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    Wyświetlanie 1-11 z 11
    Tytuł:
    Simulation of Rotating Black Holes
    Autorzy:
    Vindana, W. M. H. P.
    Wijewardena Gamalath, K. A. I. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1158501.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Hawking radiation
    Hawking temperature
    Kerr black hole
    Kerr-Newman black hole
    entropy
    mass variation
    rotating black holes
    thermodynamic parameters
    Opis:
    Considering the analogy between classical thermodynamic parameters and black hole parameters, the four laws of thermodynamics are reinterpreted for Kerr and Kerr-Newman black holes. A simple model for the dynamic relationships was obtained by considering the surface area of the outer horizon of a Kerr and Kerr-Neumann black hole as the area of a perfect black body. Finding the conditions these black holes should satisfy, the equations were numerically solved and simulated for the Hawking temperature, Hawking radiation and entropy variations of Kerr and Kerr-Newman black holes. The Hawking temperature and Hawking radiation of a given rotating black hole drastically increases at the final stage of the black hole evaporation. In the meantime, the entropy of a rotating black hole drastically decreases through the time. The additional angular momentum and the charge effects gain high Hawking temperatures and high Hawking radiation values for the black holes while these effects reduce the entropy of the black holes.
    Źródło:
    World Scientific News; 2018, 114; 106-125
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of Primary Spectra of Particle Radiation from Black Holes
    Autorzy:
    Wijewardhana, C. N. T.
    Wijewardena Gamalath, K. A. I. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193473.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Hawking radiation
    Higgs boson emission
    Kerr black hole
    Planck mass
    Primary emission spectra
    Schwarzschild black hole
    W±
    Z0
    primordial black hole
    quark and gluon emission
    Opis:
    The instantaneous primary emission spectra of particles radiating from Schwarzschild black holes and maximally rotating Kerr black holes of masses 1013 – 1015 g were investigated and C code, BlackHawk was used for the simulations. From a Schwarzschild black hole of mass 3.53×1013 g, gluons had the lowest cutoff energy, 199 MeV. The emission spectra were dominated by coloured particles, quarks having with the highest overall emission rate, 2.826×1022 GeV-1s-1 at energy 1.205 GeV. The leptons e±, μ±, τ± showed similar variation in emission rates. The only particles emitted with energies below the rest mass of u quarks were neutrinos, photons, and e±. At greater particle energies (> ~ 2 GeV) the emission rates of all particles were almost equivalent. The emission of vector bosons, Z0 and W± were negligible and became significant when the mass reduced to ~1011 g and then gluons, W±, Z0 and photons were emitted similar to each other with a peak at energy, 280 GeV. The emitting rates of gluons, quarks, neutrinos, W±, e±, μ±, τ±, Z0, photons, and Higgs bosons are in decreasing order respectively. As the mass of the black hole is reduced to 1.06×108 g, quarks were emitted at the highest rate 2.826×1022 GeV-1s-1 at 4010 GeV peak energy and at energies between rest mass energy of Higgs boson and 1.25×105 GeV, the emission of Higgs bosons exceeded the emission of quarks. For maximally rotating Kerr black hole of mass 3.53×1013 g, W±, Z0 and Higgs boson were emitted at higher emission rates 1012 – 1015 GeV-1s-1 and for mass 1.06×108 g, the gluons had the highest overall emission rate at the peak energy. At extremely high energies, the gluon emission rates are less than the emission rates of Higgs bosons, quarks, neutrinos, and e±, μ±, τ±. The spin-dependent behaviour of spectra is also present.
    Źródło:
    World Scientific News; 2021, 158; 105-129
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficiency and Convergence of Bisection, Secant, and Newton Raphson Methods in Estimating Implied Volatility
    Autorzy:
    Mahrudinda, Mahrudinda
    Munandar, Devi
    Purwani, Sri
    Powiązania:
    https://bibliotekanauki.pl/articles/1193324.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Black-Scholes model
    Newton Raphson
    bisection
    secant
    volatility
    volatility implied
    Opis:
    This study aims to estimate volatility prices based on the black-Scholes model (BSM) function with research data taken during the COVID-19 pandemic. The estimates of the volatility values are obtained by using three numerical methods, namely the bisection, secant, and Newton Raphson methods. The numerical processes that produce some iteration results in the three methods are then analyzed and the best convergence is sought. As a result, Newton Raphson method produces the smallest number of iterations, which stops at the 3rd iteration and gets a volatility value of 0.500451 with an absolute error value of 0.000388. However, the method requires an initial approximation which lies only in two intervals on the axis σ which are close to the true root. Meanwhile, for the other two methods, namely Bisection and Secant, this limitation does not apply, as long as there is an interval that guarantees the existence of roots. In this case, bisection method requires11 iterations to converge with volatility value of 0.500342 and error value of 0.000878. Whereas secant method requires 4 iterations to converge with a volatility value of 0.500449 and error value of 1.68938E-05. This suggests, that in some cases the use of Newton method, should be initialized with the use of bisection or secant method, to ensure successful iteration and accelerate the rate of convergence.
