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有線/無線ネットワークと電力線搬送通信環境におけるエンド―エンド間のTCP通信性能の向上技術に関する研究
Get PDF九州工業大学博士学位論文（要旨） 学位記番号:情工博甲第300号 学位授与年月日:平成27年3月25
セメント型生体材料への生体活性化処理
Get PDF九州工業大学博士学位論文 学位記番号:生工博甲第234号 学位授与年月日:平成27年3月25日1. General introduction||2. The investgation of bioactivity and mechanical proporties of glassionomer cement prepared by sio2-al2o3-cao system and poly(γ-glutamic acid)||3. Modification with calcium acetate and phosphoric acid 2- hydroxyethyl methacrylate ester to provide pmma bone cement with bioactivity in simulated body environment||4. Modification of calcium acetate and bis [2-(methacryloyloxy) ethyl] phosphate to provide pmma bone cement with bioactivity in simulated body environment||5. General conclusion
Proposal for New Hearth Roller Consisting of Ceramic Sleeve and Steel Shafts Used in the Heat Treat Furnace
No full textConventional rollers used in a heat furnace are called hearth roll. They must be changed very frequently since high temperature of the furnace induces wear on the roll surface in short period. This paper there-fore discusses a new roller structure consisting of ceramic sleeve and steel shaft connected by shrink fitting. Although all ceramic sleeve has high temperature resistance and high corrosion resistance, attention should be paid for the risk of fracture due to the thermal expansion of the steel shaft that is much larger than the one of ceramic. Simple double cylinder simulation suggests that thinner structure is useful for reducing thermal stress. The finite element analysis shows that tapered shaft thickness is desirable for the ceramics hearth roller. Finally, an application of ceramic roller to steel manufacturing machinery is considered by changing geometry and material. Since only low shrink fitting ratio can be applied to the new roller, failure analysis is also considered for preventing the coming out of the shaft from the ceramic sleeve
メタル細線をバックコンタクト電極に用いた透明導電膜を必要としない色素増感太陽電池の作製と光電変換特性
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244号 学位授与年月日:平成27年9月25日1: INTRODUCTION||2: INSTRUMENTATION & CHARACTERIZATION||3: NOVEL TCO-LESS COIL TYPE CYLINDRICAL DYE SENSITIZED SOLAR||4: INVESTIGATION OF TI WIRE BASED TCO-LESS CYLINDRICAL SOLAR CELLS CELLS||5: INDOOR LIGHT APPLICATION OF COIL TYPE CYLINDRICAL DYE SENSITIZED SOLAR CELL UTILIZING REFLECTORS||6: GENERAL CONCLUSIONSDye-sensitized solar cells (DSSCs) are now able to enter in to the commercialization stage after
the profound researches carried over the past two decade after their successful inception in 1991.
Some of the possible reasons for the popularity are their low cost of production, short energy
payback time (EPBT), simple methods of fabrication and possibilities of fabricating on the
flexible substrates. Cost of the solar cell is an important factor in implementing the DSSC’s use
at the mass consumer level having mainly three possible ways to decrease the overall cost. One
approach is to design the dyes with high molar extinction coefficient such as organic dyes or to
increase the absorption range of the dyes for example black dye, which increases the DSSC
efficiency or output power. Second one is to increase the life-time of DSSC, which can be done
by improving the dye stability, proper sealing of DSSC and replacing the corrosive redox
electrolyte. Third approach is to decrease the cost of materials implemented for DSSC
fabrication such as designing the cheap dye material, removal of costly transparent conductive
oxide (TCO) and costly catalytic Pt etc. TCO glass is one of the expensive elements in
conventional DSSC architecture. In this step, past researches for the removal of TCO have been
done. Back contact TCO-less DSSC using metal mesh have been reported by our group. Further
the back contact TCO-less cylindrical DSSC architecture was reported using metal mesh owing
to advantage of uniform solar harvesting from all directions, higher total output power in a day
compared to flat conventional DSSC, easy to carry and install. The fabrication process involved
in the cylindrical DSSC is a bit cumbersome and need simplification for the commercial
exploitation. Therefore, the goal of my current research was to develop a new cylindrical
architecture for DSSC which could solve some of the previously existing problems in cylindrical
DSSC architectures. In this report, I will discuss mainly the following points.
(1) Different flexible metal wires such as Copper (Cu), Stainless-Steel (SS) and Titanium (Ti)
were employed to fabricate the novel cylindrical DSSC and we gave it a name as coil type
cylindrical DSSC (C-DSSC). The fabrication steps involved were fast and easy. We have
shown that the nature of the wire plays an important role on the performance of the solar
cells. The effect of surface passivation on the metal wire surface with a thin layer of Ti
was discussed. Electrochemical Impedance spectroscopy (EIS) analyses were done to
investigate about the differential performance of the solar cell using different metal wires.
