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identifier:oai:t2r2.star.titech.ac.jp:00108331

Anodic stripping of TiAl surface was carried out in AlCl3-NaCl-KCl molten salt at 423 K as a pretreatment for the deposit formation of an Al-Cr alloy layer. The Al-Cr alloy deposit on the TiAl significantly improved the corrosion resistance against high temperature oxidation. In anodic stripping at 0.4 V vs. Al/Al3+, anodic dissolution of surface occurred non-uniformly. On the other hand, an oxide film on TiAl was completely removed by uniform anodic dissolution at 1.2 V with electricity of 1 C cm-2. An Al-Cr electroplating layer that was formed after the anodic stripping at 1.2 V, exhibited excellent oxidation resistance that was confirmed by an oxidation test at 1173 K for 24 h.

identifier:oai:t2r2.star.titech.ac.jp:00045837

金沢大学理工研究域電子情報学系

identifier:oai:t2r2.star.titech.ac.jp:00000993

Microcapsules containing tri-n-octylamine as an extractant with the diameter of less than 25μm were prepared by using SPG membrane emulsification and insitu polymerization method. The morphologies of microcapsules, the encapsulation efficiencies of tri-n-octylamine, the extraction properties of palladium （II） from hydrochloric acid solution and the back extraction properties of palladium （II） from microcapsules were investigated. The average diameter of obtained microcapsules was about half of the pore diameter of SPG membrane. The encapsulation efficiency of tri-n-octylamine was approximately 100% for all the microcapsules prepared in this study. Therefore, it can be said that there was practically no loss of tri-n-octylamine during the preparation of microcapsules. All microcapsules prepared in this study reached forward extraction equilibrium within 5 minutes and the forward extraction ratio reached nearly 1. The back extraction of palladium （II） from microcapsules was carried out using 0.1M-hydrochloric acid solution containing a prescribed amount of thiourea. The back extraction occurred promptly and the back extraction ratio was high enough to elute all palladium （II） out from the microcapsules. Furthermore, by repeating forward and back extraction experiments, the durability of microcapsules was examined. From the result, it can be said that tri-n-octylamine was encapsulated rigidly and there was no leakage during extraction and back extraction experiment. Thus it seemed that the microcapsules were capable to be used in a repeated operation.

identifier:oai:t2r2.star.titech.ac.jp:00106472

This paper applies Bayesian Optimization Algorithm with Tabu Search (Tabu-BOA) to electric equipments configuration problems in a power plant. Tabu-BOA is a hybrid evolutionary computation algorithm with competent GAs and meta-heuristics. The configuration problems we consider have complex combinatorial properties, therefore, they are hard to formulate and solve via conventional mathematical programming techniques. Using the proposed method, we have solved the following problems. The complexity of the problems are increasing in order: (1) Cost Minimization of electric equipment configuration and the corresponding cabling; (2) Plus the decision of the power plant operation patterns; (3) Plus parallel operation of plural transformers, (4) Plus the change of the supply voltages (high voltage or low voltage) to the electric power load, and (5) Add the other objective, that is, both minimization of the cost and maximization of the surplus power supply. identifier:oai:t2r2.star.titech.ac.jp:50244938

identifier:oai:t2r2.star.titech.ac.jp:00073445