The unshielded twisted pair can be used as a transmission media for local distribution networks. To maintain a high transmission throughput, an analog or a digital adaptive channel equalizer is usually required in the receiver to minimize the effect of inter-symbol interference. Under the observation that the high sampling rate high precision A/D and subsequent digital adaptive signal processin...

Diesel exhaust emission is a major health concern because of the complex nature of its gaseous content (e.g., NO2, NO, CO, and CO2) and high concentration of particulate matter (PM) less than 2.5  μ m which allows for deeper penetration into the human pulmonary system upon inhalation. The aim of this research was to elucidate the potential toxic effects of diesel exhaust on a human pulmonary-ba...

A method for retrospective correction of intensity inhomogeneities induced by the heel effect in digital radiographs is presented. The method is based on a theoretical model for the heel effect which is derived from the acquisition geometry. Because the heel effect is directly measurable in the direct exposure area only, the image is partitioned first to exclude collimation and diagnostic areas...

  Background : Farmers and welders who work in open spaces and are exposed to direct sunlight are often exposed to sunlight radiation o n the neck and head . Thus, they may be afflicted with various types of skin cancer . The aim of the present study was to investigate the amount of UV exposure in welders working in Shahrud City , Iran .   Materials and Method s : This cross-sectio...

background: jaw bone quality plays an essential role in treatment planning and prognosis of dental implants. regarding several available methods for bone density measurements, they are not routinely used before implant surgery due to hard accessibility. objective: an in vitro investigation of correlation between average gray scale in direct digital radiographs and hounsfield units in ct-scan pr...

In this work we present a method for the direct determination of contaminant fallout rates on material surfaces from exposure to dust. Naturally occurring radionuclides 40K, 232Th, 238U and stable Pb were investigated. Until now, background contributions dust particulate have largely been estimated models assumed composition. Our utilizes variety low collection media in locations interest, foll...