Mathematical Models to Describe Antioxidant Depletion in Polyethylene-Clay Nanocomposites under Thermal Aging

2021 ◽  
Author(s):  
Iftekhar Ahmad
Keyword(s):  
Mathematical Models ◽  
Thermal Aging ◽  
Clay Nanocomposites

Reaction model describing antioxidant depletion in polyethylene–clay nanocomposites under thermal aging

2014 ◽  
Vol 110 ◽  
pp. 318-335 ◽  
Author(s):  
Iftekhar Ahmad ◽  
Christopher Y. Li ◽  
Y. Grace Hsuan ◽  
Richard A. Cairncross
Keyword(s):  
Thermal Aging ◽  
Reaction Model ◽  
Clay Nanocomposites

Depletion mechanism of antioxidants in MDPE-clay nanocomposites under thermal aging

2012 ◽  
Vol 97 (2) ◽  
pp. 192-199 ◽  
Author(s):  
Wai-Kuen Wong ◽  
Shan Cheng ◽  
Christopher Y. Li ◽  
Iftekhar Ahmad ◽  
Richard Cairncross ◽  
...  
Keyword(s):  
Thermal Aging ◽  
Clay Nanocomposites

Handbook of Mathematical Models for Languages and Computation

2019 ◽  
Author(s):  
Alexander Meduna ◽  
Petr Horacek ◽  
Martin Tomko
Keyword(s):  
Mathematical Models

Dependence of Current Harmonics of Greenhouse Irradiators on Supply Voltage

2020 ◽  
pp. 85-88 ◽  
Author(s):  
Nadezhda P. Kondratieva
Keyword(s):  
Mathematical Models ◽  
Supply Voltage ◽  
Harmonic Distortion ◽  
Feasibility Studies ◽  
Power Losses ◽  
Voltage Level ◽  
Supply Networks ◽  
Current Harmonics ◽  
Cable Lines ◽  
Harmonic Composition

The article describes the results of the study concerning the effect of the voltage level on current harmonic composition in greenhouses irradiators. It is found that its change affects the level of current harmonics of all types of the studied greenhouse irradiators. With decrease of nominal supply voltage by 10 %, the total harmonic distortion THDi decreases by 9 % for emitters equipped with high pressure sodium lamps (HPSL), by 10 % for emitters with electrode-less lamps and by 3 % for LED based emitters. With increase of nominal supply voltage by 10 %, THDi increases by 23 % for lighting devices equipped with HPSL, by 10 % for irradiators with electrode-less lamps and by 3 % for LED based emitters. Therefore, changes of supply voltage cause the least effect on the level of current harmonics of LED based emitters and then the emitters with electrode-less lamps. Change of the level of supply voltage causes the greatest effect on the level of current harmonics of HPSL based irradiators. Mathematical models of dependence of THDi on the level of supply voltage for greenhouse emitters equipped with LED, electrode-less lamps and HPSL lamps were formulated. These mathematical models may be used for calculations of total current when selecting transformers and supply cable lines for greenhouse lighting devices, for design of new or reconstruction of existing irradiation systems of greenhouse facilities, and for calculation of power losses in power supply networks of greenhouse facilities during feasibility studies for energy saving and energy efficiency increasing projects.

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