A method of applying mathematical analysis and machine learning to organize predictive maintenance of an electric motor is considered using the example of the AIMU 112 MV6 U1 electric motor. A comprehensive technique for diagnosing the technical condition of an electric motor based on the analysis of vibration signals recorded by a three-axis accelerometer is proposed, which can be adapted to monitor the condition of various types of rotating equipment in industrial conditions.

Keywords: predictive maintenance, electric motor, vibration analysis, machine learning, neural networks, fault diagnosis, accelerometer, condition classification

During the construction and operation of oil and gas industry facilities, there are increased requirements for the quality of concrete. To this end, it is necessary to use new formulations and their preparation technology to obtain concretes of the required density with high strength, frost resistance, water resistance, crack resistance and, ultimately, increased durability. The use of a superplasticizing additive, basalt or polymer fiber and a nanocarbon additive in the specified amounts in the composition of fine-grained concrete contributed to an increase in the uniformity and density of the mixture and, accordingly, an increase in the strength characteristics of concrete at various hardening times. As a result of testing concrete samples for frost resistance, a mark of 400-500 cycles of freezing and thawing was obtained. This makes it possible to use these compositions of fine-grained concrete in harsh climatic and difficult engineering and geological conditions of construction and operation of oil and gas industry facilities.

Keywords: fibroconcrete, oil storage tanks, nanocarbon tubes, basalt fiber, superplasticizer

In article the concept "enterprise risk" is considered. The flowchart of a complex assessment of size of risks is submitted, the main qualitative and quantitative methods of risk analysis with definition of their merits and demerits are systematized. Ways of minimization of size of risks are considered.

Keywords: business, risk, enterprise risk, technique, methodology

The article discusses the Genesis of the categories of "risk" and "business risk". The role and importance of entrepreneurial risk in the Russian economy.

Keywords: entrepreneurship, risk, business risk, socio-economic developm

In article the concept "enterprise risk" is considered. The flowchart of a complex assessment of size of risks is submitted, the main qualitative and quantitative methods of risk analysis with definition of their merits and demerits are systematized. Ways of minimization of size of risks are considered.

Keywords: business, risk, enterprise risk, technique, methodology.

The synthesis of nanocomposite FeNi3/C based on the PAN, FeCl3 · 6H2O and NiCl2 · 6H2O, whereby the first time by the IR heating at 400 ÷ 700 ° C obtained nanocomposite FeNi3/C FeNi3 particle size of 10 to 80 nm are uniformly distributed UM. Using thermodynamic calculations based on the minimization of the Gibbs energy, confirmed the synthesis of nanocomposite FeNi3/C at T=400 ° C reduction of Fe and Ni with H2, produced during the process of carbonization of polyacrylonitrile with infrared heating. Designed as a nano material of the films can be effectively used as a carrier material for a magnetic information recording superdense. Recording density is achieved in such a carrier (85-100) Gb/dyuym2. ​

Keywords: nanocomposite, polyacrylonitrile, infrared heating, recording information, the magnetic properties, the carbon matrix

The spectra of thermally stimulated conduction currents (TSCC) in (TmBi)3(FeGa)5O12:Ca2+ ferrite-garnet films have been investigated with the purpose to reveal electrically active centres. The samples were fabricated by liquid phase epitaxy (LPE) from melt solution on the Gd3Ga5O12substrates with the crystallographic orientation (111) with the use of Bi-containing flux (without Pb). Increasing the concentration of Ca2+ions in the films were realised by increasing the concentration of CaO in the melt solution. The obtained films contained Ca2+ ions from 0,03 f.u to 0,1 f.u. With the help of standard thermoactivation current spectroscopy the spectra of the initial samples and samples subjected to ultraviolet radiation and negative corona discharge were obtained. The characteristic parameters of electrically active defects were calculated.

Keywords: thermally induced electrical current, ferrite garnet films, electrically active centres, deep-level capture, charge compensation, Ca- doping, ТСТП-spectra, temperature position