nowadays, by complication of production mechanisms from reservoirs and depletion of most of the reservoirs in iran, secondary production has become more important. regarding the nature of iranian reservoirs and carbonate inherencies and diagenetic and tectonic effects on these reservoirs, we see heterogeneities in them which cause uncertainty in predictions and performance of these reservoirs. ...

Abstract The paper is devoted to the problem of fatigue failure two-phase titanium alloy VT3-1 under action high-frequency cyclic loading. Samples for tests were made from compressor disk aviation engine D30-Ku installed on Tupolev Tu-154 planes. Repeated alternating loading was carried out by displacements small amplitude at 20 kHz, coinciding with first harmonic longitudinal elastic vibration...

BACKGROUND/AIM Midface fractures are commonly present and difficult to diagnose in trauma patients. The objective of this study was to determine clinically accessible indicators of midface fracture. MATERIAL AND METHODS A case-control study design was used to determine clinical indicators of midface fracture. Population source was a level I trauma center registry for years 2007-2009. Cases ha...

Postoperative periprosthetic femoral fractures around the stem of a total hip arthroplasty are increasing in frequency. To obtain optimal results, full appreciation of the clinical evaluation, classification, and modern management principles and techniques is required. Although periprosthetic femoral fracture associated with a loose stem requires complex revision arthroplasty, fractures associa...

OBJECTIVE The relationship between diabetes and fracture is not completely understood. This study evaluated fracture risk and postfracture mortality in patients with diabetes. RESEARCH DESIGN AND METHODS We identified 32,471 adults newly diagnosed with diabetes in 2000-2003 using Taiwan's National Health Insurance Research Database. A comparison cohort of 64,942 adults without diabetes was ra...

We have developed a low frequency theory for scattering from surface cracks. For the case of halfpenny shaped surface cracks, we are able to relate the reflection coefficient of a Rayleigh wave incident on the crack with the crack size as well as the fracture stress of a sample with the crack in it. Comparisons of the theoretical predictions for the fracture stress with the actual fracture stre...

We study experimentally the fracture dynamics during the peeling at a constant velocity of a roller adhesive tape mounted on a freely rotating pulley. Thanks to a high speed camera, we measure, in an intermediate range of peeling velocities, high frequency oscillations between phases of slow and rapid propagation of the peeling fracture. This so-called stick-slip regime is well known as the con...

Development of borehole geophysics has recently focused on reservoir characterization. Within this effort, extensive full waveform acoustic surveys have demonstrated a correlation between the occurance of open fractures and attenuation of Stoneley waves. A relationship is obtained here between fracture permeability and attenuation of Stoneley waves, on the basis of a physical mechanism. This me...

BACKGROUND/AIM Despite the importance of hip fractures, very few studies have assessed their epidemiological characteristics in Turkey. The aim of this study was to evaluate the frequency and demography of hip fractures from the recent data of a central training and research hospital. MATERIALS AND METHODS In this descriptive study, we identified hip fracture cases between 2009 and 2013. The ...