A Psychoacoustic Quality Criterion for Path-Traced Sound Propagation.

In developing virtual acoustic environments, it is important to understand the relationship between the computation cost and the perceptual significance of the resultant numerical error. In this article, we propose a quality criterion that evaluates the error significance of path-tracing-based sound propagation simulators. We present an analytical formula that estimates the error signal power spectrum.

A Case of Cystic Intrahepatic Cholangiocarcinoma Mimicking a Cyst.

Intrahepatic cholangiocarcinoma (ICC) classically presents as irregular soft tissue lesions. Very rarely, ICC may manifest as a predominantly cystic mass. Here, we describe a 59-year-old man who was referred to the hospital due to abdominal pain.

Microstructure and Tensile Properties of Graphene-Oxide-Reinforced High-Temperature Titanium-Alloy-Matrix Composites.

In this study, graphene-oxide (GO)-reinforced Ti-Al-Sn-Zr-Mo-Nb-Si high-temperature titanium-alloy-matrix composites were fabricated by powder metallurgy. The mixed powders with well-dispersed GO sheets were obtained by temperature-controlled solution mixing, in which GO sheets adsorb on the surface of titanium alloy particles. Vacuum deoxygenating was applied to remove the oxygen-containing groups in GO, in order to reduce the introduction of oxygen.