Results 81 to 90 of about 28,933 (187)

Extreme 54Cr-rich nano-oxides in the CI chondrite Orgueil -Implication for a late supernova injection into the Solar System

, 2011
Systematic variations in 54Cr/52Cr ratios between meteorite classes (Qin et al., 2010a; Trinquier et al., 2007) point to large scale spatial and/or temporal isotopic heterogeneity in the solar protoplanetary disk.
Alexander, Amelin, Birck, Birck, Bizzarro, Bland, Bose, Boss, Boss, Boss, Busemann, C.M.O’D. Alexander, Cameron, Clayton, Clayton, Cody, Cody, Dauphas, Duprat, F.J. Stadermann, Fedkin, Floss, Floss, Gounelle, Gyngard, Hartmann, Hoppe, Huss, Huss, Hwang, Iwamoto, J. Wang, Johansen, Johansen, L. Qin, L.R. Nittler, Lugmair, Marhas, Markowski, McKeegan, Messenger, Messenger, Meyer, Mishra, Mostefaoui, Moynier, Nagashima, Nguyen, Nguyen, Nguyen, Nichols, Nittler, Ouellette, Ouellette, Papanastassiou, Park, Podosek, Qin, Qin, Qin, R.W. Carlson, Regelous, Rotaru, Shima, Shukolyukov, Travaglio, Trinquier, Trinquier, Trinquier, Vanhala, Vanhala, Vollmer, Vollmer, Woosley, Woosley, Yada, Zinner   +76 more
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Formulation procedures, rationale, and preliminary IMP-H flight data for silicone paints with improved stability [PDF]

Results are given of a class of silicone paints undergoing space qualification on IMP-H. In addition to ultraviolet irradiation, samples are presently reclining about 10 to the 16th power solar wind protons per year.
Schutt, J. B., Shai, C. M.
core   +1 more source

Electrically conductive thermal control coatings [PDF]

, 1978
A coating characterized by low thermal absorption, high thermal emittance and high electrical conductivity comprises: (1) a fired oxide pigment comprising a minor amount of aluminum oxide and a major amount of zinc oxide; (2) sufficient water to provide ...
Shai, M. C.
core   +1 more source

Condensation sequence of circumstellar cluster seeds (CSCCS)

Frontiers in Astronomy and Space Sciences
IntroductionTraditionally, the condensation sequence of circumstellar dust is predicted based on the thermodynamic stabilities of specific condensates in the macroscopic bulk phase.
David Gobrecht
doaj   +1 more source

Glass Ionomer Cements Based in TiO2 by Sol-gel Method

Orbital: The Electronic Journal of Chemistry, 2019
Glass ionomer cements are used in dentistry for applications such as luting cements and as restoratives materials, due to their ability to chemically bond to the tooth.
Thiago Ilipronti, Carolina Kleinibing Clare, Graciele Berndt, Elvio Antônio de Campos, Maria Helena Vaz Fernandes, Silvia Denofre de Campos   +5 more
doaj  

The chemistry of Saudi Arabian sand: A deposition problem on helicopter turbine airfoils [PDF]

Recent operations in the Persian Gulf have exposed military helicopter turbines to excessive amounts of ingested sand. Fine particles, less than 10 microns, are able to bypass the particle separators and enter the cooling and combustion systems.
Smialek, James L.
core   +1 more source

Late Pebble Accretion of Comet 81P/Wild 2 Nucleus: Evidence from a Plagioclase-bearing Chondrule Fragment, Pyxie

The Astrophysical Journal
Comet 81P/Wild 2 is a ∼4.5 km-sized primordial object that almost has not been modified by internal heating by ^26 Al decay. Its nucleus could have been formed by hierarchical agglomeration or gravitational collapse of pebble swarms concentrated by ...
Mingming Zhang, Michael E. Zolensky, Kohei Fukuda, Daisuke Nakashima, Michael K. Weisberg, Noriko T. Kita   +5 more
doaj   +1 more source

Lime and calcium-magnesium silicate in the ionic speciation of an Oxisol

Scientia Agricola
Plant residues and certain fertilizers accelerate soil acidification and increase the levels of aluminum-Al+3 in soils under no-tillage (NT). Silicates act as acidity amendments and as a source of silicon as in H4SiO4.
João Arthur Antonangelo, Jayme Ferrari Neto, Carlos Alexandre Costa Crusciol, Luís Reynaldo Ferracciú Alleoni   +3 more
doaj   +1 more source

Production and use of metals and oxygen for lunar propulsion [PDF]

Production, power, and propulsion technologies for using oxygen and metals derived from lunar resources are discussed. The production process is described, and several of the more developed processes are discussed.
Colvin, James E., Groth, Mary F., Hepp, Aloysius F., Landis, Geoffrey A., Linne, Diane L.   +4 more
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Formulation of electrically conductive thermal-control coatings [PDF]

The development and formulation of electrically conductive thermal control coating was undertaken for use on the International Sun Earth Explorer spacecraft. The primary effort was to develop a coating with a bulk resistivity of less than 100,000 ohm/sqm,
Shai, M. C.
core   +1 more source