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Nakayama, S.,Mauger, C.,Ahn, M.H.,Aoki, S.,Ashie, Y.,Bhang, H.,Boyd, S.,Casper, D.,Choi, J.H.,Fukuda, S.,Fukuda, Y.,Gran, R.,Hara, T.,Hasegawa, M.,Hasegawa, T.,Hayashi, K.,Hayato, Y.,Hill, J.,Ichikawa Elsevier 2005 Physics letters: B Vol.619 No.3
<P><B>Abstract</B></P><P>Neutral current single <SUP>π0</SUP> production induced by neutrinos with a mean energy of 1.3 GeV is measured using a 1000 ton water Cherenkov detector in the K2K long baseline neutrino experiment. The cross section for this process relative to the total charged current cross section is measured to be 0.064±0.001(stat.)±0.007(sys.). The momentum distribution of neutral current <SUP>π0</SUP>s from a water target is measured with high statistics for the first time.</P>
Interference Effect betweenϕandΛ(1520)Production Channels in theγp→K+K−pReaction near Threshold
Ryu, S. Y.,Ahn, J. K.,Nakano, T.,Ahn, D. S.,Ajimura, S.,Akimune, H.,Asano, Y.,Chang, W. C.,Chen, J. Y.,Daté,, S.,Ejiri, H.,Fujimura, H.,Fujiwara, M.,Fukui, S.,Hasegawa, S.,Hicks, K.,Horie, K.,Ho American Physical Society 2016 Physical Review Letters Vol.116 No.23
<P>The phi-Lambda(1520) interference effect in the gamma p -> K(+)K(-)p reaction has been measured for the first time in the energy range from 1.673 to 2.173 GeV. The relative phases between phi and Lambda(1520) production amplitudes were obtained in the kinematic region where the two resonances overlap. The measurement results support strong constructive interference when K+K- pairs are observed at forward angles but destructive interference for proton emission at forward angles. Furthermore, the observed interference effect does not account for the root s = 2.1 GeV bump structure in forward differential cross sections for phi photoproduction. This fact suggests possible exotic structures such as a hidden-strangeness pentaquark state, a new Pomeron exchange, or rescattering processes via other hyperon states.</P>
Hasegawa, S.,Shinozaki, K.,Honma, T.,Dimitrov, V.,Kim, H.G.,Komatsu, T. North-Holland 2016 Journal of non-crystalline solids Vol.452 No.-
<P>Glasses based on the system of Y2O3-BaO-Nb2O5-B2O3, corresponding to the pseudo-binary 64Ba(1 - x)Y(2x/3)Nb(2)O(6)-B2O3 with x = 0.1-0.5, were prepared, and their thermal properties, electronic polarizabilities, optical basicities, and crystallization behavior were clarified. The glasses showed the glass transition temperature of 602-610 degrees C, crystallization peak temperature of 686-676 degrees C, and refractive index of 1.967-2.007. All the glasses showed the bulk crystallization behavior, providing Ba1 - xY2x/3Nb2O6 nanocrystals with a tetragonal tungsten bronze structure. It was found from high resolution transmission electron microscope observations that the morphology of Ba1 - xY2x/3Nb2O6 nanocrystals is ellipsoidal and their average particle size is in the range of 20-40 nm. The glass-ceramics with Ba1 - xY2x/3Nb2O6 nanocrystals showed high dielectric constants (frequency: 1 kHz) of similar to 90 at room temperature and a ferroelectric nature. Highly oriented Ba1 - xY2x/3Nb2O6 crystal lines were patterned by laser (continuous wave Yb:YVO4 fiber laser with a wavelength of 1080 nm) irradiation with the condition of a laser power of 1.9 W and a laser scanning speed of 4 pm/s and with the laser focal position of 20 mu m beneath from the surface in 2NiO-1.1Y(2)O(3)-29.8BaO-33.1Nb(2)O(5)-36B(2)O(3) glass. (C) 2016 Elsevier B.V. All rights reserved.</P>
Field electron emission from polycrystalline GaN nanorods
S. Hasegawa,S. Nishida,T. Yamashita,H. Asahi 한양대학교 세라믹연구소 2005 Journal of Ceramic Processing Research Vol.6 No.3
We have grown polycrystalline GaN both on polycrystalline Mo sheets and on Si(001) substrates with native oxide by using plasma-assisted molecular beam epitaxy. It has been found that GaN growth on Si(001) with native oxide produces well corientated nanorods exhibiting a low field emission threshold of 1.25 V/μm at 0.1 μA/cm2 and a high emission current density of 2.50 mA/cm2 at an applied electric field of 2.5 V/μm. We will review the growth of polycrystalline GaN films and the evaluation of their structural properties and electron field emission characteristics.
