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    Wyświetlanie 1-8 z 8
    Tytuł:
    Research on the milisecond delay blasting impact in order to minimize seismic effects in Kučín quarry surrounding
    Autorzy:
    Baulovič, J.
    Pandula, B.
    Kondela, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/92731.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    blasting operations
    seismic effect
    particle velocity
    seismic safety
    Opis:
    The intensity of seismic waves’ vibrations is proportional to the weight of the applied explosive. If the vibrations are sufficientin energy, surrounding buildings can be damaged or destroyed. Evaluating the negative effects of the blasting operations and quantification of the seismic safety is nowadays very actual and a challenging problem. The article presents the results of the analysis as well as an evaluation on seismic safety of the objects during blasting in the quarry Kučín. The results the evaluation seismic effects blasting verified in a Kučín quarry are the methodological base for evaluating the seismic effects of blasting in all quarries in Slovakia.
    Źródło:
    Materiały Wysokoenergetyczne; 2015, T. 7; 5-13
    2083-0165
    Pojawia się w:
    Materiały Wysokoenergetyczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparing selected parameters of a two-dimensional turbulent free jet on the basis of experimental results, digital simulations, and theoretical analyses
    Autorzy:
    Skotnicka-Siepsiak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/298451.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    2D free jet
    turbulent jet
    CFD
    spreading rate
    velocity profiles
    Coanda effect
    Opis:
    The presented experimental and digital examinations of a two-dimensional turbulent free jet are a first phase of in the study of the Coandă effect and its hysteresis. Additionally, basing on theoretical analyses, selected results for a turbulent jest have been also mentioned, considering theoretical assumptions for the wall layer. As the result, on the basis of experimental, digital, and analytical methods, a review of characteristic jet properties has been prepared, which includes a jet spreading ratio, its cross and longitudinal sections, and turbulence level. The jet spreading radio has been expressed as a non-linear function of the x : b relative length.
    Źródło:
    Technical Sciences / University of Warmia and Mazury in Olsztyn; 2017, 20(1); 31-48
    1505-4675
    2083-4527
    Pojawia się w:
    Technical Sciences / University of Warmia and Mazury in Olsztyn
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hall effects on isothermal vertical plate with uniform mass diffusion in the presence of rotating fluid and chemical reaction of first order
    Autorzy:
    Dhananjeya Kumaar, V. S. A.
    Muthucumaraswamy, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/265031.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    Hall effect
    chemical reaction parameter
    rotating fluid
    angular velocity
    efekt Halla
    reakcja chemiczna
    prędkość kątowa
    Opis:
    An exact solution of the combined study of Hall effects on a vertical plate with a rotating fluid in the presence of a homogeneous chemical reaction of first order has been analysed. The dimensionless governing coupled partial differential equations are tackled using the usual Laplace transform technique. The sway of the Hall parameter, Hartmann number, Grashof number, Prandtl number, Schmidt number, chemical reaction parameter on the axial velocity and concentration of the fluid has been depicted graphically. When the non-dimensional angular velocity, Ω=2M21+m.2, the transverse velocity component vanishes, thereby the axial velocity of the fluid attains the maximum value. It is noted that with increase in the Hall parameter, thermal Grashof number and mass Grashof number, the axial velocity of the fluid increases significantly.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2017, 22, 1; 111-121
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surrogate synthesis of excitation systems for frame tangential eddy current probes
    Autorzy:
    Halchenko, Volodymir Yakovych
    Trembovetska, Ruslana Volodymyrivna
    Tychkov, Volodymir Volodymyrovych
    Powiązania:
    https://bibliotekanauki.pl/articles/1955174.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    additive neural network regression
    eddy current probe
    stochastic optimization algorithm
    surrogate optimization
    uniform eddy current density distribution
    velocity effect
    addytywna regresja sieci neuronowej
    sonda prądów wirowych
    algorytm optymalizacji stochastycznej
    optymalizacja zastępcza
    równomierny rozkład gęstości prądów wirowych
    efekt prędkości
    Opis:
    Existing scientific studies devoted to the design of eddy-current probes with a priori given configuration of the electromagnetic excitation field, which provide a uniform eddy current density distribution, consider a wide class of such, but are limited to the case when the probe is stationary relative to the testing object. Therefore, the actual problem is the synthesis of moving tangential eddy current probes with a frame excitation system that provides a uniform eddy current density distribution in the testing object, the solution of which is proposed in this study. A mathematical method for nonlinear surrogate synthesis of excitation systems for frame moving tangential surface eddy current probes, which implements a uniform eddy current density distribution of the testing zone object, is proposed. A metamodel of the volumetric structure of the excitation system of the frame tangential eddy current probe, applied in the process of surrogate optimal parametric synthesis, has been created. The examples of nonlinear synthesis of excitation systems using modern metaheuristic stochastic algorithms for finding the global extremum are considered. The numerical results of the obtained solutions of the problems are presented. The efficiency of the synthesized structures of excitation systems in comparison with classical analogs is shown on the graphs of the eddy current density distribution on the object surface in the testing zone.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 4; 743-757
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of voids and backfill on seismic wave velocity-preliminary results
    Autorzy:
    Mukhamedyarova, Zarina
    Suorineni, Fidelis
    Aldubay, Temirlan
    Sapinov, Gylym
    Powiązania:
    https://bibliotekanauki.pl/articles/2201421.pdf
    Data publikacji:
    2022
    Wydawca:
    Główny Instytut Górnictwa
    Tematy:
    seismic event source location accuracy
    constantly changing mine conditions
    real-time seismic wave velocity
    void and cemented sand backfill effect with time
    dokładność lokalizacji źródła zdarzeń sejsmicznych
    stale zmieniające się warunki kopalniane
    prędkość fali sejsmicznej w czasie rzeczywistym
    Opis:
    In this study, laboratory experiments were conducted on discrete physical models that mimic mining effects to better understand the impact of continuous changes in mining environments on seismic wave velocities. The discrete physical models are represented by concrete and granite cubic samples of different sizes with holes of different diameters filled and unfilled with cemented sand backfill of different cement-sand content ratios. The hole diameters range from 0 to 150 mm in block sizes ranging from 150 mm to 450 mm in increments of 75 mm. The increasing hole size mimics increasing extraction in the mine with time. Cemented sand fills at cement contents ranging from 0 to 20% are used to fill the voids after testing them empty and retesting the same at different backfill cured ages. The SAEU3H AE eight-channel system is used in the study. Preliminarily results show that the impact of continuous changes in mining environments significantly affects the seismic wave velocities. The impact of voids and their contents on the seismic wave velocity depends on the sensor location relative to source and void, and it backfills cement content with time.
