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    Wyświetlanie 1-15 z 15
    Tytuł:
    Experimental study of the formation of steep waves and breakers
    Autorzy:
    Massel, S.R.
    Tegowski, J.
    Chomka, M.
    Wichorowski, M.
    Dabrowski, J.
    Stansberg, C.T.
    Moe, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/47742.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    sea surface
    surface wave
    open sea
    surface gravity wave
    wave breaking
    wave formation
    steep wave
    Opis:
    Breaking waves (whitecaps) are one of the most important and least understood processes associated with the evolution of the surface gravity wave field in the open sea. This process is the principal means by which energy and momentum are transferred away from a developing sea. However, an estimation of the frequency of breaking waves or the fraction of sea surface covered by whitecaps and the amount of dissipated energy induced by breaking is very difficult to carry out under real sea conditions. A controlled experiment, funded by the European Commission under the Improving Human Potential Access Infrastructures programme, was carried out in the Ocean Basin Laboratory at MARINTEK, Trondheim (Norway). Simulation of random waves of the prescribed spectra by wave makers provided a very realistic pattern of the sea surface. The number of breaking waves was estimated by photographing the sea surface and recording the noise caused by the breaking waves. The experimental data will serve for calibration of the theoretical models of the sea surface fraction related to the whitecaps.
    Źródło:
    Oceanologia; 2001, 43, 3; 353-363
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stokes transport in layers in the water column based on long-term wind statistics
    Autorzy:
    Myrhaug, D.
    Wang, H.
    Holmedal, L.R.
    Powiązania:
    https://bibliotekanauki.pl/articles/48704.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    surface gravity wave
    water column
    water transport velocity
    wind
    Stokes transport
    North Sea
    North Atlantic
    Źródło:
    Oceanologia; 2018, 60, 3
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Addendum to “Stokes transport in layers in the water column based on long-term wind statistics: assessment using long-term wave statistics”
    Autorzy:
    Myrhaug, D.
    Wang, H.
    Holmedal, L.E.
    Powiązania:
    https://bibliotekanauki.pl/articles/47811.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    surface gravity wave
    water transport velocity
    Stokes transport
    water column
    wind statistics
    long-term wave statisticsstatistic
    Źródło:
    Oceanologia; 2019, 61, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study of Quantum Effects in General Relativity
    Autorzy:
    Sooriyaarachchi, V. K. C.
    Wijewardena Gamalath, K. A. I. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1058092.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Hawking effect
    Rindler observer
    Schwarzschild black hole
    Unruh effects
    event horizon
    information loss paradox
    scalar curvature
    surface gravity
    transplanckian problem
    Opis:
    The present work discusses the conceptual and technical issues encountered in formulating a quantized theory of gravity, via the reconciliation of quantum mechanics and general relativity. Quantum effects arising in a classically defined space-time derived through a semi classical approximation are studied at length and the significance of the particle interpretation in quantum field theory in the origin of such effects is established. The contradicting nature of the quantum effects against classically established principles is studied by considering the Hawking effect in a Schwarzschild black hole space-time. Further, the limits of prominent manifestation of the quantum effects with regards to the black hole mass is calculated taking into consideration the cosmic microwave background and the lifetime of the universe. Quantum effects are established as essential in incorporating thermal physics and black hole mechanics in a consistent formulation. Finally, the validity of the semi classical approximation is studied in terms of Planck scale black holes, transplanckian problem and the information loss paradox and the requirement for a fully quantized theory of gravity is realized.
    Źródło:
    World Scientific News; 2019, 134, 2; 198-219
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of capillarity on fourth order nonlinear evolution equation for two Stokes wave trains in deep water in the presence of air flowing over water
    Autorzy:
    Dhar, A. K.