(2) Relatively lower resistance, good flexibility, superior corrosion resistance and high
temperature tolerance of Ti wire make it a better choice for C-DSSC. Here we presented
the comparative study of the photovoltaic characteristics of the solar cells prepared with
Ti wires having different diameters. The Ti wire surface was modified using hydrogen
peroxide (H2O2). This surface treatment have been found to influence the adhesion as well
as electrical contact between coated nanoporous titanium oxide (TiO2) and Ti-wires. The
results were supported by X-ray diffraction (XRD), X-ray photoelectron spectroscopy
(XPS) and scanning electron microscopy (SEM).
(3) Diffused light performance is one of the application areas of DSSC where they can
outperform to their inorganic solar cell counterparts. In this part we investigated the 1
SUN and low light intensity fluorescent light performance of Ti wire based C-DSSC using
ruthenium based N719 dye and organic dyes such as D205 and Y123. The cylindrical
geometry gives an advantage above flat conventional DSSC i.e. it allows to use the
reflectors to further enhance the output power. Therefore, we used different parabolic
reflectors to tap diffused light for indoor applications. Effect of shape and size of the
reflector geometry on the C-DSSC performance was also investigated. Optical simulation
software Trace Pro 7.5.1 was also used to analyze the spectral distribution on the TiO2
surface
A Web-based Application for Writing Novels
Get PDFKnowledge-Based and Intelligent Information & Engineering Systems 19th Annual Conference, KES-2015, Singapore, September 2015 ProceedingsIn this paper, we propose a method for assisting amateur writers in novel writing. Amateur writers can publish their work intensively through web infrastructures. This situation is beneficial, because it encourages amateur writers to enhance their skills by sharing their work. However, writing a good novel is difficult for a novice, because the novel-writing task requires the management of many character settings and maintenance of consistency throughout the novel. The length of a novel increases the difficulty of the task and decreases motivation owing to cumbersome management tasks. To reduce the burden, we introduce automatic keyword suggestion and highlighting techniques. Automatic keyword suggestion finds names of characters from the draft text and proposes their addition to the character list. The character names in the list are automatically linked to the corresponding words in the draft text. Using such functions, amateur writers can easily check the consistency of their novels while writing, similar to the use of an integrated development environment for software development. We have implemented a web application that provides the functions, and we consider the effectiveness of the proposed method here
Relationship between Microstructure and Magnetic Domain Structure of Nd-Fe-B Melt-Spun Ribbon Magnets
Get PDFThe relation between the microstructure, observed using an electron probe microanalyzer, and the domain structure, observed using a Kerr microscope, was established to evaluate the effects of hot rolling and the addition of Ti-C on the c-axis orientation and the magnetization process of hot-rolled Nd-Fe-B-Ti-C melt-spun ribbons. The addition of Ti-C promotes the c-axis orientation and high coercivity in the ribbons. Elemental mapping suggests a uniform elemental distribution; however, an uneven distribution of Ti was observed in an enlarged grain with Ti-enriched points inside the grain. The reversal domains that nucleated at the Ti-enriched point inside the grain cause low coercivity
Evaluation of Stress Intensity Factor for Small Edge Interface Crack under Thermal Stress
Get PDFThis paper deals with the analysis of the thermal stress intensity factor for small edge interfacial crack between bonded dissimilar plates subjected to uniform change of temperature by using the crack tip stress method. The stress intensity factor of edge interface crack is strongly controlled by the singular stress field at the interface edge of the bonded plates without the crack when the crack becomes extremely short. In this study, the small edge interface crack problem under thermal stress is solved by superposing the uniaxial tension problem with edge singularity and the uniform stress problem having the boundary condition of temperature change and uniaxial compression. The calculation shows that the stress intensity factors of the small edge interface crack under thermal stress can be evaluated from four factors related only to the Dundurs' parameters α and β. In addition, the expression of the stress intensity factor for the small edge interface crack under the logarithmic edge singularity is presented when the material combination is α=2β
3D Numerical Simulation of Hair Formation Process Using a Particle Model
Get PDFHair is very important in determining human appearance. Although there are numerous observed data and experimental recordings for hair, a detailed mechanism of hair formation has not yet been elucidated. Therefore, in this study, a simulation of the method of formative process of hair roots was done using a 3D particle model. The model contains details of the cell growth from the hair matrix cells and changes from spherical to non-spherical oval shape. Simulation results were able to exhibit the hair formation process from the base of the hair follicle. Furthermore, at the surface opening of the follicle, the hair structure was recorded. Therefore, this model can be used to clarify the mechanism of hair root formation