Appropriate assessment of the technical condition of internal combustion engines allows determining optimal values for standards of their technical operation, adjusting the parameters of maintenance and repair process operations, and, as a result, reducing the cost of their effective operation. The article is devoted to the use of the Bayes algorithm for assessing the technical condition of internal combustion engines. This algorithm allows using statistical data on repair and maintenance of internal combustion engines, wherein the missing information is determined by the dynamic systems modeling method. The choice of transitional functions of constituent elements of internal combustion engines as diagnostic parameters increases the reliability of obtained results.
Experiments on self-similar Rayleigh-Taylor instability-induced mixing in gases in the Earth's gravity conducted on the OSA facility at the Russian Federal Nuclear Center-VNIITF are described. These experiments are distinguished from other experiments, usually performed with immiscible liquids in a tank or with miscible liquids initially separated by a solid barrier that is retracted, in that a membrane~of ;1 mm thickness! with liquid soap film embedded in a thin wire array~with microconductors of diameter 20 mm and with a spacing of 4 mm! initially separates the fluids. An electric current to initiate the fluid interpenetration and mixing destroys the membrane. Experiments performed for three different Atwood numbers are described: in SF6-Ar with A ϭ 0.54, in SF6-He with A ϭ 0.94, and in Kr-Ar with A ϭ 0.35. Various parameters of the mixing were measured from Schlieren photographs. In particular, the dimensionless rate of mixing front growth is a ϭ 0.078.
The structure and the main characteristics of the multi-purpose soil database “Ukrainian Soil Properties”, de- signed on the basis of the data of long-term soil studies comprisin, analysis of the samples and mapping of the soils are presented. The attributive data for the 2,075 soil profiles are ranked and grouped into nine separate thematic tables. The key field of each table is the indexing number for the soil profile. It ensures a genuine link between the profile sets of attributive data and the cartographic units on the soil maps in the different scales, on the map chart of economic and agricultural zoning and the administrative map of Ukraine. The main indicators of the soil properties were determined; the legends of both Ukrainian and the WRB classifications were used to code the names of soils. The main results of scientific research were listed, including the ones, obtained in the framework of international projects, implemented using the mentioned database.
The article discusses the effect of air supply (excess air coefficient) on the effective performance of the engine of a machine-tractor unit with an unsteady load. The analysis of the influence of unsteady load on the engine performance of the machine-tractor unit (MTU) is given. Theoretical studies are presented to determine the effective performance of the MTU engine under unsteady load and their comparative analysis with the results of experimental data. This is necessary to verify the adequacy of theoretical dependencies with the results of experimental studies.
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