Nauki Techniczne

Archives of Mining Sciences

Zawartość

Archives of Mining Sciences | 2025 | vol. 70 | No 4

Abstrakt

This study employed machine learning techniques to predict time series of diffusion curves, generated in Python with NumPy library. The data was structured as a time series to enable efficient model training and evaluation. Various approaches – statistical, neural, and regression-based – were tested to model the diffusion dynamics. Results revealed notable performance differences: regression models achieved the highest accuracy with the lowest error rates, while time series models like ARIMA and TCN performed worse, likely due to difficulties in capturing the process’s complexity.
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Autorzy i Afiliacje

Mateusz Zaręba
1
ORCID: ORCID
Marta Skiba
2
ORCID: ORCID

  1. AGH University of Krakow, Faculty of Geology, Geophysics and Environmental Protection, al. Mickiewicza 30, 30-059 Krakow, Poland
  2. Strata Mechanics Research Institute of the Polish Academy of Sciences, Reymonta 27, 30-059 Krakow, Poland

Abstrakt

The article presents a comprehensive analysis of hydrogen accumulation properties on various carbon and coal structures, including carbon nanotubes of different diameters, reduced graphene oxide, activated carbon, and two types of hard coal. The study involved porous structure characterization using volumetric and microscopic techniques, measurements of hydrogen adsorption isotherms using the Sieverts apparatus and determination of the isosteric heat of adsorption. The highest adsorption capacities in relation to hydrogen were observed at low temperatures and low pressures, confirming that physisorption is the dominant adsorption mechanism in the investigated materials. Activated carbon and carbon nanotubes exhibited the highest adsorption capacities – up to 11.4 mmol/g and 3.3 mmol/g, respectively – demonstrating their potential for low-temperature hydrogen storage applications. In contrast, hard coals showed lower capacities, ranging from 0.9 mmol/g to 1.54 mmol/g. The isosteric heat of adsorption (Qst) at the initial stages of adsorption varied between 6.5 kJ/mol and 13.2 kJ/mol, decreasing exponentially as surface coverage progressed. The greatest differences in heat distribution were observed in materials with strongly heterogeneous surface characteristics. For the coal samples, Qst values ranged from 8.4 to 9.1 kJ/mol.
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Autorzy i Afiliacje

Anna Pajdak
1
ORCID: ORCID
Adam Dębski
2
ORCID: ORCID
Mateusz Kudasik
ORCID: ORCID
Norbert Skoczylas
3
ORCID: ORCID
Wojciech Maziarz
2
ORCID: ORCID
Władysław Gąsior
2
ORCID: ORCID

  1. Strata Mechanics Research Institute, Polish Academy of Sciences, 27 Reymonta Str., 30-059 Kraków, Poland
  2. Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta Syt., 30-059 Kraków, Poland
  3. AGH University of Science and Technology, Faculty of Geology, Geophysics and Environmental Protection, Al. Mickiewicza 30, 30-059 Kraków, Poland

Abstrakt

The Książ Geodynamic Laboratory is a unique research centre, both nationally and globally, conducting a comprehensive research program in the field of Earth sciences. It primarily focuses on studying tidal and non-tidal phenomena using water-tube tiltmeters. Over the past decade, the Laboratory has developed a research program aimed at predicting seismic events (strong seismic shocks with a magnitude of ≥3.6 of natural origin) by analyzing changes in stress conditions within the orogen. The modification of the water-tube tiltmeter recording system proposed in this article will significantly enhance the quality of ongoing research. First and foremost, modernisation of the water-tube tiltmeter detector will increase the instrument’s sensitivity by two orders of magnitude, enabling the measurement of water level changes at the picometer scale. Equally important, the upgrade will allow real-time data acquisition. This feature is critical for the practical application of observations, as real-time results can be used to forecast the risk of strong seismic shocks in two key Polish mining regions: the Upper Silesian Coal Basin and the Legnica- Głogów Copper District. Previous studies based on archival data (2013-2017) have confirmed the high effectiveness of this forecasting procedure (>95%). The insights gained will undoubtedly contribute significantly to mitigating seismic hazards in underground mines.
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Autorzy i Afiliacje

Damian Kasza
1
ORCID: ORCID
Marek Kaczorowski
2
ORCID: ORCID
Ryszard Zdunek
2
ORCID: ORCID
Roman Wronowski
2
ORCID: ORCID

  1. Wrocław University of Science and TECHNOLOGY, Faculty of Geoengineering, Mining and Geology, 15 Na Grobli Str., 50-421 Wrocław Poland
  2. Space Research Center, Polish Academy of Sciences, 18 A Bartycka Str., 00-716 Warszawa, Poland

