Temat: 45.05.+x - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Determining Parameters of an RLC Circuit Response to a Single Pulse
Autorzy:: Ozga, A.
Tematy:: 45.05.+x
45.05.+e; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1400081.pdf Link otwiera się w nowym oknie
Opis:: Experimental determining of distributions of pulses forcing a linear system, where pulse amplitudes and occurrence instants are random values, is burdened with errors resulting from uncertainty of the measurement and the differences between the model and the physical phenomenon. The objective of this work is an attempt to minimize these errors through application of an approximation algorithm that allows to determine parameters of response of the system to a single pulse forcing. The conclusions issuing from the investigations indicate that the parameters of the vibrating system should be selected so that the impact of the local deformations that occur while the system is being forced on the parameters of the system response should be as small as possible.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Distribution of Random Pulses Forcing a Damped Oscillator Determined in a Finite Time Interval
Autorzy:: Ozga, A.
Tematy:: 45.05.+x
45.30.+s
45.90.+; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1196915.pdf Link otwiera się w nowym oknie
Opis:: Solving a stochastic problem for systems subjected to random series of pulses is, in the present case, aimed at determining of an approximate distribution of amplitudes of random pulses forcing vibrations of an oscillator with damping. The applied model of investigations indicated the source of difficulties connected with interpretation of the obtained results. Another issue discussed in the paper is how a change of the damping coefficient b of the system may result in a decrease of the difference between the actual distribution of random pulses and that determined from the waveform.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The Effect of Pulse Amplitudes on Quality of Determining Distribution of Pulses Forcing Vibration of an Damped Oscillator
Autorzy:: Ozga, A.
Tematy:: 45.05.+x
45.30.+s
45.90.+t; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1402185.pdf Link otwiera się w nowym oknie
Opis:: The paper presents another phase of the study aimed at determining distributions of random pulses forcing vibration of an oscillator with damping. At this stage, the impact of the pulses amplitudes on distributions determined in a finite time interval is discussed. Application of a mathematical model in simulations allows to determine the differences between the distributions generated in MATLAB environment and those determined by a function. The experiment was designed so that the qualitative analysis of the issue was possible.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 4.

Tytuł:: Perturbation to Noether Symmetry and Noether Adiabatic Invariants of Discrete Difference Variational Hamilton Systems
Autorzy:: Zhang, M.
Fang, J.
Tematy:: 02.20.Sv
11.30.-j
45.05.+x; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1419663.pdf Link otwiera się w nowym oknie
Opis:: The perturbation to the Noether symmetry and the Noether adiabatic invariants of discrete difference variational Hamilton systems are investigated. The discrete the Noether exact invariant induced directly by the the Noether symmetry of the system without perturbation is given. The concept of discrete high-order adiabatic invariant is presented, the criterion of the perturbation to the Noether symmetry is established, and the discrete the Noether adiabatic invariant induced directly by the perturbation to the Noether symmetry is obtained. Lastly, an example is discussed to illustrate the application of the results.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Ground-State Configurations of 2D Clusters of Classical Charged Particles
Autorzy:: Sobczak, P.
Kamieniarz, G.
Tematy:: 68.65.-k
45.05.+x
52.27.Lw; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1813816.pdf Link otwiera się w nowym oknie
Opis:: The ground-state configurations of the classical point-charge particles were calculated using a new genetic-algorithm-based approach. The structures obtained confirmed the recent Monte Carlo findings, including the metastable states.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Perturbation to Symmetry and Adiabatic Invariants of General Discrete Holonomic Dynamical Systems
Autorzy:: Wang, P.
Zhu, H.
Tematy:: 02.20.Sv
11.30.-j
45.05.+x; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1505326.pdf Link otwiera się w nowym oknie
Opis:: This paper investigates perturbation to the Noether symmetry of discrete holonomic nonconservative dynamical systems on a uniform lattice. Firstly, we give the Noether theorem of system. Secondly, both criterion of perturbation to the Noether symmetry and the Noether adiabatic invariants of system are obtained. Finally, an example is given to illustrate these results.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 7.

