Results 251 to 260 of about 164,663 (289)
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Journal of Chemical Physics, 2019
How to build a molecular Helmholtz coil? The possibility to create a Helmholtz coil at the molecular level is studied via the induced magnetic responses of several small cyclic hydrocarbon dimers with formula (CnHn)2 and Dnh symmetry (n = 6–10). Our results reveal that for n ≥ 8, π-electrons give rise to a uniform magnetic field within the central ...
Alvaro Muñoz-Castro +2 more
exaly +3 more sources
How to build a molecular Helmholtz coil? The possibility to create a Helmholtz coil at the molecular level is studied via the induced magnetic responses of several small cyclic hydrocarbon dimers with formula (CnHn)2 and Dnh symmetry (n = 6–10). Our results reveal that for n ≥ 8, π-electrons give rise to a uniform magnetic field within the central ...
Alvaro Muñoz-Castro +2 more
exaly +3 more sources
Optics Letters, 2003
A general dark-soliton solution of the Helmholtz equation (with defocusing Kerr nonlinearity) that has on- and off-axis, gray and black, paraxial and Helmholtz solitons as particular solutions, is reported. Modifications to soliton transverse velocity, width, phase period, and existence conditions are derived and explained in geometrical terms ...
P, Chamorro-Posada, G S, McDonald
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A general dark-soliton solution of the Helmholtz equation (with defocusing Kerr nonlinearity) that has on- and off-axis, gray and black, paraxial and Helmholtz solitons as particular solutions, is reported. Modifications to soliton transverse velocity, width, phase period, and existence conditions are derived and explained in geometrical terms ...
P, Chamorro-Posada, G S, McDonald
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L'année psychologique, 1894
Helmholtz. In: L'année psychologique. 1894 vol. 1. pp. 536-538.
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Helmholtz. In: L'année psychologique. 1894 vol. 1. pp. 536-538.
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Journal of the Optical Society of America A, 2005
A detailed study of the propagation of an arbitrary nondiffracting beam whose disturbance in the plane z = 0 is modulated by a Gaussian envelope is presented. We call such a field a Helmholtz-Gauss (HzG) beam. A simple closed-form expression for the paraxial propagation of the HzG beams is written as the product of three factors: a complex amplitude ...
Julio C, Gutiérrez-Vega +1 more
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A detailed study of the propagation of an arbitrary nondiffracting beam whose disturbance in the plane z = 0 is modulated by a Gaussian envelope is presented. We call such a field a Helmholtz-Gauss (HzG) beam. A simple closed-form expression for the paraxial propagation of the HzG beams is written as the product of three factors: a complex amplitude ...
Julio C, Gutiérrez-Vega +1 more
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Helmholtz and the Psychophysiology of Time
Science in Context, 2001ArgumentAfter having measured the velocity of the nervous impulse in the 1850s, Helmholtz began doing research on the temporal dimensions of visual perception. Experiments dealing with the velocity of propagation in nerves (as well as with aspects of perception) were carried out occasionally for some fifteen years until their final publication in 1871.
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Layer Stripping for the Helmholtz Equation
SIAM Journal on Applied Mathematics, 1996Summary: We develop a new layer stripping technique for the inverse scattering problem for the one-dimensional Helmholtz equation on the half line. The technique eliminates the use of ``trace formulas'', relying instead on a nonlinear Plancherel equality that provides a simple and precise characterization of the reflection data.
John Sylvester 0002 +2 more
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On Kelvin–Helmholtz instability
The Physics of Fluids, 1980It is shown that the wave energy for both modes in an inviscid Kelvin–Helmholtz model is positive in a reference frame moving with the density-weighted mean of the upper and lower flow speeds. This fact is significant in connection with the role of negative energy waves in hydrodynamic stability.
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Polarimetric Helmholtz Stereopsis
IEEE Transactions on Pattern Analysis and Machine IntelligenceHelmholtz stereopsis (HS) exploits the reciprocity principle of light propagation (i.e., the Helmholtz reciprocity) for 3D reconstruction of surfaces with arbitrary reflectance. In this paper, we present the polarimetric Helmholtz stereopsis (polar-HS), which extends the classical HS by considering the polarization state of light in the reciprocal ...
Yuqi Ding +5 more
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Polarimetric Helmholtz Stereopsis
2021 IEEE/CVF International Conference on Computer Vision (ICCV), 2021Yuqi Ding +4 more
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