[en] It is shown through comparison to experimental, theoretical, and other finite element formulations that the finite element displacement method can solve accurately and economically a certain class of solid-fluid eigenvalue problems. The problems considered are small displacements in the absence of viscous damping and are 2-D and 3-D in nature. In this study the advantages of the finite element method (in particular the displacement formulation) is apparent in that a large structure consisting of the cylinders, support flanges, fluid, and other experimental boundaries could be modeled to yield good correlation to experimental data. The ability to handle large problems with standard structural programs is the key advantage of the displacement fluid method. The greatest obstacle is the inability of the analyst to inhibit those rotational degrees of freedom that are unnecessary to his fluid-structure vibration problem. With judicious use of element formulation, boundary conditions and modeling, the displacement finite element method can be successfully used to predict solid-fluid response to vibration and seismic loading

[en] This book covers the proceedings of a symposium presented at the 1990 Pressure Vessels and Piping Conference. Topics in this volume include: Computer-aided design of piping system supports, Computer simulations for use in vessel design, and; A program for classification of three-dimensional finite element stresses on a plane

[en] The nuclear accident of Fukushima Daiichi reveals that Station Blackout (SBO) may last longer than 8 hours. However, the original design may not have sufficient capacity and capability to cope with a SBO for more than 8 hours. In view of this, Taiwan Power Company has initiated several improvement works to enhance the plant capability against SBO. Based on the improved plant configuration, a SBO coping analysis is performed in this study in order to assess whether the Lungmen ABWR plant has the capability to cope with SBO for 24 hours with respect to maintaining the integrity of the reactor core. The steam driven Reactor Core Isolation Cooling (RCIC) system provides water to the reactor vessel during SBO. Major factors affecting RCIC's functionality during the event have been assessed and identified, including -1) reactor monitoring function, -2) steam supply to the RCIC turbine, -3) DC battery capacity, -4) water source inventory, -5) RCIC room temperature, and -6) Main Control Room temperature. Lungmen ABWR plant has an additional feature of core cooling, which is AC Independent Water Addition (ACIWA) mode of RHR. ACIWA allows water from the Fire Protection System (FPS) to be pumped to the vessel. The analyses are performed using RETRAN-3D models. Two categories of SBO scenarios are considered, one with reactor pressure vessel depressurization and another one with no reactor pressure vessel depressurization. The depressurization process is through manual opening of the SRV/ADS. For the depressurization case, the reactor pressure is reduced to a value of approximately 180 psia such that the low- pressure ACIWA can be used as a backup core cooling system in case of RCIC failure. Sensitivity study is also performed to evaluate the effect of different RCIC available time on the response of the reactor water level. The minimum required available time for the RCIC operation to maintain the core integrity during the extended SBO period of 24 hours is then identified. (authors)

[en] A girder control system is proposed to quickly and precisely adjust the displacement and rotating angle of all girders in the storage ring with little manpower at the Taiwan Photon Source (TPS) project at National Synchrotron Research Center (NSRRC). In this control girder system, six motorized cam movers supporting a girder are driven on three pedestals to perform six-axis adjustments of a girder. A tilt-meter monitors the pitch and roll of each girder; several touch sensors measure the relative displacement between consecutive girders. Moreover, a laser position sensitive detector (PSD) system measuring the relative displacement between straight-section girders is included in this girder control system. Operator can use subroutines developed by MATLAB to control every local girder control system via the web. The test results show that the girder control system adjusts girders quickly, precisely and stably

[en] The primary objective of the Computer Technology Committee of the ASME Pressure Vessels and Piping Division is to promote interest and technical exchange in the field of computer technology, related to the design and analysis of pressure vessels and piping. The topics included in this volume are: analysis of bolted joints; nonlinear analysis, applications and methodology; finite element analysis and applications; and behavior of materials. Separate abstracts were prepared for 23 of the papers in this volume

[en] In this work, the magnetic resonance (MR) of Fe₃O₄, ZnFe₂O₄, and NiFe₂O₄ is measured in order to investigate the doping effects of Zn and Ni. Our results clearly demonstrate a distinct difference in the dynamic behaviors of resonance field and resonance linewidth among these three samples. Based on the data of g-factor vs. temperature, the magnetic coupling in Fe₃O₄ and NiFe₂O₄ is much larger than that of ZnFe₂O₄. Furthermore, the MR spectrum of ZnFe₂O₄ splits into two lines above 170 K. The possible mechanism causing the dramatically different patterns of magnetic phases in these samples is discussed

[en] We investigate Co/Nb multilayers to explore the spontaneous π-phase shift between the superconducting (SC) layers, which is attributed for causing the non-monotonic change of the SC transition temperature (T _c) with the ferromagnetic (FM) layer thickness (t _FM) in several FM/SC multilayered systems. The issue of interfacial roughness is also explored by growing Co/Nb multilayers at various sputtering pressures. Transport measurements show a non-monotonic dependence of T _c on t _FM, and this dependence is insensitive to the structural variation present in the samples, as measured by X-ray scattering

[en] The Taiwan Photon Source (TPS) is a 3-GeV synchrotron facility designed to have a low-emittance electron beam and to be maintained with top-up operation. A TPS injection section (length 12 m) contains four injection kickers (K1–K4) and one injection septum outside vacuum to provide the stored beam with a horizontal bump for beam injection off axis. Kickers K2 and K3 and the injection septum are placed in an adjustable plate, which can provide displacement of 5 mm for the injected beam near the stored beam so as to decrease the kicker strength. The construction of the injection section is completed; we here describe its design and manufacture, and present some test results for the injection section