RF installation for the grain disinfestation
The ecologically pure method of grain product disinfestations through the grain treatment with the RF electric field is described. The experimental data obtained showed that with strengths of the electrical RF field of E=5 kV/cm and frequency of 80 MHz the relative death rate is 100%. The time of th...
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| Дата: | 2001 |
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України
2001
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| Назва видання: | Вопросы атомной науки и техники |
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| Цитувати: | RF installation for the grain disinfestation / B.V. Zajtzev, V.A. Bomko, V.M. Rashkovan, A.F. Kobetz, B.I. Rudiak, L.A. Bazyma, A.V. Basteev, M.S. Lesnykh, O.O. Mishchenko, V.G.Zhuravlev, E.D. Marinina // Вопросы атомной науки и техники. — 2001. — № 3. — С. 118-120. — Бібліогр.: 5 назв. — англ. |
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irk-123456789-792502015-03-31T03:02:11Z RF installation for the grain disinfestation Zajtzev, B.V. Bomko, V.A. Rashkovan, V.M. Kobetz, A.F. Rudiak, B.I. Bazyma, L.A. Basteev, A.V. Lesnykh, M.S. Mishchenko, O.O. Zhuravlev, V.G. Marinina, E.D. The ecologically pure method of grain product disinfestations through the grain treatment with the RF electric field is described. The experimental data obtained showed that with strengths of the electrical RF field of E=5 kV/cm and frequency of 80 MHz the relative death rate is 100%. The time of the grain treatment in this case is 1 sec. The pulses with a duration of 600 μs and repetition rate of 2 Hz were used, the duration of the front was 10 μs. The schematic layout of installation with a productivity of 50 tones/h and power of 10 kW is given. 2001 Article RF installation for the grain disinfestation / B.V. Zajtzev, V.A. Bomko, V.M. Rashkovan, A.F. Kobetz, B.I. Rudiak, L.A. Bazyma, A.V. Basteev, M.S. Lesnykh, O.O. Mishchenko, V.G.Zhuravlev, E.D. Marinina // Вопросы атомной науки и техники. — 2001. — № 3. — С. 118-120. — Бібліогр.: 5 назв. — англ. 1562-6016 PACS numbers: 29.17.+w http://dspace.nbuv.gov.ua/handle/123456789/79250 en Вопросы атомной науки и техники Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine |
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DSpace DC |
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English |
| description |
The ecologically pure method of grain product disinfestations through the grain treatment with the RF electric field is described. The experimental data obtained showed that with strengths of the electrical RF field of E=5 kV/cm and frequency of 80 MHz the relative death rate is 100%. The time of the grain treatment in this case is 1 sec. The pulses with a duration of 600 μs and repetition rate of 2 Hz were used, the duration of the front was 10 μs. The schematic layout of installation with a productivity of 50 tones/h and power of 10 kW is given. |
| format |
Article |
| author |
Zajtzev, B.V. Bomko, V.A. Rashkovan, V.M. Kobetz, A.F. Rudiak, B.I. Bazyma, L.A. Basteev, A.V. Lesnykh, M.S. Mishchenko, O.O. Zhuravlev, V.G. Marinina, E.D. |
| spellingShingle |
Zajtzev, B.V. Bomko, V.A. Rashkovan, V.M. Kobetz, A.F. Rudiak, B.I. Bazyma, L.A. Basteev, A.V. Lesnykh, M.S. Mishchenko, O.O. Zhuravlev, V.G. Marinina, E.D. RF installation for the grain disinfestation Вопросы атомной науки и техники |
| author_facet |
Zajtzev, B.V. Bomko, V.A. Rashkovan, V.M. Kobetz, A.F. Rudiak, B.I. Bazyma, L.A. Basteev, A.V. Lesnykh, M.S. Mishchenko, O.O. Zhuravlev, V.G. Marinina, E.D. |
| author_sort |
Zajtzev, B.V. |
| title |
RF installation for the grain disinfestation |
| title_short |
RF installation for the grain disinfestation |
| title_full |
RF installation for the grain disinfestation |
| title_fullStr |
RF installation for the grain disinfestation |
| title_full_unstemmed |
RF installation for the grain disinfestation |
| title_sort |
rf installation for the grain disinfestation |
| publisher |
Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| publishDate |
2001 |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/79250 |
| citation_txt |
RF installation for the grain disinfestation / B.V. Zajtzev, V.A. Bomko, V.M. Rashkovan, A.F. Kobetz, B.I. Rudiak, L.A. Bazyma, A.V. Basteev, M.S. Lesnykh, O.O. Mishchenko, V.G.Zhuravlev, E.D. Marinina // Вопросы атомной науки и техники. — 2001. — № 3. — С. 118-120. — Бібліогр.: 5 назв. — англ. |
| series |
Вопросы атомной науки и техники |
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| fulltext |
RF INSTALLATION FOR THE GRAIN DISINFESTATION
B.V. Zajtzev, V.A. Bomko, V.M. Rashkovan, A.F. Kobetz, B.I. Rudiak, L.A. Bazyma,
A.V. Basteev, M.S. Lesnykh, O.O. Mishchenko, V.G.Zhuravlev, E.D. Marinina
NSC "Kharkov Institute of Physics and Technology”
1, Academicheskaya Str., Kharkov, Ukraine, 61108
E-mail: nsc@kipt.kharkov.ua
The ecologically pure method of grain product disinfestations through the grain treatment with the RF electric field
is described. The experimental data obtained showed that with strengths of the electrical RF field of E=5 kV/cm and
frequency of 80 MHz the relative death rate is 100%. The time of the grain treatment in this case is 1 sec. The pulses
with a duration of 600 μs and repetition rate of 2 Hz were used, the duration of the front was 10 μs. The schematic
layout of installation with a productivity of 50 tones/h and power of 10 kW is given.
