R e g u l a r p a p e r s

Moscow University Physics Bulletin 1978. **33**. N 6. P. 1

We obtain the dynamical (wave and soliton) solutions of the equations of a nonlinear electrodynamics, the nonlinearity of which is caused by the contortion of space-time.

Show AbstractMoscow University Physics Bulletin 1978. **33**. N 6. P. 6

We obtain an expression for the electron Debye radius and derive formulas for calculating the ion current onto a probe for an arbitrary isotropic electron distribution function. An algorithm is given for extracting the second derivative of the electron current when measuring the electron distribution function by the method of Dreyvesteyn.

Show AbstractMoscow University Physics Bulletin 1978. **33**. N 6. P. 12

The change in the modulation depth of the interferogram of a three-layer interferometer as a function of the relative displacement of the transmission maxima of the component layers is analyzed experimentally. The fringes are displaced by rotating the interferometer with slightly wedge-shaped layers. The interferogram was recorded photoelectrically by scanning the fringes of equal inclination. The experimental relationship between the contrast of the modulation fringes and the relative displacement leads to the establishment of an analytical equation for the apparatus function of the interferometer.

Show AbstractMoscow University Physics Bulletin 1978. **33**. N 6. P. 18

Inelastic scattering of electrons in metals (e, e') is studied. It is shown that the dynamic form-factor, taking into account the transition of an electron from an atomic level to the Fermi surface, can be expressed in terms of the twoparticle Green function (in the channel the electron of the conduction band is an inner hole), in which case the expression for the dynamic form-factor holds over the whole frequency range of the spectrum (not only at the absorption edge).

Show AbstractMoscow University Physics Bulletin 1978. **33**. N 6. P. 24

We measure the temperature dependence of the magnetostriction, the magnetostrictive contribution to the thermal expansion, and that of the magnetization of monocrystalline terbium and the alloy Tb_0,5Gd_0,5. We find that the experimental data agree with the predictions of the one-ion theory as regards the temperature dependence of the magnetostrictive contribution to the thermal expansion. We calculate from experimental data and thermodynamic relations the dependence of the transition temperature and the magnetic-crystalline interaction on the lattice parameters. We demonstrate the agreement of these relationships with estimates made according to the theory of the crystalline field using the one-ion model.

Show AbstractMoscow University Physics Bulletin 1978. **33**. N 6. P. 30

Within the framework of perturbation theory it is shown that the integral condition of causality is satisfied for a regularized scattering matrix.

Show AbstractMoscow University Physics Bulletin 1978. **33**. N 6. P. 36

The conditions for maximum energy absorption, and equations for the selectivity of a multilayer interference absorber with a working layer of arbitrary thickness are obtained. It is shown that to synthesize a multilayer interference absorber with a specified selectivity (absorption band) one must choose the multilayer dielectric mirrors which surround the working layer with the required dispersion of the phase of the reflection coefficient, or vary the thickness of the working layer.

Show AbstractMoscow University Physics Bulletin 1978. **33**. N 6. P. 42

A method of calculating high-resolution NMR spectra in the region of strong spin-spin coupling is described. It is shown that in the general case one can determine the number of spectral lines and the Intensities of these lines. The forms of the spectra for which the calculation is carried out in analytical form are indicated. АаВb and ABC spectra are considered as examples.

Show AbstractMoscow University Physics Bulletin 1978. **33**. N 6. P. 48

It is shown that the correct variational problem in metric theory of gravitations, based on independent variation with respect to the coefficient of affine connectivity, is equivalent to the problem of finding the conditional extremum of the functional of the action S= ∫_Ω√(-g)Rd^4x.

Show AbstractMoscow University Physics Bulletin 1978. **33**. N 6. P. 51

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B r i e f r e p o r t s

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