Journal of Advanced Science

Paper

太陽光発電システムにおけるPlug-inリアルタイムホットスポット検出システムのPVピークブリッジ法への適用

Naoaki IIDUKA, Kazutaka ITAKO, Masataka OCHIAI, Bakhsh HOSSAM

2017 年 29 巻論文ID: 29101
発行日: 2017年
公開日: 2017/09/08

DOIhttps://doi.org/10.2978/jsas.29101

ジャーナルフリー

抄録を表示する抄録を非表示にする

Currently, the production and installation quantity of photovoltaic modules is has been increasing rapidly. Meanwhile, the failure cases are also increasing. Accordingly, many failures are results of the Hot-Spot phenomenon. This is a phenomenon in which the entire or part of the defective cell becomes hot when shadow occurs on the cell for a long period. In severe cases, the phenomenon causes breaking of the cell and a fire. While there are many Hot-Spot inspection methods, such as using infrared cameras, the inspection instruments of these methods are expensive, and these methods also require a lot of time and effort during the inspection. Previously, the authors proposed a Hot-Spot detection system included into PCS. In this paper, we proposed plug-in type Hot-Spot detection system, and report about effectiveness of the system.

抄録全体を表示

PDF形式でダウンロード (750K)
食品廃棄物の農業利用の可能性について:コーヒー粕抽出液がコマツナの生育に及ぼす影響

Anna ISHIZUKA, Keiko ISHIHARA, Kenichi MUROTA

原稿種別: Paper
2017 年 29 巻論文ID: 29102
発行日: 2017年
公開日: 2017/12/24

DOIhttps://doi.org/10.2978/jsas.29102

ジャーナルフリー

抄録を表示する抄録を非表示にする

Many food wastes dispose from mainly developed countries including Japan, on the other hand a drain of phosphatic fertilizer is an issue of sustainable agriculture. Here we investigated effective utilization of the food wastes for agriculture, and focused on coffee grounds which is disposed of in a large quantity and difficult to reuse. It is difficult to use the coffee grounds for agricultural materials (ex; fertilizer, soil conditioner), because the coffee grounds are high carbon to nitrogen (C/N) ratio and contains a kind of plant growth inhibitor. Hence, the water (coffee grounds extract) stained out coffee grounds was used. Japanese mustard spinach (Brassica rapa var. prviridis) growth (fresh weight, dry weight and shoot length) was enhanced by applying the coffee grounds extract, and the growth ratio was almost same as plants applied commercial liquid fertilizer. We therefore suggest that the coffee grounds extract may use fertilizer in agriculture.

抄録全体を表示

PDF形式でダウンロード (623K)
航空機用CFRP/Al積層体の窒素雰囲気における最適酸素分圧の電子線照射誘起接着

Daisuke KITAHARA, Akiko MINEGISHI, Takahiro H. UCHIDA, Masae KANDA, No ...

原稿種別: Paper
2017 年 29 巻論文ID: 29103
発行日: 2017年
公開日: 2018/01/29

DOIhttps://doi.org/10.2978/jsas.29103

ジャーナルフリー

抄録を表示する抄録を非表示にする

Adhesion induced by homogeneous low voltage EB-irradiation (HLEBI) under O₂ partial pressure from 0.02 mol% to 20 mol% in N₂ gas atmosphere of CFRP/Al lamination has been successfully developed. Its adhesive tensile shear strength of CFRP/Al with 0.30 MGy-HLEBI under optimal O₂ partial pressure in N₂ atmospher of 0.2 mol% is 8.2 MPa, which is about 1.4 times higher than that (5.9 MPa) of CFRP/Al untreated.

