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( Shigetoshi Takahashi ),( In-hee Hwang ),( Takayuki Matsuo ),( Toshihiko Matsuto ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 3RINCs초록집 Vol.2015 No.-
Fabric filter is widely used as typical dust collection equipment in the waste incineration facilities. On the other hand, the pressure drop in the fabric filter occupies a large amount of energy loss of the flue gas treatment system. Meanwhile, the repetitive reduction of the pressure drop in bag house was reported by spraying phosphoric acid wastewater (PAW) into incinerator. The decrease of pressure drop on fabric filter is important because it is deeply related to saving of energy consumption in waste incineration plants. In this study, the operating data of incineration plant was analyzed to investigate the short-term and long-term effect on pressure drop by spraying PAW. As the short-term effect of PAW spray, the total reduction of pressure drop of fabric filter was always decreased but it was not proportional to the amount of phosphorus into the incinerator. There was no clear correlation between the total reduction of the pressure drop and the utilization period of fabric filters. The total reduction of pressure drop was range from 0.3 to 1.2 kPa regardless the utilization period of fabric filters. On the other hand, as the long- term effect of PAW spray, nevertheless the pressure drop rarely increased without spraying PAW, the pressure drop showed a gradual increase trend at the normal operating period after finishing spraying PAW. Especially it was remarkable that the pressure drop increased at the spraying PAW just after the replacement of all fabric filters. These results suggest that the spraying PAW produces the reduction of pressure drop in the short-term but leads to the increase of pressure drop increase and makes the operating condition worse from the long-term viewpoint.
Shigetoshi Sota,Masaki Itoh 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.1
The kernel polynomial method (KPM), developed by Voter et al, has been recognized as an effective order-N method for calculating the eigenvalue spectrum of a large Hamiltonian. The efficiency of its algorithm is due to the three-term recurrence formula of the polynomial. The central issue is, however, how the Gibbs oscillation can be suppressed and the technique of the Gibbs damping factor has been used with the aid of a particular property of the Chebysheff polynoimial. In this study, we propose a new method that substitutes for the original KPM by using Legendre polynomial. Instead of using the damping factor, we introduce a new basis set by regulating the polynomial in such a way that the series is bound to converge to the exact Green's function without having Gibbs oscillations. The scheme is general enough to deal with the entire family of physical quantities that can be related to the Green's function. This includes the two-particle properties such as electron transport. It further enables the eigenvectors to be calculated in the same algorithm. In all these calculations, the numerical precision is unlimited and is controlled solely by the order of the truncation. The accuracy is confirmed up to six digits in our numerical tests for the dynamics of a simple cubic lattice of 19^3 atoms. We also show a preliminary calculation of the dc transport for the 2D-Anderson model. The kernel polynomial method (KPM), developed by Voter et al, has been recognized as an effective order-N method for calculating the eigenvalue spectrum of a large Hamiltonian. The efficiency of its algorithm is due to the three-term recurrence formula of the polynomial. The central issue is, however, how the Gibbs oscillation can be suppressed and the technique of the Gibbs damping factor has been used with the aid of a particular property of the Chebysheff polynoimial. In this study, we propose a new method that substitutes for the original KPM by using Legendre polynomial. Instead of using the damping factor, we introduce a new basis set by regulating the polynomial in such a way that the series is bound to converge to the exact Green's function without having Gibbs oscillations. The scheme is general enough to deal with the entire family of physical quantities that can be related to the Green's function. This includes the two-particle properties such as electron transport. It further enables the eigenvectors to be calculated in the same algorithm. In all these calculations, the numerical precision is unlimited and is controlled solely by the order of the truncation. The accuracy is confirmed up to six digits in our numerical tests for the dynamics of a simple cubic lattice of 19^3 atoms. We also show a preliminary calculation of the dc transport for the 2D-Anderson model.
Numerical Study of Roton-Like Collective Excitations in Glassy Materials
Shigetoshi Sota,Masaki Itoh 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.1
Roton-like collective excitations of non-quantum origin have been recognized for quite a long time in many structurally disordered materials. A classical study is attempted of a computer-quenched Lennard-Jones glass in the present article. We show that the collective excitations involve vortex motions, as argued by Feynman for quantum liquids. Adopting the harmonic approximation, we constructed the dynamical structure factor and calculated its eigenvectors at several frequencies in order to visualize the respective atomic motions. Some of them are just like those predicted by Feynman, although we obtained them irrelevant of the Bose statistics. We also calculated the dynamical structure factor and confirmed the characteristic roton minimum in the dispersion relation, which is quantitatively close to that observed for liquid Ar.
尾下成敏(Oshita Shigetoshi) 인천대학교 인문학연구소 2012 인문학연구 Vol.17 No.-
This paper introduces the studies conducted from the 1980s to the 2000s on the Daimyo clan of the Tokugawa period, along with the introduction of the research history on the master-servant relationship. The introduction of the research history mainly deals with the studies of Asao Naohiro (朝尾直広), Kasaya Kazuhiko (笠谷和比古), Takano Nobuharu (高野信治), Fukuda Jijeuru (福田千鹤), Fujita Datsuoh (福田达生), Miyake, Masathiro (三宅正浩). and discusses the distinctive characteristics of these studies from the 1990s, 1980s, and 2000s respectively. The following points have been confirmed by these studies. First, the relationship between Daimyo as an individual and a Daimyo courtier was not necessarily static. Secondly, the Daimyo clan was an object of loyalty for Daimyo courtiers. Nowadays, it is very difficult to discuss the master-servant relationship of the Tokugawa period without distinguishing Daimyo as an individual from Daimyo as a clan.