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The basic idea of the study is to evaluate the acoustic, vibration, physical-mechanical and damping properties of steels, and to produce steels with nanostructured coatings with enhanced damping properties, providing noise and vibration reduction. The study represented the excitation by mechanical shocks of a steel plate, each with a different level of damping. It has been determined that the sources of vibration damping in metallic-paper, encapsulated (MGB) steels MBG-1, MBG-2, MBG-3 with nanostructure coating in the amplitude-dependent region are elastic twinning, diffusion-free reversible phase transformation and magnetic-elastic energy dissipation. As a result of the studies conducted, new damping metallic materials based on iron have been developed.

Currently there is an acute shortage of fibres and proteins in the human diet, resulting in various diseases. The modern market needs a product capable of diversifying the range in the sector of functional, dietary flour confectionery. To this end, the article shows one of the ways to improve the macronutrient composition of waffles, especially with regard to the protein-carbohydrate component of the product. Laboratory analysis showed that the introduction of pea protein, chicory root syrup and apple fiber into the composition of flour and confectionery increased protein content by 3.3% in wafers made of rice flour only and by 5.6% in waffles made of a mixture of whole grains and rice flour. The amount of sucrose decreased in «Rice» waffles by 2.6% and by 2.3% in «Wheat-rice» waffles, and the amount of fiber on average is 3-4 times more, compared to the control sample. In comparison with the control sample, increased the average number of essential amino acids such as: lysine – in 1.5 times; phenylalanine – in 1.25 times; leucine and isoleucine – in 0.8 times; methionine – in 1.5 times, threonine – in 3 times. Thus, the study resulted in the development of dietary plant based soft waffles with improved macronutrient composition, able to expand the range of functional products and can be recommended for dietary nutrition.

Acoustic and damping properties of known and test chromium steels are investigated after heat treatment. Test metal microstructure and physicomechanical properties are studied. The increase in sound energy attenuation for a martensitic structure is determined. As a result of steel quenching, attenuation is reduced due to dislocation annihilation.Physicomechanical properties of structural steels and alloys (strength, ductility, production, and others) are inadequate for evaluating their noise and vibration properties. Constructors and technologists perceive a shortage of information for acoustic and damping properties of steels and alloys used for industrial equipment components.Chromium steels 30Kh, 35Kh, and 40KhRA are used for gear wheels and levers. Operation of these components and assemblies is accompanied by intense noise and vibration. An effective method for impact noise reduction is use of damping alloys, which provide a reduction in noise at its source of generation, and create acoustic comfort within a workplace [1-6]. However, damping alloys are used extremely rarely for replacing extensively used steels. Use of other noise reduction methods for the abovementioned components and assemblies is ineffective due to the cumbersome nature of a workspace (sound insulation, sound absorption), an increase in fi re hazard and dustiness (sound absorption), and masking of warning signals (use of individual means of protection).The aim of this work is development of new chromium steels exhibiting improved damping properties and providing a reduction in production noise, and creation of acoustic comfort.Chromium steels (30Kh, 35Kh, and 40KhRA) and steels of developed compositions Nos. 1, 2, and 3 were studied. Acoustic (maximum sound level and sound pressure level in octave frequency bands) and vibration (vibration acceleration levels) were determined for the alloys. The functions of steels 30Kh, 35Kh, and 30KhRA are as follows: axles, shafts, levers, bolts, nuts, and other small components, and also gear wheels, shafts, and critically loaded pins; in addition, clutch shafts, gear shift levels, speed gearbox shafts, balancers, and tractor motor exhaust valves. Mechanical properties and chemical composition of the test steels are provided in Tables 1 and 2. Test steels Nos. 1, 2, and 3 were melted in an induction furnace, and specimens were poured into a chill mold. A device was selected for comprehensive determination of acoustic and vibration properties of plate and tubular steel specimens [7] with subsequent modernization in order to study acoustic and vibration properties of steels. The device operates as follows (Fig. 1). A striker ball 6 is placed on an inclined plane 5 and rolls down it, completing free fall to the geometric center of a plate specimen 3. The striker ball 6 bounces from it and falls into a ball receptacle 11. The noise from impact of

E d i t o r i n c h i e f ZHURINOV MuratZhurinovich, doctor of chemistry, professor, academician of NAS RK, president of the National Academy of Sciences of the Republic of Kazakhstan, general director of JSC "Institute of fuel, catalysis and electrochemistry named after D.V. Sokolsky» (Almaty, Kazakhstan) H = 4 E d i t o r i a l b o a r d: ABSAMETOV Malis Kudysovich, (deputy editor-in-chief), doctor of geological and mineralogical sciences, professor, academician of NAS RK, director of the Akhmedsafin Institute of hydrogeology and hydrophysics (Almaty, Kazakhstan) H = 2 ZHOLTAEV Geroy Zholtaevich, (deputy editor-in-chief), doctor of geological and mineralogical sciences, professor, director of the institute of geological sciences named after K.I. Satpayev (Almaty, Kazakhstan) Н=2 SNOW Daniel, Ph.D, associate professor, director of the labotatory of water sciences, Nebraska University (Nebraska, USA) H = 32 Zeltman Reymar, Ph.D, head of research department in petrology and mineral deposits in the Earth sciences section of the museum of natural history (London, England) H = 37 PANFILOV Mikhail Borisovich, doctor of technical sciences, professor at the Nancy University (Nancy, France) Н=15 SHEN Ping, Ph.D, deputy director of the Committee for Mining geology of the China geological Society, Fellow of the American association of economic geologists (Beijing, China) H = 25 FISCHER Axel, Ph.D, associate professor, Dresden University of technology (Dresden, Germany) H = 6 KONTOROVICH Aleksey Emilievich, doctor of geological and mineralogical sciences, professor, academician of RAS, Trofimuk Institute of petroleum geology and geophysics SB RAS (Novosibirsk, Russia) H = 19 ABSADYKOV Bakhyt Narikbaevich, doctor of technical sciences, professor, corresponding member of NAS RK, Bekturov Institute of chemical sciences (Almaty, Kazakhstan) H = 5 AGABEKOV Vladimir Enokovich, doctor of chemistry, academician of NAS of Belarus, honorary director of the Institute of chemistry of new materials (Minsk, Belarus) H = 13 KATALIN Stephan, Ph.D, associate professor, Technical university (Dresden, Berlin) H = 20 SEITMURATOVA Eleonora Yusupovna, doctor of geological and mineralogical sciences, professor, corresponding member of NAS RK, head of the laboratory of the Institute of geological sciences named after K.I. Satpayev (Almaty, Kazakhstan) Н=11 SAGINTAYEV Zhanay, Ph.D, associate professor, Nazarbayev University (Nursultan, Kazakhstan) H = 11 FRATTINI Paolo, Ph.D, associate professor, university of Milano-Bicocca (Milan, Italy) H = 28 News of the National Academy of Sciences of the Republic of Kazakhstan. Series of geology and technology sciences.