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Search Results: 1 - 10 of 139185 matches for " K. Koike "
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Generation Structure and Proton Decay Problem
K. Koike
Physics , 2001, DOI: 10.1143/PTP.106.963
Abstract: Possible generation structure is investigated. We considere alternative possibility of combination of leptons and quarks to compose each generation, where the combination of $(\nu_{\tau},{\tau})$ and $(u,d)$ compose a generation. Our model exhibits the hierarcy structure after sea-saw mechanism provived that possible existence of realistic right-handed neutrinos are taken into account. Then, in the GUTs model based on our scheme, possible inter-generation properties are examined together with the classification of gauge bosons. It is shown that if our scheme is realized, the proton decay exhibits different mode from ordinary one.
On the Family of Pentagonal curves of genus 6 and associated modular forms on the Ball
K. Koike
Mathematics , 2000,
Abstract: In this article we study the inverse of the period map for the family $\mathcal{F}$ of complex algebraic curves of genus 6 equipped with an automorphism of order 5. This is a family with 2 parameters, and is fibred over a certain type of Del Pezzo surace. The period satisfies the hypergeometric differential equation for Appell's $F_1({3/5},{3/5},{2/5},{6/5})$ of two variables after a certain normalization of the variable parameter. This differential equation and the family $\mathcal{F}$ are studied by G. Shimura (1964), T. Terada (1983, 1985), P. Deligne - G.D. Mostow (1986) and T. Yamazaki- M. Yoshida(1984). Recently M. Yoshida presented a new approch using the concept of configration space. Based on their results we show the representation of the inverse of the period map in terms of Riemann theta constants. This is the first variant of the work of H. Shiga (1981) and K. Matsumoto (1989, 2000) to the co-compact case.
Q^2-Evolution of Nucleon's Chiral-Odd Twist-3 Structure Function: h_L(x,Q^2)
Y. Koike,K. Tanaka
Physics , 1994, DOI: 10.1103/PhysRevD.51.6125
Abstract: We investigate the $Q^{2}$-evolution of the chiral-odd spin-dependent parton distribution $h_{L}(x, Q^{2})$ relevant for the polarized Drell-Yan processes. The results are obtained in the leading logarithmic order in the framework of the renormalization group and the standard QCD perturbation theory. We calculate the anomalous dimension matrix for the twist-3 operators for $h_{L}$ in the one-loop order. The operator mixing among the relevant twist-3 operators including the operators proportional to the QCD equations of motion is treated properly in a consistent scheme. Implications for future experiments are also discussed.
Relation between shrinkage effect and compression of rotational spectrum in $^7_Λ$Li hypernucleus
K. Hagino,T. Koike
Physics , 2011, DOI: 10.1103/PhysRevC.84.064325
Abstract: It has been shown experimentally that the $^6$Li nucleus shrinks by adding a $\Lambda$ particle while its spectrum is also compressed. We discuss the compatibility of these two effects, contrasting also with a relation between the shrinkage effect and the stability of the spectrum in the $^9_\Lambda$Be hypernucleus. To this end, we employ two-body $d$-$^5_\Lambda$He and $\alpha$-$^5_\Lambda$He cluster models for the $^7_\Lambda$Li and $^9_\Lambda$Be hypernuclei, respectively. We first argue that a Gaussian-like interaction between two clusters leads to a stabilization of the spectrum against an addition of a $\Lambda$ particle, even though the intercluster distance is reduced. In the case of $^7_\Lambda$Li, the spin-orbit interaction between the intercluster motion and the deuteron spin has to be considered also. We show that the shrinkage effect makes the expectation value of the spin-orbit potential larger, lowering the excitation energy for the $^6$Li($3^+)\otimes \Lambda(1/2^+)$ level.
Thermoluminescence of Simulated Interstellar Matter after Gamma-ray Irradiation
K. Koike,M. Nakagawa,C. Koike,M. Okada,H. Chihara
Physics , 2002,
Abstract: Interstellar matter is known to be strongly irradiated by radiation and several types of cosmic ray particles. Simulated interstellar matter, such as forsterite $\rm Mg_{2}SiO_{4}$, enstatite $\rm MgSiO_{3}$ and magnesite $\rm MgCO_{3}$ has been irradiated with the $\rm ^{60}Co$ gamma-rays in liquid nitrogen, and also irradiated with fast neutrons at 10 K and 70 K by making use of the low-temperature irradiation facility of Kyoto University Reactor (KUR-LTL. Maximum fast neutron dose is $10^{17}n_f{\rm /cm^{2}}$). After irradiation, samples are stored in liquid nitrogen for several months to allow the decay of induced radioactivity. We measured the luminescence spectra of the gamma ray irradiated samples during warming to 370K using a spectrophotometer. For the forsterite and magnesite, the spectra exhibit a rather intense peak at about 645 -- 655 nm and 660 nm respectively, whereas luminescence scarcely appeared in olivine sample. The spectra of forsterite is very similar to the ERE of the Red Rectangle.
