Topic
Magnetic dipole
About: Magnetic dipole is a research topic. Over the lifetime, 15730 publications have been published within this topic receiving 324730 citations.
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01 Sep 1984
TL;DR: In this article, the amplitudes of the quasi-static electromagnetic fields produced in, on, and above the surface of a sea of finite depth by vertically-directed harmonic electric and magnetic dipoles (VED's and VMD's, respectively) and horizontally-directed HEDs and HMDs, respectively, were studied.
Abstract: : Results are presented of a study of the amplitudes of the quasi- static electromagnetic fields produced in, on, and above the surface of a sea of finite depth by vertically-directed harmonic electric and magnetic dipoles (VED's and VMD's, respectively) and horizontally-directed harmonic electric and magnetic dipoles (HED's and HMD's, respectively). In a previous report and publication we presented numerical data for the fields produced on and above the surface of the sea by the dipole sources when submerged in the sea. We now present data for the fields produced in the sea by the same dipole sources when they are either on or elevated above the surface. The primary purpose of these computations is to determine the conditions under which an electrically- conducting sea bed can produce significant changes in the fields generated by the dipoles, as compared with the fields produced in, on, and above an infinitely deep sea, for frequencies in the ULF, ELF, and VLF bands (frequencies less than 30 kHz). The present work shows that the fields produced in the sea by elevated dipoles are comparatively little affected by the presence of the sea floor.
3 citations
Journal Article•
3 citations
TL;DR: In this article, the mutual impedance between electric and/or magnetic dipoles in a circular tunnel containing a leaky coaxial cable is derived for arbitrary dipole positions, and a broad minimum in transmission loss is found in the range from 2 to 10MHz.
Abstract: The mutual impedance between electric and/or magnetic dipoles in a circular tunnel containing a leaky coaxial cable is derived for arbitrary dipole positions. For the usual case of large dipole separation, the bifilar mode approximation is used to compute the mutual impedance and associated transmission loss. For typical cable parameters, a broad minimum in transmission loss is found in the range from 2 to 10MHz. In this frequency range, the transmission loss is slightly less for magnetic dipoles (loops) than for electric dipoles. While the analytical model is a cable within a tunnel, the general approach and many of the conclusions would apply to similar above-ground systems. Thus the results are relevant to railway and roadway communications of the limited access type.
3 citations
TL;DR: In this article, the microwave rotational spectrum of the most abundant species of 3-Cyanothiophene was investigated for the ground vibrational state, and the electric dipole moment components μa and μb and the 14N-quadrupole coupling constant X + = X bb + X cc were determined from the Stark effect splittings and hfs-splittings respectively.
Abstract: Abstract The microwave rotational spectrum of the most abundant species of 3-Cyanothiophene was investigated for the ground vibrational state. Rotational constants and centrifugal distortion constants are given. The electric dipole moment components μa and μb and the 14N-quadrupole coupling constant X + = X bb + X cc were determined from the Stark-effect splittings and hfs-splittings respectively. The experimental results are compared to CNDO/2 calculations and are discussed with reference to ring distortion.
3 citations
TL;DR: In this paper, the energy levels and lifetimes for the lowest 204 fine-structure levels belonging to the 2s22p, 2s2p2, 2p3, 2m3l, 2n2p3l and 2p24l configurations of B-like Pd XLII are calculated using the multiconfiguration Dirac-Hartree-Fock (MCDHF) method, as well as wavelengths, transition probabilities, weighted oscillator strengths, and line strengths for electric dipole (E1), electric quadrupole(E
Abstract: Energy levels and lifetimes for the lowest 204 fine-structure levels belonging to the 2s22p, 2s2p2, 2p3, 2s23l, 2s2p3l, 2p23l, 2s24l, 2s2p4l, and 2p24l (l = s, p, d, f) configurations of B-like Pd XLII are calculated using the multiconfiguration Dirac-Hartree-Fock (MCDHF) method, as well as wavelengths, transition probabilities, weighted oscillator strengths, and line strengths for electric dipole (E1), electric quadrupole (E2), magnetic dipole (M1), and magnetic quadrupole (M2) transitions among these levels. In the calculations, the contributions from Breit interaction and quantum electrodynamics (QED) corrections are taken into account. Comparisons are made with available theoretical energies and electric dipole oscillator strengths.
3 citations