Up-conversion phosphors emit light with shorter wavelength than that of excitation light. This phenomenon is caused by multi-photon excitation and energy transfer in f orbital of rare earth elements. In this study, La2ZnTiO6 and La2MgTiO6 doped with different amounts of Er and Yb was synthesized by the complex gelation method and the up-conversion (UPC) emission was investigated. In addition, we investigated the difference in optimum amount of Er and Yb for UPC emission due to host crystals. Main crystal phases of the synthesized samples were identified as La2ZnTiO6 and La2MgTiO6 respectively by X-ray diffraction. Up-conversion emissions were measured using a spectrometer with a multi-channel photo detector and a diode laser emitting excitation light at 980nm. The optimum amount of Er and Yb in (La, Er, Yb)2ZnTiO6 for the up-conversion emission were 1mol% and 5mol%, respectively. On the other hand, the optimum amount of Er and Yb in (La, Er, Yb)2MgTiO6 were 2mol% and 2mol%, respectively. The optimized sample showed strong green and red emissions. As the result, it was shown that the double perovskite type oxide doped with Er and Yb showed UPC luminescence, and the optimum doping amount of Er and Yb depended on the host crystal.
上转换荧光粉发出的光比激发光的波长短。这种现象是由稀土元素f轨道的多光子激发和能量转移引起的。本研究采用络合胶凝法制备了掺杂不同量Er和Yb的La2ZnTiO6和La2MgTiO6，并对其上转换(UPC)发射进行了研究。此外，我们还研究了由于宿主晶体的不同，Er和Yb在UPC发射中的最佳用量的差异。经x射线衍射鉴定，合成样品的主要晶相分别为La2ZnTiO6和La2MgTiO6。采用多通道光电探测器和发射980nm激发光的二极管激光器组成的光谱仪测量上转换发射。(La, Er, Yb)2ZnTiO6中Er和Yb的最佳添加量分别为1mol%和5mol%。另一方面，(La, Er, Yb)2MgTiO6中Er和Yb的最佳用量分别为2mol%和2mol%。优化后的样品具有较强的绿色和红色排放。结果表明，掺杂Er和Yb的双钙钛矿型氧化物表现出UPC发光，Er和Yb的最佳掺杂量取决于主体晶体。
{"title":"Synthesis and up-conversion emission properties of Er-Yb co-doped double perovskite oxides","authors":"M. Ishii, N. Nakazato, Kohei Kasuya, K. Tomita","doi":"10.2978/JSAS.31102","DOIUrl":"https://doi.org/10.2978/JSAS.31102","url":null,"abstract":"Up-conversion phosphors emit light with shorter wavelength than that of excitation light. This phenomenon is caused by multi-photon excitation and energy transfer in f orbital of rare earth elements. In this study, La2ZnTiO6 and La2MgTiO6 doped with different amounts of Er and Yb was synthesized by the complex gelation method and the up-conversion (UPC) emission was investigated. In addition, we investigated the difference in optimum amount of Er and Yb for UPC emission due to host crystals. Main crystal phases of the synthesized samples were identified as La2ZnTiO6 and La2MgTiO6 respectively by X-ray diffraction. Up-conversion emissions were measured using a spectrometer with a multi-channel photo detector and a diode laser emitting excitation light at 980nm. The optimum amount of Er and Yb in (La, Er, Yb)2ZnTiO6 for the up-conversion emission were 1mol% and 5mol%, respectively. On the other hand, the optimum amount of Er and Yb in (La, Er, Yb)2MgTiO6 were 2mol% and 2mol%, respectively. The optimized sample showed strong green and red emissions. As the result, it was shown that the double perovskite type oxide doped with Er and Yb showed UPC luminescence, and the optimum doping amount of Er and Yb depended on the host crystal.","PeriodicalId":14991,"journal":{"name":"Journal of Advanced Science","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84039836","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}
We prepared bismuth telluride (Bi 2 Te 3 ) thin film using radio-frequency magnetron sputtering with different H 2 -Ar gas mixing ratios, and investigated the structural properties of the Bi 2 Te 3 thin films. The deposition rate of the thin films decreased as the mixing ratio was increased because tellurium atoms were lost from the films via the chemical reaction between the tellurium and hydrogen atoms. This phenomenon was supported with the results of the other analyses such as scanning electron microscopy (SEM), electron probe microanalyzer (EPMA), and X-ray diffraction method (XRD). The highest crystallinity was obtained at the H 2 -Ar gas mixing ratio of 5%. When the H 2 gas was introduced, the oxygen concentration near film surface decreased. Therefore, we conclude that the crystallinity and dense structure of Bi 2 Te 3 thin films improved by introducing an optimal amount of hydrogen gas in the sputtering deposition. It can be expected that the electrical conductivity of the thin films improves owing to the enhancement of electron transport.
