Inelastic, elastic characteristics of SiO2, porous polystyrene and automated system

Онанко, А. П.; Charny, D. V.; Onanko, Y. A.; Кulish, N. P.; Dmutrenko, O. P.; Попов, С. А.

doi:10.3997/2214-4609.201902110

Cited by 7 publications

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“…In the case of adsorption by a layer of filter media, instead of the porosity of the intergranular space, the term porosity of the filter media layer is often used [10][11][12][13][14][15]. Table 1 presents the most important correlations.…”

Section: Results Of the Study And Their Discussionmentioning

confidence: 99%

Kinetic Model of the Initial Stage of the Process of Colloid Retention by the Pore Space of Sokyrnite

Onanko,

Onanko

2023

LRaWM

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The physicochemical phenomena occurring on the surface of sokyrnite grains in complex system "medium grain surface - dispersion medium - surface of suspended particles" have been studied. The framework structure of the sokyrnite structure (rough surface, presence of pores and channels, entrance windows) enables it to work as a "molecular sieve" and to be a highly efficient sorbent-ion exchanger. The porosity of the filter media was determined. Namely: the porosity of the media grains (also called the internal porosity) and the porosity of the intergranular space (media layer). The internal surface area, which is an important quality parameter for sokyrnite as a physical adsorbent, was determined. Several other properties associated with sokyrnite and retained colloidal particles, which affect the strength of the physical adsorption, were investigated. The relationships characterizing the parameters of the zeolite filter media layer were formulated and given. In these studies, the requirements for determining the filter charging time and the optimal technological and design parameters of the filter, according to the operating conditions at a specific water treatment facility, were considered. They determined the need for more detailed research and development of a kinetic model for the initial stage of filtering an aqueous suspension through a filter containing zeolite media. A differential material balance expression for the zeolite filter was formulated. Based on the developed kinetic model, comparative experiments on iron removal from underground natural waters using the above-mentioned filter material were planned and carried out. The mechanism of the distribution of iron ions in the filter space due to the phenomenon of diffusion, in accordance with Fick's first law, is given. The mechanism of iron flake retention by the zeolite media pore space, the consolidation of which occurs during the transition of iron from a divalent to trivalent form, is described. The factors that interfere with autocatalytic processes in iron sediments were described. The dynamics of changes in the concentration of iron in the filtrate after the end of the ion-exchange resource of sokyrnite were studied.

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Section: Results Of the Study And Their Discussionmentioning

confidence: 99%

Kinetic Model of the Initial Stage of the Process of Colloid Retention by the Pore Space of Sokyrnite

Onanko,

Onanko

2023

LRaWM

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“…Metallography optical supervision of microstructure by means of the microscope "LOMO MVT" (Leningrad Optical Mechanical Association) and AFM was used. 20,21 A block diagram of the device for the triad attachment and excitation of the bending resonant vibrations of SiO 2 /Si wafer at frequency f ┴ ≈ 1 kHz in vacuum P ≈ 10 −2 Pa is shown in Fig. 3.…”

Section: Methodsmentioning

confidence: 99%

Anelastic Internal Friction and Mechanical Spectroscopy of SiO₂/Si Wafers

Onanko,

Kuzmych,

Onanko

et al. 2024

ECS J. Solid State Sci. Technol.

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In this work, after electron irradiation and X-ray, the outcomes of the evaluation dynamic characteristics of interstitial atoms Sij , vacancy V, and O-complexes were evaluated to account for the annealing conditions to derive specific structural defects in the SiO2/Si wafer. A non-destructive method, which allows the determination of the internal friction difference ΔQ-1/Q-1 0 of the elastic vibration of structural defects of dislocations with density ND and the depth of the broken layer hb , is offered for the SiO2/Si wafer. The method was developed, the installation was designed and manufactured for the excitation and registration of damped bending resonant oscillations in a SiO2/Si disc-shaped wafer with a thickness hSiO2 ≈ 100 nm, his = 300÷500×103 nm, and diameter D = 60÷100×10-3 m to measure the structurally sensitive internal friction Q-1 in vacuum P ≈ 10-2 Pa. Measurement of the internal friction background Q-1 0 at harmonic frequencies f0 and f2 allowed us to experimentally determine the nodal lines of the oscillating disks.

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“…References 1. Kovalenko, P., Rokochinskiy, A., Jeznach, J., Volk, P., Koptyuk, R. & Prykhodko, N. (2019). Evaluation of climate change in Polissia region and ways of adaptation to it.…”

Section: зрошення -осушенняmentioning

confidence: 99%

“…URL: https://www.researchgate.net/ publication/261471672 2. Berbel, J., Borrego-Marin, M.M., Exposito, A., Giannoccaro, G., Montilla-Lopez, N.M., & Roseta-Palma, C (2019)…”

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2023

LRaWM

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The paper presents a new approach to improving the methods of design and calculation of drainage systems and their technical elements in the drainage mode and in the subsoil moistening mode. This was done on the basis of substantiating the connection of all technical elements of the system and taking into account the influence of their work efficiency on the effectiveness of regulating the water regime of drained lands. The existence and structure of the hierarchical and hydraulic relationship between the parameters of soil flow movement, the parameters of the closed collector drainage network, and the parameters of canals and structures of drainage systems were determined based on the application of the system methodology. A physical model, a structural model, a mathematical model, and a hydraulic model of the drainage system were developed. By using these models, the principles of determining the parameters of the hydraulic characteristics of drainage or water supply (discharge, pressure, velocity etc.) for all elements (drained massif of reclaimed field, collector and drainage network, open canals of the network, main canal, water intake) in the entire range of variation with possible consideration of changes in slopes were obtained. The considered approach will make it possible to evaluate the efficiency of water flow movement simultaneously on every technical element and on the drainage system as their interconnection. In the future, this will make it possible to improve the methods of designing and calculating the technological and structural parameters of drainage systems, and thereby ensure the overall technical, technological, economic, and ecological efficiency of their functioning in accordance with modern conditions and requirements. This is a further improvement of the methods of design and calculation of drainage systems and their technical elements, taking into account the structural, hierarchical, and hydraulic relationship between them in accordance with modern conditions and requirements. This will make it possible to increase the validity and general technical, technological, ecological and economic efficiency of the creation and functioning of drainage systems during the implementation of adaptive measures regarding the changes in climatic conditions and the level of agricultural production in the area of drainage reclamation, for example, in Ukrainian Polissia. It will also provide an opportunity to ensure the necessary level of food security in the region and the country as a whole in the war and post war periods.

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Inelastic, elastic characteristics of SiO2, porous polystyrene and automated system

Cited by 7 publications

References 0 publications

Kinetic Model of the Initial Stage of the Process of Colloid Retention by the Pore Space of Sokyrnite

Kinetic Model of the Initial Stage of the Process of Colloid Retention by the Pore Space of Sokyrnite

Anelastic Internal Friction and Mechanical Spectroscopy of SiO₂/Si Wafers

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Inelastic, elastic characteristics of SiO2, porous polystyrene and automated system

Cited by 7 publications

References 0 publications

Kinetic Model of the Initial Stage of the Process of Colloid Retention by the Pore Space of Sokyrnite

Kinetic Model of the Initial Stage of the Process of Colloid Retention by the Pore Space of Sokyrnite

Anelastic Internal Friction and Mechanical Spectroscopy of SiO2/Si Wafers

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Anelastic Internal Friction and Mechanical Spectroscopy of SiO₂/Si Wafers