The Impact of Cutting with a Shearer on the Conditions of Longwall Ventilation
Energies, 2021 In coal mines that are exploiting methane-saturated seams, high-level emission of methane is often the basic limitation for modern and high-efficiency longwall complexes.
Wacław Dziurzyński +3 more
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New Instruments and Methods for Analysing the Coal-Methane System
Studia Geotechnica et Mechanica, 2015 The authors of the present paper designed and constructed a prototype of an instrument which enables fully automated determination of the desorbable methane content and effective diffusion coefficient in underground conditions.
Skoczylas Norbert +3 more
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Ekedahl–Oort strata and Kottwitz–Rapoport strata
Journal of Algebra, 2012 10 ...
Görtz, Ulrich, Hoeve, Marteen
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Metastable energy strata in numerical discretizations of weakly nonlinear wave equations [PDF]
, 2016 The quadratic nonlinear wave equation on a one-dimensional torus with small initial values located in a single Fourier mode is considered. In this situation, the formation of metastable energy strata has recently been described and their long-time ...
Gauckler, Ludwig, Weiss, Daniel
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The influence of normal fault on initial state of stress in rock mass
Studia Geotechnica et Mechanica, 2016 Determination of original state of stress in rock mass is a very difficult task for rock mechanics. Yet, original state of stress in rock mass has fundamental influence on secondary state of stress, which occurs in the vicinity of mining headings.
Tajduś Antoni +2 more
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Stratification of the orbit space in gauge theories. The role of nongeneric strata [PDF]
, 2002 Gauge theory is a theory with constraints and, for that reason, the space of physical states is not a manifold but a stratified space (orbifold) with singularities. The classification of strata for smooth (and generalized) connections is reviewed as well
Arms J M +29 more
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The high-pressure sorptomat – a novel apparatus for volumetric sorption studies under isobaric high gas pressure conditions [PDF]
Metrology and Measurement Systems, 2022 As part of the work the high-pressure sorptomat - a novel apparatus for sorption tests under conditions of high gas pressure was developed. The sorption measurement is carried out using the volumetric method, and the precise gas flow pressure regulator ...
Mateusz Kudasik +2 more
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The relationship between stem vessel parameters and the development of strata in the early stages of secondary forest succession in Amazonia [PDF]
Acta Amazonica, 2002 In order to compare the development of strata in the early stages of secondary forest succession with vessel parameters of the tree species, a forest inventory was carried out in 4-year (Q1: 48 m2), 11-year (Q2: 400 m2) and 20-year (Q3: 400 m2) forests ...
Akio TSUCHIYA +4 more
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Journal of Sustainable Mining, 2019 This paper presents the authors' computational methods based on Knothe's theory. The methods enable the estimation of the reduction coefficient for effects which originate from mining operations performed via the application of a longitudinal structure ...
Rafał Misa +3 more
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PIV Measurements of Turbulent Airflow in a Channel with Trapezoidal Ribs on One Wall
Applied Sciences, 2022 This paper presents the results of PIV measurements of turbulent airflow in a channel with a single ribbed wall. The rough elements had the form of evenly spaced trapezoids. The ratio of the height of a single rib to the height of the measurement channel
Waldemar Wodziak, Jacek Sobczyk
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