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Wyszukujesz frazę "waves energy" wg kryterium: Temat

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    Wyświetlanie 1-11 z 11
    Tytuł:
    An overview of methods for wave energy conversion
    Autorzy:
    Chybowski, L.
    Kuźniewski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/135470.pdf
    Data publikacji:
    2015
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    sea waves
    energy conversion
    renewable energy
    waves energy
    seas and oceans
    power plants
    Opis:
    Legal and economic aspects connected with generating electricity from waves are discussed and a classification of wave energy converters is shown. The study discusses selected technical solutions generating electricity from sea and ocean waves. Research directions of the Maritime University of Szczecin, Poland, are presented in terms of energy conversion from wave energy into electricity and using sea wave energy for coast protection against waves. The potential of waves as a renewable energy source (in Europe and outside) is evaluated and problems connected with implementing wave energy conversion systems are outlined.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 41 (113); 17-23
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sea wave energy converter - WAVE DRAGON MW for few megawatts power range
    Przekształtnik energii fal morskich MW WAVE Dragon na poziomie mocy w zakresie kilku megawatów
    Autorzy:
    Kaźmierkowski, M.
    Jasiński, M.
    Malinowski, M.
    Płatek, T.
    Styński, S.
    Antoniewicz, P.
    Kołomyjski, W.
    Świerczyński, D.
    Soerensen, H. C.
    Friis-Madsen, E.
    Christiansen, L.
    Knapp, W.
    Zhou, Z.
    Igic, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/159473.pdf
    Data publikacji:
    2007
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
    Tematy:
    energia odnawialna
    energia fal morskich
    przekształtnik energoelektroniczny
    generatory
    renewable energy
    energy from sea waves
    power electronics converters
    generators
    Opis:
    The paper has as an objective to combine and disseminate a brief knowledge on generators and power electronics for Wave Dragon MW (WDMW) Power Take Off system. Wave Dragon MW captures power from sea waves by means of low-head turbines and converts it into rotating mechanical power. In recent years because of energy saving problem on almost whole world power electronics and electric machines as well as renewable energy market has been intensively developed. Problems which can appear in conversion mechanical power to electrical power in WDMW can be expected to be similar as in wind turbine. Therefore, state of the art briefly can base on state of the art for wind turbines. However, subject of the mechanical energy conversion from sea waves to electrical energy is not well identified and further research should be curried out.
    Artykuł ma na celu zebranie i przedstawienie podstawowych informacji na temat przekształtnika energii fal morskich Wave Dragon MW (WDMW). Ponadto również wstępne wyniki symulacyjne zespołu generator-przekształtnik energoelektroniczny - sieć.
    Źródło:
    Prace Instytutu Elektrotechniki; 2007, 231; 5-16
    0032-6216
    Pojawia się w:
    Prace Instytutu Elektrotechniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    To the non-electromagnetic theory of light
    Autorzy:
    Etkin, V. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1179246.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Maxwell's equations
    electromagnetic waves
    light
    non-electromagnetic effects
    radiant energy
    rethinking
    Opis:
    It is shown that the thermodynamic form of the equations describing processes in current-carrying systems is more general than Maxwell's equations. The erroneousness of his concept of a single electromagnetic field has been revealed. On the basis of the thermodynamic derivation of the Maxwell equations proposed earlier in their field form, a critical analysis of the postulates laid down in the basis of its electromagnetic theory of light is given, and its internal and external inconsistency is revealed. Numerous experimental data are presented, which indicate the existence of non-electromagnetic radiation. The conclusion is made that the theory of Maxwell is essentially limited and that it is necessary to develop a more general concept of light based on the existence of non-baryonic matter with properties identical to the ether and free from the contradictions of the electromagnetic theory.
    Źródło:
    World Scientific News; 2017, 80; 143-157
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Basic of the graviacoustic light theory
    Autorzy:
    Etkin, V. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1178325.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Universe
    baryonic matter
    closed waves
    energy
    gravitational interaction
    levitation
    non-baryonic matter
    processes of structure formation
    radiation
    traveling waves
    Opis:
    A non-electromagnetic theory of light is proposed, according to which the light-bearing medium is non-baryonic (unstructured) matter as the main component of the substance of the universe. The theory is based on available data on the existence in the intergalactic medium of closed density waves, which are combined into structural elements (particles) of baryonic matter. On the basis of the principle of the equivalence of mass and energy, and also of the theory of waves, the basic relations between the parameters of non-baryonic matter are derived and the possibility of the appearance of running waves in it that make it visible is shown. The unity of the properties of non-baryonic matter with ether is emphasized, and the absence in the theory of contradictions inherent in the electromagnetic concept of light. Experimental evidence of the proposed theory is presented and new approaches to a number of difficultly explainable phenomena, including levitation, are discussed.
