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Studies on Transparent, Highly Porous Materials Based on Organopolysiloxanes / 有機ポリシロキサン系透明高気孔率材料に関する研究Shimizu, Taiyo 23 March 2017 (has links)
京都大学 / 0048 / 新制・課程博士 / 博士(理学) / 甲第20198号 / 理博第4283号 / 新制||理||1615(附属図書館) / 京都大学大学院理学研究科化学専攻 / (主査)准教授 中西 和樹, 教授 北川 宏, 教授 島川 祐一 / 学位規則第4条第1項該当 / Doctor of Science / Kyoto University / DGAM
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Synthesis and Characterization of Polyimide/Polyacrylonitrile BlendSurya, Ramakrishna January 2019 (has links)
No description available.
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Studies on 4D printing Thermo-responsive PNIPAM-based materialsShun, Li 30 April 2021 (has links)
No description available.
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Effects of Nb Additions and Accompanying Heat Treatments on Material and Mechanical Properties of Armor Steels Manufactured in Small ScaleDyar, Cody Nathanual 04 May 2018 (has links)
Modified rolled homogeneous armor (RHA) steels were designed and produced to characterize the effects of niobium additions and accompanying heat treatments on microstructure and mechanical properties. This study combines in-house steel production and property analysis to advance the understanding of niobium on enhanced hardenability and weldability in a chemistry-process-structure-property relationship paradigm. For steel production, designed alloys were cast in a vacuum induction melting furnace and thermo-mechanically processed. Optimal heat treatment conditions were determined by utilizing a thermo-mechanics calculation software. Microstructures were investigated by optical and electron microscopy while hardenability was characterized by Jominy end-quench tests. Mechanical tests were performed at various stress states, strain rates, and temperatures to understand deformation behavior under complex loading conditions. Encouraging results in performance were observed in the micro-alloyed armor steels as compared to reference materials from earlier studies.
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THE EFFECT OF MATERIAL AND PROCESSING ON THE IMPACT STRENGTH OF VAPOR-GROWN CARBON NANOFIBER/VINYL ESTER COMPOSITESTorres, Glenn William 09 December 2011 (has links)
A design of experiments methodology was used to investigate the effect of vaporgrown carbon nanofiber (VGCNF) weight fraction, high-shear mixing time, and ultrasonication time on the Izod impact strength of vinyl ester (VE) based nanocomposites. A response surface model (RSM) was developed for predicting impact strengths using a regression analysis approach. The RSM predicts a maximum increase in impact strength of 18% at a VGCNF weight fraction of 0.17 parts per hundred parts resin (phr) (a volume percent of ~0.1) and 100 min high-shear mixing when compared to that of neat VE. The impact strength predictions show an initial increase for low VGCNF weight fractions and extended high-shear mixing. However, a marked decrease in impact strength occurred as the VGCNF weight fraction increased above 0.45 phr. Scanning electron micrographs of the fracture surface of several specimens suggest that the impact strength of VGCNF/VE nanocomposites is directly related to nanofiber dispersion.
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Morphological and mechanical characteristics of injection molded blends of poly(ethylene terephthalate) and poly(amide - 6,6)Sahto, Mohammad Aslam. January 1983 (has links)
No description available.
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Effect of boron on microstructure and mechanical properties of low carbon microalloyed steelsLu, Yu, 1977- January 2007 (has links)
No description available.
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Rheological and thermal properties of sorghum doughKulamarva, Arun. January 2005 (has links)
No description available.
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Effect of microstructure on static and dynamic mechanical properties of high strength steelsQu, Jinbo, 1971- January 2007 (has links)
No description available.
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Microstructure Evolution and Mechanical Behaviors of Triphase Immiscible Nanocomposites Under Extreme EnvironmentsTongjun Niu (13030485) 12 July 2022 (has links)
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<p>Materials performance under extreme conditions is pivotal to the design of advanced nuclear reactor materials. Nanocrystalline metals possess improved radiation resistance and superior mechanical properties. However, it remains a major challenge to stabilize the fine grains in nanocrystalline materials at elevated temperatures. The response of abundant interfaces and triple junctions to thermal annealing, plastic straining and radiation damage profoundly influence the overall performance of nanocrystalline metals. The objective of this thesis is to illustrate a new alloy design strategy via engineering the interfaces and triple junctions of triphase nanocomposites to enhance the thermal stability, mechanical strength and radiation tolerance of nanocrystalline metallic materials simultaneously. </p>
<p>In triphase nanocomposites where each phase is nearly immiscible to the others, the triple junctions and phase boundaries form a 3D interlocking network that could significantly increase the thermal and radiation stability. In this thesis, two distinct triphase architectures were explored: nanolaminate and nanocrystalline Cu-Ag-Fe composites fabricated by magnetron sputtering. The effectiveness of Cu-Ag-Fe triphase triple junctions in mitigating thermal grooving was evaluated by considering grooving kinetics. Additionally, micropillar compression tests on Cu-Ag-Fe nanolaminate composites demonstrated substantial enhancement of strength and strain hardening capability comparing to Cu/Fe multilayers. The nanocrystalline Cu-Ag-Fe composites exhibited a distinct texture evolution and greatly enhanced resistance to grain coarsening. In situ sequential dual beam (He + Kr) irradiation studies show nanocrystalline Cu-Ag-Fe composites have a remarkable bubble swelling resistance, suggesting the strong He storage and defect annihilation capability of the triphase nanocomposites. The results obtained from this thesis provide innovative perspectives on the design of high strength nanostructured metals with enhanced thermal stability and radiation tolerance.</p>
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