80 Result(s)

Article

Heavy Fermion Metal CeB₆ in SubTHz and THz Range: The Electron Spin Resonance and Neutron Scattering Studies

Cerium hexaboride attracts attention of solid-state community for almost 50 years. Nowadays, this material is considered as a unique example of a system with orbital ordering resulting in formation of low-temp...

A. V. Semeno, S. Okubo, H. Ohta, S. V. Demishev in Applied Magnetic Resonance (2021)

Article

Developments of Multi-extreme High Field ESR in Kobe

Recent developments of “multi-extreme” high magnetic field electron spin resonance (ESR) in Kobe will be reviewed. Our high magnetic field ESR covers the frequency region between 0.03 and 7 THz and the tempera...

H. Ohta, S. Okubo, E. Ohmichi, T. Sakurai… in Journal of Low Temperature Physics (2013)

Article

Norepinephrine in the brain is associated with aversion to financial loss

H Takahashi, S Fujie, C Camerer, R Arakawa, H Takano, F Kodaka… in Molecular Psychiatry (2013)

Article

Estimating Abrasivity of Rock by Laboratory and In Situ Tests

The degree to which a rock abrades another rock is called its “abrasivity”. Laboratory tests of abrasivity can be broadly divided into four kinds: drilling, rubbing, turning-operation and tumbling tests. The p...

S. Okubo, K. Fukui, Y. Nishimatsu in Rock Mechanics and Rock Engineering (2011)

Article

High Field ESR Measurements of S=1/2 Quasi One-Dimensional Antiferromagnet Cu₃Mo₂O₉

S=1/2 one-dimensional chain and dimer system Cu₃Mo₂O₉, in which the super-exchange network forms one-dimensional corner-sharing tetrahedoron of Cu²⁺ ion, has been investigated by high field ESR measurements using...

S. Okubo, T. Yoshida, M. Fujisawa, T. Sakurai… in Journal of Low Temperature Physics (2010)

Article

Photoluminescence Measurement of Er,O-Codoped GaAs Under a Pulsed Magnetic Field up to 60 T

We have performed photoluminescence (PL) measurements on magnetic semiconductor GaAs:Er,O under pulsed magnetic fields up to 60 T at 4.2 K. We have succeeded in observing the Zeeman effect of the ⁴ ...

H. Ohta, O. Portugall, N. Ubrig, M. Fujisawa… in Journal of Low Temperature Physics (2010)

Article

Development of Multi-extreme ESR Measurement System in Kobe

Development of multi-extreme electron spin resonance (ESR) measurement system is in progress in Kobe. We have installed the pulsed magnetic field up to 55 T and our high field ESR system can cover the frequenc...

H. Ohta, E. Ohmichi, S. Okubo, T. Sakurai… in Journal of Low Temperature Physics (2010)

Article

Development and applications of high-frequency ESR up to 55 T

A multiextreme (high-field, low-temperature, high-pressure and nanoscale) electron spin resonance (ESR) measurement system is under development in Kobe. In this connection, our recent development is introduced...

Hitoshi Ohta, S. Okubo, N. Souda, M. Tomoo, T. Sakurai… in Applied Magnetic Resonance (2009)

Article

ESR probing of quantum critical phenomena in doped S = 1/2 AF quantum spin chain

The results of high-frequency (60–315 GHz) electron spin resonance (ESR) studies of CuGeO₃ single crystals containing 0.9% Mn impurity are reported. The quantitative ESR line shape analysis shows that the low-tem...

S. V. Demishev, A. V. Semeno, N. E. Sluchanko, N. A. Samarin… in Applied Magnetic Resonance (2009)

Article

High-frequency study of the orbital ordering resonance in the strongly correlated heavy fermion metal CeB₆

A recently discovered magnetic resonance in the orbitally ordered phase of CeB₆ (orbital ordering resonance) is studied in a wide frequency range v = 44–360 GHz. The g-factor for this resonance was found to incre...

