2,757 research outputs found
Radiometric correction procedure study
A comparison of MSS radiometric processing techniques identified as a preferred radiometric processing technique a procedure which equalizes the mean and standard deviation of detector-specific histograms of uncalibrated scene data. Evaluation of MSS calibration data demonstrated that the relationship between detector responses is essentially linear over the range of intensities typically observed in MSS data, and that the calibration wedge data possess a high degree of temporal stability. An analysis of the preferred radiometric processing technique showed that it could be incorporated into the MDP-MSS system without a major redesign of the system, and with minimal impact on system throughput
Elasticity of smectic liquid crystals with focal conic domains
We study the elastic properties of thermotropic smectic liquid crystals with
focal conic domains (FCDs). After the application of the controlled preshear at
different temperatures, we independently measured the shear modulus G' and the
FCD size L. We find out that these quantities are related by the scaling
relation G' ~ \gamma_{eff}/L where \gamma_{eff} is the effective surface
tension of the FCDs. The experimentally obtained value of \gamma_{\rm eff}
shows the same scaling as the effective surface tension of the layered systems
\sqrt{KB} where K and B are the bending modulus and the layer compression
modulus, respectively. The similarity of this scaling relation to that of the
surfactant onion phase suggests an universal rheological behavior of the
layered systems with defects.Comment: 14 pages, 7 figures, accepted for publication in JPC
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