منابع مشابه
Quantitative mineralogical analysis of small samples of china clay using x ray diffractometry.
The quantitative mineralogical analysis of small samples (less than 20 mg) of china clay has been investigated using x ray diffractometry to determine kaolinite, mica, quartz, and feldspar. A method has been developed and applied to the quantitative analysis of airborne dust samples and of other small discrete samples. Determinations were made either on samples after collection on a membrane fi...
متن کاملHard X-ray Emission From Low Mass X-ray Binaries
We report on Rossi X-ray Timing Explorer observations of four type I X-ray bursters; namely 1E1724– 3045, GS1826–238, SLX1735–269 and KS1731-260. The first three were in a low state, with 1-200 keV Xray luminosities in the range ∼ 0.05−0.1 LEdd (LEdd: Eddington luminosity for a neutron star = 2.5×10 38 ergs s), whereas KS1731-260 was in a high state with a luminosity ∼ 0.35 LEdd. The low state ...
متن کاملSuperhumps in Low–Mass X–Ray Binaries
We propose a mechanism for the superhump modulations observed in optical photometry of at least two black hole X-ray transients (SXTs). As in extreme mass–ratio cataclysmic variables (CVs), superhumps are assumed to result from the presence of the 3:1 orbital resonance in the accretion disc. This causes the disc to become non–axisymmetric and precess. However the mechanism for superhump luminos...
متن کاملSpin-Up of Low Luminosity Low Mass X-ray Binaries
We examine the spin-up of low luminosity, low mass X-ray binaries (LMXBs) to millisecond pulsars (MSPs). In the conventional spin-up model of the Ghosh & Lamb type, where the stellar magnetic field interacts with the Keplerian accretion disk, MSPs could be produced from LMXBs if magnetic field B∗ <∼ 10 8(Ṁ/1016g/s)1/2G, where Ṁ is the mass accretion rate. However, for Ṁ < Ṁc ∼ 10 g/s accretion ...
متن کاملParallel Beam Powder Diffractometry Using a Laboratory X-Ray Source
We report on the application of a new, non-dispersive double multilayer optical arrangement to prepare a parallel beam from a laboratory x-ray source for standardization of powder diffraction reference materials and the associated high accuracy diffractometer. The beam preparation optic uses a graded-spacing parabolic multilayer to gather radiation from a small focus x-ray source and a subseque...
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ژورنال
عنوان ژورنال: Acta Crystallographica Section A Foundations of Crystallography
سال: 1987
ISSN: 0108-7673
DOI: 10.1107/s0108767387078140