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Tytuł:
Kryteria psychofizycznego przygotowania grup zadaniowych do skutecznych działań obronnych i ofensywnych
Autorzy:
Kalina, Roman M.
Klukowski, Krzysztof.
Powiązania:
W: Wojsko w badaniach socjologicznych / pod red. nauk. Tadeusza Leczykiewicza, Zdzisława Zagórskiego Wrocław : WSO, 1998 Wydanie specjalne, S. 309-315, Zeszyty Naukowe : Wyższa Szkoła Oficerska im. Tadeusza Kościuszki
Współwytwórcy:
Leczykiewicz, Tadeusz. Redakcja
Zagórski, Zdzisław (1946- ). Redakcja
Data publikacji:
3093
Tematy:
Socjologia wojskowa materiały konferencyjne.
Opis:
Materiały konferencji naukowej "Wojsko w badaniach socjologicznych". Wrocław, 27-28.05.1998.
Dostawca treści:
Bibliografia CBW
Artykuł
Tytuł:
Centrum Zaawansowanej Analityki Danych (CZAD JSW 4.0) - koncepcja organizacyjno-techniczna, rola i znaczenie w realizacji idei INTELIGENTNEJ KOPALNI JSW 4.0
Autorzy:
Dyczko, Artur
Kotwica, Krzysztof
Krawczyk, Artur
Powiązania:
https://bibliotekanauki.pl/chapters/24200442.pdf
Data publikacji:
2023
Wydawca:
Instytut Techniki Górniczej KOMAG
Tematy:
CZAD JSW 4.0
Inteligentna Kopalnia JSW 4.0
automatyzacja i monitorowanie procesu produkcyjnego
IoT
M2M
techniki cyfrowe
analiza wielowymiarowa AKPiA
Źródło:
Automatyzacja i monitorowanie procesu produkcyjnego w kopalniach podziemnych – polskie doświadczenia we wdrażaniu paradygmatu PRZEMYSŁU 4.0; 47-134
9788365593306
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of dynamic parameters of a tram wheel parts in a numerical and experimental modal analysis
Autorzy:
Milewicz, Julia
Kołodziejczak, Krzysztof
Nowakowski, Tomasz
Szymański, Grzegorz M.
Powiązania:
https://bibliotekanauki.pl/articles/27311809.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
rail vehicles
modal analysis
simulation
modes extraction
pojazdy szynowe
analiza modalna
symulacja
ekstrakcja trybów
Opis:
The analysis of dynamic parameters finds effective application in processes related to the assessment of the technical condition of machines. Mass transport vehicles are particularly sensitive to maintaining an appropriate level of traffic safety through relevant design and diagnostics. The combination of numerical and experimental methods increases the efficiency of modal properties investigations, which can be used as diagnostic parameters. During the research, the authors performed a numerical model of a system composed of a rim and an inner disc of a wheel fitted in a Konstal 105Na tram, widely used in many polish cities and frequently subjected to repair and renovation processes. The Time Response analysis in SOLIDWORKS (also called Modal Time History) was then conducted, resulting in obtaining information about object vibration response in time domain to the impulsive excitation at given points. These signals were then processed in MATLAB aiming at determining the frequencies of natural vibration and damping ratios. The processing parameters in MATLAB were corresponding to the analysis settings of the experimental measurement, carried out within the BK Connect environment, with an impact modal hammer and piezoelectric transducers. When analyzing the experimental measurements, the authors applied Fast Fourier Transformation, Frequency Response Function and Complex Mode Indicator Function (the theoretical basis of which and practical sense of application were also presented in the paper). Finally, the results of the experiment were compared with simulation outcomes. This comparison allowed the obtainment of frequency characteristics of the vibration response to the impact and the determination of the dynamic parameters of the actual object. Six frequencies of natural vibrations were determined in the frequency range of 0 to 3000 Hz, as well as their damping ratios and autocorrelation indicators between modes. Similarities and potential sources of differences between the numerical and the experimental results were identified and explained, followed by conclusions on the practical application of the presented research methodology in the industry.
