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Wyświetlanie 1-15 z 33
Tytuł:
Elastic Constants for Various Classes of Solids at High Temperature
Autorzy:
Liu, Q.
He, Q.
Powiązania:
https://bibliotekanauki.pl/articles/2047361.pdf
Data publikacji:
2007-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.Dc
91.60.Ki
Opis:
In the present communication, a new relationship for the temperature dependences of elastic constants are developed using a new expression for the temperature dependence of bulk modulus and the formulation derived from Tallon's model. The proposed relationship is applied to study elastic constants of NaCl, KCl, CaF$\text{}_{2}$, MgO, CaO, and Mg$\text{}_{2}$SiO$\text{}_{4}$. The result obtained for second-order elastic constants are found to compare well with the experimental data.
Źródło:
Acta Physica Polonica A; 2007, 112, 1; 69-76
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations of the Optical and EPR Spectra for $Cr^{3+}$ Ions in Diammonium Hexaaqua Magnesium Sulphate Single Crystal
Autorzy:
Wei, Q.
Powiązania:
https://bibliotekanauki.pl/articles/1535818.pdf
Data publikacji:
2010-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Fc
71.70.Ch
71.55.Ht
Opis:
The relations between spin-Hamiltonian parameters and local structure around $Cr^{3+}$ in diammonium hexaaqua magnesium sulphate single crystal were established. On the basis of this, the spin-Hamiltonian parameters, optical spectra and the local structure were investigated successfully. The calculated results are in good agreement with experimental data. This shows that the distortion model adopted in this paper is reasonable.
Źródło:
Acta Physica Polonica A; 2010, 118, 4; 670-672
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pressure-Interatomic Separation-Temperature Relationship of Alkali Halides
Autorzy:
Liu, Q.
Powiązania:
https://bibliotekanauki.pl/articles/1505082.pdf
Data publikacji:
2011-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.30.-t
65.40.De
Opis:
A new method for the determination of pressure-interatomic separation-temperature relationship is investigated and applied for some alkali halides. The method is developed by using the Mie-Gruneisen equation of state and the Anderson thermal pressure and an ionic model based on Harrison's treatment of overlap repulsive potential which takes into account the interactions up to second neighbors. It is found that the new method yields satisfactory results in agreement with the available experimental data.
Źródło:
Acta Physica Polonica A; 2011, 119, 6; 829-834
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pressure Dependence of Interatomic Separation and Thermal Expansivity for Alkali Halides and Periclase (MgO)
Autorzy:
Liu, Q.
Powiązania:
https://bibliotekanauki.pl/articles/1808121.pdf
Data publikacji:
2009-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.30.-t
65.40.De
91.60.Ki
Opis:
In this paper, a new isothermal equation of state is developed based on an approximation for the volume dependence of the Anderson-Grüneisen parameter $δ_T$ along isotherm. The values of interatomic separation r with the change of pressure for nine alkali halides and periclase were investigated with the help of the new isotherm equation of state. The compression data are used to predict the pressure dependence of the coefficient of volume thermal expansion. The results are compared with the available experimental data and other theoretical results.
Źródło:
Acta Physica Polonica A; 2009, 115, 3; 709-712
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations of the EPR and Optical Spectra for $VO^{2+}$ in $C_3H_7NO_2$ Powders
Autorzy:
Wei, Q.
Powiązania:
https://bibliotekanauki.pl/articles/1537793.pdf
Data publikacji:
2010-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Fc
71.70.Ch
78.50.Ec
71.55.Ht
Opis:
The EPR and optical spectra for $VO^{2+}$ in $C_3 H_7 NO_2$ powders are calculated from complete diagonalization method and perturbation theory method, respectively. The calculated results are in good agreement with observed values. The negative signs of hyperfine structure constants $A_∥$ and $A_⊥$ for $VO^{2+}$ in $C_3 H_7 NO_2$ powders are also suggested from the calculations.
Źródło:
Acta Physica Polonica A; 2010, 117, 6; 962-964
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Temperature Error Correction Method for a Thermometer Screen
Autorzy:
Yang, J.
Liu, Q.
Powiązania:
https://bibliotekanauki.pl/articles/1032598.pdf
Data publikacji:
2017-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
temperature error
surface air temperature
computational fluid dynamics
screen
Opis:
Due to solar radiation exposure, air flowing inside a thermometer screen may produce a measurement error of 0.8°C or higher. To improve the air temperature observation accuracy, a temperature error correction method is proposed. The correction method is based on a computational fluid dynamics method and a genetic algorithm method. The computational fluid dynamics method is implemented to analyze and calculate the temperature errors of a screen under various environmental conditions. Then, a temperature error correction equation is obtained by fitting the computational fluid dynamics results using the genetic algorithm method. To verify the performance of the correction equation the screen and an aspirated temperature measurement platform are characterized in the same environment to conduct the intercomparison. The aspirated temperature measurement platform serves as an air temperature reference. The mean temperature error given by measurements is 0.77°C, and the mean temperature error given by correction equation is 0.79°C. This correction equation allows the temperature error to be reduced by approximately 97.5%.
