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    Tytuł:
    Operational characteristic of wireless WiMax and IEEE 802.11x systems in underground mine environments
    Autorzy:
    Kowal, M.
    Kubal, S.
    Piotrowski, P.
    Zieliński, R. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/227021.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    WLAN
    WiMAX
    throughput
    delay
    mine environment
    Opis:
    The paper presents research results pertaining to transmission parameters of wireless communication systems, based on WiMax and IEEE 802.11x radio interfaces. Research was performed in severe operating conditions of an underground mine - testing various parameters, such as: throughput, delays and maximum range.
    Źródło:
    International Journal of Electronics and Telecommunications; 2010, 56, 1; 81-86
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of different delivery conditions on the accelerated degradation of structural steel in the coal mine environment
    Wpływ różnego stanu dostawy na przyspieszoną degradację stali konstrukcyjnej w środowisku kopalnianym
    Autorzy:
    Pawłowski, B.
    Bała, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/219964.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    środowisko kopalniane
    korozja
    podwieszana kolejka szynowa
    stal konstrukcyjna
    coal mine environment
    corrosion
    monorail transport system
    structural steel
    Opis:
    The main objective of this work was to determine the effect of different delivery conditions on the accelerated degradation of structural steels used for lifting beams (rails) of the monorail transport systems. Some of these rails, made of the same steel grade as others, undergoes accelerated corrosion in the coal mine environment. Corrosion degradation occurs much faster (more than two times faster), comparing to the same steel grade rails operated under the same conditions but with different microstructures. However, all the provided rails meet the requirements of appropriate standards for steel on the lifting beams of the monorail transport systems. The investigations were carried out on rails made of the same steel grade but with different microstructures and showed that the main factor influencing the accelerated corrosion degradation of tested steels is the delivery condition, so-called “as rolled” condition. The greatest resistance to the accelerated corrosion showed rails in the normalized or normalizing rolling condition.
    Głównym celem pracy było określenie wpływu warunków dostawy stali konstrukcyjnych stosowanych na elementy nośne podwieszanej kolejki szynowej na ich przyspieszoną degradację korozyjną. Niektóre z szyn, wykonanych z tego samego gatunku stali co pozostałe, ulegały przyspieszonej korozji w środowisku kopalnianym ponad dwukrotnie szybciej w porównaniu z szynami dostarczonymi przez innych dostawców i pracującymi w tych samych warunkach. Jednocześnie wszystkie szyny spełniały wymagania odpowiednich norm dotyczących stali na elementy nośne szynowych kolejek podwieszanych. Badania wykonane na szynach dostarczonych z tego samego gatunku stali ale o różnych mikrostrukturach wykazały, że głównym czynnikiem wpływającym na przyspieszoną degradację korozyjną stali konstrukcyjnych jest ich stan dostawy. Największą odporność na korozję wykazały szyny w stanie normalizowanym lub po walcowaniu normalizującym.
    Źródło:
    Archives of Mining Sciences; 2012, 57, 4; 945-950
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sensitivity analysis of the effect of airflow velocity on the thermal comfort in underground mines
    Autorzy:
    Roghanchi, P.
    Kocsis, K.
    Sunkpal, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/92169.pdf
    Data publikacji:
    2016
    Wydawca:
    Główny Instytut Górnictwa
    Tematy:
    underground mine environment
    airflow velocity limit
    sweat rate
    skin wetness
    tolerable exposure time
    ograniczenie prędkości przepływu powietrza
    intensywność pocenia
    wilgotność skóry
    tolerowalny czas ekspozycji
    Opis:
    Displeasure in respect to air volumes and associated airflow velocities are well-documented complaints in underground mines. The complaints often differ in the form that there is too little airflow velocity or too much. In hot and humid climates such as those prevailing in many underground mines, convection heat transfer is the major mode of heat rejection from the human body, through the process of sweat evaporation. Consequently, the motion of the mine air plays a pivotal role in aiding this process. In this paper, a method was developed and adopted in the form of a “comfort model” to predict the optimum airflow velocity required to maintain heat comfort for the underground workforce at different activity levels (e.g. metabolic rates). Simulation analysis predicted comfort limits in the form of required sweat rate and maximum skin wetness. Tolerable worker heat exposure times were also predicted in order to minimize thermal strain due to dehydration. The results indicate that an airflow velocity in the range of 1 e2 m/s is the ideal velocity in order to provide a stress/strain free climate and also guarantee thermal comfort for the workers. Therefore, an optimal airflow velocity of 1.5 m/s for the miners' thermal comfort is suggested.
    Źródło:
    Journal of Sustainable Mining; 2016, 15, 4; 175-180
    2300-1364
    2300-3960
    Pojawia się w:
    Journal of Sustainable Mining
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radon events in the U-mine environment and related radiation exposure
    Autorzy:
    Križman, M. J.
    Rojc, J.
