Results 221 to 230 of about 56,714 (261)

Moisture and Density Effect on Cone Index

Transactions of the ASAE, 1982
ABSTRACT CONE index, a measure of the penetration resistance of a soil, is affected by many factors including soil density, moisture content, and soil type. The effect of each of these three variables on cone index was in-vestigated and discussed. Based on experimental data, an equation for cone index as a function of moisture con-tent and density was ...
null P. D. Ayers, null J. V. Perumpral
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A Microcomputer System for Cone Index Measurement

Transactions of the ASAE, 1983
ABSTRACT HIGH soil strength has been shown by many researchers to be a significant soil physical property that reduces crop yields. A fast yet accurate method of determining whether this problem exists in a particular soil is needed for tillage for research and for research involving yield trials.
null Glen P. Riethmuller, null David G. Batchelder, null Peter D. Bloome   +2 more
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Cone Index Prediction of Compacted Soils

Transactions of the ASAE, 1988
ABSTRACT THE cone index prediction equation for three soil textures varying in organic matter contents that were subjected to three levels of compaction energy was obtained. The equation is of the form: (CI/Pc) = A (Ts/Qp)^. The functional form of A and n was determined for sandy loam, clay loam and clay for varying moisture contents.
null John O. Ohu, null G. S. V. Raghavan, null E. McKyes   +2 more
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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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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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SIMULTANEOUS SOIL MOISTURE AND CONE INDEX MEASUREMENT

Transactions of the ASAE, 2004
Soil compaction can restrict root growth and water infiltration, resulting in yield reduction. Maps of yield monitor data aid in visualization of variations in yield, without identifying underlying factors for these variations. Soil penetration resistance can help identify areas where soil physical characteristics are negatively impacting yield ...
null J. W. Hummel, null I. S. Ahmad, null S. C. Newman, null K. A. Sudduth, null S. T. Drummond   +4 more
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Development of a Digital Cone Index Measuring Device

Journal of Biosystems Engineering, 2010
This study was performed to design and to construct a digital soil cone index(CI) measuring device replacing conventional analog type devices. The device developed in the study consisted of a load cell, a rotary encoder and a motor with a decelerator as its main parts.
Kyou-Seung Lee, Dong-Hoon Lee, Yong-Jin Cho, Sun-Ok Chung, Won-Yeop Park, Kwang-Mo Noh, Young-Chang Chang   +6 more
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Determination of soil density by cone index data

Journal of Terramechanics, 2018
Abstract In this paper a novel soil-density determination method is presented. The classic method (sampling, drying, mass measuring, etc.) can give proper results for the given problem but the standard methodology requires a lot of practical effort. While the soil is generally inhomogeneous, the measured density values of the soil sample applies only
György Pillinger, Attila Géczy, Zoltán Hudoba, Péter Kiss   +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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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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