    Mondal, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/265884.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    nonlinear evolution equation
    surface capillary gravity wave
    stability
    grawitacja
    fala kapilarna
    równania nieliniowe
    Opis:
    Fourth order nonlinear evolution equations, which are a good starting point for the study of nonlinear water waves, are derived for deep water surface capillary gravity waves in the presence of second waves in which air is blowing over water. Here it is assumed that the space variation of the amplitude takes place only in a direction along which the group velocity projection of the two waves overlap. A stability analysis is made for a uniform wave train in the presence of a second wave train. Graphs are plotted for the maximum growth rate of instability wave number at marginal stability and wave number separation of fastest growing sideband component against wave steepness. Significant improvements are noticed from the results obtained from the two coupled third order nonlinear Schrödinger equations.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2015, 20, 2; 267-282
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A preliminary investigation of dry gravity separation with low specific gravity ores using a laboratory Knelson Concentrator
    Autorzy:
    Zhou, Meng
    Kökkılıç, Ozan
    Langlois, Raymond
    Waters, Kristian E.
    Powiązania:
    https://bibliotekanauki.pl/articles/24085570.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Knelson concentrator
    dry gravity separation
    response surface method
    Box-Behnken design
    Opis:
    It has become an active research area for treating low specific gravity (SG) deposits by centrifugal separation due to its high efficiency, low cost and minor environmental impact. Laboratory Knelson Concentrator has shown its potential for processing high density ores on a dry basis. This study investigated the feasibility and the optimum operating conditions when processing a dry low SG feed with a modified Knelson Concentrator. A synthetic mixture of magnetite and quartz with a grade of 1% magnetite was used to mimic a low-density ratio ore. Bowl speed (G), air fluidizing pressure (psi) and solids feed rate (g/min) were chosen as the operating variables. Box-Behnken design was used to design the experiments and response surface method was used for optimization. The effects of each individual factors and their interactions on concentrate grade and magnetite recovery were evaluated. The dry process achieved up to 60 % magnetite recovery with an upgrade ratio of 5. The optimized values for the concentration with the highest recovery and grade of bowl speed, solids feed rate and air fluidizing pressure are 27 G, 200 g/min and 12 psi, respectively.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 5; art. no. 165992
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the reduction of geodetic and gravimetric measurements on technogenic and geodynamic polygons
    Autorzy:
    Perovych, Lev
    Perovych, Igor
    Gorlachuk, Valeriy
    Powiązania:
    https://bibliotekanauki.pl/articles/145497.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    przyspieszenie grawitacyjne
    grawitacja
    korekta
    correction
    gravitational acceleration
    level surface
    gravity reduction
    Opis:
    When conducting geodetic and gravimetric measurements, there is a problem of projecting them to the reference surface. Since the gravitational field is inhomogeneous under the real conditions, the problem arises of determining the corrections to the measured values of gravitational acceleration in order to use the obtained data for the subsequent solutions of projection problems. Currently, the solution to this problem is performed using a Bouguer reduction, which requires information about the internal structure of the upper layer of the earth’s surface, topography, etc. The purpose of this study is to develop a methodological approach that would allow to determine the reduction (projection) corrections for gravitational acceleration on technogenic and geodynamic polygons without using data about the distribution of surface layer density and topography. The research process is based on the use of mathematical analysis methods and a wide range of experimental geodetic and gravimetric measurements. In the course of the performed researches, an algorithm was obtained and a practical implementation of the determination of the corrections in the measured values of gravitational acceleration on the basis of geodetic and gravimetric measurements was carried out at the certain geodynamic polygon in order to bring all corrections to one level surface.
