Essays about: "orbital approximation"

Showing result 1 - 5 of 14 essays containing the words orbital approximation.

1. 1. Classical Limits in Planetary Motion and Gravitational Radiation

   University essay from KTH/Skolan för teknikvetenskap (SCI)

   Author : Sebastian Gustasson; Emma Andersson; [2023]
   Keywords : general relativity; frame-dragging; gravitational radiation;

   Abstract : In this report, we analyze general relativistic effects on celestial bodies, including gravitational strength in different metrics, gravitational radiation, and frame-dragging. We present simulation methods for classical and general relativistic motion, through the use of systems of equations that may be numerically integrated. READ MORE

3. 2. Spectroscopic model characterisation of hot exoplanet atmospheres

   University essay from Lunds universitet/Astronomi - Genomgår omorganisation; Lunds universitet/Fysiska institutionen

   Author : Elin Sandvik; [2022]
   Keywords : Transit method; Transmission spectroscopy; Exoplanets; Hot Jupiter; Modelling; Physics and Astronomy;

   Abstract : Hot Jupiters are gas giants under intense stellar radiation with short orbital periods of only a few days. Due to their large radii, hot temperatures, and large scale heights, hot Jupiters can be observationally characterised in detail through spectroscopy over an entire orbital phase. READ MORE

4. 3. B-plane orbital resonance analysis and applications

   University essay from KTH/Rymdteknik

   Author : Alessandro Masat; [2020]
   Keywords : ;

   Abstract : Many space engineering and orbital mechanics applications seek for the usage of focused mathematical models, capable of providing useful insight onto particular phenomena or exploiting some theoretical and physical tools to reduce the computational costs and/or increase the level of accuracy reached. Orbital resonances are one of the phenomena that needs to be properly modelled, both for exploiting such features in the mission design phase and to predict possible resonant returns of threatening objects closely approaching a specified planet. READ MORE

5. 4. Everything you wanted to know about the TPA molecule adsorbed on Au(111)

   University essay from Uppsala universitet/Materialteori

   Author : Pamela H.W. Svensson; [2020]
   Keywords : Everything; you; wanted; to; know; about; TPA; molecule; adsrobed; on; Au; Au 111 ; Triphenylamin; Triphenylamine; DFT; Quantum; Espresso; QE; Generating; Pseudopotentials; NEXAFS; DOS; PDOS; simulations; organic; solar; cell; perovskite; HTM; HCH; NCH; FCH; PP; geometry; optimization;

   Abstract : The electronic properties of Triphenylamine (TPA) in gas phase and adsorbed on gold(111) have been simulated with Quantum Espresso using Density Functional Theory (DFT). To better understand how the presence of a gold surface affects sunlight absorption in the system, partial Density Of States (pDOS) and Near Edge X-ray Absorption Fine Structure (NEXAFS) of the system have been calculated. READ MORE

6. 5. Ensemble Green's Function Theory for Interacting Electrons with Degenerate Ground States

   University essay from Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

   Author : Erik Linnér; [2019]
   Keywords : Green s function; Degeneracy; Density matrix; Ensemble; GW; Zero-temperature; Finite-temperature; Hubbard model; Two-dimensional harmonic oscillator; Ising model; Hydrogen-like model; Physics and Astronomy;

   Abstract : An ensemble Green's function theory for many-electron systems with degenerate ground states, based on the von Neumann density matrix formalism, is proposed. The formalism is constructed without an assumption of an adiabatic connection. An ensemble analogue of Hedin's equations and the GW Approximation (GWA) is constructed. READ MORE