Time-space model of summer ozone distribution around Ravenna

1993 ◽  
Vol 98 (D6) ◽  
pp. 10615 ◽  
Author(s):  
F. Fortezza ◽  
V. Strocchi ◽  
P. Bonasoni ◽  
T. Georgiadis ◽  
G. Giovanelli
Keyword(s):  
Space Model ◽  
Ozone Distribution ◽  
Time Space

Lebesgue-Time–Space-Model-Based Diagnosis and Prognosis for Multiple Mode Systems

2021 ◽  
Vol 68 (2) ◽  
pp. 1591-1603
Author(s):  
Dongzhen Lyu ◽  
Guangxing Niu ◽  
Bin Zhang ◽  
Gang Chen ◽  
Tao Yang
Keyword(s):  
Space Model ◽  
Model Based ◽  
Diagnosis And Prognosis ◽  
Multiple Mode ◽  
Time Space

Asynchronous time–space model for evolutionary market

Biosystems ◽  
2020 ◽  
Vol 198 ◽  
pp. 104272
Author(s):  
Kazuto Sasai
Keyword(s):  
Space Model ◽  
Time Space

Simulation of Free Chlorine Decay and Adaptive Chlorine Dosing by Discrete Time-Space Model for Drinking Water Distribution System

2007 ◽  
Vol 2 (2) ◽  
Author(s):  
Abrar Muslim ◽  
Qin Li ◽  
Moses O. Tadé
Keyword(s):  
Drinking Water ◽  
Distribution System ◽  
Water Distribution ◽  
Water Distribution System ◽  
Free Chlorine ◽  
Drinking Water Distribution System ◽  
Space Model ◽  
Time Space ◽  
Drinking Water Distribution ◽  
Over Time

An ideal drinking water distribution system (DWDS) must supply safe drinking water with free chlorine residual (FCR) in the form of HOCl and OCl- at a required concentration level. The FCR as a disinfectant decreases over time due to chemical reactions in the bulk phase and at the pipe wall in the DWDS. In order to supply drinking water with the FCR concentration within the safety range of 0.2-0.6 mg/l at the points of water consumption, it is important to develop a dynamic model of the FCR using a discrete time-space model (DTSM) that accounts for free chlorine transport in the axial direction by convection, diffusion and the decay kinetic. A DTSM has been developed using Finite Difference Method (FDM) to predict the FCR in single pipes in the DWDS. The DTSM has been computed using Matlab 7.0.1 and tested with step inputs and rectangular pulse inputs to estimate the FCR at any point in the pipes over time. Data found in the literature have been used to validate the DTSM. The modelling and simulation study shows that the water velocity significantly affects the FCR concentration distribution along the pipe. Due to the fluctuation of the drinking water demand, a model-based adaptive chlorine dosing scheme is proposed to control the proper injection of chlorine.

scholarly journals What is the Shape of Geographical Time-Space? A Three Dimensional Model made of Curves and Cones

2021 ◽  
Author(s):  
Alain L’Hostis ◽  
Farouk Abdou
Keyword(s):  
Transport System ◽  
Three Dimensional ◽  
Road Transport ◽  
Air Transport ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Relative Difficulty ◽  
Space Model ◽  
The Earth ◽  
Time Space

We propose a geographical time-space model extending time-space relief cartography introduced by Mathis and L’Hostis [,,,]. The novelty of the model resides in the use of cones to describe the terrestrial surface instead of graph faces, and in the use of curves instead of broken segments for edges. The approach lies a the intersection of two domains involving graphic representation: cartography, and three dimensional computer graphics. We implement the model on the Chinese space. The Chinese geographical time-space of the reference year 2006 is produced by the combination and the confrontation of the fast air transport system and of the 7.5 times slower road transport system. Slower, short range flights are represented as curved lines above the earth surface with longer length than the geodesic, in order to account for a slower speed. The very steep slope of cones expresses the relative difficulty of crossing terrestrial time-space, as well as the comparably extreme efficiency of long-range flights for moving between cities. Finally, the whole image proposes a coherent representation of the geographical time-space where fast city to city transport is combined with slow terrestrial systems that allow to reach any location.

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