{"title":"Structural Evaluation of Bi 2 Te 3 Thin Films Prepared by Hydrogen-Argon Mixing Sputtering","authors":"Kousuke Takano, J. Hamada, M. Takashiri","doi":"10.2978/JSAS.30105","DOIUrl":"https://doi.org/10.2978/JSAS.30105","url":null,"abstract":"We prepared bismuth telluride (Bi 2 Te 3 ) thin film using radio-frequency magnetron sputtering with different H 2 -Ar gas mixing ratios, and investigated the structural properties of the Bi 2 Te 3 thin films. The deposition rate of the thin films decreased as the mixing ratio was increased because tellurium atoms were lost from the films via the chemical reaction between the tellurium and hydrogen atoms. This phenomenon was supported with the results of the other analyses such as scanning electron microscopy (SEM), electron probe microanalyzer (EPMA), and X-ray diffraction method (XRD). The highest crystallinity was obtained at the H 2 -Ar gas mixing ratio of 5%. When the H 2 gas was introduced, the oxygen concentration near film surface decreased. Therefore, we conclude that the crystallinity and dense structure of Bi 2 Te 3 thin films improved by introducing an optimal amount of hydrogen gas in the sputtering deposition. It can be expected that the electrical conductivity of the thin films improves owing to the enhancement of electron transport.","PeriodicalId":14991,"journal":{"name":"Journal of Advanced Science","volume":"117 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79882514","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}
Natsumi Morooka, Sayaka Tamura, Kohei Kasuya, K. Tomita
Up-conversion phosphors emit light by excitation of light of which wavelength is longer than that of emission. This phenomena is caused by multi-photon excitation and energy transfer in f orbital of rare earth elements. In this study, BaGd 2 ZnO 5 doped with different amount of Tm and Yb were prepared, and their up-conversion emissions were measured. Main phase of the prepared samples were identified as BaGd 2 ZnO 5 by X-ray diffraction. Up-conversion emissions were measured using multi-channel photo detector and 980 nm diode laser, and the optimum amount of Tm and Yb were 0.3% and 7% respectively for the up-conversion emission. The optimized sample showed blue, red, and near infrared emissions. Excitation power intensity dependence of each emission was investigated by changing the excitation laser power. Blue emission intensity was proportional to the 2.5th power of the excitation, and near infrared emission was proportional to the 1.8th power of the excitation. These results indicate blue up-conversion emission is 3 photon excitation process and near infrared emission is 2 photon excitation process. Quantum efficiency was measured using fluorescence spectrometer equipped with integral sphere. Absorption rate of 980 nm was 22.68%. Internal quantum efficiency of blue emission was 0.02%, and of near infrared was 2.38%.
