A5102712335- Acoustic Wave Resonator Technologies
- Ferroelectric and Piezoelectric Materials
- Advanced MEMS and NEMS Technologies
- Advanced Sensor and Energy Harvesting Materials
- Force Microscopy Techniques and Applications
- Analytical Chemistry and Sensors
- Semiconductor materials and devices
- Ultrasonics and Acoustic Wave Propagation
- Nanofabrication and Lithography Techniques
- Advancements in Photolithography Techniques
- Chemical Looping and Thermochemical Processes
- Nanowire Synthesis and Applications
- Thermochemical Biomass Conversion Processes
- Advanced Surface Polishing Techniques
- Polymer crystallization and properties
- Conducting polymers and applications
- Silicon Nanostructures and Photoluminescence
- Polymer Nanocomposites and Properties
- Semiconductor Lasers and Optical Devices
- Molecular Junctions and Nanostructures
- Subcritical and Supercritical Water Processes
- Photonic and Optical Devices
- Advanced Chemical Sensor Technologies
- Metal and Thin Film Mechanics
- Fatigue and fracture mechanics
Shibaura Institute of Technology
2022-2025
Tohoku University
2015-2024
Astellas Pharma (Japan)
2018
Tohoku University Hospital
2015
Sendai University
2014
Advanced Institute of Materials Science
2010-2014
Kyushu Institute of Technology
2013
Institute for Materials Research, Tohoku University
2011-2012
Tohoku Gakuin University
1994-2010
Keio University
2008
ABSTRACT In order to investigate the fatigue properties of high‐strength steels in very long‐life regime up over 10 9 cycles, cantilever‐type rotating bending tests were carried out for two kinds steels, SUJ2 and SNCM439, which machined by grinding finished electropolishing after grinding. And also, residual stress on specimen surface ground was examined X‐ray diffractometer effects properties. From investigations, S–N curves clearly have a tendency decrease again longer‐life range 7 cycles...
The peptidylglycine alpha-amidating enzyme catalyzes a reaction that transforms carboxyl-terminal glycine-extended precursor into alpha-amidated peptide. We purified an from equine serum by simplified steps including substrate affinity chromatography. With the enzyme, we detected intermediate of high performance liquid chromatography analysis. production required copper, oxygen, and ascorbate increased linearly with incubation time. structure was determined to be hydroxyl derivative at...
We have developed an LSI-based amperometric sensor called "Bio-LSI" with 400 measurement points as a platform for electrochemical bio-imaging and multi-point biosensing. The system is comprised of 10.4 mm × CMOS chip 20 unit cells, external circuit box, control data acquisition, DC power box. Each cell the contains operational amplifier switched-capacitor type I–V converter in-pixel signal amplification. successfully realized wide dynamic range from ±1 pA to ±100 nA well-organized design...
A stress-induced substance(s) (factor C) incubated with norepinephrine (NE) has strong flower-inducing activity in Lemna paucicostata. We isolated an essential component (FIF) of factor C, and clarified its chemical structure as 9-hydroxy-10-oxo-12(Z),15(Z)-octadecadienoic acid, α-ketol derivative linolenic which is formed via 9-hydroperoxy acid. Synthesized FIF showed after incubation NE C activity) equivalent to that the stressed Lemna. Jasmonic acid...
We successfully developed sputter deposition technology to obtain a highly c-axis-oriented monocrystalline Pb(Zr, Ti)O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> (PZT) thin film on Si wafer by fast cooling (~-180°C/min) of the substrate after deposition. The c-axis orientation ratio fast-cooled was about 90%, whereas that slow-cooled (~-40°C/min) only 10%. Pb(Zr xmlns:xlink="http://www.w3.org/1999/xlink">0.5</sub> , Ti )O films...
In this study, we fabricated a row-column addressed 2-dimensional piezoelectric micromachined ultrasonic transducer (pMUT) array based on the monocrystalline Pb(Zr, Ti)O3 (Mono PZT)-based thin film, and demonstrated its application as ultrasound imager. At first, optimized island-shaped design an individual element, then developed fabrication process control of edge shape insulative polymer pattern. As result, hexagonally arranged arrays with 372 elements at maximum were successfully, which...
The reduction of polychlorinated biphenyl (PCB) emissions to the environment are contemporary issues global efforts, and possible destruction technologies have be selected evaluated for PCB remediation. In this study in subcritical supercritical water were assessed under oxidative conditions nonoxidative, alkaline conditions. both cases PCBs could destroyed by more than 99%. formation dibenzofurans (PCDFs) during was evaluated. Under nonoxidative treatments sub- conditions, PCDFs observed....
