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41.
42.
We report a new kind of experiment in which we generate a known superfluid velocity in a straight tube and directly determine the phase difference across the tube's ends using a superfluid matter wave interferometer. By so doing, we quantitatively verify the relation between the superfluid velocity and the phase gradient of the condensate macroscopic wave function. Within the systematic error of the measurement (approximately 10%) we find nu(s)=Planck's/m4InvertedDeltaphi. 相似文献
43.
非线性流固耦合问题的ALE分步有限元数值方法 总被引:9,自引:0,他引:9
推导了一种基于ALE(Arbitrary Lagrangian-Eulerian,即任意的拉格朗日-欧拉)描述下的带有自由液面不可压液体与运动结构非线性耦合问题的一种有限元数值计算方法,在时间域上采用分步格式计算,这种方法与混合插值方法比较其优点是速度和压力可使用同阶线性插值,给数值计算带来很大方便,将所得到的方法应用到结构与TLD(调谐式(液体阻尼器)装置之间的耦合问题,数值计算结果验证了本文所推导的方法。 相似文献
44.
A. M. R. Schechter R. W. Simmonds R. E. Packard J. C. Davis 《Physica B: Condensed Matter》2000,280(1-4):132-133
We recently reported observation of third sound resonances in superfluid films of pure 3He on a disk-shaped polished copper substrate. From the observed spectra of resonant modes, the third sound speed, the average superfluid density, and information on dissipation were obtained. The film thicknesses studied were larger than or comparable to the superfluid coherence length, which is near 100 nm. We describe preliminary results from efforts aimed at using third sound in thinner films on a substrate which has been coated with a few atomic layers of 4He. 相似文献
45.
46.
Using the new method of constructing the functional path integral in state space, we accomplished the construction of the functional path integral in N(> 2)-dimensional state space, and illustrated it with the example of n = 3 dimensional case that leads to the same results with others. 相似文献
47.
石荠苧不同药用部位总黄酮及微量元素含量的测定 总被引:2,自引:0,他引:2
采用分光光度法测定了石荠芋不同药用部位总黄酮的含量,采用电感耦合等离子发射光谱法测定了其中微量元素的含量。结果表明,叶中总黄酮含量最高,根次之,茎最少;根、茎、叶中均含有Cu、Fe、Mn、Zn、Co等多种人体必需的微量元素,其中Fe含量最高,且叶中明显高于根、茎;3个部位均未检出有害重金属As,而Hg、Pb含量均未超标。该结果可为石荠芋不同药用部位的利用和药材的开发提供科学依据。 相似文献
48.
Harold Froehling J.P. Crutchfield Doyne Farmer N.H. Packard Rob Shaw 《Physica D: Nonlinear Phenomena》1981,3(3):605-617
We describe a method for determining the approximate fractal dimension of an attractor. Our technique fits linear subspaces of appropriate dimension to sets of points on the attractor. The deviation between points on the attractor and this local linear subspace is analyzed through standard multilinear regression techniques. We show how the local dimension of attractors underlying physical phenomena can be measured even when only a single time-varying quantity is available for analysis. These methods are applied to several dissipative dynamical systems. 相似文献
49.
Salma Kiani Richard J. Staples Alan B. Packard 《Acta Crystallographica. Section C, Structural Chemistry》2002,58(12):m593-m595
The dimeric title copper(II) complex, diaqua‐1κO,2κO‐bis[3,9‐dimethyl‐6‐(2‐pyridylmethyl)‐4,8‐diazaundeca‐3,8‐diene‐2,10‐dione dioximato(1?)]‐1k4N2,N4,N8,N10;1:2κ5O2:N2,N4,N8,N10‐dicopper(II) diperchlorate, [Cu2(C17H24N5O2)2](ClO4)2, crystallizes with one Cu atom in a square‐pyramidal environment and the other Cu atom displaying a distorted octahedral coordination. In each case, the four N atoms in the core of the ligand (two imine and two oxime N atoms) form the base of the pyramid, with a water molecule at an apex. The two parts of the dimer are linked by an interaction [2.869 (2) Å] between one of the Cu atoms and one of the oxime O atoms coordinated to the second Cu atom, and also by a hydrogen bond between the apical water molecule on the second Cu atom and the pyridyl N atom from the coordination sphere of the first Cu atom. The pyridyl N atoms of the lariat arms are not coordinated to either of the Cu atoms. Thus, this potentially pentadentate ligand is only tetradentate when coordinated to CuII. 相似文献
50.
Liang Y Packard WE Dow JD Ho H Lapeyre GJ 《Physical review. B, Condensed matter》1993,48(16):11942-11945