Źródło:
Archives of Transport; 2023, 67, 3; 119--137
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Functioning of the Family System With an Autistic Child: A Comparative Study Between Poland and California, USA
Autorzy:
Gerc, Krzysztof
Novak, Jean M.
Furman, Marta
Powiązania:
https://bibliotekanauki.pl/articles/44451047.pdf
Data publikacji:
2023
Wydawca:
Akademia Ignatianum w Krakowie
Tematy:
ASD
flexibility and communication in the family system
educational relationships
family-educational institutional relationships
Opis:
Objectives of the research: The aims of this research are to conduct a comparison study between the level of communication and flexibility in families with autistic children in two different geographical locations and cultural contexts – California (USA) and Poland (Europe) – to address whether the level of these two dimensions of family functioning are related to the ego-resiliency of the parents, and additionally to discuss the practical implications that can be drawn from the results. Research methods: Communication and flexibility profiles in family functioning were collected in Poland and California from September 2016 to February 2018. Data on the similarities and differences between parents of children with autism spectrum disorder in Poland (n=111) and California (n=105) was collected using Olson’s FACES-IV. The Ego-Resiliency Scale was also administered in methodologically standardized conditions and was empirically analyzed along with controlled demographic variables. A short description of the context of the issue: Family functioning and ego-resiliency in families with children with autism are analyzed in this research. The richness of interactions and connections within the family system suggests that when explaining the relationships within the family system, the interpretation that is based on linear causality is abandoned and replaced by circular causality, which is the model of analysis utilized in this research project. The main goals of this research were to compare and contrast family functioning in two geographical locations and cultural contexts and to show statistically significant differences between these two groups, in order to better understand cultural variations and differences that may affect family functioning and ego-resiliency and to provide the different groups with adequate, necessary support services. Research findings: The results revealed statistically significant differences in various dimensions of Family Communication and Flexibility between families of autistic children in California and Poland. With respect to both variables, higher scores were found in the California group. The flexibility results in both groups were defined as flexible. However, in regards to family communication, the result of the California group corresponded to higher standardized scores, whereas those of the group from Poland revealed moderate standardized scores. Conclusions and recommendations: Statistically significant positive correlations were found in the variables of Flexibility and Family Communication between Poland and California. The results of this research are critical, not only from the perspective of scientific development (as similar studies have not been conducted), but also for therapeutic and preventive reasons. They suggest concentrating on preventive activities and aspects that are important for the well-being of the parent as a person, as well as the entire family system, especially the dimensions of communication in families with children with autism spectrum disorder and the ego-resiliency of the parents. However, further research is needed to specifically identify the differences between the groups based on various demographic variables. Additionally, it is important to develop a practical model to support families with autistic children and to address family satisfaction in intervention strategies, as well as to consider the importance of support groups that may improve satisfaction and ego-resiliency within the family system.
Źródło:
Multidisciplinary Journal of School Education; 2023, 12, 2 (24); 321-355
2543-7585
Pojawia się w:
Multidisciplinary Journal of School Education
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hector M. Patmore – Josef Lössl (eds.), Demons in Early Judaism and Christianity . Characters and Characteristics (Ancient Judaism and Early Christianity 113; Leiden – Boston, MA: Brill 2022)
Autorzy:
Kinowski, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/20679064.pdf
Data publikacji:
2023-01-27
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II
Źródło:
The Biblical Annals; 2023, 13, 1; 197-200
2083-2222
2451-2168
Pojawia się w:
The Biblical Annals
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Charge Materials on the Metallurgical Quality of Gray Cast Iron
Autorzy:
Dwulat, Rafał
Janerka, Krzysztof
Grzesiak, K.
Gałuszka, M.
