Random dynamics from a time series of physiological rhythms

A random dynamics with two stochastic terms is modeled based on a time series of physiological experimental data to study synchrony between human heartbeats and pedaling rhythms modulated by music. We observe reproduced time series, rotation numbers, and invariant densities in the model to explain transitory stagnation motion of synchrony in the experiments.\u

Implications of the mild gas motion found with Hitomi in the core of the Perseus cluster

Based mainly on X-ray observations, studies are made on interactions between the intra-cluster medium (ICM) in clusters of galaxies and their member galaxies. Through (magneto)hydrodynamic and gravitational channels, the moving galaxies are expected to drag the ICM around them, and transfer to the ICM some fraction of their dynamical energies on cosmological time scales. This hypothesis is in line with several observations, including the possible cosmological infall of galaxies towards the cluster center, found over redshifts of z~1 to z~0. Further assuming that the energy lost by the galaxies is first converted into ICM turbulence and then dissipated, this picture can explain the subsonic and uniform ICM turbulence, measured with Hitomi in the core region of the Perseus cluster. The scenario may also explain several other unanswered problems regarding clusters of galaxies, including what prevents the ICM from the expected radiative cooling, how the various mass components in nearby clusters have attained different radial distributions, and how a thermal stability is realized between hot and cool ICM components that co-exist around cD galaxies. This view is also considered to pertain to the general scenario of galaxy evolution, including their environmental effects.Comment: 15 pages, 3 figures, accepted for publication in A&

Random dynamical systems modeling for brain wave synchrony

A random dynamical systems model is studied\ud to understand coupled dynamics of auditory area and\ud motor area modulated by external force. We measure transfer\ud entropy of coupled oscillators with the presence of noise\ud to explain results of human brain wave experiments

Genetic analysis of seed dormancy QTL in barley

Seed dormancy in wild barley enables drought escape by preventing germination during the hot summer in and environments. Dormancy in cultivated barley has different effects: it can delay the malting process and/or it can prevent pre-harvest sprouting. Thus, cloning dormancy genes in barley will contribute to understanding the domestication process and it will facilitate optimizing the trait for efficient agronomic and industrial uses. Rates of seed germination were used to evaluate dormancy on physiologically matured grain samples that were dried and stored frozen until use. With this phenotypic scoring procedure, many genetic factors controlling seed dormancy has been reported as quantitative trait loci (QTL). Of these QTL, one at the centrometic region of chromosome 5H (Qsd1) has been most frequently identified and shows the largest effect across mapping populations. We also identified this QTL using the EST map based on Haruna Nijo (H. vulgare ssp. vulgare) crossed with wild barley H602 (H. vulgare ssp. spontaneum). We have derived both doubled haploid and recombinant chromosome substitution lines (RCSLs) from this cross. At least four QTLs are segregating in this germplasm. RCSLs having only the Qsd1 segment of wild barley in a Haruna Nijo genetic background were identified and 910 BC(3)F(2) plants were scored for dormancy. In these lines, segregation for dormancy fit a mono-factorial ratio. These germplasm resources are appropriate for map based cloning of Qsd1. Strategies for cloning Qsd1 with these resources are discussed

Areal distribution of water-insoluble particles in snow covers of the central mountainous area, Japan

The vertical snow samples collected from 6 locations (Iou-zen: 800m A.M.S.L; the nearest site from the Sea of Japan, Kongoudou-zan: 1300m, Nishi-Hodaka-Dake: 2200m; the Northern Japan Alps, Hachimori-yama: 2100m, Kiriga-mine: 2000m, Yatsuga-take: 2200m; the most inlying site) in the central mountainous area, Japan, during early spring season 2004, were analyzed for size-separated concentrations of water-insoluble particles in snow layers to investigation of long-range transportation of chemical substances from the Asian continent to high mountainous areas in Japan. Most of particles are less than 30 μm in diameter, the greater part of particles observed at the 6 locations were considered to be transported from the Asian continent sources as Asian dust (KOSA). The variation patterns of the vertical profiles of particle concentrations in snow layers were corresponding among each location. The concentrations of particles with less than 30 μm was gradually increased with increasing distance from the Sea of Japan to the Japan Alps, although, sharply-decreased at 3 sites located the monsoon-leeward of the Japan Alps, suggesting that the particles transported with monsoon were gradually removed from air and deposited in snow cover when the air parcel pass through the Japan Alps

Testing the Littlest Higgs Model with T-parity at the Large Hadron Collider

In the framework of the littlest Higgs model with T-parity (LHT), we study the production processes of T-even (T_+) and T-odd (T_-) partners of the top quark at the Large Hadron Collider (LHC). We show that the signal events can be distinguished from the standard-model backgrounds, and that information about mass and mixing parameters of the top partners can be measured with relatively good accuracies. With the measurements of these parameters, we show that a non-trivial test of the LHT can be performed. We also discuss a possibility to reconstruct the thermal relic density of the lightest T-odd particle A_H using the LHC results, and show that the scenario where A_H becomes dark matter may be checked.Comment: 26 pages, 6 figure

Kyphectomy for severe kyphosis with pyogenic spondylitis associated with myelomeningocele: a case report

A 32-year-old woman was referred to our hospital for a refractory ulcer on her back. She had a history of myelomeningocele with spina bifida that was treated surgically at birth. The ulcer was located at the apex of the kyphosis. An X-ray film revealed a kyphosis of 154° between L1 and 3 and a scoliosis of 60° between T11 and L5. Computed tomography, magnetic resonance imaging and laboratory data indicated the presence of a pyogenic spondylitis at L2/3. To correct the kyphosis and remove the infected vertebrae together with the skin ulcer, kyphectomy was performed. Pedicle screws were inserted from T8 to T12 and from L4 to S1. The dural sac was transected and ligated at L2, followed by total kyphectomy of the L1-L3 vertebrae. The spinal column was reconstructed by approximating the ventral wall of the T12 vertebral body and the cranial endplate of the L4 vertebra. Postoperatively, the kyphosis was corrected to 61° and the scoliosis was corrected to 22°. In the present case, we treated the skin ulcer and pyogenic spondylitis successfully by kyphectomy, thereby, preventing recurrence of the ulcer and infection, and simultaneously obtaining sufficient correction of the spinal deformity