scholarly journals Implications of seasonal variations, host and vector migration on spatial spread of sleeping sickness: Insights from a mathematical model

2021 ◽  
Vol 24 ◽  
pp. 100570
Author(s):  
Mlyashimbi Helikumi ◽  
Paride O. Lolika ◽  
Steady Mushayabasa
Keyword(s):  
Mathematical Model ◽  
Seasonal Variations ◽  
Sleeping Sickness ◽  
Spatial Spread

scholarly journals Seasonal Variations of the Optimum Reliable Frequencies During Maximum and Minimum Periods of Solar Cycle 24

2020 ◽  
Vol 31 (4) ◽  
pp. 15
Author(s):  
Samar Abdalkaream Thabit ◽  
Loay E. George ◽  
Khalid A. Hadi
Keyword(s):  
Mathematical Model ◽  
Solar Activity ◽  
Solar Cycle ◽  
Seasonal Variations ◽  
Path Length ◽  
Polynomial Equation ◽  
Ionospheric Parameter ◽  
Solar Cycle 24 ◽  
Path Lengths ◽  
Cycle 24

In this research, the seasonal Optimal Reliable Frequency (ORF) variations between different transmitter/receiver stations have been determined. Mosul, Baghdad, and Basra have been chosen as tested transmitting stations that located in the northern, center, and southern of Iraqi zone. In this research, the minimum and maximum years (2009 and 2014) of solar cycle 24 have been chosen to examine the effect of solar activity on the determined seasonal ORF parameter. Mathematical model has been proposed which leads to generate the Optimal Reliable Frequency that can maintain the seasonal connection links for different path lengths and bearings. The suggested ORF parameter represented by a different orders polynomial equation. The polynomial equation has been determined depending on different selected parameters (path length, bearing, time (day), months and BUF values). The suggested seasonal ORF parameter was examined for the three stations of the adopted years. The value of the seasonal ORF ionospheric parameter increased with the increase of path length and varies with the bearing between the transmitting and receiving stations also, the seasonal ORF values were higher at maximum solar cycle (2014) than the minimum solar cycle (2009).

scholarly journals A diffusive SEIR model for community transmission of Covid-19 epidemics: application to Brazil

2021 ◽  
Author(s):  
William E. Fitzgibbon ◽  
Jeffrey J. Morgan ◽  
Glenn F. Webb ◽  
Yixiang Wu
Keyword(s):  
Mathematical Model ◽  
Seir Model ◽  
Spatial Spread ◽  
Geographical Regions ◽  
Community Transmission

A mathematical model incorporating  diffusion is developed to describe the spatial spread of COVID-19 epidemics in geographical regions. The dynamics of the spatial spread are based on community transmission of the virus. The model is applied to the outbreak of the COVID-19 epidemic in Brazil.

scholarly journals Simulation and Evaluation of Seasonal Variations of Water Quality in Taleghan River Using a Mathematical Model

2019 ◽  
Vol 22 (4) ◽  
pp. 399-410
Author(s):  
P. Hadipour Nicktarash ◽  
H. Ghodousi ◽  
K. Ebrahimi ◽  
◽  
◽  
...  
Keyword(s):  
Mathematical Model ◽  
Water Quality ◽  
Seasonal Variations ◽  
Simulation And Evaluation

Diurnal and Seasonal Variations in the Coefficient of Refraction

1967 ◽  
Vol 21 (2) ◽  
pp. 142-151 ◽  
Author(s):  
P. V. Angus-Leppan
Keyword(s):  
Mathematical Model ◽  
Temperature Gradient ◽  
Seasonal Variations ◽  
Lower Atmosphere ◽  
Similar Model

As the accuracy of surveying observations continues to increase, the effects of the atmosphere are assuming greater importance. A mathematical model has been derived to represent the variations of the temperature gradient in the lower atmosphere. This can be used to indicate values of the coefficient of refraction under various conditions and the likely errors in electronically-measured distances. Further investigation will aim at a general form of the model and a similar model for humidity.

Seasonal variations in AADSAS applicants

1985 ◽  
Vol 49 (6) ◽  
pp. 445-447
Author(s):  
E Solomon ◽  
D Stoll
Keyword(s):  
Seasonal Variations

Mathematical model of hit phenomena and its application to movie advertisement

2008 ◽  
Author(s):  
Ishii Akira ◽  
Yoshida Narihiko ◽  
Hayashi Takafumi ◽  
Umemura Sanae ◽  
Nakagawa Takeshi
Keyword(s):  
Mathematical Model
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