{"title":"Synthesis and emission properties of Tm, Yb doped BaGd 2 ZnO 5 up-conversion phosphors","authors":"Natsumi Morooka, Sayaka Tamura, Kohei Kasuya, K. Tomita","doi":"10.2978/JSAS.30106","DOIUrl":"https://doi.org/10.2978/JSAS.30106","url":null,"abstract":"Up-conversion phosphors emit light by excitation of light of which wavelength is longer than that of emission. This phenomena is caused by multi-photon excitation and energy transfer in f orbital of rare earth elements. In this study, BaGd 2 ZnO 5 doped with different amount of Tm and Yb were prepared, and their up-conversion emissions were measured. Main phase of the prepared samples were identified as BaGd 2 ZnO 5 by X-ray diffraction. Up-conversion emissions were measured using multi-channel photo detector and 980 nm diode laser, and the optimum amount of Tm and Yb were 0.3% and 7% respectively for the up-conversion emission. The optimized sample showed blue, red, and near infrared emissions. Excitation power intensity dependence of each emission was investigated by changing the excitation laser power. Blue emission intensity was proportional to the 2.5th power of the excitation, and near infrared emission was proportional to the 1.8th power of the excitation. These results indicate blue up-conversion emission is 3 photon excitation process and near infrared emission is 2 photon excitation process. Quantum efficiency was measured using fluorescence spectrometer equipped with integral sphere. Absorption rate of 980 nm was 22.68%. Internal quantum efficiency of blue emission was 0.02%, and of near infrared was 2.38%.","PeriodicalId":14991,"journal":{"name":"Journal of Advanced Science","volume":"57 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84576923","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}
To improve the thermoelectric performance of bismuth telluride (Bi 2 Te 3 ) thin film using electrodeposition, we investigated the effect of electrolyte temperature ranging from 10°C to 70°C. The thermoelectric properties including electrical conductivity, Seebeck coefficient and power factor were measured at room temperature in the in-plane direction. The structural properties were examined by scanning electron microscope and X-ray diffraction analysis. The maximum power factor of 1.3 μW/(K 2 ･ cm) was exhibited at a electrolyte temperate of 20°C. For further increasing the electrolyte temperature, the power factor linearly decreased because both the electrical conductivity and Seebeck coefficient decreased. The surface structure of the Bi 2 Te 3 thin films greatly changed when the electrolyte temperature was changed. The Bi 2 Te 3 thin films at lower electrolyte temperature (T < 30°C) exhibited dense structure while the thin films at higher electrolyte temperature (T > 50°C) exhibited dendrite structure and many deep apertures which caused a decrease in the thermoelectric performance.
{"title":"Structure and thermoelectric properties of electrodeposited bismuth telluride thin films by controlling electrolyte temperature","authors":"M. Yamaguchi, H. Yamamuro, M. Takashiri","doi":"10.2978/JSAS.30102","DOIUrl":"https://doi.org/10.2978/JSAS.30102","url":null,"abstract":"To improve the thermoelectric performance of bismuth telluride (Bi 2 Te 3 ) thin film using electrodeposition, we investigated the effect of electrolyte temperature ranging from 10°C to 70°C. The thermoelectric properties including electrical conductivity, Seebeck coefficient and power factor were measured at room temperature in the in-plane direction. The structural properties were examined by scanning electron microscope and X-ray diffraction analysis. The maximum power factor of 1.3 μW/(K 2 ･ cm) was exhibited at a electrolyte temperate of 20°C. For further increasing the electrolyte temperature, the power factor linearly decreased because both the electrical conductivity and Seebeck coefficient decreased. The surface structure of the Bi 2 Te 3 thin films greatly changed when the electrolyte temperature was changed. The Bi 2 Te 3 thin films at lower electrolyte temperature (T < 30°C) exhibited dense structure while the thin films at higher electrolyte temperature (T > 50°C) exhibited dendrite structure and many deep apertures which caused a decrease in the thermoelectric performance.","PeriodicalId":14991,"journal":{"name":"Journal of Advanced Science","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77451781","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}
Tsubasa Kaneda, Masahito Sugiyama, Yoshihiro Kai, M. Tomizuka
In the design of rehabilitation assist suits, safety consideration for patients is one of the most important issues. We have proposed the basic structure of an ankle joint assist suit with a velocity-based safety device. The velocity-based safety device is intended to stop the assist suit if it detects an unexpected high joint angular velocity. This safety device is designed to work even when the computer breaks down, because it consists of only passive mechanical components without actuators, controllers, and/or batteries. In this paper, we introduce the detailed design of the important parts (motor, gear, torsion spring, encoder, and velocity-based safety device) in the assist suit. First, the design specification of the assist suit is described. Next, the structure of the assist suit is explained. Finally, the detailed design is presented.