Źródło:
Acta Physica Polonica A; 2017, 132, 4; 1301-1305
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tunable Entanglement Sudden Death and Birth in Cavity QED with Nonlinear Kerr-Like Medium
Autorzy:
He, Q.
Xu, J.
Powiązania:
https://bibliotekanauki.pl/articles/1493398.pdf
Data publikacji:
2011-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.65.Ud
03.67.-a
03.67.Mn
Opis:
The influence of nonlinear Kerr-like medium on the phenomenon of entanglement sudden death and birth in a double Jaynes-Cummings model is investigated. It is shown that the entanglement sudden death and birth phenomenon may appear in this system and the duration of entanglement sudden death and birth can be controlled by the nonlinear Kerr-like medium. Particularly, the phenomenon of entanglement sudden death and birth disappears one after another if we increase the value of the Kerr coefficient χ continuously, and all disappears if the value of the Kerr coefficient χ is large enough.
Źródło:
Acta Physica Polonica A; 2011, 120, 3; 390-396
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interaction between Polymer Brush and Nanoparticle: Brownian Dynamics Investigation
Autorzy:
Zhang, Q.
Xiang, X.
Powiązania:
https://bibliotekanauki.pl/articles/1400121.pdf
Data publikacji:
2013-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.45.Xt
05.45.Jn
Opis:
We use Brownian dynamics simulations to study the adsorption behavior of a nanosized particle on polymer brushes. The adsorption process, the dynamic behavior of the nanoparticle in brush, the penetration depth, and the diffusion coefficient of the nanoparticle in different depths of the brush are all investigated for different grafting densities. We provide an area density Γp, which is the area average of the monomer number above the embedded nanoparticle in brush. We find that this area density explains well qualitatively the experimental phenomenon that the nanoparticles exhibit a maximum in the adsorbed amount as a function of the grafting density of brush.
Źródło:
Acta Physica Polonica A; 2013, 123, 4; 642-646
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Morphology Transformation of a Polymeric Micelle Induced by Two Encapsulated Particles
Autorzy:
Zhang, Q.
Xiang, X.
Powiązania:
https://bibliotekanauki.pl/articles/1377854.pdf
Data publikacji:
2014-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.35.Np
82.35.Jk
Opis:
We begin with a pair of spherical particles encapsulated in a micelle and solve the problem within the self-consistent field theory to investigate the morphology transformation of the micelle induced by two nano-particles. The micelles are based on amphiphilic diblock copolymer AB in homopolymer A solvents. The nano-particles are simple models of proteins or colloids. We predict different micelle structures, and relate these morphologies to particle sizes, distances between two particles, and chemical potentials of the amphiphile molecules. There are found complex structures of the micelle induced by the twin particles: many reverse micelles only with even numbers or only one micelle attached at one of the two particles. These results are of immediate interests to the interactions of micelles and particles, as well as to the transitions between vesicles and micelles.
Źródło:
Acta Physica Polonica A; 2014, 126, 6; 1338-1342
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A New Potential Superhard Phase of $OsN_2$
Autorzy:
Fan, Q.
Wei, Q.
Yan, H.
Zhang, M.
Zhang, D.
Zhang, J.
Powiązania:
https://bibliotekanauki.pl/articles/1205218.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.de
65.40.-b
62.20.dq
Opis:
A new phase of C2/m $OsN_2$ is proposed in this paper. The crystal structure, elasticity and electronic properties of C2/m $OsN_2$ were studied by first-principles calculations. The elastic constants, the elastic moduli (B, G, and E) and Poisson's ratio v of $OsN_2$ have been investigated. From the first-principles calculations, we find that C2/m $OsN_2$ is metallic and mechanically stable. The quasi-harmonic Debye model, using a set of total energy versus molar volume obtained from the first-principles calculations, is applied to the study of the thermal and vibrational effects. The dependence of structural parameters, thermal expansions, heat capacities, Grüneisen parameters and Debye temperatures on the temperature and pressure are obtained in the whole pressure range from 0 to 80 GPa and temperature range from 0 to 800 K as well as compared with available data.
Źródło:
Acta Physica Polonica A; 2014, 126, 3; 740-746
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Decay Kinetics from $\text{}^{4}$I $\text{}_{9}\text{}_{/}\text{}_{2}$ State of Mixed 2,6 Pyridine Dicarboxylate-Acetylacetonate Complexes
Autorzy:
Xie, R.-Q.
Flint, C. D.
