Results 81 to 90 of about 1,037,044 (293)

On the Use of Semi-empirical Flame Models for Spreading Chaparral Crown Fire

open access: yesFrontiers in Mechanical Engineering, 2019
Flame geometry plays a key role in shaping fire behavior as it can influence flame spread, radiative heat transfer and fire intensity. For wildland fire, thorough characterizations of flame geometry can help advance the derivation of comprehensive models
Jeanette Cobian-Iñiguez   +3 more
doaj   +1 more source

A Modified Semi-Empirical Radar Scattering Model for Weathered Rock Surfaces

open access: yesCanadian Journal of Remote Sensing, 2020
This study presents a modified semi-empirical radar scattering model for weathered rough rock surfaces. Weathered rocks generally have dry surfaces except for a few hours after heavy rain due to their rapid drainage compared to bare soils.
Byung-Hun Choe   +3 more
doaj   +1 more source

Mixed‐Metal Promotion in a Manganese‐Molybdenum Oxynitride as Catalyst to Integrate C─C and C─N Coupling Reactions for the Direct Synthesis of Acetonitrile from Syngas and Ammonia

open access: yesAdvanced Materials, EarlyView.
Transition metal oxy/carbo‐nitrides show great promise as catalysts for sustainable processes. A Mn‐Mo mixed‐metal oxynitride attains remarkable performance for the direct synthesis of acetonitrile, an important commodity chemical, via sequential C─N and C─C coupling from syngas (C1) and ammonia (N1) feedstocks.
M. Elena Martínez‐Monje   +7 more
wiley   +1 more source

Estimation of Aboveground Biomass in Alpine Forests: A Semi-Empirical Approach Considering Canopy Transparency Derived from Airborne LiDAR Data

open access: yesSensors, 2010
In this study, a semi-empirical model that was originally developed for stem volume estimation is used for aboveground biomass (AGB) estimation of a spruce dominated alpine forest. The reference AGB of the available sample plots is calculated from forest
Martin Rutzinger   +3 more
doaj   +1 more source

Sentinel-MSI and Landsat-OLI Data Quality Characterization for High Temporal Frequency Monitoring of Soil Salinity Dynamic in an Arid Landscape

open access: yesIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2020
Although the Sentinel-MSI and Landsat-OLI are designed to be similar, they have different spectral, spatial and radiometric resolutions. In addition, relative spectral response profiles characterizing the filters responsivities of the both instruments ...
Abdou Bannari   +3 more
doaj   +1 more source

Continued analysis of OSO-8 and Kitt Peak data on solar faculae [PDF]

open access: yes
An improved semi-empirical model of phosphoric faculae is presented in tabular form.
Chapman, G. A.
core   +1 more source

Opportunities of Semiconducting Oxide Nanostructures as Advanced Luminescent Materials in Photonics

open access: yesAdvanced Materials, EarlyView.
The review discusses the challenges of wide and ultrawide bandgap semiconducting oxides as a suitable material platform for photonics. They offer great versatility in terms of tuning microstructure, native defects, doping, anisotropy, and micro‐ and nano‐structuring. The review focuses on their light emission, light‐confinement in optical cavities, and
Ana Cremades   +7 more
wiley   +1 more source

Superionic Amorphous Li2ZrCl6 and Li2HfCl6

open access: yesAdvanced Materials, EarlyView.
Amorphous Li2HfCl6 and L2ZrCl6 are shown to be promising solid‐state electrolytes with predicted ionic conductivities >20 mS·cm−1. Molecular dynamics simulations with machine‐learning force fields reveal that anion vibrations and flexible MCl6 octahedra soften the Li coordination cage and enhance mobility. Correlation between Li‐ion diffusivity and the
Shukai Yao, De‐en Jiang
wiley   +1 more source

http://ntv.ifmo.ru/file/article/9657.pdf [PDF]

open access: yesНаучно-технический вестник информационных технологий, механики и оптики, 2016
Simple numerical models of low-pressure air gas discharge have been developed based on modern concepts of nonlocal plasma methods of the computational simulation of multi-component discharge environments.
M. V. Tchernycheva   +3 more
doaj  

Kaon fragmentation function from NJL-jet model

open access: yes, 2010
The NJL-jet model provides a sound framework for calculating the fragmentation func- tions in an effective chiral quark theory, where the momentum and isospin sum rules are satisfied without the introduction of ad hoc parameters [1].
Bentz, Wolfgang   +2 more
core   +1 more source

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