Depositing films from a supersonic jet of tetrafluoroethylene activated by interaction with a hot wire obstacle

The deposition of fluoroplastic (Teflon) films on a substrate by the method of hot wire chemical vapor deposition has been experimentally studied. It is established that the structure of obtained coatings strongly depends on nonequilibrium processes in a supersonic jet of a gaseous precursor. The dependence of the film morphology on the wire temperature is demonstrated.     

Performance calculation for inertial-type gas cleaners

Working formulas are given for the diameters of suspended particles trapped with 0.5 efficiency for dry centrifugal dust traps, wet dust traps (cyclones with wet film, scrubbers), and high-speed mist traps.     

The influence of the absolute phase of a short light pulse on the third harmonic generation in an optically thin nonlinear layer

The third harmonic generation dynamics and the response spectrum of an optically thin layer of a medium possessing cubic nonlinearity depend on the absolute phase of a short light pulse with a small (～2%) detuning of the carrier frequency from that of the linear oscillator in the medium. The results of computer simulation show that a relatively small change in the absolute phase can result in a two-fold increase in the amplitude of the response pulse generated at the triple frequency.     

Increasing the efficiency of an air separation plant by varying the cycle stage durations

A mathematical model of a plant for oxygen-enriched air production by pressure swing adsorption is proposed. The model takes into account the experimentally determined actual dependence of the longitudinal dispersion coefficient on the gas velocity and the sorbent particle size. The relationship between the plant efficiency and the duration of each of the operating cycle stages is studied using an ad hoc computer program for numerically solving the model equations. It is shown that optimization of the durations of cycle stages increases the thermodynamic efficiency of the plant to 20–22% in comparison to industrial plants.     

Turbo expert: A knowledge representation and processing language

Turbo Expert, a knowledge representation and processing language, is the basic support language for expert system construction. Turbo Expert has been implemented for IBM PC and for El'brus multiprocessor systems.Translated from Kibernetika i Sistemnyi Analiz, No. 5, pp. 149–157, September–October, 1991.     

The role of a surface flow in experiments with atomic hydrogen adsorbed on liquid helium

No Heading We apply a quantum hydrodynamics of the surface of ³He-⁴He solutions to account for the in-plane transport of the two-dimensional (2D) spin-aligned atomic hydrogen (H) adsorbed on superfluid helium film. We discuss how the surface flow of 2D H may be traced in experiment thus allowing to study the interaction of the 2D hydrogen with ripplons and surface-bound ³He as well as to observe the superfluidity of the 2D Bose gas of H. As an example we consider the formation of the ESR spectrum of the 2D H and find that in spatially non-uniform case the surface flow contributes significantly to the conditions of the ESR spectrum instability observable at high microwave power. We also analyze the conditions at which the surface flow of the 2D hydrogen plays an important role in thermal compression experiments.PACS numbers: 05.70.Np, 67.40.Pm, 67.65.+z, 68.03.Kn, 68.43.Mn     

Exact calculation of the multiloop stability margin

A mapping theorem by L.A. Zadeh and C.A. Desoer (1963) serves as the basis for an algorithm that computes the stability margin k _m of diagonally perturbed multivariable feedback systems without conservatism. The stability margin determination not only verifies system stability but also quantifies how much further the plan uncertainties can be extended before instability occurs. The essence of the computational approach is the realization that the true image of a given domain can be approximated with arbitrary accuracy by first subdividing the domain into the requisite number of subdomains and then forming the union of the convex hulls of their images. The technique is illustrated in an example with a plant model having three uncertainties. In general, the method is applicable to either SISO or MIMO LTI systems whose uncertainties can be modeled with noninteracting coefficients in the open-loop transfer function representations