238 research outputs found

    Quality assessment bend finned tubes food systems heat transfer

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    Pasechko, L. Quality assessment bend finned tubes food systems heat transfer / L. Pasechko, A. Remnev, I. Dorensky, N. Myachikova // Π’ΠΎΠ²Π°Ρ€ΠΎΠ²Π΅Π΄Π½ΠΎ-тСхнологичСскиС аспСкты ΠΏΠΎΠ²Ρ‹ΡˆΠ΅Π½ΠΈΡ качСства ΠΈ конкурСнтоспособности ΠΏΠΎΡ‚Ρ€Π΅Π±ΠΈΡ‚Π΅Π»ΡŒΡΠΊΠΈΡ… Ρ‚ΠΎΠ²Π°Ρ€ΠΎΠ² : ΠΌΠ°Ρ‚Π΅Ρ€ΠΈΠ°Π»Ρ‹ ΠΌΠ΅ΠΆΠ΄ΡƒΠ½Π°Ρ€. Π½Π°ΡƒΡ‡.-ΠΏΡ€Π°ΠΊΡ‚. ΠΊΠΎΠ½Ρ„., ΠšΡƒΡ€ΡΠΊ, 12 Ρ„Π΅Π²Ρ€. 2015 Π³. - ΠšΡƒΡ€ΡΠΊ, 2015. - Π‘. 54-59.The proposed technology of bending monometallic and bimetallic finned tubes, produces quality bends with a minimum and the minimum possible radius of the bend pip

    Modelling of chemical reactions in plasma

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    The paper is devoted to theoretical investigation of interaction of pulsed high current electron beam with gas substance. As a result of the interaction the formation of chemical active plasma can be observed. One of the key parameter for theoretical analyze of the process is the electron distribution function. Within the framework of the Boltzmann approach we obtained the dynamical equation for electron distribution function depending on the electron energy, coordinate and time

    Nonequilibrium plasmachemical processes - the basis of future plasma technologies

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    Laws of molecule excitation in basic electronic condition have been considered. It was shown that nonequilibrium excitation of oscillatory degrees of molecule freedom was the most effective for initiation of chemical reactions. Plasmachemical processes proceeding in such conditions have a number of advantages allowing at their use in traditional manufactures decreasing power inputs and increasing productivity. Conditions realized at pulse excitation of gas mixes are also favorable for organizing chain chemical processes. Experimental data of chain chemical process realization in plasma of pulse electronic beam were presented. Other perspective plasma technologies - pulse radiolysis of liquid phase hydrocarbons at low temperature in conditions of electronic beam influence with high current density,initiation of carbon-black formation process in nonequilibrium conditions were also considere

    Impact of baking properties of wheat flour on change the parameters of kneading and rheological characteristics of the dough

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    The most important task facing the baking industry is to ensure the production of high quality products and of diverse range. Carrying out kneading has a great influence on the course of the technological process of preparation of wheat bread and its quality. Kneading the dough is the most important initial stage of the production of wheat bread, which occurs, first, the formation of the dough as a single homogeneous system, and, secondly, giving this system certain rheological properties, ensuring the optimal flow of all technological processe

    The methodology of the analysis and synthesis of rational choice recipes of cooking dishes

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    In the analysis and synthesis, an assessment is conducted according to the criteria of rational choice of the layout solution from the arrays of the formed set of recipes for the preparation of recommended dishes. From the array of new, well-known recipes and their technologies of preparation of various dishes by analysis and synthesis of layout solutions the methodology of rational choice of dishes, allowing for different criteria to establish the best possible choice is propose

    Development of technology and investigation of structure and properties of composites on the basis of shungit and polymer resins

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    The technology for manufacturing of composites based on polymer (epoxy) resins and shungites was developed by using of the electron irradiation and experienced samples with different percentages of the components a) 90 and 10 %, b) 70 and 30 %, c) 50 and 50 %, were manufactured respectively. It was carried out the series of experimental studies of the structure and properties of the obtained materials, including the atomic force microscope images were obtained and Raman spectra of these composites were measured and their analysis was per-formed

    The Effect of Doping on the Electrophysical Properties of Polycrystalline Diamond Films Deposited from an Abnormal Glow Discharge

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    The paper is focused on the study of the boron doping effect on the electrical characteristics, on the mechanism of charge carrier transfer, and on the energy spectrum of the localized defect states in the polycrystalline diamond films (PDF) deposited from an abnormal glow discharge. PDF doping enables to form the semiconductor layers of p-type conductivity, which have as good properties as those of PDF produced by the alternative methods. The doping reduces the degree of disorder in the film material brought by the growth defects, which determine the film electrical characteristics and electrotransfer mechanism. The PDF electrical characteristics and electrotransfer mechanism are determined by the defects of different nature, whose band gap energy levels have a continuous energy distribution. A p-type activation component is realized in the exchange of charge carriers between the valence band and shallow acceptor levels with the activation energy of 0.013-0.022 eV. Doping increases the effect of the hopping mechanism of the conductivity involving the localized states with a density of (1-6)β€’10{20} eV{-1}β€’cm{-3} distributed near the Fermi level, which is in the low half of the band gap

    Modelling of chemical reactions in plasma

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    The paper is devoted to theoretical investigation of interaction of pulsed high current electron beam with gas substance. As a result of the interaction the formation of chemical active plasma can be observed. One of the key parameter for theoretical analyze of the process is the electron distribution function. Within the framework of the Boltzmann approach we obtained the dynamical equation for electron distribution function depending on the electron energy, coordinate and time

    Study of the structure of crater at the surface of 12Cr18Ni10Ti steel irradiated by high-power pulsed ion beam

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    The topography of surface layers of 12Cr18Ni10Ti (AISI 321) steel after pulsed high-power Cn+ ion beams irradiation was investigated by scanning electron microscopy. A thin foil was prepared from the cross section of a crater with the use of a focused ion beam in the column of a two-beam electron-ion microscope. The microstructure and chemical composition of the crater were studied by transmission electron microscop

    Properties of the VT1-0 titanium surface modified by a pulsed ion beam

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    The physicomechanical properties of the VT1-0 titanium surface modified by a pulsed carbon ion beam at a pulse duration of 80 ns, an energy of 200 keV, a current density of 120 A/cm2, an energy density of 1.92 J/cm2, and various numbers of pulses (four regimes) are studied. Irradiation by the beam leads to hardening of a 1.8-ΞΌm-thick surface layer in titanium, a decrease in the hydrogen sorption rate, a decrease in the grain size, and the formation of twins
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