Affect-Loaded Questions in Japanese Storytelling: An Analysis of Grammar, Prosody, and Body Movements of Story Recipients’ Questions  [PDF]
Chisato Koike
Open Journal of Modern Linguistics (OJML) , 2015, DOI: 10.4236/ojml.2015.55043
Abstract: The present study explores affective stance in conversational storytelling by investigating the ways in which unknowing story recipients display affective stances toward a teller’s story through questions that deploy multimodal resources. The data are based on videotaped natural face-to-face conversations between native Japanese speakers. While unknowing story recipients ask questions of the storyteller only to elicit factual information (“neutral questions”), they also ask questions layered with affect (“affect-loaded questions”). Building on studies on affect and stance, assessment, questions, and alignment and affiliation in storytelling, I demonstrate how unknowing story recipients ask affect-loaded questions to elicit and display affective stances toward story contents by exploiting linguistic and non-linguistic resources. First, I explicate how unknowing story recipients employ not only linguistic devices (e.g., emotion words, wh-questions, and deictic expressions such as sonna “like that”), but also prosody, facial expressions, body movements, and pre-/concurrent-laughter in order to load questions with affective stance that display, for example, disgust, humor, sarcasm, criticism, or surprise. Secondly, I show how unknowing story recipients use rhetorical questions to express their affect (rather than to elicit information from the storyteller). Thirdly, I demonstrate how affiliation of affective stance between storyteller and unknowing story recipients influences the trajectory of storytelling and how the participants negotiate their affective stances. This study sheds light on the interactional process of how participants in talk-in-interaction display affective stance through a range of multimodal resources, by examining how unknowing story recipients ask affect-loaded questions of the storyteller. It illuminates the social practice of story recipients’ active participation in storytelling activity that is embedded in social interaction, through their use of questions that dynamically co-construct and negotiate affective stance.
Shape of Lambda hypernuclei in (beta,gamma) deformation plane
Myaing Thi Win,K. Hagino,T. Koike
Physics , 2010, DOI: 10.1103/PhysRevC.83.014301
Abstract: We study the shape of $\Lambda$ hypernuclei in the full ($\beta,\gamma$) deformation plane, including both axially symmetric and triaxial quadrupole deformations. To this end, we use the constrained Skyrme Hartree-Fock+BCS method on the three-dimensional Cartesian mesh. The potential energy surface is analyzed for carbon hypernuclei as well as for sd-shell hypernuclei such as $^{27,29}_{\Lambda}$Si and $^{25,27}_{\Lambda}$Mg. We show that the potential energy surface in the ($\beta,\gamma$) plane is similar to each other between the hypernuclei and the corresponding core nuclei, although the addition of $\Lambda$ hyperon makes the energy surface somewhat softer along the $\gamma$ direction. Our calculation implies that the energy of the $\gamma$ vibration for $^{25,27}_{\Lambda}$Mg nuclei is lowered by about 0.15 MeV with respect to that of $^{24,26}$Mg nuclei.
Renormalization of Chiral-Even Twist-3 Light-cone Wave Functions for Vector Mesons in QCD
Y. Koike,N. Nishiyama,K. Tanaka
Physics , 1998, DOI: 10.1016/S0370-2693(98)00901-0
Abstract: We present the one-loop anomalous dimension matrices for the chiral-even twist-3 (nonsinglet) conformal operators, which govern the scale-dependence of the vector meson light-cone wave functions through the conformal expansion. It is clarified that the constraints from the charge-conjugation invariance and the chirality conservation allow only one independent anomalous dimension matrix for each conformal spin.
Expression of CD133 and Extracellular Matrix Molecules in Malignant Brain Tumors  [PDF]
Seiichi Yoshida, Toshiro Koike
Neuroscience & Medicine (NM) , 2011, DOI: 10.4236/nm.2011.24052
Abstract: Background: CD133 could be characterized as a “stem-like” cell subpopulation and an invasive tumor phenotype. The objectives of this study were to investigate the relationship of CD133 and other remodeling factors such as matrix metalloproteinases (MMP) in the brain tumors. Methods: Tumors from 13 patients with brain tumors (8 lung cancer metastasis, 3 breast cancer metastasis, 2 gliomas) were studied to investigate the expression-patterns of CD133, EGFR, MT1-MMP, and MMP7 using the immunostaining and RT-PCR analysis. Results: EGFR immunostaining was detected in 75% (6/8) and 67% (1/3) of brain metastasis from lung adenocarcinoma and breast cancer, respectively. MT1-MMP immunostaining was also detected in 73% (8/11) of these brain metastasis. CD133 was not detected in these 13 patients. EGFR immunostaining was detected in 75% (6/8) and 67% (1/3) of brain metastasis from lung adenocarcinoma and breast cancer, respectively. MT1-MMP immunostaining was also detected in 73% (8/11) of these brain metastasis. CD133 was not detected in these 13 patients. Conclusions: The expression of CD133 indicates a marker for brain tumor initiating.
Influence of Fine Zirconia Particle Shot Peening on Sliding Wear of Zirconia-Silicon Carbide Composites  [PDF]
Hitonobu Koike, Koji Takahashi
Journal of Surface Engineered Materials and Advanced Technology (JSEMAT) , 2017, DOI: 10.4236/jsemat.2017.72004
Abstract: In this paper, the sliding contact fatigue wear performance of shot-peened zirconia-silicon carbide composite (ZrO2/SiC) plates in contact with silicon nitride balls under compressive residual stress in dry conditions was investigated in order to improve the wear resistance of ZrO2/SiC friction parts. The wear resistance of ZrO2/SiC plates after shot peening was higher than that of plates not treated with shot peening in sliding wear testing under Hertziancontact. Due to fine Zirconia particle shot peening, the tetragonal phase crystal structure in ZrO2 in the near-surface of ZrO2/SiC plates was changed, and 1100 MPa compressive residual stress could be introduced into the near-surface layer of ZrO2/SiC plates. The compressive residual stress was determined to be the main factor in the improvement of the sliding wear resistance of ZrO2/SiC plates.
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