Introduction Evaluation of the delivered dose of externally wedged photon beams by external diode dosimeters during the treatment process requires the estimation of exit surface dose correction factors in various wedge angles and field sizes. Materials and Methods A system of absorbed dose evaluation, using p-type diode dosimeters placed on the exit surface of a phantom, was characterized for e...

The amount of information available about urban traffic from aerial video imagery is extremely high. Here we discuss the collection of such video imagery from a helicopter platform with a low-cost sensor, and the post-processing used to correct radial distortion in the data and register it. The radial distortion correction is accomplished using a Harris model. The registration is implemented in...

Background: Small photon fields are increasingly used in modern radiotherapy especially in intensity modulated radiation therapy (IMRT) and stereotactic radiosurgery (SRS) treatments. Accurate beam profile and central axis depth doses measurements of such beams are complicated due to the electron disequilibrium. Hence the EBT2 (external beam therapy) Gafchromic film was used for dosimetry of sm...

Electromagnetic position tracking devices are an integral part of many modern virtual reality systems. However, they have an inherent accuracy problem due to the dependence on the local electromagnetic field that can be easily distorted by a presence of magnetically active elements near the tracker’s transmitter or receiver. Several analytical techniques have been proposed to overcome this limi...

This documents lists some errors found in the second edition of Error Control Coding by Shu Lin and Daniel J. Costello.

abstract oculocardiac reflex (ocr) sometimes occurs as a result of pressure on the eye or traction of the intraorbital surrounding structures during ophthalmic surgery. this can result in bradycardiac arrhythmia and cardiac arrest. a 45-year-old female was undergoing an elective squint correction surgery of one eye under local anaesthesia in a private hospital in december 2013. the patient was ...

In moderately coupled Yukawa fluids, longitudinal mode dispersion is determined by the competition between kinetic and potential effects. a recent paper [S. Khrapak L. Couëdel, Phys. Rev. E 102, 033207 (2020)], semi-phenomenological relation was constructed ad hoc addition of Bohm–Gross term to generalized instantaneous excess bulk modulus, which showed very good agreement with simulations. thi...

probability of this quantum receiver did not fall below 10–4 is due to experimental limitations; in particular, the visibility of the interferometer at the beamsplitter used in the displacement operation and the detection efficiency of the singlephoton detector were major sources of imperfection. Imperfect visibility causes errors in photon counts even when a correct displacement operation is c...