22,611 research outputs found
Bilateral Filter: Graph Spectral Interpretation and Extensions
In this paper we study the bilateral filter proposed by Tomasi and Manduchi,
as a spectral domain transform defined on a weighted graph. The nodes of this
graph represent the pixels in the image and a graph signal defined on the nodes
represents the intensity values. Edge weights in the graph correspond to the
bilateral filter coefficients and hence are data adaptive. Spectrum of a graph
is defined in terms of the eigenvalues and eigenvectors of the graph Laplacian
matrix. We use this spectral interpretation to generalize the bilateral filter
and propose more flexible and application specific spectral designs of
bilateral-like filters. We show that these spectral filters can be implemented
with k-iterative bilateral filtering operations and do not require expensive
diagonalization of the Laplacian matrix
Biasing simple choices by manipulating relative visual attention
Several decision-making models predict that it should be possible to affect real binary choices by manipulating the relative amount of visual attention that decision-makers pay to the two alternatives. We present the results of three behavioral experiments testing this prediction. Visual attention is controlled by manipulating the amount of time subjects fixate on the two items. The manipulation has a differential impact on appetitive and aversive items. Appetitive items are 6 to 11% more likely to be chosen in the long fixation condition. In contrast, aversive items are 7% less likely to be chosen in the long fixation condition. The effect is present for primary goods, such as foods, and for higher-order durable goods, such as posters
QCD exotics versus a Standard Model Higgs
The present collider data put severe constraints on any type of new
strongly-interacting particle coupling to the Higgs boson. We analyze the
phenomenological limits on exotic quarks belonging to non-triplet SU(3)_C
representations and their implications on Higgs searches. The discovery of the
Standard Model Higgs, in the experimentally allowed mass range, would exclude
the presence of exotic quarks coupling to it. Thus, such QCD particles could
only exist provided that their masses do not originate in the SM Higgs
mechanism.Comment: 11 pages, 8 figures. One appendix added and references updated.
Results unchanged and more relevant after the recent discovery of a
Higgs-like particle. Matches version to be published in Phys. Rev.
HYDROGEN-BONDED SUPRAMOLECULAR ARRAY IN THE CRYSTAL STRUCTURE OF ETHYL 7-HYDROXY-2-OXO-2H-CHROMENE-3-CARBOXYLATE MONOHYDRATE
Indexación: Web of Science; ScieloThe crystal structure of ethyl 7-hydroxy-2-oxo-2H-chromene-3-carboxylate monohydrate (1), C12H10O5.H2O, was established by X-ray crystallographic analysis. The molecule of the title compound is essentially planar except for the carboxylate substituent group. The crystal packing supramolecular array arises from hydrogen bonds and intermolecular C-H - O=C contacts of the organic molecules and solvent water molecules, with graph-set descriptor R24 (8), R21 (6), R44 ( 20) and C (5) motifs. The water molecules are involved as donors and acceptors. The hydrogen bond and intermolecular interaction network is reinforced by stacking of the sheet through p-p interactions.http://ref.scielo.org/qhfkn
The mesoscopic magnetron as an open quantum system
Motivated by the emergence of materials with mean free paths on the order of
microns, we propose a novel class of solid state radiation sources based on
reimplementing classical vacuum tube designs in semiconductors. Using materials
with small effective masses, these devices should be able to access the
terahertz range. We analyze the DC and AC operation of the simplest such
device, the cylindrical diode magnetron, using effective quantum models. By
treating the magnetron as an open quantum system, we show that it continues to
operate as a radiation source even if its diameter is only a few tens of
magnetic lengths.Comment: 11 pages, 7 figures; submitted to Physical Review Applie
Effect of double bonds on the dynamics of hydrocarbon chains
©1992 American Institute of PhysicsThe electronic version of this article is the complete one and can be found online at: http://link.aip.org/link/?JCPSA6/97/1240/1DOI:10.1063/1.463250Brownian dynamics simulations of isolated 18-carbon chains have been performed, both for
saturated and unsaturated hydrocarbons. The effect of one or several (nonconjugated)
double bonds on the properties of the chains is discussed in terms of both equilibrium and
dynamic properties. The introduction of a cis double bond increases the relaxation
rates of the unsaturated chain with respect to the saturated alkane. On the other hand,
coupling effects in the torsional transitions around a trans double bond make the dynamics of
this unsaturated chain very similar to the saturated one. Based on these results, the
parameters and moves of a dynamic Monte Carlo algorithm are tuned to reproduce the
observed behavior, providing an efficient method for the study of more complicated systems
The assessment of trait emotional intelligence: psychometric characteristics of the TEIQue-full form in a large Italian adult sample
Trait Emotional Intelligence (or trait emotional self-efficacy) is a constellation of emotional perceptions assessed through questionnaires and rating scales (Petrides et al., 2007b). This paper examined the psychometric features of the Trait Emotional Questionnaire Full Form (TEIQue-FF; Petrides, 2009b) in the Italian context. Incremental validity in the prediction of depression and anxiety was also tested with respect to the Big Five. Participants were 1343 individuals balanced for gender (690 females and 653 males) whose mean age was 29.65 years (SD = 13.64, range 17-74 years). They completed a questionnaire battery containing the TEIQue and measures of the Big Five, depression, and anxiety (both trait and state). Results indicated that the performance of the TEIQue-FF in the Italian context was comparable to the original United Kingdom version as regards its reliability and factor structure. Moreover, the instrument showed incremental validity in the prediction of depression and state-trait anxiety after controlling for the Big Five
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