5,127 research outputs found
The big five: Discovering linguistic characteristics that typify distinct personality traits across Yahoo! answers members
Indexación: Scopus.This work was partially supported by the project FONDECYT “Bridging the Gap between Askers and Answers in Community Question Answering Services” (11130094) funded by the Chilean Government.In psychology, it is widely believed that there are five big factors that determine the different personality traits: Extraversion, Agreeableness, Conscientiousness and Neuroticism as well as Openness. In the last years, researchers have started to examine how these factors are manifested across several social networks like Facebook and Twitter. However, to the best of our knowledge, other kinds of social networks such as social/informational question-answering communities (e.g., Yahoo! Answers) have been left unexplored. Therefore, this work explores several predictive models to automatically recognize these factors across Yahoo! Answers members. As a means of devising powerful generalizations, these models were combined with assorted linguistic features. Since we do not have access to ask community members to volunteer for taking the personality test, we built a study corpus by conducting a discourse analysis based on deconstructing the test into 112 adjectives. Our results reveal that it is plausible to lessen the dependency upon answered tests and that effective models across distinct factors are sharply different. Also, sentiment analysis and dependency parsing proven to be fundamental to deal with extraversion, agreeableness and conscientiousness. Furthermore, medium and low levels of neuroticism were found to be related to initial stages of depression and anxiety disorders. © 2018 Lithuanian Institute of Philosophy and Sociology. All rights reserved.https://www.cys.cic.ipn.mx/ojs/index.php/CyS/article/view/275
The golden ratio in Schwarzschild-Kottler black holes
In this paper we show that the golden ratio is present in the
Schwarzschild-Kottler metric. For null geodesics with maximal radial
acceleration, the turning points of the orbits are in the golden ratio . This is a general result which is independent of the value and
sign of the cosmological constant
Stabilization in relation to wavenumber in HDG methods
Simulation of wave propagation through complex media relies on proper
understanding of the properties of numerical methods when the wavenumber is
real and complex. Numerical methods of the Hybrid Discontinuous Galerkin (HDG)
type are considered for simulating waves that satisfy the Helmholtz and Maxwell
equations. It is shown that these methods, when wrongly used, give rise to
singular systems for complex wavenumbers. A sufficient condition on the HDG
stabilization parameter for guaranteeing unique solvability of the numerical
HDG system, both for Helmholtz and Maxwell systems, is obtained for complex
wavenumbers. For real wavenumbers, results from a dispersion analysis are
presented. An asymptotic expansion of the dispersion relation, as the number of
mesh elements per wave increase, reveal that some choices of the stabilization
parameter are better than others. To summarize the findings, there are values
of the HDG stabilization parameter that will cause the HDG method to fail for
complex wavenumbers. However, this failure is remedied if the real part of the
stabilization parameter has the opposite sign of the imaginary part of the
wavenumber. When the wavenumber is real, values of the stabilization parameter
that asymptotically minimize the HDG wavenumber errors are found on the
imaginary axis. Finally, a dispersion analysis of the mixed hybrid
Raviart-Thomas method showed that its wavenumber errors are an order smaller
than those of the HDG method
Cloning of Gaussian states by linear optics
We analyze in details a scheme for cloning of Gaussian states based on linear
optical components and homodyne detection recently demonstrated by U. L.
Andersen et al. [PRL 94 240503 (2005)]. The input-output fidelity is evaluated
for a generic (pure or mixed) Gaussian state taking into account the effect of
non-unit quantum efficiency and unbalanced mode-mixing. In addition, since in
most quantum information protocols the covariance matrix of the set of input
states is not perfectly known, we evaluate the average cloning fidelity for
classes of Gaussian states with the degree of squeezing and the number of
thermal photons being only partially known.Comment: 8 pages, 7 figure
Two-mode squeezed vacuum and squeezed light in correlated interferometry
We study in detail a system of two interferometers aimed to the detection of
extremely faint phase-fluctuations. This system can represent a breakthrough
for detecting a faint correlated signal that would remain otherwise
undetectable even using the most sensitive individual interferometric devices,
that are limited by the shot noise. If the two interferometers experience
identical phase-fluctuations, like the ones introduced by the so called
"holographic noise", this signal should emerge if their output signals are
correlated, while the fluctuations due to shot noise and other independent
contributions will vanish. We show how the injecting quantum light in the free
ports of the interferometers can reduce the photon noise of the system beyond
the shot-noise, enhancing the resolution in the phase-correlation estimation.