Powiązania:
https://bibliotekanauki.pl/articles/27314156.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
gray cast iron
thermal analysis
cast iron properties
charge materials
cast iron inoculation
żeliwo szare
analiza termiczna
właściwości żeliwa
Opis:
The article presents the influence of the percentage share of pig iron and steel scrap on the chemical composition, physicochemical and mechanical properties. Using an induction furnace, 6 melts were carried out with a variable amount of pig iron in the charge from 0 to 50%. For carburizing, a RANCO 9905 carburizer with a carbon content of 99.2% was used. After melting and introducing FeSi75, temperature measurement was carried out and the metal was superheated to 1500°C. The next step was to pour the samples for chemical analysis, DTA (Derivation Thermal Analysis) and strength and hardness from the melting furnace without inoculation. The last step was to carry out the inoculation by introducing 0.3% barium inoculant into the vat and pouring samplers for DTA analysis. The inoculation was carried out solely to determine changes in DTA parameters, mainly Temin, compared to castings without inoculation.
Źródło:
Archives of Foundry Engineering; 2023, 23, 2; 66--71
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Informacja pozorna i fałszywa w jakościowej teorii informacji. Analiza z punktu widzenia cybernetyki
Autorzy:
Kiełpiński, Krzysztof M.
Powiązania:
https://bibliotekanauki.pl/articles/13947651.pdf
Data publikacji:
2023-02-20
Wydawca:
Akademia Sztuki Wojennej
Tematy:
information
apparent information
false information
qualitative theory
simulation
dissimulation
confusing nature of information
Opis:
Information is the basic tool of inter vivos communication. It serves as a carrier for many data. Thanks to it, many areas of human life can function. Cybernetic scientists have recognized that mankind has difficulty defining and defining „information”. Marian Mazur undertook the task of creating the definition. His research laid the groundwork for a qualitative information theory. Its task was to define the information and carry out the analysis and synthesis of this important reality. Moreover, it showed the differences between doctrine and science. Information science and its theory and quality have shown that scientists want their views to fit with reality. Doctrinaires need reality to match their views. The task of a scientist is to search for truth, therefore he is worried about the difficulties of finding it. The doctrinaire knows the truth from the beginning and enjoys its completeness. Moving on, the scientist has a lot of doubts that what the science says is true, while the representative of the doctrine has no doubt that what the doctrine says is true. After all, the scientist thinks what science says is impermanent, so the doctrine says what the doctrine says lasts forever. The above study showed what information is and what the science of information looks like, moreover, its basic dimension was presented, indicating its operational and essential character. A very valuable description is the analysis of various areas of human life, in which there are various types of information, among them false and false. Pseudoinformation and disinformation occur very often, therefore the next thought expressed in the article was the characteristics and their practical application.
Źródło:
Cybersecurity and Law; 2023, 9, 1; 127-143
2658-1493
Pojawia się w:
Cybersecurity and Law
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solar chargers based on new dye-based photovoltaic modules and new supercapacitors
Autorzy:
Plebankiewicz, Ireneusz
Bogdanowicz, Krzysztof. A.
Kwaśnicki, Paweł
Skunik-Nuckowska, Magdalena
Rączka, Patryk M.
Kulesza, Paweł
Iwan, Agnieszka
Przybył, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/27311422.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
dye-sensitized solar cell
supercapacitor
redox-active electrolyte
current source
energy storage system
Artificial Intelligence
superkondensator
elektrolit o działaniu redoks
system magazynowania energii
sztuczna inteligencja
barwnikowe ogniwo słoneczne
aktywne źródło
Opis:
Electricity storage is one of the best-known methods of balancing the energy supply and demand at a given moment. The article presents an innovative solution for the construction of an electric energy storage device obtained from an innovative photovoltaic panel made of new dye-based photovoltaic modules and newly developed supercapacitors – which can be used as an emergency power source. In the paper, for the first time, we focused on the successful paring of new dye-sensitized solar cell (DSSC) with novel supercapacitors. In the first step, a microprocessor stand was constructed using Artificial Intelligence algorithms to control the parameters of the environment, as well as the solar charger composed of six DSSC cells with the dimensions of 100_100 mm and 126 CR2032 coin cells with a total capacitance of 60 F containing redox-active aqueous electrolyte. It was proven that the solar charger store enough energy to power, i.e. SOS transmitter or igniters, using a 5 V signal.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 4; art. no. e146452
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Successive Stages of the Melting Process on the Nucleation of Ductile Cast Iron
Autorzy:
Kołakowski, Jakub
Brzeżański, Mateusz
Burdzy, Daniel
Sobieraj, J.
