Intra‐clinothem variability in sedimentary texture and process regime recorded down slope profiles

Shelf‐margin clinothem successions can archive process interactions at the shelf to slope transition, and their architecture provides constraints on the interplay of factors that control basin‐margin evolution. However, detailed textural analysis and facies distributions from shelf to slope transitions remain poorly documented. This study uses quantitative grain‐size and sorting data from coeval shelf and slope deposits of a single clinothem that crops out along a 5 km long, dip‐parallel transect of the Eocene Sobrarbe Deltaic Complex (Ainsa Basin, south‐central Pyrenees, Spain). Systematic sampling of sandstone beds tied to measured sections has captured vertical and basinward changes in sedimentary texture and facies distributions at an intra‐clinothem scale. Two types of hyperpycnal flow‐related slope deposits, both rich in mica and terrestrial organic matter, are differentiated according to grain size, sorting and bed geometry: (i) sustained hyperpycnal flow deposits, which are physically linked to coarse channelized sediments in the shelf setting and which deposit sand down the complete slope profile; (ii) episodic hyperpycnal flow deposits, which are disconnected from, and incise into, shelf sands and which are associated with sediment bypass of the proximal slope and coarse‐grained sand deposition on the medial and distal slope. Both types of hyperpycnites are interbedded with relatively homogenous, organic‐free and mica‐free, well‐sorted, very fine‐grained sandstones, which are interpreted to be remobilized from wave‐dominated shelf environments; these wave‐dominated deposits are found only on the proximal and medial slope. Coarse‐grained sediment bypass into the deeper‐water slope settings is therefore dominated by episodic hyperpycnal flows, whilst sustained hyperpycnal flows and turbidity currents remobilizing wave‐dominated shelf deposits are responsible for the full range of grain sizes in the proximal and medial slope, thus facilitating clinoform progradation. This novel dataset highlights previously undocumented intra‐clinothem variability related to updip changes in the shelf process‐regime, which is therefore a key factor controlling downdip architecture and resulting sedimentary texture

I know people who can and who cannot: A measure of the perception of economic inequality in everyday life

Versión preprintThis paper describes the development of the Perceived Economic Inequality in Everyday Life (PEIEL) scale. It is written and validated in Spanish. We first carried out an exploratory study, using a sample of 205 participants (52.2% men and 47.8% women; age: M = 24.69, SD = 8.95). We then conducted a confirmatory study with a sample size of 215 individuals (43.7% men and 56.3% women; age: M = 23.83, SD = 6.46). Results showed that the PEIEL scale is a valid and reliable unidimensional instrument. This scale negatively predicted tolerance of economic inequality over and above perceived inequality measured by wage gap estimates. In addition, perceived economic inequality in everyday life was negatively associated with tolerance of inequality, particularly in individuals with right-wing political ideology.Universidad de Costa Rica/[OAICE-006-2017]/UCR/Costa RicaUCR::Sedes Regionales::Sede de Occident

Address By The President Of The Organizing Committee

[No abstract available]39657557

On Indoor Radon Contamination Monitoring With Ssntds: Experimental Results Concerning Plate-out And Self-plate-out Effects

Measurements of the alpha activities of 222Rn and its daughters were performed, both inside a glass recipient and in closed rooms, employing SSNTDs (CR-39 and nuclear emulsion). The experimental results presented here show that plate-out and self-plate-out effects should be taken into account when SSNTDs are employed in indoor radon contamination monitoring. © 1989.2802-3506509Jacobi, (1972) Health Phys., 22, p. 441Cliff, Wrixon, Green, Miles, (1983) Health Phys., 45, p. 323Paschoa, Wrenn, Torrey, (1984) Radiat. Protect. Dosim., 7, p. 139Cohen, (1980) Health Phys., 39, p. 937Kerr, (1988) Science, 240, p. 606Altshuler, Nelson, Kuschner, (1964) Health Phys., 10, p. 1137McPherson, (1980) Health Phys., 39, p. 929Wrenn, Rosen, VanPelt, (1969) Health Phys., 16, p. 647Bigazzi, Hadler, Paulo, Proc. 14th Int. Conf. on SSNTDs Lahore Pakistan (1988) Nucl. Tracks and Radiat. Measurements., , 3rd Ed., to be published inBigazzi, Hadler, Paulo, (1986) Nucl. Tracks and Radiat. Measurements, 12, p. 71

Determination Of The Cr-39 Detection Efficiency For Infinite Film Geometry Source

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)CR-39 is a polymer that registers the passage of energetic ions, which break chemical bonds from its molecular structure. Chemical etching of the damaged region produces channels, referred to as tracks, which can be visualized by optical microscopy. Surface track densities are related to the volumetric activity concentration of the source. Aiming at determining the efficiency factors relating these two quantities, U3O8 films, with thicknesses ranging from 4.1 to 20.7mg/cm2 were manufactured and coupled with CR-39 sheets for 10 minutes each. After etching, track densities were determined by counting under an optical microscope. By fitting these data with a geometrical model, it was possible to find values for parameters related to etching and counting efficiencies: θc=(77±3)°; η=0.71±0.05. A value of the 4.5 MeV alpha particle range was found: R=(8.7±1.3)mg/cm2. This estimated range is shorter than the one predicted by simulation with SRIM2008, indicating that tracks from alpha particles with energies below 0.7 MeV are not revealed or counted after etching. © 2011 American Institute of Physics.1351148151Brazilian Physical Society (SBF),Sao Paulo Research Foundation (FAPESP),Coordenacao Aperfeicoamento Pessoal Ensino Super. (CAPES),Rio de Janeiro Research Foundation (FAPERJ),National Research Council (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Paulo, S.R., (2005) Radiat. Meas., 39, pp. 657-660Iunes, P.J., (2004) J. Radioanal. Nucl. Chem., 262, pp. 461-468Mikado, S., (2009) Nucl. Instrum. Meth. A, 605, pp. 171-174Guedes, S., (2002) J. Radioanal. Nucl. Chem., 253, pp. 73-76Ziegler, J.F., (2008) SRIM - The Stopping and Range of Ions in MatterPratt, J.W., Edgenworth, F.Y., Fisher, R.A., (1976) The Annals of Statistics, 4, pp. 501-51

