1-20 OF 1958 RESULTS FOR

doublets

Results shown limited to content with bounding coordinates.
Sort by
Journal Article
Published: 01 August 2010
Quarterly Journal of Engineering Geology and Hydrogeology (2010) 43 (3): 259-268.
...J.A. Barker AbstractAbstractA simple model has been developed as a scoping tool for transport between an injection well and an abstraction well pumping at the same rate (i.e. a doublet) in a fractured porous rock. This model is aimed primarily at the planning and preliminary interpretation...
FIGURES | View All (6)
Journal Article
Published: 01 October 1999
Bulletin of the Seismological Society of America (1999) 89 (5): 1147-1155.
... models on which the seismic gap hypothesis is based. Power-law recurrence fits these earthquake observations much better. 14 1 1999 Copyright © 1999, by the Seismological Society of America References Astiz L. Kanamori H. (1984) . An earthquake doublet in Ometepec, Guerrero, Mexico...
Journal Article
Journal: Geophysics
Published: 01 January 1994
Geophysics (1994) 59 (1): 36-45.
...Hirokazu Moriya; Koji Nagano; Hiroaki Niitsuma AbstractWe have developed a precise relative source location technique using acoustic emission doublets (AE doublets) in the triaxial hodogram method to evaluate the direction and distance of subsurface extension cracks. An AE doublet is a pair...
Journal Article
Published: 01 August 1982
Bulletin of the Seismological Society of America (1982) 72 (4): 1277-1294.
.... Cross-correlations of these waveforms reveal that the earthquakes in each pair are located within about 110 m of each other.Each pair can be interpreted as an earthquake doublet, that is, two similarly sized events with adjacent rupture zones that are related in time. The occurrence of doublets...
Journal Article
Published: 01 August 2008
American Mineralogist (2008) 93 (8-9): 1404-1411.
... of an untreated sample was fitted to two Fe2+ doublets and two Fe3+ doublets. The Fe2+ doublets had similar isomer shifts (1.13 and 1.16 mm/s for the octahedral M1 and M2 sites), different quadrupole splitting values (QS = 2.28 and 2.66 mm/s, respectively), and an M1:M2 area ratio of nearly 1:3. For ferric iron...
FIGURES | View All (7)
Journal Article
Published: 01 April 1999
American Mineralogist (1999) 84 (4): 536-549.
... the number of possibilities. The spectra could then be fitted to three Fe (super 2+) doublets and one Fe (super 3+) doublet. The Fe (super 2+) doublets have nearly identical isomer shifts: delta = 1.14-1.19 mm/s for the octahedral M1 and M2 sites and 1.12-1.20 mm/s for the irregular, eightfold-coordinated X...
Journal Article
Published: 01 April 2010
American Mineralogist (2010) 95 (4): 463-471.
... hyperfine parameters are observed only after heating to 873 K, at which point the first Fe3+ component from the oxidation of Fe2+ appears. The relative contribution of Fe3+/∑Fe reaches a maximum of 0.54 at 1073 K and then decreases with increasing temperature. A new Fe3+ doublet is observed in the samples...
FIGURES | View All (10)
Journal Article
Published: 01 August 2012
Bulletin of the Seismological Society of America (2012) 102 (4): 1829-1849.
... and repeating earthquakes. We compile a waveform dataset for deep earthquakes with magnitude above 4.7 occurring in the Tonga–Fiji–Kermadec subduction zone recorded teleseismically between 1990 and 2009. We identify 8 similar clusters and 18 similar doublets with an average cross‐correlation coefficient greater...
FIGURES | View All (10)
Journal Article
Published: 01 April 2008
American Mineralogist (2008) 93 (4): 658-666.
...+ and for (Fe2+-Fe3+) interactions structural information is still essential. Fe3+ MS doublets were identified and assigned to iron in Y and Z sites on the basis of structural information. In a few spectra, Fe3+ doublets with very low parameters (δ ~ 0.2 mm/s) were observed and, in contrast with the T-site...
FIGURES | View All (7)
Journal Article
Journal: Clay Minerals
Published: 01 March 2008
Clay Minerals (2008) 43 (1): 3-33.
...) quadrupole-splitting distributions (QSD); and (4) a technique that does not assume a particular line shape (subsequently referred to as ‘model-independent’). Values of δI, 𝛉M and f were determined using the method of De Grave & Van Alboom (1991).Results show that multiple doublets are routinely required...