    Źródło:
    World Scientific News; 2017, 81, 2; 184-197
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamics of the FKT system with different mooring lines
    Autorzy:
    Wu, Jo-Ti
    Chen, Jiahn-Horng
    Hsin, Ching-Yeh
    Chiu, Forng-Chen
    Powiązania:
    https://bibliotekanauki.pl/articles/258986.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    ocean current energy
    floating turbine system
    mooring line
    system dynamics
    surface waves
    Opis:
    To harness the endless hydrokinetic energy of the Kuroshio current, the joint research team of the National Taiwan University and the National Taiwan Ocean University has developed a floating Kuroshio turbine (FKT) system in Taiwan. In normal operation, the system floats at a certain small depth from the ocean surface to reduce the wave effects and take advantage of faster current speeds. In the present study, the effect of the mooring line on the system dynamics is investigated computationally. Two different auxiliary mooring line designs and, for each design, three different common mooring lines (polyester ropes of neutral buoyancy, iron chains, and 6×19 wires ropes with wire core) are examined. The study makes use of several commercial and in-house packages, integrated to find various coefficients. It is found that the mooring line, the auxiliary mooring line design, and the gravity centre can have a significant effect on system fluctuations in normal operation if the combination of these factors is not properly matched.
    Źródło:
    Polish Maritime Research; 2019, 1; 20-29
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Complementary Wave Interpretation of the Dirac Equation
    Autorzy:
    Bulathsinghala, D. L.
    Wijewardena Gamalath, K. A. I. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/412244.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Dirac equation
    energy-momentum equation
    complementary waves
    uncertainty relation
    time's arrow
    four-vector
    Opis:
    The Dirac equation consistent with the principles of quantum mechanics and the special theory of relativity, introduces a set of matrices combined with the wave function of a particle in motion to give rise to the relativistic energy-momentum relation. In this paper a new hypothesis, the wave function of a particle in motion is associated with a pair of complementary waves is proposed. This hypothesis gives rise to the same relativistic energy-momentum relation and achieves results identical to those of Dirac. Additionally, both the energy-time and momentum-position uncertainty relations are derived from the complementary wave interpretation. How the complementary wave interpretation of the Dirac equation is related to the time-arrow and the four-vectors are also presented.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 9, 2; 103-115
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of the Crushed Ore Particles Density in the Pulp Flow Based on the Dynamic Effects of High-Energy Ultrasound
    Autorzy:
    Morkun, V.
    Morkun, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/176809.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    concentration
    high-energy ultrasound
    bulk-mode ultrasonic waves
    particle size distribution
    pulp characteristics
    Opis:
    The method of automatic measurement of the ore particles density in the pulp flow by measuring the amount of high-frequency volume ultrasonic oscillations attenuation, which have passed a fixed distance in the test medium under the influence of high-energy ultrasound dynamic effects is considered. The results of ultrasonic field parameters calculation and spatial simulation of high-energy ultrasound radiation pressure effect on the pulp flow, as well as the results of modeling the trajectory of ore particles displacement of three fractions in the pulp flow under the influence of high-energy ultrasound radiation pressure are presented.
    Źródło:
    Archives of Acoustics; 2018, 43, 1; 61-67
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Plane waves in thermo-viscoelastic material with voids under different theories of thermoelasticity
    Autorzy:
    Tomar, S. K.
    Goyal, N.
    Szekeres, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/264540.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    termolepkosprężystość
    fala
    prędkość fazowa
    energia
    thermo-visco-elasticity
    voids
    waves
    phase speed
    attenuation
    energy
    Opis:
    Propagation of time harmonic plane waves in an infinite thermo-viscoelastic material with voids has been investigated within the context of different theories of thermoelasticity. The equations of motion developed by Iesan [1] have been extended to incorporate the Lord-Shulman theory (LST) and Green-Lindsay theory (GLT) of thermoelasticity. It has been shown that there exist three coupled dilatational waves and an uncoupled shear wave propagating with distinct speeds. The presence of thermal, viscosity and voids parameters is responsible for the coupling among dilatational waves. All the existing waves are found to be dispersive and attenuated in nature. The phase speeds and attenuation coefficients of propagating waves are computed numerically for a copper material and compared under different theories of thermo-elasticity. The expressions of energies carried along each wave have also been derived. All the computed numerical results have been depicted through graphs. It is found that the influence of CT and GLT is almost same on wave propagation, while LST influences the wave propagation differently.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2019, 24, 3; 691-708
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Nearshore Mining Pits on Hydro- and Lithodynamics of a Dissipative Coastal Zone: Case Study of the Hel Peninsula (Poland)
    Autorzy:
    Ostrowski, R.