{"title":"Development of an ankle joint assist suit with a velocity-based safety device (Detailed design)","authors":"Tsubasa Kaneda, Masahito Sugiyama, Yoshihiro Kai, M. Tomizuka","doi":"10.2978/JSAS.30108","DOIUrl":"https://doi.org/10.2978/JSAS.30108","url":null,"abstract":"In the design of rehabilitation assist suits, safety consideration for patients is one of the most important issues. We have proposed the basic structure of an ankle joint assist suit with a velocity-based safety device. The velocity-based safety device is intended to stop the assist suit if it detects an unexpected high joint angular velocity. This safety device is designed to work even when the computer breaks down, because it consists of only passive mechanical components without actuators, controllers, and/or batteries. In this paper, we introduce the detailed design of the important parts (motor, gear, torsion spring, encoder, and velocity-based safety device) in the assist suit. First, the design specification of the assist suit is described. Next, the structure of the assist suit is explained. Finally, the detailed design is presented.","PeriodicalId":14991,"journal":{"name":"Journal of Advanced Science","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81685027","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}
This paper describes the influence of the observer’s position to the subject during a calculation task. Pulse waves from subject’s earlobe were measured during the calculation task and converted into the heartbeat interval to obtain the Lorenz Plot and the LF/HF for evaluating the subject’s stress. From results, when the observer was sat face to face with the subject, the subject’s stress became lower compared with other observer's positions. However, results of questionnaire investigation indicated that the subject felt the stress when the observer sat at the same position. Further studies need to investigate the difference.
{"title":"The influence of observer’s position to the subject during calculation task","authors":"Yuto Kobayashi, Y. Kageyama","doi":"10.2978/JSAS.30301","DOIUrl":"https://doi.org/10.2978/JSAS.30301","url":null,"abstract":"This paper describes the influence of the observer’s position to the subject during a calculation task. Pulse waves from subject’s earlobe were measured during the calculation task and converted into the heartbeat interval to obtain the Lorenz Plot and the LF/HF for evaluating the subject’s stress. From results, when the observer was sat face to face with the subject, the subject’s stress became lower compared with other observer's positions. However, results of questionnaire investigation indicated that the subject felt the stress when the observer sat at the same position. Further studies need to investigate the difference.","PeriodicalId":14991,"journal":{"name":"Journal of Advanced Science","volume":"109 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89422971","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}
We investigated the structual and thermoelectric properties of electrodeposited Bi 2 Te 3 thin films using a two-step process which combined an homogeneous electron beam irradiation with a thermal annealing. The Bi 2 Te 3 thin films were formed on stainless steel substrates by the potentiostatic electrodeposition. We first performed only the thermal annealing to the thin films to determine the optimal annealing temperarure. As a result, we found that the Bi 2 Te 3 thin films at the annealing temperautre of 300 °C exhibited the highest thermoelectric performance, which was 4.5 times higher than that of the as-deposited thin films. Thus, in the two-step process, the electron beam irradiation dose was changed from 0.36 to 1.08 MGy while the annealing temperature was set at 300°C. As a result, the Bi 2 Te 3 thin films at the EB irradiation dose of 0.36 MGy exhibited highest thermoelectric properties [power factor = 6.1 μW/(cm·K 2 )] which was approximately 20% higher than that of the optimized thin films with only the annealing treatment. Therefore, we conclude that two-step process is beneficial to improve the thermoelectric properties of electrodeposited Bi 2 Te 3 thin films.
