Geophysics and Sensor Technology

We present and interpret Global Positioning System (GPS) measurements of crustal motions for the period 1988-1997 at 189 sites extending east-west from the Caucasus mountains to the Adriatic Sea and north-south from the southern edge of the Eurasian plate to the northern edge of the African plate. Sites on the norther…

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• HAKAN YAZICI

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• RAHMİ GÜÇLÜ

We reanalyze the available X-ray spectral data of the type I bursting neutron star transients Aql X-1, Cen X-4, and 4U 1608-522 using realistic hydrogen atmosphere models. Previous spectral fits assumed a blackbody spectrum; because the free-free-dominated photospheric opacity decreases with increasing frequency, blac…

This paper presents the architecture and experimental verification of the automatic mode-matching system that uses the phase relationship between the residual quadrature and drive signals in a gyroscope to achieve and maintain matched resonance mode frequencies. The system also allows adjusting the system bandwidth wi…

• TAYFUN AKIN

We use a full‐wave finite element approach inspired by the mode calculation method of Wait (1970) to calculate electromagnetic fields in a horizontally stratified ionosphere treated as a magnetized plasma. The source currents can have arbitrary vertical and horizontal distributions. The electromagnetic field is calcul…

• UMRAN SAVAŞ İNAN

A set of kinematical and intrinsic equilibrium equations are derived for plates undergoing large deflection and rotation but with small strain. The large rotation is handled by means of the general finite rotation of a frame in which the material points that are originally along a normal line in the undeformedplate un…

• ALİ RANA ATILGAN

This paper presents a control scheme for distributed gyroscopic systems based on modal synthesis. The control parameters for each controlled mode are chosen independently of those for any other mode, thus resulting in a diagonal gain matrix for the controlled modes. The modal control laws are implemented by means of a…

Monitoring the response of engineering structures, such as tall buildings, tower and large-scale bridges, under severe loading conditions, such as strong earthquake or wind storm, is an important requirement to verify their design and construction and to evaluate structural condition and reliability. In the last two d…

• CEMAL ÖZER YİĞİT

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• AYDIN DOĞAN

We present the results of a Mössbauer experiment in a rotating system, whose performance was stimulated by our recent findings (2008 Phys. Scr . 77 035302) and which consisted of the fact that a correct processing of Kündig's experimental data on the subject gives an appreciable deviation of a relative energy shift Δ…

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• AYFER ERKEN