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    Wyświetlanie 1-8 z 8
    Tytuł:
    Polytropic Tachyon Scalar Field Model in 5-dimensional Universe
    Autorzy:
    Korunur, M.
    Salti, M.
    Aydogdu, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1076550.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Extra dimension
    cosmology
    dark energy
    scalar field
    Opis:
    Recent astrophysical observations show that the universe has entered a late-time accelerated expansion period. It is commonly accepted that the dark energy is responsible for this enigmatic behavior of our universe, because it makes up about 70 percent of the content of our universe and dominates over the matter part. Therefore, the dark energy will govern the speedy enlargement and determine the fate of our universe. Another interpretation of the dark energy is that this is a new kind of dynamical field or fluid, something mysterious which fills all of space but something whose influence on the accelerated enlargement nature of our universe is the opposite of that of baryonic matter and ordinary energy. Here, we focus on the polytropic gas unified dark matter-energy model in a 5-dimensional cosmology to reconstruct tachyonic scalar field proposal of the dark energy. It is known that the background dynamics of the polytropic gas is equivalent to that one for the dark energy interacting with the dark matter. On the other hand, using scalar field is one of the most significant methods helping us to understand the dark universe. There are many scalar field proposals, but generally it is hard to get exact relations for the scalar field function and its self-interacting potential. In this work, making use of the 5-dimensional Polytropic gas model, we calculate exact relations for the tachyonic scalar field. After that, we discuss our theoretical calculations graphically in order to interpret our theoretical results in a different way.
    Źródło:
    World Scientific News; 2019, 115; 138-148
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic Quantum Vacuum and Relativity
    Autorzy:
    Fiscaletti, Davide
    Powiązania:
    https://bibliotekanauki.pl/articles/763387.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
    Tematy:
    energy density of quantum vacuum, Sagnac effect, relativity, dark energy, Mercury precession.
    Opis:
    A model of a three-dimensional dynamic quantum vacuum with variable energy density is proposed. In this model, time we measure with clocks is only a mathematical parameter of changes running in quantum vacuum. Mass and gravity are carried by the variable energy density of quantum vacuum. Each elementary particle is a structure of quantum vacuum and diminishes the quantum vacuum energy density. Symmetry “particle – diminished energy density of quantum vacuum” is the fundamental symmetry of the universe which gives origin to the inertial and gravitational mass. Special relativity’s Sagnac effect in GPS system and important predictions of general relativity such as precessions of the planets, the Shapiro time delay of light signals in a gravitational field and the geodetic and frame-dragging effects recently tested by Gravity Probe B, have origin in the dynamics of the quantum vacuum which rotates with the earth.
    Źródło:
    Annales Universitatis Mariae Curie-Skłodowska, sectio AAA – Physica; 2016, 71
    0137-6861
    Pojawia się w:
    Annales Universitatis Mariae Curie-Skłodowska, sectio AAA – Physica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Equalized mass can explain the dark energy or missing mass problem as higher density of matter in stars amplifies their attraction
    Autorzy:
    Czajko, Jakub
    Powiązania:
    https://bibliotekanauki.pl/articles/1179255.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Equalized mass; complete total potential energy; dark matter/energy; missing mass
    Opis:
    In order to compare properties of celestial bodies regardless of their motions, their masses, which represent also their energy spent on resistance to forced motions, should be expressed with respect to the same (for all of them) material substance, such as water, for instance. Then their density of matter, which has been defined as the ratio of their actual mass/bulk to an equivalent mass of water, should also be taken into account even in the radial Newtonian law of gravitation. Such an equalized mass adheres to the Newton’s definition of “quantity of matter” as conjoined feature (i.e. product) of matter density and the bulk=mass of the body, even though he has never really operated on the notion so defined. The equalized mass conforms to the Einstein’s concept of mass as equivalent of energy, both of which vary with speed. Hence the product of equalized mass and density of matter can increase the radial gravitational force of very dense stars, easing the problem of the allegedly missing mass that pushes galaxies too far away according to former estimates of their masses and their distances. Besides the equalized mass, the need for which has emerged from presence of nonradial potentials acting along paths on equipotential surfaces in radial/center-bound force fields, the repulsive effects of the nonradial angular potentials can also amplify the regular/innate spins of stars, black holes and galaxies, eliminating thus the need for the so-called dark matter/energy invented just to explain the allegedly missing mass/energy.
