A method for determining optical constants, dimensions, and concentrations of “soft” absorbing particles in the brightening band region

We investigate the possibilities of creating a method for estimating the optical constants, dimensions, and concentrations of “soft” absorbing particles by applying a theoretical analysis of the angular dependence of the intergrated indicatrix, overall characteristics of light scattering, and absorption on the phase shift and diffraction parameter of particles in the brightening band region. We show that using the investigated optical characteristics, it is possible to determine the unknown parameters of a suspension from experimental data. Institute of Biophysics, Siberian Branch of the Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russia. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 6, pp. 807–812, November–December, 1997.     

Integral light-scattering indicatrix of optically soft spherical particles

The dependences of the angular distribution of the scattered energy on the particle size and refractive index and on the phase shift (Δ) were studied. It was shown, in particular, that in the hypsometric plane for Δ≥3, the light-scattering indicatrix F calculated by the Mie theory is determined by two factors: the Fraunhofer diffraction and geometrical optics. The possibility of measuring the refractive index from the experimental values of the aperture angle of a photodetector at fixed values of F was also considered.     

Shear Band Formation in Fe–Cr–Mo–V–B–Si Amorphous Alloy under Nanoindentation

The formation of shear bands in Fe–Cr–Mo–V–B–Si amorphous alloy under nanoindentation Is studied. The indentation process is considered against the background of shear band formation in the amorphous material.     

Effect of Isochronous Annealing on the Formation of Shear Bands in the Vicinity of a Stress Concentrator on the Surface of Iron-Based Amorphous Alloys

The effect of isochronous annealing on the formation of shear bands in the vicinity of a stress concentrator on the surface of an amorphous material is studied. Using the local deformation method, a parameter is introduced to determine the temperature interval in which amorphous and crystal phases coexist.     

Spectra of discontinuous noise waves

The article considers the problem of the transformation of the energy spectrum of an intense random wave in a nonlinear, nondisperse medium. It is assumed that at the inlet to the nonlinear medium there is given a random quasimonochromatic wave, and an investigation is made of the spectrum of a nonlinear wave at distances where the original continuous wave goes over into a sequence of sawtooth pulses with a random position of the discontinuity and with random amplitudes. In the work, an investigation was made of the dependence of the spectral characteristics of discontinuous noise waves on the statistics of the amplitude and phase of the input quasimonochromatic wave. The form of the spectrum of the wave is found at low frequencies, which appear due to the effect of the autodetection of the quasimonochromatic wave in a nonlinear medium. The effect of the viscosity of the medium on the form of the energy spectrum is also discussed.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 21, No. 11, pp. 1627–1636, November, 1978.The authors are indebted to A. N. Malakhov and A. I. Saichev for their valuable evaluations.     

Structure and electrical properties of rapidly quenched foils of antimony—copper and antimony—zinc alloys

It has been determined that foils of antimony and Sb-Cu and Sb-Zn alloys obtained by rapid quenching of melts are characterized by a (1012) + (0001) texture. The nonequilibrium solubilities of copper and zinc in antimony reach 2–3 at. %. Zinc is a donor in antimony while copper acts as a neutral doping element.Translated from Izvestiaya Vysshikh Uchebnykh Zavedenii, Fizika, No. 9, pp. 72–75, September, 1991.     

Structure effects of the protonated lincomycin molecule on the mechanism of its complexation with organic compounds

The mechanism of complexation of the protonated lincomycin molecule with para-substituted nitrobenzenes in the gas phase is analyzed by quantum chemical methods. The regioselectivity of lincomycin protonation is treated in a B3LYP/6-31G(d′, p) approximation; the geometrical structure and conformation of the molecule are analyzed. The lincomycin molecule is protonated at the nitrogen atom of the pyrrolidine cycle. In stable conformers, a pseudovoid is formed and stabilized by intramolecular hydrogen bonding. The cross section of the pseudovoid (1.77–2.62 Å) is too small for the protonated lincomycin molecule to participate in host guest complexation with organic compounds. According to B3LYP/6-31G(d′, p) calculations, complexation of the protonated lincomycin molecule with nitrobenzenes occurs through hydrogen bonding.