Low-energy excitations of a boson pair in a double-well trap

The states of a boson pair in a one-dimensional double-well potential are investigated. Properties of the ground and lowest excited states of this system are studied, including the two-particle wave function, momentum pair distribution, and entanglement. The effects of varying both the barrier height and the effective interaction strength are investigated.

Bioinformatics inspired algorithm for stereo correspondence

In this paper, we exploit the analogy between protein sequence alignment and image pair correspondence to design a bioinformatics-inspired framework for stereo matching based on dynamic programming. This approach also led to the creation of a meaningfulness graph, which helps to predict matching validity according to image overlap and pixel similarity. Finally, we propose an automatic procedure to estimate automatically all matching parameters. This work is evaluated qualitatively and quantitatively using a standard benchmarking dataset and by conducting stereo matching experiments between images captured at different resolutions. Results confirm the validity of the computer vision/bioinformatics analogy to develop a versatile and accurate low complexity stereo matching algorithm.

Reply (Correspondence)

We appreciate the interest of Galvis and associates in our work.1 It has been suggested that undercorrection of children's refractive error might retard myopia progression. Previous studies,2,3 limited by size, have generally not been consistent with this. We performed a post hoc analysis on data from our large trial of spectacle provision in China and found no evidence of worsening visual acuity (VA) among children randomized to receive glasses compared to controls. In fact, the final uncorrected VA of Treatment Group children was significantly better than that of controls.

St. Catharines Garrison Club correspondence 1899

Correspondence to the St. Catharines Garrison Club from the 19th battalion, Lincoln Regiment related to club meeting space, 1899, signed by John S. Campbell.

The seasons of Zarathustra and their correspondence to the metamorphoses of the spirit

Nietzsche employed metaphors frequently throughout his works. This is especially true in Thus Spoke Zarathustra. Although this is often aesthetically pleasing, it can be very difficult for the reader to understand the nuances and interconnections with the various metaphors. This is generally considered one of the main drawbacks of Thus Spoke Zarathustra. While it is beautifully written in a style that is incomparable today, much of what it is attempting to communicate is lost on the reader. This thesis explores the connection between the metamorphoses of the spirit and the seasons in Thus'Spoke Zarathustra, with the camel spirit corresponding to autumn, the lion spirit with winter, the child spirit with spring, and finally the Overman with summer. Although the Overman is not included among the three metamorphoses of the spirit, it will be argued that the Overman is a separate metamorphosis and must not be conflated with the child spirit despite their similarities. While Thus Spoke Zarathustra will be the primary text used, Nietzsche's other works will be employed to demonstrate that this connection between the metamorphoses of the spirit and the seasons runs through much of his thought. By demonstrating how the seasons are used in Thus Spoke Zarathustra, a deeper understanding of the work will be revealed. Further, this thesis will demonstrate that it is an intentional connection, and not merely coincidental or something that has been constructed and imposed upon the work. Bringing this correspondence between the metamorphoses of the spirit and the seasons to light will result in the need to rethink particular notions of Nietzsche's philosophy. The most apparent involves the Overman and the process of overcoming. Although the Overman has often been viewed as "the end" in the cycle of metamorphoses, it will be argued that this is not the case. The typical interpretation of the metamorphoses of the spirit regard it as a linear progression; however, it will be shown that the metamorphoses of the spirit is cyclical with the camel, lion, and child spirits endlessly repeating, much like the seasons.

Calculation of the optical conductivity for the Anderson impurity model using the slave boson technique

The optical conductivity of the Anderson impurity mode l has been calculated by emp l oying the slave boson technique and an expansion in powers of l i N, where N is the d egeneracy o f the f electron level . This method has been used to find the effective mass of the conduction electrons for temperatures above and below the Kondo tempera ture. For low temperatures, the mass enhancement is f ound to be large while a t high t emperatures, the mass enhancement is sma ll. The conductivity i s f ound to be Drude like with frequency dependent effective mass and scattering time for low independent effective mass and temperatures and scattering time f requency for high t emperatures. The behavior of both the effective mass and the conductivity is in qualitative agreement with experimental r esul t s .

