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1.
Bernard Otterman Shao-Lin Lee 《Zeitschrift für Angewandte Mathematik und Physik (ZAMP)》1969,20(5):730-749
Zusammenfassung Die laminare Mischung von zwei Flüssigkeitsströmen wird untersucht, von denen der eine Suspensionsteilchen mitführt, während der andere ursprünglich rein ist. Berücksichtigt wird der Schlupf, sowie die in der Scherströmung auftretende Querkraft auf die Teilchen. Störungslösungen werden für den Anfang der Mischzone, sowie für die weit stromabwärts liegenden Gebiete angegeben; diese beschreiben das Geschwindigkeitsfeld beider Phasen, den Phasenschlupf, sowie die Teilchenkonzentration. 相似文献
2.
利用在网格内恰当选取特征线上插值点的技巧,提出了一种新型的求解对流扩散方程的特征差分方法,并给出了稳定性与收敛性分析.该方法避免了数值扩散的产生,同时具有O(τ h~2)阶的收敛阶.数值实验表明,该方法是一个高效、稳定和收敛的数值方法. 相似文献
3.
An electrochemical study of structurally-integrated xLi2MnO3•(1 −x)LiMn0.5Ni0.5O2 ‘composite’ materials has been undertaken to investigate the stability of electrochemically-activated electrodes at the Li2MnO3-rich end of the Li2MnO3–LiMn0.5Ni0.5O2 tie-line, i.e., for 0.7 ≤ x ≤ 0.95. Excellent performance was observed for x = 0.7 in lithium half-cells; comparable to activated electrodes that have significantly lower values of x and are traditionally the preferred materials of choice. Electrodes with higher manganese content (x ≥ 0.8) showed significantly reduced performance. Implications for stabilizing low-cost, manganese-rich, layered lithium-metal-oxide electrode materials are discussed. 相似文献
4.
《Nuclear Physics B》1988,298(3):445-457
To clarify the status of proposed causality arguments limiting the annihilation rate of monopoles, we present a three-dimensional model for the formation of monopoles connected by strings. The length distribution of the strings has been found using a Monte carlo simulation of the phase transition. The result is that long strings connecting monopoles are exponentially suppressed in agreement with the theoretical predictions of Mitchell and Turok [1]. The implications of our results for the monopole problem are discussed. 相似文献
5.
《Nuclear Physics B》1986,274(1):225-252
The validity of the flavour interpretation of staggered fermions is discussed in terms of the discrete symmetries of the interaction terms. Some aspects of the embedding of these symmetries in the symmetry group of the continuum limit are clarified. An explicit calculation, at first non-trivial order in 1/N, of the four-point function for a latticized Gross-Neveu model yields the same result in the continuum limit as the continuum theory for 2N fermions. A proof is then given that flavour and C, P, and T symmetries are restored in the continuum limit of 2-point correlation functions, for interactions, including the case of 4-dimensional QCD, which respect the discrete symmetries of the free action. 相似文献
6.
《Optics Communications》1986,58(6):379-384
Using a combination of linear polarization filters, a new method to generate the optical Hilbert transform (OHT) is described. Linear polarizers, acting as knife-edge filters in the spatial frequency plane and together with an image plane analyzer, can produce at the output, the input signal, its analytical function and its OHT. Both one and two dimensional, also angularly anisotropic and isotropic, OHTs are discussed. With a white light source, this method also produces a white light HT (WHT). 相似文献
7.
《Annals of Physics》1962,17(3):426-435
The problem of Rainich for null fields is examined, and it is found that for particular geometries the electromagnetic field is not unique. In the special case where the propagation and polarization vectors are harmonic, the geometry admits an electromagnetic potential which excludes the existence of magnetic monopoles. An explicit solution for a null electromagnetic plane wave of arbitrary pulse shape is obtained. It is found that there is generated no gravitational field external to the pulse. 相似文献
8.
《Nuclear Physics A》1968,120(1):126-134
The bremsstrahlung of electrons from a linear accelerator has been used to excite two levels of 6Li. From self-absorption measurements, we obtain the following width: Λγ(3.56MeV) = 4.6±0.4 eV and from a scattering experiment Λγ(2.18) < μeV. As a check on the apparatus and method, the well-known widths of two levels in 11B and 28Si have been measured. 相似文献
9.
《Journal of magnetism and magnetic materials》1999,192(3):467-472
High solid-solubility Co15Cu85 alloys have been prepared by melt spinning and submitted to isothermal and anisothermal annealing to obtain granular alloys. The X-ray diffraction (XRD) patterns were measured to investigate the decomposition of supersaturated solid solution induced by annealing. The atomic diffusion and structural evolution during the heat treatment were investigated. In view of the problems limiting their application, the high-field magnetization curves were measured. By a fit to the high-field magnetization curves, the granular alloys are found hard to be magnetically saturated at the early stage of nucleation and growth. The magnetization behavior was correlated to the annealed-induced structural evolution and also to the magnetoresistance effect. 相似文献
10.