Results 11 to 20 of about 1,225 (202)

Laboratory technology and cosmochemistry [PDF]

Proceedings of the National Academy of Sciences, 2011
Recent developments in analytical instrumentation have led to revolutionary discoveries in cosmochemistry. Instrumental advances have been made along two lines: ( i ) increase in spatial resolution and sensitivity of detection, allowing for the study of increasingly smaller samples, and (
Zinner, Ernst, Moynier, Frédéric, Stroud, Rhonda   +2 more
openaire   +4 more sources

Chemical Geodynamics of Granitoid Magmatism During a Pacific‐Philippine Sea Plate Transition in Southwest Japan

Geochemistry, Geophysics, Geosystems
Granitoid magmatism along the western Pacific margin records interactions between subduction dynamics and crust–mantle processes; however, the links between plate reorganization and magma‐source evolution remain debated.
Nghiem V. Dao, Tsegereda A. Yemer, Tulibako T. Mwaisuba, Chie Sakaguchi, Hiroshi Kitagawa, Katsura Kobayashi, Teruyoshi Imaoka, Eizo Nakamura   +7 more
doaj   +2 more sources

Spacecraft instrument technology and cosmochemistry [PDF]

Proceedings of the National Academy of Sciences, 2011
Measurements by instruments on spacecraft have significantly advanced cosmochemistry. Spacecraft missions impose serious limitations on instrument volume, mass, and power, so adaptation of laboratory instruments drives technology. We describe three examples of flight instruments that collected cosmochemical data.
Harry Y, McSween, Ralph L, McNutt, Thomas H, Prettyman   +2 more
openaire   +3 more sources

Over the possible role of metal atom clusters in cosmochemistry and in the origin of life [PDF]

Revista de Química, 1992
We present here the hypothesis of a possible relationship between metal atom clusters and the formation of organic molecules in the interstellar medium and on small bodies as a possible pathway to the origin of such molecules.
Silvio Dioses Castro, Richard Korswagen
doaj   +2 more sources

TOF-SIMS in Cosmochemistry

, 2004
Time-of-flight secondary ion mass spectrometry (TOF-SIMS) was introduced into cosmochemistry about a decade ago. Major advantages of TOF-SIMS compared to other ion microprobe techniques are (a) parallel detection of all secondary ions with one polarity in a single measurement – both polarities in subsequent analyses, (b) high lateral resolution, (c ...
Stephan, T. (Thomas)
core   +3 more sources

Magnetic Domain Texture in Fe₃O₄ Thin Films on SiO₂ Nanospheres. [PDF]

Adv Mater
Fe3O4 thin films grown on ordered SiO2 nanospheres form curved nanocaps with 3D geometry, inducing magnetic domain texture. X‐ray spectromicroscopy (XMCD‐PEEM), cross‐sectional electron microscopy (STEM), and polarized grazing‐incidence small‐angle neutron scattering (GISANS) reveal how topography modulates magnetization.
Hamed MH, Xu Y, Elnaggar H, Zaghloul M, Mio AM, Backs A, Stellhorn A, Lima VO, Yin C, Bednarski-Meinke C, Steinke NJ, Petracic O, Brückel T, Saerbeck T, Qdemat A.   +14 more
europepmc   +2 more sources

Cometary impacts into ocean: Thermodynamical equilibrium calculations of high-temperature O2 generation on the early Earth [PDF]

Journal of the Serbian Chemical Society, 2002
The early Earth’s atmosphere apparently differed from the present atmosphere mainly in its lack of free O2, and this absence is believed to have been indispensable for the origin of early anaerobic life forms. One of the central problems in Earth science
Premović Pavle I., Panov Katja I.
doaj   +1 more source

Organic Matter in the Asteroid Ryugu: What We Know So Far

Life, 2023
The Hayabusa2 mission was tasked with returning samples from the C-complex asteroid Ryugu (1999 JU3), in order to shed light on the formation, evolution and composition of such asteroids.
Christian Potiszil, Masahiro Yamanaka, Chie Sakaguchi, Tsutomu Ota, Hiroshi Kitagawa, Tak Kunihiro, Ryoji Tanaka, Katsura Kobayashi, Eizo Nakamura   +8 more
doaj   +1 more source

Air oxidation of the kerogen/asphaltene vanadyl porphyrins: An electron spin resonance study [PDF]

Journal of the Serbian Chemical Society, 2000
The thermal behavior of vanadyl porphyrins was studied by electron spin resonance during heating of kerogens, isolated from the La Luna (Venezuela) and Serpiano (Switzerland) bituminous rocks, at 250ºC for 1 to 20 days in the presence of air ...
Premović Pavle I., Tonsa Ivana R., Đorđević Dragan M., Pavlović Mirjana S.   +3 more
doaj   +1 more source

The cretaceous-tertiary boundary Fiskeler at Stevns Klint, Denmark: The geochemistry of the major trace metals [PDF]

Journal of the Serbian Chemical Society, 2001
Trace metals in the four discrete layers of the Cretaceous-Tertiary boundary (Fiskeler) at Stevns Klint (Denmark) are relatively well studied, yet much remains to be learned about them. Therefore, an integrated study of the trace (meteoritic Ir,
Premović Pavle I., Nikolić Nikola D., Pavlović Mirjana S., Todorović Bratislav Ž., Đorđević Dragan M., Nikolić Ružica S., Lopez Liliana, Lomonaco Salvador   +7 more
doaj   +1 more source