FIGURES | View All (13)
Journal Article
Published: 01 March 2004
European Journal of Mineralogy (2004) 16 (2): 309-321.
.... In Mossbauer spectra of oxidized tourmalines the Fe2+ doublets with QS > 2 mm/s decreased, while the doublets with QS < 2 mm/s slightly increased during oxidation at elevated temperatures. Simultaneously, the Fe2.5+ mixed valence doublet and the Fe3+ doublets progressively increased with advancing...
FIGURES | View All (4)
Journal Article
Published: 01 November 2006
European Journal of Mineralogy (2006) 18 (6): 753-764.
...), the octahedral cations migrate from cis-into trans-sites with the formation of five-fold coordination of the former cis-and trans-octahedra. Therefore, the two main fitted doublets with quadrupole splittings, Δ, of 0.906 and 1.392 mm/s are supposed to be related to Fe3+ in the former cis- and trans-octahedra...
FIGURES | View All (5)
Journal Article
Published: 01 August 2001
The Canadian Mineralogist (2001) 39 (4): 1121-1130.
... (Mϕ6) octahedra, and the remaining two vertices are connected to octahedra through hydrogen bonds. There is a system of hydrogen bonds in the crystal structure of gladiusite (D–A < 3.50 Å), some of them bifurcated. The Mössbauer spectrum of gladiusite shows three doublets, two of which may...
FIGURES | View All (7)
Journal Article
Published: 01 August 1998
American Mineralogist (1998) 83 (7-8): 848-864.
... (super 3+) /Sigma Fe from 0.0-1.0. Fe (super 2+) is represented in the spectra by three doublets, with occupancy in at least three distinct types of Y sites (with different types of nearest and next nearest neighbors). Fe (super 3+) was found in 26 of the 54 samples studied. Although Mossbauer data do...
Journal Article
Published: 01 October 2017
American Mineralogist (2017) 102 (10): 2106-2112.
... spectroscopy. The basaltic glass represents an analog of a multi-component magma typical for the Earth. The Mössbauer spectra could be fitted by a two pseudo-Voigt doublet model including a high quadrupole splitting (QS) doublet and a low QS doublet, which were assigned to high-spin Fe2+ and high-spin Fe3...
FIGURES | View All (6)
Journal Article
Published: 01 July 2016
American Mineralogist (2016) 101 (7): 1659-1667.
... translucent brown to opaque and black. The total spin moment of the glass derived from X-ray emission spectroscopy decreases by ~20%. The complementary Mössbauer spectroscopy approaches reveal consistent changes in sites corresponding to 80–90% Fe2+ and 10–20% Fe3+. The high-spin Fe2+ doublet exhibits...
FIGURES | View All (7)
Journal Article
Published: 24 June 2016
Journal of Micropalaeontology (2016) 35 (2): 190-194.
... elements. However, closer examination of the basal rings and double skeletons (doublets) shows other differences that have received little attention. The location of the struts and pikes on each side of the Neogene Stephanocha basal ring are consistently rotated towards the basal corners. This establishes...
FIGURES
Journal Article
Published: 01 March 2016
European Journal of Mineralogy (2016) 28 (1): 93-103.
... are observed at M(1) and M(3) (i.e., ~13–15 and 11–12%, respectively). The 57Fe Mössbauer spectrum of hureaulite confirms the absence of ferric iron in the sample. The spectrum shows four well-separated absorption lines which are best fitted with three doublets. The well-resolved doublet (with the largest...
FIGURES
Journal Article
Journal: Geophysics
Published: 02 September 2015
Geophysics (2015) 80 (6): WC99-WC106.
... and interpretation for quality-control purposes to assess internal consistency among events from the same multiplet group. Crosscorrelation (CC) values decayed with interevent distance, and we found that doublets with large separation distances revealed location errors due to mispicks. Using histograms...
FIGURES | View All (10)
Journal Article
Published: 01 August 2015
American Mineralogist (2015) 100 (8-9): 1967-1977.
...+ and Fe2+ Mössbauer doublets and the second based on the temperature dependence of the center shift (CS) of the doublets. The ratio of the recoilless fractions for Fe3+ and Fe2+, CT, can then be used to adjust the observed area of the Mössbauer doublets into the Fe3+/∑Fe ratio in the sample. We also...
FIGURES | View All (6)