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    Wyświetlanie 1-13 z 13
    Tytuł:
    Lattice Dynamics of Noble Metals on Effective Three-Body Interaction
    Autorzy:
    Coelho, A. A.
    Shukla, M. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945409.pdf
    Data publikacji:
    1996-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.20.-e
    65.40.-f
    Opis:
    Quite recently we modified the original model of Sarkar et al. for cubic metals in extending the ion-ion interaction, ion-electron interaction and the introduction of crystal equilibrium condition. We applied our scheme to alkali metals. We studied here the lattice dynamics of noble metals on our approach by calculating phonon dispersion relations along the three principal symmetry directions, [ξ00], [ξξ0] and [ξξξ] and the (θ-T) curves of three noble metals: copper, silver and gold. We obtained reasonable agreement with the experimental findings.
    Źródło:
    Acta Physica Polonica A; 1996, 89, 5-6; 615-623
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lattice Dynamics of Alkali Metals in a Three-Body Interaction
    Autorzy:
    Coelho, A. A.
    Shukla, M. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1932113.pdf
    Data publikacji:
    1995-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    65.40.-f
    63.20.-e
    Opis:
    The original model of Das et al. is modified in extending the electron-ion interaction on a three-body forces and including the crystal equilibrium condition to reduce one independent parameter. We studied the phonon dispersion relations along the three principal symmetry directions i.e. [ξ,0,0], [ξ,ξ,0] and [ξ,ξ,ξ] and θ-T curves of alkali metals, Na, K, Rb, Cs and Li. There is close agreement between the computed results and the experimental observations.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 3; 599-609
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Specific Heat of (NH$\text{}_{2}$(CH$\text{}_{3}$)$\text{}_{2}$)$\text{}_{3}$Bi$\text{}_{2}$I$\text{}_{9}$
    Autorzy:
    Plackowski, T.
    Włosewicz, D.
    Tomaszewski, P. E.
    Baran, J.
    Marchewka, M. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1932127.pdf
    Data publikacji:
    1995-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.Kb
    65.40.-f
    Opis:
    The specific heat of title compound was measured by adiabatic calorimeter in the temperature range 80-315 K. The phase transitions at about 304, 285 and 235 K were confirmed. A new structural phase transition at about 125 K was observed as well as new anomaly on differential scanning calorimetry (DSC) curve at about 318 K. The peculiar multiple character of C, anomalies may be explained in terms of phase transitions or intermediate phases induced by impurities. The specific heat data are in agreement with the independent DSC measurements and with preliminary X-ray studies.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 3; 635-641
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Study of the Phase Transitions in Potassium Hydrogen Sulphate KHSO$\text{}_{4}$
    Autorzy:
    Tahoon, K. K.
    Abosehly, A. M.
    Abdel-Kader, M. M.
    El-Sharkawy, A. A.
    El-Mansi, F. M
    Powiązania:
    https://bibliotekanauki.pl/articles/1931565.pdf
    Data publikacji:
    1994-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    65.40.-f
    64.70.-p
    Opis:
    We report on some thermal properties (specific heat capacity C$\text{}_{p}$, thermal conductivity λ, and thermal diffusivity σ) in addition to the differential thermal analysis thermogram and thermogravimetric analysis for potassium hydrogen sulphate (KHS), KHSO$\text{}_{4}$. The accurate measurements of the above-mentioned parameters as functions of temperature revealed that the compound undergoes two structural phase transitions around 100°C and 175°C. It seems also likely that the compound behaves as a poorly conducting material and hence the maul mechanism of the heat transfer is due to phonons. The data are correlated to the crystal structure including the two different HSO¯$\text{}_{4}$ ions.
    Źródło:
    Acta Physica Polonica A; 1994, 86, 3; 349-355
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Layered Structure on the Lattice Heat Capacity of the Rare Earth Molybdates
    Autorzy:
    Feher, A.
    Stefányi, P.
    Orendáčová, A.
    Anders, E.
    Zvyagin, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1887811.pdf
    Data publikacji:
    1991-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    65.40.-f
    63.20.-e
    Opis:
    Temperature dependence of the heat capacity of layered rare earth molybdates was measured in the temperature range from 0.4 K to 23 K. It is shown that the temperature dependence of the lattice heat capacity can be described by the "T", where n ≠ 3. It is shown that differently from KDy(MoO$\text{}_{4}$)$\text{}_{2}$ and CsDyEu(MoO$\text{}_{4}$)$\text{}_{2}$ for CsDy(MoO$\text{}_{4}$)$\text{}_{2}$ and CsGd(MoO$\text{}_{4}$)$\text{}_{2}$ we obtained the temperature term with n < 3, which can be connected with the 2D behaviour, manifested also in the so-called membrane effect.
