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Skocz do pozycji: 1.

Tytuł:: Conformal Invariance and Conserved Quantities οf Mei Symmetry for Lagrange Systems
Autorzy:: Cai, Jian-Le
Powiązania:: https://bibliotekanauki.pl/articles/1808004.pdf
Data publikacji:: 2009-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 02.20.Sv
11.30.-j
Opis:: Conformal invariance and conserved quantities of the Mei symmetry for the Lagrange systems under the infinitesimal transformation of groups are studied. Firstly, the definition of conformal invariance of the Mei symmetry is given, together with its criterion equations and determining equations. Then the systems' conserved quantities are obtained using the structure equation satisfied by the gauge function. Lastly, an example is taken to illustrate the application of the result.
Źródło:: Acta Physica Polonica A; 2009, 115, 5; 854-856
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Conformal Invariance and Conserved Quantity of Hamilton System under Second-Class Mei Symmetry
Autorzy:: Cai, Jian-Le
Powiązania:: https://bibliotekanauki.pl/articles/1538629.pdf
Data publikacji:: 2010-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 02.20.Sv
11.30.-j
Opis:: Conformal invariance and conserved quantities of Hamilton system under second-class Mei symmetry are studied. The single-parameter infinitesimal transformation group and infinitesimal transformation vector of generator are introduced. The definitions about conformal invariance of Hamilton function and conformal invariance of Hamilton system under second-class Mei symmetry are given. The relationship between the system's conformal invariance and Mei symmetry are discussed. The necessary and sufficient condition that the system's conformal invariance would be Mei symmetry is deduced. The system's corresponding conserved quantities are obtained with the aid of a structure equation which is satisfied by the gauge function. Lastly, an example is provided to illustrate the application of the result.
Źródło:: Acta Physica Polonica A; 2010, 117, 3; 445-448
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Photo-oxidative Aging Behaviors of Acrylic Coatings during UV Irradiation Investigated by Positron Annihilation Spectroscopy
Autorzy:: Zhao, Xipo
Cai, Xiaolin
Liu, Chang
Chen, Ting
He, Chunqing
Fang, Pengfei
Peng, Shaoxian
Powiązania:: https://bibliotekanauki.pl/articles/1033253.pdf
Data publikacji:: 2017-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: Acrylic coating
UV irradiation
positron annihilation spectroscopy
Opis:: Slow positron annihilation spectroscopy, contact angle and scanning electron microscope (SEM) were employed to investigate the surface polarity and morphologies as functions of aging time in acrylic coatings during UV-a irradiation. The S parameter plots of each exposed sample are lower than that of the virgin sample in the whole range of E. The S parameter plots become lower as the exposing longer time, indicated that the irradiation generated more polar groups and increased the oxidation layer depth. Combined with surface morphology and the surface energy of acrylic coating, the variation of contact angle, and surface energy, polar component and dispersive component is related with surface polarity and morphologies.
Źródło:: Acta Physica Polonica A; 2017, 132, 5; 1527-1530
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Critical State Stability and Flux Jumps Dynamics in a Single Crystal of $YBa_{2}Cu_{3}O_{7-δ }$
Autorzy:: Nabiałek, A.
Vasiliev, S.
Chabanenko, V.
Yao, X.
Cai, Y.
Guo, L.
Kuzovui, M.
Powiązania:: https://bibliotekanauki.pl/articles/1431339.pdf
Data publikacji:: 2012-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.72.-h
74.25.Sv
Opis:: We studied the critical state stability and the dynamics of the flux jumps, caused by thermomagnetic avalanches, in a large (3× 3× 1 $mm^{3}$) single crystal of $YBa_{2}Cu_{3}O_{7-δ }$ superconductor. Flux jumps were observed only at the lowest temperatures attainable in our system (at about 2.2 K) and for the external magnetic field parallel to the c-axis of the investigated crystal. It is shown that thermomagnetic avalanches are initiated in dynamic conditions, for which the magnetic diffusivity is much smaller than the thermal diffusivity. For large single crystals of $YBa_{2}Cu_{3}O_{7-δ }$ immersed directly in liquid helium, the analysis of the critical state stability can be performed in isothermal approximation. However, the conditions of the critical state stability can change dramatically by improving the thermal isolation between the sample and the surrounding coolant. The dynamics of the flux jumps was analyzed in the framework of the model of magnetic diffusion. It is shown that the magnetic diffusivity changes dramatically during the process of the thermomagnetic avalanche. We also studied the influence of the external magnetic field and of the magnetic history on the duration of the flux jumps.
Źródło:: Acta Physica Polonica A; 2012, 121, 4; 836-840
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Optical and Scintillation Properties of $Bi_{4}(Ge_{x}S_{1-x})_{3}O_{12}$ Single Crystal
Autorzy:: Xiao, X.
Xu, J.
Lu, B.
Cai, W.
Zhang, Y.
Shen, H.
Yang, B.
Xiang, W.
Powiązania:: https://bibliotekanauki.pl/articles/1399369.pdf
Data publikacji:: 2015-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 81.10.Fq
61.05.C-
78.20.Ci
78.70.Ps
Opis:: The solid solution crystals, $Bi_{4}(Ge_{x}Si_{1-x})_{3}O_{12}$ (BGSO) with x=0, 0.05, and 0.15, have been grown by the modified vertical Bridgman method. The as-grown crystals show 80% of transmittance with an absorption edge of 285 nm. The relative light yields of BGSO crystals are found to be 7.2%, 6.3%, and 4.2% of CsI(Tl) crystal for x=0, 0.05, and 0.15, respectively. The energy resolutions of these crystals are 18.9%, 21.3%, and 24.7%, respectively, with PMT for 662 keV gamma rays at room temperature when exposed to $\text{}^{137}Cs$ γ -ray. The scintillation performance of BGSO crystals clearly deteriorates with the increase of Ge content. However, the appropriate number of germanium ions doped to BSO crystal can improve its crystallization behavior and effectively restrain component segregation. It is expected that large size crystals of BGSO will be grown and applied to the dual readout calorimeter in the nearest future.
Źródło:: Acta Physica Polonica A; 2015, 127, 3; 854-858
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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