Tytuł:: Structure and magnetic properties of Fe-B-Si-Zr metallic glasses
Autorzy:: Babilas, R.
Radoń, A.
Gębara, P.
Tematy:: 33.45.+x
61.05.cp
64.70.pe
75.50.Kj; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1054824.pdf Link otwiera się w nowym oknie
Opis:: Fe-based amorphous alloys were characterized by X-ray diffraction, transmission Mössbauer spectroscopy and vibrating sample magnetometry. The studies were performed on (Fe_{0.75}B_{0.15}Si_{0.1})_{100-x}Zr_{x} (x=0, 1, 3) metallic glasses in the form of ribbons. The glassy samples were prepared by the "melt spinning" technique in argon protective atmosphere. The XRD patterns show the broad diffraction halo that is typical for amorphous Fe-based alloys. The Mössbauer spectroscopy allows to study the local environments of the Fe atoms in the glassy state, showing the changes in the amorphous structure due to the changing of Zr addition. From hysteresis loops obtained from vibrating sample magnetometry measurements, coercive force and saturation magnetization were determined versus different Zr content. The obtained magnetic properties allow to classify the studied amorphous alloys in as-cast state as soft magnetic materials.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Impact of Scaling Range on the Effectiveness of Detrending Methods
Autorzy:: Grech, D.
Mazur, Z.
Tematy:: 05.45.Tp
89.75.Da
02.60.-x
89.20.-a; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1388429.pdf Link otwiera się w nowym oknie
Opis:: We make the comparative study of scaling range properties for detrended fluctuation analysis (DFA), detrended moving average analysis (DMA) and recently proposed new technique called modified detrended moving average analysis (MDMA). Basic properties of scaling ranges for these techniques are reviewed. The efficiency and exactness of all three methods towards proper determination of scaling Hurst exponent H is discussed, particularly for short series of uncorrelated and persistent data.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: B-Spline Solution and the Chaotic Dynamics of Troeschs Problem
Autorzy:: Caglar, H.
Caglar, N.
Ozer, M.
Tematy:: 05.45.Pq
02.60.-x
02.60.Lj; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1291812.pdf Link otwiera się w nowym oknie
Opis:: A B-spline method is presented for solving the Troesch problem. The numerical approximations to the solution are calculated and then their behavior is studied and commenced. The chaotic dynamics exhibited by the solutions of Troesch's problem as they were derived by the decomposition method approximation are examined and an approximate critical value for the parameter λ is introduced also in this study. For the parameter value slightly less than λ ≈ 2.2, the solutions begin to show successive bifurcations, finally entering chaotic regimes at higher λ values. The effectiveness and accuracy of the B-spline method is verified for different values of the parameter, below its critical value, where the first bifurcation occurs.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Magnetic Properties and Structure after Crystallization of $Fe_{80-x}B_{20}Nb_{x}$ (x=4, 6, 10) Metallic Glasses
Autorzy:: Nowosielski, R.
Kądziołka-Gaweł, M.
Gębara, P.
Szyba, D.
Babilas, R.
Tematy:: 33.45.+x
61.05.cp
64.70.pe
75.50.Kj; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1398320.pdf Link otwiera się w nowym oknie
Opis:: The ferromagnetic Fe-based amorphous alloys were studied due to properties for soft magnetic applications. Depending on different Nb addition, the formation of crystalline phases after annealing of amorphous $Fe_{80-x}B_{20}Nb_{x}$ (x = 4,6,10) alloys was studied. The crystallization products as well as the phase structure were determined using the Mössbauer spectrometry combined with differential scanning calorimetry and magnetic measurements. The addition of Nb caused a shift of crystallization process towards higher temperatures and induced changes in coercive force and decreased the saturation magnetization. It was found that Nb addition changed the crystallization process from single crystallization for Fe₇₆B₂₀Nb₄ alloy to binary crystallization in the Fe₇₄B₂₀Nb₆ and Fe₇₀B₂₀Nb₁₀ glasses. The annealing process at the onset crystallization temperature induced complex phase formation including the α-Fe, Fe₃B, and Fe₂B phases for alloys x=4, 6.
Dostawca treści:: Biblioteka Nauki

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