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A New Method for Evaluating the Electrostatic Potential by Using a MEM X-Ray Diffraction Analysis
Hiroshi Tanaka,Yoshihiro Kuroiwa,Masaki Takata 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.2
Recently, a new method was proposed for evaluating the electrostatic potential in crystalline solids from X-ray diffraction data. It is based on the electron charge density, which is analyzed by using the maximum entropy method (MEM) and Ewald's technique. The algorithm is almost parameter-free, and the electrostatic potential can be evaluated even by those with little or no experience. In this article, the method is reviewed briefly, and an application to a typical ionic crystal, NaCl, is introduced. Recently, a new method was proposed for evaluating the electrostatic potential in crystalline solids from X-ray diffraction data. It is based on the electron charge density, which is analyzed by using the maximum entropy method (MEM) and Ewald's technique. The algorithm is almost parameter-free, and the electrostatic potential can be evaluated even by those with little or no experience. In this article, the method is reviewed briefly, and an application to a typical ionic crystal, NaCl, is introduced.
Satellite Communication System for Multi-Point Data Gathering over Ultra-Wide Area
Tanaka, Hiroshi,Inoue, Satoshi,Tsuchida, Toshihiro,Kazama, Hiroshi 통신위성우주산업연구회 2004 Joint Conference on Satellite Communications Vol.2004 No.-
In this paper, we propose a stellite communications system for gathering data from a lot of observation points scattered over an ultra-wide area. The system configuration takes into account the requirements for a practical data gathering system. The main target of our system is reduced communication cost by using a narrow frequency band and the main feature os an economical data gathering using a group-modem composed of a multi-carrier multi-rate filter bank. We describe our system investigation for channel assignment methods, data gathering sequences, and channel interference suppression between narrow band carries.
Vibration Behavior and Dynamic Stress of Runners of Very High Head Reversible Pump-turbines
Tanaka, Hiroshi Korean Society for Fluid machinery 2011 International journal of fluid machinery and syste Vol.4 No.2
In the development of very high head pumped storage projects, one of the critical problems is the strength of pumpturbine runners. Data obtained by stress measurements of high head pump-turbine runners indicated that dynamic stress due to the vibration of runner might be detrimental, possibly to cause fatigue failure, if the runner were designed without proper consideration on its dynamic behaviour. Numerous field stress measurements of runners and model tests conducted with hydrodynamic similarity revealed that the hydraulic excitation force developed by the interference of rotating runner blades with guide vane wakes sometimes would induce such heavy vibration of runner. Theoretical and experimental investigations on both the hydraulic excitation force and the natural frequencies of runner have been conducted to explore this forced vibration problem.