The causes and control methods of the magnetic parameter drifts for magnetic bubble LPB garnet films are investigated. It is considered that the main cause of the magnetic parameter drifts is the garnet heterogeneous nucleation and growth of the supersaturated melt. The phenomenon of melt compositional drift is explained in terms of the effective concentration of melt nutrient Reff = R4-Rn-Re, whe...
We have measured the saturated polar Kerr rotation of In-substituted single crystal BCVIG, {Bi3-2xCa2x}[Fc2-yIny] (Fe(3x)Vx)O12, in the spectra range of 0.45-0.80 μm. A rotation peak near 0.47 μm was found. The room temperature dependence of the rotation peak value 2θK(0.47μm) on the composition was obtained by varying the substitution quantity of In3+ and Bi3+. It was found that the Kerr rotation...
The solidification progresses of rapidly quenching from high-tempersture melts to form amorphous alloy ribbons were analysed. It was pointed out that different regions of the amorphous ribbon have different advancing ways of solidification in the process of solidifying, thus different local stress fields will exist in these regions. The internal stress fields and the stress-magnetic anisotropies i...
In this paper, we investigated the stabilization of stimulated Brillouin scattering due to the non-linearity. We are mainly interested in the Landau damping effect on non-linear stabilization, we thus solved the time, space and time-space equations and obtained the approximate analytical expressions for the field energy densities, field amplitude, saturation time and space size etc. as functions o...
In this work, a simulation experimental scheme of phase adjustments for a phase-adjusted focusing laser accelerator is discussed, and a method of specific design for the phase plate is given. We have produced the phase plate, and carried out the experiment of phase adjustment. The experimental results are consistent with the theoretical design.
By using the irreducible tensor operator method, two corollaries are derived from generalized Wigner-Eckart theorem and the results associated with the corollaries are obtained. For the d2 ions in a trigonally distorted cubic crystal field, we have considered both the interactions of all possible Vc and (Vt+Hs) and taken into account the coval-ent bonding and dynamical Jahn-Teller effects with red...
Starting from a modified Kobayashi-McMillan hamiltonian, (1) phase diagrams of liquid crystals of long molecules are calculated in the mean field approximation; (2) orientation correlation functions are calculated; (3) magnetic birefringence experimental results (of Muta et al.) on homologous series are analysed and explained qualitatively for the first time; (4) apparent exponent △ is calculated ...
Based on successive correction method, we have solved LSS equation numerically and calculated the range statistic parameters Rp,△Rp and R⊥ for ions implanted in GaAs. We propose simple formulas for initial values in calculating Rp,△Rp and R⊥; by using these formulas, the zero-energy divergence can be avoided and sufficient accuracy achieved. The expressions for β-integration are given to save comp...
It is pointed out that if a superconducting ring containing a weak link is placed in a cavity, which is in resonant with the current flowing in the ring, i.e., when the frequency of the Josephson current or one of its n-th harmonies is equal to the cavity frequency, and if the cavity has sufficiently high Q-value, then the feedback of the stationary electric-magnetic wave will act on the ring itse...
H. Kawamura studied the solid-fluid phase transition of a two-dimensional hard disk system by using the Collins' model, but the 4 co-ordination was neglected. In this paper, we have taken into account the 4 co-ordination and the attractive interaction. The thermodynamic functions of the two-dimensional system are calculated. The dependence of the transition point on the percentage of 4 co-ordinati...
The radiation of positron annihilation in two aluminum samples from different origins was measured with the Ge(Li) detector. Using the 482 keV γ peak of 181Hf as reference, the relative positions of the annihilation peak centers were repetitively determined, the precision of the determination reached ± 6 eV. The results show that the rest mass of electron in these two different aluminum samples is...
In this paper, we report the crystal structure of the low temperature form of barium borate-a new type of SHG material. Ba3(B3O6)2 crystal belongs to trigonal system with space group C34-R3. There are 6 formula units in one hexagonal cell. The unit cell dimensions referring to hexagonal axes are a = b = 12.532?, c = 12.717?. Diffraction data were collected on Philips PW-1100 four-circle diffractom...
Dibenzo-18-Crown-6 Yttrium Isothiocyanate crystal is the complex of Crown and Yttrium Isothiocyanate. The molecular formula is C23H24O6N3S3Y. The crystal belongs to the orthogonal system, with space group D2h-Pmcn. The cell dimensions are a= 19.885(9)?, b = 17.283(8)?, c = 7.942(3)?. Pour molecules are contained in a cell (z = 4). The nine-coordination polyhedron around the Y(111) ion was formed b...
The molecular formula of Norsesquilerpenoid Lactone is C14H20O3. The crystal belongs to the orthogonal system, with space group D24-P21 21 21. The cell dimensions are α=7.526(3)?, b=24.642(10)?, c=6.887(2)?. Four molecules are contained in a cell (z = 4). Intensity data were collected on a RASA-IIS four circle diffractometer.The original MULTAN-80 was proved to be not successful in solving the str...
In this paper, the method of artificial phase degeneration has been examined with a complex heavy-atom-containing crystal structure. The result obtained is satisfactory.
In this paper, we suggest an iterative correction method for indexing powder diffraction patterns when the rough unit-cell dimensions are known. When the error of the original rough unit cell dimensions is not very large (<1-3%) and the measurement data of diffraction line are precise (△2θ<0.04°), satisfactory results can be obtained.
The formula of indexing electron diffraction patterns from tilted crystal is as follows, [hkl]=[xy0]Γ(θ)Γ(ω0-ω)Γ(θ0)P-1H, where θ,ω are rotating angles and θ0,ω0 primary ones. A program applicable to all the crystal Systems has been worked out. This method is simpler and faster than that of stereographic projection.
The difficulty of automatic indexing of Kikuchi lines by computer lies in exper-mental errors in the mesurements of Kikuchi line positions and the camera constant. These errors were minimized by adopting a least square method to fit Kikuchi lines and correcting camera constant automatically. In addition, the geometry of lattice planes was used to aid the indexing of Kikuchi lines. Consquently, the...
By tilting the needle like crystals in a partially crystallized Ni P amorphous alloy in a transmission electron microscope, the lattice type of a metastable phase with approximate composition Ni2.2 P has been uniquely determined to be hexagonal, α = 6.73? and c = 9.42?. In the c direction, the layer stacking sequence is AA…. High resolution lattice image of the (001) planes as well as the diffract...
Hydrogen related defect states generated in n-FZ Si(H2) single crystal after neutron irradiation have been studied by IR absorption. We observed some new absorption peaks that have not yet been reported. These peaks appear at 1992cm-1 and 1857 cm-1 in non-irradiated and irradiated specimens respectively. All absorption peaks arising from hydrogen and hydrogen related defects of n-FZ Si(H2) before ...