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Phosrestin I, an arrestin homolog that undergoes light-induced phosphorylation in dipteran photoreceptors

Komori, N. ; Usukura, J. ; Kurien, B. ; [et al.]

Amsterdam : Elsevier

Insect Biochemistry and Molecular Biology 24 (1994), S. 607-617

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ISSN: 0965-1748

Keywords: Arrestin homolog ; Drosophila ; Musca ; Phosrestin I ; Photoreceptor

Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Topics: Biology

Type of Medium: Electronic Resource

URL: http://linkinghub.elsevier.com/retrieve/pii/0965-1748(94)90097-3

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Solution of three-dimensional natural convection about a vertical square rod in a cylindrical enclosure (1987)

Glakpe, E. K. ; Watkins, C. B. ; Kurien, B.

Chichester : Wiley-Blackwell

International Journal for Numerical Methods in Fluids 7 (1987), S. 155-173

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ISSN: 0271-2091

Keywords: Cavity Flow ; Three-dimensional ; Primitive Variables ; Navier-Stokes Equations ; Boundary-fitted Co-ordinates ; SIMPLE Solution Scheme ; Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: The problem of three-dimensional laminar natural convection in a vertical enclosure with an inner square rod is treated by a numerical method in boundary-fitted co-ordinates. The inner and outer cylinders are heated and cooled, respectively, to maintain different constant surface temperatures. The horizontal enclosure surfaces are maintained at adiabatic conditions. The Prandtl number is that of air, 0·703, and the Rayleigh numbers span the conduction, transition and boundary layer regimes of flow. The radius ratio is 1, and the aspect ratio (cylinder length divided by maximum annular gap) is 1. The results of the study provide data useful in the design and performance assessment of nuclear reactor spent fuel shipping casks.

Additional Material: 18 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/fld.1650070205

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Resolving phase ambiguities in the calibration of redundant interferometric arrays: implications for array design (2016)

Kurien, B. G., Tarokh, V., Rachlin, Y., Shah, V. N., Ashcom, J. B.

Oxford University Press

In: Monthly Notices of the Royal Astronomical Society

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Publication Date: 2016-07-22

Description: We provide new results enabling robust interferometric image reconstruction in the presence of unknown aperture piston variation via the technique of redundant spacing calibration (RSC). The RSC technique uses redundant measurements of the same interferometric baseline with different pairs of apertures to reveal the piston variation among these pairs. In both optical and radio interferometry, the presence of phase-wrapping ambiguities in the measurements is a fundamental issue that needs to be addressed for reliable image reconstruction. In this paper, we show that these ambiguities affect recently developed RSC phasor-based reconstruction approaches operating on the complex visibilities, as well as traditional phase-based approaches operating on their logarithm. We also derive new sufficient conditions for an interferometric array to be immune to these ambiguities in the sense that their effect can be rendered benign in image reconstruction. This property, which we call wrap-invariance , has implications for the reliability of imaging via classical three-baseline phase closures as well as generalized closures. We show that wrap-invariance is conferred upon arrays whose interferometric graph satisfies a certain cycle-free condition. For cases in which this condition is not satisfied, a simple algorithm is provided for identifying those graph cycles which prevent its satisfaction. We apply this algorithm to diagnose and correct a member of a pattern family popular in the literature.

Print ISSN: 0035-8711

Electronic ISSN: 1365-2966

Topics: Physics

Published by Oxford University Press

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Robust interferometric imaging via prior-less phase recovery: redundant spacing calibration with generalized-closure phases (2016)

Kurien, B. G., Ashcom, J. B., Shah, V. N., Rachlin, Y., Tarokh, V.

Oxford University Press

In: Monthly Notices of the Royal Astronomical Society

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Publication Date: 2016-11-05

Description: Atmospheric turbulence presents a fundamental challenge to Fourier phase recovery in optical interferometry. Typical reconstruction algorithms employ Bayesian inference techniques which rely on prior knowledge of the scene under observation. In contrast, redundant spacing calibration (RSC) algorithms employ redundancy in the baselines of the interferometric array to directly expose the contribution of turbulence, thereby enabling phase recovery for targets of arbitrary and unknown complexity. Traditionally RSC algorithms have been applied directly to single-exposure measurements, which are reliable only at high photon flux in general. In scenarios of low photon flux, such as those arising in the observation of dim objects in space, one must instead rely on time-averaged, atmosphere-invariant quantities such as the bispectrum. In this paper, we develop a novel RSC-based algorithm for prior-less phase recovery in which we generalize the bispectrum to higher order atmosphere-invariants (n-spectra) for improved sensitivity. We provide a strategy for selection of a high-signal-to-noise ratio set of n-spectra using the graph-theoretic notion of the minimum cycle basis. We also discuss a key property of this set (wrap-invariance), which then enables reliable application of standard linear estimation techniques to recover the Fourier phases from the 2-wrapped n-spectra phases. For validation, we analyse the expected shot-noise-limited performance of our algorithm for both pairwise and Fizeau interferometric architectures, and corroborate this analysis with simulation results showing performance near an atmosphere-oracle Cramer–Rao bound. Lastly, we apply techniques from the field of compressed sensing to perform image reconstruction from the estimated complex visibilities.

Print ISSN: 0035-8711

Electronic ISSN: 1365-2966

Topics: Physics