    Źródło:
    Geodesy and Cartography; 2020, 69, 1; 65-72
    2080-6736
    2300-2581
    Pojawia się w:
    Geodesy and Cartography
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Condensed Geometry II: New Constraints, Temporal Confinement Phase and Structure and Interpretation of Space and Time
    Autorzy:
    Kabe, Koustubh
    Powiązania:
    https://bibliotekanauki.pl/articles/1190218.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Ashtekar variables
    Loop Quantum Gravity
    surface states
    phase transitions
    string theory
    Opis:
    In this paper we basically intend to deductively study aspects and physical behavior of time in the Quantum Mechanical and Loop Quantum Gravity regime and the physical interpretations therein. The implicit gauge invariance of the vortical time is deduced. A new form of the Hamiltonian constraint is produced and the corresponding Vector or Diffeomorphism constraint is also introduced, the Gauss constraint being found to be the same as that in the original. The new consequences are discussed. The paper presents fresh new ideas and interpretations as well as perspectives on the spatial as well as the now introduced temporal aspects of Loop Quantum Gravity. In this we basically intend to deductively study aspects and physical behavior of Time in the Quantum Mechanical and Loop quantum gravity regime and the physical interpretations therein. In what follows, we provide a systematic mathematico-physical treatment of the vortical aspect of quantum gravity or a test quantum system, relative to space, as the time for that system. The implicit gauge invariance of the vortical time is deduced. A general theory of implicit and explicit gauge invariance is proposed. The gauging out of the acausality gauge degree of freedom is deduced and the causal direction of time is shown to nucleate out as a self ordered criticality due to a “tweaking” field which is shown to be a form of magnetic phase transition. This magnetic phase arising in the Kodama holomorphic wave functional universe, arises naturally due to the Ashtekar “magnetic” field in general. Also the wave-particle duality of gravity/ geometry as a quantum system is interpreted in terms of the physical role played by time. The long standing problem of the interpretation of the quantum mechanical time-inverse temperature has apriori been resolved with a heuristic interpretation. As an epilogue, the Pauli theorem on time as an operator has been discussed along with the standard proof.
    Źródło:
    World Scientific News; 2016, 44; 236-256
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface Green’s function of a soft elastomer with the gravity effect
    Autorzy:
    Liang, Xiaodong
    Liu, Junxiu
    Xu, Peibao
    Li, Kai
    Powiązania:
    https://bibliotekanauki.pl/articles/280502.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    surface Green’s function
    gravity
    distributed pressure
    soft materials
    neo-Hookean model
    Opis:
    Gravity can play a tremendous effect on deformation of rubberlike materials and biological soft tissues. In this paper, considering the gravity effect, we proposed a surface Green’s function of a soft elastomer based on the neo-Hookean model. The proposed surface Green’s function is applied to analyze the elastic deformation of a soft elastomer subjected to uniform pressure. The surface normal displacement of the soft elastomer is calculated and the results show that gravity has a large impact on the surface deformation of the elastomer. Generally, the surface normal displacement decreases with the increasing gravitational force.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2020, 58, 1; 35-44
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wave propagation in 2D between two elastic media in contact in theory of generalized two temperature thermoelasticity with gravity effect
    Autorzy:
    Lotfy, Khaled
    Gabr, Mahmoud
    El-Bary, Alaa Abd
    Powiązania:
    https://bibliotekanauki.pl/articles/240130.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    generalized thermoelasticity
    surface waves
    two temperatures
    Lord-Shulman theory
    influence of gravity
    Opis:
    The theory of generalized two-temperature thermoelasticity is used to solve the boundary value problems between two elastic media with two different types of temprature under the influence of gravity.The classical dynamical coupled theory and Lord-Şhulman theory are used to obtain the general solution of the governing equations and investigate the effect of surface waves in an isotropic elastic medium subjected to gravity field. The harmonic vibrations method is used to obtain the displacement components, stress tensor and temperature distribution in the considerd physical domain with comparison with the two theories. The obtained analytic solution of the problem is applied for special cases for which the effect of two temperatures is studied. The conductive and dynamical temperatures as well as stress and strain components are shown graphically for a suitable material. Some comparisons are also introduced in the absence and in the presence of gravity, and two-temperature parameter. The differences in the obtained results between the two theories are considered.