Far-infrared optical properties of the heavy fermion superconductor UB[E13]

Temperature dependent resistivity, p, magnetic susceptibility, X, and far-infrared reflectance measurements were made on the low Tc superconductor UBe13. Two variants of UBe13 have been proposed, named 'L'- (for low Tc ) and 'H'-type (for high Tc ). Low temperature resistivity measurements confirmed that our sample was of H-type and that the transition temperature was at 0.9 K. This was further confirmed with the observation of this transition in the AC-susceptibility. Low temperature reflectance measurements showed a decrease in the reflectivity as the temperature is lowered from 300 to 10 K, which is in qualitative agreement with the increasing resistivity in this temperature range as temperature is lowered. No dramatic change in the reflectivity was observed between 10 and 0.75 K. A further decrease of the reflectance was observed for the temperature of 0.5 K. The calculated optical conductivity shows a broad minimum near 80 cm-1 below 45 K. Above 45 K the conductivity is relatively featureless. As the temperature is lowered, the optical conductivity decreases. The frequency dependent scattering rate was found to be flat for temperatures between 300 and 45 K. The development of a peak, at around 70 cm-1 was found for temperatures of 45 K and below. This peak has been associated with the energy at which the transition to a coherent state occurs from single impurity scattering in other heavy fermion systems. The frequency dependent mass enhancement coefficient was found to increase at low frequencies as the frequency decreases. Its' magnitude as frequency approaches zero also increased as the temperature decreased.

Far infrared spectroscopy of heavy fermion superconductor CeCoIn5

The optical response to far infrared radiation has been measured on a mosaic of heavy fermion CeColnssingle crystals. The superconducting transition temperature of the crystals has been determined by van der Pauw resistivity and ac-susceptibility measurements as Tc = 2.3 K. The optical measurements were taken above and below the transition temperature using a 3He cryostat and step and integrate Martin-Puplett type polarizing interferometer. The absolute reflectance of the heavy fermion CeColns in the superconducting state in range (0, 100)cm-1 was calculated from the measured thermal reflectance, using the normal state data of Singley et al and a low frequency extrapolation for a metallic material in the Hagen-Rubens regime. By means of Kramers-Kronig analysis the absolute reflectance was used to calculate the optical conductivity of the sample. The real part of the calculated complex conductivity 0-(w) ofCeColns indicates a possible opening of an energy gap close to 50 em-I.

Far infrared spectroscopy of heavy fermion superconductor CeCoIn5 /

The optical response to far infrared radiation has been measured on a mosaic of heavy fermion CeCoIns single crystals. The superconducting transition temperature of the crystals has been determined by van der Pauw resistivity and ac-susceptibility measurements as Tc = 2.3 K. The optical measurements were taken above and below the transition temperature using a ^He cryostat and step and integrate Martin-Puplett type polarizing interferometer. The absolute reflectance of the heavy fermion CeCoIns in the superconducting state in range (0, 100)cm~^ was calculated from the measured thermal reflectance, using the normal state data of Singley et al and a low frequency extrapolation for a metallic material in the Hagen-Rubens regime. By means of Kramers-Kronig analysis the absolute reflectance was used to calculate the optical conductivity of the sample. The real part of the calculated complex conductivity a{u)) of CeCoIns indicates a possible opening of an energy gap close to 50 cm~^.

Analysis of the late correspondence between our administration and Great Britain & France, with an attempt to show what are the real causes of the failure of the negotiation.

Ten pieces originally published in the Columbian Centinel. A later edition with imprint New York, Printed for E. Sargeant, 1809, contains two additional pieces.

An appeal to the people ; being a review of the late correspondence and documents, relating to the rejection of the British Minister : including an examination of the "arrangement" of April last /

Introduction "To the people of the United States" signed Wm. Coleman.

The citizen soldiers at North Point and Port McHenry, September 12 & 13, 1814. Resolves of the citizens in town meeting, particulars relating to the battle, official correspondence and honorable discharge of the troops. Also, celebration of the seventy-fifth anniversary, 1889. Reprint. --

First edition printed by Nathaniel Hickman.