Results 31 to 40 of about 300,695 (305)

Fast Kernel Density Estimation with Density Matrices and Random Fourier Features Software

open access: yes, 2022
Kernel density estimation (KDE) is one of the most widely used nonparametric density estimation methods. The fact that it is a memory-based method, i.e., it uses the entire training data set for prediction, makes it unsuitable for most current big data ...
Osorio, Juan F.   +2 more
core   +1 more source

Wood Properties of 38-year-old Cariniana legalis (Mart.) Kuntze Based on Planting Spacing

open access: yesColombia Forestal, 2022
This study aimed to analyze the properties of 38-year-old Cariniana legalis wood from trees planted with three spacings between trees: 3 × 2.5, 3 × 2, and 3 × 1.5 m. Five trees were collected from each tree spacing.
Israel Luiz De Lima   +5 more
doaj   +1 more source

Crop Yields in European Agroforestry Systems: A Meta-Analysis

open access: yesFrontiers in Sustainable Food Systems, 2021
Agroforestry is the practice of integrating woody vegetation with crops and/or livestock production in order to strengthen ecological services on farmland and achieve a more multi-functional agricultural system.
Vladimir Ivezić   +2 more
doaj   +1 more source

NITROGEN CAN LIMIT OVERSTORY TREE GROWTH FOLLOWING EXTREME STAND DENSITY INCREASE IN A PONDEROSA PINE FOREST

open access: yes, 2019
Extreme stand density increases have occurred in ponderosa pine forests throughout the western U.S. since the early 20th Century, with adverse implications for growth, physiological functioning, and mortality risk. Identifying primary stressors on large,
Marshall, L.A.   +3 more
core   +1 more source

Anderson model on a Cayley tree: the density of states [PDF]

open access: yesJournal of Physics A: Mathematical and General, 1993
The authors describe a method of calculating the electronic density of states on an arbitrary tree. They use it for the problem of Anderson localization on a regular tree with random site energies and obtain the first term of a weak disorder expansion of the density of states.
Derrida, Bernard, Rodgers, G. J.
openaire   +2 more sources

Settlement‐era forest structure and composition in the Klamath Mountains: reconstructing a historical baseline

open access: yesEcosphere, 2020
Historical baselines of forest conditions provide reference states to assess how forests have changed through time. In California, the Public Land Survey System (PLSS) provides tree inventory data between 1872 and 1884 at 93.2‐km2 (36 mi2) resolution ...
Clarke A. Knight   +4 more
doaj   +1 more source

Density and Fractal Property of the Class of Oriented Trees

open access: yesCoRR, 2019
We show the density theorem for the class of finite oriented trees ordered by the homomorphism order. We also show that every interval of oriented trees, in addition to be dense, is in fact universal. We end by considering the fractal property in the class of all finite digraphs.
Jan Hubicka   +2 more
openaire   +3 more sources

Cool Communities—Urban Density, Trees, and Health [PDF]

open access: yesInternational Journal of Environmental Research and Public Health, 2018
A move towards more compact and climate-resilient cities is being encouraged around the world. As part of these plans, there is a need to manage the potential conflict between increasing urban densities and the extent of tree canopy in cities. Reductions in tree canopy are a major contributor to the urban heat island (UHI) effect, which will act to ...
Helen Brown   +5 more
openaire   +4 more sources

Extraction of Mangrove Biophysical Parameters Using Airborne LiDAR

open access: yesRemote Sensing, 2013
Tree parameter determinations using airborne Light Detection and Ranging (LiDAR) have been conducted in many forest types, including coniferous, boreal, and deciduous.
Poonsak Miphokasap   +4 more
doaj   +1 more source

618 Tree Form and Tree Density Affect Peach Tree Cropping and Profitability [PDF]

open access: yesHortScience, 1999
`Norman' peach trees were trained to the central-leader or open-vase form and were planted at high (740 trees/ha) or low (370 trees/ha) density. A third density treatment was a high/low density, where alternate trees in high-density plots were removed after 6 years to produce a low-density treatment.
Richard P. Marini, Donald S. Sowers
openaire   +2 more sources

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