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カイラル磁性体Cr1/3NbS2におけるカイラルソリトン格子状態の精密磁気測定
Full text link九州工業大学博士学位論文（要旨）学位記番号：工博甲第418号 学位授与年月日平成28年3月25
マレーシア・スリ・ケンバンガンのレストランのまな板上の菌叢解析と食中毒菌の増殖に関係する要因の検討に関する研究
Full text link九州工業大学博士学位論文（要旨）学位記番号：生工博甲第258号 学位授与年月日平成28年3月25
Surface Modiffication of Ti-6Al-4V Alloy by YAG Laser
No full text九州工業大学博士学位論文 学位記番号:工博甲第416号 学位授与年月日:平成28年3月25日第1章 緒論||第2章 レーザ照射法によるTi-6Al-4V 合金表面へのTi(C,N)薄膜の形成||第3章 レーザ溶融法によるTi-6Al-4V 合金表面へのTi(C,N)/TiB 層の形成||第4章 レーザ溶融法によるTi-6Al-4V 合金表面へのTi(C,N)層の形成||第5章 表面改質層の耐摩耗性及び生体適合性の評価||第6章 総
Studies on Surface Chemical Reaction of Metal Powder for Soldering in Packaging Technology
No full text九州工業大学博士学位論文 学位記番号:工博甲第417号 学位授与年月日:平成28年3月25日第1章 序論||第2章 錯体被膜形成インジウムボールとその形状変化||第3章 PoP用スペーサー銅ボールのセルフアライメント性制御||第4章 ソフトエラー対策と次世代実装用低α線量材料||第5章 総
Microbial Community Analysis of Restaurant Cutting Boards in Seri Kembangan，Malaysia and the Identification of Factors Associated with Foodborne Bacteria Growth
Full text link九州工業大学博士学位論文 学位記番号:生工博甲第258号 学位授与年月日:平成28年3月25日1: INTRODUCTION||2: LITERATURE REVIEW||3: MATERIALS AND METHODS||4: ANALYSIS OF MICROBIAL COMMUNITY AND FOODBORNE PATHOGENIC BACTERIA AND THEIR CORRELATION WITH GRADES OF FOOD PREMISES||5: ECOLOGICAL RELATIONSHIP OF MICROBIAL COMMUNITY AND FACTORS ASSOCIATED WITH THE PRESENCE OF FOODBORNE BACTERIA||6: CONCLUDING REMARKS, AND RECOMMENDATIONS FOR FUTURE RESEARCHFoodborne diseases have been associated with microorganisms like bacteria,
fungi, viruses and parasites. Most commonly, the outbreaks take place due to the
ingestion of pathogenic bacteria like Salmonella typhi, Escherichia coli,
Staphylococcus aureus, Vibrio cholerae, Campylobacter jejuni, and Listeria
monocytogens. The disease usually happens as a result of toxin secretion of the
microorganisms in the intestinal tract of the infected person. Usually, the level of
hygiene in the food premises reflect the quality of the food item, hence restaurant
or stall with poor sanitary condition is said to be the contributor to food poisoning
outbreak. In Malaysia, food poisoning cases are not rare because the hot and
humid climate of this country is very suitable for the growth of the foodborne
bacteria, thus the government implements strict rules to ensure workers and
owners of food premises prioritize the cleanliness of their working area. Studies of
food safety are important, and the results can give information about the types of
microorganisms, and factors that affect their growth. The result is crucial to
determine how the spread of foodborne bacteria can be controlled safely and the
outbreak can be reduced.
This study adopts the pyrosequencing technique to identify bacteria present on 26
kitchen cutting boards collected from different grades of food premises around
Seri Kembangan, Malaysia. The analysis generated 452,401 of total reads of
OTUs with an average of 1.4 × 107 bacterial cells/cm2. Proteobacteria, Firmicutes
and Bacteroidetes were identified as the most abundant phyla in the samples.