PACS numbers: 29.17.+w
The most common method for combating grain pests
is currently a chemical treatment with poisoning sub-
stances. First of all, this method is harmful for personnel
maintenance. Moreover, a part of poisoning substances
remains in the treated grain and enters the human and
animals' bodies.
A method of the grain treatment with hard gamma
rays is known. However, in this case the personnel also
undergo the harmful influence of the gamma rays. Be-
sides, this method had not received wide recognition be-
cause of high cost of equipment, high power consump-
tion, and because of large weight and overall sizes of
the installation, which does not permit to made a mov-
able installation.
A new, most promising method of the grain and
grain product treatment is the method, in which the
grain containing the pests is subjected to the RF electric
field. There are two approaches to the application of the
RF field. With the first the RF field influence on the
treated stuff causes considerable heating of the living
things that causes their death. As the grain itself pos-
sesses the less dielectric constant than that of insects [1]
it is not heated considerably.
The second method is of a great interest as it does
not cause the heating of the biologic object in such ex-
tent, and does not lead to the death of the living thing.
For example, the application of the RF fields of
5.107-108 Hz, which satisfy the relationship hν < kT,
where hν is the energy of the RF field quantum, and T is
the absolute temperature of the treated body, has a spe-
cific effect on the biologic objects that cannot be ex-
plained only from the thermal influence of the RF field.
The influence occurs at the energy levels several orders
lower than those where the heat causing the destruction
of the living thing is generated. It is clear that in this
case some nonthermal mechanism works of the RF field
influence on the organic matter. As for the essential dif-
ference between thermal and nonthermal mechanisms of
the RF influence there is presently no consistent theory,
which would explain the nonthermal effect of the pulsed
electric field on the pests; however, there are several hy-
potheses for explanation of this phenomenon [2, 3, 4, 5].
The supposition exists that in this case the irreversible
changes in the biologic object, which lead to its destruc-
tion, occur at the cell level (or at the molecular level),
and depend on the RF field frequency and amplitude. In
the given paper the experimental results obtained with
the RF equipment of the linear ion accelerator (LUMZI)
at the NSC KIPT together with the Institute of the Vet-
erinary Medicine are presented. The specialists from the
Institute of the Veterinary Medicine carried out experi-
ments to evaluate the efficiency of this method. As it
was mentioned above, in the experiment the pulse (non-
thermal) nature of the RF field influence on insects was
studied.
Preliminary experiments were performed on the
feeder channel of the RF supply generator of the
LUMZI. All experimental batches of the grain infested
with pests were prepared at the Institute of the Veteri-
nary Medicine, and after irradiation at the installation
were studied and compared with the control samples.
The samples of the infested grain packed in small di-
electric containers (about 20-30 grams each) were
placed inside the feeder channel of the RF generator
working on the active load. The generator operated in
the pulsed mode. The pulse duration was 600 µs, the
front length was 10 µs. The range of the pulse frequency
was 1-5 Hz. The amplitude of the RF field acting on the
sample could be changed with the irradiating sample
shift between the central and external feeder wire along
the radius. The field amplitude at the point of the sam-
ple location was calculated. The operating generator fre-
quency in these experiments was 47 MHz. In the Table I
the data obtained in the experiments are given.
