We report on numerical and theoretical investigation of subauroral arcs within strong ion drifts (SAID)--STEVE Picket Fence. Their explanation requires the specific suprathermal electron distribution excitation vibrational electronic states neutral species. show that ionospheric feedback in SAID with low-density troughs or without a so-called valley generates intense, small-scale field-aligned ...

INTRODUCTION Results of use of methodology for VMAT commissioning and quality assurance, utilizing both control point tests and dosimetric measurements are presented. METHODS AND MATERIALS A generalizable, phantom measurement approach is used to characterize the accuracy of the measurement system. Correction for angular response of the measurement system and inclusion of couch structures are ...

Interest in pursuit eye movements has recently been revived by observations that show the adequate stimulus for visual pursuit to be more complex than was previously thought. Pursuit can be maintained without a continuously present stimulus, and even target movement is unnecessary under some conditions. The first modem demonstration of such effects was Stoper’s (1967) “picket-fence illusion”, w...

The solid-gas 02 binding equilibrium has been studied for ferrous "picketfence" porphyrinates with sterically hindered axial imicazoles. Such systems show significant cooperativity in their binding of 02: at low 02 pressures a low 02 affinifo exists, and at high 02 pressures a higher 02 affinity form develops. Direct analogies are drawn to the cooperativity shown in Oi binding by hemoglobin. Th...

The time dependence of atropisomer interconversion has limited the pursuit single drug candidates, even in circumstances where one presents favorable biological activity over another. Moderate energy barriers risk compromising stability. As a result, examples atropisomerically pure drugs current clinical use are rare. However, recent years, there been shift towards development single, stable ca...

AIM In this study, the dosimetric properties of the electronic portal imaging device were examined and the quality assurance testing of Volumetric Modulated Arc Therapy was performed. BACKGROUND RapidArc involves the variable dose rate, leaf speed and the gantry rotation. The imager was studied for the effects like dose, dose rate, field size, leaf speed and sag during gantry rotation. MATE...