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 21 for “"R-matrix"”.
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Dirac R-matrix scattering calculations in support of plasma diagnostics
… are carried out using the relativistic Dirac R-matrix (DARC) and the semi-relativistic Breit-Pauli (BP) R-matrix codes. The results from these calculations, along with the atomic structure data, are incorporated into collisional-radiative model programs. These collisional-radiative models …
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R-matrix calculations in support of diagnostics for fusion and astrophysical plasmas
… make use of relativistic and semi-relativistic R-matrix scattering methods implemented by the parallel Breit-Pauli R-matrix and Dirac R-matrix codes. We then employ collisional-radiative models, exploiting results from both the atomic structure and R-matrix calculations, to provide us with …
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Calculation of Electron Collision Cross Sections in Fluorinated Nitrile (C4F7N) and its Dissociation Fragments
… sections, this report concerns the use of the R-matrix method solver Quantemol-EC. This software uses the sophisticated UKRmol+ codes to solve the electron-molecule scattering problem at low to moderate energies (0.01 - 20 eV) and produce elastic, vibrational, electronic excitation, and …
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Ultrafast Atomic Dynamics in Arbitrary Light Fields
… of arbitrary complexity.<br/><br/>An ab initio R-matrix with time-dependence (RMT) theory for ultrafast atomic processes in arbitrarily polarised laser fields is described. The theory is applicable to multielectron atoms and atomic ions subject to ultrashort laser pulses with any given …
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Integrability from Chern-Simons theories
… the boundary analogue of a quasi-classical $R$-matrix and classical $r$-matrix; realising $K$-matrices as the vacuum expectation values of Wilson lines in 4d Chern-Simons theory on a $\bbZ_2$ orbifold; deriving the order $\hbar$ contribution to a $K$-matrix in the rational case and verifying …
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Spinabhängige Asymmetriefunktionen in der elastischen und inelastischen Elektron-Cäsium-Streuung bei mittleren Energien
… which use either the relativistic R matrix method, or the convergent close-coupling method.
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SUSY Seesaw model and phenomenological implications for leptonic processes at low energies and leptogenesis
… probes of the unknown complex orthogonal R-matrix of the seesaw model.
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Development of Adaptive and Factorized Neural Models for MPC of Industrial Systems
… adaptation. In decomposing the regression matrix of the RBF model, the R matrix is obtained. Principles for adding centres and pruning centres are developed based on the manipulation of the R matrix. While the modelling accuracy is remained, the developed structure adaptation algorithm …
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A new unresolved resonance region methodology
… format to take advantage of the more robust R-Matrix Limited (RML) format. For each sampled set of resonance-pair sequences, the temperature-dependent cross sections are calculated on a small grid around the energy of reference using the RML formalism and the Leal-Hwang Doppler broadening …
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New degrees of freedom in integrable models with q-Hahn weights and their applications to symmetric functions and probability.
… that the q-Hahn orthogonality weights appear as matrix coefficients in certain isomorphisms between tensor products of representations of quantum affine sl₂ algebra. This allows us to find new integrable degrees of freedom in q-Hahn models by constructing an integrable vertex model on a square …
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Photoionization of Se Ions for the Determination of Elemental Abundances in Astrophysical Nebulae
… using fully relativistic Dirac Atomic R-matrix Code (DARC). These results are also used to improve the accuracy of the National Institute of Standards and Technology tabulated database of atomic structure. The results for each ion are additionally used to examine specific aspects of the …
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Nuclear Computations under Uncertainty New methods to infer and propagate nuclear data uncertainty across Monte Carlo simulations
… and their uncertainties (equivalent to R-matrix theory), whereby one can sample on-the-fly uncertain nuclear cross sections and analytically compute their thermal Doppler broadening. This drastically reduces the memory footprint of nuclear data (at least 1,000-fold), without incurring …
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Factors influencing porosity and permeability, Wilcox Group (Eocene), Karnes County, Texas
… with an average composition of Q₅₉ F₁₆ R₂₅; matrix values range from 0 to 46 percent and cement values range from 8 to 34 percent. Permeability values range from nil to over 650 millidarcies. Porosity values, also determined by gas injection, range from 6 to 36 percent and thin section …
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Using fusion-product spectroscopy to study inertial fusion implosions, stopping power, and astrophysical nucleosynthesis at OMEGA and the NIF
… reaction ³He+³He, are used to constrain the R-matrix nuclear theory. Finally, a cross section measurement for the reaction p+D -->³He+[gamma] has been performed; this reaction is relevant to energy generation in brown dwarfs, protostars, and to production of ³He during the Big Bang.
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Study of ¹⁸NE using the array for Nuclear Astrophysics and Structure with exotic nuclei
… cross sections using phenomenological R-matrix theory. We conclusively observe two resonances. One corresponds to a 1- state in 18Ne, and we determine Ex = 6142 (5)stat (8)sys keV with total width Γ = 45 (12) keV. We are also able to set a lower limit on the proton partial width to the …
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Multiparameter quantum groups: contractions and coloured generalisations.
… by giving a coloured generalisation of the R-matrix approach. The results obtained in the thesis are believed to be of significance in the further study of coloured quantum groups as well as in various mathematical and physical aspects of quantum groups.
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Caratteristiche morfometriche della popolazione sarda dal Neolitico al XIX secolo: craniometria e statura
… is based on multivariate techniques including R-Matrix analysis, principal coordinate analysis, discriminant functional analysis and cluster analysis. The results have showed a clear separation among Paleo-Meso-Neolithic populations and others more recent European populations. It has also noticed …
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The fine structure of translation functors, the triangle function and a construction of R-matrices
Let E be a simple finite-dimensional representation of a semisimple Lie algebra <br>with extremal weight <br>u and let e in E_{ <br>u} nonzero. <br>Let M( au) be the Verma module with highest weight au and v_{ au} the canonical <br>generator. <br>We investigate the projection of e otimes v_{ au} in …
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