Autor: Zhuk, Volodymyr - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Experimental regulating parameters of bladder-type hydraulic accumulator
Autorzy:: Zhuk, Volodymyr
Verbovskyi, Orest
Popadiuk, Ihor
Powiązania:: https://bibliotekanauki.pl/articles/2174165.pdf
Data publikacji:: 2022
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: akumulator hydrauliczny
pojemność magazynowa
termodynamika
discharge cycle
hydraulic accumulator
non-stationary expansion
polytropic index
storage volume
Opis:: Experimental regulating parameters of the non-stationary expansion of air inside a bladder-type hydraulic accumulator, working with the simple short pipeline, are presented in the paper. The technique of continuous online monitoring of changes in time of volume and absolute air pressure inside the hydraulic accumulator during the discharge process has been improved. Three series of experimental studies of transient gas processes inside the accumulator at different values of the average volume flow rate are made. Tendencies of change of the integral parameters of the hydraulic accumulator are obtained and analyzed depending on the serial number of the discharge cycle. A general dependence of dimensionless storage volume Kreg on the polytropic index n in series # 1–3, approximated by single power-law dependence, is obtained. The systematic changes of integral parameters in each subsequent discharge cycle can be explained by the non-stationary transient thermodynamic processes in air inside the accumulator until the thermodynamic equilibrium with the ambient air parameters is reached.
Źródło:: International Journal of Applied Mechanics and Engineering; 2022, 27, 1; 232--243
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Facilities and problems of processing organic wastes by family-type biogas plants in Ukraine
Autorzy:: Voytovych, Ivan
Malovanyy, Myroslav
Zhuk, Volodymyr
Mukha, Orest
Powiązania:: https://bibliotekanauki.pl/articles/946898.pdf
Data publikacji:: 2020
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: anaerobic digestion
biogas plant
bioreactor
organic wastes
renewable energy
Opis:: The potential of organic wastes in Ukraine for biogas production and the prospects of using the family-type biogas plants for this purpose are shown. In the biogas laboratory of the Ukrainian National Forestry University the efficiency of the anaerobic mesophilic digestion of chicken manure of Poltava poultry farm, Kamianets-Podilsky poultry farm and sewage sludge from Lviv wastewater treatment plant (WWTP) was investigated. Different integral indicators of the biogas production and significantly different dynamics of its formation over time were obtained for three investigated substrates. The value of average specific biogas production from the sewage sludge of Lviv WWTP is 0.494 dm³∙(day∙kg FM)^–1, which is 5.1 times more comparing the chicken manure of Kamianets-Podilsky poultry farm and 8.0 times more than for the chicken manure of Poltava poultry farm. Strong negative effect of antibiotic treatment of chickens on methane content in the obtained biogas was established experimentally.
Źródło:: Journal of Water and Land Development; 2020, 45; 185-189
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Long-Term Retardation of Water Evaporation by Ultra-Thin Layers of Polydimethylsiloxanes in the Indoor Conditions
Autorzy:: Zhuk, Volodymyr
Rehush, Andriy
Burchenya, Sofiya
Hrytsiv, Oleh
Powiązania:: https://bibliotekanauki.pl/articles/1955471.pdf
Data publikacji:: 2021
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: evaporation
retardation
mass exchange coefficient
monolayer
polydimethylsiloxane
ultrathin layer
water balance
Opis:: Global climate change is causing water imbalances in many regions of the world to exceed evaporation over rainfall, leading to negative environmental consequences and economic losses. An effective way to reduce the water loss due to evaporation from the free surface of water bodies is the use of ultra-thin surface films of special additives. Insufficient stability and significant cost of additives based on fatty alcohols (hexadecanol, octadecanol and their mixtures) necessitate searching for new effective and more economical additives to reduce the water loss due to evaporation. A series of long-term (84 day) experimental studies of the effect of ultra-thin layers of polydimethylsiloxanes PDMS100 and PDMS-200 with a thickness of 1 μm on the rate of evaporation of water from the free surface was conducted under the indoor laboratory conditions. Both the dynamics of change in time of daily values of the effect of evaporation retardation by PDMS films, and total effect from the beginning of experiment were obtained. The maximum daily effects of evaporation retardation were obtained on the 6th day of the study; they are 39.5% for the PDMS-200 film and 32.9% for the PDMS-100 film, respectively. Linear correlations are obtained between the values of the mass transfer coefficient and the free surface temperature for water without additives, as well as for the same free surfaces with ultra-thin PDMS films. Overall integral efficiency of evaporation retardation by the PDMS-200 film with a thickness of 1 μm for 84 days was equal to 17.2%, while for the PDMS-100 film of the same thickness a reduction of evaporation by 5.7% was obtained. Due to the long-term activity, ultra-thin films of polydimethylsiloxanes, especially PDMS-200, can be a profitable alternative to the use of monolayers based on fatty alcohols.