{"title":"Performance improvement of electrodeposited Bi 2 Te 3 thin films using homogeneous electron beam irradiation and thermal annealing","authors":"Akito Kawahira, H. Yamamuro, M. Takashiri","doi":"10.2978/JSAS.30103","DOIUrl":"https://doi.org/10.2978/JSAS.30103","url":null,"abstract":"We investigated the structual and thermoelectric properties of electrodeposited Bi 2 Te 3 thin films using a two-step process which combined an homogeneous electron beam irradiation with a thermal annealing. The Bi 2 Te 3 thin films were formed on stainless steel substrates by the potentiostatic electrodeposition. We first performed only the thermal annealing to the thin films to determine the optimal annealing temperarure. As a result, we found that the Bi 2 Te 3 thin films at the annealing temperautre of 300 °C exhibited the highest thermoelectric performance, which was 4.5 times higher than that of the as-deposited thin films. Thus, in the two-step process, the electron beam irradiation dose was changed from 0.36 to 1.08 MGy while the annealing temperature was set at 300°C. As a result, the Bi 2 Te 3 thin films at the EB irradiation dose of 0.36 MGy exhibited highest thermoelectric properties [power factor = 6.1 μW/(cm·K 2 )] which was approximately 20% higher than that of the optimized thin films with only the annealing treatment. Therefore, we conclude that two-step process is beneficial to improve the thermoelectric properties of electrodeposited Bi 2 Te 3 thin films.","PeriodicalId":14991,"journal":{"name":"Journal of Advanced Science","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75106576","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}
It is assembled by a plurality of parts, and an easy screw end method is mainstream, and the resolution after at the time of assembling and the assembling is used for an electric appliance and a car, an airplane, a train, the machine tool in that by the various joining method. However, because external force such as vibration and the repetition load acts on the join of the screw, the screw loses a conclusion power, and the slack occurs. This phenomenon causes a serious accident to give material and human damage. In contrast, it is dealt by the slack laboratory procedure of various screws, but lower unevenness and reliability of the measured value, the inspection that let you maintain proofreading and a conclusion state of the screw head again have a problem that it is difficult, and there is not the laboratory procedure that is simple and easy and highly precise in the present conditions. Therefore, in this study, I report it because I studied the slack of the screw which occurs because a spindle is lost by external force for the purpose of the detection of the slack and a thing judging more easily than the method and exactly in before.
{"title":"Study of new screw loosening inspection system using ultrasound","authors":"Kohei Okamichi, Takashi Watanabe, Seiki Murayama","doi":"10.2978/JSAS.30104","DOIUrl":"https://doi.org/10.2978/JSAS.30104","url":null,"abstract":"It is assembled by a plurality of parts, and an easy screw end method is mainstream, and the resolution after at the time of assembling and the assembling is used for an electric appliance and a car, an airplane, a train, the machine tool in that by the various joining method. However, because external force such as vibration and the repetition load acts on the join of the screw, the screw loses a conclusion power, and the slack occurs. This phenomenon causes a serious accident to give material and human damage. In contrast, it is dealt by the slack laboratory procedure of various screws, but lower unevenness and reliability of the measured value, the inspection that let you maintain proofreading and a conclusion state of the screw head again have a problem that it is difficult, and there is not the laboratory procedure that is simple and easy and highly precise in the present conditions. Therefore, in this study, I report it because I studied the slack of the screw which occurs because a spindle is lost by external force for the purpose of the detection of the slack and a thing judging more easily than the method and exactly in before.","PeriodicalId":14991,"journal":{"name":"Journal of Advanced Science","volume":"70 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80300022","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}
With the increment of installation density, the PV power generation system may encounter the external interference contributed by unpredictable variation of irradiance. Especially, the partial shadow, as one of main factors that lead to the problem of low conversion efficiency ought to be taken into consideration. This paper presents a novel maximum power point tracking method proposed in order to make sufficient utilization of solar energy, on the occasion when the photovoltaic modules are partially shaded. The novel method is based on Perturbation and Observation (P&O) method, with which the scan method is combined periodically. By using this method, the maximum power point can be checked out within transient period. For the purpose of verifying practicality of this novel method, simulation, as well as experiment have been carried out under the same circumstances, respectively. The consequences intuitively indicate that the conversion efficiency operated by proposed method is substantially improved under partial shadow.
