RADIO FREQUENCY VACUUM DRYING OF WOOD. I. MATHEMATICAL MODEL

2001 ◽  
Vol 19 (1) ◽  
pp. 65-84 ◽  
Author(s):  
Anastasios Koumoutsakos ◽  
Stavros Avramidis ◽  
Savvas G. Hatzikiriakos
Holzforschung ◽  
2003 ◽  
Vol 57 (1) ◽  
pp. 88-94 ◽  
Author(s):  
D. Elustondo ◽  
A. Koumoutsakos ◽  
S. Avramidis

Summary A numerical method is proposed to predict the stochastic dispersion of data that unavoidably occurs in a real drying process. The method is based on the use of discrete frequency distribution curves to predict a random variation on some parameters of the process and is applied to the case of radio frequency vacuum (RFV) drying of wood. Experimental data of RFV drying of western hemlock timbers were used to obtain the numeric values of the stochastic parameters and their standard deviation. A mathematical model was designed to simulate the final moisture content dispersion on hypothetical examples. Results were quantified using three indices: average, range and standard deviation.


2017 ◽  
Vol 108 ◽  
pp. 10001 ◽  
Author(s):  
Zairul Amin Rabidin ◽  
Gan Kee Seng ◽  
Mohd Jamil Abdul Wahab

2021 ◽  
Vol 5 (2) ◽  
pp. 148-151
Author(s):  
Адалат Бахтияр Пашаев ◽  
Ельхан Наріман оглу Сабзієв ◽  
Аріф Гасан огли Гасанов

The problem of radio frequency distribution is considered in the article, taking into account the regulations and geographical location of the operating units. The problem of assigning radio frequencies from among those assigned for corporate use is studied. Using conformal mapping, it was substantiated that any territory can be divided into zones, each of which will have a border with only three other zones. In this case, in each zone, you can assign frequencies in the amount of one quarter of the total number of available frequencies that do not overlap with frequencies assigned to adjacent zones. A mathematical model of the problem of radio frequency redistribution has been built, taking into account the regulations and the geographical location of the units. The implementation of algorithm allows taking into account the history of frequency distribution by zones, which allows you to completely update the used radio frequencies for a new period of operation. A software module has been compiled that generates frequencies at random from those available for assigning corporate use for each zone. The software module allows fast and frequent reallocation of frequencies by zones, thereby ensuring the safety, reliability and stability of communication between organizational units.


2015 ◽  
Vol 10 (3) ◽  
pp. 89-96
Author(s):  
Gulnara Izmaylova ◽  
Liana Kovaleva ◽  
Nur Nasyrov

We investigate the possibility of increasing the efficiency of extraction of high-viscosity oil combined effect of radio-frequency (RF) electromagnetic (EM) and acoustic fields on the formation and miscible displacement oil solvent. A mathematical model of two-stage impact on the oil reservoir. At the 1st stage, the heating of the formation RF electromagnetic and acoustic field. At the 2nd stage the RF heating of the formation with simultaneous injection of low-viscosity solvent.


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