    Źródło:
    World Scientific News; 2017, 80; 207-238
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antimatter in Hidden Dimensions: A Possible Origin of Dark Energy
    Autorzy:
    Reza, Moonzarin
    Sarker, Sihab Uddin Mahtab
    Powiązania:
    https://bibliotekanauki.pl/articles/1076393.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Accelerated Cosmic Expansion
    Anti-matter
    Dark energy
    Strong Nuclear force
    Unobserved Dimensions
    Opis:
    This paper presents a possible origin of dark energy, which is believed to be the cause of accelerated expansion rate of the cosmos with the aid of superstring theory and the observed matter-antimatter asymmetry. It proposes a model in which the antimatter, and particularly antiquarks, occupies the Calabi-Yau manifold in six dimensions and thus attracts the quarks via ‘gluons’. This phenomenon creates an illusionary vision. This paper also provides a conceivable explanation of the observed matter-antimatter asymmetry in the visible universe.
    Źródło:
    World Scientific News; 2019, 116; 238-244
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Time at the Level of a High Speed Moving Object
    Autorzy:
    Spacey, John
    Powiązania:
    https://bibliotekanauki.pl/articles/1193284.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    General Relativity
    Quantum Mechanics
    astronomy
    astrophysics
    black-hole
    cosmology
    dark Matter and dark Energy
    galaxies
    gravity
    negative space-time
    Opis:
    I think that far-away travels into Space are possible in the way that it is possible to find again people on our Earth, after the return of a very long travel into Space, not aged, like the people who have traveled inside the spacecraft. Current physics does not allow this and I have developed the following Theory which would thus complement the current Theory of General Relativity when we go to the limits of the reasoning. Current Theories like General Relativity or Quantum Mechanics are not impacted when the reasoning is not pushed to the limits. My reasoning at the limits just complements current Theories when the parameters take extreme values and thus the logic of current physics is respected.
    Źródło:
    World Scientific News; 2021, 153, 1; 1-42
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Current State, Challenges and Perspectives of Biological Production of Hydrogen in Dark Fermentation Process in Poland
    Autorzy:
    Kozłowski, Kamil
    Lewicki, Andrzej
    Malińska, Krystyna
    Wei, Qiao
    Powiązania:
    https://bibliotekanauki.pl/articles/124446.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    renewable energy sources
    biohydrogen
    dark fermentation
    wastes management
    biogas plants
    Opis:
    The increasing demand for electrical energy and environmental concerns associated with conventional means of its generation drive the interest in alternative fuels. Biohydrogen, widely considered as fuel of the future, is one of such alternatives. To date, research results suggest that biological routes are the most promising for hydrogen production, especially dark (hydrogen) fermentation. Hydrogen fermentation can be performed with agricultural and food processing wastes as substrates. In this paper the most important factors influencing dark fermentation are reviewed and analyzed. These are: pH, partial pressure, temperature, and retention time. The biohydrogen generation efficiency is also presented with respect to different substrates. It should be also pointed out that many factors are still unknown; thus, the process requires conducting further research.
