Results 1 - 10 of 13064
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[en] Lightcurves and UBV photometry of Ceres from the 1975-1976 apparition are presented. The synodic period is 0.37812 + or 0.00004 day, the mean absolute V magnitude is 3.61 + or 0.03, and the phase coefficient is 0.040 + or - 0.001 mag/deg. The U-B and B-V phase coefficients are +0.0015 + or - 0.0007 and +0.0006 + or - 0.0003 mag/deg, respectively. The colors at zero phase are B-V +0.70 + or - 0.01 and U-B +0.41 + or 0.01
[en] The paper concerns the measurable manifestations of 'Berry's phase' in quantum systems. Hannay's angle, Berry's geometric phase, the Aharonov-Bohm effect, rotation of triatomic molecules, and the rotation of a plane of polarisation of light when light travels along optical fibres wound in helices, are also discussed
[en] A multiple-image encryption method based on two-step phase-shifting interferometry (PSI) and spatial multiplexing of a smooth compressed signal is proposed. In the encoding and encryption process, with the help of four index matrices to store original pixel positions, all the pixels of four secret images are firstly reordered in an ascending order; then, the four reordered images are transformed by five-order Haar wavelet transform and performed sparseness operation. After Arnold transform and pixels sampling operation, one combined image can be grouped with the aid of compressive sensing (CS) and spatial multiplexing techniques. Finally, putting the combined image at the input plane of the PSI encryption scheme, only two interferograms ciphertexts can be obtained. During the decoding and decryption, utilizing all the secret key groups and index matrices keys, all the original secret images can be successfully decrypted by a wave-front retrieval algorithm of two-step PSI, spatial de-multiplexing, inverse Arnold transform, inverse discrete wavelet transform, and pixels reordering operation. (paper)
[en] The continuum limit of the Bethe Ansatz solution for an attractive Hubbard chain is considered in which the particle number per site n is kept finite (0< n<1). It is shown that by adjusting the hopping t, the Hubbard U and the lattice constant a in a proper way the excitations connected to unbound electrons will be relativistic with a finite mass. The higher level Bethe Ansatz equations for these particles are given. The spectrum and the phase shifts of these particles show close analogy to those of the massive particles of the SU(2) chiral invariant Gross-Neveu model. (author). Letter-to-the-editor
[en] This paper presents a novel pixel-level resolution 3D profilometry technique that only needs binary phase-shifted structured patterns. This technique uses four sets of three phase-shifted binary patterns to achieve the phase error of less than 0.2%, and only requires two sets to reach similar quality if the projector is slightly defocused. Theoretical analysis, simulations, and experiments will be presented to verify the performance of the proposed technique.