Wyniki wyszukiwania - Biblioteka Nauki

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Wybrane zastosowanie skał, minerałów oraz nowoczesnych nanomateriałów w biotechnologii

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Odrobina A. , Pajdak A.

Prace Instytutu Mechaniki Górotworu PAN

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2020

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tom T. 22, nr 1-4

93--101

PL

W artykule zaprezentowano wybrane zastosowania materiałów pochodzenia naturalnego oraz antropogenicznego w kilku gałęziach biotechnologii. Wśród materiałów naturalnych uwzględniono zeolity pochodzące z węgla kamiennego, węgiel brunatny, kalcyt, kwarc, piryt, hydroksyapatyt i żel krzemionkowy. Wśród materiałów syntetycznych opisano zastosowanie w biotechnologii struktur metaloorganicznych MOF, węgla aktywnego i nanorurek węglowych. Przykłady zastosowań wzbogacono o wyniki analiz strukturalnych tych materiałów, które przeprowadzono w ramach prac badawczych Instytutu Mechaniki Górotworu PAN.

EN

The article presents selected applications of materials of natural and anthropogenic origin in several branches of biotechnology. Natural materials include zeolites derived from hard coal, lignite, calcite, quartz, pyrite, hydroxyapatite and silica gel. Synthetic materials include the use of metal–organic framework MOF, active carbon and carbon nanotubes in the biotechnology. Examples of applications were enriched with the results of structural analyzes of these materials, which were carried out as part of the research work of the Strata Mechanics Research Institute of the Polish Academy of Sciences.

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Experimental study of thermal effects in cooling a circular cylinder in lock-on conditions

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Gnatowski A. , Sosnowski M. , Pajdak A. , Sobczyk J.

Advances in Science and Technology. Research Journal

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2018

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tom Vol. 12, no 2

42--51

EN

The paper presents a simple method for determining the phenomenon of unsteady thermal effects in cooling a circular cylinder. The research has been undertaken in order to explain the thermoaerodynamic processes, which are characterized by the turbulent structure of the flow around a stationary rigid heated cylinder cooled by the oscillating flow. The forced convection of heat occurs in the presence of not only random velocity fluctuation but also in the conditions of periodical forms of motion caused mainly by the process of vortex going down and externally formed oscillations of the inflow. The Nusselt number was evaluated at various frequencies of disturbances of the inlet velocity field, especially in lock-on conditions, on the surface of the circular cylinder versus angular location Θ = 0 180°. The subject of the study focuses on the analysis of current state of the problem and development of the method to measure and calculate basic values that characterize unsteady processes of thermal effects on the circular cylinder surface and indication of the directions of further work.

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Wpływ wilgoci na pojemność sorpcyjną węgla kamiennego względem CH4 i CO2

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Kudasik M. , Pajdak A. , Skoczylas N. , Braga L. T. P.

Prace Instytutu Mechaniki Górotworu PAN

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2019

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tom T. 21, nr 1-4

83--87

PL

W pracy wykonano badania wpływu wilgoci na właściwości sorpcyjne węgla kamiennego względem metanu i dwutlenku węgla. Zgodnie z literaturą wilgoć obecna w węglu znacznie ogranicza zdolność sorpcji gazów, w tym w większym stopniu ma to miejsce w przypadku CH4, niż CO2. Zaprezentowane w artykule badania obejmowały analizy próbek węgla z kopalni „Sobieski”, rozdrobnionego do klasy ziarnowej 0,20-0,25 mm. Badania przeprowadzono w warunkach izotermicznych i izobarycznych za pomocą autorskiego urządzenia wolumetrycznego – sorpcjomatu manometrycznego. Wyniki badan wykazały, że wilgoć ogranicza sorpcję CH4 i CO2 w podobnym stopniu. Największy spadek pojemności sorpcyjnej odnotowano pomiędzy próbkami suchymi, a zawierającymi odpowiednio 2.8% wilgoci (dla CH4 jako adsorbatu) oraz 2.5% (dla CO2). Przy dalszym nasycaniu próbek parą wodną, odnotowane spadki pojemności sorpcyjnej były na niższym poziomie.

EN

In the paper the results of the influence of moisture on the sorption properties of hard coal in relation to methane and carbon dioxide were presented. According to the literature, moisture present significantly reduces the sorption capacity of coal to gases, including to a greater extent CH4 than CO2. The research presented in the article included analyses of coal samples from the “Sobieski” mine, crushed to grain class 0.20-0.25 mm. The research was carried out under isothermal and isobaric conditions with the use of an original volumetric device – manometric sorption analyser. The results showed that moisture limits the sorption of coal to CH4 and CO2 to a similar degree. The greatest decrease in sorption capacity was recorded between dry samples and wet samples containing 2.8% moisture (for CH4 as adsorbate) and 2.5% (for CO2) respectively. With further saturation of the samples with water vapour, the recorded decrease in sorption capacity were at a lower level.

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Influence of grain size and gas pressure on diffusion kinetics and CH 4 sorption isotherm on coal

70%

Kozieł K. , Gajda A. , Skiba M. , Skoczylas N. , Pajdak A.

Archives of Mining Sciences

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2024

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tom Vol. 69, no. 1

3--23

EN

The article presents a methodology for predicting the impact of the longwall shearer’s control parameter on methane emission rate to the working of a longwall based on computational fluid dynamics (CFD) methods. The methodology was applied to the Z-11a longwall panel conditions at the Jankowice Hard Coal Mine. The results of the methane emissions rate in the working of a longwall for three variations of the position of the longwall shearer are shown and discussed. The modelled issue’s geometry, numerical grid, assumptions, and boundary conditions are presented. The filtration parameters of goafs are discussed. Relationships to estimate the various sources of methane emissions into the air flowing around the longwall panel Z-11a are presented. The results of the model tests were compared with the mining data in the Z-11a longwall panel at the Jankowice Hard Coal Mine.