Zobrazeno 1 - 10
of 14
pro vyhledávání: '"Andrzej Krach"'
Publikováno v:
Energies, Vol 14, Iss 21, p 6907 (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. This paper presents selected observations and tests carried out in the Cw-4 lon
Externí odkaz:
https://doaj.org/article/2a3c4f3ba88643a298ea1de751da46e5
Publikováno v:
Energies, Vol 13, Iss 21, p 5559 (2020)
This paper presents a relatively simple method to analyze potential methane hazard and preventive methods based on a computer simulation of the airflow and methane emission on the longwall face and in the goaf. The presented approach considers the op
Externí odkaz:
https://doaj.org/article/538a63b6f55b424d8026517a3acd106d
Publikováno v:
Energies, Vol 10, Iss 10, p 1451 (2017)
This paper presents a method for determining the sensitivity of the main air flow directions in ventilation subnetworks to changes in aerodynamic resistance and air density in mine workings. The authors have developed formulae for determining the sen
Externí odkaz:
https://doaj.org/article/634a89ec26ae498e84793e902a9466cb
Publikováno v:
Energies, Vol 14, Iss 6907, p 6907 (2021)
Energies
Volume 14
Issue 21
Energies
Volume 14
Issue 21
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. This paper presents selected observations and tests carried out in the Cw-4 lon
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f5f73996343375c9cde8675274bf5e13
Autor:
Andrzej Krach, Janusz Kruczkowski
Publikováno v:
Metrologia. 53:1012-1023
This article presents the calibration of a system for measuring air flow velocity in a wind tunnel with a multiple-hole orifice. The comparative method was applied for the calibration. The method consists in equalising the air flow velocity in a test
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bd9f1b29f96f650f91816c55f3cf204e
https://doi.org/10.1088/0026-1394/53/4/1012
https://doi.org/10.1088/0026-1394/53/4/1012
Publikováno v:
Archives of Mining Sciences. 60:3-24
Forecasting a ventilation process is based on two factors: using a validated software (Dziurzyński et al., 2011; Pritchard, 2010) and a properly prepared database encompassing the parameters describing the flow of air and gases, compatible with the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d62b96e072f6a1bda0b31163babb07ae
https://doi.org/10.1515/amsc-2015-0001
https://doi.org/10.1515/amsc-2015-0001
This paper presents a methodology for determining the sensitivity of the main air flow directions in ventilation subnetworks to changes of aerodynamic resistance and of air density in mine workings. Formulae for determination of the sensitivity of th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2f370f4200e4bf2aa31f150e9d661d98
Autor:
Andrzej Krach
Publikováno v:
Archives of Mining Sciences. 59:1097-1105
The present paper discusses determining diagonal branches in a mine ventilation network by means of a method based on the relationship A⊗ PT(k, l) = M, which states that the nodal-branch incidence matrix A, modulo-2 multiplied by the transposed pat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a0e6bc6a079024b2543bf8e7a16acea3
https://doi.org/10.2478/amsc-2014-0076
https://doi.org/10.2478/amsc-2014-0076
Publikováno v:
Archives of Mining Sciences. 59:3-23
In the paper the results of investigations aimed at further identification of the phenomena occurring in abandoned workings and connected with the flow of air-gas (methane, carbon dioxide, nitrogen, oxygen and carbon oxidation products) mixture with
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e328de639fe69d7b92d49e8d4ec066be
https://doi.org/10.2478/amsc-2014-0001
https://doi.org/10.2478/amsc-2014-0001
Autor:
Wacław Dziurzyński, Małgorzata Wysocka, Krystian Skubacz, J. Krawczyk, T. Pałka, B. Michalik, Andrzej Krach
Publikováno v:
Science of The Total Environment. 695:133853
For many years, the legal regulations governing radiation protection were primarily concerned with artificial radioactivity, omitting in practice the hazards associated with the occurrence of natural radioactivity in non-nuclear industry. Meanwhile,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::14fa5a400c2d7b58bc908a863a028050
https://doi.org/10.1016/j.scitotenv.2019.133853
https://doi.org/10.1016/j.scitotenv.2019.133853