Table I. f = 75 MHz , 2 pulses/s
E,kv/cm 3.5 5.0 10.0 20.0 30,0
Mortalitu (%) 92 100 100 100 100
The mortality of insects in the treated grain samples
was determined as a function of the exposition and am-
plitude of the acting RF field. From the Table I one can
see that the mortality increases with the RF field
strength and has a maximum value (∼60-70%) with the
field strength about E = 4 kV/cm (the averaged value of
E along the length of the sample is given). Increase in
the generator power (the flux of the RF energy through
the sample) does not cause increase in the mortality of
insects.
As the RF field strength in the coaxial feeder varies
from Emax at the central wire to Emin at the external wire
it is impossible to provide the uniform irradiation of the
ВОПРОСЫ АТОМНОЙ НАУКИ И ТЕХНИКИ. 2001. №3.
Серия: Ядерно-физические исследования (38), с. 118-120. 118
infested grain with the coaxial feeder. For the uniform
irradiation of the grain and for the examination of the
insects' mortality with further increase of the RF field
strength in the region of the irradiation, the authors de-
signed an irradiating chamber where the goal was
achieved using the physical properties of RF cavities.
The schematic layout of the chamber at which the fol-
lowing experiments were carried out is given in the
Fig. 1.
Fig. 1. Sketch of the treatment device.
In the experiments the irradiated sample was placed
between the plates of the capacitor that was a load for a
quarter-wave coaxial resonator. The application of the
coaxial resonator with a plate capacitor as a resonance
load of the RF generator enabled obtaining the RF field
strength from 0 to 30 kV/cm in the region of the grain
irradiation. With that, taking into account the resonance
nature of the generator load the power consumption was
essentially less than in the experiments with the coaxial
feeder. In the Table II the experimental data obtained at
the installation with the plate capacitor are presented.
Table II, f = 47.7 MHz, τp = 600 µs
Expositio
n, sec
5 10 20 60 60 60
Voltage,
kV
10 10 10 10 8 5
E, kV/cm 3.2 3.2 3.2 3.2 2.6 1.7
Ppulse,
kW/cm2
138 277 554 1162 456
Mortality 93.5 98.9 98.2 83.1 58.1 71.4
The RF field strength in the region of the irradiation
was calculated similarly to the experiments on the first
installation. One can see that as the field energy increas-
es the rise in the relative mortality of the insects occurs,
and with the field strength of 5-5.5 kV/cm becomes
100%. To obtain such an effect only 2-3 pulses is suffi-
cient.
With that the increase in the generator power does
not result in the essential changes in the relative mortali-
ty of the insects. The functions obtained in experiments
are shown in Fig. 2 and 3.
Fig. 2. The weevil mortality dependence on electric
field intensity.
Fig. 3. The weevil mortality dependence on RF Pow-
er.
As the pulse duration of the RF field was 600 µs and
was not regulated, it can be assumed from the results in
Figure 3 that to obtain the 100 % death of the insects the
pulse duration may be reduced, i.e. the power consump-
tion may be decreased.
1 2 3 4
5 6 7 8
9 10 11
Fig. 4. The simplified block-diagram of the installation:
1 - power transformer, 2 - AC/DC convertor,
3 - timing device, 4 - RF generator, 5 - pulse output
transformer, 6 - artifical line, 7 - signalling and in-
terlock, 8 - reception facility, 9 - device of a grain
treatment, 10 - grain reception.
119
The performed experiments showed that the de-
scribed method of the RF treatment of the grain aimed
to its disinfestation is competitive with traditional meth-
ods, and after a number of experiments on the optimiza-
tion of the parameters of the irradiating installation and
the RF generator may form a basis for the development
of a commercial installation. The authors calculated the
RF installation for the grain disinfestation with capacity
of 50 tones/hour and power consumption of 10 kW. In
the Figure 4 the simplified diagram of the installation is
given.
The estimated cost of the installation is $40,000. The
treatment of the 1 tone of the grain is about $2.
REFERENCES
1.S.O.Nelson. Insect control studies with microwaves
and other radiofrequence energy // Bulletin of the Ento-
mology Society of American. 1973, v. 19 (3), p. 153-
163.
2.A.S.Presman. Electromagnetic fields and nature.
Moscow: “Nauka”, 1968.
3.I.Takashima. Physical Principles and Techniques of
Protein Chemistry. New York – London: Academic
press, 1969.
4.S.A.Galdblit, D.Wany // Nature. 1968, v. 183, p. 905.
5.H.P.Schwan // IEEE Transaction Microwave Theory
and Techniques. 1971, MTT-19, № 2, February.
120
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