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    Wyświetlanie 1-6 z 6
    Tytuł:
    A Methodology for Assessing Blast Protection in Explosive Ordnance Disposal Bomb Suits
    Autorzy:
    Bass, C.
    Davis, M.
    Rafaels, K.
    Rountree, M.
    Harris, R. M.
    Sanderson, E.
    Andrefsky, W.
    DiMarco, G.
    Zielinski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/90267.pdf
    Data publikacji:
    2005
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    blast pressure
    human surrogate
    bomb suits
    injury risk
    head injury
    neck injury
    thoracic injury
    ochrona przed wybuchem
    wybuch
    kombinezon
    zagrożenia mechaniczne
    środki ochrony indywidualnej
    wojsko
    Opis:
    To reduce human casualties associated with explosive ordnance disposal, a wide range of protective wear has been designed to shield against the blast effects of improvised explosive devices and munitions. In this study, 4 commercially available bomb suits, representing a range of materials and armor masses, were evaluated against 0.227 and 0.567 kg of spherical C-4 explosives to determine the level of protection offered to the head, neck, and thorax. A Hybrid III dummy, an instrumented human surrogate [1], was tested with and without protection from the 4 commercially available bomb suits. 20 tests with the dummy torso mounted to simulate a kneeling position were performed to confirm repeatability and robustness of the dummies, as well as to evaluate the 4 suits. Correlations between injury risk assessments based on past human or animal injury model data and various parameters such as bomb suit mass, projected area, and dummy coverage area were drawn.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2005, 11, 4; 347-361
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    3D Model Studies on the Effect of Bed and Powder Type Upon Radial Static Pressure and Powder Distribution in Metallurgical Shaft Furnaces
    Autorzy:
    Panic, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/351694.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    blast furnace
    system descending packed bed–gas-powder
    pressure
    holdup powder
    Opis:
    The flow of gases in metallurgical shaft furnaces has a decisive influence on the course and process efficiency. Radial changes in porosity of the bed cause uneven flow of gas along the radius of the reactor, which sometimes is deliberate and intentional. However, holdup of solid particles in descending packed beds of metallurgical shaft furnaces can lead to unintentional changes in porosity of the bed along the radial reactor. Unintentional changes in porosity often disrupt the flow of gas causing poor performance of the furnace. Such disruptions of flow may occur in the blast furnace due to high level of powder content in gas caused by large amount of coal dust/powder insufflated as fuel substitute. The paper describes the model test results of radial distribution of static pressure and powder hold up within metallurgical reactor. The measurements were carried out with the use of 3D physical model of two-phase flow gas-powder in the moving (descending) packed bed. Sinter or blast furnace pellets were used as packed bed while carbon powder or iron powder were used as the powder. Wide diversity within both static pressure distribution and powder distribution along the radius of the reactor were observed once the change in the type of powder occurred.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 3; 1449-1452
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Contribution to the Valorization of Granulated Blast Furnace Slag in Soil Stabilization
    Autorzy:
    Djouimaa, Sarah
    Missaouri, Sabrina
    Handel, Naoual
    Sid, Madani
    Powiązania:
    https://bibliotekanauki.pl/articles/2051599.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    swelling pressure
    granulated blast furnace slag
    cement
    stabilization
    SEM analysis
    ciśnienie pęcznienia
    żużel granulowany
    stabilizacja
    analiza SEM
    Opis:
    The treatment of expansive soil is generally the most effective process for the stabilization of swelling clay. In this work, we will investigate the influence of the treatment of an expansive soil using granulated blast furnace slag (GGBS) alone and granulated blast furnace slag activated by cement (GGBS/C) by mechanical, physical and chemical tests. The results obtained show an increased pH, an improved plasticity as well as a significant reduction in swelling potential and swelling pressure following a percentage increase in additives. In addition, a change in the adsorption of methylene blue molecules (VBs) and in the microstructure of the expansive soil is observed after treatment. Utilization of both GGBS alone and GGBS activated by cement has a significant effect on the behavior of the swelling clay but the GGBS activated by cement exhibits superior results. The use of GGBS in the stabilization of soil will have both economic and environmental benefits.
    Źródło:
    Civil and Environmental Engineering Reports; 2021, 31, 3; 134-151
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of Pressure Distribution in Buried Pipes with Liquid in the Explosion
    Autorzy:
    Parviz, M.
    Aminnejad, B.
