Analysis of the low—lying spectrum of the He—tetramer

There is a type of nodal surface imposed by symmetry on wavefunctions.These surfaces are crucial to the ordering of low-lying states.Based on an analysis of this type of surface and based on existing theoretical results,the feature of the low-lying spectrum of the He-tetramer is studied,and the candidates of bound states and narrow resonances are suggested.     

Experimental study of the Plasma Fluorination of Y—Ba—Cu—O Thin Films

We have experimentally studied the surface mjodifications of Y-Ba-Cu-O (YBCO) thin films using CF4 plasma.The intensity of the plasma fluorination was controlled by controlled by changing the biasing voltage and the time of the plasma treatment.Microstructural analyses reveal that the oxygen content of the YBCO thin films was changed.Transport measurements of sufficient fluorinated YBCO films imply that the films changed totally into an oxygen-deficient semi-conducting state.From these experimental results,we believe that plasma fluorination is quite a useful method to form controllable a thin barrier layer in fabricating interface engineered junctions and to form a stable narrow weak-link region in fabricating planar superconductor-normal-superconductor junctions.     

Entanglement of the Common Eigenvector of Two Particles‘ Center—of—Mass Coordinate and Mass—Weighted Relative Momentum

We reveal that the common eigenvector of two particles‘ center-of-mass coordinate and mass-weighted relative momentum is an entangled state.Its Schmidt decomposition exhibits that the entanglement involves squeezing which depends on the ration of two particles‘ masses.The corresponding entangling operators are derived.     

Theoretical Analysis of Ionic Autoionization Spectra of Lanthanum in the Energy Region of 90650—915—00cm^—1

Eigenquantum defects μα and transformation matrix Uiα of La are calculated from the first principles byrelativistic multichannel theory, and dipole matrix elements Dα are obtained by fitting the experimental spectra.With these parameters, ionic autoionization spectra of lanthanum via an intermediatestate (Xe)5d6d^-1 P1 of La . in the energy region of 90650-91500 cm^-1 are calculated within the framework of multichannel auantum defecttheory. Our calculated spectra are in general agreement with the experimental data.     

Numerical Simulation of the Two—State Decoherence Model of Nano—Spin Systems

We have studied the two-state random decoherence model of the V15 system (Phys.Rev.Lett.84(2000)3458) with the k‘partial tracing of the environment’ method.The linearity relation between the averaged decoherence time and the random dipolar interaction amplitude is verified.The distribution function of decoherence time spreads more widely as the amplitude of the random field is decreased,hence it is difficult to define a decoherence time for the system.     

Strain behavior of Fe—Ni—C martensite

This article examines the effect of carbon on the structure of slip traces and characteristics of the deformation resistance of quenched iron-nickel-carbon alloys deformed at 77°K. It is established that an increase in the carbon concentration in the martensite within the range 0.03–0.30 wt. % is accompanied by the formation of channels of easy slip during low-temperature deformation, which explains the simultaneously observed increase in the plastic strain of the alloys. Localization of slip in these channels leads to a reduction in the nonconservative component of resistance to deformation.Translated from Izvestiya Vysshikh Uchehnykh Zavedenii, Fizika, No. 6, pp, 33–38, June, 1985.     

Vibration control of multi—degrees—of—freedom system with dynamic absorbers based on power flow

In accordance with a multiple degrees of freedom vibration system with dynamic vibration absorbers (DVAs), an equivalent admittance matrix and the power flows input major structure and minor structure are deduced on the basis of the theories of structure mobility.Furthermore, regarding the net power flow of main vibration system as the controlled object,probed into are the single and multiple model controls of multi-degrees-of-freedom system with one or several absorbers attached. And the control mechanism and effect of dynamic vibration absorbers are revealed.