Generation of decoherence-free displaced squeezed states of radiation fields and a squeezed reservoir for atoms in cavity QED

We present a way to engineer an effective anti-Jaynes-Cumming and a Jaynes-Cumming interaction between an atomic system and a single cavity mode and show how to employ it in reservoir engineering processes. To construct the effective Hamiltonian, we analyse considered the interaction of an atomic system in a \{Lambda} configuration, driven by classical fields, with a single cavity mode. With this interaction, we firstly show how to generate a decoherence-free displaced squeezed state for the cavity field. In our scheme, an atomic beam works as a reservoir for the radiation field trapped inside the cavity, as employed recently by S. Pielawa et al. [Phys. Rev. Lett. 98, 240401 (2007)] to generate an Einstein-Podolsky-Rosen entangled radiation state in high-Q resonators. In our scheme, all the atoms have to be prepared in the ground state and, as in the cited article, neither atomic detection nor precise interaction times between the atoms and the cavity mode are required. From this same interaction, we can also generate an ideal squeezed reservoir for atomic systems. For this purpose we have to assume, besides the engineered atom-field interaction, a strong decay of the cavity field (i.e., the cavity decay must be much stronger than the effective atom-field coupling). With this scheme, some interesting effects in the dynamics of an atom in a squeezed reservoir could be tested

Avaliação de variedades de tomateiro sob cultivo protegido em Vilhena, RO.

O objetivo deste trabalho é avaliar variedades de tomateiro predominantemente de grupo multilocular em condições de cultivo protegidobitstream/item/48689/1/COT-170-990001.pd

Short-range interactions in a two-electron system: energy levels and magnetic properties

The problem of two electrons in a square billiard interacting via a finite-range repulsive Yukawa potential and subjected to a constant magnetic field is considered. We compute the energy spectrum for both singlet and triplet states, and for all symmetry classes, as a function of the strength and range of the interaction and of the magnetic field. We show that the short-range nature of the potential suppresses the formation of ``Wigner molecule'' states for the ground state, even in the strong interaction limit. The magnetic susceptibility $\chi(B)$ shows low-temperature paramagnetic peaks due to exchange induced singlet-triplet oscillations. The position, number and intensity of these peaks depend on the range and strength of the interaction. The contribution of the interaction to the susceptibility displays paramagnetic and diamagnetic phases as a function of $T$.Comment: 12 pages,6 figures; to appear in Phys. Rev.

Multidimensional emotional disorders inventory: Reliability and validity in a Spanish clinical sample

Background. The categorical approach to diagnosing mental disorders has been criticized for a number of reasons (e.g., high rates of comorbidity; larger number of diagnostic categories and combination). Diverse alternatives have been proposed using a hybrid or totally dimensional perspective. Despite the evidence supporting use of the Multidimensional Emotional Disorders Inventory (MEDI) for assessing the transdiagnostic dimensions of Emotional Disorders using a dimensional-categorical hybrid approach, no data exist on Spanish clinical samples. The present study explores the validity and reliability of the 49-item MEDI in a clinical sample and provides data for its use. Methods. A total of 280 outpatients with emotional disorders attended in different Spanish public Mental Health Units in Spain filled out all questionnaires during the assessment phase and the MEDI again one week after. The instruments used evaluate four main constructs: personality, mood, anxiety and avoidance. Results. The nine original factors were confirmed and showed adequate reliability (α: 0.66–0.91) and stability (r = 0.76–0.87). No differences in mean scores by sex were presented in any subscale (p ≥ .07). The MEDI subscales correlated significantly with the scales of each of the selected constructs (0.45 < r < 0.76). Limitations. The main limitations of this study were the limited sample size and not being able to count on MEDI scores post-transdiagnostic intervention. Conclusions. The MEDI demonstrates adequate reliability and validity. It allows to assess diverse symptoms efficiently, thus being of interest for clinical studies and practice

