Author: Yamashita, Norimichi ; Motomura, Kosaku ; Hatori, Tomonori ; Nakano, Michito ; Kato, Yuichi ; Ogawa, Kazuhiro ; Saito, Hiroki ; Ichikawa, Yuji

The effectiveness of a corrosion repair technique consisting of laser cleaning and cold spraying was investigated.The effect of laser pulse frequency on the removal of surface corrosion on steel specimens was analyzed.Subsequently, a zinc coating was cold-sprayed on specimens cleaned of surface corrosion using conventional disk grinder and laser methods.Furthermore, salt spray tests were conducted to compare the corrosion protection performance of the zinc coating on these specimens.The results showed that laser cleaning can effectively remove surface corrosion and that a laser pulse frequency of 15 kHz is more effective than that of 40 kHz for removing the surface oxide layer.A comparison of cold-sprayed zinc coatings on laser-cleaned and non-treated specimens indicated that surface oxidation during laser treatment may neg. affect zinc deposition efficiency.The zinc coating on the laser-cleaned specimen was more than twice as thick as that on the conventionally cleaned specimen, and the coating-specimen interface maintained good adhesion after a 168 h salt spray test.Although no corrosion was observed in both steel specimens after the salt spray test, cracking of the remaining corroded areas on the substrate and delamination of the coating occurred in the conventionally cleaned specimen.

Baiomateriaru

Biocompatible PEEK (polyether ether ketone) polymer

Author: Yamamura, Takatoshi

A review.CFRP (carbon fiber reinforced plastics) is becoming popular material for the aircraft.The advantages for the CFRP are not only the weight savings, but also fatigue and corrosion resistance.CFRP fuselage made it possible to have ground level pressure and higher humidification in the cabin during the flight, which would provide more comfortable journey to the passengers comparing with the conventional aluminum fuselage.In the medical industry, in the combination of biocompatible PEEK polymer with the new composite molding technol., materials for the implant devices are recently being replaced with CFRP.In addition to the advantages of CFRP mech. properties for the medical application, the stable cost of the CFRP may give more com. benefit to the health care market comparing with the price of titanium in future.

Electronics

An Evaluation of the Autonomic Nervous Activity and Psychomotor Vigilance Level for Smells in the Work Booth

Author: Yoshida, Yutaka ; Yuda, Emi ; Yamada, Atsushi ; Otani, Aoi

In this study, we investigated the effects of the smell environment in the work booth on autonomic nervous activity (ANS) and psychomotor vigilance levels (PVLs) using linalool (LNL) and trans-2-nonenal (T2N). The subjects were six healthy males (31 ± 6 years old) and six healthy females (24 ± 5 years old). They sat in the work booth filled with the smells of LNL and T2N for 10 min, and their electrocardiograms (ECGs), skin conductance levels, pulse wave variabilities, skin temperatures, and seat pressure distributions were measured. In addition, the orthostatic load test (OLT) and psychomotor vigilance test (PVT) were performed before and after entering the work booth, and a subjective evaluation of the smell was also performed after the experiment. This paper focused on ECG and PVT data and analyzed changes in heart rate variability indices and PVT scores. Males felt slightly comfortable with the LNL smell and showed promoted sympathetic nerve activity in the OLT after the smell presentation. Females felt slightly uncomfortable with the T2N smell and showed promoted sympathetic nerve activity and a decrease in PVT scores in the OLT after the smell presentation. Gender differences were observed in ANS and PVLs, and it is possible that the comfort of LNL increased sympathetic nervous activity in males, while the uncomfortableness of T2N may have reduced work performance in females.

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