    Źródło:
    Archives of Thermodynamics; 2020, 41, 1; 219-243
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Incompressible SPH Model for Simulating Violent Free-Surface Fluid Flows
    Autorzy:
    Staroszczyk, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/241132.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    gravity water wave
    free surface
    incompressible flow
    Lagrangian description
    smoothed particle hydrodynamics
    Opis:
    In this paper the problem of transient gravitational wave propagation in a viscous incompressible fluid is considered, with a focus on flows with fast-moving free surfaces. The governing equations of the problem are solved by the smoothed particle hydrodynamics method (SPH). In order to impose the incompressibility constraint on the fluid motion, the so-called projection method is applied in which the discrete SPH equations are integrated in time by using a fractional-step technique. Numerical performance of the proposed model has been assessed by comparing its results with experimental data and with results obtained by a standard (weakly compressible) version of the SPH approach. For this purpose, a plane dam-break flow problem is simulated, in order to investigate the formation and propagation of a wave generated by a sudden collapse of a water column initially contained in a rectangular tank, as well as the impact of such a wave on a rigid vertical wall. The results of simulations show the evolution of the free surface of water, the variation of velocity and pressure fields in the fluid, and the time history of pressures exerted by an impacting wave on a wall.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2014, 61, 1-2; 61-83
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polycyclic aromatic hydrocarbons (PAH) in gravity-operated and surface water from areas located nearby coking plant in Dąbrowa Górnicza (Upper Silesia region, Poland)
    Wielopierścieniowe węglowodory aromatyczne (WWA) w wodach opadowych i powierzchniowych w rejonie zakładów koksowniczych w Dąbrowie Górniczej (woj. śląskie)
    Autorzy:
    Kuna, P.
    Gwoździewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/395813.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    wielopierścieniowe węglowodory aromatyczne (WWA)
    wody opadowe
    wody powierzchniowe
    zanieczyszczenia WWA
    PAH
    gravity-operated water
    surface water
    Opis:
    The paper presents the results of five PAHs contents determination in the surface and gravity-operated water. The samples of gravity-operated water were taken quarterly in 2009 from collectors put in fifteen points in areas located nearby coking plant in Dąbrowa Górnicza (Upper Silesia region, Poland). The results allowed determining the seasonal variability of PAHs concentration in gravity-operated water. Significant differences in concentration of PAHs in the summer and wintertime were observed. Moreover, to check the presence of PAHs contamination in the surface flowing water from selected streams, watercourses and draining system were collected.
    W pracy przedstawiono wyniki badań zawartości pięciu WWA w próbkach wód opadowych i powierzchniowych. Próbki wód opadowych pobierano kwartalnie w 2009 roku z 15 kolektorów umieszczonych na terenach zlokalizowanych w pobliżu zakładów koksowniczych w Dąbrowie Górniczej (woj. śląskie). Uzyskane wyniki pozwoliły określić zmienność sezonową stężeń WWA w wodach opadowych. Wyraźnie podwyższone stężenia WWA zaobserwowano w sezonie zimowym. Ponadto, w celu sprawdzenia obecności zanieczyszczeń WWA w wodach powierzchniowych, przebadano próbki wód (płynących) powierzchniowych pobranych z wybranych potoków, cieków wodnych oraz rowów melioracyjnych.
    Źródło:
    Civil and Environmental Engineering Reports; 2010, 5; 251-262
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface waves in fibre-reinforced anisotropic solid elastic media under the influence of gravity
    Autorzy:
    Sethi, M.
    Gupta, K. C.
    Gupta, D.
