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    Wyświetlanie 1-6 z 6
    Tytuł:
    Fusion: a General Framework for Hierarchical Tilings
    Autorzy:
    Frank, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1202975.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.44.Br
    02.40.Gh
    Opis:
    One well studied way to construct quasicrystalline tilings is via inflate-and-subdivide (a.k.a. substitution) rules. These produce self-similar tilings-the Penrose, octagonal, and pinwheel tilings are famous examples. We present a different model for generating hierarchical tilings we call "fusion rules". Inflate-and-subdivide rules are a special case of fusion rules, but general fusion rules are more flexible and allow for defects, changes in geometry, and even constrained randomness. A condition that produces homogeneous structures and a method for computing frequency for fusion tiling spaces are discussed.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 2; 461-466
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Commutative vs. Noncommutative Space Statistical Properties of Two-Dimensional Harmonic Oscillator in Magnetic Field
    Autorzy:
    Hassanabadi, H.
    Derakhshani, Z.
    Zarrinkamar, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398656.pdf
    Data publikacji:
    2016-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    02.40.Gh
    03.65.-w
    03.65.Ge
    03.65.Pm
    Opis:
    We consider the Schrödinger equation in presence of an external magnetic field in commutative and noncommutative spaces and by solving the equation in an exact analytical manner, report the statistical quantities of the system.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 1; 3-7
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hot Compression Test of Heat Resistant Steel
    Autorzy:
    Fedoriková, A.
    Kvačkaj, T.
    Kočiško, R.
    Bidulský, R.
    Petroušek, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032933.pdf
    Data publikacji:
    2017-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    81.40.Gh
    81.40.Np
    02.70.Dh
    Opis:
    This article deals with the analysis of formability of heat resistant steel type 9Cr-1Mo by physical laboratory simulation - hot compression test. The 9Cr-1Mo steel belongs to modern 9%Cr tempered martensitic steel for high-temperature applications in advanced thermal power plants. The shape of the sample was defined based on numerical simulations. The laboratory simulation of forming process called physical simulation - specifically hot compression test was realized in the temperature range from 500 to 950°C and total deformation in the range from 39 to 52%. Cracks formed during hot compression test in the notches are assessed. Subsequently, the relation between the compression temperature, strain, and crack length was defined. The suitable workability corresponds to the temperature range 650-900°C, it agrees with results of numerical simulations. At a temperature of 900°C there is marginal relative deformation without rupture ε =39.9%, which corresponds to the value according to simulations NCL criteria 0.501.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 5; 1340-1343
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Students t-Distribution versus Zeldovich-Kompaneets Solution of Diffusion Problem
    Autorzy:
    Wojnar, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1408916.pdf
    Data publikacji:
    2012-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    02.70.Rr
    05.40.Jc
    05.40.Fb
    89.65.Gh
    Opis:
    Student's t-distribution is compared to a solution of superdiffusion equation. This t-distribution is a continuous probability distribution that arises in the problem of estimating the mean of a normally distributed population when the sample size is small. Formally it can written in the form similar to the Gaussian distribution, in which, however, instead of usual exponential function, the so called K-exponential - a form of binomial distribution - appears. Similar binomial form has the Zeldovich-Kompaneets solution of nonlinear diffusion-like problems. A superdiffusion process, similar to a Zeldovich-Kompaneets heat conduction process, is defined by a nonlinear diffusion equation in which the diffusion coefficient takes the form $D=a(t)(1//f)^n$, where a=a(t) is an external time modulation, n is a positive constant, and f=f(x,t) is a solution to the nonlinear diffusion equation. It is also shown that a Zeldovich-Kompaneets solution still satisfies the superdiffusion equation if a=a(t) is replaced by the mean value of a. A solution to the superdiffusion equation is given. This may be useful in description of social, financial, and biological processes. In particular, the solution possesses a fat tail character that is similar to probability distributions observed at stock markets. The limitation of the analogy with the Student distribution is also indicated.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 2B; B-133-B-136
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic Structural and Topological Phase Transitions on the Warsaw Stock Exchange: A Phenomenological Approach
    Autorzy:
    Sienkiewicz, A.
    Gubiec, T.
    Kutner, R.
    Struzik, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400183.pdf
    Data publikacji:
    2013-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    89.65.Gh
    02.50.Ey
    02.50.Ga
    05.40.Fb
    02.30.Mv
    Opis:
    We study crash dynamics of the Warsaw Stock Exchange by using minimal spanning tree networks. We identify the transition of the complex network during its evolution from a (hierarchical) power law minimal spanning tree network - representing the stable state of Warsaw Stock Exchange before the recent worldwide financial crash, to a superstar-like (or superhub) minimal spanning tree network of the market decorated by a hierarchy of trees - an unstable, intermediate market state. Subsequently, we observe a transition from this complex tree to the topology of the (hierarchical) power law minimal spanning tree network decorated by several star-like trees or hubs - this structure and topology represent the Warsaw Stock Exchange after the worldwide financial crash, and can be considered to be an aftershock. Our results can serve as an empirical foundation for a future theory of dynamic structural and topological phase transitions on financial markets.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 3; 615-620
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Short Comprehensive Report on the Non-Brownian Stochastic Dynamics at Financial and Commodity Markets
    Autorzy:
    Ciepliński, T.
    Dominiczak, A.
    Kutner, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1408963.pdf
    Data publikacji:
    2012-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    89.20.-a
    89.65.Gh
    02.50.Ey
    02.50.Ga
    05.40.Fb
    Opis:
    In this work we empirically verify the generic breaking of the Central Limit Theorem on the financial and commodity markets. We analysed the distributions of log-returns for typical indices and price of gold, for increasing time horizons. We considered Random Coarse Graining Transformation of the Continuous-Time Random Walk model, which can represent the non-Gaussian price dynamics of underlying assets and the corresponding derivatives, e.g., various options or future contracts. We confirmed that empirical data and predictions of the model quite well agree.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 2B; B-24-B-27
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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