Results 11 to 20 of about 2,567,650 (293)

Gap and congruency effect in fraction comparison

open access: yes, 2018
Natural number bias in fraction comparison has been studied examining the role of congruency effect. However, the congruency effect has been observed in opposite directions, suggesting that an explanation may lie in the strategies used by students. One of the strategies that may be used by students is gap thinking. We have carried out a cross-sectional
González-Forte, Juan Manuel   +2 more
openaire   +2 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

GAPS BETWEEN FRACTIONAL PARTS, AND ADDITIVE COMBINATORICS [PDF]

open access: yesThe Quarterly Journal of Mathematics, 2015
We give bounds on the number of distinct differences $N_a-a$ as $a$ varies over all elements of a given finite set $A$, and $N_a$ is a nearest neighbour to $a$.
Balog, Antal   +2 more
openaire   +4 more sources

Direct Measurements of Fractional Quantum Hall Effect Gaps [PDF]

open access: yesPhysical Review Letters, 2007
We measure the chemical potential jump across the fractional gap in the low-temperature limit in the two-dimensional electron system of GaAs/AlGaAs single heterojunctions. In the fully spin-polarized regime, the gap for filling factor nu=1/3 increases LINEARLY with magnetic field and is coincident with that for nu=2/3, reflecting the electron-hole ...
Khrapai VS   +7 more
openaire   +4 more sources

ASSESSMENT OF LIGHT ENVIRONMENT FOR HERBACEOUS VEGETATION IN SEMI-NATURAL GRASSLAND USING TIME-SERIES UAV DATA [PDF]

open access: yesISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2023
Grasslands are important ecosystems containing unique biodiversity. It has been reported that some herbaceous species inhabiting grassland reduced its number and became extremely rare.
N. Miura, Y. Niwa, S. Yamada
doaj   +1 more source

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

Estimating Effective Leaf Area Index of Winter Wheat Based on UAV Point Cloud Data

open access: yesDrones, 2023
Leaf area index (LAI) is a widely used plant biophysical parameter required for modelling plant photosynthesis and crop yield estimation. UAV remote sensing plays an increasingly important role in providing the data source needed for LAI extraction. This
Jie Yang   +7 more
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

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

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