Journal of Advanced Science

Paper

Study on optimum parameter of MPPT converter unit in a PV generation system

Takuma ENDOH, Kazutaka ITAKO

Article type: Paper
2022 Volume 34 Article ID: 34101
Published: 2022
Released on J-STAGE: June 01, 2022

DOIhttps://doi.org/10.2978/jsas.34101

JOURNAL FREE ACCESS

Show abstractHide abstract

In this paper, we consider an optimum parameter of MPPT unit in the simple configuration of PV generation system by simulation. First, from the stabilization characteristics for MPPT operation of MPPT Converter unit (MC) and PCS, and we investigate the optimum parameter from MPPT operation. Next, we conducted a demonstration experiment using the parameters we obtained and confirmed their effectiveness. As a result, it is confirmed to increase the efficiency of operation of both MPPTs because of setting the P&O parameter of MC higher than that of the PCS. In addition, it is clarified that it is desirable to set the P&O parameter of MC 3 times or more that of the PCS under this simulation condition.

View full abstract

Download PDF (4710K)
Characterization of carbon nanotube formed by in-liquid plasma method

Nana ECHIGOYA, Yoshiyuki SHOW

Article type: Paper
2022 Volume 34 Article ID: 34102
Published: 2022
Released on J-STAGE: June 01, 2022

DOIhttps://doi.org/10.2978/jsas.34102

JOURNAL FREE ACCESS

Show abstractHide abstract

Carbon nanotube (CNT) dispersion was formed by the in-liquid plasma method. The CNTs were stably and uniformly dispersed in water by this method. The CNT dispersion and the PTFE dispersion were mixed. Use of CNT dispersion is a key process to form the CNT/PTFE dispersion with stability. The CNT/PTFE dispersion was applied to glass substrate to form the CNT/PTFE composite film. The composite films showed electrical conduction. The electrical conductivity was drastically increased by 6 orders with an increase at low range of the CNT concentration between 0.1 and 1 [%] in the composite film. On the other hand, the electrical conductivity was gradually increased by 2.5 times with an increase at high range between 10 and 100 [%]. The computer simulation was also carried out to reveal the conduction mechanism in the CNT/PTFE composite films.

View full abstract

Download PDF (689K)
Optimization of Brookite TiO₂ NPs Solution for Preparing the Electron Transport Layer of Flexible Perovskite Solar Cells

Nuth SOPHAL, Tetsuya KANEKO, Masao ISOMURA, Kohei KASUYA, Tetsuhiro KA ...

Article type: Paper
2022 Volume 34 Article ID: 34104
Published: 2022
Released on J-STAGE: June 01, 2022

DOIhttps://doi.org/10.2978/jsas.34104

JOURNAL FREE ACCESS

Download PDF (376K)
In-situ observation of buckling behavior during electrochemical hydrogen loading in Sm-Fe magnetostrictive thin films using acoustic emission (AE)

Seo ONO, Mutsuki MATSUMOTO, Takaya SATO, Kenta WATANABE, Makoto Ryo HA ...

Article type: Paper
2022 Volume 34 Article ID: 34105
Published: 2022
Released on J-STAGE: June 01, 2022

DOIhttps://doi.org/10.2978/jsas.34105

JOURNAL FREE ACCESS

Download PDF (1115K)
A consideration of the design of a medical device operation support system using smart glasses

Misato NAKATAKE, Tatsuhiro KIMURA, Miu SATOU, Ryo OGA, Ayane KOSE, Mit ...

Article type: Paper
2022 Volume 34 Article ID: 34106
Published: 2022
Released on J-STAGE: July 25, 2022

DOIhttps://doi.org/10.2978/jsas.34106

JOURNAL FREE ACCESS

Show abstractHide abstract

Due to the recent influence of the new coronavirus (SARS-CoV-2), opportunities to improve knowledge of new medical technologies are lacking. To provide safe medical technology, we examined the medical device operation support system using smart glasses, which is a wearable device. This system enables actual operation while watching operation videos of various devices when necessary and can also provide remote technical support. By comparing the performance of multiple smart glasses, we arrived at an appropriate system that can be used in clinical practice.

View full abstract

Download PDF (893K)

Letter

Mouthguard type biosensor for wireless measurement of salivary uric acid

Gentaro KAWASE, Takumi OISHI, Kenta IITANI, Koji TOMA, Takahiro ARAKAW ...

Article type: Letter
2022 Volume 34 Article ID: 34301
Published: 2022
Released on J-STAGE: June 01, 2022

DOIhttps://doi.org/10.2978/jsas.34301

JOURNAL FREE ACCESS

Show abstractHide abstract

The number of hyperuricemia patients has been increasing. It is important that keep normal uric acid (UA) levels to prevent complicating disease of hyperuricemia. The current standard of UA tests uses a blood sample. However, it is not suitable for self-monitoring of UA level because it involves the burden of puncture and the risk of infection by taking a blood sample. Personal UA sensor is expected to monitor diurnal variation without invasiveness in a casual manner. In this study, we fabricated and evaluated a uricase-based biosensor toward the non-invasive continuous measurement of salivary UA concentration in the oral cavity. Uricase catalyzed UA and produced H₂O₂ in an enzyme-immobilized membrane on a Pt electrode. Then, generated H₂O₂ concentration which is correlated to the UA concentration was measured by the chronoamperometry technique. As a result, not only a wide dynamic range (0.1–10 μmol/L) but also high selectivity for UA was observed. In the future, the developed UA biosensor would allow monitoring UA levels non-invasively and continuously.

View full abstract

Download PDF (679K)

Register with J-STAGE for free!