    Peter, J. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/148916.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    radon
    uranium mine
    environment
    radon event
    effective dose
    Opis:
    The term �gradon event�h indicates here a sudden appearance of enhanced radon concentrations, observed like well expressed peaks in time series of radon concentrations. The peaks are superimposed on normal diurnal periodical curves. The characteristics of radon events are high peak values, a rather short duration and a low radon equilibrium factor. Since radon events appear only in the environment near significant radon emission sources, they were investigated in more detail in the case of the former .irovski Vrh uranium mine (Slovenia), using the existing network of continuous radon progeny measuring devices. Eight different types of radon events were identified in the vicinity of the U-mine disposal sites, lasting for some hours and with the range of their peak levels of equilibrium equivalent concentrations (EEC) of radon from a few Bq�Em.3 to over 200 Bq�Em.3. Exposures to radon events in units of Bq�Eh�Em.3 were estimated for adult individuals of the reference group. They resulted in relatively high effective doses of the range 1.5 �ĘSv per a single event, thus exceeding, e.g. the total effective dose for the public due to radioactive discharges from most nuclear facilities during the whole year.
    Źródło:
    Nukleonika; 2010, 55, 4; 529-533
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on the environmental impact of industrial noise emitted by mine and mining plants
    Autorzy:
    Mocek, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/2204119.pdf
    Data publikacji:
    2022
    Wydawca:
    STE GROUP
    Tematy:
    mining technological processes
    mine
    noise
    environment
    hazard
    mining plant
    Opis:
    The article presents the results of measurements of environmental noise accompanying the operation of devices operated in surface facilities of hard coal mines and noise generated in technological processes related to the loading and transport of spoil and materials necessary for production. The research results presented in the article are part of the program of "Consequences of excessive noise in the mining environment of hard coal mines", the overarching goal of which is to reduce the emission of industrial noise. The research described in the article, carried out using the sampling method, was introduced in order to determine the actual values of noise levels emitted to the external environment from mines and mining plants, as well as to identify the acoustic power levels of devices and processes constituting the main sources of noise in mines. The obtained results showed that mines and mining plants are often not fully aware of the scale of the environmental impact of undesirable noise they emit. Therefore, the current periodic measurements of environmental noise should be replaced with permanent monitoring, which will be beneficial not only for the environment, residents of housing estates located near mines, but also for the mining plants themselves.
    Źródło:
    Management Systems in Production Engineering; 2022, 2 (30); 146--155
    2299-0461
    Pojawia się w:
    Management Systems in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Environmental protection against acid mine drainage (AMD) testing of sulphide mining waste enrichment of the Chaabet-El-Hamra mine (Algeria)
    Autorzy:
    Benabbes, Lamia
    Bounouala, Mohamed
    Powiązania:
    https://bibliotekanauki.pl/articles/1402325.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
    Tematy:
    mining waste
    sulphide ores
    AMD
    acid mine drainage
    characterization
    environmental desulfurization
    flotation
    environment
    Opis:
    The mining waste from the Chaabet-El-Hamra mine contains sulfides such as pyrite (FeS2), galena (PbS) and chalcopyrite (CuFeS2) Which pose a threat to the environment. Sulphide minerals under the effect of oxygen and in the presence of water cause a phenomenon of acid mine drainage. Samples taken at the site of the sulphide mine waste at the Chaabet El Hamra mine and subsequently subjected to chemical analyzes offered an average sulfur content of 9%. X-ray diffractometer analyzes confirm the presence of a considerable inclusion of pyrite containing secondary minerals of sphalerite, and galena. To do this, the tests were directed to an environmental desulphurization process by flotation of the pyriterich fraction with depression of the low sulfur mineralogical matrix containing heavy metals of zinc and lead.
    Źródło:
    Mining Science; 2020, 27; 323-335
    2300-9586
    2353-5423
    Pojawia się w:
    Mining Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Environmental impact of noise from mining operations
    Autorzy:
    Mocek, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/29521063.pdf
    Data publikacji:
    2023
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    mine
    ventilation shaft
    main fans
    noise
    environment
    hazard
    noise measurements
    single and multi-family housing
    Opis:
    The article presents the results of measurements of environmental noise caused by devices operating in the surface facilities of hard coal mines and by the technological processes related to the loading and transport of spoil and materials necessary for production. The research results are part of the program “Consequences of excessive noise in the mining environment of hard coal mines”, the overarching goal of which is to reduce the emission of industrial noise. A sampling method was used to determine the actual values of noise levels emitted to the external environment from mines and mining plants as well as to identify the acoustic power levels of devices and processes constituting the main sources of noise in mines. The results showed that mines and mining plants are often not fully aware of the scale of the environmental impact of the undesirable noise they emit. Therefore, the current periodic measurements of environmental noise should be replaced with permanent monitoring, which will be beneficial not only for the environment and residents of housing estates located near mines but also for the mining plants themselves.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2023, 73 (145); 15-28
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Building a non-homogeneous thermal environment for energy savings in the face of deep mines
    Autorzy:
    Li, Xian
    Wu, Yaru
    Zhang, Yunfei
    Powiązania:
    https://bibliotekanauki.pl/articles/2073873.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    kopalnia
    chłodzenie kopalni
    klimatyzacja w kopalni
    mine face
    cooling strategy
    non-homogeneous environment
    air cooler
    necessary cooling space
    Opis:
    Heat exhaustion of mining environments can cause a significant threat to human health. The existing cooling strategies for the mine face aim to cool the whole face. However, the necessary cooling space for the face is small, with a considerable amount of energy for cooling being wasted. Necessary cooling space is a space occupied by the workers in the face. This study proposed to build a non-homogeneous thermal environment for cost-effective energy savings in the face. An inlet air cooler was laid out in the intake airway to cool the whole face to some extent, and the tracking air cooler was designed to track the worker who constantly moved to improve the thermal environment. The cooling load and air distribution for this cooling strategy were investigated. In addition, the airflow in the face was solved numerically to estimate the cooling effect. The results revealed that an average energy saving of approximately 35% could be achieved. The thermal environment of the necessary cooling space within at least 10 m was significantly improved. This cooling strategy should be taken into account in mine cooling.
