4,084 research outputs found
Mutual information between reflected and transmitted speckle images
We study theoretically the mutual information between reflected and
transmitted speckle patterns produced by wave scattering from disordered media.
The mutual information between the two speckle images recorded on an array of N
detection points (pixels) takes the form of long-range intensity correlation
loops, that we evaluate explicitly as a function of the disorder strength and
the Thouless number g. Our analysis, supported by extensive numerical
simulations, reveals a competing effect of cross-sample and surface spatial
correlations. An optimal distance between pixels is proven to exist, that
enhances the mutual information by a factor Ng compared to the single-pixel
scenario.Comment: 5 pages, 4 figures, + S
Designing new customer experiences: a study of socio-material practices in service design
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Correlations between reflected and transmitted intensity patterns emerging from opaque disordered media
The propagation of monochromatic light through a scattering medium produces
speckle patterns in reflection and transmission, and the apparent randomness of
these patterns prevents direct imaging through thick turbid media. Yet, since
elastic multiple scattering is fundamentally a linear and deterministic
process, information is not lost but distributed among many degrees of freedom
that can be resolved and manipulated. Here we demonstrate experimentally that
the reflected and transmitted speckle patterns are correlated, even for opaque
media with thickness much larger than the transport mean free path, proving
that information survives the multiple scattering process and can be recovered.
The existence of mutual information between the two sides of a scattering
medium opens up new possibilities for the control of transmitted light without
any feedback from the target side, but using only information gathered from the
reflected speckle.Comment: 6 pages, 4 figure
Salivary gland-specific <i>P. berghei</i> reporter lines enable rapid evaluation of tissue-specific sporozoite loads in mosquitoes
Malaria is a life-threatening human infectious disease transmitted by mosquitoes. Levels of the salivary gland sporozoites (sgs), the only mosquito stage infectious to a mammalian host, represent an important cumulative index of <i>Plasmodium</i> development within a mosquito. However, current techniques of sgs quantification are laborious and imprecise. Here, transgenic <i>P. berghei</i> reporter lines that produce the green fluorescent protein fused to luciferase (GFP-LUC) specifically in sgs were generated, verified and characterised. Fluorescence microscopy confirmed the sgs stage specificity of expression of the reporter gene. The luciferase activity of the reporter lines was then exploited to establish a simple and fast biochemical assay to evaluate sgs loads in whole mosquitoes. Using this assay we successfully identified differences in sgs loads in mosquitoes silenced for genes that display opposing effects on <i>P. berghei</i> ookinete/oocyst development. It offers a new powerful tool to study infectivity of <i>P. berghei</i> to the mosquito, including analysis of vector-parasite interactions and evaluation of transmission-blocking vaccines
Effects of Sound Symbolism in Names on Personality Perception
We investigated effects of sound symbolism in names on personality perception. Participants were randomly assigned to a group that either had invented or non-invented round or sharp names. They were asked to fill out a BFI-10 and a BSRI-12 questionnaire for five different names followed by reading 10 descriptions of personality traits and circling either a round name or a sharp name that fit the description best. Results showed that sound type present in names affected perceptions of Extraversion and that name and sound type affected perceptions of Femininity. These results provide evidence of sound symbolic associations present in names
Fermiophobic and other non-minimal neutral Higgs bosons at the LHC
The phenomenology of neutral Higgs bosons from non--SUSY, extended Higgs
sectors is studied in the context of the LHC, with particular attention given
to the case of a fermiophobic Higgs. It is found that enhanced branching ratios
to and are possible and can provide clear
signatures, while detection of a fermiophobic Higgs will be problematic beyond
a mass of 130 GeV.Comment: 16 pages, Latex, 5 figure
Three-Body approach to the K^- d Scattering Length in Particle Basis
We report on the first calculation of the scattering length A_{K^-d} based on
a relativistic three-body approach where the two-body input amplitudes coupled
to the Kbar N channels have been obtained with the chiral SU(3) constraint, but
with isospin symmetry breaking effects taken into account. Results are compared
with a recent calculation applying a similar set of two-body amplitudes,based
on the fixed center approximation, considered as a good approximation for a
loosely bound target, and for which we find significant deviations from the
exact three-body results. Effects of the hyperon-nucleon interaction, and
deuteron -wave component are also evaluated.Comment: 5 pages, Submitted to Phys. Rev.
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