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1

Symmetry of polychromatic beams and transverse energy flows

Mokhun Ihor I., Galushko Yurii K., Felde Christina V., Karabchiyvskiy Maksym D., Viktorovskaya Yuliia, Val Oleksandr D.

Opto-Electronics Review

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2024

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Vol. 32, No. 2

art. no. e150187

EN

The article considers the mechanisms of the formation of transverse energy flows in polychromatic fields with different structures. It is shown that the magnitude of the Poynting vector transverse component and the angular momentum for symmetric polychromatic beams are the same as in coherent monochromatic fields. Changes in the characteristics of energy flows due to the transformation and destruction of beam symmetry are demonstrated. The data of computer simulation are presented.

2

Dynamics of a mass variable drum winding a heavy rope

Buśkiewicz J.

Archives of Mechanics

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2021

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Vol. 73, nr 5-6

557--582

EN

The paper focuses on a winch drum winding a heavy rope to present the variety of issues related to the dynamics of systems with rotating parts of time-varying mass. The dynamic motion equations for such systems are frequently either incorrect or derived under the assumption of mass constancy. When the mass variability is taken into account, simpler cases are discussed. The considerations on the angular momentum theorem enables formulating a new two time parameters form of the rotational motion equation for the system with time varying mass. Four cases are considered and different approaches of motion equations derivation are applied. The assumptions and solution methods of the analyzed systems as well as ambiguities and possible contradictions that may arise as a result of the trial of the problem formulation on the grounds of rigid body mechanics are discussed. The numerical simulations are presented.

3

Surface effects of coupled fields in micropolar continuous media

Hoffmann T. J., Chudzicka-Adamczak M., Pytliński R., Pośpiech M.

Vibrations in Physical Systems

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2008

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Vol. 23

151--156

EN

In mechanics of continuous media, one of the sub areas is the coupled field theory describing interactions of mechanical, thermal, diffusion and electromagnetic field. All this physical fields are represented in the tensors introduced in this theory. Taking into consideration the momentum and angular momentum of the electromagnetic field in medium requires introduction of the fields: couple stress, mass angular momentum and mass couple in balance equations. From the vectorial nature of momentum, angular momentum, force and couple it appears that the stress tensor and couple stress tensor are the second order. Bearing in mind the importance for modern technology of the physical properties of the surface and surface layer of a solid, the conception of balance equations will be applied to describe the material surface interacting with an electromagnetic field.

4

The behavior of the Poynting vector in the area of elementary polarization singularities.

Mokhun I., Khrobatin R., Mokhun A., Viktorovskaya J.

Optica Applicata

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2007

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Vol. 37, nr 3

261-277

EN

The behavior of the Poynting vector in the area of elementary polarization singularities withone or two C-points, which are bounded by regular shape s-contour is considered. It has been shown that C-points are associated with the "vortex" kind singularities of the averaged transversal component of the Poynting vector if the handedness factor and topological charge of C-point are characterized by different signs. "Passive" Poynting singularities arise in the area if the signs are the same. It has been shown that the positions of the Poynting singularities shift relatively to the C-points under the phase and amplitude asymmetry of orthogonal components of the resulting field. The results of the computer simulation are presented.