    Źródło:
    Archives of Mining Sciences; 2021, 66, 3; 457--474
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reduction of Saline Waters Discharge from Coal Mines Through Filling and Sealing of Underground Voids
    Autorzy:
    Strozik, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/1179625.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    environment protection
    filling of underground voids
    fly ash water mixtures
    mine waters management
    protection of watercourses
    salinized waters discharge
    Opis:
    Drainage and discharge of mine waters belong to main environmental issues that must be appropriately addressed by underground coal mining industry. Large area of mine fields in Upper Silesia Coal Basin (USCB), which belong both to currently active and already closed mine, together with the geological and hydrogeological structure of the rock mass in USCB, create conditions requiring drainage and discharge of about 118 million m3/yr of mine waters of differentiated salinization. Increasing average depth of mining works and necessity of drainage of numerous closed mines results in increasing amounts of chlorides and sulphates being introduced into water environments, even then coal production of Polish mining industry is decreasing. Majority of mines waters are discharging directly to watercourses and the only significant environmental protection measure is control of the concentration of salt in main rivers. Balance of mine waters and Clˉ + SO42- ions demonstrates weight of this issue and give a background, on which technology of filling of underground voids has been discussed as a method, which, under several conditions, may reduce the discharge of brines and highly salinized mine waters (mineralisation above 42 g/dm3) by about 30%. Although technology of filling of voids with mixtures of water and finely grained solids (mostly fly ash) is well known and adopted by most of coal mines, its potential in reduction of saline waters discharge is being wasting due to inconsequence in its use and underestimating its value in terms of saline waters management. Influence of waters salinity on the physical properties of the fill, as well as benefits gained by the coal mines as result of filling of voids, show that this operations should be conducted in the possibly largest extent, limited only by availability of fly ash and volume of voids, being created as result of coal extraction.
    Źródło:
    World Scientific News; 2017, 72; 10-25
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reduction of Saline Waters Discharge from Coal Mines Through Filling and Sealing of Underground Voids
    Autorzy:
    Strozik, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/1181185.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    environment protection
    filling of underground voids
    fly ash water mixtures
    mine waters management
    protection of watercourses
    salinized waters discharge
    Opis:
    Drainage and discharge of mine waters belong to main environmental issues that must be appropriately addressed by underground coal mining industry. Large area of mine fields in Upper Silesia Coal Basin (USCB), which belong both to currently active and already closed mine, together with the geological and hydrogeological structure of the rock mass in USCB, create conditions requiring drainage and discharge of about 118 million m3/yr of mine waters of differentiated salinization. Increasing average depth of mining works and necessity of drainage of numerous closed mines results in increasing amounts of chlorides and sulphates being introduced into water environments, even then coal production of Polish mining industry is decreasing. Majority of mines waters are discharging directly to watercourses and the only significant environmental protection measure is control of the concentration of salt in main rivers. Balance of mine waters and Clˉ + SO42ˉ ions demonstrates weight of this issue and give a background, on which technology of filling of underground voids has been discussed as a method, which, under several conditions, may reduce the discharge of brines and highly salinized mine waters (mineralisation above 42 g/dm3) by about 30%. Although technology of filling of voids with mixtures of water and finely grained solids (mostly fly ash) is well known and adopted by most of coal mines, its potential in reduction of saline waters discharge is being wasting due to inconsequence in its use and underestimating its value in terms of saline waters management. Influence of waters salinity on the physical properties of the fill, as well as benefits gained by the coal mines as result of filling of voids, show that this operations should be conducted in the possibly largest extent, limited only by availability of fly ash and volume of voids, being created as result of coal extraction.
    Źródło:
    World Scientific News; 2017, 72; 498-512
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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