抄録全体を表示

PDF形式でダウンロード (619K)
めっき法で作製したP型アンチモン・テルル薄膜の熱処理と拡散防止膜の導入による高性能化

Tomomi HARADA, Yusuke SASAKI, Mitsuaki OKUHATA, Masayuki TAKASHIRI

原稿種別: Paper
2017 年 29 巻論文ID: 29104
発行日: 2017年
公開日: 2017/12/24

DOIhttps://doi.org/10.2978/jsas.29104

ジャーナルフリー

抄録を表示する抄録を非表示にする

We investigated the thermoelectric properties of electrodeposited Sb-Te thin films using thermal annealing and incorporating diffusion barrier layer between the stainless steel substrate and the Sb-Te thin film. Molybdenum (Mo) and nickel (Ni) films were used as a diffusion barrier layer. Surface morphology was observed by scanning electron microscope, and crystallographic characteristic was examined by X-ray diffraction analysis. In-plane thermoelectric properties, in terms of the electrical conductivity, Seebeck coefficient and power factor, were measured at room temperature. It was found that Sb-Te thin film with Mo layer exhibited higher thermoelectric performance compared to that of Sb-Te thin film with no diffusion barrier layer. This is because the impurity atoms from the substrate and Mo layer itself did not diffuse so much into Sb-Te layer. On the other hand, Sb-Te thin film with Ni layer exhibited the lower thermoelectric properties owing to the diffusion of Ni atoms into the Sb-Te thin film. Therefore, incorporation of Mo layer is beneficial to improve the thermoelectric properties of Sb-Te thin films by thermal annealing.

抄録全体を表示

PDF形式でダウンロード (849K)
ハードウェアベース安全装置を搭載した足関節用アシストスーツの開発 (品質機能展開を用いた設計)

Masafumi YABE, Souhei NOGUCHI, Masahito SUGIYAMA, Keisuke IKEDA, Tsuba ...

2017 年 29 巻論文ID: 29105
発行日: 2017年
公開日: 2017/11/18

DOIhttps://doi.org/10.2978/jsas.29105

ジャーナルフリー

抄録を表示する抄録を非表示にする

When developing rehabilitation assist suits, safety consideration for patients is one of the most important issues. In this paper, we propose an ankle joint assist suit with a velocity-based safety device and a commercial torque limiter. The velocity-based safety device switches off the assist suit’s motor if it detects an unexpected high joint angular velocity. The torque limiter cuts off the torque transmission if it detects an unexpected high joint torque. These devices work even when the assist suit’s computer breaks down, because they consist of only passive mechanical components without actuators, controllers, or batteries. First, we describe the design requirements for this assist suit. Next, we clarify the relationship between the design requirements and the assist suit parts by using Kato’s multispace-quality function deployment (M-QFD). Finally, we present the assist suit design incorporating this relationship.

抄録全体を表示

PDF形式でダウンロード (1022K)
炭素繊維を用いたTi/ポリカーボネート接合体の成型方法と強度に関する研究

Yuichi ENOMOTO, Hitoki HASEGAWA, Masae KANDA, Yoshihito MATSUMURA, Yos ...

原稿種別: Paper
2017 年 29 巻論文ID: 29106
発行日: 2017年
公開日: 2018/09/05

DOIhttps://doi.org/10.2978/jsas.29106

ジャーナルフリー

抄録を表示する抄録を非表示にする

A joint between the carbon fibers (CF) reinforced thermoplastic polycarbonate and titanium (Ti) with extremely large friction force induced by the broad fiber interface was successfully prepared by using both electron beam melting process to wrap one side of the CF into the Ti and hot-press under air to wrap the other side of CF into polycarbonate (PC). The joint tensile strength was higher than those of glue and spontaneous joints without fiber, and then exhibited the extremely high safety level.

抄録全体を表示

PDF形式でダウンロード (714K)
人工血管用フッ素樹脂と電子線照射表面活性化したPF積層複合材料の接着剥離強度の研究

Arata YAGI, Sagiri TAKASE, Masae KANDA, Noriyuki INOUE, Takahiro UCHID ...

原稿種別: Paper
2017 年 29 巻論文ID: 29107
発行日: 2017年
公開日: 2018/09/05

DOIhttps://doi.org/10.2978/jsas.29107

ジャーナルフリー

抄録を表示する抄録を非表示にする

An optimal condition to improve the adhesion of PTFE/PE lamination of Polytetraﬂuoroethylene (PTFE) untreated and Polyethylene (PE) activated by homogeneous low voltage electron beam irradiation (HLEBI) under each O₂ partial pressure in N₂ gas atmosphere prior to hot-press was studied. Its adhesive force of PTFE/PE with 0.22 MGy-HLEBI under optimal O₂ partial pressure (20000 ppm) in protective N₂ atmosphere was 14.6 N/m, which was about 2.2 times higher than that (6.7 N/m) of PTFE/PE with 0.22 MGy-HLEBI under low O₂ partial pressure (200 ppm) in N₂.

抄録全体を表示

PDF形式でダウンロード (957K)

J-STAGEへの登録はこちら（無料）