    Źródło:
    Acta Physica Polonica A; 1991, 79, 6; 861-867
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Study of the Electronic Structure of CrPt$\text{}_{3}$ Alloy by the LMTO Method
    Autorzy:
    Szajek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1924275.pdf
    Data publikacji:
    1992-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    65.40.-f
    71.10.+x
    74.20.Fg
    Opis:
    The ab initio self-consistent linear muffin-tin orbital calculations in the atomic sphere approximation have been performed for the ordered CrPt$\text{}_{3}$ (AuCu$\text{}_{3}$-type structure) alloy. The band structure and the densities of electronic states are presented. The para- and ferrimagnetic phases were considered. The spin-polarized calculations have confirmed the experimental observation of small antiparallel induced magnetic moment on a platinum atom.
    Źródło:
    Acta Physica Polonica A; 1992, 82, 6; 967-974
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vortex Stabilization of Market Equilibrium in Theory and in Practice of Economics
    Autorzy:
    Jakimowicz, A.
    Juzwiszyn, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1408997.pdf
    Data publikacji:
    2012-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    89.65.Gh
    45.40.-f
    47.32.C-
    Opis:
    Rotary movements of the object around the position of equilibrium is the most common type of dynamics in nature. The way of plotting trajectory resembles winding a line onto a cone of revolution or some other solid of revolution. The state of equilibrium, which is usually not reached by the system, is marked with the cone axis. The trajectory can move away from the state of equilibrium, or get closer to it. A similar behavior is observed in many two-dimensional economic models, both linear, and nonlinear. The simplest example is a linear cobweb model, where - depending on slopes of linear demand function and linear function of supply - price and quantity make a broken line with a growing, constant or decreasing amplitude around the equilibrium point. In nonlinear models, trajectories are more realistic. A natural space for exploring spiral trajectories is a three-dimensional space. Usually, it requires magnifying the model's dimension by one. Economic vortices are made up by economic vectors of three constituents. It may be price, quantity, and time. Apparently, flat zigzags that can be seen on two-dimensional graphs of cobweb models are orthogonal projections of spinning trajectories. Vortexes created by nonlinear models are much smoother than the vortices created by linear models. The real economic vectors create smooth spiral trajectories, which indicates necessity to employ nonlinear dynamics in economic modeling. The basis for rotary movements are surface areas of solids of revolution of the second degree. The kinematics of solids indicated by market shows that they also rotate in three-dimensional space. It resembles precession movements. In economic dynamics we have at least a double rotation. What rotates are both economic vectors as well as the solids created by them.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 2B; B-54-B-60
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analytical Determination of the PZTs Distribution in Active Beam Vibration Protection Problem
    Autorzy:
    Brański, A.
    Lipiński, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1504198.pdf
    Data publikacji:
    2011-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.40.Tm
    43.40.Vn
    77.65.-j
    46.40.-f
    62.25.Jk
    Opis:
    The paper concerns an active vibration protection (p-reduction) of the structure via piezoelectric transducers; p-reduction corresponds to an active vibration reduction (a-reduction). The quantity and effectiveness of the (a- or p-) reduction, among other parameters, depend on the piezoelectric transducers distribution on the structure. The best results are obtained bonding piezoelectric transducers to the structure in the sub-domains with the largest curvatures; it is so-called quasi-optimal distribution of the piezoelectric transducers. Up to now, the quasi-optimal distribution was determined based on heuristic reasons only. The aim of the paper is to confirm quasi-optimal distribution in analytical way. The beam clamped at one end, vibrating with first three modes separately, is chosen as the research object. It is assumed that the piezoelectric transducers are exactly the same. Demanding the vibration amplitude to be equal to zero (i.e. p-reduction condition), the general formula for interacting forces piezoelectric transducers-beam is derived. Next, such an appropriate distribution of piezoelectric transducers is searched analytically, that the minimal forces are achieved; it leads to the best reduction effectiveness. It turned out that the analytical method pointed out quasi-optimal distribution of the piezoelectric transducers. The validation of theoretical considerations is confirmed numerically.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 6A; 936-941
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Low Temperature Crystal Structure Behaviour of Complex Yttrium Aluminium Oxides YAlO_3 and Y_3Al_5O_{12}
    Autorzy:
    Senyshyn, A.