Urbanowicz, M.
Paruch, T.
Janerka, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/27314118.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
grey cast iron
ductile cast iron
inoculation
DTA
eutectic temperature
nucleation
żeliwo szare
żeliwo sferoidalne
inokulacja
temperatura eutektyczna
ziarna
Opis:
The article discusses issues related to the melting of grey and ductile cast iron in terms of metallurgical quality. The derivative and thermal analysis (DTA) was used to assess this quality. The article presents the results of research carried out in industrial conditions and analysed by the Itaca system. In the paper, the effect of the furnace type, the charge materials and the inoculation process on the parameters characterising the cast iron being melted was analysed. The most important of these are the minimum eutectic temperature (Temin), the liquidus temperature (Tliquidus) and the nucleation rate. The results of the research and calculations are shown in graphs and as dependencies. Some of DTA results were compared to the microstructure analysis results. The article shows that the derivative and thermal analysis is a very effective tool in the assessment of the metallurgical quality of cast iron. It is a very good addition to chemical analysis. Based on the results of the research, it was concluded that a very high correlation exists between the rate of nucleation (DTA) and the number of graphite nuclei (microstructure analysis). Furthermore, it was also found that an improvement in nucleation could be achieved by ensuring a high value of carbon equivalent (CE) and, above all, by conducting the primary and secondary inoculation processes, respectively.
Źródło:
Archives of Foundry Engineering; 2023, 23, 1; 61--67
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The growth and characterisation of type I GaSb/AlSb superlattice with a thin GaSb layer
Autorzy:
Fokt, Maciej
Jasik, Agata
Sankowska, Iwona
Mączko, Herbert S.
Paradowska, Karolina M.
Czuba, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/27315692.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
type I AlSb/GaSb superlattice
8-band k·p perturbation theory
nextnano simulations
AlSb layer degradation
Opis:
This paper presents results of the characterisation of type I GaSb/AlSb superlattices (SLs) with a thin GaSb layer and varying thicknesses of an AlSb layer. Nextnano software was utilized to obtain spectral dependence of absorption and energy band structure. A superlattice (SL) with an energy bandgap of ~ 1.0 eV and reduced mismatch value was selected for experimental investigation. SLs with single (sample A) and double (sample B) AlSb barriers and a single AlSb layer (sample C) were fabricated using molecular beam epitaxy (MBE). Optical microscopy, high-resolution X-ray diffractometry, and photoluminescence were utilized for structural and optical characterisation. The presence of satellite and interference peaks in diffraction curves confirms the high crystal quality of superlattices. Photoluminescence signal associated with the superlattice was observed only for sample B and contained three low-intensity peaks: 1.03, 1.18, and 1.25 eV. The first peak was identified as the value of the energy bandgap of the SL. Other two peaks are related to optical transitions between defect states located at the interface between the SL and the top AlSb barrier. The time-dependent changes observed in the spectral characteristics are due to a modification of the SL/AlSb interface caused by the oxidation and hydroxylation of the AlSb layer.
Źródło:
Opto-Electronics Review; 2023, 31, 4; art. no. e147912
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physicochemical and Sensory Properties with Special Emphasis on Thermal Characteristics of Whey Butter from Gouda Cheese Production Compared to Milk Butter
Autorzy:
Brożek, Oskar M.