    Źródło:
    World Scientific News; 2021, 153, 2; 157-168
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inventorization and Documentation of Herbal Black Salt Preparation by the Apatanese (Abo-Tani) of Apatani Valley in Lower Subansiri District of Arunachal Pradesh (India) using ‘Gonde Unio’ Plant (Ambrosia artemisiifolia L.---Asteraceae)
    Autorzy:
    Panda, Subhasis
    Roy, Priyankar
    Mahanty, Dibyendu S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1192672.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Herbal black salt
    Apatanese
    Apatani valley
    Lower Subansiri
    Arunachal Pradesh
    India
    Opis:
    During the course of field studies at different villages of Apatani valley in Lower Subansiri district of Arunachal Pradesh in November, 2014, first hand new information (Indigenous Traditional Knowledge) of several ethnomedicinal plants were gathered based on oral interviews by the elderly persons, local medicine men, field guides and forest guards belonging to the Apatanese tribe. Total 12 ancient villages (viz., Hong, Bamin-Michi, Mudang Tage, Hija, Hari, Sibey, Tajang, Bulla, Dutta, Bree, Lemba and Pariyami) in and around Hapoli and Ziro (Lower Subansiri district Head Quarter, often called as ‘Apatani valley’) were visited for the purpose of documentation of Indigenous Traditional Knowledge. As these villages dominate friendly Apatani tribes since time immemorial, so Ziro Valley and Hapoli and its surrounding villages are called Apatani valley. These Apatani group of villages are located at altitudes ranging from 2000-2200 m MSL. The Apatani valley has an area of 1058 Km2 of which about 32 Km2 is under agriculture and rest under forests, plantation and settlements (www.unesco.org/tentativelist/5893) indicating their direct dependency to utilize plant resources since time immemorial. During field visit to Kardo hill, authors noticed a piece of black-coloured coal-like material along with an unknown plant (Apatanese called ‘Gonde Unio’) held by an elderly Apatanese woman at Sibe village. She was trying to hide it at first, but after repeated request, she revealed the story of the preparation of herbal black salt from the whole plant of ‘Gonde Unio’. Tapyo (a herbal brownish salt) is very common to the Apatanese, but this black salt including it’s method of preparation and composition is almost different to that of Tapyo. Therefore, this finding is really an interesting ITK, never known to the civilized world except this work and hence this finding is documented here. After a critical study, the ‘Gonde Unio’ plant is identified as Ambrosia artemisiifolia L. (Asteraceae
    Źródło:
    World Scientific News; 2016, 47, 2; 254-266
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mellin transform in higher dimensions for the valuation of the European basket put option with multi-dividend paying stocks
    Autorzy:
    Sunday, Emmanuel Fadugba
    Powiązania:
    https://bibliotekanauki.pl/articles/1156232.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Dividend paying stock
    European basket option
    Generalized Black-Scholes equation
    Mellin transform
    Opis:
    Numerical approximations and analytical techniques have been proposed for the pricing of basket put option but there is no known integral equation for the valuation of European basket put option with multi-dividend yields. Mellin transform is useful when dealing with the unstable mathematical system. This paper presents the integral equation for the price of the European basket put option which pays multi-dividend yields by means of the Mellin transform in higher dimensions that enables option equations to be solved directly in terms of market prices rather than log-prices, providing a more natural setting to the problem of pricing. The expression for the integral equation for the valuation of the European basket put option was obtained by solving the multi-dimensional partial differential equation for the price of the option via the multi-dimensional Mellin transform. The analytical solution to the derived integral equation for the case of two-dividend paying stocks was obtained. Also the effect of the correlation coefficients on the price of the European basket put option was considered. A comparative study of the Mellin transform, Monte Carlo method and implied binomial model for the valuation of the option in the case of was considered. The numerical results showed that negatively correlated assets are more sensitive to correlation changes than positively correlated assets as shown in Tables 1 and 2. Also the numerical evaluation of our expression is more efficient and produces a comparable result than the other methods. Hence the Mellin transform is a good approach for the valuation of European basket put option with multi-dividend yields.