Lightcurve survey of V-type asteroids in the inner asteroid belt
Hasegawa, S.,Miyasaka, S.,Mito, H.,Sarugaku, Y.,Ozawa, T.,Kuroda, D.,Nishihara, S.,Harada, A.,Yoshida, M.,Yanagisawa, K.,Shimizu, Y.,Nagayama, S.,Toda, H.,Okita, K.,Kawai, N.,Mori, M.,Sekiguchi, T.,Is Astronomical Society of Japan 2014 Publications of the Astronomical Society of Japan Vol.66 No.3
Transport at surface nanostructures measured by four-tip STM
A. S. ShalabiShuji Hasegawa,Ichiro Shiraki,Fuhito Tanabe,Rei Hobara 한국물리학회 2002 Current Applied Physics Vol.2 No.6
For in situ measurements of local electrical conductivity of well-dened crystal surfaces in ultrahigh vacuum, we have developedtwo kinds of microscopic four-point probe methods. One is a.four-tip STM prober., in which independently driven four tips ofscanning tunneling microscope (STM) are used for four-point probe conductivity measurements. The probe spacing can be changedfrom 500 nm to 1 mm. The other one is monolithic micro-four-point probes, fabricated on silicon chips, whose probe spacing is xedaround severall m. These probes were installed in scanning-electron-microscopy/electron-diraction chambers, in which the struc-tures of sample surfaces and probe positions were in situ observed. The probes can be positioned precisely on aimed areas on thehanced compared with macroscopic four-point probe method. Then the conduction through the topmost atomic layers (surface-stateconductivity) and inuence of atomic steps upon conductivity could be directly measured. The STM prober is mainly described here.. 2002 Published by Elsevier Science B.V.
Perireceptor Events in Pheromone Perception in Scarab Beetles
W. S. Leal,H. Wojtasek,Jean-Francois Picimbon,S.Kuwahara,H.Saito,M.Hasegawa Korean Society of Applied Entomology 1998 Journal of Asia-Pacific Entomology Vol.1 No.1
Despite the remarkable diversity of the sex pheromone chemistry in scarab beetles, various species utilize a common type of $\gamma$-lactone in their chemical communication channels. These compounds differ primarily in length of the alkenyl side chain and the stereochemistry at the chiral center. Two species, Anomala osakana and Popillia japonica, utilize the opposite enantioners of japonilure as sex pheromones. Each species produces only one of the enantiomers that functions as its own sex pheromone and as a behavioral antagonist to the alloreceiver. Pheromone binding proteins(PBPs) have been characterized, which are present in these and several other scarab species. In most cases there was only one class of PBP, which was expressed in both sexes. A. osakana and P. japonica possess each one single PBP with high homology to each other. Ineach species the same PBP seems to recognize both enantiomers of japonilure, i. e., the pheromonal and the "stop" signals. Based on the N-terminal sequences, the antennae-specific proteins from various other species were highly conserved within the family and showed moderate homology to putative odorant binding protein from Drosophila melanogaster(47%), Lygus lineolaris(45-50%) and the ABPX protein from Bombyx mo가(30-35%). From analysis of extracts of soluble antennal proteins from several species, significant degradation of the $\gamma$-lactones (buibuilactone, japonilure) was detected, essentially in all of them, even in species that do not use these compounds as pheromones. Recently a peculiar pheromone with a diamide moiety [1, 3-dimethly-2, 4-(1H, 3H)-quinazolinedione] was isolated from Phyllopertha diversa, which was rapidly degraded by antennal enzymes from this species. Beetles that utilize lactones as their pheromones possess little or no ability to metabolize this compound. compound.