Hiromitsu Noguchi

20140506-59
Estimation of Self-Ignited Plasma Density Using Plasma-Based Ion Implantation
Nobuyuki Fujimura, Kazuhiro Shimono, Hiromitsu Noguchi, Hiroshi Toyota, Yoshito Shirai, Takeshi Tanaka

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Plasma density is estimated from the target voltage and current characteristics of the pulse modulator circuit in plasma-based ion implantation. The voltage recovery time constant directly reflects the ion sheath characteristics, ...  read more

20140506-58
Spore-Forming Bacteria Sterilization Using Plasma-Based Ion Implantation
Koji Kakugawa, Masatoshi Kubo, Hiromitsu Noguchi, Kazuhiro Shimono, Nobuyuki Fujimura, Yoshinobu Tsuchiya, Takeshi Tanaka

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A main purpose of sterilization is to kill the harmful microorganisms. In food industry, the representatives of microorganisms which are difficult to sterilize are spore-forming bacteria. Because these bacteria are extremely ...  read more

20140506-57
Comparison of Plasma Spectral Characteristics Using a Plasma- Based Ion Implantation
Hiromitsu Noguchi, Nobuyuki Fujimura, Kazuhiro Shimono, Hiroshi Toyota, Yoshito Shirai and Takeshi Tanaka

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Plasma-based ion implantation is a recently developed technique used to modify the surface of materials by immersion in plasma coupled with the application of a negative bias voltage.

In this study, we compare the properties ...  read more

20140506-55
Pulse Width Dependence of the Self-Ignited Plasma Using a Plasma-Based Ion Implantation
Kazuhiro Shimono, Nobuyuki Fujimura, Hiromitsu Noguchi, Hiroshi Toyota, Yoshito Shirai, Takeshi Tanaka, Katia Vutova

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Plasma based ion implantation (PBII) with high negative pulsed voltage applied to the test specimen has been applied to the sterilization process as a technique suitable for three-dimensional work pieces. We found that the ...  read more

20160506-56
Spore-forming bacteria sterilization using plasma-based ion implantation (2nd report)
Koji Kakugawa, Kai Saitoh, Kenya Hayashi, Kazuhiro Shimono, Hiromitsu Noguchi, Yoshinobu Tsuchiya, Takeshi Tanaka

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A main purpose of sterilization is to kill the harmful microorganisms. The spore-forming bacteria which are present in foods frequently cause food spoilage. Although the vegetative cells of those bacteria are sterilized easily, ...  read more