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[en] We study the proposed duality between the 5-dimensional supergravity/superstring on AdS₃xS² and the 2-dimensional N=(0,4) SCFT defined on the boundary of AdS-space. We construct explicitly the N=(0,4) SCFT by imposing the ''quiver projection'' developed by Douglas-Moore on the N=(4,4) SCFT of symmetric orbifold, which is proposed to be the dual of the 6-dimensional supergravity/superstring on AdS₃xS³. We explore in detail the spectrum of chiral primaries in this ''quiver SCFT₂''. We compare it with the Kaluza-Klein spectrum on AdS₃xS² and check the consistency between them. We further emphasize that orbifolding of bulk theory should not correspond to orbifolding of the boundary CFT in the usual sense of two dimensional CFT, rather corresponds to the quiver projection. We observe that these are not actually equivalent with each other when we focus on the multi-particle states. (author)

[en] We analyze the Coulomb branch of matrix string theory in the presence of NS5-branes. If we regard the components of U(1) gauge fields as the dualized longitudinal coordinates, we obtain the symmetric product of AdS₃xS³xR⁴ as the geometry of Coulomb branch. We observe that the absence or presence of the nonzero electric flux determine whether the string propagates in bulk as an ordinary closed string or is forced to live near the boundary. We further discuss the issues of physical spectrum from the viewpoint of Matrix string theory. We show that the twisted sectors of CFT on the symmetric orbifold, which correspond to glued strings, turn out to yield many chiral primaries that were hitherto considered to be missing. We also comment on the threshold energy in Liouville sector where continuous spectrum begins. (author)

[en] We explore the superstring theory on $AdS₃xS³xT⁴$ in the framework given in hep-th/9806194. We argue on the Hilbert space of ''space-time CFT'', especially, constructing a suitable vacuum of this CFT from the physical degrees of freedom of the superstring theory in bulk. We first construct it explicitly in the case of $p=1$, and then present a proposal for the general cases of $p>1$. After giving some completion of the GKS's calculations about the higher mode operators (in particular, about the part including spin fields), we also present some comparison between the space-time CFT and $T^{4^kp}/S_{kp}$ SCFT, namely with respect to the physical spectrum of chiral primaries and some algebraic structures of bosonic and fermionic oscillators in both theories. We also observe how our proposal about the Hilbert space of space-time CFT can lead to a satisfactory correspondence between the spectrum of chiral primaries in both theories in the cases $p>1$. (author)

[en] We study the (p,q)5-brane dynamics from the viewpoint of Matrix string theory in the T-dualized ALE background. The most remarkable feature in the (p,q)5-brane is the existence of ''fractional string'', which appears as the instanton of 5-brane gauge theory. We approach to the physical aspects of fractional string by means of the two types of Matrix string probes. (author)

[en] To achieve a low-carbon society, we promote utilization of nuclear energy, which plays a zero-emission power generation. Therefore the nuclear power plants have been imposed a stable supply of electricity. The condition based maintenance (CBM) is effective in order to maintain a stable operation of the nuclear power plants. We built the performance diagnosis system based on the heat and mass balance calculation as one of supporting tools for the CBM. Moreover we note that the performance diagnosis system is built for steam turbine cycle operating with saturated steam conditions. (author)

[en] Simulation analyses for forced vibration tests of a large scaled containment mode at Hualien in taiwan will be presented in this paper. A hybrid method, that combines the boundary integral equation method and the finite element method, is used for the analyses. Through comparisons of the prediction and post-correlation results with the actual test results, the reliability of the present hybrid method is confirmed. It is pointed out in this study that determination of soil properties in the near field of the foundation is very important to evaluate soil-structure interaction effects properly. (author). 3 refs., 6 figs., 10 tabs

[en] A Large-Scale Seismic Test (LSST) Program conducted at Hualien (stiff soil site). Taiwan, has started to obtain earthquake-induced soil-structure interaction (SSI) data as an extension of the same kind of program conducted at Lotung (soft soil site). Two tests have been performed: a Forced Vibration Test without embedment and the same test with embedment. Horizontal excitations were applied in two different directions both on the roof slab and on the basemat of a 1/4-scale containment model. Vertical excitations were applied on the basemat only. The concept of Principal Axes (D₁, D₂) was introduced for the SSI system, and the basic dynamic characteristics of the soil-structure system were obtained for D₁ and D₂. As an example, peak frequencies for horizontal excitation were 4.1 and 4.6 Hz without embedment, and 6.1 and 6.3 Hz with embedment for D₁ and D₂ based on results transformed to principal axes. Finally, a soil impedance function was obtained by a newly defined error minimizing method. This function also simulates the classic embedment effect. (author). 5 refs., 9 figs., 1 tab

[en] A large-scale seismic test (LSST) programme conducted at Hualien (stiff soil site), Taiwan, has started (Tang et al., 1991) to provide earthquake-induced soil-structure interaction (SSI) data as an extension of the same kind of program conducted at Lotung (soft soil site) (EPRI, 1989). Two tests have been performed: a forced vibration test (FVT) without embedment (Morishita et al., 1993) and the same test with embedment. Horizontal excitations were applied in two different directions both on the roof slab and on the basemat of a 1/4-scale containment model. Vertical excitations were applied on the basemat only. The concept of 'principal axes (D₁, D₂)' was introduced for the SSI system, and the basic dynamic characteristics of the soil-structure system were obtained for D₁ and D₂. As an example, resonance frequencies for horizontal excitations were 4.1 and 4.6 Hz without embedment, and 6.1 and 6.3 Hz with embedment for D₁ and D₂ based on results transformed to principal axes. Finally, a soil impedance function was obtained by a newly defined error minimizing method. This function also simulates the classic embedment effect. (orig.)

[en] The radiation control system for automated locks, personal status, and recordings in the database was developed at Laboratory of Nuclear Science (LNS), Tohoku University. It consists of the Programmable Logic Controllers (PLC) for the entrance system and Windows PC. The PLC is controlled with Fins Gateway and Compolet on the Windows PC through an ethernet. The SQL Server 2000 was also installed on the Windows PC for database management. In the system, personal data such as destination, purpose, working hours and radiation dose are stored in the database. Furthermore, monthly report of personal data can easily be printed out by using the system. Personal status can be checked by a status monitor of the accelerator in the operation room and the entrance of the radiation controlled area, etc. (author)