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Variations In Upper Mantle Structure Under Northern Australia (1993)

Dey, S. C. ; Kennett, B. L. N. ; Bowman, J. R. ; [et al.]

Oxford, UK : Blackwell Publishing Ltd

Geophysical journal international 114 (1993), S. 0

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ISSN: 1365-246X

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Geosciences

Notes: Temporary array deployments of short-period seismometers in northern Australia have been used to build up composite record sections for waves interacting with the upper mantle. Stable measures of the seismic wavefield are provided by stacking the complex envelopes of all the seismic waveforms falling in a 10km distance interval away from the source.Two groups of sources (a) along the Flores Arc, Indonesia with propagation under northwestern Australia, and (b) in New Guinea with paths to the NNE of the array, have been used to construct composite record sections for both P and SV waves over the distance range 1300–2800 km. the timing and amplitude distributions for P waves from the two regions show noticeable differences. Detailed modelling of the record sections yields velocity models with significant variation in velocity for the two sets of propagation paths for which the midpoints are separated by about 1000km.The short-period SV-wave sections indicate efficient propagation of highfrequency S waves in a lithosphere extending down to 210km. Arrivals from the deeper mantle cannot be correlated with confidence because of a loss in high-frequency content revealed by broad-band observations. This requires a significant attenuation zone for S beneath 210 km.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1365-246X.1993.tb03919.x

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Embryonic Signals in Pregnancy (1986)

DEY, S. K.

Oxford, UK : Blackwell Publishing Ltd

Annals of the New York Academy of Sciences 476 (1986), S. 0

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ISSN: 1749-6632

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Natural Sciences in General

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1749-6632.1986.tb20922.x

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Synthesis of stoichiometric nickel aluminate spinel nanoparticles (2015)

Hasan, M., Drazin, J., Dey, S., Castro, R. H. R.

Mineralogical Society of America

In: American Mineralogist

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Publication Date: 2015-02-13

Description: Nickel aluminate is a transition metal oxide with spinel structure with potential applications as catalysts and sensors. Both applications benefit from high specific surface areas as well as chemical stoichiometry control. However, a systematic approach to understand synthetic parameters affecting stoichiometry and agglomeration of nickel aluminate nanoparticles is still lacking. In this work, co-precipitation using direct and reverse strikes and polymeric precursor techniques were comparatively studied to address this problem. While the polymeric method could deliver stoichiometric spinel, the samples were highly agglomerated exhibiting low surface area. Both co-precipitation procedures produced smaller sizes and less agglomerated nanoparticles as compared to the polymeric precursor, but for the reverse-strike, Ni 2+ preferentially formed a soluble complex with ammonia and led to nickel deficient nanoparticles. Stoichiometric (1 mol NiO:1 mol Al 2 O 3 ) nanocrystalline nickel aluminate was only achieved when using controlled excess Ni 2+ . The normal-strike lead to more stoichiometric compositions without need for excess cations, but the obtained nanoparticles were less homogeneous and showed smaller surface areas as compared to the reverse-strike method.

Print ISSN: 0003-004X

Electronic ISSN: 1945-3027

Topics: Geosciences