A semi-empirical approach to estimate vertical transport by nonprecipitating convective clouds on a regional scale

1990 ◽  
Vol 24 (8) ◽  
pp. 2153-2168 ◽  
Author(s):  
Fred M. Vukovich ◽  
Jason K.S. Ching
Keyword(s):  
Regional Scale ◽  
Vertical Transport ◽  
Empirical Approach ◽  
Convective Clouds ◽  
Semi Empirical

scholarly journals How Accurate Is an Unmanned Aerial Vehicle Data-Based Model Applied on Satellite Imagery for Chlorophyll-a Estimation in Freshwater Bodies?

2021 ◽  
Vol 13 (6) ◽  
pp. 1134
Author(s):  
Anas El-Alem ◽  
Karem Chokmani ◽  
Aarthi Venkatesan ◽  
Lhissou Rachid ◽  
Hachem Agili ◽  
...  
Keyword(s):  
Chlorophyll A ◽  
Unmanned Aerial Vehicle ◽  
Optical Sensors ◽  
Regional Scale ◽  
Turbid Waters ◽  
Vehicle Data ◽  
Freshwater Bodies ◽  
Aerial Vehicle ◽  
Leave One Out ◽  
Semi Empirical

Optical sensors are increasingly sought to estimate the amount of chlorophyll a (chl_a) in freshwater bodies. Most, whether empirical or semi-empirical, are data-oriented. Two main limitations are often encountered in the development of such models. The availability of data needed for model calibration, validation, and testing and the locality of the model developed—the majority need a re-parameterization from lake to lake. An Unmanned aerial vehicle (UAV) data-based model for chl_a estimation is developed in this work and tested on Sentinel-2 imagery without any re-parametrization. The Ensemble-based system (EBS) algorithm was used to train the model. The leave-one-out cross validation technique was applied to evaluate the EBS, at a local scale, where results were satisfactory (R2 = Nash = 0.94 and RMSE = 5.6 µg chl_a L−1). A blind database (collected over 89 lakes) was used to challenge the EBS’ Sentine-2-derived chl_a estimates at a regional scale. Results were relatively less good, yet satisfactory (R2 = 0.85, RMSE= 2.4 µg chl_a L−1, and Nash = 0.79). However, the EBS has shown some failure to correctly retrieve chl_a concentration in highly turbid waterbodies. This particularity nonetheless does not affect EBS performance, since turbid waters can easily be pre-recognized and masked before the chl_a modeling.

A semi-empirical approach to estimate the parameters determining the LR-115 detector response in radon measurements

2018 ◽  
Vol 118 ◽  
pp. 36-42 ◽  
Author(s):  
Jhonny Rojas ◽  
Daniel Palacios ◽  
Patrizia Pereyra ◽  
Bertin Pérez ◽  
Laszlo Sajo Bohus ◽  
...  
Keyword(s):  
Empirical Approach ◽  
Detector Response ◽  
Semi Empirical ◽  
Radon Measurements

scholarly journals Carbon precursor analysis for catalytic growth of carbon nanotube in flame synthesis based on semi-empirical approach

2020 ◽  
Vol 30 (5) ◽  
pp. 569-579
Author(s):  
Muhammad Thalhah Zainal ◽  
Mohd Fairus Mohd Yasin ◽  
Wan Fahmin Faiz Wan Ali ◽  
Khairul Fikri Tamrin ◽  
Mohd Hanafi Ani
Keyword(s):  
Carbon Nanotube ◽  
Empirical Approach ◽  
Flame Synthesis ◽  
Carbon Precursor ◽  
Catalytic Growth ◽  
Semi Empirical
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