The red noise power density estimation techniques and application to the source sax j2103.5+4545

Erkoca, Arif Emre
In this thesis,red noise analysis techniques are presented. The necessity of the use of the window functions and the Deeter polynomial method in order to determine red noise is discussed. The method was applied to the source SAX J2103.5+4545 which showed a white torque noise with a relatively low noise strength due to its being a transient system.


Ellipsometric and uv-vis transmittance analysis of amorphous silicon carbide thin films
Gülses, Ali Alkan; Katırcıoğlu, Bayram; Department of Physics (2004)
The fundamentals of the ellipsometry are reviewed in order to point out the strengths and weaknesses of the ellipsometric measurements. The effects of the surface conditions (such as degree of cleanliness, contaminated thin layer, roughness etc_) on the ellipsometric variables are experimentally studied; the optimum procedures have been determined. Hydrogenated amorphous silicon carbide (a-Si1-xCx:H) thin films are produced by plasma enhanced chemical vapor deposition (PECVD) technique with a circular react...
A continuum model for decoherence in 1D transport
Şenozan, Selma; Turgut, Sadi; Department of Physics (2005)
In this thesis we study the conductance of a one dimensional conductor in the presence of dephasing. Dephasing effects are modelled after generalizing Büttiker̕s dephasing model (Phys. Rev. B 33, 3020 (1986)) to a continuous one. Infinitely many electron reservoirs are coupled to the conductor as phase breakers and the method for calculating the conductance is presented. We investigate how this continuum decoherence effect the conductance of a wire, with single and double rectangular barriers.
Development of software for calculations of the reflectance, transmittance and absorptance of multilayered thin films
Şimşek, Yusuf; Esendemir, Akif; Department of Physics (2008)
The aim of this study is to develop a software which calculates reflection, transmission and absorption of multilayered thin films by using complex indices of refraction, as a function of both wavelength and thickness. For these calculations matrix methods will be considered and this software is programmed with the matrix method. Outputs of the program will be compared with the theoretical and experimental results studied in the scientific papers.
Entanglement in the relativistic quantum mechanics
Yakaboylu, Enderalp; İpekoğlu, Yusuf; Department of Physics (2010)
In this thesis, entanglement under fully relativistic settings are discussed. The thesis starts with a brief review of the relativistic quantum mechanics. In order to describe the effects of Lorentz transformations on the entangled states, quantum mechanics and special relativity are merged by construction of the unitary irreducible representations of Poincaré group on the infinite dimensional Hilbert space of state vectors. In this framework, the issue of finding the unitary irreducible representations of ...
Kaluza-klein reduction of higher curvature gravity models
Kuyrukcu, Halil; Başkal, Sibel; Department of Physics (2010)
The standard Kaluza-Klein theory is reviewed and its basic equations are rewritten in an anholonomic basis. A five dimensional Yang-Mills type quadratic and cubic curvature gravity model is introduced. By employing the Palatini variational principle, the field equations and the stress-energy tensors of these models are presented. Unification of gravity with electromagnetism is achieved through the Kaluza-Klein reduction mechanism. Reduced curvature invariants,field equations and stress-energy tensors in fou...
Citation Formats
A. E. Erkoca, “The red noise power density estimation techniques and application to the source sax j2103.5+4545,” M.S. - Master of Science, Middle East Technical University, 2004.