    Fiouz, A. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/230958.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    rura zakopana
    metoda Lagrange’a-Eulera
    podmuch
    ciśnienie
    Ls-Dyna
    buried pipe
    Lagrangian-Eulerian method
    blast
    pressure
    Opis:
    In this Paper, a parametric study on pipes buried in soil was performed illustrating the results of blast loading. Effects of various parameters such as the physical properties of water, oil, gas, air, soil, pipes, and TNT have been investigated. The arbitrary Lagrangian-Eulerian (ALE) method was employed using LS-DYNA software. The maximum pressure in a buried pipe explosive was observed at an angle of about 0° to 45° and the minimum pressure occurred at an angle of about 45° to 90°. Therefore, all figures in this study illustrate that fluid pressure levels in buried pipes can help in their stabilization. In generally, by increasing the 1.23 times of liquid density under the explosion, the pressure levels in the soil decreased by 1.3 percent. The gas pressure has been increasing more than oil and water pipes 39.73 and 40.52 percent, respectively.
    Źródło:
    Archives of Civil Engineering; 2019, 65, 3; 3-14
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Explosion Characteristics of Blast Furnace Gas
    Charakterystyka wybuchowa gazu wielkopiecowego
    Autorzy:
    Skrinsky, J.
    Veres, J.
    Kolonicny, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/318114.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    maksymalne ciśnienie wybuchu
    stała objętość
    temperatura adiabatyczna
    gaz wielkopiecowy
    maximum explosion pressure
    blast furnace gas
    constant volume
    adiabatic temperature
    Opis:
    The main focus of this contribution is the explosion characteristics and hazards arising from the blast furnace gas. Primarily, these are the hazards of fire and explosion induced by flammable components of blast furnace gas. In order to prevent explosions when storing and handling blast furnace gas it is necessary to know the explosion limits of individual gas components and its gas mixtures in mixture with air. However, blast furnace gas from different blast furnace can vary significantly in its composition. Therefore, for each gas composition the explosion limits would have to be determined. This would require a considerable amount of time and effort. Due to this fact, the explosion limits of blast furnace gas are frequently referred to only by the hydrogen fraction of the gas mixture in the safety-relevant literature. In reality as blast furnace gas consists of hydrogen, carbon monoxide, carbon dioxide and further residual gases the explosion limits are generally over or underestimated.
    Celem artykułu jest charakterystyka i zagrożenia wynikające z wybuchu gazu wielkopiecowego. Niebezpieczeństwo pożaru i wybuchu wywołane jest przez łatwopalne składniki gazu wielkopiecowego. Aby zapobiec wybuchom w trakcie powstawania gazu wielkopiecowego konieczne jest poznanie granic wybuchowości poszczególnych składników gazu i mieszanin gazowych z powietrzem. Gaz wielkopiecowy z różnych wielkich pieców może się znacznie różnić pod względem składu. W związku z tym, dla każdego składu gazu należy określić granice wybuchowości. Wymaga to znacznego czasu i wysiłek. Z tego powodu granice wybuchu gazu wielkopiecowego są często określane (w literaturze dotyczącej bezpieczeństwa) tylko przez zawartość frakcji wodorowej w mieszaninie gazowej. W rzeczywistości gaz wielkopiecowy składa się z wodoru, tlenku węgla, dwutlenku węgla i innych gazów resztkowych. Granice wybuchowości są generalnie przekroczone.
    Źródło:
    Inżynieria Mineralna; 2018, R. 19, nr 1, 1; 131-136
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application cumulative tensile explosions for roof cutting in Chinese underground coal mines
    Autorzy:
    Yang, Jun
    Liu, Binhui
    Bian, Wenhui
    Chen, Kuikui
    Wang, Hongyu
    Cao, Chen
    Powiązania:
    https://bibliotekanauki.pl/articles/2073869.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    roboty strzałowe
    wysadzanie skał
    kopalnia
    cumulative blast
    bilateral cumulative tensile explosion
    roof cutting and pressure relief technology
    gob-side entry retaining
    Opis:
    Cumulative blasts are an important controlled blasting method used to control the propagation of cracks in the predetermined direction. However, traditional cumulative blasts are associated with long processing times and poor blasting effects. A simple blasting technology called bilateral cumulative tensile explosion (BCTE) is proposed in this paper. There are two application types where BCTE is used. The first application is used to control the stability of high-stress roadways in both Wangzhuang mine 6208 tailgate and Hongqinghe mine 3-1103 tailgate. The second application is used to replace the backfill body in gob-side entry retaining (GER) in Chengjiao mine 21404 panel, Jinfeng mine 011810 panel and Zhongxing mine 1200 panel. The first application type reveals that BCTE can significantly reduce the deformation of the surrounding rock and reduce the associated maintenance cost of the roadways. Whereas the second application type, the roadway deformations are smaller, the process is simpler, and the production costs are lower, which further promotes GER and is of significance towards conserving resources.
    Źródło:
    Archives of Mining Sciences; 2021, 66, 3; 421--435
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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