The present study quantified surface doses on several rectangular phantom setups and on curved surface phantoms for a 6 MV photon field using the Attix parallel-plate chamber and Gafchromic EBT2 film. For the rectangular phantom setups, the surface doses on a homogenous water equivalent phantom and a water equivalent phantom with 60 mm thick lung equivalent material were measured. The measureme...

One of the main components in a Calypso 4D localization and tracking system is an electromagnetic array placed above patients that is used for target monitoring during radiation treatment. The beam attenuation and beam spoiling properties of the Calypso electromagnetic array at various beam angles were investigated. Measurements were performed on a Varian Clinac iX linear accelerator with 6 MV ...

A numerical simulation of the gas-dynamic processes in thrust vectorable nozzle solid rocket motor is considered. Construction a geometric model and generation computational mesh, reconstruction mesh at each time step are discussed. Calculations flowfield combustion products pre-nozzle chamber block carried out for various angles rotation. The distributions gas dynamic quantities volume corresp...

Biomass briquette stove is a cooking tool that still widely used by the people of interior South Sulawesi. Even in urban areas, it not uncommon to find their use because ease obtaining briquettes and its relatively good efficiency. This study aims determine best performance biomass from three types clay material shapes different configurations geothermal variations. The variations geometric sha...

In this study, a test technique that enables continuous control of the sample stress state from freezing to testing is proposed investigate influence pressure on mechanical properties ice under uniaxial compression. method, water frozen into standard cylindrical specimen high hydraulic in triaxial chamber, and then, temperature field specimens are adjusted initial test; finally, an situ conduct...

Many mobility studies (IMS) of electrospray ions with charge states z reduced to unity have shown a singular ability to analyze large protein complexes and viruses, though with wide mobility peaks (fwhm ∼ 20%). Here we confirm that this limitation arises primarily when early charge reduction precedes drop evaporation (suppressing secondary atomization by the usual sequence of many Coulomb explo...

Abstract Numerical simulation of continuously rotating detonations stoichiometric two-fuel mixture with air has been carried out for the cylindrical annular detonation chamber (DC) rocket-type engine. The syngas (1-α)СO+αH2, a binary hydrogen H 2 and carbon monoxide CO, is taken. We studied global flow structure in DC, detailed transverse wave (TW) front continuous regime. Integral characterist...

Dynamic media such as atmospheric clouds and fog form a formidable barrier to light propagation for free-space optical communication (FSO). To overcome an obstacle, we propose make use of the acoustic properties laser filament coupled together with donut-shaped signal beam. A generated by ultrafast is accompanied wave that clears cylindrical chamber around filament’s plasma column can mimic tra...

The purpose of this study was to determine the dosimetric impact of density variations observed in water-equivalent solid slabs. Measurements were performed using two 30 cm × 30 cm water-equivalent slabs, one being 4 cm think and the other 5 cm thick. The location and extent of density variations were determined by computed tomography (CT) scans. Additional imaging measurements were made with a...

Transverse thermoacoustic modes may occur in gas turbines, aero-engines, and rocket engines. Various scenarios of flame excitation can be observed, depending on the type transverse mode location relative to shape. If an acoustically compact, symmetric is exposed velocity fluctuations uniform strength direction, resulting modulation overall heat release rate invariant direction perturbation. It ...