387 research outputs found
Decoherence of Einstein-Podolsky-Rosen steering
We consider two systems A and B that share Einstein-Podolsky-Rosen (EPR)
steering correlations and study how these correlations will decay, when each of
the systems are independently coupled to a reservoir. EPR steering is a
directional form of entanglement, and the measure of steering can change
depending on whether the system A is steered by B, or vice versa. First, we
examine the decay of the steering correlations of the two-mode squeezed state.
We find that if the system B is coupled to a reservoir, then the decoherence of
the steering of A by B is particularly marked, to the extent that there is a
sudden death of steering after a finite time. We find a different directional
effect, if the reservoirs are thermally excited. Second, we study the
decoherence of the steering of a Schr\"odinger cat state, modeled as the
entangled state of a spin and harmonic oscillator, when the macroscopic system
(the cat) is coupled to a reservoir
Guzmán el Bueno : drama en cuatro actos
Copia digital. Valladolid : Junta de Castilla y León. Consejería de Cultura y Turismo, 2009-201
Formalización de la propiedad informal urbana y calidad de vida urbana de beneficiarios distrito de Trujillo, 2021
La presente investigación tuvo como objetivo determinar la relación entre
Formalización de la propiedad informal urbana y Calidad de vida urbana, de
beneficiarios distrito de Trujillo 2021. Investigación de tipo aplicada, de enfoque
cuantitativo, diseño no experimental, de corte transversal y descriptivo
correlacional. En esta investigación se utilizó la técnica de la encuesta, con
instrumento de recolección de información al cuestionario, conformado por 34
preguntas debidamente validado por expertos, y con escala de medición ordinal tipo
Likert, aplicada a una muestra de 93 beneficiarios titulados de las diferentes
posesiones y centros urbanos informales del distrito de Trujillo, que han concluido
con la formalización de la propiedad vía Prescripción Adquisitiva de Dominio
Integral, por la Municipalidad Provincial de Trujillo a través de la Gerencia del Plan
de Desarrollo Territorial. Los resultados obtenidos fueron sometidos al análisis
estadístico de programas informáticos como Excel y SPPSS versión 26,
determinando que, de acuerdo a la prueba no paramétricas de Spearman, que
obtuvo el coeficiente de correlación de 0.497, y el valor de significancia p=0.001
(p<0.50), se puede determinar que Formalización de la propiedad informal urbana
y Calidad de vida urbana, tienen relación directa positiva de magnitud moderada
Dynamics of fluctuations in a fluid below the onset of Rayleigh-B\'enard convection
We present experimental data and their theoretical interpretation for the
decay rates of temperature fluctuations in a thin layer of a fluid heated from
below and confined between parallel horizontal plates. The measurements were
made with the mean temperature of the layer corresponding to the critical
isochore of sulfur hexafluoride above but near the critical point where
fluctuations are exceptionally strong. They cover a wide range of temperature
gradients below the onset of Rayleigh-B\'enard convection, and span wave
numbers on both sides of the critical value for this onset. The decay rates
were determined from experimental shadowgraph images of the fluctuations at
several camera exposure times. We present a theoretical expression for an
exposure-time-dependent structure factor which is needed for the data analysis.
As the onset of convection is approached, the data reveal the critical
slowing-down associated with the bifurcation. Theoretical predictions for the
decay rates as a function of the wave number and temperature gradient are
presented and compared with the experimental data. Quantitative agreement is
obtained if allowance is made for some uncertainty in the small spacing between
the plates, and when an empirical estimate is employed for the influence of
symmetric deviations from the Oberbeck-Boussinesq approximation which are to be
expected in a fluid with its density at the mean temperature located on the
critical isochore.Comment: 13 pages, 10 figures, 52 reference
Guzmán el Bueno : drama en cuatro actos
Copia digital. Valladolid : Junta de Castilla y León. Consejería de Cultura y Turismo, 2009-201
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