{"title":"Novel maximum power point tracking method for improving efficiency of photovoltaic generation system under partial shadow","authors":"Shuai Yang, K. Itako, Y. Takeda, Q. Ge","doi":"10.2978/JSAS.30101","DOIUrl":"https://doi.org/10.2978/JSAS.30101","url":null,"abstract":"With the increment of installation density, the PV power generation system may encounter the external interference contributed by unpredictable variation of irradiance. Especially, the partial shadow, as one of main factors that lead to the problem of low conversion efficiency ought to be taken into consideration. This paper presents a novel maximum power point tracking method proposed in order to make sufficient utilization of solar energy, on the occasion when the photovoltaic modules are partially shaded. The novel method is based on Perturbation and Observation (P&O) method, with which the scan method is combined periodically. By using this method, the maximum power point can be checked out within transient period. For the purpose of verifying practicality of this novel method, simulation, as well as experiment have been carried out under the same circumstances, respectively. The consequences intuitively indicate that the conversion efficiency operated by proposed method is substantially improved under partial shadow.","PeriodicalId":14991,"journal":{"name":"Journal of Advanced Science","volume":"86 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84767287","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}
T. Inoue, Toshitaka Tsugane, H. Kuwahata, Yoshiki Oda
The decolorization of tar dye aqueous solution by the irradiation of an atmospheric-pressure plasma jet was examined by absorbance spectrum measurement and nuclear magnetic resonance (NMR) and mass spectrometry (MS) analyses. An atmospheric-pressure argon (Ar) plasma jet was generated at a frequency of 10 kHz with an applied voltage of 10 kV and an Ar gas flow rate of 10 L/min. When 10 mL of 100 mg/L tartrazine aqueous solution was irradiated with this plasma jet, the yellow solution gradually became lighter with increasing irradiation time and was almost completely decolorized after 50 min of irradiation. In addition, the results of MS analysis revealed that tartrazine molecules with a mass-to-charge ratio ( m / z ) of 579 were decomposed mainly into unidentified substances with m / z = 271. This result indicated that the decolorization was caused by the destruction of the azo bond in the tartrazine molecules.
{"title":"Decolorization of tar dye aqueous solution by atmospheric-pressure plasma jet","authors":"T. Inoue, Toshitaka Tsugane, H. Kuwahata, Yoshiki Oda","doi":"10.2978/JSAS.30107","DOIUrl":"https://doi.org/10.2978/JSAS.30107","url":null,"abstract":"The decolorization of tar dye aqueous solution by the irradiation of an atmospheric-pressure plasma jet was examined by absorbance spectrum measurement and nuclear magnetic resonance (NMR) and mass spectrometry (MS) analyses. An atmospheric-pressure argon (Ar) plasma jet was generated at a frequency of 10 kHz with an applied voltage of 10 kV and an Ar gas flow rate of 10 L/min. When 10 mL of 100 mg/L tartrazine aqueous solution was irradiated with this plasma jet, the yellow solution gradually became lighter with increasing irradiation time and was almost completely decolorized after 50 min of irradiation. In addition, the results of MS analysis revealed that tartrazine molecules with a mass-to-charge ratio ( m / z ) of 579 were decomposed mainly into unidentified substances with m / z = 271. This result indicated that the decolorization was caused by the destruction of the azo bond in the tartrazine molecules.","PeriodicalId":14991,"journal":{"name":"Journal of Advanced Science","volume":"78 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75525765","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}
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