Mathematical modelling and computer simulation of internal friction spectrum associated with interaction between dislocations and foreign interstitial atoms.

Güngör, Mehmet Rauf


Mathematical modelling of decoration peak associated with dragging point defects situated selectively at the kink chain with special references to hydrogenated BCC and FCC metals
Ogurtani, TO (1997-01-01)
The set of nonlinear differential equations that describes the kink chain oscillating in an atmosphere of continuously distributed paraelastic or isotropic point defects and, in addition, decorated by a dragging point defect at the midpoint, is solved numerically after introducing a novel scaling and renormalization procedure. The internal friction coefficient obtained indicates the existence of two separate peaks, the decoration peak and the parent peak, which are directly related to the localized point de...
Investigation of focusing parametric source in ultrasound hyperthermia.
Özyar, M. Serhat; Tosun, Haluk; Köymen, Hayrettin; Department of Electrical and Electronics Engineering (1996)
Investigation of fluid rheology effects on ultrasound propagation
Özkök, Ozan; Uludağ, Yusuf; Department of Chemical Engineering (2012)
In this study, a mathematical model is developed for investigating the discrete sound propagation in viscoelastic medium to identify its viscoelastic properties. The outcome of the model suggests that pulse repetition frequency is a very important parameter for the determination of relaxation time. Adjusting the order of magnitude of the pulse repetition frequency, the corresponding relaxation time which has similar magnitude with pulse repetition frequency is filtered while the others in the spectrum are d...
Social political discourse of the surveillance society
Yumurtacı, Egemen Nilüfer; Okyayuz, Mehmet; Department of Science and Technology Policy Studies (2003)
This thesis aims to discuss the Surveillance Society discourse, especially in relation with political analysis in a historical framework by means of new technologies. This study also analyzes the use of so-called revolutionary information and telecommunication technologies for data recording and tracking is analyzed, which is used to regulate the order of the system by the power holders. The limits of thought are traced to Foucault and Lyon. To this context an attempt is made to show that surveillance/ moni...
Transparency improvement in haptic devices with a torque compensator using motor current
Baser, Ozgur; Konukseven, Erhan İlhan; Gurocak, Hakan (2012-12-01)
Transparency of a haptic interface can be improved by minimizing the effects of inertia and friction through the use of model based compensators. However, the performance with these algorithms is limited due to the estimation errors in the system model and in the velocity and acceleration from quantized encoder data. This paper contributes a new torque compensator based on motor current to improve transparency. The proposed method was tested experimentally in time and frequency domains by means of an excita...
Citation Formats
M. R. Güngör, “Mathematical modelling and computer simulation of internal friction spectrum associated with interaction between dislocations and foreign interstitial atoms.,” Ph.D. - Doctoral Program, Middle East Technical University, 1996.