Since its founding, NASA has been dedicated to the advancement of aeronautics and space science. The NASA Scientific and Technical Information (STI) Program Office plays a key part in helping NASA maintain this important role. The NASA STI Program Office is operated by Langley Research Center, the lead center for NASA's scientific and technical information. The NASA STI Program Office provides ...

PURPOSE To accelerate dose calculation to interactive rates using highly parallel graphics processing units (GPUs). METHODS The authors have extended their prior work in GPU-accelerated superposition/ convolution with a modern dual-source model and have enhanced performance. The primary source algorithm supports both focused leaf ends and asymmetric rounded leaf ends. The extra-focal algorith...

This paper deals with the kinetics of the color properties of hinoki (Chamaecyparis obtusa Endl.) wood. Specimens cut from the wood were heated at 90-180°C as accelerated aging treatment. The specimens completely dried and heated in the presence of oxygen allowed us to evaluate the effects of thermal oxidation on wood color change. Color properties measured by a spectrophotometer showed similar...

The principles of superposition and separation variables are used here in order to investigate the analytical solutions a certain transient heat conduction equation. structure temperature appropriations heat-transfer distributions summed up for straight mix results by means Fourier-Bessel arrangement exponential type investigated partial differential