    Manisha, -
    Powiązania:
    https://bibliotekanauki.pl/articles/955330.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    fale powierzchniowe
    lepkość
    fala Rayleigha
    siła ciężkości
    fibre-reinforced medium
    surface waves
    viscosity
    Rayleigh waves
    gravity
    Opis:
    The aim of the present paper is to investigate surface waves in an anisotropic, elastic solid medium under the influence of gravity. First, a theory of generalised surface waves was developed and then it was employed to investigate particular cases of waves, viz., Stoneley and Rayleigh, Love type. The wave velocity equations were obtained for different cases and they are in well agreement with the corresponding classical result, when the effect of gravity, viscosity as well as parameters for fibre-reinforcement of the material medium are ignored.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2013, 18, 1; 177-188
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reconsidering the glaciogenic origin of Gondwana diamictites of the Dwyka Group, South Africa
    Autorzy:
    Molén, Mats O.
    Smit, J. Johan
    Powiązania:
    https://bibliotekanauki.pl/articles/2204360.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    surface microtexture
    sediment gravity flows
    Late Palaeozoic Ice Age
    pavement
    Nooitgedacht
    mikrotekstura powierzchni
    osad
    epoka lodowcowa
    nawierzchnie
    Opis:
    The Gondwana Late Palaeozoic Ice Age is probably best represented by the Dwyka Group in South Africa. Striated and grooved surfaces or pavements are commonly considered to have formed subglacially, as are diamictites which have been interpreted as in-situ or reworked tillites. These interpretations were tested by investigation of outcrops in formerly well-studied areas, throughout South Africa. Detailed analyses have focused on striated surfaces/pavements and surface microtextures on quartz sand grains in diamictites. The sedimentological context of four pavements, interpreter to be glaciogenic, display features commonly associated with sediment gravity flows, rather than glaciation. A total of 4,271 quartz sand grains were subsampled from outcrops that are considered mainly to be tillites formed by Continental glaciation. These grains, analysed by SEM, do not demonstrate the characteristic surface microtexture combinations of fracturing and irregular abrasion associated with Quaternary glacial deposits, but mainly a mix of surface microtextures associated with multicyclical grains. The Dwyka Group diamictites warrant reinterpretation as non-glacial sediment gravity flow deposits.
    Źródło:
    Geologos; 2022, 28, 2; 83--113
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of signals of the range 10-3 - 10-4 Hz registered by water-tube tiltmeters in the underground geodynamic laboratory in Książ (SW Poland)
    Autorzy:
    Kaczorowski, Marek
    Kasza, Damian
    Zdunek, Ryszard
    Wronowski, Roman
    Powiązania:
    https://bibliotekanauki.pl/articles/2174941.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Centrum Badań Kosmicznych PAN
    Tematy:
    interferometry
    time series analysis
    tides
    planetary waves
    acoustic gravity waves
    surface waves
    free oscillations
    ionosphere interactions
    atmosphere interactions
    Opis:
    The Geodynamic Laboratory in Książ includes investigations of various kinds of geodynamic signals. Among others, we registered harmonic signals of the range 10-3 - 10-4 Hz. These signals had been found in the measurement series of the long water-tube (WT) tiltmeters. The discovered signals consist of two classes of harmonics associated with various kinds of phenomena. The first class of these signals belongs to viscoelastic vibrations of the Earth’s solid body, while the second class is produced possibly by the extremely long atmospheric infrasound waves. The signals of the vibrations of the Earth had been well recognized by the characteristic frequencies of the Earth’s free vibrations’ resonance, which occur mainly after strong earthquakes. The atmospheric pressure microvibrations affected the water level in the hydrodynamic systems of the WTs as a result of an inverse barometric effect. We observed that signals from both classes blend in the harmonics of similar frequencies and jointly affect the hydrodynamic systems of the WTs. We found that the amplitude of the secondclass signals strongly depends on the location of water-tube gauges inside the underground, while the amplitudes of the first-class signals are similar for all the gauges. These observations clearly indicate the atmospheric origin of the second class of registered signals.
    Źródło:
    Artificial Satellites. Journal of Planetary Geodesy; 2022, 57, 4; 210--236
    2083-6104
    Pojawia się w:
    Artificial Satellites. Journal of Planetary Geodesy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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