198 research outputs found
Quantum and classical correlations in the one-dimensional XY model with Dzyaloshinskii-Moriya interaction
We study the effect of Dzyaloshinskii-Moriya (DM) interaction on pairwise
quantum discord, entanglement, and classical correlation in the anisotropic XY
spin-half chain. Analytical expressions for both quantum and classical
correlations are obtained from the spin-spin correlation functions. We show
that these pairwise quantities exhibit various behaviors in relation to the
relative strengths of the DM interaction, the anisotropy and the magnetic
intensity. We observe non-analyticities of the derivatives of both quantum and
classical correlations with respect to the magnetic intensity at the critical
point, with consideration of the DM interaction.Comment: 18pages, 6figure
Revisiting the quantum Szilard engine with fully quantum considerations
By considering level shifting during the insertion process we revisit the
quantum Szilard engine (QSZE) with fully quantum consideration. We derive the
general expressions of the heat absorbed from thermal bath and the total work
done to the environment by the system in a cycle with two different cyclic
strategies. We find that only the quantum information contributes to the
absorbed heat, and the classical information acts like a feedback controller
and has no direct effect on the absorbed heat. This is the first demonstration
of the different effects of quantum information and classical information for
extracting heat from the bath in the QSZE. Moreover, when the well width
or the temperature of the bath
the QSZE reduces to the classical Szilard engine (CSZE), and the total work
satisfies the relation as obtained by
Sang Wook Kim et al. [Phys. Rev. Lett. 106, 070401 (2011)] for one particle
case.Comment: 17 pages, 3 figures, to be published in Annals of Physics(NY
Spectral self-adaptive absorber/emitter for harvesting energy from the sun and outer space
The sun (~6000 K) and outer space (~3 K) are the original heat source and
sink for human beings on Earth. The energy applications of absorbing solar
irradiation and harvesting the coldness of outer space for energy utilization
have attracted considerable interest from researchers. However, combining these
two functions in a static device for continuous energy harvesting is
unachievable due to the intrinsic infrared spectral conflict. In this study, we
developed spectral self-adaptive absorber/emitter (SSA/E) for daytime
photothermal and nighttime radiative sky cooling modes depending on the phase
transition of the vanadium dioxide coated layer. A 24-hour day-night test
showed that the fabricated SSA/E has continuous energy harvesting ability and
improved overall energy utilization performance, thus showing remarkable
potential in future energy applications.Comment: 15 pages, 4 figure
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Effects of ATPM-ET, a novel κ agonist with partial μ activity, on physical dependence and behavior sensitization in mice
Aim: To investigate the effects of ATPM-ET [(−)-3-N-Ethylaminothiazolo [5,4-b]-N-cyclopropylmethylmorphinan hydrochloride] on physical dependence and behavioral sensitization to morphine in mice. Methods: The pharmacological profile of ATPM-ET was characterized using competitive binding and GTPγS binding assays. We then examined the antinociceptive effects of ATPM-ET in the hot plate test. Morphine dependence assay and behavioral sensitization assay were used to determine the effect of ATPM-ET on physical dependence and behavior sensitization to morphine in mice. Results: The binding assay indicated that ATPM-ET ATPM-ET exhibited a high affinity to both κ- and μ-opioid receptors with Ki values of 0.15 nmol/L and 4.7 nmol/L, respectively, indicating it was a full κ-opioid receptor agonist and a partial μ-opioid receptor agonist. In the hot plate test, ATPM-ET produced a dose-dependent antinociceptive effect, with an ED50 value of 2.68 (2.34–3.07) mg/kg. Administration of ATPM-ET (1 and 2 mg/kg, sc) prior to naloxone (3.0 mg/kg, sc) injection significantly inhibited withdrawal jumping of mice. In addition, ATPM-ET (1 and 2 mg/kg, sc) also showed a trend toward decreasing morphine withdrawal-induced weight loss. ATPM-ET (1.5 and 3 mg/kg, sc) 15 min before the morphine challenge significantly inhibited the morphine-induced behavior sensitization (P<0.05). Conclusion: ATPM-ET may have potential as a therapeutic agent for the treatment of drug abuse
An analytical study of the nocturnal radiative cooling potential of typical photovoltaic/thermal module
Radiative cooling (RC) sees great developments in recent years due to its unique feature of sending waste heat to the cold universe without any additional energy consumption, which is extensively proved in many application scenarios, including its integration into solar installations. The comprehensive solar photovoltaic/thermal (PV/T) technology is becoming popular due to its multi-function and high overall efficiency. The integration of RC into a PV/T collector can further contribute to such merits by adding a night sky cooling function, so a PV/T-RC collector can produce electricity and heat during the daytime and provide cooling energy during the nighttime. Without any structural modification, a flat-plate PV/T collector with a typical glass cover is confirmed to be able to realize a good radiative cooling in the present study. A mathematic model for the nighttime performance evaluation of a typical PV/T module was developed to characterize the nocturnal cooling capacity of the module. Results suggest that the absorber plate can be cooled to nearly 9.5 °C below the ambient air over a consecutive five hours nighttime period. Further parametric studies were carried out to investigate the effect of some key structural and environmental parameters on the radiative cooling performance of the PV/T module. Under some favorable radiative cooling conditions, the absorber plate can realize a stagnation temperature of nearly 11 °C lower than the ambient temperature and reach a maximum cooling power of over 50 W/m2
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