Abstrakt

Mechanized excavation is a method based on cutting and breaking the rock using machines designed with cutting heads suitable for the formation. Mechanized excavation can be considered the only economic excavation method that can be an alternative to the drilling and blasting method. In this study, the excavatability of 11 different coal surrounding rocks from the Zonguldak Basin was determined using two different methods. The excavatability of the region has been evaluated for the first time in this scope. To determine excavatability, uniaxial compressive strength (UCS), deformability test, and Bond work index (Bwi) tests were conducted in the laboratory. In the evaluation using the test results, significant relationships were obtained for the excavatability of the region. A significant positive correlation (R2 = 0.84) was found between uniaxial compressive strength and the Bond work index. Additionally, a high exponential relationship (R2 = 0.86) was obtained between the specific energy values calculated using the SE formula and the Bond work index values. These results demonstrate that the Bond work index can be effectively used as an alternative method for evaluating excavatability in coal surrounding rocks.
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Autorzy i Afiliacje

Çağrı Aldi
1
ORCID: ORCID
Olgay Yarali
2
ORCID: ORCID

  1. Zonguldak Bulent Ecevit University, Department of Mi ning and Mineral Extraction, Caycuma Vocatio nal Schoo l, Zonguldak, Türkiye
  2. Zonguldak Bulent Ecevit University, Faculty of Engineering, Department of Mining Engineering, Zonguldak, Türkiye

Abstrakt

Methane, the primary component of coalbed methane (CBM), plays a crucial role in reducing greenhouse gas emissions and mitigating coal mine safety risks. However, the efficient extraction of CBM is hindered by the complexity of coal seam pore structure (CSPS). This study investigates the impact of pore structure on methane gas expansion energy recovery using an intelligent operation coal mine in Province G, China, as a case study. Fractal theory was employed to analyse coal seam pore structure, and experimental results revealed that the microporous pore volume percentage in coal samples from two mines exceeded 85%, with a mean microporous specific surface area (SSA) percentage of 98.20% and 95.75%, respectively. A direct correlation was observed between increasing SSA and enhanced methane adsorption capacity. Additionally, a positive relationship was found between coal sample fractal dimension (FD) and methane adsorption, indicating that a more intricate pore structure enhances methane retention.
The findings suggest that optimising coal seam pore structure can significantly improve methane recovery efficiency, thereby reducing the risk of coal mine accidents and enhancing safety measures. By elucidating the role of CSPS in methane recovery, this study provides a scientific foundation for improving gas expansion energy recovery, particularly for methane extraction.
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Autorzy i Afiliacje

Baolin Li
1
ORCID: ORCID
Jie Song
1
ORCID: ORCID
Wenbo Guan
2
ORCID: ORCID
Zhankai Wu
3
ORCID: ORCID
Zengrong Zheng
4
ORCID: ORCID

  1. Zhejiang University of Water Resources and Electric Power, College of Civil Engineering and Architecture, Hangzhou 310000, China
  2. Chongqing Research Institute, China Coal Technology Engineering Group, Chongqing 400037, China
  3. Hangzhou Ruhr Technology Ltd, Hangzhou 310000, China
  4. Di-Matrix (Shanghai) Information Technology Co., Ltd, ShangHai, 200000, China

Abstrakt

The disturbance of vibration wave will have a great influence on the internal stress, pore fissure and gas adsorption of coal and rock mass. The typical earthquake and mine earthquake waveform records in the mining area are selected. Combined with the comprehensive histogram of the working face, the calculation model is established by UDEC software, and the propagation attenuation law of vibration wave in the presence or absence of chamber is analyzed. The calculation results show that: (1) Under the condition of no chamber, the peak velocity of seismic wave decreases exponentially with the increase of source distance, and the fitting accuracy R2 of seismic wave and mine seismic wave attenuation characteristics is 0.96 and 0.98 respectively. (2) The peak velocity of seismic wave decreases exponentially with the increase of focal distance under the condition of chamber. However, there is a transition point at the chamber (goaf), which attenuates at a faster speed before passing through the chamber, and the attenuation speed slows down after passing through the chamber. The attenuation rate of the peak velocity of the earthquake and the mine earthquake reached 53.9% and 46.8% respectively when passing through the chamber. (3) The peak velocity of the vibration wave is the largest at the left/right foot of the chamber, and the peak velocity of the vault is the smallest. (4) The velocity attenuation curve of the source ring of the seismic wave decreases faster in the vertical direction than in the horizontal direction, and the attenuation in the vertical direction is particularly obvious after passing through the chamber. The propagation and attenuation characteristics of vibration waves are of great significance to the prevention and control of rock burst in coal mines, the development characteristics of coal and rock pores and fractures, and the early warning of gas disasters.
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Autorzy i Afiliacje

