In this paper, five types of similarity reductions of Whitham-Broer-kaup equations in shallow water are given by both the classical Lie approach and the direct method. The Painlevé Ⅱ type reduction equation obtained by the classical Lie approach is only the special case of that obtained by the direct method. In the similarity reduction results of the direct method, three types of singularity point...
Taking the optical system as a prototype, this paper demonstrates that a quasi-thermodynamic model for dissipative systems, satisfying the principle of detailed balance, may be developed, which is parallel to the traditional thermodynamics. The present systems are described by the generalized dynamical equation of nonlinear optical cavities, introduced in previous work of Ou Fa et al. In view of t...
In this paper, the electronic structures and energy levels of the complex ion (CrO4) as Cr-O distance changes are analyzed with the spin-polarized MS-Xα method, Under the symmetry Td the one-electron energy levels and eignfunctions, electronic configuration of ground state, optical transitions of lower excited state,and schematic diagram of the energy levels of the three complex ions,(CrO4)6-,(CrO...
A perturbation method is used to evaluate the energy levels and oscillator strengths of sodium atoms (m=-2,π2=+)in a strong magnetic field. The main features of the calculated spectra which lie in the strong-field-mixing regime agree well with the corresponding experimental results. Besides the conventional quasi-Landau resonance with spacing equal to 1.5?ωc (ωc is the electron cyclotron frequency...
Schaber and Martin have investigated exp rimentally the properties of the yield of (Na14Cl13)+ clusters in detail. They obtained the yield of (Na14Cl13)+ clusters as a function of oven-nozzle distance with the quadrupole mass spectrometer. In the present paper, by using the fractal theory, the distribution function is numericalls simulated and analyzed theoretically.
The field squeezing effect for off-resonant two-photon laser with an injected signal in good-cavity limit is studied by means of Fokker-Planck equation of the peneralized Wigner distribution. Under certain off-resonance condition, the field squeezing effect of two-photon laser may be observed.
Two level atoms are injected into ideal cavity one by one to interact with the light field therein which intially is in coherent state. In one-photon transition case, the quadrature variance could be reduced by this means for suitably chosen interaction time t. But there exists some limitation, the squeezing will become worse if the number of times K is too large. In twophoton transition case, for...
In this paper, the squeezing properties of orthonormal eigenstates of high order power of photon annihilation operator αk (k≥3) are studied. It is shown that the amplitude Nth-power squeezing (k=2N) can exist in the eigenstates when k is even.
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES
In this paper, a detailed analysis of the relationship between various criterion factors and result errors of a lot of simultaneous equations for X-ray quantitative phase analysis is carried out and the factor g for quantitative criticizing the stability of the equations is found. According to the g factor of the different equations composed by the different samples combination, one can select the...
The behavior of internal friction during strain ageing and amplitude-dependent effect behaved in high purity aluminium were studied. After specimen is twisted to a certain degree, internal friction exhibits anomalously amplitude dependent effect. This can be observed in a large temperature region but does not appear in completely annealed or elongated specimens. The way of twisting deformation of ...
Tre vapor-solid phase transition of the motybdenum oxide was investigated in the stochastic nonlinear system which was in far from equilibrium state. Some thin molybdena crystals and various two-dimensional fractal structures consisted of the molybdena whiskers were ob-served. The possible mechanism of the fractal structures is discussed in terms of nonequilibrium thermodynamics of irreversible pr...
In this paper, we report the results of the growth of a series of ZnSe films on (100) GaAs at different substrate temperatures by hot wall epitaxy. The quality of ZnSe films has been studied by X-ray diffraction, Raman scattering and photoluminescence. The results show that: 1) We have got (100)-oriented single crystal fillms, but the quality becomes worse when lowering the substrate temperature. ...
Various reconstructions (c(2×6), (1×3) and (2×3)) of the GaSb (100) surface have been studied by LEED, XPS and UPS. All the three reconstructed surfaces are terminated by Sb atoms with some rows missing. Annealing in an Sb environment of both MBE-prepared, Sbdimerized c(2×6) reconstruction and IBA-prepared, Gaislands-existing (2×3) reconstruction leads to the same (1×3) reconstruction.
