共查询到20条相似文献,搜索用时 15 毫秒
1.
M. Abu-Shady 《International Journal of Theoretical Physics》2011,50(5):1372-1381
In this paper, we extended our work (Abu-Shady, Int. J. Theory Phys. 49:2425, 2010) to include nucleon properties. The field equations have been solved in the mean-field approximation using the effective
mesonic potential at finite temperature. We found that the nucleon first mass increases up to
\frac45 Tc\frac{4}{5} T_{c} MeV (where T
c
is the critical point temperature) then decreases at higher values of temperature which approach the critical temperature
(T
c
). In addition, we found that the magnetic moments of the proton and neutron can be increased by increasing the temperature
up to the critical temperature. Moreover, we examined the axial coupling constant g
A
(0), and the pion-nucleon coupling constant g
πNN
(0) as functions of temperature. The obtained results are compared with previous works. From the results, we conclude that
finite temperature plays a significant role in the change of behavior of nucleon properties. 相似文献
2.
A periodic Ising model has interactions which are invariant under translations of a full-rank sublattice of . We prove an exact, quantitative characterization of the critical temperature, defined as the supremum of temperatures for which the spontaneous magnetization is strictly positive. For the ferromagnetic model, the critical temperature is the solution of a certain algebraic equation, resulting from the condition that the spectral curve of the corresponding dimer model on the Fisher graph has a real zero on the unit torus. With our technique we provide a simple proof for the exponential decay of spin-spin correlations above the critical temperature, as well as the exponential decay of the edge-edge correlations for all non-critical edge weights of the corresponding dimer model on periodic Fisher graphs. 相似文献
3.
介绍了测量热力学微正则系综中哈密顿动力学系统温度的一种新的动力学途径,即在各态历经性的假设下,温度可作为函数(H/‖H‖2)在能量面上的时间平均算出.这一方法不仅给出了确定温度的一种有效的计算途径,而且也提供了动力学系统理论和哈密顿系统的统计力学之间的内在联系. A new dynamical approach for measuring the temperature of a Hamiltonian dynamical system in the microcanonical ensemble of thermodynamics is presented. It shows that under the hypothesis of ergodicity the temperature can be computed as a time average of the function, ·(H/‖H‖ 2) , on the energy surface. This method not only yields an efficient computational approach for determining the temperature, but also provides an intrinsic link between dynamical system theory and the statistical... 相似文献
4.
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6.
M. Abu-Shady W. Amer A. K. Abu-Nab 《International Journal of Theoretical Physics》2013,52(12):4477-4487
A phase transition, a critical temperature, and meson masses are studied in the extended quark sigma model, in which the effective mesonic potential is extended to include eighth-order mesonic interactions. The second derivative of the effective mesonic potential is applied to calculate the effective sigma and pion masses as functions of temperature. We find that the critical temperature assumes a lower value in comparison with that of original quark sigma model. A comparison with recent calculations of lattice QCD is introduced. The behavior of the phase transition remains unchanged when the higher-order mesonic interactions are included. We find that the spontaneous symmetry-breaking condition is necessary to satisfy the Goldstone theorem at low temperatures. 相似文献
7.
8.
Rupert L. Frank Christian Hainzl Robert Seiringer Jan Philip Solovej 《Communications in Mathematical Physics》2016,342(1):189-216
We consider the Bardeen–Cooper–Schrieffer free energy functional for particles interacting via a two-body potential on a microscopic scale and in the presence of weak external fields varying on a macroscopic scale. We study the influence of the external fields on the critical temperature. We show that in the limit where the ratio between the microscopic and macroscopic scale tends to zero, the next to leading order of the critical temperature is determined by the lowest eigenvalue of the linearization of the Ginzburg–Landau equation. 相似文献
9.
Starting from correlation identities for the Ashkin-Teller model and using correlation inequalities, we obtain rigorous upper bounds on the critical temperatures. The results were obtained in hexagonal, square, and cubic lattices and improve over effective field type calculations. The rigorous upper bounds results are compared to those obtained by other methods. 相似文献
10.