Źródło:: Journal of Ecological Engineering; 2021, 22, 8; 33-40
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Experimental investigation of Microcystis aeruginosa cyanobacteria thickening to obtain a biomass for the energy production
Eksperymentalne badania nad zagęszczaniem cyjanobakterii Microcystis aeruginosa w celu uzyskania biomasy do produkcji energii
Autorzy:: Malovanyy, Myroslav
Zhuk, Volodymyr
Nykyforov, Volodymyr
Bordun, Igor
Balandiukh, Iurii
Leskiv, Galyna
Powiązania:: https://bibliotekanauki.pl/articles/293297.pdf
Data publikacji:: 2019
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: coagulation-flocculation
cyanobacteria
electric field
energy carriers
gravity sedimentation
suspension
thickening
cyjanobakterie
koagulacja-flokulacja
nośnik energii
pole elektryczne
sedymentacja grawitacyjna
zagęszczanie
zawiesina
Opis:: The purpose of the presented research is to analyse possible methods of thickening of the Microcystis aeruginosa (Kützing) Kützing cyanobacteria using the obtained concentrate as a biomass for the production of energy carriers and biologically valuable substances. Method of cyanobacteria thickening under the action of electric current and in the electric field, as well as the method of coagulation–flocculation and gravity thickening, was experimentally investigated in labscale conditions. Electrical methods didn't show positive results for the Microcystis aeruginosa thickening, despite the reports of their potential efficiency in a number of previous studies. The high efficiency of the method of coagulation– flocculation and gravity thickening of Microcystis aeruginosa suspensions was obtained. The optimum concentrations of industrial polymeric coagulants and flocculants for the thickening of Microcystis aeruginosa suspensions were defined in the range of about 10 ppm for the coagulants and about 1 ppm for the flocculants. Negative effect of the previous cavitational treatment of the diluted suspensions of Microcystis aeruginosa on the effectiveness of the coagulation–flocculation and gravitational thickening was confirmed experimentally. Hydrodynamic cavitation should be recommended to use after the thickening as the next step of processing of concentrated suspensions of Microcystis aeruginosa to achieve maximum extraction of energy carriers and biologically valuable substances.
Celem przedstawionych badań była analiza możliwych metod zagęszczania cyjanobakterii Microcystis aeruginosa (Kützing) Kützing do uzyskania koncentratu biomasy przydatnego do produkcji energii i substancji czynnych biologicznie. W skali laboratoryjnej analizowano metody zagęszczania pod wpływem prądu i pola elektrycznego oraz metody koagulacji– flokulacji i zagęszczania grawitacyjnego. Metody elektryczne nie dały pozytywnych wyników mimo wielu wcześniejszych badań na temat ich potencjalnej efektywności. Dużą efektywność uzyskano natomiast w przypadku metod koagulacji– flokulacji i grawitacyjnego zagęszczania zawiesiny Microcystis aeruginosa. Optymalne stężenie przemysłowych polimerowych koagulantów użytych do zagęszczania ustalono na 10 ppm, a flokulantów – na 1 ppm. Doświadczalnie potwierdzono ujemny wpływ wcześniejszego poddawania rozcieńczonych roztworów Microcystis aeruginosa działaniu kawitacji na skuteczność zagęszczania metodami koagulacji i flokulacji oraz zagęszczania grawitacyjnego. Hydrodynamiczną kawitację zaleca się stosować po zagęszczaniu, jako następny etap w przetwarzaniu zagęszczonej zawiesiny Microcystis aeruginosa do postaci nośnika energii i pozyskania substancji biologicznie czynnych.