    Źródło:
    World Scientific News; 2018, 94, 2; 72-98
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effectivity of Solution Mangosteen Rind (Garciana mangostana) as Medicine for Black Tilapia Juvenile (Oreochromis niloticus Bleeker) when Infected by Aeromonas hydrophila
    Autorzy:
    Lili, Walim
    Gumilar, Resvi
    Nurhayati, Atikah
    Rosidah, Rosidah
    Powiązania:
    https://bibliotekanauki.pl/articles/1062740.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Aeromonas hydrophila
    Garciana mangostana
    Oreochromis niloticus
    Solution mangosteen rind
    black tilapia
    medicine
    Opis:
    Many tropical plants have interesting biological activities with potential therapeutic applications. Garcinia mangostana Linn. (GML) belongs to the family of Guttiferae and is named “the queen of fruits”. It is cultivated in the tropical rainforest of some Southeast Asian nations like Indonesia, Malaysia, Vietnam, Philippines, and Thailand. This research aims to determine the concentration of solution mangosteen rind (Garciana mangostana) which is the most effective to healing of black tilapia juvenile (Oreochromis niloticus Bleeker) when infected by A. hydrophila bacteria to produce the highest survival of black tilapia juvenile. This research used experimental method and experimental design by including a complete randomized design (CRD) with five treatments and three replications. The used treatment was soaking black tilapia juvenile for 24 hours in mangosteen rind. The sample infected by A. hydrophila bacteria as much as 0.1 mL/fish at concentration of 108 cfu/mL with intramuscular injection method was used. The concentrations of mangosteen rind solution were 0, 500, 600, 700, and 800 ppm. The parameters observed were clinical symtoms, fish response to feed, fish response to shock, recovery process, and water quality. Data of the clinical symtoms, response fish to feed, response fish to shock, recovery process and water quality were analysed descriptively, while the survival rate data of black tilapia juvenile were analysed using F test at 95% confidence level and continued with Duncan test. The results showed, the use of mangosteen rind solution with 600 ppm concentration was effective to treat tilapia juvenile which infected by A. hydrophila bacteria resulted in the fastest recovery on the third day and the highest survival rate of 91.76.
    Źródło:
    World Scientific News; 2019, 133; 56-70
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Food diversity and feeding preference of Black Molly (Poecilla sphenops (Valenciennes, 1846)), a common ornamental fish - A preliminary study
    Autorzy:
    Dasgupta, Mandakranta
    Sarkar, Gargi
    Bhowal, Ankur
    Kundu, Gautam
    Sadhukhan, Gobinda Chandra
    Karmakar, Debasish
    Powiązania:
    https://bibliotekanauki.pl/articles/1193629.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Black Molly
    Feeding behavior
    Fish egg
    Food preference
    Ornamental fish
    Poecilla sphenops
    Tenualosa
    Opis:
    Black mollies are one of the most popular ornamental fishes in the aquarium hobby. Most People have had at one time at least one of these gentle and attractive fishes in their fish tank. They are one of the most popular feeder fishes due to high growth rate, birth size, reproduction and brood number. During fish development, supply of suitable food during culture period is the most vital factor to achieve good growth ratio. Present study aims at unfolding the feeding preference of Black Molly for which eggs of Pomfret, Carp and Tenualosa sp. and semolina and poppy seeds were provided as food of animal and plant sources respectively. It was observed that food with more protein contents (i.e. food from animal sources) were mostly preferred by Black Molly. It is concluded that food from animal sources could be beneficial to get good growth and survival of Black Molly.
    Źródło:
    World Scientific News; 2017, 71; 139-143
    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:
    Alien ornamental fish, the black molly Poecilia sphenops (Valenciennes, 1846) (Poeciliidae) found in artificial lake in Warsaw, Central Poland
    Autorzy:
    Maciaszek, Rafał
    Sosnowski, Witold
    Marcinek, Dorota
    Powiązania:
    https://bibliotekanauki.pl/articles/1065337.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Poecilia sphenops
    Pole Mokotowskie park complex
    aquarium
    black molly
    green swordtail
    invasive species
    ornamental pet
    southern platyfish
    variatus platy
    Opis:
    This paper describes an introduction of aquarium ornamental fish, Poecilia sphenops, Valenciennes, 1846 (Poeciliidae) in an artificial water reservoir in Pole Mokotowskie park complex in Warsaw, Poland. Caught individuals have been identified and described. The finding is discussed with available literature describing introductions of alien species with aquaristical origin in Polish and European waters.
    Źródło:
    World Scientific News; 2019, 135; 294-298
    2392-2192
    Pojawia się w:
    World Scientific News
    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:
    Analysis of the anarchist and anti-colonial wave basing on the concept of the Four Waves of Terrorism by David Rapoport and selected political events
    Autorzy:
    Jach-Chrzaszcz, Artur
    Powiązania:
    https://bibliotekanauki.pl/articles/1178883.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Alexander II of Russia
    Black Hand
    Communism
    Consul Organization
    David Charles Rapoport
    Fascism
    Irish Citizen Army
    Iron Guard
    NSDAP
    Nazism
    Secret Army Organization
    Terrorism
    The Four Waves of Terrorism
    William McKinley
    Opis:
    This article presents the analysis of two initial terrorism waves proposed by an American professor, David Charles Rapoport. In the first part of the dissertation, the author is going to present issues connected with the impossibility of coining a universal definition of terrorism and postulates the need of examining the waves of terrorism. In the further part of the paper, the author presents his considerations based on selected political events which took part during two waves of terrorism. At the end, the author provides an answer to the question of what differences there were between terrorist actions before the First World War and during initial decades after its conclusion. Within the scope of the paper, references to current events strictly relating to security and methods used to deal with terrorist attacks are also provided.
    Źródło:
    World Scientific News; 2017, 89; 98-103
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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