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TADASHI HASEGAWA,TAKESHI AKASAKA,YUTAKA MAEDA,MASAHIRO HASHIMOTO,MAKOTO KANDA,TAKAHIRO TSUCHIYA,TAKATSUGU WAKAHARA,YUHEI MIYAUCHI,SHIGEO MARUYAMA,JING LU,SHIGERU NAGASE 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2007 NANO Vol.2 No.4
Single-walled carbon nanotubes (SWNTs) synthesized by catalytic decomposition of an alcohol were purified by extraction. The purified SWNTs were characterized on the basis of visible-near infrared (vis-NIR) absorption, photoluminescence and Raman spectroscopic analyses, scanning electron microscopy (SEM) observation, and thermal analysis. Selective extraction of metallic nanotubes was also achieved by the extraction condition.
Extended supersymmetry in Dirac action with extra dimensions
Fujimoto, Yukihiro,Hasegawa, Kouhei,Nishiwaki, Kenji,Sakamoto, Makoto,Tatsumi, Kentaro,Ueba, Inori IOP 2018 JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL Vol.51 No.43
<P>We investigate a new realization of extended quantum-mechanical supersymmetry. We first show that an <img ALIGN='MIDDLE' ALT='' SRC='http://ej.iop.org/images/1751-8121/51/43/435201/aaadea2ieqn001.gif'/> quantum-mechanical supersymmetry is hidden in the four-dimensional (4D) spectrum of the Kaluza–Klein decomposition for the higher dimensional Dirac field, that is, Kaluza–Klein mode functions of 4D right-handed spinors and 4D left-handed ones form <img ALIGN='MIDDLE' ALT='' SRC='http://ej.iop.org/images/1751-8121/51/43/435201/aaadea2ieqn002.gif'/> supermultiplets. In addition to <img ALIGN='MIDDLE' ALT='' SRC='http://ej.iop.org/images/1751-8121/51/43/435201/aaadea2ieqn003.gif'/> supersymmetry, we discover that an <img ALIGN='MIDDLE' ALT='' SRC='http://ej.iop.org/images/1751-8121/51/43/435201/aaadea2ieqn004.gif'/>-extended supersymmetry (<img ALIGN='MIDDLE' ALT='' SRC='http://ej.iop.org/images/1751-8121/51/43/435201/aaadea2ieqn005.gif'/> for <I>d</I> = even (odd) extra dimensions) is further hidden in the 4D spectrum. The extended symmetry can explain additional degeneracy of the spectrum. Furthermore, we show that a superpotential can be introduced into the <img ALIGN='MIDDLE' ALT='' SRC='http://ej.iop.org/images/1751-8121/51/43/435201/aaadea2ieqn006.gif'/>-extended supercharges and clarify the condition to preserve the supersymmetry. The partial breaking of the supersymmetry is also demonstrated.</P>
Nakamura, Chikashi,Hasegawa, Miki,Shimada, Kazumi,Shirai, Makoto,Miyake, Jun The Korean Society for Biotechnology and Bioengine 2000 Biotechnology and Bioprocess Engineering Vol.5 No.6
In this study, a direct detection system for triazine derivative herbicides was developed using the photosynthetic reaction center (RC) from the purple bacterium, Rhodobacter sphaeroides, and surface plasmon resonance (SPR) apparatus. The histidine-tagged RCs were immobilized on an SPR gold chip using nickel-nitrilotriacetic acid groups as a binder for one of the triazine herbicide, atrazine. The SPR responses were proportional to the sample concentrations of atrazine in the range 0.1-1 $\mu\textrm{g}$/mL. The sensitivity of the direct detection of atrazine using the RC-assembled sensor chip was higher than that using the antibody-immobilized chip. The other types of herbicides, DCMU or MCPP, were not detected with such high sensitivity. The results indicated the high binding selectivity of the RC complex.