Źródło:: Journal of Water and Land Development; 2019, 43; 113-119
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Dependency Between the Total and Effective Imperviousness for Residential Quarters of the Lviv City
Autorzy:: Zhuk, Volodymyr
Vovk, Lesya
Matlai, Ivan
Popadiuk, Ihor
Mysak, Ihor
Fasuliak, Vadym
Powiązania:: https://bibliotekanauki.pl/articles/124213.pdf
Data publikacji:: 2020
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: total imperviousness
effective imperviousness
stormwater modelling
surface runoff
Opis:: A detailed hydrologic analysis was performed using geographic information systems and field investigations for thirty residential quarters in the Franko district of the Lviv city, Ukraine. All investigated quarters are located at the territory of the Baltic Sea catchment of the Lviv city, and the surface runoff from this area flows to the Lviv wastewater treatment plant. The total area of the investigated sub-catchment is 348.5 ha, including 58.46 % of impervious covers, 41.17 % of green spaces and 0.37 % of water bodies. The share of total impervious surfaces for each of the 30 analyzed quarters varies from 0.329 to 0.929, and the effective imperviousness – from 0.222 to 0.917. The correlation between the total and effective imperviousness was described by the power law dependency p_ef=(p_tot) ⁿ. Two approaches were used to describe the relationship between the total and the effective imperviousness: 1) using all 30 empirical results for each quarter; 2) using the average values of the imperviousness of the total subcatchment. The obtained values of the power law exponent for these two empirical approaches are n₁=1.308 and n₂=1.275, respectively or 7.2 % and 9.6 % less, respectively, comparing to the corresponding value n=1.41 in the Livingston’s & Veenhuis’ approximation, obtained for 14 different highly urbanized quarters of Denver city. On the other hand, the power law exponents are 3.9% and 1.3% higher, respectively, comparing to the corresponding value n=1.259 in the approximation for the 900 km² semi-urban watershed in Marion County, Georgia, USA.
Źródło:: Journal of Ecological Engineering; 2020, 21, 5; 56-62
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Perspective Technologies of the Treatment of the Wastewaters with High Content of Organic Pollutants and Ammoniacal Nitrogen
Autorzy:: Malovanyy, Myroslav
Moroz, Oleksandr
Hnatush, Svitlana
Maslovska, Olga
Zhuk, Volodymyr
Petrushka, Ihor
Nykyforov, Volodymyr
Sereda, Andriy
Powiązania:: https://bibliotekanauki.pl/articles/124528.pdf
Data publikacji:: 2019
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: leachate treatment
aerated lagoon
microbiocenosis
biofuels
wastewater treatment plant
Opis:: The paper analyzes the advanced technologies of wastewater treatment with a high content of organic pollutants and ammonium ions. Two different bi-stage scenarios for the treatment of such effluents are proposed. The first scenario includes the pretreatment in aerated lagoons and the final stage at the wastewater treatment plants after appropriate dilution with municipal sewages. The second scenario also includes the first stage in aerated lagoons with a tertiary treatment at the plant for cyanobacteria cultivation with the use of obtained biomass for biofuels production. The effects of the aeration periodicity on the leachate treatment efficiency and also on the composition of microbiocenosis in the aerated lagoons were investigated. The leachates of the Lviv landfill of municipal solid waste (MSW) were used in experimental investigations. The Lviv landfill of MSW was used for domestic and industrial wastes deposition for almost six decades, since the 1960s. It was found that the highest effect of ammoniacal nitrogen removal was obtained in the mode of periodic aeration, with the cycle duration of two hours including the one-hour aeration. It was found that the microorganisms extracted from the leachates of the Lviv MSW landfill are prospective for the new biotechnologies of treatment of the highly concentrated wastewaters, since this microbiocenosis is resistant to the widespread pollutants, in particular to heavy metal ions.
Źródło:: Journal of Ecological Engineering; 2019, 20, 2; 8-15
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Use of Microbiocenosis Immobilized on Carrer in Technologies of Biological Treatment of Surface and Wastewater
Autorzy:: Malovanyy, Myroslav
Masikevych, Andrij
Masikevych, Yurij
Blyzniuk, Mykola
Tymchuk, Ivan
Zhuk, Volodymyr
Hnatush, Svitlana
Kharlamova, Olena
Iurchenko, Valentyna
Vlasyk, Leonid
Powiązania:: https://bibliotekanauki.pl/articles/2173371.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: microorganisms
immobilization on carrer
formation of microbiocenosis
periphyton
aerated lagoon
biological treatment
Opis:: The role of fibrous carrer in the formation of microbiocenosis, which provides purification of aquatic environments, was studied. The prospects of using the "Vija" fibrous carrer for cleaning the watercourses of mountainous areas were studied. The species composition, as well as the kinetics of periphyton formation on fibrous carrer, were established. The species composition of the microbiocenosis, which is formed on carrer in the mode of active aeration of landfill filtrates and the prospects of using the method of aerated lagoon for filtrate treatment were studied.