We analyze both the use of two-mode squeezed vacuum or twin-beam state (TWB)
and of two independent squeezing states. Our results basically confirms the
benefit of using squeezed beams together with strong coherent beams in
interferometry, even in this correlated case. However, mainly we concentrate on
the possible use of TWB, discovering interesting and probably unexplored areas
of application of bipartite entanglement and in particular the possibility of
reaching in principle surprising uncertainty reduction
Beating the standard quantum limit for binary phase-shift-keying discrimination with a hybrid feed-forward receiver
We propose a hybrid feed-forward receiver (HFFRE) for the discrimination of
binary phase-shift-keyed coherent states based on the appropriate combination
of the displacement feed-forward receiver (DFFRE) and a homodyne-like setup
employing a low-intensity local oscillator and photon-number-resolving
detectors. We investigate the performance of the proposed scheme addressing
also realistic scenarios in the presence of non-unit quantum detection
efficiency, dark counts and a visibility reduction. The present HFFRE
outperforms the DFFRE in all conditions, beating the standard quantum limit in
particular regimes.Comment: 10 pages, 10 figure
Mathematical Modeling and Computation of Channel Flow over Discrete Structures
In this paper mathematical modeling and computation of channel flow over small discrete structures are carried out under some reasonable conditions. A mathematical model for such a flow problem, which is based on a relevant system of partial differential equations and Fourier analysis, is studied using perturbation and nonlinear stability methods, and the resulting flow solutions over two types of discrete structures are computed under both stable and unstable conditions. It was found, in particular, that for a subcritical domain with the Reynolds number R slightly less than its critical value Rc, which is defined as the value below which no disturbances are linearly unstable, the structure leads to a stable steady flow whose modal representations have horizontal scale(s) that are due to those of the structure. On the limiting boundary between the stable and unstable flow, the flow is oscillatory with length scales due to the structure and the critical flow. Larger height of the structure affects the flow more significantly by reducing the subcritical domain for the induced steady flow
Mathematical Modeling and Computation of Channel Flow over Discrete Structures
In this paper mathematical modeling and computation of channel flow over small discrete structures are carried out under some reasonable conditions. A mathematical model for such a flow problem, which is based on a relevant system of partial differential equations and Fourier analysis, is studied using perturbation and nonlinear stability methods, and the resulting flow solutions over two types of discrete structures are computed under both stable and unstable conditions. It was found, in particular, that for a subcritical domain with the Reynolds number R slightly less than its critical value Rc, which is defined as the value below which no disturbances are linearly unstable, the structure leads to a stable steady flow whose modal representations have horizontal scale(s) that are due to those of the structure. On the limiting boundary between the stable and unstable flow, the flow is oscillatory with length scales due to the structure and the critical flow. Larger height of the structure affects the flow more significantly by reducing the subcritical domain for the induced steady flow
Involvement of Prostaglandins in the Pathophysiology of Endometriosis
Prostaglandins are bioactive lipids that possess multiple and diverse functions. In reproductive biology, they are involved in the regulation of ovulation, in endometrial physiology and in the process of menstruation. Furthermore, cyclooxygenases (COX) levels, which are key enzymes for the synthesis of prostaglandins, have been found to be elevated in pathologic, tumoral and inflammatory processes. In endometriosis, prostaglandins are not only implicated in pain, but they are also critical for the establishment as well as for the development of the disease. The high levels of prostaglandin E2 (PGE2) found in the peritoneal fluid from patients with endometriosis, not only favor cellular proliferation by stimulating the activity of aromatase with the consequent estrogen production, but also these estrogens are responsible for enhancing PGE2 synthesis by stimulating COX-2 activity. PGE2 also stimulates angiogenesis and is implicated in the peritoneal immunologic alterations observed in endometriosis. COX-2 inhibitors were and are used in a vast number of preclinical and clinical studies in different types of cancer. In studies conducted both in vitro and in vivo, we have demonstrated that the selective COX-2 inhibitor, celecoxib, was efficient in inhibiting experimental endometriosis. It is important to search for new horizons in endometriosis treatment. Prostaglandins and the enzymes in charge of their synthesis, COXs, represent an attractive target for developing new therapies that attack directly the molecules involved in the causes of this pathology.Fil: Meresman, Gabriela Fabiana. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; ArgentinaFil: Olivares, Carla Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; Argentin
Non-classical correlations in non-Markovian continuous variable systems
We consider two identical and non-interacting harmonic oscillators coupled to
either two independent bosonic baths or to a common bosonic bath. Under the
only assumption of weak coupling, we analyze in details the non-Markovian short
time-scale evolution of intensity correlations, entanglement and quantum
discord for initial two-mode squeezed-thermal vacuum states. In the independent
reservoirs case we observe the detrimental effect of the environment for all
these quantities and we establish a hierarchy for their robustness against the
environmental noise. In the common reservoir case, for initial uncorrelated
states, we find that only quantum discord can be created via interaction with
the bath, while entanglement and sub shot noise intensity correlations remain
absent.Comment: 10 pages, 5 figure
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