Powiązania:
https://bibliotekanauki.pl/articles/1945621.pdf
Data publikacji:
1996-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
13.40.Hq
31.70.Ie
78.55.Hx
Opis:
The $\text{}^{4}$I $\text{}_{9}\text{}_{/}\text{}_{2}$ → $\text{}^{4}$I $\text{}_{15}\text{}_{/}\text{}_{2}$ luminescence decay curves for a series of complexes Er(pdc)$\text{}_{n}$(acac)$\text{}_{3-n}$ (pdc = pyridine-2,6-dicarboxylate, acac = acetylacetonate, n = 0, 1, 2, 3) as solids and in dilute aqueous solutions have been investigated. The decays are multiexponential, possible reasons for this and for the short lifetimes observed are discussed.
Źródło:
Acta Physica Polonica A; 1996, 90, 2; 323-325
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface Geometric Structures of Cu Deposited upon α-Al$\text{}_{2}$O$\text{}_{3}$ (0001)
Autorzy:
Guo, Q.
Møller, P.
Gui, L.
Powiązania:
https://bibliotekanauki.pl/articles/1920759.pdf
Data publikacji:
1992-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.65.+g
68.55.Bd
Opis:
Upon deposition of Cu on a 1 × 1 α-Al$\text{}_{2}$O$\text{}_{3}$ (0001) surface at room temperature the surface structure was found to change with increasing amounts of Cu deposited, from two-dimensional monolayer islands through three-dimensional nuclei until reaching a thin film. Subsequent surface heat-treatment to 650°C produced a stable Cu(111)-R30° superstructure as observed by LEED.
Źródło:
Acta Physica Polonica A; 1992, 81, 6; 647-651
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Properties of InAs Quantum Dots
Autorzy:
Willander, M.
Zhao, Q. X.
Jacob, A. P.
Wang, S. M.
Wei, Y. Q.
Powiązania:
https://bibliotekanauki.pl/articles/2035579.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.Hc
78.55.Cr
Opis:
InAs quantum dots grown on GaAs substrate were investigated by optical spectroscopy. We particularly emphasized on the photoluminescence intensity, the stability of the photoluminescence intensity versus temperatures and wavelength of the InAs dot emission at various thermal treatments and different structures. We found that hydrogen can strongly passivate nonradiative centers without causing any structure degradation, and both n- and p-type modulation doping can reduce the decrease in the photoluminescence intensity when the sample temperature increases from the helium temperature to room temperature. The emission wavelength and the efficiency of the InAs quantum dots can also be manipulated by choosing proper materials of cap layer.
Źródło:
Acta Physica Polonica A; 2002, 102, 4-5; 567-576
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Evidence for Jahn-Teller Transition in a Fe(II)Fe(III) Bimetallic Oxalate
Autorzy:
Tang, G.
He, Y.
Xu, F.
Zhang, Q.
Powiązania:
https://bibliotekanauki.pl/articles/1400401.pdf
Data publikacji:
2013-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Xx
76.80.+y
Opis:
Bimetallic oxalate ${[N-(n-C_4H_9)_4][FeFe(C_2O_4)_3]}_{n}$ has been investigated by the Mössbauer spectroscopy. The Mössbauer studies confirm that high-spin Fe(III) (S=5/2) and Fe(II) (S=2) ions are present in the compound. These spectra above 60 K consist of three quadrupole doublets, indicating that there are three different Fe sites in the material. The Mössbauer results reveal that spontaneous magnetization of Fe(II) sublattices increases more steeply than that of Fe(III) sublattices as the temperature decreases from $T_{C}$. Great increase of quadrupole splitting at 50 K provides compelling evidence for the predicted Jahn-Teller transition.
Źródło:
Acta Physica Polonica A; 2013, 123, 1; 118-120
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin-Spin and Spin-Other-Orbit Interactions of Spin-Hamiltonian Parameters for $3d^{2(8)}$ Ions in $Al_2O_3$ Crystals
Autorzy:
Wei, Q.
Guo, L.
Yang, Z.
Wei, B.
Powiązania:
https://bibliotekanauki.pl/articles/1505102.pdf
Data publikacji:
2011-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Fc
71.70.Ch
75.10.Dg
71.55.Ht
Opis:
By considering weaker magnetic interactions (including spin-spin and spin-other-orbit interactions) in Hamiltonian, the spin-Hamiltonian parameters, including the zero-field splitting parameter D and g factors $(g_∥, g_⊥)$ for $3d^{2(8)}$ ions in $Al_2O_3$ crystals have been investigated. The results show that the contributions to D, $g_∥$ and $g_⊥$ from the spin-orbit interaction are dominant. The contributions from weaker magnetic interactions to D decrease (increase) with increasing charge of impurity ions for $3d^2 (3d^8)$ ions.
Źródło:
Acta Physica Polonica A; 2011, 119, 6; 857-859
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 33

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