Taxonomic richness was generally high with >1000 operational taxonomic units
(OTUs) observed across all samples. The highest appearance frequencies (100%)
were OTUs closely related to Enterobacter sp., E. aerogenes, Pseudomonas sp.
and P. putida. Several OTUs were identified most closely related to known
foodborne pathogens including Bacillus cereus, Cronobacter sakazaki, C.
turisensis, Escherichia coli, E. coli O157: H7, Salmonella bongori, S. enterica, S.
paratyphi, S. typhi, S. typhimurium and Yersinia enterocolitica ranging from 0.005-
0.68% relative abundance. The condition and grade of the food premises on a
three-point cleanliness scale did not correlate with the bacterial abundance and
type. To add, the community composition of FBB based on premise grades also
showed no similarity. Regardless of the status and grades, all food premises have
the same likelihood to introduce foodborne bacteria from cutting boards to their
foods and must always prioritize the correct food handling procedure, in order to
avoid an unwanted outbreak of foodborne illnesses.
This study further analyzes the effect that might be created by other
microorganisms in order to support or suppress the number of pathogenic bacteria.
The analysis found that high bacteria group contains a low percentage of FBB
compared to low bacteria group. The results also showed that although premise
grade C contains significantly higher numbers of overall bacteria, it did not
influence the number of FBB. The combinations of Clostridiales, Flavobacteriales,
and Lactobacillales in the high bacteria group were found to have significant
negative associations with FBB. Despite the finding that Citrobacter, Enterobacter,
Erwinia, Klebsiella and Pantoea had significant positive correlation with FBB, the
population of these bacteria was small. This study suggested that high
background biota and a combination of different bacteria have an advantage in
preventing FBB from reaching the infectious dose level thus, considered harmless
自己組織化による界面現象の解析と高機能界面構築に関する研究
Full text link九州工業大学博士学位論文 学位記番号:生工博甲第255号 学位授与年月日:平成28年3月25日第1章 序論||第2章 HFBI 自己組織化膜の構造解析及びその膜が及ぼす液滴界面現象の解明||第3章 HFBI 液滴についての研究||第4章 HFBI 自己組織化膜で被覆した電極の電気化学特性||第5章 HFBI 自己組織化膜をテンプレートとした微小金属結晶の構築||第6章 結
The Study of Solving the Problem Having Multiple Search Spaces by Hierarchical Optimize Method Based on the Competitive
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266号 学位授与年月日:平成28年3月25日第1章 序論||第2章 問題設定と関連手法||第3章 複数解空間競合型分散GAの提案と多項式曲線フィッティングによる検証||第4章 階層的複数解空間競合型分散GAの提案と階層的な組み合わせ最適化問題への適用||第5章 結
透明導電膜を必要としないタンデム型色素増感太陽電池の構造最適化と効率の向上
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253号 学位授与年月日:平成28年3月25日1:Introduction||2:Experimental section for optical and photovoltaic property||3:Fabrication and characterization of TCO-less Tandem DSSCs||4:TCO-less back contact Tandem DSSCs having extended wavelength photon harvesting||5:Conclusions and future prospectsExtensive use of fossil fuels to circumvent our current energy needs and their limited availability along with climate change due to greenhouse effect lead to the serious thinking about the logical implementation of renewable energy resources. Photovoltaic technologies enables us the direct utilization of solar energy in the form of electrical energy. The clean energy generation using renewable energy resource must be accomplished considering the cost effectiveness with existing power generating technologies. Dye sensitized solar cells (DSSCs), kind of excitonic solar cells have attained the rampant popularity among the existing solar cells due to its ease of fabrication and cost effective nature. DSSCs have achieved comparable photoconversion efficiency as that of amorphous Si solar cell and are on the verge of commercialization. Apart from focus being directed to achieve the cost effectiveness and stability, further enhancement in the power conversion efficiency is inevitable to compete with traditional silicon based solar cells. In order to enhance photoconversion efficiency, tandem DSSCs has been approached where the two different cells having complementary absorption spectra are mechanically stacked. This thesis work is directed to avoid and alter the precious transparent conductive oxide (TCO) glass being commonly used in the conventional tandem device architectures aiming towards the fabrication of photon flux efficient novel tandem DSSCs architectures in combination with near infra-red (NIR) photon harvesting novel sensitizers. To begin with this compilation, focus has been centralized on the energy thrust promoted existing and current research status for solar cells in general and next generation solar cells in particular. The trend has followed the first ever demonstrated practical solar cell from bell lab to mature Si solar cell technology. The technology enhancement pave the way for thin film solar cell research.
