Forced Quasilinear Resonant Vibrations of a Frictional Mechanical System with Delay

Within the framework of the first asymptotic approximation, a dynamic analysis is made of a frictional mechanical self-oscillating system with three degrees of freedom excited by a weak periodic force near the resonance.     

Derivation of a quasiclassical scattering-phase approximation from the phase equations

A new radial phase equation is obtained for particles in a spherically symmetric potential field; the equation allows the quasiclassical asymptotes of the scattering phases _l() to be investigated.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 8, pp. 64–69, August, 1978.     

On the temperature and pressure dependence of the dynamic viscosity of n-alkanes

Isotherms of the coefficient of dynamic viscosity and isobars of n-alkanes are considered. One-parameter correlations for the isobars are constructed based on the literature data. A linear correlation is revealed between the boiling and melting temperatures and the found parameter of the baric dependence of viscosity for a homological series of alkanes.     

Semiconductor Research Needs in the Nanoscale Physical Sciences: A Semiconductor Research Corporation Working Paper

The purpose of this paper is to identify areas in the basic physical sciences where additional research is needed to sustain the extraordinary progress in electronics that has now extended for several decades. Also, it is argued that basic research will provide the foundation for the discovery of new generations of nanoelectronic devices that will continue the experimental rate of reduction in cost per function. Some of the fundamental areas requiring further research are the chemistry and physics of material interfaces, conductivity at small dimensions, deterministic doping effects, and nanomagnetics. Discovery research also is needed in the functional synergy of nanoelectronic materials and non-traditional fabrication methods.     

The thomson friction self-oscillations of a two-mass system with delay

A technique is proposed to study and design a mechanical self-oscillating system in the quasiharmonic-oscillation regime. The technique is based on the polynomial approximation of the force due to dry sliding friction by a finite number of terms in the Taylor-series expansion with allowance for energy dissipation in accordance with Pisarenko's hypothesis and the first “improved” asymptotic approximation. Transport University, Kiev, Ukraine. Translated from Prikladnaya Mekhanika, Vol. 36, No. 7, pp. 137–144, July, 2000.     

Lower concentration limit of carbon filtration combustion

For mixtures of carbon materials and an inert filler, dependences of the characteristics of the filtration combustion wave on the gaseous oxidizer supply rate at a fuel content in the mixture of less than 7 wt % were obtained. The existence of a lower concentration limit for a steady-state filtration combustion wave was established. It was demonstrated that at a given intensity of heat loss, the concentration limits are determined by the reactivity of the carbon material and the oxidizer supply rate. At the effective coefficient of heat loss α = 8 W/(m² K), effective conductivity of mixture material λ = 2 W/(m K), and air supply rate G = 0.1 m/s, the lowest fraction of carbon in the mixture at which combustion is still possible was 4.5 wt % for carbon-carbon composite, 2.5 wt % for activated birch coal, and 2.0 wt % for birch coal, the most reactive kind of carbon.     

Carbon Nanostructures

An overview of the various carbon structures with characteristic sizes in the nanoscale region is presented, with special attention devoted to the structures and properties of ‘nanodiamond’ and carbon nanotubes. The term ‘nanodiamond’ is used broadly for a variety of diamond-based materials at the nanoscale ranging from single diamond clusters to bulk nanocrystalline films. Only selected properties of carbon nanotubes are discussed, with an aim to summarize the most recent discoveries. Current and potential applications of carbon nanostructures are critically analyzed.     

Calculation of the dynamical deformation of thin shells induced by internal electrohydrodynamic pulse loads

Institute of Mechanics, Academy of Sciences of the Ukrainian SSR, Kiev. Electrohydraulics Planning and Design Office, Academy of Sciences of the Ukrainian SSR, Nikolaev. Translated from Prikladnaya Mekhanika, Vol. 26, No. 12, pp. 53–59, December, 1990.     

Three-dimensional quasiclassical van Horn wave functions

A rigorous mathematical basis is given for the general equation for the three-dimensional quasiclassical wave functions recently proposed by Van Horn.