    Vasylechko, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399474.pdf
    Data publikacji:
    2013-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Fn
    61.05.F-
    65.40.De
    65.60.+a
    63.70.+h
    Opis:
    Crystal structures of two yttrium aluminium oxides, namely $YAlO_3$ and $Y_3Al_5O_{12}$, were investigated in the temperature range 3.4-300 K by high-resolution neutron powder diffraction. Neither traces of phase transformations nor discontinuous changes of physical properties were observed. Thermal expansion of yttrium aluminium oxides was evaluated in terms of 1st order Grüneisen approximation, where the Debye temperatures and the Grüneisen parameters have been estimated for both compositions. Anomalies in the thermal expansion of yttrium aluminium perovskite have been observed and modelled using the Einstein oscillator with negative Grüneisen parameter. Extended bond length analysis revealed significant thermally-driven modifications of the aluminium-oxygen framework.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 2; 329-335
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analytical Determination of Optimal Actuators Position for Single Mode Active Reduction of Fixed-free Beam Vibration Using the Linear Quadratic Problem Idea
    Autorzy:
    Żołopa, E.
    Brański, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1196911.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.40.Tm
    43.40.Vn
    77.84.Dy
    77.65.-j
    46.40.-f
    62.25.Jk
    Opis:
    An analytical solution is obtained, based on linear quadratic problem well-known in the control theory. The problem is formulated for fixed-free beam vibration (fourth order partial differential equation) in Hilbert space and the point control and distributed output is considered. Beam deflection at any point is chosen as a criterion of optimization. In this case it means the linear quadratic problem. Up to now, the linear quadratic problem was formulated many times, but only for the time-dependent equation. The aim of the paper is to obtain the value of the cost functional formulated as the function of distribution of actuators. The minimum of this function leads to the optimal actuators location. The results obtained with this method confirm the results obtained in heuristic way and pure analytical one for separate mode; it is pointed out that the actuators ought to be bonded on the beam sub-regions in which the mode curvatures take their local maximums and the highest value.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4A; A-155-A-158
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effectiveness Analysis of the Beam Modes Active Vibration Protection with Different Number of Actuators
    Autorzy:
    Brański, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400105.pdf
    Data publikacji:
    2013-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.40.Tm
    43.40.Vn
    77.84.Dy
    77.65.-j
    46.40.-f
    62.25.Jk
    Opis:
    This paper deals with an active vibration protection (p-reduction) of the beam-actuators mechanical system, hence it concerns separate modes. The paper's aim is an effectiveness analysis of the p-reduction assuming different number of actuators. It is assumed a priori that actuators are bonded to the beam in the sub-domain with the largest curvatures and they are exactly the same. The beam clamped at one end is chosen as the research object. Next, as required by the p-reduction condition, the number and distribution of actuators are changed. It turns out that the best reduction effectiveness, measured via any effectiveness coefficient, is obtained for one actuator bonded in the sub-domain with the largest curvature. The validation of theoretical considerations is confirmed numerically.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 6; 1123-1127
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of Metal Coated Diamond Crystallites by Combined Photoacoustic Effect and Photothermal Radiometry
    Autorzy:
    Delgadillo-Holtfort, I.
    Gibkes, J.
    Chirtoc, M.
    Neubauer, E.
    Bein, B.
    Pelzl, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811541.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.47.Pm
    43.35.Ud
    78.20.Nv
    65.40.-b
    66.70.+f
    Opis:
    Photoacoustic effect and photothermal radiometry were applied to characterise the thermal properties of diamond crystallites which were coated by a Cu film, a Cr film and a Cr-Cu film. The Cu-coated diamond exhibits a considerable thermal barrier at the Cu-diamond interface which had disappeared for the crystallites with a thin bond Cr layer between diamond and Cu. The comparison of the responses of both measurement techniques reveals the non-negligible influence of the optical absorption in the visible and IR on the deduced thermal parameters.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6A; A-57-A-61
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Wave Measurements with a Mirage Detection for Investigation of Thermal Diffusivity of $GdCa_4O(BO_3)_3$ Single Crystals
    Autorzy:
    Bodzenta, J.
    Kaźmierczak-Bałata, A.
    Łukasiewicz, T.
    Hofman, B.
    Kucytowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811523.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.55.Tv
    42.70.Hj
    65.40.-b
    66.30.Xj
    66.70.-f
    Opis:
    Single crystals of $GdCa_4O(BO_3)_3$ were examined to determine their thermal properties. Samples were grown by the Czochralski pulling technique. There were three types of samples: a pure crystal, the crystal doped with neodymium (4 at.% of Nd), and the third one doped with ytterbium (7 at.% of Yb). All samples were rectangular prisms with edges parallel to the axes of the optical indicatrix X, Y, Z (principal axes). The thermal diffusivity was determined by means of the thermal wave method with the optical detection of the temperature disturbance based on a mirage effect. Experimental results showed anisotropy of the thermal diffusivity. The thermal diffusivity along Y direction has the highest value while values obtained in X and Z axes are much lower. Dopants cause decrease in the thermal diffusivity for all investigated directions.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6A; A-27-A-32
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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