Evaluating WRF-Chem multi-scale model in simulating aerosol radiative properties over the tropics — A case study over India

MAPAN ◽  
2011 ◽  
Vol 26 (4) ◽  
pp. 269-284 ◽  
Author(s):  
C. Seethala ◽  
G. Pandithurai ◽  
Jerome D. Fast ◽  
Suraj D. Polade ◽  
M. S. Reddy ◽  
...  
Keyword(s):  
Radiative Properties ◽  
Scale Model ◽  
Multi Scale ◽  
The Tropics ◽  
Aerosol Radiative

scholarly journals Estimation and Optimal Control of the Multiscale Dynamics of Covid-19: A Case Study From Cameroon

2021 ◽  
Author(s):  
David Jaures FOTSA MBOGNE ◽  
Stéphane Yanick TCHOUMI ◽  
Yannick KOUAKEP TCHAPTCHIE ◽  
Vivient Corneille KAMLA ◽  
Jean Claude KAMGANG ◽  
...  
Keyword(s):  
Optimal Control ◽  
Human Population ◽  
Scale Model ◽  
Or Efficiency ◽  
Multi Scale ◽  
Human Contact ◽  
Multiscale Dynamics ◽  
Disease Free ◽  
Human Density

Abstract This work aims at a better understanding and the optimal control of the spread of the new severe acute respiratory corona virus 2 (SARS-CoV-2). We first propose a multi-scale model giving insights on the virus population dynamics, the transmission process and the infection mechanism. We consider 10 compartments in the human population in order to take into accounts the effects of different specific mitigation policies. The population of viruses is also partitioned into 10 compartments corresponding respectively to each of the first nine human population compartments and the free viruses available in the environment. We show the global stability of the disease free equilibrium if a given threshold T0 is less or equal to 1 and we provide how to compute the basic reproduction number R0. A convergence index T1 is also defined in order to estimate the speed at which the disease extincts and an upper bound to the time of extinction is given. The existence of the endemic equilibrium is conditional and its description is provided. We evaluate the sensitivity of R0, T0 and T1 to control parameters such as the maximal human density allowed per unit of surface, the rate of disinfection both for people and environment, the mobility probability, the wearing mask probability or efficiency, and the human to human contact rate which results from the previous one. According to a functional cost taking into consideration economic impacts of SARS-CoV-2, we determine and discuss optimal fighting strategies. The study is applied to available data from Cameroon.

scholarly journals Meta‐replication, sampling bias, and multi‐scale model selection: A case study on snow leopard ( Panthera uncia ) in western China

2020 ◽  
Vol 10 (14) ◽  
pp. 7686-7712
Author(s):  
Luciano Atzeni ◽  
Samuel A. Cushman ◽  
Defeng Bai ◽  
Jun Wang ◽  
Pengju Chen ◽  
...  
Keyword(s):  
Model Selection ◽  
Sampling Bias ◽  
Western China ◽  
Scale Model ◽  
Snow Leopard ◽  
Multi Scale ◽  
Panthera Uncia

A case study in multi-scale model reduction: The effect of cell density on catalytic converter performance

2014 ◽  
Vol 92 (9) ◽  
pp. 1607-1617 ◽  
Author(s):  
Anton Fadic ◽  
Teng-Wang Nien ◽  
Joseph Mmbaga ◽  
Robert E. Hayes ◽  
Martin Votsmeier
Keyword(s):  
Model Reduction ◽  
Cell Density ◽  
Catalytic Converter ◽  
Scale Model ◽  
Multi Scale

An in silico case study of idiopathic dilated cardiomyopathy via a multi-scale model of the cardiovascular system

2014 ◽  
Vol 53 ◽  
pp. 141-153 ◽  
Author(s):  
Benjamin Bhattacharya-Ghosh ◽  
Selim Bozkurt ◽  
Marcel C.M. Rutten ◽  
Frans N. van de Vosse ◽  
Vanessa Díaz-Zuccarini
Keyword(s):  
Dilated Cardiomyopathy ◽  
Cardiovascular System ◽  
In Silico ◽  
Idiopathic Dilated Cardiomyopathy ◽  
Scale Model ◽  
Multi Scale

