A Digital Deformation Vacuum Gauge with an LC-Generator

The design of a sylphon bellows sensor and the basic circuits of an LC-generator and of a microprocessor unit are presented. An analytical pressure–frequency conversion function and a special method of adjusting the sensor ensure an error of less than 0.05%. The dynamic range is up to 10⁵. The instruments developed cover the ranges 10³, 10⁴, and 10⁵ Pa.     

Catalyst for desulfurization of high-end-point diesel fuel

Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 3, pp. 34–35, March, 1992.     

Effect of HZSM zeolite in a catalyst on the indexes of hydroconversion of vacuum distillate

Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 3, pp. 25–26, March, 1991.     

Properties of slips of zirconia stabilized by oxides of rare earth metals

Casting properties of concentrated aqueous dispersions of zirconia stabilized by Y₂O₃, Si₂O₃, or a mixture of them are investigated. Optimum values of the pH, temperature, and slip concentration for the production of thin-walled vacuum-tight articles are established. Translated from Ogneupory, No. 3, pp. 12–15, March, 1995.     

Effect of the composition on the hardenability and properties of complexly alloyed steel for large-size parts

Large-sin parts are usually produced from steels with high hardenability. Intermediate-carbon improved chromium-nickel steels containing 1–3% Ni are used successfully for this purpose in Ukraine and in foreign countries. However, nickel is an expensive and scarce alloying element. The present work is devoted to steels with different compositions with the aim of choosing the most suitable one for large-size parts. The effect of alloying elements on the hardenability and mechanical properties of steels is investigated. A mathematical model is obtained.Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 5, pp. 13–17, May, 1995.     

Radiative-convective heat transfer for high-temperature two-phase flow around bodies

Some methods for determining the basic parameters of high-temperature two-phase flows and the results of investigation of radiative—convective heat transfer with a flowing body in a flow are presented.Notation x=x/d, x distance from the plasmatron nozzle exit section - d diameter of the plasmatron nozzle - q=q_p/q₀, q_p heat flux in the vicinity of the critical point of the surface in a flow given the gas flow - q₀ neat flux in the absence of particles in the flow - _p mass concentration of particles in the flow - G_p mass flow rate of the condensed phase - G_g mass flow rate of the gas phase Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 64, No. 3, pp. 300–303, March 1993.     

Sol–Gel Synthesis of Doped Vitreous Materials with the Use of Modified Aerosils

A novel variant of the sol–gel synthesis of silica glasses and optical composites containing transition-metal ions and nanoparticles is developed. Xerogels and glasses containing 10- to 46-nm particles are prepared with the use of aerosils modified by chromium oxide. The structural and physicochemical properties of chromium oxide–modified silica samples are investigated by X-ray powder diffraction, differential thermal analysis, thermal gravimetric analysis, and IR spectroscopy. The optical properties of transparent samples are examined using the transmission spectra and the refractive index distribution over the cross section of the xerogel preform. Xerogels and glasses containing nanoparticles of metallic copper and Cu _x Se are formed in the tetraethoxysilane–aerosil–copper nitrate system. An analysis of the optical properties of the nanocomposites demonstrates that SiO₂ : Cu _x Se nanocomposites can be used as passive Q switches.