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Articles 1  6 of 6
FullText Articles in Physics
Density Functional Calculations On Single Molecular (1d) And Van Der Waals Bi Layered (2d) Magnets., Md Shamsul Alam
Density Functional Calculations On Single Molecular (1d) And Van Der Waals Bi Layered (2d) Magnets., Md Shamsul Alam
Open Access Theses & Dissertations
Lowdimensional magnetic materials show novel properties that is not seen in bulk magnets. The weak interactions such as spinorbit interactions, electron correlation, van der Waals interaction in case magnetic bilayers, play an important role in determining the properties of the system. Using density functional theory, we computationally investigated two categories of magnetic material 1: Single Molecular Magnets (SMM) 2: Van der Waals layered CrHalide magnets. We used different classes of density functionals to examine the spin ordering and magnetic anisotropy barriers in several single molecule magnets  Mn12, Co4, Ni4, V15. We find that the magnetic anisotropy barrier significantly depends on ...
Some FermiLowdin Orbital SelfInteraction Correction Studies On Atomic Systems, Christopher Alexis Ibarra
Some FermiLowdin Orbital SelfInteraction Correction Studies On Atomic Systems, Christopher Alexis Ibarra
Open Access Theses & Dissertations
Density Function Theory (DFT) is a popular quantum chemistry calculation method with many appeals but also deficiencies. Many modification and additions to the method have been made over the years, such as selfinteraction corrections and new density functional approximations. We review here the theoretical background needed for a basic understanding of quantum chemistry calculations. In addition, we present the quantum chemistry calculation method used in this paper called FermiLowdin SelfInteraction Correction (FLOSIC), including the base code it was implemented on, the Naval Research Laboratory Molecular Orbital Library (NRLMOL) Code, and the resulting modified code simply called FLOSIC. Furthermore, we explore ...
Development And Assesment Of Local Scaled SelfInteraction Corrected Density Functional Method With Simple Scaling Factor, Selim Romero
Development And Assesment Of Local Scaled SelfInteraction Corrected Density Functional Method With Simple Scaling Factor, Selim Romero
Open Access Theses & Dissertations
The HohenbergKohnSham (HKS) density functional theory (DFT) is widely used to compute electronic structures of atoms, molecules, and solids. It is an exact theory in which ground state electron density plays the role of basic variable, same as the wavefunction does in quantum mechanics. The total ground state energy is a functional of electron density. The practical application of HKS DFT require approximation to the exchangecorrelation energy functional. Many density functional approximations (DFAs) with various degree of sophistication and complexities have been developed. Depending on the complexity, these functionals include electron density, density gradients, density Laplacian, kinetic energy densities, HartreeFock ...
Scalability Improvements To Nrlmol For Dft Calculations Of Large Molecules, Carlos Manuel Diaz
Scalability Improvements To Nrlmol For Dft Calculations Of Large Molecules, Carlos Manuel Diaz
Open Access Theses & Dissertations
Advances in high performance computing (HPC) have provided a way to treat large, computationally demanding tasks using thousands of processors. With the development of more powerful HPC architectures, the need to create efficient and scalable code has grown more important. Electronic structure calculations are valuable in understanding experimental observations and are routinely used for new materials predictions. For the electronic structure calculations, the memory and computation time are proportional to the number of atoms. Memory requirements for these calculations scale as N2, where N is the number of atoms. While the recent advances in HPC offer platforms with large numbers ...
Complex Gleason Measures And The Nemytsky Operator, Miguel Angel Valles
Complex Gleason Measures And The Nemytsky Operator, Miguel Angel Valles
Open Access Theses & Dissertations
This Thesis is devoted to generalize previous results on Gleason measures
to complex Gleason measures, and to develop a functional calculus
for complex measures in relation to the Nemytsky operator. Furthermore
we present the interpretation of our results in the field of quantum
mechanics, some concrete examples and further extensions of several
theorems.
On Relational Quantum Mechanics, Oscar Acosta
On Relational Quantum Mechanics, Oscar Acosta
Open Access Theses & Dissertations
A problem facing quantum mechanics is that there are a number of views or interpretations available that purport to 'explain' quantum mechanics. In this paper I discuss and analyze the view of relational quantum mechanics by Carlo Rovelli in the context of theoretical underdetermination. I will show that even though Rovelli offers a view that consolidates some of the aspects of competing theories it still falls short of breaking out of the theoretical underdetermination. The criteria that I have used to consider a theory successful in this context is one that increases the predictive output of quantum theory. Lacking an ...