Timing observations from Rossi X-ray Timing Explorer (RXTE)

Beklen, Elif
In this thesis, RXTE observations of 4U 1907+09 are presented. Timing analysis of these data sets have yielded quasi periodic oscillations (QPOs) at orbital phases corresponding to the two flares in every orbital period. Known continuous spin down trend and QPO behaviour at the flares strongly suggest that a transient accretion disk occurs at the flares. Our findings strongly suggested that neutron star passes through the equatorial wind of Be companion star. During these passages a transient disk forms around Be neutron star.


Conjunction saves multiple sluicing: How *(and) why?
Citko, Barbara; Gracanın Yüksek, Martına (Ubiquity Press, Ltd., 2020)
Our goal in this paper is to analyze coordinated wh-sluicing in English and compare its properties to the properties of multiple sluicing, coordinated wh-questions and coordinated clefts. We show that none of these constructions has the properties of coordinated sluices, and conclude that coordinated sluices are not derivationally related to them. We propose, instead, that coordinated sluices underlyingly involve coordination of two interrogative CPs with a single fronted wh-phrase and an elided TP in ea...
Uncertainty quantification of parameters in local volatility model via frequentist, bayesian and stochastic galerkin methods
Animoku, Abdulwahab; Uğur, Ömür; Department of Financial Mathematics (2018)
In this thesis, we investigate and implement advanced methods to quantify uncertain parameter(s) in Dupire local volatility equation. The advanced methods investigated are Bayesian and stochastic Galerkin methods. These advanced techniques implore different ideas in estimating the unknown parameters in PDEs. The Bayesian approach assumes the parameter is a random variable to be sampled from its posterior distribution. The posterior distribution of the parameter is constructed via “Bayes theorem of inverse p...
Examination of Computer Supported Collaborative Business Process Modeling with Activity Theory
FINDIK COŞKUNÇAY, DUYGU; Çakır, Murat Perit (2014-09-10)
Activity Theory provides a framework to examine and explain human-human and human-computer interactions. In this study, Activity Theory was used to examine both interactions in depth in the context of Computer Supported Collaborative Business Process Modeling (CSCBPM) in which geographically dispersed multiple users interact with each other and with the system. This framework enabled us to examine the activities of CSCBPM in detail and understand the process of CSCBPM. During the CSCBPM, some difficulties w...
Machine Learning and Rule-based Approaches to Assertion Classification
Uzuner, Oezlem; Zhang, Xiaoran; Sibanda, Tawanda (Oxford University Press (OUP), 2009-01-01)
Objectives: The authors study two approaches to assertion classification. One of these approaches, Extended NegEx (ENegEx), extends the rule-based NegEx algorithm to cover alter-association assertions; the other, Statistical Assertion Classifier (StAC), presents a machine learning solution to assertion classification.
Exploring Pre-Service Science Teacher Expectations on Learning Science
YALÇIN ÇELİK, AYŞE; BEKTAŞ, Oktay; Demirci-Celep, Nilgun; KIRBULUT, ZÜBEYDE DEMET; Cetin-Dindar, Ayla; Geban, Ömer (2014-10-01)
The purpose of this study was to examine the expectations of the
Citation Formats
E. Beklen, “Timing observations from Rossi X-ray Timing Explorer (RXTE),” M.S. - Master of Science, Middle East Technical University, 2004.