[en] It is suggested that the usual path integral representation of Euclidean vacuum amplitude (tunneling amplitude) in QCD must be supplemented by the explicit boundary condition corresponding to the spontaneous breaking of chiral SU(N) x SU(N). Adopting the trial wave function introduced by Nambu and Jona-Lasinio, one sees that such a path integral automatically breaks also the additional chiral U(1) symmetry of massless quarks. The catastrophe of semi-classical approach to QCD and 'U(1) problem' would be avoided in this way and one has, in principle, a better starting point for the self-consistent calculation

[en] It is suggested that the usual path integral representation of Euclidean vacuum amplitude in QCD must be supplemented by the explicit boundary condition corresponding to the spontaneous breaking of chiral SU(N) x SU(N). The analogy with quantum mechanical example naturally lead to the trial wave function of Nambu and Jona-Lasinio and this in trun gives the starting point for the self-consistent calculation

[en] A proof-of-concept transient diagnostic expert system has been developed to identify the cause and the type of an abnormal transient in a boiling water nuclear power plant. For this expert system development, the calculational results of the simulation code RETRAN were used as the knowledge source. The knowledge extracted from the RETRAN analyses was transformed into IF-THEN rules in the knowledge base for the expert system. An important feature of this expert system is the introduction of certainty factors to allow diagnosis even in the cases where data may be either missing or marked as invalid. To increase the capability of this diagnostic system to distinguish between similiar transients, backward chaining reasoning is used to support the forward chaining reasoning with certainty factors. Through this effort, it has been demonstrated that an expert system can be successfully used to create a transient diagnostic system. It has also successfully demonstrated that RETRAN can be used as the knowledge source for developing the knowledge base of the diagnostic system

[en] We study theoretically the spin response functions using the relativistic many-body theory. The spin response functions in the relativistic theory are reduced largely from the ones of the non-relativistic theory, in particular the longitudinal spin responses. This fact enables us to remove the difficulty in reproducing the ratio of the longitudinal and transverse response functions seen experimentally. We use the local density approximation with the eikonal prescription of the nuclear absorption on the incoming and outgoing nucleons for the calculations of the response functions of finite nuclei. We compare the calculated results with the recent experimental results with (→p, →n) reactions on C and Ca

[en] Expert system technology has matured enough to offer considerable promise for a number of application areas in the electric utility industry. The number of efforts going on in the industry demonstrates that the potential of expert systems is widely recognized. One possible application is to aid the power plant operators in determining the type and cause of a transient. This information will assist the operator in determining the proper response to the transient. In order to develop a transient diagnostic expert system, it is essential to create a knowledge base which contains the time-varying characteristics of the transients for which the diagnostic system is applicable. Two major sources exist for the development of this knowledge base. The first are actual plant data and the second are the results of simulation codes like RETRAN

[en] We have proposed a new linear synchronous motor (LSM) theory which is based on an idea of considering the pinning force as synchronizing one in using current-carrying-armature-winding instead of permanent magnets. We have carried out basic experiments on two-dimensional electromagnetic forces produced in HTS bulk within DC-magnetic-field. As a result, we found that HTS bulk magnet in a cooling case can be levitated and guided stably according to the flux conditions between bulk and DC magnet. HTS bulk LSM can produce propulsion, levitation and guidance forces from zero speed, and be used in many applications. This paper proposes HTS bulk LSM analyzed and designed taking into account E-J characteristic. The LSM can produce stable guidance force without control. The LSM propulsion and guidance motion can be simulated numerically only by a simple propulsion control, which is not only closed-loop control but also open-loop control

[en] The intergranular stress corrosion cracking (IGSCC) has been found in type 304 stainless steel piping of several BWR plants. It is already well known that IGSCC is most likely to occur when three essential factors, material sensitization, high tensile stress and corrosive environment, are present. If the welding residual stress is sufficiently high (200 to approximately 400 MPa) in the inside piping surface near the welded joint, then it may be one of the biggest contributors to IGSCC. If the residual stress is reduced or reversed by some way, the IGSCC will be effectively mitigated. In this paper a method to improve the residual stress named IHSI (Induction Heating Stress Improvement) is explained. IHSI aims to improve the condition of residual stress in the inside pipe surface using the thermal stress induced by the temperature difference in pipe wall, that is produced when the pipe is heated from the outside surface by an induction heating coil and cooled on the inside surface by water simultaneously. This method becomes more attractive when it can be successfully applied to in-service piping which might have some pre-flaw. In order to verify the validity of IHSI for such piping, some experiments and calculations using finite element method were conducted. These results are mainly discussed in this paper from the view-points of residual stress, flaw behaviour during IHSI and material deterioration. (author)

[en] A high power microwave monitor has been designed and fabricated for use at INS 15 MeV injector linac, which is fed with the microwave of 6 MW peak power. The signals is picked up through two-hall directional coupler which is composed of the main and the auxiliary rectangular-waveguides and of current transformer from waveguide to coaxial cable. The monitors are installed upstream and downstream the accelerator structure and serve to detect the input, reflected and output power levels and pulse forms. (auth.)

No abstract available

[en] We have designed the 500W high power solid-state amplifier for the microwave system of INS electron linac. In this design study the output pulse power level of each module is set as possible as high, so the total number of elements is well reduced within the present microwave technics. In comparison with TWTA highly stabilized and maintenance-free operations are expected with 5 years' MTF. (auth.)