Źródło:: Journal of Ecological Engineering; 2022, 23, 9; 34--43
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: An experimental study of the vibrational characteristics of a diamond circular blade using electronic speckle-pattern interferometry and fem
Autorzy:: Tkach, Mykhaylo
Halynkin, Yurii
Proskurin, Arkadii
Zhuk, Irina
Kluchnyk, Volodymyr
Bobylev, Igor
Powiązania:: https://bibliotekanauki.pl/articles/1837945.pdf
Data publikacji:: 2021
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:: interferometry
speckle pattern
correlation fringes
vibration analysis
Opis:: The compact installation and technology for determining vibration characteristics by the ESPI method has been created. The experimental determination of the dynamic characteristics of a diamond circular blade with a diameter of 203.4 mm and a thickness of 1.19 mm using real-time electronic speckle interferometry is presented. 15 mode shapes of vibration were detected in the range from 100 to 5000 Hz. The program calculation of the natural frequencies and mode shapes is carried out for three values of the clamping inner diameter (42 mm, 44 mm, 46 mm). The options for calculating a disk with a rim and without a rim are considered. It is shown that the minimum mean squared error of the calculation is achieved for the values of the diameter of the disk 46 mm, 42 mm and 44 mm for the number of nodal circles 0, 1 and 2, respectively. To verify the accuracy of the interferometer, experimental, computational and analytical studies of console steel rod 200 x 22.25 x 3.78 mm in size were carried out.
Źródło:: Acta Mechanica et Automatica; 2021, 15, 1; 16-23
1898-4088
2300-5319
Pojawia się w:: Acta Mechanica et Automatica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Local difference threshold learning in filtering normal white noise
Proces uczenia względem lokalnego progu różnicy w filtrowaniu normalnego szumu białego
Autorzy:: Timchenko, Leonid
Kokriatskaia, Natalia
Tverdomed, Volodymyr
Kalashnik, Natalia
Shvarts, Iryna
Plisenko, Vladyslav
Zhuk, Dmytro
Kumargazhanova, Saule
Powiązania:: https://bibliotekanauki.pl/articles/27315427.pdf
Data publikacji:: 2023
Wydawca:: Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:: training
local difference threshold
filtering normal white noise
uczenie
lokalny próg różnicy
filtrowanie normalnego białego szumu
Opis:: The article was aimed at studying the process of learning by the local difference threshold when filtering normal white noise. The existing learning algorithms for image processing were analyzed and their advantages and disadvantages were identified. The influence of normal white noiseon the recognition process is considered. A method for organizing the learning process of the correlator with image preprocessing by theGQP methodhas been developed. The dependence of the average value of readings of the rank CCF (RCCF) of GQPs of the reference andcurrent images, representing realizations of normal white noise, on the probability of formation of readings of zero GQP is determined. Two versions of the learning algorithm according to the described learning method are proposed. A technique for determining the algorithm efficiency estimate is proposed.
Celem pracybyło zbadanie procesu uczenia za pomocą lokalnego progu różnicy podczas filtrowania normalnego białego szumu. Przeanalizowano istniejące algorytmy uczenia do przetwarzania obrazu oraz zidentyfikowano ich zalety i wady. Uwzględniono wpływ normalnego białego szumu na proces rozpoznawania. Opracowano metodę organizacji procesu uczenia korelatora z przetwarzaniem wstępnym obrazu przyużyciu metody GQP. Określono zależność średniej wartości próbek rangi CCF (RCCF) GQP obrazów referencyjnego i bieżącego, reprezentujących realizacje normalnego białego szumu, od prawdopodobieństwa utworzenia zerowych próbek GQP. Zaproponowano dwie wersje algorytmu uczenia opartegona opisanej metodologii uczenia. Zaproponowano metodę określania szacunkowej skuteczności algorytmu.
Źródło:: Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2023, 13, 2; 69--73
2083-0157
2391-6761
Pojawia się w:: Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:: Biblioteka Nauki

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