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MAGNETIC HELICITY OF SOLAR ACTIVE REGIONS AND ITS IMPLICATIONS
SAKURAI T.,HAGINO M. The Korean Astronomical Society 2003 Journal of The Korean Astronomical Society Vol.36 No.suppl1
We have studied the magnetic helicity of active regions by using the data from (1) the photo-electric magnetograph of the Okayama Observatory (1983-1995) and (2) the video magnetograph of NAOJ/Mitaka (1992-2000). The latitude distribution of helicity showed a tendency that the regions in the north (south) hemisphere have negative (positive) helicities, respectively, which is already known as the hemispheric sign rule. If we look into the sign of helicity as a function of time, the sign rule was less definite or was reversed sometimes in the sunspot minimum phase. We also studied the relation between the magnetic helicity and the sunspot tilt angles, and found that these two quantities are positively correlated, which is opposite to the expectation of a theoretical model. The implications of this cycle-phase dependence of helicity signs and the correlation between magnetic he Ii city and sunspot tilt angles are discussed.
Sakurai, Nami,Domoto, Kikuko,Takagi, Shingo Korean Society of Photoscience 2002 Journal of Photosciences Vol.9 No.2
In many plant cells, the positions of chloroplasts change in response to changes in light conditions. In the epidermal cells of the aquatic angiosperm Vallisneria gigantea, the avoidance response of chloroplasts is induced specifically by irradiation with blue light of high intensity. Possible roles of actin cytoskeleton in the blue-light-induced avoidance response of chloroplasts were investigated by partial irradiation and phalloidin staining. We showed that the blue-light-dependent redistribution of chloroplasts was induced only in the limited area, where exposed to blue light, even in individual cells. In addition. in the exposed area, the configuration of actin filaments strikingly changed compared with that before the irradiation. Short and thick bundles of actin filaments surrounding the chloroplasts changed to much longer and thinner bundles with a more stretched array. In contrast, in the unexposed area, neither the distribution of chloroplasts nor the configuration of actin filaments exhibited any changes. Cytochalasin D and latrunculin B inhibited the avoidance response of chloroplasts concomitantly with the fragmentation of actin filaments. These results indicate that the reorganization of actin filaments plays a crucial role in the induction of avoidance response of chloroplasts.
Biomaterials toward Future Medicine
Sakurai, Yasuhisa The Korea Society of Medical and Biological Engine 1986 의공학회지 Vol.7 No.2
It is well known that nonlinear propagation characteristics of the wave in the tissue may give very useful information for the medical diagnoisis. In this paper, a new method to detect nonlinear propagation characteristics of the internal vibration in the tissue for the low frequency mechanical vibration by using bispectral analysis is proposed. In the method, low frequency vibration of f0( = 100Hz) is applied on the surface of the object, and the waveform of the internal vibration x (t) is measured from Doppler frequency modulation of silmultaneously transmitted probing ultrasonic waves. Then, the bispectra of the signal x (t) at the frequencies (f0, f0) and (f0, 2f0) are calculated to estimate the nonlinear propagation characteristics as their magnitude ratio, w here since bispectrum is free from the gaussian additive noise we can get the value with high S/N. Basic experimental system is constructed by using 3.0 MHz probing ultrasonic waves and the several experiments are carried out for some phantoms. Results show the superiority of the proposed method to the conventional method using power spectrum and also its usefulness for the tissue characterization.
Molecular Dynamics of the M intermediate of photoactive yellow protein in solution
Sakurai, Minoru,Shiozawa, Mariko,Arai, Shohei,Inoue, Yoshio,Kamiya, Narutoshi,Higo, Junichi Korean Society of Photoscience 2002 Journal of Photosciences Vol.9 No.2
PYP consists of a water-soluble apoprotein and 4-hydroxycinnamyl chromophore bound to Cys69 via thiolester linkage, Upon absorption of a photon, the photocycle is initiated, leading to formation of several photo-intermediates. Among them, M intermediate is important to understand the signal transduction mechanism of PYP, because it is a putative signaling state. As well known, the dynamics of a protein is closely correlated with the occurrence of its function. Here we report the results of IO ns molecular dynamics (MD) simulation for the M intermediate in aqueous solution and discuss the characteristic feature of this state from a viewpoint of structural fluctuation.
The Recent Tendency of Environmentally-friendly Tackifiers
Sakurai, Yoshihiro The Society of Adhesion and Interface 2007 접착 및 계면 Vol.8 No.1
It is a main trend not to use organic solvents in the adhesive industry from the recent environmental and safe points of view. For example, water-based, hot-melt, or UV curable adhesives are being investigated. Several different kinds of tackifiers that are formulated in the adhesives in order to give them more functional properties like initial tack and higher adhesion, etc., have been proposed to meet the recent trend. Firstly, the characteristics and fundamental properties of the respective materials are presented. In Japan, the trend to develop the water-based adhesives is most remarkable. While the environmental regulations are getting harder, Arakawa Chemical has been spending a lot of energy for the research, and developed toluene-free and solvent free tackifier dispersions that are presented precisely.
Inhibitor Effect of Nickel and Surface Analysis
Sakurai Kiyoshi,Yoshifumi Urano,Tsugito Yamashita 한국표면공학회 2010 한국표면공학회 학술발표회 초록집 Vol.2010 No.11
Gold plating films are used extensively as electronics industry materials, because it is such as high corrosion resistance and conductivity. However, gold plating thin films are probably porous layer. Therefore, nickel plating films under gold plating films are corroded by local cell. In this paper, the inhibitor-effect is investigated by electrochemical technique and structural analysis of surface and interface.
한국의 일본어학습자의 담화전개의 분석 : 접속표현을 중심으로 with a special reference to connectives
Sakurai, Keiko 한국일어일문학회 1999 日語日文學硏究 Vol.35 No.1
이 연구는 한국의 일본어학습자의 담화전개를 접속표현을 중심으로 분석하여, 그 특성을 밝히고, 담화전개능력의 향상을 위한 지도법을 개발하는 것을 목적으로 한다. 학습자의 접속표현의 사용빈도와 종류의 분석에서 중급중과 중급상과의 사이에 비약적인 변화가 보인다는 것을 발견하였다. 다음으로 담화의 질적인 분석의 면에서도 중급상이상의 단계와 중급중이하의 단계와의 사이에 텍스트의 형태, 담화의 흐름, 결속성, 정밀성의 4개의 기준으로 볼 때 큰 차이가 보인다. 그 다음으로 담화전개상의 오용이나 문제점으로는 テ형의 사용, 같은 접속표현의 중복사용, 오용, 지시사의 문제, 수동태와 보조수수동사의 오용등을 검토하여, 여기에 발견된 문제점을 극복하고 중급중에서 중급상이상으로 올리기 위해 필요한 지도요점을 제시하였다.