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Goto H.,Kansai Paint Sales Co. | Moriya S.,Incorporated Administrative Agency Public Works Research Institute | Naitoh Y.,Shinto Paint Co. | Yamamoto M.,Dai Nippon Toryo Co. | And 2 more authors.
Zairyo to Kankyo/ Corrosion Engineering | Year: 2010

When weathering steels are applied to bridges located in the area with heavy contamination of salts or anti-freezing agents, some cases show generation of stratified loose rust layer on weathering steel in stead of intended protective rust layer formation. We studied repairing method of those weathering steels with undesired rust generation by painting. As a result, power tool cleaning is not effective enough to remove rusts with salts contamination.The remained salts in the rust affect performance of the repaired paint film and show unsatisfied anti-corrosive property. Source


Gomi T.,Tokyo University of Agriculture and Technology | Kobayashi S.,Incorporated Administrative Agency Public Works Research Institute | Negishi J.N.,Japan Aqua Restoration Research Center | Negishi J.N.,Hokkaido University | Imaizumi F.,University of Tsukuba
Landscape and Ecological Engineering | Year: 2010

We examined short-term responses of macroinvertebrate drift associated with experimental sediment flushing in a headwater. Increases in the drifting abundances of Ephemeroptera and Plecoptera coincided with increases in bed load yield rather than peaks in discharge or suspended sediment concentrations. The approach and arrival of a sediment wave may provide a physical cue that initiates the escape of benthic macroinvertebrates. Because fine bed load sediments, with diameters <4 mm, tended to accumulate on and in the substrate matrix, such sedimentation affected the benthic macroinvertebrates residing on and in the substrate, increasing the number of macroinvertebrates in the drift. Therefore, the decreases observed in the densities of most macroinvertebrate taxa following sediment flushing were probably associated with sediment deposition and the resulting escape of macroinvertebrates from benthic habitats. The magnitudes of the decreases in macroinvertebrate density were lower at sites located 200 m downstream from the sediment sources than at sites located 20 m downstream. The results from this experimental flushing study suggest that bed load movement and resulting sediment accumulation alter macroinvertebrate drift patterns and cause decreases in the abundances of benthic macroinvertebrates in headwater streams. © 2010 International Consortium of Landscape and Ecological Engineering and Springer. Source


Inoue K.,Incorporated Administrative Agency Public Works Research Institute | Wakabayashi F.,National Museum of Nature and Science | Domen K.,University of Tokyo
Chemistry Letters | Year: 2012

The behavior of formate adsorbed on Cu(110) surface exposed to hydrogen gas was investigated at 300-330 K. Although an exchange reaction from D-COO(a) to H-COO(a) was observed after exposing a DCOO(a)-covered Ni(110) surface to H 2 in a previous report, this did not occur with Cu(110). The preadsorbed DCOO(a) desorbed as DCOOH after accepting a hydrogen atom from a gaseous H 2 molecule. © 2012 The Chemical Society of Japan. Source


Inoue K.,Incorporated Administrative Agency Public Works Research Institute | Uchida T.,Incorporated Administrative Agency Public Works Research Institute
Chemical Engineering and Technology | Year: 2013

Microalgae were cultured using actual sewage effluent and the influences of various controls such as the hydraulic retention time to the culture were examined. The microalgae could be cultured by supplying only sewage effluent without additional external microalgal stock or nutrient salts. As the microalgae increased, the nutrient salts and metals were removed from the culture water. The cell number of green algae increased to 3.3 times by increasing the hydraulic retention time from 4d to 6d. With the addition of air into the culture water, the green algae accounted for 87% of the total population. These controls led to an increase in the useful green algae components as the fuel. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Inoue K.,Incorporated Administrative Agency Public Works Research Institute | Uchida T.,Incorporated Administrative Agency Public Works Research Institute
Chemosphere | Year: 2013

The microalgae could be multiplied by supplying only sewage influent or effluent without any additional microalgal stock or nutrient salt. In a semicontinuous culture, the N:P weight ratios consumed were 14:1 and 18:1 for the sewage influent and effluent, respectively. The total cell number and green algae ratio of microalgae cultivated by semicontinuous culture exceeded those of batch culture. No cyanobacterial cells were observed in the semicontinuous culture using the sewage effluent. The organic components in the cultured microalgae using sewage effluent, eluted by n-hexane, were determined. The ratio of unsaturated fatty acid exceeded that of saturated fatty acid, which was possibly attributable to the fluidity of the cell membrane. The squalene was also obtained by the culture using sewage alone, free of any external stock or nutrient salt. The higher heating value of the microalgae of semicontinuous culture using the sewage influent was 25MJkg-1, corresponding to the heating value of lignite and showing the potential of the sewage culture microalgae as a means of power generation and combustion aid. © 2013 Elsevier Ltd. Source

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