Ammonia (NH 3 ) is extremely important as a raw material of chemical fertilizers for food production. NH 3 was produced in water irradiated with an atmospheric-pressure argon (Ar) plasma jet in air. The concentration of ammonium ions (NH 4+ ) in water was measured under different plasma irradiation time, applied voltage, and plasma irradiation distance. The concentration of formed NH 4+ increased almost in proportion to the plasma irradiation time and the applied voltage. The maximum NH 4+ concentration obtained in this study was 43.2 µM at an applied voltage of 10 kV, an Ar gas flow rate of 10 L/min, a plasma irradiation distance of 10 mm, and a plasma irradiation time of 80 min. During plasma irradiation, the water temperature was ~26 °C.
{"title":"Ammonia synthesis by atmospheric-pressure plasma jet at room temperature","authors":"Takumi Tsuji, H. Kuwahata, I. Mikami","doi":"10.2978/jsas.33105","DOIUrl":"https://doi.org/10.2978/jsas.33105","url":null,"abstract":"Ammonia (NH 3 ) is extremely important as a raw material of chemical fertilizers for food production. NH 3 was produced in water irradiated with an atmospheric-pressure argon (Ar) plasma jet in air. The concentration of ammonium ions (NH 4+ ) in water was measured under different plasma irradiation time, applied voltage, and plasma irradiation distance. The concentration of formed NH 4+ increased almost in proportion to the plasma irradiation time and the applied voltage. The maximum NH 4+ concentration obtained in this study was 43.2 µM at an applied voltage of 10 kV, an Ar gas flow rate of 10 L/min, a plasma irradiation distance of 10 mm, and a plasma irradiation time of 80 min. During plasma irradiation, the water temperature was ~26 °C.","PeriodicalId":14991,"journal":{"name":"Journal of Advanced Science","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88520572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
evaluation by electrochemical method and the microstructure observation by EPMA analysis. From the results of the polarization curve, the corrosion resistance at the brazing time of 3 hours was the best. Results of microstructure observation, it was confirmed that the formation of the Cr-depletion zone was suppressed when the brazing time was 1 hour and 3 hours. From these results, it was suggested that good corrosion resistance of the brazed joint was obtained by long time brazing. These results provide new insights in determining future brazing conditions.
{"title":"Effect of controlled microstructure brazed with foil-type Ni-based filler metal on corrosion resistance of stainless steel joint","authors":"M. Ono, Koki Yamazaki, Y. Miyazawa, Y. Bizen","doi":"10.2978/jsas.33106","DOIUrl":"https://doi.org/10.2978/jsas.33106","url":null,"abstract":"evaluation by electrochemical method and the microstructure observation by EPMA analysis. From the results of the polarization curve, the corrosion resistance at the brazing time of 3 hours was the best. Results of microstructure observation, it was confirmed that the formation of the Cr-depletion zone was suppressed when the brazing time was 1 hour and 3 hours. From these results, it was suggested that good corrosion resistance of the brazed joint was obtained by long time brazing. These results provide new insights in determining future brazing conditions.","PeriodicalId":14991,"journal":{"name":"Journal of Advanced Science","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84462688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tomoya Kubotera, Takumi Oishi, T. Arakawa, Koji Toma, K. Mitsubayashi
In this study, a mouthpiece type biosensor using uric acid oxidase (uricase) was developed to measure uric acid in saliva. The mouthpiece biosensor used to monitor salivary uric acid, which has been reported to correlate with blood uric acid levels. The characteristics of the fabricated biosensor were examined based on phosphate buffer solution and artificial saliva. As a result, the mouthguard sensor could quantify the uric acid concentration in the range of 0.1-10 μmol/L. This mouthpiece biosensor will provide useful method for unrestricted and non-invasive saliva uric acid monitoring.
