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Wyszukujesz frazę "Gondek, H." wg kryterium: Autor


Wyświetlanie 1-4 z 4
Tytuł:
Tests of an Innovative Controller Designed to Control the Powered Roof Support
Autorzy:
Szurgacz, D.
Gondek, H.
Powiązania:
https://bibliotekanauki.pl/articles/2064962.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Tematy:
powered longwall system
powered roof support
control system
working parameters
visualization
Opis:
The article presents the methodology and results of tests of a prototype controller designed for the electrohydraulic control system of a powered roof support. This controller is the basic part of the developed, innovative control system. The tests were carried out on a custom-designed testing station, equipped with one section of a roof support. The aim of the research was to check the functionality and speed of the controller's response while working with the actual support section. The tested controller and the control system has a modular structure, which greatly facilitates its operation and use. Measurements of control functions were carried out on the controller connected to the electrohydraulic control block. The research mainly focused on determining the period starting from the moment of providing the signal to the moment of switching on the basic functions performed by the support section. The obtained results confirm the assumptions made. The controller's operation is very stable, and its response times are very short. It can therefore be assumed that the tested controller is correctly designed and constructed. This creates great possibilities for its practical application in the built-in system for controlling the roof support. This may be particularly important in the case of high-efficiency longwall complexes, for which wireless control of the support is planned to be used. The presented research methodology and obtained results should therefore be an important source of information in the field of testing controllers for powered roof supports.
Źródło:
Multidisciplinary Aspects of Production Engineering; 2018, 1, 1; 223--231
2545-2827
Pojawia się w:
Multidisciplinary Aspects of Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Znaczenie mikroporowatych materiałów metaloorganicznych (MOF ) dla potrzeb magazynowania wodoru
Microporous metal-organic frameworks for hydrogen storage
Autorzy:
Czub, J.
Gondek, Ł
Figiel, H.
Powiązania:
https://bibliotekanauki.pl/articles/172476.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
materiały metalo-organiczne
materiały mikroporowate
MOF
adsorpcja
magazynowanie wodoru
metal-organic frameworks
microporous materials
adsorption
hydrogen storage
Opis:
Currently, the metal-organic frameworks (MOF s) are considered among the most promising materials for hydrogen storage. In this paper, the properties of MOF s that are particularly important for application purposes are presented. Examples include simplicity of their syntheses on an industrial scale, low synthesis costs, high thermal stability and durability, an excellent repeatability and very low degree of degradation during cyclic hydrogen loading and recovery. On the other hand, the potential use of MOF s as hydrogen reservoirs is to some extent limited due to the fact that the low temperatures of 77 K are required for effective adsorption of hydrogen in the microporous structures of MOF s. Nowadays, the research on MOF s is carried in two directions. In particular, there are intensive studies on increasing of the concentration of hydrogen adsorbed at low temperatures in order to determine the limiting value for which maintaining the reservoir at the temperature of liquid hydrogen would be economically viable. It seems that the limiting concentration is being currently reached. The second direction of research is to increase the limiting value of temperature at which the concentration of adsorbed hydrogen is acceptable.
Źródło:
Wiadomości Chemiczne; 2012, 66, 3-4; 227-247
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of soil quality after biochar application based on enzymatic activity and microbial composition
Autorzy:
Mierzwa-Hersztek, M.
Gondek, K.
Klimkowicz-Pawlas, A.
Chmiel, M.J.
Dziedzic, K.
Taras, H.
Powiązania:
https://bibliotekanauki.pl/articles/2082557.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
biochar
soil
enzymatic activity
microorganisms
soil quality indexes
Opis:
Soil microorganisms play a key role in many biochemical processes essential for the environment and for the ecological and production functions of soils, hence they are very important quality indicators. The study aimed at evaluating the effect of 1 and 2% additions of wheat and miscanthus straw biochars on soil enzymatic activity (dehydrogenases, urease, phosphatases) and the number of microorganisms (bacteria, fungi, actinobacteria). Pot experiments were carried out on soil with a loamy sand texture. The geometric mean of enzyme activities, biological index of fertility, and the integrated total enzyme activity index were used to explore the relationships between soil enzyme activities and the microbiological and chemical properties of soil. The addition of 1% miscanthus straw biochar had the most beneficial effect on the number of bacteria and fungi (increase by 380 and 26%, respectively), and 1% wheat straw biochar on the number of actinomycetes (increase by 273%). The correlation analysis between the number of actinomycetes and the chemical parameters of the soil showed the significant effect of the content of Ntotal (r = 0.76) and Ctotal (r = 0.85). The values of biological index of fertility, total enzyme activity index and geometric mean of enzyme activities indexes showed that the best quality of soil was produced by a 2% addition of wheat straw biochar.
Źródło:
International Agrophysics; 2019, 33, 3; 331-336
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FT-IR analysis and the content of phenolic compounds in exogenous organic matter produced from plant biomass
Autorzy:
Mierzwa-Hersztek, M.
Gondek, K.
Nawrocka, A.
Pinkowska, H.
Bajda, T.
Stanek-Tarkowska, J.
Szostek, M.
Powiązania:
https://bibliotekanauki.pl/articles/15427.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Źródło:
Journal of Elementology; 2019, 24, 3
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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