M. Hirayama

Publication List Details

Period

1958 - 2009

Number

41

Co-Authors

V. M. Kaspi (2007)

Ipac Caltech, V. M. Kaspi, M. Tavani, F. Nagase, M. Hirayama, M. Hoshino, ...

We report on results of X-ray observations of the unique radio pulsar/Be star binary PSR B1259\Gamma63, obtained using the ASCA satellite two weeks before, during, and two weeks after the...

Monte-Carlo Simulator and Ancillary Response Generator of Suzaku XRT/XIS System for Spatially Extended Source Analysis (2006)

Ishisaki, Y., Maeda, Y., Fujimoto, R., Ozaki, M., Ebisawa, K., Takahashi, T., ...

We have developed a framework for the Monte-Carlo simulation of the X-Ray Telescopes (XRT) and the X-ray Imaging Spectrometers (XIS) onboard Suzaku, mainly for the scientific analysis of spatially...

Decomposition of meron configuration of SU(2) gauge field (2003)

Hirayama, M., Yamashita, J.

For the meron configuration of the SU(2) gauge field in the four dimensional Minkowskii spacetime, the decomposition into an isovector field $\bn$, isoscalar fields $\rho$ and $\sigma$, and a U(1)...

A Class of Exact Solutions of the Faddeev Model (2003)

Hirayama, M.

A class of exact solutions of the Faddeev model, that is, the modified SO(3) nonlinear sigma model with the Skyrme term, is obtained in the four dimensional Minkowskian spacetime. The solutions are...

Elliptic solutions of the Skyrme model (2003)

Hirayama, M., Yamashita, J.

A class of exact solutions of the Skyrme model are obtained. They are described by the Weierstrass $\wp$-function or the Jacobi elliptic function. They are not solitonic but of wave character. They...

Class of exact solutions of the Skyrme and the Faddeev model (2002)

Hirayama, M., Yamashita, J.

Class of exact solutions of the Skyrme and the Faddeev model are presented. In contrast to previously found solutions, they are produced by the interplay of the two terms in the Lagrangians of the...

ASCA Observations of Temperature Structure and Metal Distribution in the Perseus Cluster of Galaxies (2001)

Ezawa, H., Yamasaki, N. Y., Ohashi, T., Fukazawa, Y., Hirayama, M., Honda, H., ...

Large-scale distributions of hot-gas temperature and Fe abundance in the Perseus cluster have been studied with multi-pointing observations by the GIS instrument on ASCA. Within a radius of 20' from...

ASCA Detection of Pulsed X-ray Emission from PSR J0631+1036 (2001)

Torii, Ken'ichi, Saito, Y., Nagase, F., Yamagami, T., Kamae, T., Hirayama, M., ...

ASCA's long look at the 288 millisecond radio pulsar, PSR J0631+1036, reveals coherent X-ray pulsation from this source for the first time. The source was first detected in the serendipitous Einstein...

Non-Abelian Stokes Theorem for Wilson Loops Associated with General Gauge Groups (1999)

Hirayama, M., Ueno, M.

A formula constituting the non-Abelian Stokes theorem for general semi-simple compact gauge groups is presented. The formula involves a path integral over a group space and is applicable to Wilson...

X-Ray/Gamma-Ray Observations of the PSR B1259-63/SS 2883 system near Apastron (1999)

Hirayama, M., Cominsky, L. R., Kaspi, V. M., Nagase, F., Tavani, M., Kawai, N., ...

We report the results from X-ray and hard X-ray observations of the PSR B1259-63/SS 2883 system with the ASCA and CGRO satellites, performed between 1995 February and 1996 January when the pulsar was...

Beam Test of Gamma-ray Large Area Space Telescope Components (1999)

Atwood, W. B., Ritz, S., Anthony, P., Bloom, E. D., Bosted, P. E., Bourotte, J., ...

A beam test of GLAST (Gamma-ray Large Area Space Telescope) components was performed at the Stanford Linear Accelerator Center in October, 1997. These beam test components were simple versions of the...

The Silicon Tracker/Converter for the Gamma-Ray Large Area Space Telescope (1999)

W.B. Atwood, J.A. Hernando, M. Hirayama, R.P. Johnson, W. Kröger, W. Krok Ger, ...

The Silicon Tracker/Converter of the Gamma-ray Large Area Space Telescope (GLAST) will have an active area of 80 m#, representing one of the largest planned applications of the silicon-strip detector...

Consistency Conditions of the Faddeev-Niemi-Periwal Ansatz for the SU(N) Gauge Field (1998)

Hirayama, M., Kanno, M., Ueno, M., Yamakoshi, H.

The consistency condition of the Faddeev-Niemi ansatz for the gauge-fixed massless SU(2) gauge field is discussed. The generality of the ansatz is demonstrated by obtaining a sufficient condition for...

Non-Abelian Stokes Theorem for Loop Variables Associated with Nontrivial Loops (1998)

Hirayama, M., Kanno, M., Ueno, M., Yamakoshi, H.

The non-Abelian Stokes theorem for loop variables associated with nontrivial loops (knots and links) is derived. It is shown that a loop variable is in general different from unity even if the field...