{"title":"Uric acid mouthpiece biosensor integrated with Bluetooth low energy wireless module for salivary uric acid measurement","authors":"Tomoya Kubotera, Takumi Oishi, T. Arakawa, Koji Toma, K. Mitsubayashi","doi":"10.2978/jsas.33301","DOIUrl":"https://doi.org/10.2978/jsas.33301","url":null,"abstract":"In this study, a mouthpiece type biosensor using uric acid oxidase (uricase) was developed to measure uric acid in saliva. The mouthpiece biosensor used to monitor salivary uric acid, which has been reported to correlate with blood uric acid levels. The characteristics of the fabricated biosensor were examined based on phosphate buffer solution and artificial saliva. As a result, the mouthguard sensor could quantify the uric acid concentration in the range of 0.1-10 μmol/L. This mouthpiece biosensor will provide useful method for unrestricted and non-invasive saliva uric acid monitoring.","PeriodicalId":14991,"journal":{"name":"Journal of Advanced Science","volume":"89 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79178413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. Gemma, M. Sato, Masae Kanda, Ryota Gemma, Kaoru Hoshino, Jun-ichi Kawano
Transition from internal nitriding to rapid nitriding at 12.5 mol% Cr in austenitic Fe-Cr-Ni alloy system is investigated from a Cr skeleton model based on atomic arrangement of Cr atoms in the alloys. The rapid nitriding is observed above the 12.5 mol% Cr of alloys. Kinetics of the rapid nitriding is only performed at local space of 25.0 mol% Cr in the alloys. The kinetics is discussed as a kind of lasering in thermodynamic system.
{"title":"Transition of rate mechanism from internal nitriding to rapid nitriding mechanism at 12.5 mol%Cr in austenitic Fe-Cr-Ni alloy system","authors":"K. Gemma, M. Sato, Masae Kanda, Ryota Gemma, Kaoru Hoshino, Jun-ichi Kawano","doi":"10.2978/jsas.32107","DOIUrl":"https://doi.org/10.2978/jsas.32107","url":null,"abstract":"Transition from internal nitriding to rapid nitriding at 12.5 mol% Cr in austenitic Fe-Cr-Ni alloy system is investigated from a Cr skeleton model based on atomic arrangement of Cr atoms in the alloys. The rapid nitriding is observed above the 12.5 mol% Cr of alloys. Kinetics of the rapid nitriding is only performed at local space of 25.0 mol% Cr in the alloys. The kinetics is discussed as a kind of lasering in thermodynamic system.","PeriodicalId":14991,"journal":{"name":"Journal of Advanced Science","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80199447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Destruction accidents mean not only machine troubles but also human errors. An incident is reoffered to as a situation just before accidental situation. The industry has experienced unexpected accidents and destructions, and has become the cornerstone of technological development in each field. In this issue, we will introduce our experiences in the non-destructive inspection industry and technological advances.
{"title":"Destructive accidents / incidents and non-destructive inspection technologies","authors":"Takanori Kobunai","doi":"10.2978/jsas.32701","DOIUrl":"https://doi.org/10.2978/jsas.32701","url":null,"abstract":"Destruction accidents mean not only machine troubles but also human errors. An incident is reoffered to as a situation just before accidental situation. The industry has experienced unexpected accidents and destructions, and has become the cornerstone of technological development in each field. In this issue, we will introduce our experiences in the non-destructive inspection industry and technological advances.","PeriodicalId":14991,"journal":{"name":"Journal of Advanced Science","volume":"74 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83218419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the 21st century, innovative products are born all over the world. By the evolution of digital technology, the manufacturing industry has been revolutionized. Today, the consumers can no longer be satisfied with mass-produced goods. The manufacturing industry needs an efficient production system that enables not only mass production but various customized goods. What role should a science park play? This paper describes and discusses the role of a science park through a case study on regenerative medicine industry.
