Modern graphics processing units (GPUs) are inexpensive commodity hardware that offer Tflop/s theoretical computing capacity. GPUs are well suited to many compute-intensive tasks including digital signal processing. We describe the implementation and performance of a GPU-based digital correlator for radio astronomy. The correlator is implemented using the NVIDIA CUDA development environment. We...

The strange quark mass is determined from a study of the correlator 〈0|T (

The evidence and the theoretical justification of chiral symmetry restoration in high-lying hadrons is presented. I. CHIRAL SYMMETRY RESTORATION OF THE SECOND KIND It has recently been suggested that the parity doublet structure seen in the spectrum of highly excited baryons may be due to effective chiral symmetry restoration for these states [1]. This phenomenon can be understood in very gener...

Owing to the Japanese government plan, U-Japan, which promised to bring about the socalled ‘ubiquitous society’ by 2010, the use of Internet has dramatically increased and accordingly, development of the system through IT networks is thriving. The term ‘ubiquitous society’ became a buzzword, signifying easy access to content on the internet for anybody, anywhere and at any time. Face recognitio...

The forms of the neutral, non-strange pseudoscalar propagator matrix and mixed axial current correlator, 〈0|T (AμAν)|0〉, are discussed at next-toleading (one-loop) order in chiral perturbation theory, and the results compared to those obtained using QCD sum rules. This comparison provides a check of the truncations employed in the sum rule treatment of the current correlator. Values for the slo...