Foam-Glass Modified By Technological Nano-additive

Investigations have been conducted to study the effects of man-made nano-additive on basic physical and mechanical properties of foamed glass. As the main raw material used tare and flat glass. It was investigate the effect of nano-additive on structural features of the resulting foam glass at a temperature of 850 °C

Foam-Glass Modified By Technological Nano-additive

Investigations have been conducted to study the effects of man-made nano-additive on basic physical and mechanical properties of foamed glass. As the main raw material used tare and flat glass. It was investigate the effect of nano-additive on structural features of the resulting foam glass at a temperature of 850 °C

Enhacement in the dymanic response of a viscoelastic fluid flowing through a longitudinally vibrating tube

We analyzed effects of elasticity on the dynamics of fluids in porous media by studying a flow of a Maxwell fluid in a tube, which oscillates longitudinally and is subject to oscillatory pressure gradient. The present study investigates novelties brought about into the classic Biot's theory of propagation of elastic waves in a fluid-saturated porous solid by inclusion of non-Newtonian effects that are important, for example, for hydrocarbons. Using the time Fourier transform and transforming the problem into the frequency domain, we calculated: (A) the dynamic permeability and (B) the function $F(\kappa)$ that measures the deviation from Poiseuille flow friction as a function of frequency parameter $\kappa$. This provides a more complete theory of flow of Maxwell fluid through the longitudinally oscillating cylindrical tube with the oscillating pressure gradient, which has important practical applications. This study has clearly shown transition from dissipative to elastic regime in which sharp enhancements (resonances) of the flow are found

Measurements of light background at large depth in the ocean

The mean intensity of Cerenkov emission from the products of K(40) decay and bioluminescence was measured at depths to 5 km. The intensity of ocean light background is found to depend upon depth and at the 5 km level is equal on averaged to 300 + or - 60 quanta/sq cms into spatial angle of 2 pi sterradian in transparency window. The amplitudes, duration and number of BL flashes were measured at various depths. The intensive flashes due to BL are shown to be observed rather seldom at depths over 4 km

Structure and stresses in a system of two mechanical twins in titanium

In the work we have presented the results of experimental studies and mathematical modeling for the processes of the structure formation in a transition zone of wedge-type twins system in commercially pure titanium. The process of interaction of structure defects with twinning dislocations during the formation of a wedge-type twin was taken into consideration. It is shown that the interaction alters the stress maximum in vicinity of boundaries in the system two wedge-type twi

Nanostructured coatings based on amorphous carbon and gold nanoparticles obtained by the pulsed vacuum-arc method

Nanostructured coatings based on diamond-like carbon and gold-doped carbon with a thickness of 100-300 nm were obtained by a pulsed vacuum-arc method on silicon substrates. The structure of the coatingswas studied by high-resolution transmission electron microscopy, the elemental composition was studied by X-ray microanalysi

Electrical conductivity and dielectric relaxation processes of the ceramic system Y2O3-ZrO2-SrTiO3-BiScO3

The ceramic system Y2O3-ZrO2-SrTiO3-BiScO3 was synthesized by the reaction method in the solid phase. The frequency and temperature dependences of the electrical conductivity of Y2O3-ZrO2-SrTiO3-BiScO3 ceramics are obtained. At a temperature above 500 K, the dielectric relaxation of the Y2O3-ZrO2-SrTiO3-BiScO3 ceramic system was detected, the activation energy of the relaxation process was 1.25 e

Features of optical characteristics of atmospheric aerosol in the Middle Urals

The results of studies into the aerosol optical depth (AOD) for the atmosphere in the Middle Urals in the spectrum range of 0.34-1.02 μm for 2004-2010 is presented. The interannual, annual, seasonal, and daily variations in the AOD are analyzed. The major statistical characteristics of the AOD, the parameters of the probability density function of distributions over different wave lengths, and the parameters of Angstrom's formula for the different seasons are calculated. The monitoring stations in the Russian segment of the AERONET network are ranked with respect to the AOD value. A shift from March to May in the spring maximum of the AOD is revealed in comparison with the results of the actinometric observations for the period of 1960-1986. A qualitative assessment is given to the influence of forest and peat fires in the region on the AOD. A classification of the states of aerosol haze in the atmosphere according to the AOD values is proposed. © 2013 Pleiades Publishing, Ltd