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Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Structure-preserving machine learning moment closures for the radiative transfer equation
辐射传递方程 结构保持 机器学习 矩闭包
2023/4/24
In this talk, we present our work on structure-preserving machine learning (ML) moment closure models for the radiative transfer equation. Most of the existing ML closure models are not able to guaran...
A MODEL TO SIMULATE THE RADIATIVE TRANSFER OF FLUORESCENCE IN A LEAF
Leaf optical properties Chlorophyll fluorescence Radiative transfer Monte-Carlo method Photon packet Ray tracing
2018/5/16
Light is reflected, transmitted and absorbed by green leaves. Chlorophyll fluorescence (ChlF) is the signal emitted by chlorophyll molecules in the leaf after the absorption of light. ChlF can be used...
GEOMETRICAL AND STRUCTURAL PARAMETERIZATION OF FOREST CANOPY RADIATIVE TRANSFER BY LIDAR MEASUREMENTS
Remote Sensing Forestry LIDAR Vegetation Modelling Structure
2015/12/30
A forest canopy is a complex system with a highly structural multi-scale architecture. Physical based radiative transfer (RT) modelling has been shown to be an effective tool for retrieval of vegetati...
MAPPING OF FOLIAR CONTENT USING RADIATIVE TRANSFER MODELING AND VIS-NIR HYPERSPECTRAL CLOSE-RANGE REMOTE-SENSING
Close-range remote sensing Hyperspectral Leaf optical properties Radiative transfer model Vegetation
2015/9/21
Most methods for retrieving foliar content from hyperspectral data are well adapted either to remote-sensing scale, for which each spectral measurement has a spatial resolution ranging from a few doze...
INFERENCE OF IMPURITY RADIATIVE FORCING IN SNOW FROM MULTISPECTRAL TO HYPERSPECTRAL IMAGERS
soil moisture agriculture
2015/9/8
The inference of the radiative forcing of soot and dust in snow has taken on importance in recent years because of
the realization of the climate effects that they have (Hansen and Nazarenko, 2004). ...
RADIATIVE TRANSFER MODEL INVERSION BASED ON MULTI-TEMPORAL CHRIS/PROBA DATA FOR LAI ESTIMATION
Leaf area index Radiative transfer Dynamic canopy model
2015/9/8
Leaf area index (LAI) is a key variable for the understanding and modelling of several eco-physiological processes within a
vegetation canopy. The LAI could thus provide vital information for the man...
STOCHASTIC RADIATIVE TRANSFER MODEL FOR MIXTURE OF DISCONTINUOUS VEGETATION CANOPIES
Radiative Transfer Theory Three-domensional effects
2015/9/8
Modeling of the radiation regime of a mixture of vegetation species is a fundamental problem of the Earth’s land remote sensing and
climate applications. The major existing approaches, including the ...
Radiative transfer modelling and the retrieval of biophysical variables
Radiation transfer modelling multi-angular observations bio- geophysical variable extraction
2015/9/2
Natural surfaces, such as vegetation and soil, do not - as a rule - reflect incident solar radiation equally in all directions. This
reflectance anisotropy is formally described by a Bidirectional Re...
MODELING LIDAR WAVEFORMS USING A RADIATIVE TRANSFER MODEL
Lidar Radiative transfer modeling Canopy structure
2015/3/10
In the past, obtaining reliable measurements of key forest canopy metrics has been difficult, even after the development of remote sensing technology.Fortunately, next-generation lidar systems are pro...
Estimation of aerosol optical depth over Dehradun (India) using simple model for atmospheric radiative transfer in multiple scattering approximation
SMART multiple scattering approximation AWiFS aerosol optical depth
2014/12/15
Aerosol optical depth retrieval over land surface using remote sensing employs the use of radiative transfer simulations and/or simultaneous measurements of atmospheric parameters at the time of satel...
Standard solar cells heat up under sunlight. The resulting increased temperature of the solar cell has adverse consequences on both its efficiency and its reliability. We introduce a general approach ...
Passive radiative cooling below ambient air temperature under direct sunlight
Passive radiative cooling below ambient temperature direct sunlight
2015/8/6
Cooling is a significant end-use of energy globally and a major driver of peak electricity demand. Air conditioning, for example, accounts for nearly fifteen per cent of the primary energy used by bui...
Ultrabroadband Photonic Structures To Achieve High-Performance Daytime Radiative Cooling
Radiative cooling thermal radiation broadband solar mirror phonon-polariton selective emission
2015/8/7
If properly designed, terrestrial structures can passively cool themselves through radiative emission of heat to outer space. For the first time, we present a metal-dielectric photonic structure...
We introduce a general approach to radiatively lower the temperature of a structure, while preserving its color under sunlight. The cooling effect persists in the presence of considerable convective a...
Near-Field Radiative Cooling of Nanostructures
Near-fi eld thermal radiation resistive thermometry cooling
2015/8/7
We measure near-field radiative cooling of a thermally isolated nanostructure up to a few degrees and show that in principle this process can efficiently cool down localized hotspots by ten...