    Źródło:
    Journal of Sustainable Mining; 2022, 21, 4; 319--333
    2300-1364
    2300-3960
    Pojawia się w:
    Journal of Sustainable Mining
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of the gap diameter on the polymer thread temperature and velocity at the exit of the 3D printer nozzle
    Wpływ średnicy szczeliny na temperaturę i prędkość nici polimerowej na wyjściu z dyszy drukarki 3D
    Autorzy:
    Baeza-Campuzano, Alberto
    Morales-Castillo, Javier
    Castaño, Víctor M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2202615.pdf
    Data publikacji:
    2022
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
    Tematy:
    3D-printing
    gap diameter
    effect of temperature
    printing velocity
    druk 3D
    średnica szczeliny
    wpływ temperatury
    prędkość drukowania
    Opis:
    Using the example of acrylonitrile-butadiene-styrene (ABS) copolymer, the effect of the gap (thread) diameter for five printing velocity at 230°C on the thread temperature and velocity at the nozzle exit was investigated using the ANSYS Fluent simulation program. It was shown that the change of the gap diameter had a significant impact on the tested parameters.
    Wpływ średnicy szczeliny na temperaturę i prędkość nici polimerowej na wyjściu z dyszy drukarki 3D Abstrakt: Na przykładzie kopolimeru akrylonitryl-butadien-styren (ABS), za pomocą programu symulacyjnego ANSYS Fluent, zbadano wpływ średnicy szczeliny dla pięciu prędkości drukowania w temperaturze 230°C na temperaturę i prędkość nici na wyjściu z dyszy. Wykazano, że zmiana średnicy szczeliny miała istotny wpływ na badane parametry.
    Źródło:
    Polimery; 2022, 67, 7-8; 337--345
    0032-2725
    Pojawia się w:
    Polimery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Analysis of Atmospheric Water Harvester Using Ammonia Vapour Absorption System
    Autorzy:
    Qandil, Ahmed
    Othman, Ali
    Beithou, Nabil Ibrahim
    Powiązania:
    https://bibliotekanauki.pl/articles/2202359.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    atmospheric water harvester
    vapour absorption system
    velocity effect
    AWH analysis
    AWG application
    Opis:
    There are increasing concerns for the promising future of atmospheric water harvesters (AWH). AWH have been analysed theoretically and experimentally using different technologies such as Vapour Compression (VC) Thermoelectric (TE), Sorption (absorption, adsorption) and shape-based techniques. These techniques are suffering from low water harvesting or high energy consumption. The ammonia vapour absorption system (VAS) (which can be operated using renewable energy sources) has not yet been analysed experimentally. In this study, the AWH based on ammonia VAS has been studied experimentally, the effect of air flow velocity and ambient conditions have been analysed. The comparison between the existing techniques and VAS was performed to explore the possibility of implementing biomass, geothermal and solar energy in generating water from atmosphere, thus reducing the cost of the m3 of water produced.
    Źródło:
    Journal of Ecological Engineering; 2023, 24, 2; 221--229
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Non-invasive Ultrasound Doppler Effect Based Method of Liquid Flow Velocity Estimation in Pipe
    Autorzy:
    Biernacki, Paweł
    Gmyrek, Stanisław
    Magiera, Władysław
    Powiązania:
    https://bibliotekanauki.pl/articles/31339925.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    information fusion
    flow velocity
    Doppler effecT
    Opis:
    This paper discusses the estimation of flow velocity from a multi-sensor scenario. Different estimation methods were used, which allow the effective measurement of the actual Doppler shift in a noisy environment, such as water with air bubbles, and on this basis the estimation of the flow velocity in the pipe was calculated. Information fusion is proposed for the estimates collected. The proposed approach focuses on the density of the fluid. The proposed method is capable of determining the flow velocity with high accuracy and small variations. Simulation results for plastic and steel (both galvanized and non-galvanized) pipes show the possibility of accurate fluid flow measurements without the need for sensors inside the pipe.
    Źródło:
    Archives of Acoustics; 2023, 48, 1; 141-148
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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