A5022593560- Luminescence Properties of Advanced Materials
- Radiation Detection and Scintillator Technologies
- Advanced Chemical Sensor Technologies
- Control Systems and Identification
- Advanced X-ray Imaging Techniques
- Advanced Surface Polishing Techniques
- Image and Signal Denoising Methods
- Digital Filter Design and Implementation
- Insect Pheromone Research and Control
- Advanced Adaptive Filtering Techniques
- Structural Health Monitoring Techniques
- Glass properties and applications
- Advanced Data Compression Techniques
- Fault Detection and Control Systems
- Blind Source Separation Techniques
- Gas Sensing Nanomaterials and Sensors
- Advanced Measurement and Metrology Techniques
- Fire Detection and Safety Systems
- Digital Radiography and Breast Imaging
- Advanced Fiber Laser Technologies
- Scientific Measurement and Uncertainty Evaluation
- Photonic and Optical Devices
- Wireless Communication Security Techniques
- Laser-Plasma Interactions and Diagnostics
- Semiconductor Lasers and Optical Devices
National Institute of Advanced Industrial Science and Technology
2018-2023
Kanazawa Institute of Technology
2012-2022
Nippon Sport Science University
2022
National Institute of Technology Akita College
2018-2021
The University of Tokyo
2012-2020
Japan Advanced Institute of Science and Technology
2019-2020
National Institute of Technology
2019
Waseda University
2013-2016
Nagaoka University of Technology
2003-2012
Hosei University
2012
In X-ray focusing, grazing incidence mirrors offer advantages of no chromatic aberration and high focusing efficiency. Although nanofocusing have been developed for the hard region, there is mirror with performance in soft region. Designing a system ability to focus beam size smaller than 100 nm at an energy less 1 keV requires numerical aperture larger 0.01. This leads difficulties fabrication accuracy. Ellipsoidal enable aperture. this study, we report production process ellipsoidal...
In optics fields, an extremely smooth surface with a complex form is necessary for the lens and mirror used in advanced optical systems, although their surfaces are still difficult to polish. Here, we describe machining of steeply curved by rotating-sphere EEM (elastic emission machining). Thus far, use has been limited flat gradually spite its high performance. We demonstrated successful application glass cylinder, resulting decrease RMS (root mean square) roughness from 0.30 0.16 nm.
An x-ray ellipsoidal mirror is an ideal tool for focusing soft x-rays. Because nanometer-level shape accuracy required in the internal surface of a having small diameter, it difficult to fabricate by processing directly. We developed fabrication process mirrors which high-precision quartz mandrel with inverted designed replicated nickel sulfamate electroforming. In this study, 40-mm length was fabricated and evaluated measurement method using contact probe. The root mean square (RMS)...
We demonstrate broadband focusing of multiple high-order harmonics intense femtosecond laser pulses using an ellipsoidal mirror. The mirror, with a high numerical aperture and highly accurate surface, was fabricated replication process. in the wavelength range between 10 20 nm were focused to nearly diffraction-limited size 350 × 380 nm2. According Rayleigh's quarter criteria, wavefront aberration beam estimated be less than 5 nm, which corresponds temporal dispersion 16 as. developed system...
Ellipsoidal mirrors are promising optical devices for soft x-ray focusing. A fabrication process consisting of master and replication has been developed to produce ellipsoidal with wide apertures approximately 10 mm. In the present study, focusing performance an mirror was evaluated using x-rays in beamline BL25SU-a SPring-8. The focus sizes were measured at photon energies 300, 400, 500 eV. quantitative figure error also by analyzing wavefield focused beam retrieved ptychography....
The lifting scheme is well known to be an efficient tool for constructing second generation wavelets and often used design a class of biorthogonal wavelet filter banks. For its efficiency, the implementation has been adopted in international standard JPEG2000. It that orthogonality important property many applications. This paper presents how implement infinite-impulse-response (IIR) orthogonal banks by using with two steps. shown IIR can realized allpass filters Then, proposed discussed....
Ellipsoidal mirrors are one of the most promising types X-ray mirror, because mirror can focus X-rays to nanometer size with a large aperture and no chromatic aberration. However, so far ideal ellipsoidal cannot be realized by any manufacturing methods. One reasons is there fabrication method process their inside surface diameter several millimeters nanometer-level accuracy. We propose develop mirror. First, master which has reversed shape prepared using grinding, polishing Elastic Emission...