Kiełczewska, Katarzyna
Bohdziewicz, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2152158.pdf
Data publikacji:
2022-11-14
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
whey butter
milk butter
differential scanning calorimetry
fatty acid profile
sensory attributes
Opis:
The aim of this study was to characterise milk fat from whey butter and to identify potential differences between whey butter (WB) and sweet cream butter (milk butter – MB). The fatty acid (FA) profile, thermal properties, colour parameters, texture properties, and sensory attributes of MB and WB were compared. The values of texture properties (firmness, brittleness, and cohesiveness) and colour parameters (values of b* and the yellowness index) of WB were lower than MB. The sensory analysis showed lower values of consistency descriptors (firmness, brittleness, cohesiveness), a less intense nutty and milky aroma, and a more intense cheesy aroma and taste in WB than in MB. WB was more abundant in monounsaturated, polyunsaturated, and long-chain FAs, including C18:0, C18:1 Σt, C18:1 Σc, C18:2, C18:3, and C18:2 c9, t11, and it was less abundant in saturated and medium-chain FAs, including C10:0, C12:0, C14:0, C14:1, C15:0, C16:0, and C16:1, relative to MB. Water content (MB vs WB and the corresponding fats) and thermal history (single vs repeated heating and cooling treatments) affected differential scanning calorimetry curves and phase transition peaks. The principal component analysis revealed that the FA profile influenced the crystallisation and melting peaks of MB fat (MBF) and WB fat (WBF). WBF crystallisation occurred at a lower temperature, was characterised by lower enthalpy, and proceeded more rapidly than MBF crystallisation. Various fat fractions had different melting characteristics, and most WBF fractions were characterised by lower melting enthalpy and a smaller maximum difference in heat flow than MBF. Whey butter and milk butter differed in physicochemical properties and sensory attributes, and their thermal profiles depended on the FA profile, water content, and thermal history.
Źródło:
Polish Journal of Food and Nutrition Sciences; 2022, 72, 4; 407-419
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Speeding Up Minimum Distance Randomness Tests
Autorzy:
Mańk, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2142303.pdf
Data publikacji:
2022
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
Bickel-Breiman test
minimum distance test
m nearest pairs test
randomness test
Opis:
Randomness testing is one of the essential and easiest tools for the evaluation of the features and quality of cryptographic primitives. The faster we can test, the greater volumes of data can be checked and evaluated and, hence, more detailed analyses may be conducted. This paper presents a method that significantly reduces the number of distances calculated in the minimum distance, Bickel-Breiman, and m nearest points tests. By introducing a probabilistic approach with an arbitrarily low probability of failure, the number of calculated distances proportional to the number of required distances and independent of the number of points was achieved. In the well-known Diehard’s minimum distance and 3D spheres tests, the quantity of computations achieved is reduced by the factors of 394 and 771, respectively.
Źródło:
Journal of Telecommunications and Information Technology; 2022, 2; 99--109
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bóg i Auschwitz. O Edycie Stein, wizycie Papieża Benedykta XVI i Bogu w mrokach dziejów. Red. M. Deselaers, L. Łysien, J. Nowak
Autorzy:
Kaucha, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2143815.pdf
Data publikacji:
2021-01-30
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
Źródło:
Roczniki Teologii Fundamentalnej i Religiologii; 2009, 1; 189-192
2080-8534
Pojawia się w:
Roczniki Teologii Fundamentalnej i Religiologii
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Can Normative Economics Be Convincing without the Notion of Well-Being?
Autorzy:
Kwarciński, Tomasz
Turek, Krzysztof M.
Powiązania:
https://bibliotekanauki.pl/articles/2136017.pdf
Data publikacji:
2021-10-31
Wydawca:
Uniwersytet Warszawski. Wydział Filozofii
Tematy:
well-being
welfare
opportunity
capability
normative economics
positive economics
Opis:
In this article, we examine the notion of well-being in light of the relationship between positive and normative economics. Having identified four interrelationships between possible theoretical developments within the two fields, we propose a framework for the analysis of normative economic theories. The starting point for these considerations were competing stances on well-being proposed by neoclassical welfare economics, Robert Sugden, Amartya Sen, and Daniel Hausman.
