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 131 for “"multipole"”.
-
Broadband Multilevel Fast Multipole Methods
… of algorithms consists of the so-called Fast Multipole Methods. These methods use a subdivision of the geometry into boxes on multiple levels, in combination with a decomposition of the Green function. For high frequency simulations, where the wavelength is smaller then the smallest features …
-
Giant multipole resonances in lead-208
"The differential photoneutron cross section of 208pb in the energy region 9.9 through 11.2 MeV was measured with gamma energy resolution of approximately 100 KeV using the University of 111inois bremsstrahlung monochromator. Neutrons from a 72% enriched 208pb target and an 88% enriched 206po …
-
Multipole Symmetries and Many Body Physics
… which conserve both a total charge and various multipole moments thereof. These conservation laws place constraints on the way in which particles can move, and carry important ramifications for both quantum ground states and non-equilibrium dynamics. Particular emphasis is placed on Hubbard …
-
Characteristics of a Multipole Volume H-Plasma
An experimental study of a filtered magnetic-multipole ion source has been carried out, in order to examine the characteristics of a plasma in which negative hydrogen ions are formed by volume processes. The ultimate object was to aid in understanding the mechanisms of volume H⁻ production, so …
-
Studies on Low Frequency Fast Multipole Algorithms
… at low frequencies, a novel mixed-form fast multipole algorithm is introduced. The conversion between the multipoles at low frequencies and plane waves at midfrequencies is needed during the aggregation and disaggregation processes. Both dense and diagonal translations are used for one FMA …
-
Magnetohydrodynamic ship propulsion using multipole magnetic fields
Thesis: S.B., Massachusetts Institute of Technology, Department of Electrical Engineering, 1965
-
Development of the Fast Multipole Method for Stratified Medium
The second part of this thesis is devoted to developing a fast algorithm to calculate the scattering by a perfect electrically conducting (PEC) body embedded in a single layer of a layered medium. A symmetric form of the dyadic Green's function is derived. All image scalar Green's functions within …
-
Windowed multipole : an efficient Doppler broadening technique for Monte Carlo
In this thesis, the windowed multipole method of Doppler broadening is developed from the multipole method. The multipole method is a pole and residue reformulation of the cross section data used in nuclear cross section data libraries. This form is advantageous as the Doppler broadened form is …
-
Studies of a D-3He Fueled Closed Surface Multipole Confinement Device
Made available in DSpace on 2017-07-06T18:48:11Z (GMT). No. of bitstreams: 3 Ghanbari_Ebrahim_MS.pdf: 24621605 bytes, checksum: e40a7f0f5c546d34c493acae77ef55ed (MD5) Ghanbari_Ebrahim_MS_ABS.pdf: 521383 bytes, checksum: 3d3c4f4eb6dee1438935511c245866d4 (MD5) license.txt: 4813 bytes, checksum: …
-
Multilevel Multipole -Free Fast Algorithm for Electromagnetic Scattering Problems in Layered Media
Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs
-
Fast multipole acceleration of periodic Green's function using spherical harmonics and Ewald summation
In this thesis, we present a fast multipole algorithm (FMA) for solving a periodic scattering problem using method of moments (MOM). The difference between the standard integral equations (EFIE and MFIE) and the ones used for periodic geometry is the use of periodic Green's function (PGF) over …
-
Electric multipole moments and higher-order topological phases in crystalline insulators and superconductors
… boundary signatures fractionalized. These higher multipole moments then correspond to new symmetry-protected topological phases (SPTs). A salient signature of these SPTs is the existence of zero-dimensional, corner-localized mid-gap energy states. We then study topological crystalline …
-
Analysis and design of multipole, super-conducting rotating electric machines for ship propulsion.
Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Thesis. 1974. M.S.
-
A Monte Carlo framework for nuclear data uncertainty propagation via the windowed multipole formalism
… proposed framework is the use of the windowed multipole formalism for calculating the sensitivities. The use of the windowed multipole formalism provides a natural, physics-inspired binning strategy for the sensitivity coefficients, while also aiding in the statistical convergence of the …
-
Flux-Independent Uncertainty Propagation of Nuclear Cross Section Data Using the Windowed Multipole Formalism
… portion involves the determination of Windowed Multipole (WMP) parameter uncertainty from continuous energy cross section uncertainty data. WMP parameters present a path forward for flux-independent uncertainty propagation in the resolved resonance region. While a library of WMP parameters …
-
Automatic synthesis of high performance translation operators and execution plans for the fast multipole method
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-08-01
-
On-the-fly Doppler broadening using multipole representation for Monte Carlo simulations on heterogeneous clusters
… In this thesis, a novel approach, based on the multipole representation, is proposed to reduce the memory footprint for the cross sections with little loss of efficiency. The multipole representation transforms resonance parameters into a set of poles only some of which exhibit resonant …
-
A spatially resolved study of the KATRIN main spectrometer using a novel fast multipole method
… the development of a novel variation on the Fast Multipole Method (FNM), which is a hybrid of the canonical algorithm and the Fast Fourier Transform on Multipoles (FFTM) method. This hybrid technique has been implemented to take advantage of scalable parallel computing resources and has been used …
Page 1 of 7