On Indoor Radon Contamination Monitoring With Plastic Nuclear Track Detectors: The Influence Of Plate-out Effect

It was performed measurement of the radon-222 and daughters alpha-activity inside a glass recipient employing SSNTDs. The results of these measurements indicate no negligible influence of radon daughters plate-out on the surfaces both of materials surrounding the detectors and of the detectors themselves. In this work some aspects of the influence of the plate-out effect (in absence of ventilation) were studied. © 1989.151-4539542Jacobi, (1972) Health Physics, 22, pp. 441-450Cliff, Wrixon, Green, Miles, (1983) Health Physics, 45 (2 nº), pp. 323-330Bigazzi, Hadler, Marques, Paulo, (1986) Nuclear Tracks, 12 (1-6 n.), pp. 713-71

On Energy Absorption Effects In Uranium And Thorium Thin Films

The use of U and Th thin films, attached to detectors of fission tracks, allows determining the neutron fluence in nuclear reactors. In principle, the parameters involved in neutron fluence determinations through U and Th thin films that might be influenced by effects related with fission fragments and α particle energy absorption are: (i) the detection efficiency of nuclear emulsions for α particles, (ii) the detection efficiency of muscovite mica for fission fragments from thin films, ε{lunate}F and (iii) the detection efficiency of nuclear emulsions for fission fragments, used to estimate ε{lunate}F. Fission fragments are more ionizing than α particles and are more influenced by energy absorption. We show that fission fragment energy absorption effects are negligible in case of U and Th thin films employed in neutron fluence determinations for fission-track (FT) dating. © 2008.43SUPPL.1S334S336Bigazzi, G., Hadler, J.C., Iunes, P.J., Osorio, A.M., Muscovite SSNTD: detection efficiency for fission fragments (1991) Nucl. Tracks Radiat. Meas., 19, pp. 451-452Bigazzi, G., Guedes, S., Hadler, J.C., Iunes, P.J., Oddone, M., Osorio, A.M., Paulo, S.R., Zúniga, A., Potentialities and practical limitations of an absolute neutron dosimetry using thin films of uranium and thorium applied to the fission track method (1999) Radiat. Meas., 31, pp. 651-656Hadler, J.C., 1979. Estudos sobre Traços Anômalos Observados em Emulsões Carregadas com Urânio. Master Thesis, Universidade Estadual de Campinas, Campinas SP, BrazilHadler, J.C., Iunes, P.J., Mello, T.C.W.P., Navia, L.M.S., Paulo, S.R., On the nuclear emulsion detection efficiency for alpha particles and fission fragments (1996) Radiat. Meas., 26, pp. 169-171Iunes, P.J., Hadler, J.C., Bigazzi, G., Tello, C.A., Guedes, S., Paulo, S.R., Durango apatite fission-track dating using length-based age corrections and neutron fluence measurements by thorium thin films and natural U-doped glasses calibrated through natural uranium thin films (2002) Chem. Geol., 187, pp. 201-211Iunes, P.J., Hadler, J.C., Bigazzi, G., Guedes, S., Zúñiga, A., Paulo, S.R., Tello, C.A., Uranium and thorium film calibrations by particle track techniques (2004) J. Radioanal. Nucl. Chem., 262, pp. 461-468Iunes, P.J., Bigazzi, G., Hadler, J.C., Laurenzi, M.A., Balestrieri, M.L., Norelli, P., Osório, A.M., Curvo, E.A.C., U and Th thin film neutron dosimetry for fission-track dating: application to the age standard Moldavite (2005) Radiat. Meas., 39, pp. 665-668Osório, A.M., Iunes, P.J., Bigazzi, G., Hadler, J.C., Laurenzi, M.A., Norelli, P., Tello, C.A., Paulo, S.R., Fission-track dating of macusanite glasses with plateau and size correction methods (2003) Radiat. Meas., 36, pp. 407-412Segrè, E., Wiegand, C., Stopping power of various substances for fission fragments (1946) Phys. Rev., 70, pp. 808-81

Measurement Of The Relative Efficiencies Between Plastic Nuclear Track Detectors (lr-115 And Cr-39) And K0 Ilford Nuclear Emulsion For The Detection Of Radonium And Daughters Alpha Radioactivity In Air

Samples of Ilford K0 nuclear emulsions, type II LR-115 and CR-39 were exposed to the radioactivity originated from the radonium emanation from a Ra-226 source, in a closed ambient. It was used a cilindrical geometry made in such a way that the track detectors stayed in the same conditions of exposition with respect to the alpha radioactivity from the ambient air. The track detectors were developed at usual chemical conditions and then were analyzed at the optical microscope. In that conditions, it was observed that the ratio of efficiencies of CR-39 and of LR-115 to the K0 nuclear emulsion were 0.683±0.011 and 0.312±0.006, respectively. © 1986.121-6713716Moraes, (1982) MS. Thesis, , IPEN/Inst. de Física da USP, SP, BrazilPedraza, Edmonds, Durrani, (1984) Nucl. Tracks Rad. Measurements, 8, pp. 403-406Segovia, Cejudo, (1984) Nucl. Tracks Rad. Measurements, 8, pp. 407-41