminum, and mumetal. Calculations for Shielding Effectiveness …
-
Radiation Shielding of Fusion Systems
… pipe. Future designs should include additional shielding around the beam pipe.
-
Enhancing network robustness via shielding
Shielding critical links enhances network robustness and provides a new way of designing robust networks. We first consider shielding critical links to guarantee network connectivity after any failure under geographical and general failure models. We develop a mixed integer linear program (MILP) to …
-
Radiation shielding calculations by means of MCNPX
Monte Carlo radiation transport calculations were performed to re-evaluate the configuration of the horizontal target bombardment station of the ra-dionuclide production at iThemba LABS. Calculated neutron and photon dose attenuation factors for this shield were compared with those previously …
-
Wind shielding in refining and petrochemical facilities
… probabilistic model to predict the magnitude of shielding that is provided by the vast network of pipe rack structures that encircle these densely arranged facilities. The probabilistic model is built from data obtained through a broad sampling of pipe rack configurations simulated with …
-
Space Radiation Assessment and Mitigation: Meeting the Growing Demand for Shielding Solutions by Enhancing Models and Exploring Novel Shielding Opportunities
… 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 radiation wavelengths. Furthermore, the …
-
Radiation Shielding calculations using MCNPX transport code for cost optimization of the shielding material to be used at iThemba LABS.
… from ionising radiation by providing adequate shielding to attenuate these particles, thus bringing their flux to acceptably low levels determined by the International Commission on Radiation Protection (ICRP) for designated personnel accessing this facility. The Monte Carlo for Neutral …
-
Simulating Space Radiation for Testing Shielding Material Effectiveness
… that includes the use of countermeasures such as shielding. A correct risk assessment relies on an accurate evaluation of the shielding effects of spacecraft structures on the incoming space radiation environment. Since the complicated shielding geometry plays an important role, existing transport …
-
Neutron shielding properties of mortars containing haydite aggregate
<p>http://www.worldcat.org/oclc/28358477</p>
-
Comparative Analysis of Electrodynamic Toroidal Radiation Shielding Configurations
… reduced or mitigated outright through radiation shielding. Because protons and other charged particles comprise most of these radiation particles, strong magnetic fields could be generated around spacecraft to deflect incoming charged radiation particles. This thesis investigates the performance …
-
Neutron Absorption Self-Shielding Factors in Activation Analysis
Made available in DSpace on 2017-07-06T18:49:04Z (GMT). No. of bitstreams: 3 Kirstein_Erik_S_MS.pdf: 34553387 bytes, checksum: fde921d66760107ce07c13230d4cbf57 (MD5) Kirstein_Erik_S_MS_ABS.pdf: 526029 bytes, checksum: 7f7a393a4aa77b7f53ed964a9bb6162b (MD5) license.txt: 4813 bytes, checksum: …
-
A diffraction integral based turbomachinery noise shielding method
… for the assessment of turbomachinery noise shielding in hybrid wing body aircraft. The preliminary design and assessment of novel aircraft configurations require both low computational cost and versatility of the shielding method. High fidelity methods, such as for example boundary element …
-
Absorption-Dominant Electromagnetic Interference Shielding Polymer Composites and Foams
… electromagnetic interference (EMI) shielding while mitigating secondary electromagnetic pollution. Despite the significance of structural and geometrical factors in creating high-performance absorption-dominant EMI shielding materials, systematic structure-property (i.e., EM wave …
-
Active Magnetic Radiation Shielding For Long-Duration Human Spaceflight
… of missions.</p> <p>Various methods of radiation shielding have been proposed, from simple passive</p> <p>shielding via materials such as water, polyethylene, or aluminum, to active shielding</p> <p>systems comprised of electromagnetic fields. The concept of active magnetic shielding</p> <p>is to …
-
Optimisation of GMAW via the alternating shielding gas technique
The use of the alternating shielding gas technique in arc welding systems has been previously studied due to advantages such as greater penetration of the weld joint, refined microstructure of the fusion zone, reduced heat input, and increased travel speeds of the welding torch. Yet, relatively …
-
Validation and verification of FLUKA for neutron shielding problems
… for any construction design. Radiation shielding properties of concrete may vary depending on the concrete composites. In this thesis, the fluences (i.e. the flux integrated over time) of neutrons impinging on the shielding nuclear material were studied using FLUKA Monte Carlo package. …
-
Novel Resonance Self-Shielding Methods for Nuclear Reactor Analysis
… cross section generation and resonance self-shielding. This work has two primary objectives: to quantitatively assess the efficacy of current self-shielding approximations and to propose new self-shielding methods. These objectives are cast primarily in the context of mutual self-shielding, …
-
Theoretical Prediction of Nuclear Magnetic Shielding Constants of Acetonitrile
Gauge invariant shielding constants calculations of ?H, ?C, and ??N were calculated for acetonitrile in the gas and liquid phases. Dierent basis sets as well as dierent ab initio and DFT methods were tested to select a time-ecient level of theory with reasonable accuracy. The eect of nuclear motion …
-
Evaluation of fast neutron shielding effectiveness in light-element compounds
Fast neutron shielding has important applications in accelerator facilities, reactor technology, space radiation protection programs, and in minimizing the dose in radiation facilities. Due to their ability to reduce neutron energy and their high absorption cross sections, lightweight and low …
-
Monte Carlo simulation of neutron shielding for proton therapy facilities
… develop a Monte Carlo method of modeling neutron shielding of proton therapy facilities in a complex, realistic environment. The bulk neutron shielding of the Northeast Proton Therapy Center (Massachusetts General Hospital, Boston, MA) was used as the basis of the design work. A geometrical model …
Page 1 of 25