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Now showing items 1-20 of 1164

Soil Spectral Effects on 4-Space Vegetation Discrimination

Huete Alfredo; Post D.; Jackson R. (Elsevier, 1984)

The influence of soil background on vegetation discrimination in four-band reflectance space was examined. Dry and wet reflectance data were obtained for 20 soils covering a wide range in spectral properties with a hand-held ...
Optical endpoint sensing in an automatic whole blood clotting timer

Bertram Christopher; Milthorpe Bruce (Springer, 1984)

Most clotting time estimations are performed manually, although attempts have been made previously to automate them. The two major methods for automatically detecting the formation of the gel-like clot are mechanical ...
35 GHz Phase-locked Gunn Source Based On Current Hump Phase Detection

Braun Robin; Downing Bj (IEE-Inst Elec Eng, 1986)

The letter describes the implementation of a phase-locking scheme described earlier to a 35 GHz Gunn solid-state source (SSS). The CLTF is developed, a loop filter is chosen and the response to a step disturbance is measured. ...
Separation of Soil-Plant Spectral Mixtures by Factor Analysis

Huete Alfredo (Elsevier, 1986)

A factor-analytic inversion model is presented which enables a data set of spectral mixtures to be decomposed into the sum of unique reflecting components weighted by their corresponding amounts. Spectral mixtures are ...
Suitability of Spectral Indices for Evaluating Vegetation Characteristics on Arid Rangelands

Huete Alfredo; Jackson R. (Elsevier, 1987)

The spectral behavior of an arid, Lehmann lovegrass (Eragrostis lehmanniana), range canopy with varying quantities of live, green grass, senesced, yellow grass, weathered, gray litter, and different soil backgrounds was ...
Prescheduling graphic displays for optimal cancer therapies to reveal possible tumour regression or stabilisation

Thornton Barry; Langtry Timothy (Springer Science + Business Media, 1988)

The paper describes an adaptive control approach to the problem of the treatment of solid tumors. The evolution with time t of the state of a tumor is modelled by a two-compartment system, governed by two differential ...
Soil and Atmosphere Influences on the Spectra of Partial Canopies

Huete Alfredo; Jackson R. (Elsevier, 1988)

An atmospheric radiant transfer model was used to compare ground-measured radiances over partially vegetated canopies with their simulated responses at the top of a clear (100 km meteorological range) and a turbid (10 km) ...
A Soil-Adjusted Vegetation Index

Huete Alfredo (Elsevier, 1988)

A transformation technique is presented to minimize soil brightness influences from spectral vegetation indices involving red and near-infrared (NIR) wavelengths. Graphically, the transformation involves a shifting of the ...
Microcomputer-based system for tensile testing of biological materials

Milthorpe Bruce; Roger G; Schindhelm K (Springer, 1988)

The tensile testing of biological materials poses specific problems. Biological tissue may slip in the grips of the tensometer during tensile testing, and this needs to be taken into account in the calculation of strain. ...
A Comparison Of Fatigue Crack-growth Of Three Alloy-steels At Elevated-temperature

Cortie Michael; Garrett Gg (Elsevier Science Bv, 1989)

Fatigue cracks were grown in alloy steels by the use of a triangular loading waveform with a frequency of 1 Hz and an R-ratio of 0.1, and the crack growth rates were determined. The steel alloys Fe-1%Cr-0.5%Mo and ...
Assessment of Vegetation and Soil Water Regimes in Partial Canopies with Optical Remotely Sensed Data

Huete Alfredo; Warrick A (Elsevier, 1990)

The optical properties of a partially vegetated cotton field with spatially and temporally dynamic soil water conditions were analyzed with coincident aircraft and satellite data. The study was conducted at the Maricopa ...
Assessment of Biophysical Soil Properties Through Spectral Decomposition Techniques

Huete Alfredo; Escadafal R (Elsevier, 1991)

A mixture model was utilized to extract soil biophysical properties from fine resolution soil spectra (400¿900 nm) measured outdoors with a portable spectroradiometer. The objective of this study was to fully characterize ...
A Fractal Concept used in Time of Concentration Estimates

Aron G; Ball James; Smith T (American Society of Civil Engineers, 1991)

In present hydrologic practice, it is generally recognized that the shallow overland sheet flow through the upper portions of a watershed is very slow, and that runoff gradually accelerates as it concentrates into gullies ...
Treated xenografts as gliding tendon prostheses in an ovine model

Milthorpe Bruce; Schindhelm K; Howlett C; Hall P; Roger G (Elsevier Inc, 1991)

A model for testing the properties of gliding tendon grafts has been developed that allows anastomoses to be evaluated separately from the mid-portion of the graft. In addition, two different graft materials may be implanted ...
Normalization of Multidirectional Red and NIR Reflectances with the SAVI

Huete Alfredo; Hua G.; Qi J.; Chehbouni A; Van Leeuwen J (Elsevier, 1992)

Directional reflectance measurements were made over a semidesert gramma (Bouteloua spp.) grassland at various times of the growing season. Azimuthal strings of view angle measurements from + 40° to - 40° were made for ...
Osteoderms of estuarine crocodiles record their enhanced Pb exposure in Kakadu National Park

Twining John; Markich Scott; Prince Kathryn; Jeffree Ross (American Chemical Society, 1993)

Pb exposure in wild crocodiles, as recorded in their dermal bones (osteoderms). Riverine habitats of the estuarine crocodile, Crocodylus porosus, in Kakadu National Park, northern Australia, have been exposed to anthropogenic ...
Two-dimensional Interpolation Of Real Sequences Using The Dct

Agbinya Johnson (IEE-inst Elec Eng, 1993)

The conventional discrete cosine transform (DCT) is used to perform two-dimensional (2-D) interpolation of real sequences. It is shown that with a suitble modification of the DCT multiplying coefficients, alias-free image ...
2-dimensional Measurement Of Magnetic-field And Core Loss Using A Square Specimen Tester

Zhu Jianguo; Ramsden Victor (IEEE-inst Electrical Electronics Engineers Inc, 1993)

To improve the precision of two dimensional magnetic field measurement in a single sheet square specimen core loss measuring system, a novel sandwich arrangement of magnetic field sensing coils is proposed. The losses are ...
Interpretation of Vegetation Indices Derived from Multi-temporal SPOT Images

Qi J; Huete Alfredo; Moran M; Chehbouni A; Jackson R. (Elsevier, 1993)

A temporal sequence of 15 SPOT HRV images and low altitude aircraft reflectance data were obtained over soil and cotton fields at the Maricopa Agricultural Center, Arizona from April to October 1989. The SPOT data included ...
Terrestrial remote sensing science and algorithms planned for EOS/MODIS

Running S; Justice C; Salomonson V; Hall David; Barker J; Kaufmann Y; Strahler A; Huete Alfredo; Muller J; Vanderbilt V; Wan Z; Teillet P; Carneggie D (Taylor & Francis, 1994)

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