Browsing Bilkent Theses by Title
Now showing items 4110-4129 of 5526
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Rabi oscillations in an exciton-polariton system
(Bilkent University, 1995)The pure qiiaiitum model d(\scril)ing lîahi oscillations of exciton-polaritons in a ınicro-cavity is consid(‘r(‘(l. IMiolon-c'Xcilon intiT’action Hamiltonian is diagonalized with the aid of Bogoliihov canonical transformations ... -
Radar cross section (RCS) of perfectly conducting (PEC) thin wires and its application to radar countermeasure: Chaff
(Bilkent University, 2015)In electronic warfare, active and passive countermeasures are used to jam threat RF radars. While electronic jamming pods are accepted as an active one, chaff is accepted as a passive countermeasure that consists of ... -
Radiation fields of a complex source in 2-D circular radome with metal gratings
(Bilkent University, 1997)In this thesis, the transmission effect of a two-dimensional circular radome with periodic metal gratings is analyzed. We started with the study of gratings consisting of periodic arrays of thin lossy strips surrounded ... -
Radiation fields of the line source in a cylindrical wire grating
(Bilkent University, 1998)In this thesis, the transmission effect of a grid structure is analyzed. The grid structure is intended to model the metallic support elements of a radome. The total field for the real and complex position line sources ... -
Radiation impedance of capacitive micromachined ultrasonic transducers
(Bilkent University, 2010)Capacitive micromachined ultrasonic transducers (cMUTs) are used to transmit and receive ultrasonic signals. The device is constructed from circular membranes fabricated with surface micromachining technology. They have ... -
Radiation properties of sources inside photonic crystals
(Bilkent University, 2003)The control of spontaneous emission is an important problem both in basic and applied physics. Two main problems arise in the control of emission: enhancement or suppression and angular confinement of radiation. In this ... -
Radiochemical and spectroscopic studies of cesium, barium, and cobalt sorption on some natural clays
(Bilkent University, 2000) -
Radiochronology of sediments from various regions of the Mediterranean Sea by direct gamma spectroscopy using natural 210Pb, 226Ra and fallout 137Cs
(Bilkent University, 1992)The and profiles are determined at two locations in southern coast of Spain, Three locations in southern coast of Turkey and two locations in coast of Cyprus. Compaction-corrected sedimentation rates are derived for all ... -
Radius of curvature and location estimation of cylindrical objects with sonar using a multi-sensor configuration
(Bilkent University, 1997)Despite their limitations, sonar sensors are very popular in time-of-flight measuring systems since they are inexpensive and convenient. One of the most important limitations of sonar is its low angular resolution. An ... -
Raising EFL learners’ awareness of suprasegmental features as an aid to understanding implicatures
(Bilkent University, 2018-07)This study investigated the effects of raising EFL learners’ awareness of suprasegmental features as an aid to understanding implicatures. This quantitative method study was conducted with thirty-six EFL learners studying ... -
Ramanujan's congruences for the partition function
(Bilkent University, 2009)In this thesis, we study Ramanujan’s congruences for the partition function and some of their combinatorial interpretations. Our main tools are from the theory of theta function. -
Random access over wireless links: optimal rate and activity probability selection
(Bilkent University, 2017-07)Due to the rapidly increasing number of devices in wireless networks with the proliferation of applications based on new technologies such as machine to machine communications and Internet of Things, there is a growing ... -
Random codes and matrices
(Bilkent University, 2009)Results of our study are two fold. From the code theoretical point of view our study yields the expectations and the covariances of the coefficients of the weight enumerator of a random code. Particularly interesting is ... -
Random delay techniques for location privacy in VANETs
(Bilkent University, 2013)Vehicular ad hoc network (VANET) is an emerging new communication technology which has attracted a lot of research attention from academic community and industry. It is promising technology to provide safer and efficient ... -
Randomized convolutional and concatenated codes for the wiretap channel
(Bilkent University, 2016-11)Wireless networks are vulnerable to various kinds of attacks such as eavesdropping because of their open nature. As a result, security is one of the most important challenges that needs to be addressed for such networks. ... -
Range resolution improvement in passive bistatic radars using deconvolution
(Bilkent University, 2015-11)Passive radar (PR) systems attract interests in radar community due to its lower cost and power consumption over conventional radars. However, one of the main disadvantages of a PR system is its low range resolution. The ... -
Range resolution improvement in passive coherent location radar systems using multiple FM radio channels
(Bilkent University, 2007)Passive coherent location (PCL) radar systems that use single FM radio channel signal as illuminator of opportunity have reasonable Doppler resolution, but suffer from limited range resolution due to low modulation ... -
Ranking the performance of country funds using risk adjusted performance measures: Treynor Index, Sharpe Index, Jensen Index
(Bilkent University, 1990)T h i s s t u dy ranks the performaпсе o f c o u n t r y f u n d s w i t h i n th e international context using risk adjusted performance measures, namely Treynor Index, Sharpe Index, and ... -
Rape discourses in Turkey : the case of Turkish television series Fatmagül'ün Suçu Ne?
(Bilkent University, 2012)The television series Fatmagül’ün Suçu Ne?, which first aired in September 2010, turned in to a phenomenon. The rape scene in the first episode was anticipated for months and after it aired, scene was talked about for ... -
Rapid multi-contrast magnetic resonance imaging and time-of-flight angiography
(Bilkent University, 2019-02)Magnetic resonance imaging (MRI) is a frequently used imaging modality for examining soft tissue structures. Long scanning time is the most crucial constraint that limits the use of MRI in the clinics. Partial Fourier ...