Orbital Magnetism in Ensembles of Parabolic Potentials

We study the magnetic susceptibility of an ensemble of non-interacting electrons confined by parabolic potentials and subjected to a perpendicular magnetic field at finite temperatures. We show that the behavior of the average susceptibility is qualitatively different from that of billiards. When averaged over the Fermi energy the susceptibility exhibits a large paramagnetic response only at certain special field values, corresponding to comensurate classical frequencies, being negligible elsewhere. We derive approximate analytical formulae for the susceptibility and compare the results with numerical calculations.Comment: 4 pages, 4 figures, REVTE

Excavation at Aguas Buenas, Robinson Crusoe Island, Chile, of a gunpowder magazine and the supposed campsite of Alexander Selkirk, together with an account of early navigational dividers

Excavations were undertaken of a ruined building at Aguas Buenas, identified as an 18th-century Spanish gunpowder magazine. Evidence was also found for the campsite of an early European occupant of the island. A case is made that this was Alexander Selkirk, a castaway here from 1704 to 1709. Selkirk was the model for Defoe’s Robinson Crusoe. A detailed discussion is given of a fragment of copper alloy identifi ed as being from a pair of navigational dividers

Levantamento semidetalhado dos solos da microbacia do Barro Branco, município de São José do Ubá, Estado do Rio de Janeiro.

O levantamento semidetalhado de solos da microbacia do Barro Branco, no município de São José de Ubá, Rio de Janeiro, teve como objetivos a classificação, o mapeamento e a caracterização física, química e mineralógica dos solos, que constituíram os subsídios básicos para a avaliação da aptidão agrícola das terras. A área da microbacia compreende aproximadamente 580 ha. Utilizou-se como material cartográfico básico, restituição planialtimétrica na escala 1:10.000, com curvas de níveis equidistantes em cinco metros. A partir desta base, foram confeccionados o mapa de declividade e o mapa de formas das vertentes da área, que serviram de base final para o mapa de solos. Utilizou-se a metodologia preconizada pela Embrapa Solos, em todas as fases de execução dos trabalhos de campo, laboratório, escritório. O levantamento permitiu identificar e cartografar as seguintes classes de solos: Argissolo Vermelho Tb Eutrófico típicos, abrúpticos e Sapróliticos; Argissolo Vermelho-Amarelo Tb Distrófico típicos, Lépticos e latossólicos; Argissolo Vermelho-Amarelo Tb Eutrófico típicos e Lépticos, Luvissolo Hipocrômico Órtico Eutrófico típico, Nitossolo Vermelho Eutrófico típico, Gleissolo Háplico Ta Eutrófico típicos e solódicos, Cambissolo Flúvico Tb eutrófico gleico; Cambissolo Háplico Distrófico típico; Neossolo Litólico. As classes de solos acima identificadas foram subdivididas em unidades de mapeamento considerando-se o tipo de horizonte A, características taxonômicas de natureza intermediária, grupamentos texturais, constituição macroclástica, tipos de vegetação e classes de declividade. O produto cartográfico (mapa de Solos) foi elaborado e apresentado na escala 1:10.000, com auxílio do SIG ArcView. Os resultados obtidos constituem subsídios básicos ao projeto Prodetab Aquíferos, tanto para a orientação técnica, como para a instalação e execução de experimentos, bem como para a tomada de decisão e execução de práticas conservacionistas condizentes com a realidade local.bitstream/item/100595/1/BPD-81-Levant-Barro-Branco.pdfContém 1 mapa escala 1:10.000

Ep-CAM (MOC-31) expression in tooth germ and ameloblastoma

Ep-CAM, a transmembrane glycoprotein expressed in most epithelium in normal conditions, has diverse roles in these tissues, including in cell adhesion, proliferation, differentiation, cell cycle regulation, migration and intracellular signaling. It is also over-expressed in most malignant neoplasia, participating in the initiation, progression, and metastatic dissemination of the tumor. The expression and roles of this protein in oral neoplasia, particularly in odontogenic tumors, remain unestablished. The objective of this study consisted in analyzing the expression of this protein in ameloblastoma and tooth germ

New reference ranges for interpreting forced expiratory manoeuvres in infants and implications for clinical interpretation: a multicentre collaboration

The raised volume rapid thoracoabdominal compression (RVRTC) technique is commonly used to obtain full forced expiratory manoeuvres from infants, but reference equations derived from 'in-house' equipment have been shown to be inappropriate for current commercially available devices