[en] Quantum oscillations of the spin conductance through regular and chaotic 2D quantum dots under the varying Rashba spin-orbit interaction and at zero magnetic field have been investigated numerically by summing up the spin evolution matrices for classical transmitting trajectories. The Fourier analysis of these oscillations indicates a strong geometry dependence of the power spectra. The spectra for narrow rings are dominated by a single peak as previous analytic result, for regular quantum dots are represented by multiple peaks, and for chaotic quantum dots by quasi-continuum peaks

[en] Isotropic and anisotropic out-of-plane deformations induced by thin-film residual stress on thin cubic materials are studied. By transforming the compliance tensor, an analytical expression can be derived for the biaxial stiffness modulus for all directions in any given cubic crystal plane. A modified Stoney's equation, including both isotropic and anisotropic terms, can be formulated to predict the anisotropic out-of-plane deformation. The isotropic and anisotropic deformations are then described using the Zernike polynomials U21 and U22, respectively. Experimental results from (100) and (110) silicon wafers confirm the model by quantitatively comparing the changes in Z21 and Z22 coefficients due to thin-film stress

[en] In this study, the formation mechanism, particle morphology and magnetic properties of 3BaO·2CoO·12Fe₂O₃ (Co₂Z) ferrite obtained using the molten salt method (Li₂SO₄-Na₂SO₄) were investigated using X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, and superconducting quantum interference device magnetometer. The results of this investigation indicate that the crystalline phases and morphology were sensitive to (1) the starting oxide ratio to molten salt, and (2) the reaction temperatures. Hexagonal plate-like Co₂Z particles were obtained with a starting oxides/molten salt ratio of ((7)/(3)). The coercivity of the Co₂Z ferrite powder synthesized in this study was much lower than that produced in previous studies

[en] Copper tetra-tert-butyl Phthalocyanine (CuTTBPc) was vacuum deposited onto substrates of hydrophilic glass, hydrophobic silanized-glass, and one layer CuTTBPc LB film. The effects of substrates on the growth behavior and film characteristics of CuTTBPc were studied by atomic force microscopy as well as XRD and dynamic contact angle analyzer. The results show that, in the early growth stage, the island density and coverage ratio of CuTTBPc are small on hydrophilic glass surface. This result is caused from the weak interaction of CuTTBPc molecules to the glass which leads to a small nucleation rate and rougher morphology in the early growth stage. On the contrary, the nucleation rate of CuTTBPc on the silanized-surface is high and thus a much smoother film comprises densely distributed fine-grain clusters was observed. This fact indicates the higher adhesive force of CuTTBPc molecules to the silanized-surface. On the LB film, the CuTTBPc molecules are arranged in aggregative domains which are separately distributed on the glass surface. These domains act as active sites for the nucleation and growth of the later deposition process and thus, high density clusters were found in the early growth stage. The XRD results demonstrate that the film grown on glass has higher degree of crystalline structure than the others which is resulted from the distinction of the initial growth stage

[en] In order to develop low-temperature-fired soft ferrites used for radio frequency devices, the effects of PbO-CuO glass addition on both the sintering behavior and the magnetic properties of Co₂Z hexagonal ferrite were investigated. PbO-CuO glass, which has a low melting point, can be used as a sintering aid for Co₂Z hexagonal ferrite, reducing the sintering temperature to 950-1000 deg. C. However, either excess addition of glass or too high sintering temperatures produced the secondary phase (M phase) in Co₂Z hexagonal ferrite, which causes the degradation of the magnetic properties. The 90% relative density, initial permeability of 7-8, the highest Q (40-50) at room temperature, and the resonance frequency above 1 GHz were all obtained for the sample with 2 wt% glass addition sintered at 1100 deg. C for 4 h

[en] The characterization of thermal conductivity of the buffer/backfill material is of great importance for dissipating the decay heat of the spent nuclear fuel and safety estimates of disposal site. The buffer/backfill material is usually a kind of complex material, which includes multi composition particles and multi-phase systems in which nearly all the constituents are distributed randomly. Its properties are complicated and that is dependent on all the constituents of material. Therefore, this study’s purpose is to assess the effective thermal conductivity of the Zhihsin clay from Taiwan. First, the matrix material property of Zhihsin clay was obtained by heat transfer, statistics and probability methodology in considering constituents and distribution types. Relative to other bentonites, the effective properties of Zhihsin clay have a higher uncertainty due to the fewer smectite and more complicated compositions. Then, this study takes the matrix material result to estimate the effective values. The ETC of solid of the Zhihsin clay was obtained as normal distribution form N(2.33, 0.07). The results show that the effective values have nonlinear changes under various porosities and saturations. Finally, the equation of the effective thermal conductivity was received by the design of experiment and response surface methodology. In the regression analysis, porosity multiply saturation is one of significant model terms. It represents that the effective thermal conductivity was affected by interaction between porosity and saturation.

[en] The generic structure of our bimeso gens is shown in and for a typical blue-phase mixture of the type we describe here we use mixtures of the ratio 33.4% (n =2.6), 34.1% (n =6.57), 36.6% (n 11.15) with of the high twisted power (HTP) agent BD H1381 (Full text available from Merck Chemicals and described in ref. We then studied the electric-field dependency of the selective reflection in BP I^* at 20.7 degree C by applying increasing and the decreasing pulsed alternating current (a.c.) electric fields (100 Hz)

[en] The phase 1 program of Plant Lifetime Management(PLiM) study had been done in 1996 to evaluate technical, economic and regulatory feasibility of extended operation beyond its design life. PLiMEE was developed to assess the economic benefit of nuclear plant life extension. In this paper the methodology of the PLiMEE and analysis results by it are presented with a review of recent EPRI products of nuclear asset management and future plan on a economic evaluation

[en] There exist multiple branch points in the energy spectrum for some PT-symmetric periodic potentials, where the real eigenvalues turn into complex ones. By studying the transmission amplitude for a localized complex potential, we elucidate the physical origin of the breakdown of the perturbation method and Born approximation. Most importantly, we derive an analytic criterion to determine why, when, and where the bifurcation will occur.

[en] The pressure drop of twelve fuel bundle string in the CANDU-6 fuel channel is equal to the sum of the eleven junction pressure losses, the bundle string entrance and exit pressure losses, the skin friction pressure loss, and other appendage pressure losses, where the junction loss is dependent on the bundle and faces and angular alignments of the junctions. The results of the single junction pressure drop tests in a short rig show that the most probable pressure drop of the eleven junction was analytically equal to the eleven times of average pressure drop of all the possible single junction pressure drops, and also that the largest and smallest junction pressure drops across the eleven junctions probably occurred only with BA and BB type junctions, respectively, where A and B denote the bundle end sides with an end-plates on which a company monogram is stamped and unstamped, respectively. 5 refs., 7 figs., 1 tab. (author)