A5026828162- Quasicrystal Structures and Properties
- Magnetic Field Sensors Techniques
- X-ray Diffraction in Crystallography
- Mineralogy and Gemology Studies
- Advanced MRI Techniques and Applications
- Functional Brain Connectivity Studies
- Atomic and Subatomic Physics Research
- EEG and Brain-Computer Interfaces
- Characterization and Applications of Magnetic Nanoparticles
- Geomagnetism and Paleomagnetism Studies
- Microstructure and mechanical properties
- Muon and positron interactions and applications
- Magnetic and transport properties of perovskites and related materials
- Inertial Sensor and Navigation
- Black Holes and Theoretical Physics
- Non-Destructive Testing Techniques
- Nuclear Physics and Applications
- Intermetallics and Advanced Alloy Properties
- Advancements in Battery Materials
- Advanced Mathematical Theories and Applications
- Nanocluster Synthesis and Applications
- Chemical Synthesis and Characterization
- Minerals Flotation and Separation Techniques
- Boron and Carbon Nanomaterials Research
- Advanced Battery Materials and Technologies
TDK (Japan)
2018-2025
Toshiba (Japan)
2019
Tokyo University of Science
2003-2004
Tokyo Gakugei University
2002
Toyo University
1991-1998
The University of Tokyo
1993
We developed a measurement system capable of detecting magnetic responses in various material samples. The utilizes an excitation coil to apply alternating field within the frequency range 1–10 kHz. generated samples was detected using highly sensitive magnetoresistive sensor. demonstrated detection lower limit sub-pT for fields arising from such as eddy currents and magnetization changes. dependence signal intensities correlated well with physical mechanisms underlying responses. Notably,...
The electron transport properties of the thermodynamically stable Al68Cu17Ru15 quasicrystal have been studied through measurements electronic specific heat coefficient and temperature dependence electrical resistivity in range 4.2-300 K. full-width at half maximum for strongest X-ray diffraction line (100000) is reduced to be less than 0.15 nm-1 either by remelting ingot with subsequent furnace cooling or annealing melt-spun ribbon 850 degrees C 24 hours. An apparent improvement...
Since 3D-Flash memory took over for 2D-Flash memory, chip capacity has continuously improved [1-3]. In the era, 2b/cell (MLC) offered higher performance and reliability, while a 3b/cell (TLC) lowest cost. Thanks to larger feature size, 3D Flash cell reliability is much better than that of 2D. As result, TLC became mainstream non-volatile since it satisfies most market requirements in both reliability. To meet growing demand lower cost, 4b/cell (QLC) 96-WL-layer technology presented. It...
Biomagnetic field measurement is a promising tool for the investigation of electrical activities in living body. Room temperature (RT) magnetic sensors with an improved resolution such as magnetoresistance (MR) devices have been recently employed detection weak fields, which were earlier detected solely using superconducting interference device sensors. The position, orientation, and sensitivity each sensor array must be precisely determined accurate source analysis. We proposed calibration...
In previous magnetocardiography studies, magnetocardiograms (MCGs) have been obtained using superconducting quantum interference device (SQUID) systems. SQUID is the most sensitive instrument for measuring low-frequency magnetic fields, but it requires liquid helium cooling, so operating costs are high. contrast, magnetoresistive (MR) magnetometers function by detecting change in resistance, caused an external field, and much lower costs. This study was aimed to evaluate feasibility of MR...
Abstract Two kinds of high-order periodic approximant phase a decagonal quasi-crystal have been found to form in slowly cooled Al70Ni15Co15 alloy. For both them, the two-dimensional symmetry, 10 mm, breaks down one its subgroups, 2 quasi-periodic plane phase. One them has periodicity along two mutually perpendicular twofold axes with periods, 3·8 nm and 5·2 nm. The other is period 6·2 nm, it apparently maintains quasi-periodicity axis within experimental resolution. Structural relations...
Magnetic particle imaging (MPI) demands high sensitivity to be operable under low excitation fields as alternative countermeasure for specific absorption rate (SAR) and magnetostimulation effects. Owing capability of magnetoresistive (MR) sensors unidirectionally detect sub-pT signal, we built a prototype brain MPI scanner by using MR sensor array. The arrays were <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math...
