Vol 52, No 1 (2017)

Processes of production of cc̅-states in proton–nucleus collisions are considered. The model is proposed taking into account energy losses of hard gluons in inelastic interactions of hadron states with nucleus nucleons. Results of performed calculations on the A-dependence of inclusive spectra of pA → J/ψX processes are presented together with FNAL E866 experimental data.

The problem of origination of regular convection in the layer of nanofluid with one free surface by the absorption of light waves with spatially periodic intensity distribution in the plane of the layer caused by the temperature dependence of the surface tension coefficient is studied. The profiles of velocity and temperature in the volume of medium are determined. It is shown that the response of the system on the influence of a light wave is maximal other conditions being equal, when the period of interference pattern is about twice as large as the layer thickness.

The excitation of standing TM waves by a subwavelength slit in the single-mode waveguide resonator with the metallic borders is considered. In this structure, the input energy through the slit strongly depends on the incident wavelength. Consequently, the Q-factor of the system computed by the finite element method reaches the values of 10⁴ in the near infrared region. The significant change of the scattered wave energy is achieved by the changing of dielectric constant value by 5 ×10⁻⁴ or the thickness of resonator by 0.5 nm. The sensitivity of system to the parameters of structure allows one to use the system in various applications such as devices of optical bistability, modulators, and optical sensors of vibration, displacement and temperature.

The results of investigations of mid-infrared photodetectors based on InAsSbP quantum dot (QD) grown on InAs(100) substrate by modified liquid phase epitaxy are presented. The atomic force microscope measurements have shown that the surface density of grown QDs is (4–8) × 10⁹ cm⁻². Also, the morphology and crystalline quality of grown QDs are investigated by a scanning tunneling microscope. Photodetectors based on n-InAs(100) substrate with InAsSbP QDs on its surface were fabricated in the form of a photoconductor cell. The photoresponse spectrum extended up to 4 μm was observed. The optical properties of fabricated structures were investigated under He–Ne laser irradiation with wavelength of 1.15 μm. It was found that the relative surface conductance increases by 16% at power density of 0.15 W/cm². Capacitance hysteresis with maximal remnant capacitance of 2.17 nF at 10³ Hz was observed as well.

The surface tension and density of distilled water, physiological solution and salt solutions of the DNA, irradiated by nonthermal coherent millimeter electromagnetic waves with the frequencies 64.5, 50.3, and 48.3 GHz are investigated. The measurements of test samples show that due to irradiation the surface tension does not change within the experimental error. The densities of physiological solution and the salt solutions of the DNA increase under irradiation at the frequencies 64.5 and 50.3 GHz, which coincide with the resonant frequencies of oscillations of molecular water structures.

The average, variance, correlation function and the spectral density of ligand–receptor complexes in the presence of the external Langevin noise are calculated and their characteristics are defined. The analysis of the experimental data using the formulas derived in this work enables one to obtain a new information on the process of forming of ligand–receptor complex, namely, the constants rates of formation and the decay of the ligand–receptor complex.

The intensity distribution between reflexes in six-wave symmetric case of diffraction of CuKα₁ radiation was experimentally investigated with the help of double-block monolithic crystal system. It was shown that the multiwave reflexes obtained for germanium single crystal were divided by intensity in three groups, and after the second block 20 multiwave reflexes (beams) out of the obtained number of 36 ones were ‘pure’, i. e., not accompanied with two-wave backgrounds. A technique of precision measurements in the field of multiwave diffraction is proposed.