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Enhanced electrochemical precipitation of phosphorus in wastewater by the addition of drifting Corbicula shells
Get PDFPhosphorus (P) is a finite and essential resource, and its linear movement from mines to waste streams may result in shortages. This has encouraged efforts to recover P from sewage systems for reuse. This study developed a new electrochemical P precipitation system for the subnatant of the sludge flotation thickening process, in which drifting Corbicula shells are added to provide a supply of calcium ions (Ca2+) to promote P precipitation. However, adding Corbicula shells to coexisting suspended solids (SS) and coagulant resulted in adsorption of the shells in the neutralized and hydrophobized floc clusters, which limited their electrochemical dissolution. Adding Corbicula shells after SS removal by flotation with electrochemically generated gases resulted in their successful electrochemical dissolution, which enhanced phosphate-P removal. Increasing the amount of Corbicula shells enhanced the phosphate-P removal to a point, after which further addition simply increased Ca2+. The consumption of H+ generated near the anode for the dissolution of Corbicula shells increased the pH of the bulk solution, which enabled P precipitation not only onto the cathode but also in the bulk solution. Analysis of chemical composition in the generated particles suggests that they can be used as a slow P-release fertilizer and soil conditioner
Construction of Web-GIS for integrating geophysical survey data with geotechnical information in the San'in region, southwest Japan
Get PDFConstructing geotechnical information database to collect information such as geophysical survey results and borehole data and then sharing it among researchers and engineers will be useful for developing research on the subsurface structure and the prevention of disasters such as earthquakes and landslides. The geotechnical information includes analysis results based on geophysical surveys, seismic observations, and borehole data. This database can be visually displayed on a map using a Geographic Information System (GIS). The existing analysis results can be checked consecutively. This will allow us to consider new observation plans and to improve the efficiency and accuracy of the subsurface structure model analysis. Therefore, in this study, a database of geotechnical information was developed for the San’in, Japan region. The San’in, Japan region is the western part of Honshu on the Sea of Japan side and includes Tottori and Shimane prefectures. The database of geotechnical information includes the results of microtremor and gravity survey, estimation of the subsurface structure based on seismic records, and borehole data in Tottori and Shimane prefectures. We gather high dense survey points from multiple references in the San’in region, Japan, such that the average space intervals of single station microtremor, microtremor array, gravity survey, and borehole were around 0.1–1, 1–5, 1, and 0.1–1 km, respectively. Furthermore, the corresponding sites of each survey type were conducted over 6000, over 280, over 7500, and over 3700, respectively. In addition, we developed a system to display the database on a map in a web browser (Web-GIS). GIS, Leaflet, a JavaScript library, were used to display the database of geotechnical information using the Geospatial Information Authority of Japan (GSI) tiled map as the base map. The developed database on the GIS system will be a useful tool that can be used by researchers, engineers, and other stakeholders in the future
Microvoid Formation of Ferrite-martensite Dual-phase Steel via Tensile Deformation after Severe Plastic Shear-deformation
Get PDFOne of the objectives for the development of high-strength dual-phase (DP) steel is improving the stretch-flangeability. Large-strained sheared edges are deformed and frequently cracked during stretch-flange formation. Considering shearing as the first deformation, the stretch-flange deformation may be regarded as a secondary deformation. To improve the stretch-flangeability of the DP steels, many researchers have analyzed the microvoid formation. However, in these analyses, the shearing process was not considered. With this background, ex-situ mini-bending tests combined with scanning electron microscopy (SEM) monitoring of microvoid formation were conducted during the secondary deformation. Prior to the secondary deformation, several microvoids were observed on the sheared surface and fine subgrains formed in the ferrite. During secondary deformation, the preliminary microvoids present at the ferrite-martensite interface propagated into the ferrite phase. In contrast, this behavior was not observed for the reamed surface deformation, which was formed without preliminary deformation. Furthermore, microvoids were initiated on ferrite grains that were not present at the ferrite-martensite interface, and martensite islands were not cracked during secondary deformation. This result is noteworthy because martensite cracking was the main factor involved in microvoid initiation, in the absence of shearing. Electron backscattering diffraction analysis revealed that the work hardening of ferrite, prior to the secondary deformation, caused a deviation in the strain concentration sites from those found in the reamed surface deformation. Therefore, this study elucidated microvoid formation on preliminary deformed surfaces via shearing and provided insights for material development considering deformations on the sheared surfaces of materials
Human chromosome 3p21.3 carries TERT transcriptional regulators in pancreatic cancer
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Secreted matrix metalloproteinase-14 is a predictor for antifibrotic effect of IC-2-engineered mesenchymal stem cell sheets on liver fibrosis in mice
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Bacterial?fungal interactions between Paraburkholderia fungorum GIB024 isolated from a Rhizopogon roseolus sporocarp and ectomycorrhizal fungi: Mycelial growth-promoting activity and fungal strain specificity
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Finger-Touch Direction Feature Using a Frequency Distribution in the Writer Verification Base on Finger-Writing of a Simple Symbol
Get PDFIn this study, individuals were asked to draw a symbol by using their fingertips on a digital device screen. This study focused on finger-touch direction information that can be extracted from a smartphone screen. To suppress rapid changes in the detected direction data, preprocessing was introduced, and its effectiveness was confirmed by evaluating the verification performance. Finally, representing the direction data as a frequency distribution was introduced as a new feature, which was demonstrated to improve the verification performance
