Results 281 to 290 of about 4,740,864 (321)

Inhomogeneous Refractive Index in the Crystalline Cone of a Moth Eye

Nature, 1971
FROM investigations of arthropod compound eyes, Exner concluded that a dioptric effect in each ommatidium was due not only to the curved surfaces of the corneal facet and the cone tip, but also to a specific decrease of refractive index from the axis to the periphery of the dioptric apparatus1,2.
Kunze, P., Hausen, K.
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Manipulating the flow of light using Dirac-cone zero-index metamaterials

Reports on progress in physics. Physical Society, 2018
Metamaterials with a refractive index of zero exhibit properties that are important for integrated optics. Possessing an infinite effective wavelength and zero spatial phase change, zero-index metamaterials may be especially useful for routing on-chip ...
Daryl I. Vulis, O. Reshef, P. Camayd-Muñoz, E. Mazur   +3 more
semanticscholar   +1 more source

Refractive Index Gradients in Sunfish Cones

1997
Jay Enoch’s pioneering work with whole-mounted retinas established that vertebrate photoreceptors behave as dielectric waveguides. Theoretical analyses lead to the expectation that the distribution of refractive index in the photoreceptor inner segment will affect its waveguiding behavior. To determine the distribution of refractive indices in isolated
Mickey P. Rowe, Nader Engheta, Joseph M. Corless, Edward N. Pugh   +3 more
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Scanning interferometry of sunfish cones I Longitudinal variation in single-cone refractive index

Journal of the Optical Society of America A, 1996
Interferometric measurements of cone inner segment–cone outer segments (CIS–COS’s) isolated from the green sunfish (Lepomis cyanellus) were made with a He–Ne laser focused to a 0.3-μm spot. Multiple measurements were obtained by moving the spot across the CIS–COS’s in a raster pattern; adjacent measurements were spaced approximately 0.2 μm apart.
M. P. Rowe, J. M. Corless, N. Engheta, E. N. Pugh   +3 more
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Estimation of Optimal Cone Index by Using Neural Networks

Arabian Journal for Science and Engineering, 2021
Rolling resistance is considered as a significant criterion in vehicles energy consumption. In off-road vehicles, soil and tire interaction encompasses more parameters that lead to the thorny problem in its analysis. The typical experimental models are useful remedies in the estimation perspective, but they can not be extended to all conditions. Neural
Sajjad Derafshpour, Morteza Valizadeh, Aref Mardani   +2 more
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An active index algorithm for the nearest point problem in a polyhedral cone

Computational Optimization and Applications, 2009
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Zhe Liu 0009, Yahya Fathi
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Residual Tillage Effects as Determined by Cone Index

Transactions of the ASAE, 1982
ABSTRACT CONE index values indicated that the residual effec-tiveness of in-row subsoiling was evident for one additional year but was not detectable beyond 2 yr in a Coastal Plain soil. Recompaction of soil occurred using either no-till or moldboard tillage, with no-till resulting in a loss of 50 percent of the potential root zone compared to ...
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Real-time measurement of cone index in a soil bin

Computers and Electronics in Agriculture, 1993
Abstract A personal computer-based measurement and control system for a hydraulic powered penetrometer developed as an integral part of a soil bin facility is described with respect to its construction, accuracy, repeatability and versatility. The system can, for example, measure and display cone index versus depth graphically in real time or at the ...
A.P. Onwualu, K.C. Watts
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SOIL CONE INDEX ESTIMATION FOR DIFFERENT TILLAGE SYSTEMS

ASABE/CSBE North Central Intersectional Meeting, 2006
Soil cone index (CI) is a mechanical property which affects soil compaction and plant root development. In this study, data reported in the literature relating CI to tillage practices were compiled. Two different tillage practices were included and they were no-tillage and conventional tillage.
null Arun Kumar, null Ying Chen, null Shafiqur Rahman   +2 more
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Remote electronic acquisition of soil cone index measurement

Journal of Terramechanics, 1981
Abstract The cone penetrometer is widely used in tillage and off-road mobility research as an indicator of soil strength and density characteristics. Light-weight, manually operated units are especially useful in recording cone index determinations at remote field locations.
L.G. Wells, C.O. Lewis, R.J. Distler
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