Results 211 to 220 of about 150,202 (254)
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Thermal conductivity of mixtures of argon‐helium, argon‐nitrogen, and argon‐neon
AIChE Journal, 1971AbstractA secondary concentric cylinders cell was used to measure the thermal conductivity of binary mixtures of argon‐nitrogen, argon‐helium, and argon‐neon approximately 20, 40, 60, and 80 vol. % at 75°C, and pressures to 2,800 atm. Measurements were made also on the pure gases argon and nitrogen.
Jon N. Peterson +2 more
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Potassium-Argon/Argon-Argon Dating Methods
1997During the latter half of this century anthropological surveys in East Africa have made significant contributions to understanding how the human species has evolved. In the past two decades, particularly, discoveries of our fossil ancestors have been made in unprecedented numbers and diversity.
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Wirkungsquerschnitt von Argon gegen Argon+
Zeitschrift f�r Physik, 1931Es wird eine Methode angegeben zur Messung des gegenseitigen Wirkungsquerschnitts von Gasionen und neutralen Gasmolekulen mit Besprechung apparativer und mestechnischer Einzelheiten. Die mit der Anordnung erhaltene Wirkungsquerschnittskurve fur Argongas gegenuber Argon+-Ionen verlauft bis etwa 520 Volt Geschwindigkeit nahezu horizontal und steigt bei ...
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Potassium-Argon and Argon-40/Argon-39 Dating
1994Potassium is an alkali metal of Group IA in which its companions are lithium, sodium, rubidium and caesium. It is highly reactive with a relative density of 0·86 and a melting point of 62·3° C, an atomic weight of 39·0983 and an atomic number of 19; it has 18 isotopes.
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Polarizability of an Argon Atom in Solid Argon
The Journal of Chemical Physics, 1967A calculation in the tight-binding approximation, of the static polarizability of an argon atom in solid argon is presented. A linear variational technique is used to estimate the polarizability. The results are given as a function of the lattice parameter.
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2018
Argon–argon dating is a radioisotopic method based on the natural, spontaneous radioactive decay of an isotope of potassium, 40K, at a known rate to produce an isotope of argon, 40Ar. This method is one of the most versatile, precise and accurate of all radioisotopic dating tools applied to volcanic materials.
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Argon–argon dating is a radioisotopic method based on the natural, spontaneous radioactive decay of an isotope of potassium, 40K, at a known rate to produce an isotope of argon, 40Ar. This method is one of the most versatile, precise and accurate of all radioisotopic dating tools applied to volcanic materials.
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XPS Study in BiFeO3 Surface Modified by Argon Etching
Materials, 2022Joao Paulo Sinnecker +2 more
exaly