2,004 research outputs found
Strongly-Driven One-Atom Laser and Decoherence Monitoring
We propose the implementation of a strongly-driven one-atom laser, based on
the off-resonant interaction of a three-level atom in -configuration
with a single cavity mode and three laser fields. We show that the system can
be described equivalently by a two-level atom resonantly coupled to the cavity
and driven by a strong effective coherent field. The effective dynamics can be
solved exactly, including a thermal field bath, allowing an analytical
description of field statistics and entanglement properties. We also show the
possible generation of Schr\"odinger cat states for the whole atom-field system
and for the field alone after atomic measurement. We propose a way to monitor
the system decoherence by measuring atomic population. Finally, we confirm the
validity of our model through numerical solutions.Comment: 9 pages, 7 figures Accepted in Phys. Rev.
Estimating Parasitism of Colorado Potato Beetle Eggs, \u3ci\u3eLeptinotarsa Decemlineata\u3c/i\u3e (Coleoptera: Chrysomelidae), by \u3ci\u3eEdovum Puttleri\u3c/i\u3e (Hymenoptera: Eulophidae)
A computer simulation was used to evaluate methods for estimating parasitism of Colorado potato beetle egg mass populations by Edovum puttleri. The algorithm incorporated the specific attack behavior of E. puttleri, and a development time for parasitized egg masses of ca. 2.9 times that of healthy egg masses. Of the methods compared, a modification of Southwood\u27s graphical technique was found to be most accurate in relation to the true parasitism derived from the algorithm. A regression equation is presented to correct the error in this method at high levels of parasitism. A second simulation was used to test the accuracy of this correcter where in a jacknife procedure was used to generate a mean and variance for estimates of parasitism
Enfoque sobre o plano de saúde dos empregados da Embrapa no contexto do pacote de benefícios sociais oferecidos pela empresa.
bitstream/item/71547/1/ID-30976.pd
Solvable model of a strongly-driven micromaser
We study the dynamics of a micromaser where the pumping atoms are strongly
driven by a resonant classical field during their transit through the cavity
mode. We derive a master equation for this strongly-driven micromaser,
involving the contributions of the unitary atom-field interactions and the
dissipative effects of a thermal bath. We find analytical solutions for the
temporal evolution and the steady-state of this system by means of phase-space
techniques, providing an unusual solvable model of an open quantum system,
including pumping and decoherence. We derive closed expressions for all
relevant expectation values, describing the statistics of the cavity field and
the detected atomic levels. The transient regime shows the build-up of mixtures
of mesoscopic fields evolving towards a superpoissonian steady-state field
that, nevertheless, yields atomic correlations that exhibit stronger
nonclassical features than the conventional micromaser.Comment: 9 pages, 16 figures. Submitted for publicatio
Executive functions and body weight at different ages: a preliminary study
Recently, researchers have focused their attention on the role of cognitive processes on eating habits and body weight changes. Few studies have examined the relationship between the first stages of overweight and executive functions (EFs), excluding obesity conditions. This study is aimed to detect the involvement of the EFs and their predictive role on body mass index (BMI) in a sample of healthy individuals from childhood to young adulthood with a cross-sectional design. One-hundred and sixty-six healthy students were recruited from different Italian public schools: 46 children (age range: 7–11), 50 adolescents (age range: 15–18), 70 young adults (age range: 19–30). BMI was used to evaluate body weight and different EFs tasks were used to assess the EFs domains of inhibition, updating and shifting. After adjusting BMI for age, a hierarchical multiple linear regression was carried out for each EFs task. Pearson’s r correlations were reported for each of the age subgroups. Motor disinhibition was associated with greater BMI in the overall sample. Higher BMI was related to poorer set-shifting in adolescence and poorer motor inhibition in young adulthood, but higher BMI was not associated with EFs in childhood. Differences in the development of EFs over time may influence weight changes over time through different responses to food and eating behavior
Shear-promoted drug encapsulation into red blood cells: a CFD model and μ-PIV analysis
The present work focuses on the main parameters that influence shear-promoted encapsulation of drugs into erythrocytes. A CFD model was built to investigate the fluid dynamics of a suspension of particles flowing in a commercial micro channel. Micro Particle Image Velocimetry (μ-PIV) allowed to take into account for the real properties of the red blood cell (RBC), thus having a deeper understanding of the process. Coupling these results with an analytical diffusion model, suitable working conditions were defined for different values of haematocrit
EVALUATION OF THE RELIABILITY OF DIFFERENT METHODS FOR THE DETERMINATION OF THE HYDRATION STATUS IN HAEMODIALYSIS PATIENTS
Roots of Ehrhart Polynomials of Smooth Fano Polytopes
V. Golyshev conjectured that for any smooth polytope P of dimension at most
five, the roots z\in\C of the Ehrhart polynomial for P have real part equal
to -1/2. An elementary proof is given, and in each dimension the roots are
described explicitly. We also present examples which demonstrate that this
result cannot be extended to dimension six.Comment: 10 page
Comentario a Historia y Justicia. Cultura, política y sociedad en el Río de la Plata (siglos XVI-XIX), de Darío Barriera. Una lectura desde la historia conceptual del derecho
The present review is an open invitation to encourage reading, crossed by the reflection of conceptual history in the critique of historical concepts, historiographic categories and fields of knowledge in their moment of “institution”. Brief marks that imply considering meta-concepts such as authority, and key concepts such as oeconomy and justice, in the writing of a history of rioplatense justice which Darío Barriera presents in his latest comprehensive work.El presente comentario es una invitación a la lectura, atravesado por la reflexión de la historia conceptual en la crítica de conceptos históricos, categorías historiográficas y campos de saber en su momento de “institución”. Breves marcas que implican considerar metaconceptos como autoridad, y conceptos clave como oeconomía y justicia, en la escritura de una historia de la justicia rioplatense que Darío Barriera presenta en su último trabajo integral
- …