We report a detailed photoreflectance study at 300 and 77K of a set of GaAs/ Al0.23Ga0.77As double quantum well samples with different barrier widths Lb0.23Ga0.77As valence band to the first electron confined state and from the first light hole confined state to the bottom of the Al0.23Ga0.77As conduction band. By using these transitions the conduction band-edge discontinuity has been determined t...
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES
This paper is devoted to the study of electronic and phonon spectra of a kind of generalized Fibonacci quasiperiodic chain (Twins model). Renormalization group results show that the electronic spectrum has a trifurcating selfs milar structure but the middle subbends in every hierarchy are similar to spetral structure of the periodic systems. The analysis is confirmed by numerical results. While th...
A reasonable model is proposed to calculatee the temperature dependence of photoconductivity (PC) in a-Si:H and a-Si:H/a-SiNx:H super lattices. Simmons-Taylor theory and the occupation statistics of correlated defects are used to describe band tail states and dangling bonds states. As in a-Si:H/a-SiNx:H superlattices, the electronic potential and charge distributions resulting from space-charge do...
The infrared refleotion spectra of Y1-xPrxBa2Cu3O7+δ(x = 0,0.1,0.2,0.4,0.5, 0.6, 1.0) are measured in the temprature range of 4.2 to 300K. The measurements show that Ba mode has double mode behavior, the strength of which inverses with increasing x, and that the position of the reflection peak at 194cm-1, which has been identified as Y mode of YBa2Cu3O7+δ, is indenpendent of the density of Pr, i. ...
In this work, 119Sn is used as probe-atom, nd room temperature Mossbauer measurement of Bi1.68Pb0.32Sr1.75Ca1.75Cu2.65-xSnxOy(x=0.2-0.8) sample is performed. Combined with the results of X-ray diffraction and electric characteristic measurement, the relation between the occupancy of Sn in the sample and its electric characteristics is analysed, and an conclusion that squarecoordinated Cu performs ...
Properties of a series of superconducting compounds of nominal composition (Bi2-x,Nbx)Sr2Ca2(Cu3-yNby)Ox(x=0-1.0, y=0-1.0) have been investigated using electrical resistivity, a.c magnetic susceptibility and X-ray powder diffraction measurements. When x =0.2-0.3 or y=0.2, 2223 phase (Tc~110K) in samples is significantly enhanced. The added Nb in the sample with Bi1.7Nb0.3Sr2Ca2Cu3Oy has obvious ef...
The structural and magnetic properties of the two sources deposited Fe/Pd superlattices were studied. The samples were prepared by keeping the thickness of Pd layers dpd at 30? and varying dFe from 56 to 5.7?. The reduced saturation magnetization of Fe/Pd superlatti-ces, σt increased with the decrease of dFe this was due to the polarization effect of Pd. The effective thickness of polarization eff...
The normal ground state stability of infinite polyacenacene is investigated by means of the method of quantum field theory in statistical physics. The condensed phases such as charge density wave (CDW), spin density wave (SDV) and superconducting phases are predicted within the random phase approximation (RPA). In particular, we show that there is a possibility that polyacenacene could be a high t...
The transfer-matrix method is employed to investigate the spin waves in a magnetic super-lattice with a single-ion uniaxial anisotropy. The dispersion equation of the spin waves is obtained. The effect of anisotropy strength on the spin waves spectrum is also discussed.
The variation of surface enhanced Raman scattering was observed as a small amount of KCl was added in SERS system and the intensity ratio of characteristic Raman peaks was detected for two kinds of molecules. In addition the change of orientation of adsorbed molecule on the silver surface was also analysed.
CO, O and K coadsorption on Cu(lll) at oom temperature was investigated using high resolution electron energy loss spectroscopy (HREELS). The experimental results show that CO can adsorb on Cu(lll) surface precovered with K at room temperature and coadsorption of CO and K produce the K-O complexes. The K-O complexes can form only from the depolarized K at higher K coverage (θk>0.04).