5 research outputs found
Developing of higher voltage direct-current power-feeding prototype system
High efficiency power feeding systems are effective solutions for reducing ICT power consumption of ICT equipment, such as routers and servers, or high efficiency cooling systems. We developed a higher voltage direct current (HVDC) power feeding system prototype. This system is composed of a rectifier, power distribution cabinet, batteries, and ICT equipment. The configuration is similar to a -48 V DC power supply system. The output of the rectifier is 100 kW, and the output voltage is 401.4 V. We describe the advantage of an HVDC power feeding system and show that its basic characteristics are stable.INTELEC 2009 - 2009 International Telecommunications Energy Conference : Incheon, South Korea, 2009.10.18-2009.10.2
UV/IR Mixing and Anomalies in Noncommutative Gauge Theories
Using path integral method (Fujikawa's method) we calculate anomalies in
noncommutative gauge theories with fermions in the bi-fundamental and adjoint
representations. We find that axial and chiral gauge anomalies coming from
non-planar contributions are derived in the low noncommutative momentum limit
. The adjoint chiral
fermion carries no anomaly in the non-planar sector in
dimensions. It is naturally shown from the path integral method that anomalies
in non-planar sector originate in UV/IR mixing.Comment: 15 pages, no figures, LaTeX, minor corrections and references adde