Results 221 to 230 of about 2,942 (252)

Detection of organic compounds in freshly ejected ice grains from Enceladus's ocean. [PDF]

Nat Astron
Khawaja N, Postberg F, O'Sullivan TR, Napoleoni M, Kempf S, Klenner F, Sekine Y, Craddock M, Hillier J, Simolka J, Hortal Sánchez L, Srama R.   +11 more
europepmc   +1 more source

Reconstructing charcoal formation temperatures in archaeology and volcanology using an automated 532 nm Raman spectroscopy approach. [PDF]

Sci Rep
Dellefant F, Brückner O, Budka J, Trepmann CA, Joseph F, D'Ercole G, Schultz KM, Huber A, Ertel-Ingrisch W, Scheu B, Wallace PA, Fontijn K, Kaliwoda M.   +12 more
europepmc   +1 more source

Recycling Foundry Sands in Concrete: A Comparative Study on the Use of Green Sand and Chemically Bonded Sand as Partial Replacements for Natural Sand. [PDF]

Materials (Basel)
Di Maida P, Sciancalepore C, Radi E, Lanzoni L, Milanese D.   +4 more
europepmc   +1 more source

Physicochemical Controls on the Compositions of the Earth and Planets. [PDF]

Space Sci Rev
Sossi PA, Hin RC, Kleine T, Morbidelli A, Nimmo F.   +4 more
europepmc   +1 more source

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Nanosized carbon-rich grains in carbonaceous chondrite meteorites

Earth and Planetary Science Letters, 2004
Abstract Macromolecular carbonaceous material is common in primitive meteorites. Little information exists on its form and composition, and there are no published data on nanometer-scale chemical and structural variations. Transmission electron microscopy (TEM) studies of CM meteorites reveal abundant, previously unrecognized nanosized carbonaceous ...
Laurence Garvie
exaly   +2 more sources

On the nature and origin of isolated olivine grains in carbonaceous chondrites

Geochimica Et Cosmochimica Acta, 1977
Abstract Many carbonaceous chondrites contain discrete olivine fragments that have been considered to be primitive material, i.e. direct condensates from the solar nebula or pre-solar system material. Olivine occurring in chondrules and as isolated grains in C3(0) chondrites has been characterized chemically and petrographically.
Harry Mcsween
exaly   +2 more sources

On the relationship between isolated and chondrule olivine grains in the carbonaceous chondrite ALHA77307

Geochimica Et Cosmochimica Acta, 1992
The origin of isolated olivine grains in carbonaceous chondrites has been suggested to be either by direct condensation or by fragmentation of chondrules. In an attempt to resolve this debate, isolated olivine grains in the carbonaceous chondrite ALHA77307 have been studied in detail.
Rhian H Jones
exaly   +2 more sources

Infrared spectra of carbonaceous chondrites and the composition of intertellar grains

Astrophysics and Space Science, 1975
Infrared spectra (7–40 μ) of the carbonaceous chondrites, Cold Bokkeveld, Murray, and Orgueil are compared with phyllosilicate minerals and interstellar grain spectra. Similarities in the position and shape of the silicate feature near 9.8 μ suggest that similar silicate minerals are present in primitive meteorites and the interstellar dust.
A. Zaikowski, R. F. Knacke
exaly   +2 more sources

Presolar spinel grains from the Murray and Murchison carbonaceous chondrites

Geochimica Et Cosmochimica Acta, 2003
With a new type of ion microprobe, the NanoSIMS, we determined the oxygen isotopic compo- sitions of small (1m) oxide grains in chemical separates from two CM2 carbonaceous meteorites, Murray and Murchison. Among 628 grains from Murray separate CF (mean diameter 0.15 m) we discovered 15 presolar spinel and 3 presolar corundum grains, among 753 grains ...
Sachiko Amari, Robert M Walker, Roy S Lewis   +2 more
exaly   +2 more sources