    Skaja, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/241297.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    cross-shore profile
    waves
    wave energy dissipation
    grain size
    bed shear stresses
    nearshore mining pits
    Opis:
    The paper deals with a sandy shore located on the open sea side of the Hel Peninsula in Poland (the south Baltic Sea coast). The study site displays a cross-shore profile that intensively dissipates wave energy, mostly due to breaking. The theoretical modelling of wave transformation at this site reveals specific distributions of wave heights and bed shear stresses. The sediment borrow areas, presently used and identified for future exploitation, are located inconveniently far from the periodically re-nourished shores. The paper presents the possibilities of dredging works in the coastal zone that would not disturb the natural nearshore motion of water and sediments. The results of the study can be helpful in formulating generic safety standards, at least with respect to dissipative shores of non-tidal or micro-tidal seas, like the Baltic Sea.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2016, 63, 4; 237-252
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy retrieval from sea waves
    Autorzy:
    Szelangiewicz, T.
    Żelazny, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/134954.pdf
    Data publikacji:
    2015
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    sea waves
    wave parameters
    wave energy
    converters wave parameters
    solid wave power plant
    floating wave power plant
    Opis:
    Seas and oceans occupy approx. 71% of the Earth. On their surface wave action of stronger or weaker magnitude can be observed throughout a major part of the year. Wind-generated wave action contains energy, which can be retrieved and used for electrical current production. The paper shows what energy is contained in wind-generated waves on various ocean areas, presents dynamics of water movement in a wave as well as several examples of calculation results of the velocity of water particles and hydrodynamic pressures occurring in a wave.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 41 (113); 30-34
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of extending hot weather periods on approach to floor construction in moderate climate residential buildings
    Wpływ przedłużających się okresów występowania wysokich temperatur letnich na podejście do projektowania podłogi na gruncie w budynkach mieszkalnych w krajach klimatu umiarkowanego
    Autorzy:
    Staszczuk, A.
    Kuczyński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/396336.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    climate changes
    heat waves
    heat insulation in the ground
    thermal insulation
    energy consumption
    cooling demand
    zmiany klimatu
    fale upałów
    izolacja ciepła w gruncie
    podłoga na gruncie
    zapotrzebowanie na chłód
    Opis:
    The effects of changes in Global climate on the prolonging time and the frequency of the periods of very high outside air temperature at summer were shown in the paper with particular emphasis on European moderate climate countries. In these countries, residential buildings, are usually equipped neither in air conditioning equipment, nor in ordinary window blinds. As the most promising solution it is suggested to resign completely or partially from ground slab thermal insulation, directly utilizing ground heat storage capacity. The paper includes detailed simulations on potential effect of various kind of floor construction and actions preventing high indoor air temperatures in building approach on air temperature inside the one-storey, passive residential buildings during consecutive days of very high outdoor temperature and total energy used yearly for additional heating and air conditioning.
    W artykule przedstawiono analizę wpływu wysokich temperatur zewnętrznych na kształtowanie się temperatur wewnątrz jednokondygnacyjnego budynku mieszkalnego, charakteryzującego się wysokim poziomem izolacyjności termicznej obudowy. W celu poprawy mikroklimatu pomieszczeń, autorzy proponują całkowitą bądź częściową rezygnację z izolacji termicznej podłóg na gruncie, wykorzystując pojemność cieplną gruntu jako naturalnego źródło chłodu. W artykule przedstawiono wyniki obliczeń numerycznych z zastosowaniem programu komputerowego WUFI®plus dla różnych wariantów izolacji termicznej podłogi na gruncie, jak również innych niż proponowane przez autorów, sposobów zapobiegania przegrzewaniu się budynków w okresie pojawiających się fal upałów. Dla każdego z wariantów przeprowadzono obliczenia temperatury wewnętrznej, strat ciepła do gruntu oraz zapotrzebowania na chłód.
    Źródło:
    Civil and Environmental Engineering Reports; 2016, No. 20(1); 159-170
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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