Stokes Theorem for Loop Variables of Non-Abelian Gauge Field (1997)

Hirayama, M., Matsubara, S.

A simple analytic proof of the formula known as the non-Abelian Stokes theorem is given. It is explicitly shown that the consistency of the formula is guaranteed by the Bianchi identity for the gauge...

The Structure of the X-Ray Emitting Gas in the Hydra-A Cluster of Galaxies (1997)

Ikebe, Y., Makishima, K., Ezawa, H., Fukazawa, Y., Hirayama, M., Honda, H., ...

The temperature and abundance structure in the intracluster medium (ICM) of the Hydra-A cluster of galaxies is studied with ASCA and ROSAT. The effect of the large extended outskirts in the...

Cytokine-enhanced mixed lymphocyte reaction (MLR) in cord blood

Umemoto, M, Azuma, E, Hirayama, M, Nagai, M, Hiratake, S, Qi, J, ...

Although in cord blood (CB) transplantation graft-versus-host disease (GVHD) is reported to be less severe, GVHD may occur even in patients with HLA-identical sibling donors. This result shows that...

Differential responsiveness of cord and adult blood monocytes to hepatocyte growth factor

Jiang, Qi, Azuma, E, Tanaka, M, Kobayashi, M, Hirayama, M, Kumamoto, T, ...

Monocytes as antigen-presenting cells play an important role in host defence. There are several cytokines affecting monocyte function. We demonstrate that both adult and cord blood monocytes...

IgG1 anti-P2 as a marker of response to interferon in patients with chronic hepatitis C

Hirayama, M, Maruyama, T, Mitsui, H, Maekawa, H, Yamada, H, Hashimoto, N, ...

To study the relations of antibody production to long-term outcomes after interferon (IFN) treatment in patients with chronic hepatitis C (CH-C), we used ELISA to measure the levels of antibodies...

An axonal form of Charcot-Marie-Tooth disease showing distinctive features in association with mutations in the peripheral myelin protein zero gene (Thr124Met or Asp75Val)

Misu, K, Yoshihara, T, Shikama, Y, Awaki, E, Yamamoto, M, Hattori, N, ...

OBJECTIVES AND METHODS—Seven families were studied with an axonal form of Charcot-Marie-Tooth disease (CMT) associated with mutations in the peripheral myelin protein zero (MPZ) gene—Thr124Met or...

Cardiac 123I-meta-iodobenzylguanidine (MIBG) uptake in dementia with Lewy bodies: comparison with Alzheimer's disease

Watanabe, H, Ieda, T, Katayama, T, Takeda, A, Aiba, I, Doyu, M, ...

Cardiac 123I-meta-iodobenzylguanidine (MIBG) uptake was measured in 11 patients with dementia with Lewy bodies (DLB), 10 patients with Alzheimer's disease (AD), and 10 age matched control subjects....

Postgastrectomy polyneuropathy with thiamine deficiency

Koike, H, Misu, K, Hattori, N, Ito, S, Ichimura, M, Ito, H, ...

OBJECTIVE—Polyneuropathy has been reported after gastrectomy performed to treat various lesions. Although thiamine deficiency is a possible cause of this neuropathy, the pathogenesis still remains...

Onset age and severity of motor impairment are associated with reduction of myocardial 123I-MIBG uptake in Parkinson's disease

Hamada, K, Hirayama, M, Watanabe, H, Kobayashi, R, Ito, H, Ieda, T, ...

Objectives: To elucidate the factors associated with severity of cardiac sympathetic nerve involvement in idiopathic Parkinson's disease (PD).

Multiple regional 1H-MR spectroscopy in multiple system atrophy: NAA/Cr reduction in pontine base as a valuable diagnostic marker

Watanabe, H, Fukatsu, H, Katsuno, M, Sugiura, M, Hamada, K, Okada, Y, ...

Objective: We performed 1H-MR spectroscopy (1H-MRS) on multiple brain regions to determine the metabolite pattern and diagnostic utility of 1H-MRS in multiple system atrophy (MSA).

Progression and prognosis in pure autonomic failure (PAF): comparison with multiple system atrophy

Mabuchi, N, Hirayama, M, Koike, Y, Watanabe, H, Ito, H, Kobayashi, R, ...

Objective: To clarify the progression of autonomic symptoms and functional deterioration in pure autonomic failure (PAF), particularly in comparison with multiple system atrophy (MSA).

Age associated axonal features in HNPP with 17p11.2 deletion in Japan

Koike, H, Hirayama, M, Yamamoto, M, Ito, H, Hattori, N, Umehara, F, ...

Objective: To clarify age related changes in the clinicopathological features of hereditary neuropathy with liability to pressure palsy (HNPP) in Japanese patients with deletion of 17p11.2,...

Poliomyelitis in Japan during the period 1962-68 after the introduction of mass vaccination with Sabin vaccine

Takatsu, T., Tagaya, I., Hirayama, M.

After the mass vaccination of children of susceptible age groups in Japan in 1961, the incidence of poliomyelitis decreased markedly. From 1962 to 1968 a total of 659 paralytic cases were officially...