E. S. Filippov 《Russian Physics Journal》2016,58(12):1747-1752
11.
12.
Physics of Atomic Nuclei - The results of calculating the thermal electromotive force for a crystalline state and a model lattice of nanoclusters of noble transition metals Ag, Au, and Pd are... 相似文献
13.
采用光纤式光谱仪,对激光—双丝脉冲MIG复合焊接电弧等离子体辐射规律进行探讨,结合焊接过程中的高速摄像图片探讨激光与电弧的耦合机理,并运用Boltzmann图法计算出电弧等离子体的电子温度。结果表明,加入激光后,电弧的亮度提高,辐射增强,电弧偏向激光作用位置,同时电弧收紧,电弧截面减小,电弧稳定性增强;激光功率、焊接电流和焊丝间距对电弧等离子体温度有比较大的影响,随着激光功率的增加、焊接电流增大和焊丝间距的减小,电弧等离子体电子温度升高。 相似文献
14.
Doklady Physics - The critical cooling rates $${{{v}}_{{\text{c}}}}$$ at which pure metals Mg, Al, Ti, Fe, Co, Ni, Cu, Zr, Mo, Pd, Ag, Ta, W, Pt, Au, and Pb transit to an amorphous state (vitrify),... 相似文献
15.
We consider an Ising system in two dimensions with a two body ferromagnetic interaction J γ(x, y) that depends on the Kac scaling parameter γ. We prove that the inverse critical temperature βcr(γ) is strictly above the mean-field value (equal to 1), namely that there exists C>0 so that for any b<C, βcr(γ)> 1 + bγ2log γ?1 for all γ sufficiently small. The temperature shift Cγ2log γ?1 is to leading orders equal to the covariance of the magnetization fluctuations. 相似文献
16.
The size effects of the critical behaviors for the systems of interacting spins are discussed extensively in literature. In this paper, the finite-size dependence of the critical temperature and susceptibility of the ferroelectric thin film are investigated numerically based on the four-state Potts model with the nearest-neighbor interactions between the dipole moments. The four orientations of the domains exist in the ferroelectric film and the movement of the domain walls determines the polarization switching process besides the boundary conditions of the film. The critical exponents are obtained and our investigations show that the boundary conditions play the important roles for the ferroelectric properties of the thin films and the critical behavior of the thin films strongly depends on the feature of the surface. 相似文献
17.
The size effects of the critical behaviors for the systems of
interacting spins are discussed extensively in literature. In this
paper, the finite-size dependence of the critical temperature and
susceptibility of the ferroelectric thin film are investigated
numerically based on the four-state Potts model with the
nearest-neighbor interactions between the dipole moments. The four
orientations of the domains exist in the ferroelectric film and the
movement of the domain walls determines the polarization switching
process besides the boundary conditions of the film. The critical
exponents are obtained and our investigations show that the boundary
conditions play the important roles for the ferroelectric
properties of the thin films and the critical behavior of the thin
films strongly depends on the feature of the surface. 相似文献
18.
Mogilyuk T. I. Grigoriev P. D. Kesharpu K. K. Kolesnikov I. A. Sinchenko A. A. Frolov A. V. Orlov A. P. 《Physics of the Solid State》2019,61(9):1549-1552
Physics of the Solid State - The theoretical model of conductivity of a layered anisotropic normal metal containing small superconducting ellipsoidal granules with an arbitrary ratio of semiaxes is... 相似文献
19.
V. K. Kumykov V. A. Sozaev Z. Kh. Abazova M. V. Gedgagova 《Bulletin of the Russian Academy of Sciences: Physics》2018,82(7):817-819
Shortcomings of the zero creep compensation used in measuring surface tension σT of metals in the solid state are analyzed, especially its low sensitivity in measuring the temperature coefficient. A device for directly measuring σT with a high degree of accuracy and without the flaws of zero creep compensation is proposed. 相似文献
20.
Physics of the Solid State - The properties of long cylindrical superconductors with a diameter comparable with coherence length ξ have been investigated in the framework of the... 相似文献