S. V. Demishev, A. V. Semeno, H. Ohta, S. Okubo… in Applied Magnetic Resonance (2009)

Article

New Magneto-Optical Effect in Co-Doped CuGeO₃

We report the anomalous effect of the polarization dependence of electron paramagnetic resonance absorption in CuGeO₃ doped with 2% of Co. While the resonance line of Cu²⁺ chains is independent of the microwave p...

A. V. Semeno, H. Ohta, S. Okubo, N. E. Sluchanko… in Applied Magnetic Resonance (2008)

Article

Anomalous polarization characteristics of magnetic resonance in a quasi-one-dimensional CuGeO₃: Co magnet

Do** of CuGeO₃ by 2% Co was found to cause a new magnetic resonance, which has anomalous polarization characteristics. In the Faraday geometry, where a microwave field B _ω is directed along cert...

S. V. Demishev, A. V. Semeno, H. Ohta, S. Okubo… in Physics of the Solid State (2007)

Article

Quantum Criticality and Collective Effects in Low-Dimensional Magnet CuGeO₃:Fe Probed by High Frequency EPR

For CuGeO₃ single crystals doped with 1% of Fe, the quantum critical behavior in a wide temperature range 1–40 K is reported. The critical exponents for susceptibility along different crystallographic axes are de...

S. V. Demishev, A. V. Semeno, A. A. Pronin… in Journal of Superconductivity and Novel Mag… (2007)

Article

New polarization effect and collective excitation in S = 1/2 quasi-one-dimensional antiferromagnetic quantum spin chain

Anomalous polarization characteristics of magnetic resonance in CuGeO₃ doped with 2% Co impurity are reported. For the Faraday geometry, this mode is damped for the microwave field B _ω aligned alo...

S. V. Demishev, A. V. Semeno, H. Ohta, S. Okubo, I. E. Tarasenko… in JETP Letters (2006)

Article

An Analytical Investigation of a Variable-Compliance-type Constitutive Equation

A constitutive equation is proposed in which the compliance is assumed to monotonically increase as a load is applied. The primary feature of the constitutive equation is that the equation can be applied to va...

S. Okubo, K. Fukui in Rock Mechanics and Rock Engineering (2006)

Article

Some Attempts for Estimating Rock Strength and Rock Mass Classification from Cutting Force and Investigation of Optimum Operation of Tunnel Boring Machines

Tunnel face and wall collapse are common during excavations performed by tunnel boring machines (TBMs) due to the difficulty of correctly identifying the properties of the excavated rock. This identification, ...

K. Fukui, S. Okubo in Rock Mechanics and Rock Engineering (2006)

Article

Effect of vitamin C on common cold: randomized controlled trial

To investigate the relationship between the common cold and vitamin C supplementation.

S Sasazuki, S Sasaki, Y Tsubono, S Okubo… in European Journal of Clinical Nutrition (2006)

Article

Electromagnetic Radiation from Rock During Uniaxial Compression Testing: The Effects of Rock Characteristics and Test Conditions

K. Fukui, S. Okubo, T. Terashima in Rock Mechanics and Rock Engineering (2005)

Article

Microwave EPR spectroscopy of cobalt-doped germanium cuprate

Resonance magnetoabsorption spectra of CuGeO₃ single crystals containing 2% Co impurity have been studied in the frequency range 60–360 GHz in magnetic fields of up to 16 T and in the temperature interval 2–60 K ...

S. V. Demishev, A. V. Semeno, N. E. Sluchanko, N. A. Samarin… in Physics of the Solid State (2004)

Article

Control of nonlinear, continuous, dynamic systems via finite elements, sensitivity analysis, and optimization

A general methodology to design open loop controllers for nonlinear, dynamic, continuous systems is presented and applied to control a single flexible link (SFL). In this application, the partial differential ...

S. Okubo, D.A. Tortorelli in Structural and Multidisciplinary Optimization (2004)