Diverse application of solar cell for indoor and outdoor applications have necessitated the flexible solar cell research. Dye sensitized solar cells (DSSCs) possess these properties and have drawn attention due to its environmental friendly properties. Limitation to achieve high performance for DSSCs are outlined along with the discussion about the need for extending the photon harvesting window.
The photoconversion efficiency of DSSCs can be increased beyond the limit of a single cell by stacking multiple DSSCs with the complementary light absorption followed by photon harvesting. Conventional series connected and mechanically stacked tandem DSSCs bearing four TCO glass plates fabricated and its functioning was verified with external power conversion efficiency of 6.28% under simulated solar irradiation. Aiming towards reduction of fabrication cost, a novel tandem device architecture was proposed by stacking top cell TCO-DSSC and TCO-less back contact bottom cell DSSCs. This TCO-less bottom-cell DSSC was consisted of flexible and protected SUS metal mesh coated with dye adsorbed nanoporous TiO2 functioning as photoanode. The model sensitizing dyes D131 and N719 were utilized as photosensitizers for top cell and bottom cell respectively. The fabricated tandem device architecture have shown the practicality in terms of increased optical transmission (around 20%) at bottom cell by avoiding the intermediate TCO glass. To enable the flexible processing and more economical tandem device architecture, bottom cell counter electrode was also replaced with flexible titanium (Ti) foil leading to the enhanced photoconversion efficiency of 7.10 % which is not only better than individual cell but the conventional mechanically stacked four TCO base tandem DSSCs also.
After the demonstration of proof-of concept using model dyes for TCO-less tandem DSSCs
having capability of photon harvesting mainly in the visible region of solar spectrum, effort as directed to enhance the photon harvesting window by utilizing NIR light harvesting axially ligated Si-phthalocyanine dye in the TCO-less bottom cell. Efficient photoconversion was demonstrated having photon harvesting up to 900 nm. Conventional tandem DSSCs using four TCO glass was first fabricated using this NIR dye for the bottom cell in combination with N719 for the top cell with the efficiency of 6.58%. In order to provide the flexibility to the tandem DSSCs, ITO-PET film having similar resistivity and enhanced transparency compared to ITO glass was utilized for the top cell. This flexible film has been incorporated to mechanically stack this top cell DSSC with TCO-less back contact bottom DSSCs using Ti foil as counter electrode aiming towards the flexible TCO-less tandem DSSCs architecture. This resulting flexible tandem TCO-less DSSCs exhibited enhanced optical transmission (around 30%) and external power conversion efficiency of 7.19%
Convenient Devonding Strength Evaluatiom for Spray Coating Based on Intensity of Singular Stress
Full text linkProceedings of 5th International Conference on Fracture Fatigue and Wear, FFW 2016, 24-26 August 2016, Kitakyushu, JapanHearth rolls are used in continuous annealing furnace to produce thin steel sheet. The roll surface is usually coated by using thermal spraying, which has high adhesive strength and wears resistance. However, in the ceramics coating, thermal stress caused during heating and cooling process in the furnace may lead to debonding due to the low toughness of ceramics. In order to improve the heat resistance of the thermally sprayed coating, it is essential to evaluate the debonding strength. Generally, heat resistance of thermal spray coating is evaluated by thermal shock test prescribed by JIS H8304 and it has been discussed in terms of singular stress at the end of the interface for JIS specimen under thermal shock. However there is no research considering the real axial-symmetric geometry condition of the multilayer structure. Thus this paper will focus on the intensity of the singular stress at the end of interface for a 2D axial-symmetric model. Then, the most suitable conditions are discussed with varying the coating thickness and compared with our previous study
Application-specific Micro Rogowski Coil for Power Modules -Design Tool, Novel Coil Pattern and Demonstration-
Full text linkCIPS 2016 International Conference on Integrated Power Electronics Systems, Mar 8-10, 2016, Nuremberg, GermanyWe developed a printed circuit board “Rogowski coil” to improve the reliability of power modules and packages. For the design, we used a new tool for sensitivity and adopted a fishbone coil pattern to realize design sensitivity. The developed coil demonstrates flat sensitivity that is as good as that of commercialized current probes/sensors because the proposed coil pattern successfully cancels noise from an outside current with flat signal sensitivity by an inside current