Three-dimensional Reconstruction of Microscopic Image Based on Multi-ST Algorithm

2020 ◽  
Vol 64 (2) ◽  
pp. 20506-1-20506-7
Author(s):  
Min Zhu ◽  
Rongfu Zhang ◽  
Pei Ma ◽  
Xuedian Zhang ◽  
Qi Guo
Keyword(s):  
3D Reconstruction ◽  
Three Dimensional ◽  
Scale Model ◽  
Microscopic Image ◽  
Multi Scale ◽  
Gaussian Pyramid ◽  
Cost Aggregation ◽  
Dimensional Reconstruction ◽  
Image Pairs ◽  
Accurate Matching

Abstract Three-dimensional (3D) reconstruction is extensively used in microscopic applications. Reducing excessive error points and achieving accurate matching of weak texture regions have been the classical challenges for 3D microscopic vision. A Multi-ST algorithm was proposed to improve matching accuracy. The process is performed in two main stages: scaled microscopic images and regularized cost aggregation. First, microscopic image pairs with different scales were extracted according to the Gaussian pyramid criterion. Second, a novel cost aggregation approach based on the regularized multi-scale model was implemented into all scales to obtain the final cost. To evaluate the performances of the proposed Multi-ST algorithm and compare different algorithms, seven groups of images from the Middlebury dataset and four groups of experimental images obtained by a binocular microscopic system were analyzed. Disparity maps and reconstruction maps generated by the proposed approach contained more information and fewer outliers or artifacts. Furthermore, 3D reconstruction of the plug gauges using the Multi-ST algorithm showed that the error was less than 0.025 mm.

Effects of parametric uncertainty on multi-scale model predictions of shock response of a pressed energetic material

2019 ◽  
Vol 125 (23) ◽  
pp. 235104 ◽  
Author(s):  
Sangyup Lee ◽  
Oishik Sen ◽  
Nirmal Kumar Rai ◽  
Nicholas J. Gaul ◽  
K. K. Choi ◽  
...  
Keyword(s):  
Energetic Material ◽  
Parametric Uncertainty ◽  
Scale Model ◽  
Multi Scale ◽  
Model Predictions ◽  
Shock Response

scholarly journals Assessment of ecosystem services provided by livestock agroecosystems in the tropics: a case study of tropical island environment of Guadeloupe

2021 ◽  
Vol 53 (4) ◽  
Author(s):  
J.-L. Gourdine ◽  
A. Fourcot ◽  
C. Lefloch ◽  
M. Naves ◽  
G. Alexandre
Keyword(s):  
Ecosystem Services ◽  
Farming System ◽  
Livestock Farming ◽  
Tropical Island ◽  
Cultural Aspects ◽  
Livestock Farming System ◽  
Agroecological Zones ◽  
The Tropics ◽  
Cluster 2

AbstractThe present study aims to assess (1) the ecosystem services (ES) provided by LFS and (2) the differential ES between local (Creole) and exotic breeds from pig, cattle and goat. The ES are defined as the benefits that humans derive from LFS. They were summarized in 12 ES indicators that cover services related to provisioning, ecological and socio-cultural aspects and territorial vitality. A total of 106 LFS units that covers the five agroecological zones of Guadeloupe were analysed. Functional typologies of LFS per species were created from surveys. The effect of breed on the ES indicators was tested. Results showed that the 40 pig LFS units were separated into 3 clusters that were differentiated in ES according to provisioning ES (cluster 1), cultural use and sale to the neighborhood (cluster 2) and pork self-consumption (cluster 3). The typology of the 57 farms with cattle distinguished 4 clusters with differences in ES provided in self-consumption (cluster1), ecological ES (cluster 2), socio-cultural ES for racing or draught oxen (cluster 3) and ES associated with territory vitality (cluster 4). The 66 goat LFS units were classified into 3 clusters different in ES concerning self-consumption (cluster 1), cultural aspects (cluster 2) and provisioning ES (cluster 3). Our study highlights that ES indicators are not breed dependent (P > 0.10) but rather livestock farming system dependent. The ES rely more on the rearing management than on the breed type, and up to now, there are no specifications in Guadeloupe to differentiate management between breeds.

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