منابع مشابه
Measured radiation patterns of the scale model dipole tool
The sound field of finite dipole acoustic transducers in a steel tool was investigated and their horizontal by measuring their vertical radiation patterns in water at two different frequencies. Measurements were also made with the tool in scale models representative of sonic logging conditions in the field. A Lucite borehole model was used to represent a soft formation and an Austin Chalk boreh...
متن کاملRadiation forces in the discrete-dipole approximation.
The theory of the discrete-dipole approximation (DDA) for light scattering is extended to allow for the calculation of radiation forces on each dipole in the DDA model. Starting with the theory of Draine and Weingartner [Astrophys. J. 470, 551 (1996)] we derive an expression for the radiation force on each dipole. These expressions are reformulated into discrete convolutions, allowing for an ef...
متن کاملAsymptotic Theory for Dipole Radiation
The basic theory for dipole radiation in the presence of a two-layer half-space is outlined with special reference to its use as a model for studying radio propagation through and over heavily vegetated terrain. The source dipole may be located above or below the top surface of the slab. The dipole orientation is either vertical or horizontal. The asymptotic derivations for the field expression...
متن کاملNon-Abelian Dipole Radiation and the Heavy Quark Expansion
Dipole radiation in QCD is derived to the second order in αs. A power-like evolution of the spin-singlet heavy quark operators is obtained to the same accuracy. In particular, O(α2 s) relation between a short-distance low-scale running heavy quark mass and the MS mass is given. We discuss the properties of the effective QCD coupling α s (E) which governs the dipole radiation. This coupling is a...
متن کاملElectric Dipole Radiation from Spinning Dust Grains
We discuss the rotational excitation of small interstellar grains and the resulting electric dipole radiation from spinning dust. Attention is given to excitation and damping of grain rotation by: collisions with neutrals; collisions with ions; “plasma drag”; emission of infrared radiation; emission of electric dipole radiation; photoelectric emission; and formation of H2 on the grain surface. ...
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ژورنال
عنوان ژورنال: Biophysical Journal
سال: 1970
ISSN: 0006-3495
DOI: 10.1016/s0006-3495(70)86359-7