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A Method to Extract Failure for Quality Improvement in Embedded Systems
No full text九州工業大学博士学位論文 学位記番号:情工博甲第274号 学位授与年月日:平成25年3月25日第1章 序論||第2章 障害分析の重要性と必要要件||第3章 既存の障害分析手法と先行研究||第4章 分析対象の概念モデル||第5章 逸脱要因の抽出||第6章 非正常系分析マトリクス||第7章 障害分析手法ESIM||第8章||第9章 適用実験||第10章 まとめ||第11章 今後の課
酸化亜鉛前駆体を利用するバルクヘテロ接合太陽電池
No full text九州工業大学博士学位論文 学位記番号:生工博甲第208号 学位授与年月日:平成25年9月27日1.Introduction||2.Materials,instrumentation and methods||3.Study of fabrication techniques for polymeric bulk hetero-junction solar cell||4.Controlling the processable ZnO and polythiophene interface for polymer hybrid bulk hetero-junction solar cells||5.Single step fabrication of dye-sensitized polymeric hybrid bulk hetero-junction solar cells using solution processable precursor||6.ConclusionDye-sensitized solar cells (DSSCs) have emerged as one of the low-cost solar cells, due to the ease of their fabrication by printing processes under ambient conditions. Recently, all-solid DSSCs having solid hole-transport layers (HTL) instead of the liquid electrolyte have been studied to avoid the complicated encapsulation of DSSCs to protect the evaporation of the liquid electrolyte. Solid state DSSCs consisting of the inorganic Electron transport layer (ETL)/dye/HTL are generally fabricated multiple step process namely, fabrication of a nano porous TiO_2 layer, sintering, dye adsorption, and fabrication of a HTL. Although, this step-by-step process is a convenient way to control photo-conversion interfaces, but it's costly and time consuming. Dye-sensitized polymeric bulk hetero-junction solar cells (DSPSC) are another class of low cost, easily processable solar cells that can be prepared by a single step coating process. In the DSPSC solar cells a mixture of dye, donor and acceptor materials are mixed in common solvent and then coated on to the substrate in single step process. The working principal and structure of DSPSC and solid-state DSPSC are much similar. However, the only difference between them is the class of acceptors used. DSPSC generally uses organic acceptors (like fullerene derivatives), whereas all solid DSSC have inorganic metal oxides such as TiO_2, ZnO as electron acceptors. For single step fabrication of all solid-DSSC using DSPSC fabrication method, first there is need for solution processable inorganic oxide, which along with dye and polymeric HTL is soluble in a common solvent. First step for fabrication would be successfully fabricating binary polymeric hybrid bulk hetero-junction (PHSC) solution processable inorganic oxide and polymeric. Thereafter this fabrication approach would be extended for fabricating dye sensitized PHSC, which has same material components as that of all solid DSSC. This thesis explores and demonstrates the way for single-pot fabrication process of all-solid DSSCs using a DSPHSC fabrication method
Fatigue Strength Analysis for Bolts and Nuts Which Have Slightly Different Pitches Considering Clearance
No full textThe fatigue strength of bolt and nut is experimentally investigated for three types of different pitch difference. The effect of fitting clearance on the strength of bolt is discussed as well as the effect of pitch difference. The conclusions are summarized as follow : (l)By introducing the pitch difference, the mean stress and stress amplitude can be reduced at the first root of bolt thread. (2)The fracture pos北ion of bolt thread is changed depending on the pitch difference. (3)The clearance affects the stress distribution along threads more significantly when the pitch difference is larger
Study on vibration and stability of functionally graded cylindrical shells subjected to hydrostatic pressure
Get PDFBased on the Flügge’s shell theory, the vibration characteristics and stability of submerged
functionally graded (FG) cylindrical shell under hydrostatic pressure is examined. By means of conversion
switch on axial wave number, the coupled frequency of submerged FG cylindrical shell with various
boundary conditions is obtained, using wave propagation method and Newton method. Then the critical
pressure of FG cylindrical shells is given by applying linear fitting method. Results are compared to known
solutions, where these solutions exist. The natural frequency and critical pressure of FG cylindrical shell are illustrated. The effects of constituent materials, volume fraction, boundary condition and dimensions on the natural frequencies and critical pressures of submerged FG cylindrical shell are illustrated by examples
IGBT chip current imaging system by scanning local magnetic field
Get PDF電子デバイス/半導体電力変換合同研究会, 10月21日-22日, 2013年, 大阪大学 銀杏会館, 大阪府This paper develops an imaging system for current distribution on chips of a power device ncluding an IGBT. The system is useful for finding current concentration that may cause a failure of the power device. This paper uses very thin and very compact, mass producible at low cost, micro-film sensor that can be measured non-destructive and non-contact, 4-axis robot, analog amplifier, digitizer, a function generator. It integrates with LabVIEW on the whole system, the measurement can be performed automatically