1Advanced Materials Science Research and Development Center, Kanazawa Institute of Technology, 3-1 Yatsukaho, Hakusan, Ishikawa 924-0838, Japan 2Oarai Chiyoda Technol Corpration, 3681 Narita-cho, Oarai-machi Higashi-ibaraki-gun, Ibaraki 311-1313, 3Nagase Landauer, C22 gaiku-1, Suwa, Tsukuba, 300-2686, 4Graduated School Natural University, Kakuma-cho, Kanazawa, 920-1192, 5Ishikawa Prefectural Public Health Environment Science, 1-11 Taiyogaoka, 920-1154, 6NEDO Photonics for Integrated...
Optical properties such as optical absorption and radiophotoluminescence (RPL) spectra of silver (Ag+)-doped phosphate glass before after x-ray irradiation were investigated in this study. It is found that the RPL spectrum consists two emission bands which are peaked at 2.70 eV (460 nm blue emission) 2.21 (560 yellow emission). also intensity gradually increases with dose. From results it suggested origin each 460 560 band ascribed to Ag0 ion Ag2+ ion, respectively, produced by irradiation....
Ultraprecise optical elements are applied in advanced apparatus. Elastic emission machining (EEM) is one of the ultraprecision methods used to fabricate shapes with 0.1-nm accuracy. In this study, we proposed and experimentally tested control shape a stationary spot profile by introducing focusing-flow state between nozzle outlet workpiece surface EEM. The simulation results indicate that sharpens distribution velocity on surface. experiments verified those simulation. obtained conditions...
Recently, a brain-computer interface (BCI) using virtual sound sources has been proposed for estimating user intention via electroencephalogram (EEG) in an oddball task. However, its performance is still insufficient practical use. In this study, we examine the impact that shortening stimulus onset asynchrony (SOA) on auditory BCI. While very short SOA might improve performance, perception and task become difficult, event-related potentials (ERPs) may not be induced if too short. Therefore,...
We have developed a focusing system for extreme ultraviolet light produced by high-order harmonic generation. An ellipsoidal mirror with precise surface shape was fabricated and installed into the system. A rigid manipulator beam profiler were employed to perform stable alignment. As demonstration of performance, harmonics in wavelength range 13.5–19.5 nm successfully focused 2.4 × 2.3 μm2 spot.
An intense optically stimulated luminescence (OSL) with four emission bands in the wavelength range from 290 to 420 nm is observed for first time X-ray-irradiated Tm-doped CaF 2 (CaF :Tm) phosphor crystal.The OSL intensity increases almost linearly increasing X-ray absorbed dose.Thermally (TSL) glow curves peaks are also :Tm crystal.It confirmed that shape of TSL curve crystal same as a commercially available dosimeter (TLD-300).An and stimulation mechanism proposed.
Journal Article Eu-doped CsBr phosphor as a new optically-stimulable material for medical x-ray imaging sensor Get access N. Kurata, Kurata Advanced Materials Science R&D Center, Kanazawa Institute of Technology, 3-1 Yatsukaho, Mattou, Ishikawa 924-0838, Japan *Corresponding author: hnanto@neptune.kanazawa-it.ac.jp Search other works by this author on: Oxford Academic PubMed Google Scholar Kubota, Kubota Y. Takei, Takei H. Nanto Radiation Protection Dosimetry, Volume 119, Issue 1-4,...
In this paper, we show experimental studies for three-dimensional gas source localization using a quad-rotor drone with semiconductor-type sensor array. The aerial robots equipped the sensors can be used to detect hazardous chemicals over wide areas. We have been developing 3D multi-copter, which has mounted directly under each rotor, and airflow generated by rotor utilized deliver gases around sensors. array outputs during both horizontal vertical movements in plume spread space was...
This paper shows that experimental results for three-dimensional odor plume tracking using a multicopter with semiconductor-type gas sensor array. The 3D aerial robot monitoring of forest fire is developed, and the quadcopter has four pairs put on under each rotor to expose sensors localized airflow made by rotors, which will be prepared detect change odorants generation hydrogen in early stage fire. Here it investigated detecting estimating direction arrival (DOA) source. preliminary...
In the decommissioning of a nuclear power plant, especially for decontamination radioactive substances caused by 2011 Fukushima plant accident, which has affected reconstruction after earthquake, dose evaluation and validation effect are very important.To prepare novel passive-type dosimeter system, can be applied to radiation monitoring visualization two-dimensional distribution ionizing in contaminated area, we tried develop bead-and sheet-type glass dosimeters utilizing...