fax 01-972-952-9435. AbstractFormation stresses and rock strength together with wellbore and pore pressures are important inputs to failure models whose predictions help in well planning, wellbore stability and production. A complete characterization of formation stresses requires estimation of the overburden, maximum and minimum horizontal stresses together with pore pressure as a function of depth. The overburden stress is reliably estimated by integrating with depth the formation bulk density, and pore pressure is directly measured in a permeable reservoir interval. The maximum and minimum horizontal stresses can be estimated from borehole sonic data in the presence of crossing dipole dispersions. A new stress magnitude estimation algorithm inverts radial variation of the three shear moduli together with the overburden stress and pore pressure at a given depth for the maximum and minimum horizontal stress magnitudes and formation nonlinear constants referred to a local reference state. The algorithm uses equations relating differences in the dipole shear moduli at two radial positions and corresponding differences in the principal stresses obtained from near-wellbore stress concentrations using the Kirsch's equations. Radial positions in the plastically yielded region close to the borehole surface are excluded from the inversion algorithm.Processing of sonic data yields crossing dipole dispersions in three sand intervals in a development well drilled in a high pressure (770 bars) gas condensate field operated by Statoil in the Norwegian continental shelf. Results for both the maximum and minimum horizontal stress magnitudes are consistent in the three sand intervals in the Bent reservoir of the Kvitebjorn field. Estimated minimum horizontal stress magnitude is in good agreement with the mini-frac test conducted at a nearby depth. The maximum horizontal stress direction coincides with the fast-shear azimuth obtained from the Alford rotation of cross-dipole waveforms. Horizontal stress magnitude results have helped in refining the mechanical earth model and in subsequent drilling of development wells in this field.

Despite all the current studies and uterine manipulators on the market, no research has incorporated all the features mentioned above.

In this study, a platform to develop remote control appliactions via bluetooth communication by using general purpose microcontroller boards and Adroid-based devices was designed. This system was designed to integrate easily into all kind of devices that was developed by students or manufacturers in especially biomedical area. In addition, it has an Android application. It is possible to transmit control statements wirelessly from a microcontroller board or an Android-based device to another microcontroller board via bluetooth. On the client-side board, there are PWM-driven led illumination control, servo motor control and four on-off relay controls. The implemented system is designed to use easily for educational purposes. Time saving from sofware design applications is aimed in this study.

Nowadays, DC engines have been widely used in daily life. Thanks to its popularity, students are expected to apply their theoretical control algorithms in a DC engine control as an application. Although these necessities and requirements, there is no presented experimental setup for both industrial and educational purposes. In this study, an experimental setup is developed in order to control two distinct DC engines via an embedded microcontroller board and engine driver circuits for testing intelligent system based control algorithms in PC. PID control algorithm is tested via the implemented setup.

Bu çalışma trakeal tüp ve laringeal maske için kaf basıncı ölçmeyi sağlayan taşınabilir medikal cihaz tasarımı ve gerçeklemesini sunar. Geliştirilen cihaz, ameliyathane ve yoğun bakımlarda kullanılan pilot balon içindeki hava basıncının izlenmesini sağlayan taşınabilir bir medikal cihazdır. Trakeal tüp veya laringeal maske içinde ölçülen kaf basınç değerleri cihaz üzerinde bulunan ekrana ve hafıza kartına eş zamanlı aktarılabilir. Kaf pilot balonu içindeki hava basıncı izin verilen basınç değerleri aralığının dışına çıktığında sesli uyarı verir. Geliştirilen cihaz mikro denetleyici tabanlı bir gömülü sistem kartı ve baro-metrik basınç-ölçer kullanılarak gerçekleştirilmiştir. Basınç ölçümleri in-vitro olarak bebek ve çocuk fantomlar üzerinde test edilmiş, alınan gerçek verilerle istatistik analizi yapılmıştır.