Characterization of crystalline linear (1→3)-α-<small>D</small>-glucan synthesized <i>in vitro</i>
Kobayashi, Kayoko,Hasegawa, Takuto,Kusumi, Ryosuke,Kimura, Satoshi,Yoshida, Makoto,Sugiyama, Junji,Wada, Masahisa Applied Science Publishers 2017 Carbohydrate polymers Vol.177 No.-
<P><B>Abstract</B></P> <P>We investigated the crystal structure and molecular arrangement of the linear (1→3)-α-<SMALL>D</SMALL>-glucan synthesized by glucosyltransferase GtfJ cloned from <I>Streptococcus salivarius</I> using sucrose as a substrate. The synthetic products had two morphologies: wavy fibril-like crystals as major and thin lamellae as minor products. Their structures were analyzed using electron microdiffraction, synchrotron X-ray powder diffraction, and solid-state <SUP>13</SUP>C NMR spectroscopy. The fibrils and lamellae had the same allomorphic form but different molecular arrangements. The wet crystals were in a hydrated form, which converted into an anhydrous form with a significant decrease in crystallinity on drying. The hydrated and anhydrous forms had an extended-chain conformation with 2/1 helix, and the hydrated form was estimated to contain one water molecule per glucose residue. The long glucan chains were folded in the fibril crystals, while the short, extended chains were arranged perpendicular to the base plane of the lamellae.</P> <P><B>Highlights</B></P> <P> <UL> <LI> (1→3)-α-<SMALL>D</SMALL>-Glucan was synthesized by recombinant glucosyltransferase sing sucrose. </LI> <LI> The synthetic products had two morphologies: wavy fibril and thin lamella. </LI> <LI> Both products had the same crystal structures but different molecular arrangements. </LI> <LI> Molecular chains were folded in the fibril but extended in the lamellar crystals. </LI> <LI> The hydrated form was converted into an anhydrous form by drying. </LI> </UL> </P>
Development of Wave Overtopping–Overflow Transition Model Based on Full-scale Experiments
Hajime Mase,Sooyoul Kim,Makoto Hasegawa,Jae-Hoon Jeong,윤종성 한국해양공학회 2020 韓國海洋工學會誌 Vol.34 No.2
When high waves and storm surge strike simultaneously, the characteristics of the fluid field change drastically from overtopping according to the wave runup height to overflow through a transition state that combines overtopping and overflows. However, an estimation model or evaluation method has not yet been established because there is not enough engineering data. This study developed a wave overtopping-overflow transition model based on a full-scale experiment involving wave overtopping and overflow transition, which appropriately reproduced the effect of waves or the temporal change in inundation flow. Using this model to perform a calculation for the wave overtopping and overflow transition process under typical circumstances, this study determined the wave runup height and features of the inundation flow under time series changes as an example.
Development of New Rainfall Information Analysis System (RIAS) to Predict Landslide Occurrence
( Min-sun Lee ),( Makoto Hasegawa ),( Akihiro Sakai ),( Young-suk Song ),( Min Seok Kim ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
Apart from the situation long ago, heavy rain has become more frequent recently. Large-scale landslides cause huge damages to human’s safety, residence, and to the infrastructure. In order to announce early warnings of landslide, it is necessary to acknowledge the occurrence of landslide in advance and to predict the happening time. Accurate rainfall information and analysis techniques are necessary because the main cause of landslides is heavy rainfall. Therefore, the new rainfall information analysis system was developed in this study. This system utilize the Meso-Scale Model(MSM) for weather forecast and the Local Forecast Model(LFM) provided by the Japan Meteorological Agency as well as information provided by weather forecast of the Korea Meteorological Agency and the monitoring system data of KIGAM(Korea institute of geoscience and mineral resources) for more accurate rainfall information. This system provides the rainfall data according to the requests of users and other systems and display 2D and stereoscopic display of rainfall data and analysis results. Based on that, the occurrence of landslide can be predicted and an early warning can be issued to dangerous areas from a few hours to 1 day before. Therefore, it is expected to reduce the damage in case of the landslide disaster.
OPTICAL AND NEAR-INFRARED POLARIMETRY FOR A HIGHLY DORMANT COMET 209P/LINEAR
Kuroda, Daisuke,Ishiguro, Masateru,Watanabe, Makoto,Akitaya, Hiroshi,Takahashi, Jun,Hasegawa, Sunao,Ui, Takahiro,Kanda, Yuka,Takaki, Katsutoshi,Itoh, Ryosuke,Moritani, Yuki,Imai, Masataka,Goda, Shuhei IOP Publishing 2015 The Astrophysical journal Vol.814 No.2
<P>We conducted an optical and near-infrared polarimetric observation of the highly dormant Jupiter-Family Comet, 209P/LINEAR. Because of its low activity, we were able to determine the linear polarization degrees of the coma dust particles and nucleus independently, that is P-n = 30.3(-0.9)(+1.3)% at alpha = 92 degrees.2 and P-n = 31.0(-0.7)(+1.0)% at alpha = 99 degrees.5 for the nucleus, and P-c = 28.8(-0.4)(+0.4)% at alpha = 92 degrees.2 and 29.6(-0.3)(+0.3)% at alpha = 99 degrees.5 for the coma. We detected no significant variation in P at the phase angle coverage of 92 degrees.2-99 degrees.5, which may imply that the obtained polarization degrees are nearly at maximum in the phase-polarization curves. By fitting with an empirical function, we obtained the maximum values of linear polarization degrees P-max = 30.8% for the nucleus and P-max = 29.6% for the dust coma. The P-max of the dust coma is consistent with those of dust-rich comets. The low geometric albedo of P-v. =. 0.05 was derived from the slope-albedo relationship and was associated with high P-max. We examined P-max-albedo relations between asteroids and 209P, and found that the so-called Umov law seems to be applicable on this cometary surface.</P>