Incorporated Administrative Agency Public Works Research Institute

Tsukuba, Japan

Incorporated Administrative Agency Public Works Research Institute

Tsukuba, Japan

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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.


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.


Patent
Incorporated Administrative Agency Public Works Research Institute and Pasco Corporation | Date: 2010-09-08

Measurement of 3D displacement based on successively captured images of an object becomes difficult to be performed due to a load imposed on an operator along with an increase of the number of target portions defined on the object and that of time steps for displacement measurement. A device for displacement measurement executes stereo measurement relative to a stereo image to generate 3D shape information and orthographically projected image of an object for each time, and tracks the 2D image of the target portion through pattern matching between orthographically projected images at successive times to obtain a 2D displacement vector. The device for displacement measurement converts the start point and the end point of the 2D displacement vector into 3D coordinates, using the 3D shape information, to obtain a 3D displacement vector.


Patent
PASCO Corporation and Incorporated Administrative Agency Public Works Research Institute | Date: 2012-07-18

Measurement of 3D displacement based on successively captured images of an object becomes difficult to be performed due to a load imposed on an operator along with an increase of the number of target portions defined on the object and that of time steps for displacement measurement. A device for displacement measurement executes stereo measurement relative to a stereo image to generate 3D shape information and orthographically projected image of an object for each time (S40), and tracks the 2D image of the target portion through pattern matching between orthographically projected images at successive times (S42) to obtain a 2D displacement vector (S44). The device for displacement measurement converts the start point and the end point of the 2D displacement vector into 3D coordinates, using the 3D shape information (S46), to obtain a 3D displacement vector (S48).


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.


Inoue K.,Incorporated Administrative Agency Public Works Research Institute | Uchida T.,Incorporated Administrative Agency Public Works Research Institute
Chemical Engineering and Technology | Year: 2016

Outdoor cultivation of microalgae was carried out in 20-L tanks using sewage influent or effluent, at an actual sewage treatment plant. The microalgae could be cultured by supplying only sewage influent or effluent without additional microalgal stock or nutrient salts. Adding air and CO2 to the culture water promoted not only the cultivation of green algae but also the consumption of nitrogen. Increasing the hydraulic retention time also promoted consumption and cultivation. In particular, adding CO2 to the sewage influent achieved a 59-fold increase in the cell number of specific Scenedesmus species useful as components for fuel. The microalgae culture progressed even in the autumn/winter. The major organic components eluted by n-hexane were fatty acids such as palmitic and 11-hexadecenoic acid. The applicability of sewage culture microalgae as biofuel was demonstrated. Copyright © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim


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.


Inoue K.,Incorporated Administrative Agency Public Works Research Institute | Uchida T.,Incorporated Administrative Agency Public Works Research Institute
Journal of Material Cycles and Waste Management | Year: 2016

Research and experimental studies were carried out in relation to reduction of hazardous elements contained in sewage sludge incineration ash. A questionnaire survey was conducted in 69 Japanese municipalities with sewage sludge incineration facilities. Selenium content in bag filter ash and ceramic filter ash was relatively higher than that in ash of cyclone and electrostatic precipitators. It was assumed that selenium vaporized in the furnace was due to adsorb in the fly ash on filter when passing through the low-temperature filter. To reduce high boiling point heavy metals in the ash, sewage sludge and incineration ash were heated up using a small muffle furnace. As the result, the chrome and nickel contents were reduced. A decrease in the surface area of ash and the reduction of elements occurred at the same time in sewage sludge and incineration ashes tested in this study. © 2016 Springer Japan


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.


PubMed | Incorporated Administrative Agency Public Works Research Institute
Type: Journal Article | Journal: 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 25 MJ kg(-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.

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