Kiyotake Shinoda

AC loss performance of the 100 kWh SMES model coil

AC loss tests of the SMES model coil for 100 kWh SMES pilot plant were carried out at Lawrence Livermore National Laboratory (LLNL) in 1998, in collaboration between Japan and the USA. The AC loss results at LLNL were in good agreement with those obtained at the Japan Atomic Energy Research Institute (JAERI) in 1996. The coupling loss in the coil could be described by two components with a short time constant (0.22s) and a long time constant (30s). The short time constant was in good agreement with that measured in a short sample. The signals of Hall probes, mounted on the surface of the coil, revealed that the induced loop currents in the conductor decayed with long time constants. At least two long time constants were observed: about 4s and 100s. The long time constant was also identified by the observation of voltage decay after the coil discharge. These loops result in the additional AC loss in the coil. Effect of lateral force in the cable on losses was studied as well. An improved conductor aiming to reduce the AC loss was designed, fabricated and wound in a small coil. The measured AC loss in the small coil made of the improved conductor was about 1/6 of the SMES model coil per strand volume.

Therapeutic Effect of Nerve Root Infiltration for Lumbar Disc Herniation

The purpose of this paper was to describe the therapeutic effect of nerve root infiltration for lumbar disc herniation. 108 patients diagnosed as lumbar disc herniation, who underwent nerve root infiltration, were divided into two groups, conservative and operative groups.The results were as follows.1) We can expect the good therapeutic effect of nerve root infiltration for older patients who are slightly possitive in SLR test.2) We can predict the therapeutic effect at the time of 24 hours after the 1st nerve root infiltratioln.