منابع مشابه
Densities and Porosities of Ordinary Chondrites; Do High Porosity Meteorites Represent Regolith Materials?
Introduction: Densities and porosities of meteorites provide information about the physical properties of their parent bodies (asteroids). Recent studies report the densities and porosities of ~40 ordinary chondrite (OC) meteorites [1,2]. In this study, we present 42 additional measurements of OC densities and porosities, and provide a rigorous analysis of the errors in the method. Additionally...
متن کاملPorosities and Dimensions of Measures
University of Geneva, Departments of Physics and Mathematics, 1211 Geneva 4, Switzerland University of Jyväskylä, Department of Mathematics, P.O. Box 35, FIN-40351 Jyväskylä, Finland [email protected], [email protected], and [email protected] Abstract. We introduce a concept of porosity for measures and study relations between dimensions and porosities for two classes of measure...
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Synthetic colloidal spheres play a central role in applications as diverse as catalysis, medical diagnostics, and photonics. Even as many applications advance toward single-sphere implementations, methods for characterizing colloidal spheres typically offer only sampleaveraged overviews of such properties as spheres’ sizes and porosities. Moreover, such characterization methods as mercury adsor...
متن کاملThe velocity of meteoroids: a historical review
Determining the velocity of meteoroids as they enter the Earth’s atmosphere is very important since the value is fundamental in calculating the orbit of the meteoroid and hence eventually its origin. We describe early attempts at this determination and highlight problems that exist today.
متن کاملConstraining the Porosities of Interstellar Dust Grains
We present theoretical calculations of the X-ray scattering properties of porous grain aggregates with olivine monomers. The small and large angle scattering properties of these aggregates are governed by the global structure and substructure of the grain, respectively. We construct two diagnostics, RX and TX, based on the optical and X-ray properties of the aggregates, and apply them to a Chan...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2008
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:200810460