Results 21 to 30 of about 228,699 (300)

Spin susceptibility and gap structure of the fractional-statistics gas [PDF]

open access: yesPhysical Review B, 1994
35 pages, written in REVTeX, 16 figures available upon request from jared@large.stanford ...
Levy, J. L., Laughlin, R. B.
openaire   +3 more sources

Retrieving Forest Canopy Elements Clumping Index Using ICESat GLAS Lidar Data

open access: yesRemote Sensing, 2021
Clumping index (CI) is a canopy structural variable important for modeling the terrestrial biosphere, but its retrieval from remote sensing data remains one of the least reliable.
Lei Cui   +11 more
doaj   +1 more source

Fundamental gaps of the fractional Schrödinger operator

open access: yesCommunications in Mathematical Sciences, 2019
We study asymptotically and numerically the fundamental gap -- the difference between the first two smallest (and distinct) eigenvalues -- of the fractional Schrödinger operator (FSO) and formulate a gap conjecture on the fundamental gap of the FSO.
Bao, Weizhu   +3 more
openaire   +2 more sources

Retrieving Leaf Area Index (LAI) Using Remote Sensing: Theories, Methods and Sensors

open access: yesSensors, 2009
The ability to accurately and rapidly acquire leaf area index (LAI) is an indispensable component of process-based ecological research facilitating the understanding of gas-vegetation exchange phenomenon at an array of spatial scales from the leaf to the
Guang Zheng, L. Monika Moskal
doaj   +1 more source

Estimating Effective Leaf Area Index of Winter Wheat Using Simulated Observation on Unmanned Aerial Vehicle-Based Point Cloud Data

open access: yesIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2020
Within-field variation of leaf area index (LAI) plays an essential role in field crop monitoring and yield forecasting. Although unmanned aerial vehicle (UAV)-based optical remote sensing method can overcome the spatial and temporal resolution ...
Yang Song, Jinfei Wang, Jiali Shang
doaj   +1 more source

Direct Estimation of Forest Leaf Area Index based on Spectrally Corrected Airborne LiDAR Pulse Penetration Ratio

open access: yesRemote Sensing, 2020
The leaf area index (LAI) is a crucial structural parameter of forest canopies. Light Detection and Ranging (LiDAR) provides an alternative to passive optical sensors in the estimation of LAI from remotely sensed data. However, LiDAR-based LAI estimation
Yonghua Qu   +6 more
doaj   +1 more source

Scaling relations for gaps in fractional quantum Hall states [PDF]

open access: yesPhysical Review B, 1998
The microscopic approach of Murthy and Shankar, which has recently been used to calculate the transport gaps of quantum Hall states with fractions p/(2ps+1), also implies scaling relations between gaps within a single sequence (fixed s) as well as between gaps of corresponding states in different sequences.
Murthy, Ganpathy   +3 more
openaire   +2 more sources

Olive Crown Porosity Measurement Based on Radiation Transmittance: An Assessment of Pruning Effect

open access: yesSensors, 2016
Crown porosity influences radiation interception, air movement through the fruit orchard, spray penetration, and harvesting operation in fruit crops. The aim of the present study was to develop an accurate and reliable methodology based on transmitted ...
Francisco J. Castillo-Ruiz   +4 more
doaj   +1 more source

Extracting Leaf Area Index by Sunlit Foliage Component from Downward-Looking Digital Photography under Clear-Sky Conditions

open access: yesRemote Sensing, 2015
The development of near-surface remote sensing requires the accurate extraction of leaf area index (LAI) from networked digital cameras under all illumination conditions.
Yelu Zeng   +8 more
doaj   +1 more source

Forest Canopy Height and Gaps from Multiangular BRDF, Assessed with Airborne LiDAR Data (Short Title: Vegetation Structure from LiDAR and Multiangular Data)

open access: yesRemote Sensing, 2019
Both vegetation multi-angular and LiDAR (light detection and ranging) remote sensing data are indirectly and directly linked with 3D vegetation structure parameters, such as the tree height and vegetation gap fraction, which are critical elements in ...
Qiang Wang, Wenge Ni-Meister
doaj   +1 more source

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