Hailong Mu
1
ORCID: ORCID
Shengjun Zhang
2

  1. Ningxia Transportation Science Research Institute Co., Ltd; Institute of Engineering Mechanics, China Earthquake Administration, China
  2. Ningxia Academy of Agriculture and Forestry Sciences, China

Abstrakt

This study aims to examine the occupational traumas experienced by occupational safety specialists following fatal, limb-loss, and serious injury-related workplace accidents, as well as the impact on their safety perceptions and the preventive strategies they develop. This research was conducted using a phenomenological approach, which is a type of qualitative research design. In-depth semi-structured interviews were carried out with 14 occupational safety experts working in various regions of Turkey. Criterion sampling was used to select participants. The data obtained were systematically analysed using thematic analysis. Interviews continued until data saturation was reached, and recurring patterns were observed. The research process and the reporting of findings were structured in accordance with the COREQ checklist. The study identified three main themes: occupational trauma, altered risk perception, and new safety strategies. These reflect specialistic psychological and professional changes following workplace accidents. The study offers insights into how occupational safety specialists adapt their policies and improve safety culture after serious accidents. It emphasises changes in precautionary approaches and their role in fostering safer workplaces. Key policy and cultural enhancement recommendations are also proposed.
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Autorzy i Afiliacje

Onur Doğan
1
ORCID: ORCID

  1. Gümüşhane Üniversitesi, Türkiye

Abstrakt

This study investigates the structural and sorption properties of coal maceral groups from Poland. Seven fractions with varying maceral compositions were obtained by gravity separation, and their maceral proportions were determined using an automated classification method based on artificial neural networks. The samples were analyzed by microscopy, low-pressure gas adsorption, and methane adsorption and diffusion measurements. Results showed that a higher vitrinite content was associated with greater CH4 adsorption capacity, while inertinite-rich fractions exhibited lower values. The estimated adsorption capacity of pure vitrinite reached 14.3 cm3/g at 1.5 MPa, nearly double that of pure inertinite (6.78 cm3/g). Diffusion analysis revealed that fractions with lower vitrinite content demonstrated significantly higher diffusion coefficients, highlighting the key role of maceral composition in methane storage and transport in coal.
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Autorzy i Afiliacje

Marta Skiba
1
ORCID: ORCID
Mateusz Kudasik
1
ORCID: ORCID
Paweł Baran
1
ORCID: ORCID
Anna Pajdak
1
ORCID: ORCID

  1. Strata Mechanics Research Institute of the Polish Academy of Sciences, 27 Reymonta Str., 30-059 Kraków, Poland

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Archives of Mining Sciences (AMS) is concerned with original research, new developments and case studies in all fields of mining sciences which include:

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[1] L.B. Magalas, Development of High-Resolution Mechanical Spectroscopy, HRMS: Status and Perspectives. HRMS Coupled with a Laser Dilatometer . Arch. Metall. Mater. 60 (3), 2069-2076 (2015). DOI: https://doi.org/10.1515/AMM-2015-0350

[2] E. Pagounis, M.J. Szczerba, R. Chulist, M. Laufenberg, Large Magnetic Field-Induced Work output in a NiMgGa Seven-Lavered Modulated Martensite. Appl. Phys. Lett. 107, 152407 (2015). DOI: https://doi.org/10.1063/1.4933303

[3] H. Etschmaier, H. Torwesten, H. Eder, P. Hadley, Suppression of Interdiffusion in Copper/Tin thin Films. J. Mater. Eng. Perform. (2012). DOI: https://doi.org/10.1007/s11665-011-0090-2.

Books:

[4] K.U. Kainer (Ed.), Metal Matrix Composites, Wiley-VCH, Weinheim (2006).

[5] K. Szacilowski, Infochemistry: Information Processing at the Nanoscale, Wiley (2012).

[6] L. Reimer, H. Kohl, Transmission Electron Microscopy: Physics of Image Formation, Springer, New York (2008).

Proceedings or chapter in books with editor(s):

[7] R. Major, P. Lacki, R. Kustosz, J. M. Lackner, Modelling of nanoindentation to simulate thin layer behavior, in: K. J. Kurzydłowski, B. Major, P. Zięba (Eds.), Foundation of Materials Design 2006, Research Signpost (2006).

Internet resource:

[8] https://www.nist.gov/programs-projects/crystallographic-databases, accessed: 17.04.2017

Academic thesis (PhD, MSc):

[9] T. Mitra, PhD thesis, Modeling of Burden Distribution in the Blast Furnace, Abo Akademi University, Turku/Abo, Finland (2016).


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