{"title":"The new role of a science park for the current startup ecosystem in Japan：A case study on regenerative medicine industry","authors":"K. Harada","doi":"10.2978/jsas.32703","DOIUrl":"https://doi.org/10.2978/jsas.32703","url":null,"abstract":"In the 21st century, innovative products are born all over the world. By the evolution of digital technology, the manufacturing industry has been revolutionized. Today, the consumers can no longer be satisfied with mass-produced goods. The manufacturing industry needs an efficient production system that enables not only mass production but various customized goods. What role should a science park play? This paper describes and discusses the role of a science park through a case study on regenerative medicine industry.","PeriodicalId":14991,"journal":{"name":"Journal of Advanced Science","volume":"160 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75785400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Alshemeili, A. Nnadi, S. Visal, T. Kaneko, M. Isomura, T. Katsumata, M. Shahiduzzaman
Flexible and light-weight perovskite solar cells (PSCs) have been considered due to the expectation of low production cost and wide application ranges. Low temperature processes are required in the fabrication of flexible perovskite solar cells because flexible substrates cannot resist process temperatures over 150 ºC. An electron transport layer (ETL) is commonly titanium-oxide (TiO 2 ) formed by high temperature sintering (˃400ºC). The formation of ETL is crucial for flexible PSCs in order to complete the entire low-temperature process. Here, we have employed our original single crystalline TiO 2 nanoparticles with high purity of brookite phase (BK TiO 2 NPs), and could form TiO 2 ETLs below 150 ºC. We succeeded to fabricate flexible PSCs on polyethylene naphthalate (PEN) substrates with the power conversion efficiency of 13.08% (in reverse scan). The present work provides us a good finding to realize the low-cost flexible PSCs in the future.
{"title":"Development of flexible perovskite solar cells by the low-temperature fabrication of TiO2 electron transport layers","authors":"M. Alshemeili, A. Nnadi, S. Visal, T. Kaneko, M. Isomura, T. Katsumata, M. Shahiduzzaman","doi":"10.2978/jsas.32102","DOIUrl":"https://doi.org/10.2978/jsas.32102","url":null,"abstract":"Flexible and light-weight perovskite solar cells (PSCs) have been considered due to the expectation of low production cost and wide application ranges. Low temperature processes are required in the fabrication of flexible perovskite solar cells because flexible substrates cannot resist process temperatures over 150 ºC. An electron transport layer (ETL) is commonly titanium-oxide (TiO 2 ) formed by high temperature sintering (˃400ºC). The formation of ETL is crucial for flexible PSCs in order to complete the entire low-temperature process. Here, we have employed our original single crystalline TiO 2 nanoparticles with high purity of brookite phase (BK TiO 2 NPs), and could form TiO 2 ETLs below 150 ºC. We succeeded to fabricate flexible PSCs on polyethylene naphthalate (PEN) substrates with the power conversion efficiency of 13.08% (in reverse scan). The present work provides us a good finding to realize the low-cost flexible PSCs in the future.","PeriodicalId":14991,"journal":{"name":"Journal of Advanced Science","volume":"136 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76809840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Various inspection methods for screws that are frequently used in assembling all products has been reported to prevent accidents due to loosening in advance. However, there is no accurate and simple method at present. As a solution to this, previous research has developed an inspection system that combines mechanical impedance spectra and spectral pattern recognition. Following the research, studies on suppressing variation in measured values, reducing measurement time, and measuring small diameter screws have been advanced. As a subsequent study, we examined the effects of variation in the pressing load on small diameter screws, evaluated the contact position dependence between screws and probe, and investigated the effects of several different types of screws. Through these investigations, we aimed to realize an inspection system with highly accurate performance.
{"title":"Investigation of the factors to improve the accuracy of the inspection system for loosening screws using ultrasonic vibration","authors":"Haruhisa Kawasaki, Seiki Murayama, M. Kanetomo","doi":"10.2978/JSAS.32104","DOIUrl":"https://doi.org/10.2978/JSAS.32104","url":null,"abstract":"Various inspection methods for screws that are frequently used in assembling all products has been reported to prevent accidents due to loosening in advance. However, there is no accurate and simple method at present. As a solution to this, previous research has developed an inspection system that combines mechanical impedance spectra and spectral pattern recognition. Following the research, studies on suppressing variation in measured values, reducing measurement time, and measuring small diameter screws have been advanced. As a subsequent study, we examined the effects of variation in the pressing load on small diameter screws, evaluated the contact position dependence between screws and probe, and investigated the effects of several different types of screws. Through these investigations, we aimed to realize an inspection system with highly accurate performance.","PeriodicalId":14991,"journal":{"name":"Journal of Advanced Science","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85140442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hiroaki Miyamatsu, Toshikio Takimoto, A. Tonegawa, K. Kawamura, Kohnosuke Sato
In this study, similarity of behavior between the recombination plasma and aurora-curl have been investigated by using a magnetized sheet plasma. The magnetized sheet plasma is generated by a liner plasma device (TPDsheet-U). Plasma flow, and plasma parameters are measured by a high-speed camera, a mach probe and cylindrical probe. As the results, the plasma is rotating in the clockwise around the magnetic line and this rotation is derived from E × B drift like curl.