Źródło:
Filozofia Nauki; 2021, 29, 3; 37-61
1230-6894
2657-5868
Pojawia się w:
Filozofia Nauki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic elastic properties of the hard coal seam at a depth of around 1260 m
Dynamiczne sprężyste właściwości pokładu węgla na głębokości około 1260 m
Autorzy:
Krawiec, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/1849546.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
dynamic elastic parameters
coal seam
P-wave velocity
S-wave velocity
seismic profiling
dynamiczne parametry sprężyste
pokład węgla
prędkość fali P
prędkość fali S
profilowanie sejsmiczne
Opis:
The knowledge of the dynamic elastic properties of a coal seam is important in the context of various types of calculations of the seam behavior under various stress-strain conditions. These properties are often used in numerical and analytical modeling related to maintaining the stability of excavations and the analysis of mechanisms, e.g. related to the risk of rock bursts. Additionally, during the implementation of seismic surveys, e.g. seismic profiling and seismic tomography in coal seams, the reference values of the elastic properties of coal are used in the calculation of relative stresses in various geological and mining conditions. The study aims to calculate the dynamic elastic parameters of the coal seam located at a depth of 1,260 m in one of the hard coal mines in the Upper Silesian Coal Basin (USCB). Basic measurements of the velocity of P- and S-waves were conducted using the seismic profiling method. These surveys are unique due to the lack of the velocity wave values in the coal seam at such a great depth in the USBC and difficult measurement conditions in a coal mine. As a result, dynamic modulus of elasticity was calculated, such as Young’s modulus, volumetric strain modulus, shear modulus and Poisson’s ratio. The volumetric density of coal used for calculations was determined on the basis of laboratory tests on samples taken in the area of the study. The research results showed that the calculated mean P-wave velocity of 2,356 m/s for the depth of 1,260 m is approximately consistent with the empirical relationship obtained by an earlier study. The P-wave velocity can be taken as the reference velocity at a depth of approx. 1,260 m in the calculation of the seismic anomaly in the seismic profiling method.
Znajomość dynamicznych właściwości sprężystych pokładu węgla jest istotna w kontekście różnego rodzaju obliczeń zachowania się pokładu w różnorakich warunkach naprężeniowo-odkształceniowych. Właściwości te są często wykorzystywane w modelowaniach numerycznych i analitycznych związanych z utrzymaniem stateczności wyrobisk oraz analizą mechanizmów, np. związanych z zagrożeniem tąpaniami. Dodatkowo w trakcie realizacji badań sejsmicznych np. profilowań sejsmicznych i tomografii sejsmicznej w pokładach węgla referencyjne wartości właściwości sprężyste węgla wykorzystywane są w obliczaniach naprężeń względnych w różnych warunkach geologiczno-górniczych. Celem badań jest obliczenie dynamicznych sprężystych parametrów pokładu węgla, położonego na głębokości około 1260 m, w jednej z kopalń węgla kamiennego w Górnośląskim Zagłębiu Węglowym. Podstawowe pomiary prędkości fal sejsmicznych wykonano metodą profilowania sejsmicznego. Te pomiary są unikatowe ze względu na dużą głębokość położenia profilu pomiarowego oraz trudne warunki pomiarowe w kopalni. W efekcie obliczono dynamiczne moduły sprężystości takie jak: moduł Younga, moduł odkształcenia objętościowego, moduł odkształcenia postaciowego oraz współczynnik Poissona. Gęstość objętościową węgla przyjętą do obliczeń wyznaczono na podstawie testów laboratoryjnych na próbach pobranych w rejonie badań. Wyniki badań pokazały, że obliczona średnia prędkość fali P równa 2356 m/s dla głębokości 1260 m jest w przybliżeniu zgodna z empirycznymi zależnościami określonymi we wcześniejszych badaniach. Prędkość fali P może być przyjęta jako prędkość odniesienia na głębokości około 1260 m w obliczeniach anomalii sejsmicznej w metodzie profilowania sejsmicznego.
Źródło:
Gospodarka Surowcami Mineralnymi; 2021, 37, 3; 159-176
0860-0953
Pojawia się w:
Gospodarka Surowcami Mineralnymi
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 334

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