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408 results on '"Takaki, Koichi"'

5. List of contributors

Author

Boussetta, Nadia, primary, Débora, Pez Jaeschke, additional, Drévillon, Lucie, additional, El Kantar, Sally, additional, García, María Concepción, additional, Hernández-Corroto, Ester, additional, Higa, Osamu, additional, Itoh, Shigeru, additional, Julia, Ribeiro Sarkis, additional, Kolb, Juergen F., additional, Koubaa, Mohamed, additional, Kuraya, Eisuke, additional, Lebovka, Nikolai, additional, Louka, Nicolas, additional, Marina, María Luisa, additional, Maroun, Richard G., additional, Maroušek, Josef, additional, Maroušková, Anna, additional, Marwa, Brahim, additional, Mikhaylin, Sergey, additional, Mitri, Sara, additional, Nemer, Georgio, additional, Ohshima, Takayuki, additional, Pasdar, Nasim, additional, Poliana, Deyse Gurak, additional, Sharifi, Akram, additional, Strunecký, Otakar, additional, Taherkhani, Atefe, additional, Takahashi, Katsuyuki, additional, Takaki, Koichi, additional, Tanino, Takanori, additional, Vorobiev, Eugene, additional, and Zocher, Katja, additional

Published
2023
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10. Production of High-Power Nitrogen Sputtering Plasma for TiN Film Preparation.

Author

Sato, Taishin, Igarashi, Sawato, Takahashi, Katsuyuki, Mukaigawa, Seiji, and Takaki, Koichi

Subjects
TITANIUM nitride films, ELECTRON density, MAGNETIC flux density, NITROGEN plasmas, MAGNETIC confinement, GLOW discharges
Abstract

High-density nitrogen plasma was produced using a high-power pulsed power modulator to sputter titanium targets for the preparation of titanium nitride film. The high-power pulsed sputtering discharge unit consisted of two targets facing each other with the same electrical potential. The titanium target plates were used as target materials with dimensions of 60 mm length, 20 mm height, and 5 mm thickness. The gap length was set to be 10 mm. The magnetic field was created with a permanent magnet array behind the targets. The magnetic field strength at the gap between the target plates was 70 mT. The electrons were trapped by the magnetic and electric fields to enhance the ionization in the gap. The nitrogen and argon gases were injected into the chamber with 4 Pa gas pressure. The applied voltage to the target plates had an amplitude from −600 V to −1000 V with 600 μs in pulse width. The target current was approximately 10 A with the consumed power of 13 kW. The discharge sustaining voltage was almost constant and independent of the applied voltage, in the same manner as the conventional normal glow discharge. The ion density and electron temperature at the surface of the ionization region were obtained as 1.7 × 1019 m−3 and 3.4 eV, respectively, by the double probe measurements. The vertical distribution of ion density and electron temperature ranged from 1.1 × 1017 m−3 (at 6 cm from the target edge) to 1.7 × 1019 m−3 and from 2.4 eV (at 6 cm from the target edge) to 3.4 eV, respectively. From the emission spectra, the intensities of titanium atoms (Ti I), titanium ions (Ti II), and nitrogen ions (N2+) increased with increasing input power. However, the intensities ratio of Ti II to Ti I was not affected by the intensities from N2+. [ABSTRACT FROM AUTHOR]

Published
2024
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28. The Effects of AC Electric Field on Ice Nucleation in the Super‐Cooling of a Distilled Water.

Author

Takahashi, Katsuyuki, Fujiwara, Yuri, Sawada, Yota, Takaki, Koichi, and Nakanishi, Masahiro

Subjects
ELECTRIC field effects, ICE fields, NUCLEATION, RATE of nucleation, ELECTRIC fields
Abstract

The effects of an AC electric field on ice nucleation temperature and nucleation rate were investigated by freezing distilled water while exposing it to varied AC electric field strengths and frequencies. To eliminate the influence of ion injections and electric field concentrations at a metal electrode surface on ice nucleation, distilled water filled in resin cuvettes are used as samples. The samples are exposed to AC electric field induced by parallel plate electrodes placed outside of the cuvettes. The cuvettes and parallel plate electrodes placed in a freezer with an inside temperature fixed at −15°C. The electric field strength in the sample is 2 or 7.5 kV/m and frequency varies from 50 Hz to 10 kHz. The ice nucleation temperature and the nucleation rate of distilled water increase with increasing the electric field strength and the frequency. © 2023 Institute of Electrical Engineer of Japan and Wiley Periodicals LLC. [ABSTRACT FROM AUTHOR]

Published
2024
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32. Elimination Effect of Airborne Fungi Using Dielectric Barrier Discharges Driven by a Pulsed Power Generator

Author

Katsuyuki Takahashi, Ishida Shinji, Alexis Guionet, T. Terazawa, Takuto Kikuchi, and Takaki Koichi

Subjects
Ozone, Generator (computer programming), Materials science, business.industry, Biomedical Engineering, General Physics and Astronomy, Dielectric, Pulsed power, Penicillium italicum, chemistry.chemical_compound, medicine.drug_formulation_ingredient, chemistry, Electrostatic precipitation, medicine, Optoelectronics, business, Pathogen inactivation
Published
2020

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