{"title":"Similarity of behavior between a recombination sheet plasma and aurora-curl","authors":"Hiroaki Miyamatsu, Toshikio Takimoto, A. Tonegawa, K. Kawamura, Kohnosuke Sato","doi":"10.2978/jsas.32105","DOIUrl":"https://doi.org/10.2978/jsas.32105","url":null,"abstract":"In this study, similarity of behavior between the recombination plasma and aurora-curl have been investigated by using a magnetized sheet plasma. The magnetized sheet plasma is generated by a liner plasma device (TPDsheet-U). Plasma flow, and plasma parameters are measured by a high-speed camera, a mach probe and cylindrical probe. As the results, the plasma is rotating in the clockwise around the magnetic line and this rotation is derived from E × B drift like curl.","PeriodicalId":14991,"journal":{"name":"Journal of Advanced Science","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84785181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Photovoltaic (PV) Generation system is one of the easiest renewable energy systems to generate either small amounts of energy for usage in households or for large amounts as utilized in fields. Although PV generation system does not burn fuel for power generation, some problems exist regarding heat. One of these problems is called Hotspots. A Hotspot is an increase in the cell`s heat in certain conditions and positions. In some cases, the heat can even ignite a fire. In this study, we propose a new method to detect this hotspot phenomenon at an early stage. The proposed method utilizes Artificial Intelligence (AI) as the main detection system. In fact, we were able to detect the hotspot with an accuracy of 82.25% using only two parameters, string current and string voltage. This system is a secondary system to be used in conjunction with the main control system. The output will be a flag sent to the main controlling system. Designing this system as secondary one, makes it easier to apply in already constructed PV fields. The findings illustrated the detection of hotspots with an accuracy rate of 82.25% using only two parameters, namely string current and string voltage. Thus the findings from this study provides a basis for the future development of a system which provides an overall evaluation for solar panels including hotspots and degradation.
{"title":"Development of Real-Time Hotspot Detection System Utilizing Artificial Intelligence in PV Generation System","authors":"A. Alhabib, K. Itako, T. Kudoh","doi":"10.2978/jsas.32103","DOIUrl":"https://doi.org/10.2978/jsas.32103","url":null,"abstract":"Photovoltaic (PV) Generation system is one of the easiest renewable energy systems to generate either small amounts of energy for usage in households or for large amounts as utilized in fields. Although PV generation system does not burn fuel for power generation, some problems exist regarding heat. One of these problems is called Hotspots. A Hotspot is an increase in the cell`s heat in certain conditions and positions. In some cases, the heat can even ignite a fire. In this study, we propose a new method to detect this hotspot phenomenon at an early stage. The proposed method utilizes Artificial Intelligence (AI) as the main detection system. In fact, we were able to detect the hotspot with an accuracy of 82.25% using only two parameters, string current and string voltage. This system is a secondary system to be used in conjunction with the main control system. The output will be a flag sent to the main controlling system. Designing this system as secondary one, makes it easier to apply in already constructed PV fields. The findings illustrated the detection of hotspots with an accuracy rate of 82.25% using only two parameters, namely string current and string voltage. Thus the findings from this study provides a basis for the future development of a system which provides an overall evaluation for solar panels including hotspots and degradation.","PeriodicalId":14991,"journal":{"name":"Journal of Advanced Science","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73012117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：