The positron lifetime measurements for a recently discovered binary icosahedral quasicrystal $({\mathrm{Cd}}_{84.6}{\mathrm{Yb}}_{15.4})$ and its cubic approximant $({\mathrm{Cd}}_{6}\mathrm{Yb})$ have shown that the spectra in both alloys are composed of single component with $230\ifmmode\pm\else\textpm\fi{}3 \mathrm{ps}$ $234\ifmmode\pm\else\textpm\fi{}3 approximant; these values being close to reported (250 ps) positrons trapped lattice vacancies crystalline Cd. Based on atomic structure...
Previously, we showed that the icosahedral quasicrystal ${\mathrm{Cd}}_{5.7}\mathrm{Yb}$ possesses similar structural vacancies to those in its cubic $1∕1$-approximant ${\mathrm{Cd}}_{6}\mathrm{Yb}$ by positron lifetime measurements [K. Sato, H. Uchiyama, K. Arinuma, I. Kanazawa, R. Tamura, T. Shibuya, and S. Takeuchi, Phys. Rev. B 66, 052201 (2002)]. In present paper, local chemical environment around is specifically investigated two-detector coincident Doppler broadening spectroscopy....
An adjustable helmet-style magnetoresistive (MR) sensor array with room-temperature magnetic flux sensors was developed to demonstrate the simultaneous multipoint measurement of somatosensory evoked field (SEF). The positions on can be individually adjusted in radial direction, making it precisely fit head each subject. SEF measured three healthy subjects using an 30-channel MR placed left hemisphere median nerve stimulation right wrist and averaged over 8,000 measurements. M20 component...
An adjustable helmet-style magnetoresistive (MR) sensor array with room-temperature magnetic flux sensors was developed to demonstrate the simultaneous multipoint measurement of somatosensory evoked field (SEF). Utilizing extended length, we designed permit individual radial adjustment each sensor, thereby achieving a precise fit varied head geometries different subjects. Furthermore, geometry precisely adjusted for subject quickly obtained by calibration. The SEF measured in three healthy...
<p>An adjustable helmet-style magnetoresistive (MR) sensor array, a room-temperature magnetic flux sensor, was developed to demonstrate simultaneous multipoint measurement of the somatosensory evoked field (SEF). The SEF measured in three healthy subjects using an array 30-channel MR sensors placed on left hemisphere head with median nerve stimulation right wrist and averaged over 8,000 measurements. An M20 component (maximum amplitude 725 ± 257 fT, peak latency 20.5 0.45 ms),...
To realize clinical magnetic particle imaging (MPI), scanner sensitivity must be designed to recognize nanotracers within safe dosage range. As zero-dimensional MPI scanner, spectroscopy (MPS) is often used initially characterize complex dynamic of the tracers by applying a sinusoidal field with high amplitude. However, resulting magnetization signal can very small dominate electromagnetism cellular matrices tracer concentration below <inline-formula...
<p>An adjustable helmet-style magnetoresistive (MR) sensor array, a room-temperature magnetic flux sensor, was developed to demonstrate simultaneous multipoint measurement of the somatosensory evoked field (SEF). The SEF measured in three healthy subjects using an array 30-channel MR sensors placed on left hemisphere head with median nerve stimulation right wrist and averaged over 8,000 measurements. An M20 component (maximum amplitude 725 ± 257 fT, peak latency 20.5 0.45 ms),...
<p>An adjustable helmet-style magnetoresistive (MR) sensor array, a room-temperature magnetic flux sensor, was developed to demonstrate simultaneous multipoint measurement of the somatosensory evoked field (SEF). The SEF measured in three healthy subjects using an array 30-channel MR sensors placed on left hemisphere head with median nerve stimulation right wrist and averaged over 8,000 measurements. An M20 component (maximum amplitude 725 ± 257 fT, peak latency 20.5 0.45 ms),...
With two typical parent actions we have kinds of dual worlds: i) one which contains an electric as well magnetic current, and ii) the other (generalized) Chern-Simons terms. All these fields are defined on a curved spacetime arbitrary (odd) dimensions. A new form gauge transformations is introduced plays essential role in defining interaction with monopole or generalized
Abstract The nuclear magnetic relaxation rates of 7 Li and the conductivity in 5 AlO 4 have been measured up to 700°C. spin‐lattice time T, has a maximum at 610°C, which is due quadrupole caused by diffusion intrinsic vacancies.