    Źródło:
    Journal of Ecological Engineering; 2019, 20, 2; 146-160
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quantitative Support for Borowski’s Theory of Gravitation
    Autorzy:
    Persinger, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/412484.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Dark matter
    gravitation
    quantitative solutions
    final epoch
    planetary motions
    space-energy relations
    Opis:
    The Borowski Theory of Gravitation (BTG) indicates that movements of mass such as planets through space are determined by differential pressures from dark matter. One of the consequences of the final epoch is that there would be no matter but only distance. Quantitative solutions indicate that the tensor to set universal average dark matter pressure equal to G, the gravitational constant, would require that the terminal length would be ~2.2∙1069 m or effectively identical to current estimates of energy equivalence of the universal mass. For the earth’s orbit the force from the dark pressure is the same order of magnitude as the force associated with the product of the planet’s mass and background free oscillations whose origins are still ambiguous. The convergences of solutions suggest that the BTG may reveal alternative interpretations and mechanisms for the role of gravitation in planetary motion.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 12; 67-71
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Different types of energy conversion for biohydrogen production processes
    Sposoby konwersji energii do produkcji wodoru z wykorzystaniem procesów biochemicznych
    Autorzy:
    Kuzminskiy, Y.
    Shchurska, K.
    Samarukha, I.
    Łagód, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/126664.pdf
    Data publikacji:
    2011
    Wydawca:
    Towarzystwo Chemii i Inżynierii Ekologicznej
    Tematy:
    biohydrogen
    biophotolysis
    dark fermentation
    energy conversion efficiency
    biofuel
    microbial fuel cells
    electrochemically active microorganisms
    wodór
    biofotoliza
    wydajność energetyczna
    biopaliwa
    mikroorganizmy aktywne elektrochemicznie
    Opis:
    Increased environmental problems as well as growing fuel and energy demand encourage the international community to effectively search for new energy technologies that would ensure an acceptable level of pollution and, simultaneously, would not limit economical growth. The key position in solving this problem is occupied by hydrogen energy, ie hydrogen production and use of fuel cells in industry, construction, transportation, housing and other sectors of the economy. So it is possible to say that hydrogen becomes a promising alternative energy carrier to fossil fuels, since it is clean, renewable, contains high energy content and does not contribute to greenhouse effect. Biological hydrogen production is one of the most challenging areas of technology development for sustainable generation of gaseous energy. The present study critically updates various biohydrogenation processes with special references to their advantages and disadvantages. Different approaches towards improvement of the bioprocesses are also outlined. The presented study reviews biohydrogen systems, molecular and genetic aspects of hydrogen production and technologies of biohydrogen production.
    Narastające problemy środowiskowe, a także wzrastające zapotrzebowanie na energię oraz jej nośniki w postaci paliw zmuszają do wzmożonych badań nad nowymi technologiami energetycznymi. Technologie takie z jednej strony powinny zapewnić akceptowalny poziom emisji zanieczyszczeń, z drugiej zaś nie ograniczać jednocześnie wzrostu ekonomicznego. Jednym z kluczowych sposobów rozwiązania problemów energetycznych wydaje się wykorzystanie wodoru jako nośnika energii. W powiązaniu z tym zagadnieniem rozważane są kwestie odnoszące się do produkcji wodoru oraz wykorzystania zawierających go ogniw paliwowych w przemyśle, budownictwie, transporcie, gospodarstwach domowych oraz wielu innych sektorach gospodarki. Wodór staje się obiecującym alternatywnym nośnikiem energii, zdolnym w przyszłości zastąpić paliwa kopalne z uwagi na swój wysoki potencjał energetyczny, odnawialność oraz „czystość” generowanej energii, której wykorzystanie nie powoduje efektu cieplarnianego. Produkcja wodoru za pomocą metod biologicznych jest jednym z obszarów rozwoju technologii, szczególnie ważnym w kontekście zrównoważonej produkcji energii. Prezentowane opracowanie zawiera przegląd ważniejszych metod i procesów biologicznych, umożliwiających produkcję wodoru, korzystających z różnych mechanizmów konwersji energii. W pracy przedstawiono różne podejścia mające na celu udoskonalenie wspomnianych biotechnologii, omówiono również molekularne i genetyczne aspekty produkcji wodoru.
    Źródło:
    Proceedings of ECOpole; 2011, 5, 2; 389-394
    1898-617X
    2084-4557
    Pojawia się w:
    Proceedings of ECOpole
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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