We propose a self-consistent model taking into account variations in adsorption properties of the adsorbent surface in the process of adsorption-desorption of molecules of gas on it. We introduce a dimensionless coupling parameter that characterizes the interaction of an adsorbed molecule with polarized medium. It is established that the system can be bistable if the coupling parameter is greater than a critical value and the concentration of gas belongs to a certain interval. We show that the adsorption isotherms obtained within the framework of the proposed model essentially differ from the Langmuir isotherms and establish that the Zeldovich hysteresis is possible. The kinetics of the surface coverage is analyzed in detail. We show that taking account of variations in adsorption properties of the surface in the process of adsorption-desorption leads to new phenomena: a "quasistationary" state in the case of the overdamped approximation and damped self-oscillations of the system in the general case.

In Section 1 of the present paper we obtain the kinetic Enhanced fluctuations in semi-infinite plasmas.

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The general electromagnetic solution of the set of Maxwell-Boltzman equations is obtained for the case of semi-infiite multicomponent plasma at the assumption that (i) the random scattering of charged particles at the boundary takes place and (ii) the full particle flow is convserved in the process of scattering. The dielectric response function and the correlation functions for microcurrents have been found for such a plasma system and the relation between these functions has been written in the form of a generalization of the fluctuation-dissipation theorem. As the applications of these results to the investigation of physical phenomena the reflection of a plane wave from the plasmadielectric interface and the spectrum of excitations in a plasma with random scattering boundary were considered.

The test charge problem for a semi-infinite plasma is formulated. Expressions for the far field potential are derived for stationary and slowly moving test charges. By applying the superposition principle for uncorrelated dressed test particles we calculate the dynamic form factor as well as the energy spectrum of the spontaneous radiation field.

We investigate the competitive adsorption of a two-component gas on the surface of an adsorbent whose adsorption properties vary in adsorption due to the adsorbent deformation. The essential difference of adsorption isotherms for a deformable adsorbent both from the classical Langmuir adsorption isotherms of a two-component gas and from the adsorption isotherms of a one-component gas taking into account variations in adsorption properties of the adsorbent in adsorption is obtained. We establish bistability and tristability of the system caused by variations in adsorption properties of the adsorbent in competitive adsorption of gas particles on it. Conditions under which adsorption isotherms of a binary gas mixture have two stable asymptotes are derived. It is shown that the specific features of the behavior of the system under study can be described in terms of a potential of the known explicit form.

On the basis of transition probability approach the theory of thermal radiation is developed for the case of a plasma half space with a random scattering boundary. The influence of the boundary model on the spectral intensity of equilibrium radiation is investigated in detail for various frequency domains and different values of plasma parameters.

In biological olfactory systems, interaction of odorant molecules with olfactory receptor proteins is driven by Brownian motion. As a result, at chemical equilibrium, the total number of bound receptors changes randomly in time. Here we investigate the role of this effect, known in physics as adsorption-desorption noise, in the discriminating ability of olfactory receptor neurons. For this purpose we developed a computer program, which generates the adsorption-desorption process in a model neuron. We compared the processes resulting from two different odorants with different affinities for the receptor proteins. We took into account the threshold at which spikes are triggered and we calculated the neuronal selectivity due to the differences in the threshold-crossing statistics for the processes resulting from both odorants. We conclude that selectivity of the spiking response of the whole neuron is much greater than that of its receptor proteins in the near-threshold range of odorant concentrations.