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.
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Showing 1 to 20 of 25 for “"multipoles"”.
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Multipoles, Magnetic charges and chiral properties in antiferromagnetic materials inferred from resonant X-Ray diffraction
… can be related to the magnetic and charge multipoles defined by a few electrons around the atomic core in the valence states. The uses of x-rays and neutrons techniques, due to the huge development of large facilities as synchrotrons and spallation sources, have revealed many of these …
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Bi-anisotropy, Non-Locality and Theory of Electromagnetic Multipoles for High Performance Smart Electromagnetic Skins (SES)
L'abstract è presente nell'allegato / the abstract is in the attachment
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Dark energy and CMB anisotropy
… dark energy as a mechanism for suppressing low l multipoles through late-Universe evolution of metric fluctuations and the integrated Sachs-Wolfe (ISW) effect. We find that for a constant dark energy equation of state, theoretical predictions actually give a larger (instead of a desired smaller) …
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Measurements and implications of the SDSS DR7 galaxy angular power spectrum
… calculate the angular power spectrum for ℓ ≤ 200 multipoles by using 40 bands for the full area data, ℓ ≤ 1000 multipoles using 50 bands for individual stripes, and ℓ ≤ 1600 multipoles using 64 bands for a selected area near the North Galactic Pole at high resolution. We also calculate the angular …
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Assessing and developing methods to explore the role of molecular shape in computer-aided drug design
… this purpose, e.g. shape fingerprints and shape multipoles. Both methods describe the shape of molecules, discarding any chemical information, using numerical values. Focusing only on shape can lead to identifying novel core structures of molecules, with improved properties. Molecular …
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Molecular dynamics investigation of the long wavelength dielectric response of classical dipolar liquids using Bloch function methods
… momenta are periodic, as in PBCs, but the charge multipoles in image cells are changed in phase controlled, by a wavevector within the first Brillouin Zone, q, that is characteristic of the boundary conditions. In such cases, the accessible wavevectors are then all shifted by q, and so the minimum …
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Separation of the E2 and M1 form factors of the 6.32 MeV state of nitrogen-15 using (electron,electron'gamma)
… is the first model independent separation of the multipoles that contribute to a mixed transition. Data were obtained with the MAMI A electron accelerator at momentum transfers q = 0.40, 0.63, 0.83, 1.1, and 1.2 fm$\sp{-1}$. Analysis of the data at q = 0.63 and 1.1 fm$\sp{-1}$ is reported here.
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Studies on Low Frequency Fast Multipole Algorithms
… 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 matrix-vector multiplication. This method can effectively …
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Projected Angular Statistics for Large-scale Structure Cosmology
… is highly accurate even at low spherical multipoles. The integration over the line-of-sight wave-modes is accelerated by applying the FFTLog algorithm to the 3D matter power spectrum; the resulting integrals can be evaluated analytically in terms of modified Bessel functions. We develop a …
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Measurement of the partial cross-sections sigmaTT, sigmaLT and sigmaT + epsilon-sigmaL of the p(e,e'pion+)n reaction at the Delta(1232) resonance
… and permit isospin decomposition of the multipoles.</p>
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The clustering of galaxies in hierarchical galaxy formation models
… large scales the two approaches agree, but for multipoles with l>500 the results differ significantly, with the hybrid approach being the more accurate.
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Study of transverse excitations in the giant resonance region of 236U using the (e,e'f) reaction.
… well described by the inclusion of the electric multipoles of L = 0, 1, 2 and 3 transitions. For higher momentum transfers and backward angles higher multipolarities are needed. Comparison of our results with the forthcoming QRPA calculations for uranium will show the importance of the effects of …
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A spatially resolved study of the KATRIN main spectrometer using a novel fast multipole method
… 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 to solve the Laplace boundary value problem using the Boundary Element Method with millions of degrees …
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Crab Cavity Requirements for the Jefferson Lab Electron-Ion Collider
… stable model to study effects of crab cavity multipoles and RF noise. We also study the role of crab cavity higher-order modes (HOM) in driving coupled-bunch instability and identify dangerous HOM which need to be damped. A specific crab cavity for JLEIC has not yet been selected. It is the …
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Gravitational Waves From Perturbed Kerr Black Holes: Two Investigations
… a. Independently of a, the inclusion of angular multipoles up to and including ℓ = 5 in the numerical flux is necessary to achieve the level of accuracy of the best-known (v8) expansion of the energy flux. In the second project we study the excitation of Kerr black holes produced by infalling …
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Response of periodic systems to electromagnetic fields: multipole expansion, microscopic charge-current density, polarization and magnetization
… character, with significant contributions from multipoles that would be negligible if the sphere was isolated. I link the SLRs to an excitation of the normal modes of the array, and propose a simplified model of the normal mode dispersion relations to explain the SLR properties. In the second …
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GALAXY-HALO CONNECTION AND CLUSTERING IN THE PRESENCE OF DYNAMICAL DARK ENERGY AND MASSIVE NEUTRINOS
… function both in real and redshift space and the multipoles of the power spectrum in redshift space. Also, from these measurements she has measured the bias of the produced mock galaxy and galaxy cluster catalogues and estimated how it changes in different massive neutrinos and dynamical dark …
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Differential cross sections for the reaction He[superscript 3] ([gamma],[rho]) H[superscript 2] from 45 to 150 MeV
… calculation which includes effects of all multipoles of electric interaction. It was not possible to fit the total cross section with the expression derived for electric dipole transitions with the Gunn and Irving wave function for the ground state of He3 for any reasonable value of the …
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Quantum Physics of Photosynthetic Light -Harvesting
… has been determined for all orders of multipoles (Coulomb mechanism) and includes the electron exchange (Dexter mechanism) term. We identified the mechanisms and pathways of singlet excitation transfer between carotenoids and chlorophylls. The role of the symmetry breaking in achieving …
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Quantum physics of photosynthetic light-harvesting
… has been determined for all orders of multipoles (Coulomb mechanism) and includes the electron exchange (Dexter mechanism) term. We identified the mechanisms and pathways of singlet excitation transfer between carotenoids and chlorophylls. The role of the symmetry breaking in achieving …
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