Laser spectroscopy and chemometric study of the specific features of air exhaled by patients with lung cancer and chronic obstructive pulmonary disease

The specificity of exhaled air spectra in the range from 9.2 to 10.6 µm for patients with lung cancer and chronic obstructive pulmonary disease has been analyzed by laser spectroscopy and chemometrics methods. The informativeness of the absorption spectra of exhaled air is compared with that of clinical analysis data.     

Bose-Einstein correlations for pions produced inp p collisions at 360 GeV/c

Zeitschrift für Physik C Particles and Fields - Correlations among identically charged pions were measured for pions produced inp p collisions at 360 GeV/c using the EHS spectrometer. The...     

Distortion of the space-time characteristics of short optical pulses due to refraction in atmospheric absorption lines

Numerical methods were used to study distortion of the space-time characteristics of an optical pulse due to refraction over inclined paths in atmospheric absorption lines in the case where the width of the pulse spectrum is comparable to the width of the absorption line. The calculations involved use of a model of the winter and summer atmosphere in the middle latitudes and the absorption lines of water vapor in the visible and near infrared regions. Here, allowance was made for laws governing the change in the width, central frequency, and form of the contour of the absorption line with altitude. Estimates were made of the radical expansion of the beam of radiation and the change in the direction and time of propagation for a short optical pulse caused by refraction in atmospheric absorption line.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, No. 8, pp. 21–25, August, 1987.     

Two-Photon Excitation Fluorescence Microscopy of Rat Elastin Fiber In Vivo

Russian Physics Journal - The paper presents the results of two-photon excitation fluorescence microscopy of rat elastin fiber in vivo. It is shown that in approximating the fluorescence...     

Anisotropy of inhomogeneous resonant media during transient interaction with optical pulses

This study predicts the manifestation of anisotropic properties in linearly isotropic inhomogeneous resonant media during the propagation of optical pulses through them with pulse durations comparable to the phase memory of the medium. For examples, the energy of an obliquely incident pulse propagating through a layered inhomogeneous medium, varies with inversion of the propagation direction. This effect results from phase modulation of the pulse duse to variation in refraction in a region of transient coherent processes in the medium. This study analyzes the most favorable conditions for observing anisotropic effects.V. D. Kuznetsov Siberian Physical — Technical Institute, Tomsk State University. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 8, pp. 96–99, August, 1994.     

Soliton formation processes in optically dense media

Numerical methods are used to investigate the characteristics of soliton formation when optical pulses of arbitrary shape and duration propagate in resonantly absorbing media of large optical thickness. It is shown that a regime of soliton propagation in a resonant medium, characterized by a nonlinear Schrödinger equation model, changes to a self-induced transparency regime. Incoherent steady-state interaction conditions are then replaced by coherent interaction. This effect can be utilized to compress laser pulses.V. D. Kuznetsov Siberian Physicotechnical Institute at the State University, Tomsk. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 10, pp. 95–99, October, 1994.     

Two body correlations between negative pions in pp interactions at 69 GeV/c

Correlations between two π^? in pp interactions at 69 GeV/c are presented in terms of longitudinal and transversal variables. The dominant feature is the existence of a strong shortrange positive correlation between the two π^? in the central region.     

Estimate of lacunarity of vibrational-rotational absorption spectra of water vapor

Optical spectra of vibrational-rotational absorption bands of atmospheric water vapor are interpreted in terms of fractal analysis. The main calculation parameter is the lacunarity of the initial spectrum. The variation in the lacunarity makes it possible to estimate the degree of translational and scale invariance of the entire spectrum as some quasi-random frequency function.