21 research outputs found
Methodology for the Determination of a Set of Safety Factors That are Consistent for Design Code and Fitness-for-Service Code: Framework
No full textThis paper introduces a methodology for the determination of a complete set of safety factors that maintains consistency between design code and fitness-for-service code of nuclear components. The purpose of the work is to materialize the System Based Code concept, which is indispensable for the development of next generation nuclear reactors. The methodology consists of three principles proposed by the author which should be the basis of code development for new next generation reactors. The principles are; 1) Design to target reliability, 2) Continuous reliability evaluation from design to fitness-for-service, 3) Update of reliability evaluation based on information obtained during construction and operation. Effectiveness of the methodology is demonstrated using a simple example problem. The problem deals with pipe subjected to internal pressure under conditions which is typical in light water reactors. Following the reliability evaluation of current situation which meets the provisions of design code and fitness-for-serve code published from Japan Society of Mechanical Engineers, the three principles are applied step-by-step and safety factors and reliability indices are newly derived. It is shown that a complete application of the three principles could lead to a set of safety factors that assures consistency in terms of reliability in design and fitness-for-service, and improves allowable stresses as well. Technologies to be developed and issues to be discussed for application of the methodology to more complicated and practical situations are described as well.</jats:p
Slant Geometry of Spacelike Hypersurfaces in Hyperbolic space and de Sitter space
Get PDFWe consider a one-parameter family of new extrinsic differential geometries\ud
on hypersurfaces in Hyperbolic space. Recently, the second author and his collaborators have\ud
constructed a new geometry which is called horospherical geometry on Hyperbolic space.\ud
There is another geometry which is the famous Gauss-Boryay-Robechevski geometry (i.e., the\ud
hyperbolic geometry) on Hyperbolic space. The slant geometry is a one-parameter family of geometries which\ud
connect these two geometries. Moreover, we construct a one-parameter family of geometries on\ud
spacelike hypersurfaces in de Sitter space
A case report of intractable decubitus ulcer probably dut to the decrease of Blood Coagulation Factor XIII.
No full textSlant geometry of spacelike hypersurfaces in hyperbolic space and de Sitter space
No full textWe consider a one-parameter family of new extrinsic differential geometries on hypersurfaces in hyperbolic space. Recently, the second author and his collaborators have constructed a new geometry which is called horospherical geometry on hyperbolic space. There is another geometry which is the famous Gauss-Bolyai-Robecheyski geometry (i.e., the hyperbolic geometry) on hyperbolic space. The slant geometry is a one-parameter family of geometries which connect these two geometries. Moreover, we construct a one-parameter family of geometries on spacelike hypersurfaces in de Sitter space
Comparison of Mixing Performance Based on Phase Difference in Modified New AM Impeller
No full textHelical ribbon impellers are commonly used for mixing high-viscosity fluids, but they are expensive to manufacture. To address this, the authors developed the Advanced Mixing (AM) impeller, which demonstrated higher mixing efficiency compared to other high-viscosity impellers. In a subsequent study, the authors explored reducing the number of basic components in the AM impeller to further lower costs. The development process of the AM impeller and its high mixing efficiency have been described in detail in our previous studies (Furukawa et al., 2023, 2025), and the present results further demonstrate the consistent high performance of this impeller. Meanwhile, many multistage impellers for high-viscosity applications, produced by both domestic and international manufacturers, feature blades arranged with a 90-degree phase shift. Therefore, the authors evaluated the performance of the AM impeller using the same configuration. They found that using the concept of pitch ratio allows for the simultaneous evaluation of the number of stages and phase, enabling the determination of the optimal configuration for the AM impeller
Papel do zinco no sistema nervoso central: defesas antioxidantes e sinalização celular via PI3K/AKT
Get PDFDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciencias Biológicas. Programa de Pós-Graduação em Neurociências
