Deformation Process of Sandbar and Interaction between Vegetation and Sandbar in Meandering Channel of Shibetsu River

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv

Impact of Permeable Structures on Salinity Intrusion in the Abashiri River

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv

Observation on Behavior of Flowing Diriftwoods around Bridge Pier

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv

Magnetic Properties of Bulk Amorphous La-Fe Alloys

We have prepared three bulk amorphous La_Fe_x alloys (x=69.4, 76.7 and 82.5 at.% Fe) by a high rate dc-triode sputtering. All of the samples are found to be amorphous by neturon diffraction measurements. The amorphous Fe alloys with nonmagnetic Y and Lu are reported to have spin-glass characteristics, while the La-Fe alloys are found to be ferromagnetic. In the latter alloys, the magnetizations are easily saturated in low applied fields, and their values suggest that the Fe moments are completely aligned. Furthermore it has been found that the saturation magnetic moment has a maximum value 1.7μB per Fe atom at around x=75, while the Curie temperature tends to decrease gradually with increasing Fe concentration. The temperature dependence of the magnetization for these alloys follows the spin-wave relation M(T)=M_0(1-BT^-CT^). Using the values of B and C obtained, we have estimated the mean range of the Fe-Fe exchange interaction (). The range of the exchange increases sharply from ～2A^2 to ～100A^2 with increasing Fe concentration and exceeds that of crystalline Fe

Indium-bearing paragenesis from the Nueva Esperanza and Restauradora veins, Capillitas mine, Argentina

The Nueva Esperanza and Restauradora are two of the twenty-three veins described at Capillitas mine, an epithermal precious-and base-metal vein deposit located in northern Argentina. Capillitas is genetically linked to other minera-lizations of the Farallón Negro Volcanic Complex, which hosts several deposits. These include two world-class (La Alumbrera and Agua Rica) and some smaller (e.g., Bajo El Durazno) porphyry deposits, and a few epithermal deposits (Farallón Negro, Alto de la Blenda, Cerro Atajo and Capillitas). The main hypogene minerals found at these two veins include pyrite, sphalerite, galena, chalcopyrite, tennantite-(Zn) and tennantite-(Fe). Accessory minerals comprise hübnerite, gold, silver, stannite, stannoidite and mawsonite, and also diverse indium-and tellurium-bearing minerals. Quartz is the main gangue mineral. Indium participates in the structure of sphalerite, tennantite-(Zn), ishiharaite and an indium-bearing mineral, still under study, the former being the most abundant of these phases. The chemical composition of sphalerite shows very low concentrations of Fe and a wide range in indium contents from below the detection limit (0.03 wt. %) to values close to 22 wt. %. Atomic proportions of In and Cu correlate positively at a ratio In: Cu = 1: 1 atoms per formula unit. Cadmium reaches up to 0.68 wt. %. Other analyzed elements (Ge, As, Se, Ag, Sn, Te, Au, Pb and Bi) are systematically below their respective detection limits. Indium-bearing tennantite-(Zn) (up to 0.24 wt. % In) is rare and restricted to the area where ishiharaite appears. Ishiharaite and the unclassified indium-bearing mineral are extremely scarce and host up to 10 and 30 wt. % In, respectively. The zoning in sphalerite and the variable indium content of the different bands could be ascribed to significant fluctuation in the composition of the fluids (possibly pulses). They are evidenced by the presence of a high f Te2 mineral, like calaverite, and a low f Te2 phase, such as silver, within the same stage, with local periodic increments on In and Cu that could also be associated with recurring reactivation of fractures.Fil: Marquez Zavalia, Maria Florencia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; ArgentinaFil: Vymazalová, Anna. Czech Geological Survey; República ChecaFil: Galliski, Miguel Angel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; ArgentinaFil: Watanabe, Yasushi. Mining Museum of Akita University; JapónFil: Murakami, Hiroyasu. No especifíca

Development of a Si/CdTe semiconductor Compton telescope

We are developing a Compton telescope based on high resolution Si and CdTe imaging devices in order to obtain a high sensitivity astrophysical observation in sub-MeV gamma-ray region. In this paper, recent results from the prototype Si/CdTe semiconductor Compton telescope are reported. The Compton telescope consists of a double-sided Si strip detector (DSSD) and CdTe pixel detectors, combined with low noise analog LSI, VA32TA. With this detector, we obtained Compton reconstructed images and spectra from line gamma-rays ranging from 81 keV up to 356 keV. The energy resolution is 3.8 keV and 7.9 keV at 122 keV and 356 keV, respectively, and the angular resolution is 9.9 degrees and 5.7 degrees at 122 keV and 356 keV, respectively.Comment: 12 pages, 14 figures, submitted to SPIE conference proceedings vol. 5501, "High-Energy Detectors in Astronomy", Glasgow UK, 6/21-6/24 200