We have developed a large-scale integrated (LSI) complementary metal-oxide semiconductor (CMOS)-based amperometric sensor array system called "Bio-LSI" as platform for electrochemical bio-imaging and multi-point biosensing with 400 measurement points. In this study, we newly Bio-LSI chip light-shield structure mode-selectable function the aim of extending application range Bio-LSI. The light shield created by top metal layer LSI significantly reduces noise generated photocurrent, whose value...
A new local redox cycling-based electrochemical (LRC-EC) device integrated with many sensors has been developed into a small chip device. The LRC-EC was successfully applied for detection of alkaline phosphatase and horseradish peroxidase activity in substrate generation/chip collection (SG/CC) extended feedback modes, respectively. imaging approach mode particularly effective sharpening the image, because this uses signals minimizes undesired influence diffusion. is considered to be useful...
The gasification of active carbon and coal with CO2 (the Boudouard reaction: C + = 2CO) was studied using a molten salt mixture K2CO3 Na2CO3) at 1123 K to apply this system solar energy conversion into chemical energy. On the solar/chemical hybridization obtain CH3OH as fuel, can directly gasify by reaction. reaction rate CO enhanced 1.5 3.3 times in presence salt, respectively, compared absence salt. suggested have two steps: first step is coke production pyrolysis, second catalytic effect...
This paper presents a fibered-epitaxial lead zirconate titanate (PZT) thin film with intermediate features between the monocrystalline and polycrystalline films for piezoelectric micromachined ultrasound transducer (pMUT). The grain boundaries confirmed by scanning electron microscopy, but it still maintained in-plane epitaxial relationship found X-ray diffraction analyses. dielectric constant (εr33 = 500) was relatively high compared to those of films, lower than conventional near...
The electrical modification of a conductivity-switching polyimide film via molecular layer deposition (MLD) is studied for ultrahigh density data storage based on scanning probe microscope (SPM). A PMDA–ODA (PMDA = 1, 2, 3, 5-benzenetetracarboxylic anhydride, ODA 4, 4-oxydianiline) as recording medium uniformly formed from self-assembled monolayer Au surface by MLD. It demonstrated that the conductivity can be changed applying voltage between SPM and film. This phenomenon discussed orbital...
This Letter reports on the deposition of a conductivity-switching polyimide film as recording medium formed by molecular layer (MLD). It also electrical modification it using scanning probe microscope (SPM). The is uniformly deposited an Au surface MLD. As result modification, highly conductive dots pattern with narrow pitch approximately 50 nm successfully defined applying pulsed voltages. current ratio modified area to unmodified reached 300 at least.
This paper reports on the use of hydrogen anneal to enhance torsional fracture strength dry-etched single crystal silicon (SCS) microstructures. Moving-magnet-type scanning mirrors with torsion bars were employed as test specimens. Two types device fabricated using SCS and silicon-on-insulator (SOI) wafers by deep reactive ion etching (DRIE). For SCS-wafer-based device, scalloping DRIE sidewalls smoothed out bar was improved a factor three 120 min anneal. SOI-wafer-based introduced surface...
This paper reports on the fabrication of a complementary metal oxide semiconductor (CMOS)-based 20 × amperometric sensor array integrated with boron-doped diamond (BDD) microelectrodes. The BDD electrodes were formed Si wafer at 800 °C, and then transferred to 0.18 μm CMOS large-scale integration (LSI) benzocyclobutene bonding interlayer. As result, microelectrodes arrayed without significant damage circuit or electrodes. LSI exhibited excellent performance for electrochemical analysis....
In this paper, we have developed a tablet-shaped ingestible core-body temperature sensor based on gastric acid power generation for daily health care. A custom integrated circuit (IC), which had voltage boosting, bit-rate conversion, coding, modulating, and transmitting functions, was prototyped the feasibility study of system. pair Mg Au electrodes chosen as negative positive battery, respectively. The battery with diameter 2 mm in an artificial juice generated approximately 1.2 V output...
In this study, we have demonstrated the usability of an epitaxial lead zirconate titanate (Epi-PZT) thin film for a piezoelectric micromachined ultrasonic transducer (pMUT) imager. At first, transmitting abilities and receiving sensitivities single-element pMUT based on Epi PZT polycrystalline (Poly-PZT) were evaluated as fundamental study. Then, 8-ch linear array system driven by commercially-available pulser board was built, successfully formed focused beam. Finally, obtained images...