ABSTRACT
The basic correlation is defined which characterizes an influence of electromagnetic radiation on a system of individual particles of ellipsoidal geometry dispersed into some volume (chaotic arrangement) of another medium. The field intensity inside one isolated particle is determined depending on the parameters of the external (relative to the volume) electromagnetic field. Energy loss in an isolated particle is calculated. The shielding effect of a field in an isolated particle by other surrounding particles is taken into account. The relative dielectric permittivity and the relative loss tangent as a function of grain moisture content are measured. Drying and disinfestation of wheat grain by electromagnetic methods are observed.
Subject(s)
Desiccation/methods , Edible Grain/radiation effects , Electromagnetic Fields , Food Contamination/prevention & control , Insect Control/methods , Insecta/radiation effects , Sterilization/methods , Animals , Crops, Agricultural/chemistry , Crops, Agricultural/parasitology , Crops, Agricultural/radiation effects , Edible Grain/chemistry , Edible Grain/parasitology , Insecta/physiology , Water/chemistryABSTRACT
The results of experimental investigation of physical methods are presented for suppressing of biological activity of grain and grain product pests: harmful insects at each developmental stage except eggs (Insecta), mites (Arachnida, Acariformes) and microscopic fungi and bacteria. The technologies under development for disinfestation and disinfection of grain are based on irradiation of grain by modulated pulses of high-frequency (HF) electromagnetic fields and on simultaneous action of a complex of factors: vacuum and HF-field induced plasma. The threshold value of the electric field intensity for total insect mortality was found to be E = 4.0-5.0 kV/cm in the pulse mode at the base frequency of 47.5 MHz. When the combined technology is used, conditions are created in the irradiation chamber for HF-discharge and plasma formation, which are very strong factors influencing the biological organisms. These raise the energy (and cost) efficiency (approximately $2-3 per tonne of grain) of the combined technology for destruction of grain pests with complete environmental safety.
