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Full-Text Articles in Physical Sciences and Mathematics
A Physically-Based Type Ii Supernova Feedback Model In Sph Simulations, Keita Todoroki
A Physically-Based Type Ii Supernova Feedback Model In Sph Simulations, Keita Todoroki
UNLV Theses, Dissertations, Professional Papers, and Capstones
We implement and test a core-collapse Type II SN feedback that is physically motivated and produces good agreement with observations in galaxy formation simulations. The model includes both kinetic and thermal feedback, allowing wind particles to receive a velocity kick that mimics galactic winds and distributes mass and metallicity to the interstellar and intergalactic medium. We also include a phenomenological stellar feedback to study a possible enhancement of the efficiency of the SN-II feedback by creating lower-density ambient gas medium of the stellar populations by distribution of thermal energy. Our SN-II model is unique in the sense that it computes …
Mathematical Equations And System Identification Models For A Portable Pneumatic Bladder System Designed To Reduce Human Exposure To Whole Body Shock And Vibration, Ezzat Aziz Ayyad
UNLV Theses, Dissertations, Professional Papers, and Capstones
A mathematical representation is sought to model the behavior of a portable pneumatic foam bladder designed to mitigate the effects of human exposure to shock and whole body random vibration. Fluid Dynamics principles are used to derive the analytic differential equations used for the physical equations Model. Additionally, combination of Wiener and Hammerstein block oriented representation techniques have been selected to create system identification (SID) block oriented models. A number of algorithms have been iterated to obtain numerical solutions for the system of equations which was found to be coupled and non-linear, with no analytic closed form solution. The purpose …
Discontinuous Galerkin Finite Element Methods For Maxwell's Equations In Dispersive And Metamaterials Media, Jiajia Waters
Discontinuous Galerkin Finite Element Methods For Maxwell's Equations In Dispersive And Metamaterials Media, Jiajia Waters
UNLV Theses, Dissertations, Professional Papers, and Capstones
Discontinuous Galerkin Finite Element Method (DG-FEM) has been further developed in this dissertation. We give a complete proof of stability and error estimate for the DG-FEM combined with Runge Kutta which is commonly used in different fields. The proved error estimate matches those numerical results seen in technical papers. Numerical simulations of metamaterials play a very important role in the design of invisibility cloak, and sub-wavelength imaging. We propose a leap-frog discontinuous Galerkin Finite Element Method to solve the time-dependent Maxwell's equations in metamaterials. The stability and error estimate are proved for this scheme. The proposed algorithm is implemented and …