Physical principles of plasma antenna operation Gusein-Zade, N. G.; Minaev, I. M.; Rukhadze, A. A. ...
Journal of communications technology & electronics,
10/2011, Letnik:
56, Številka:
10
Journal Article
Recenzirano
Basic principles of operation of plasma antennas based on volume and surface plasma waves are presented. It is demonstrated that the efficiency of plasma antennas does not yield to that of metal ...antennas and that the controllability (frequency tuning for reception and transmission) and radar invisibility (a small radar cross section) are significantly higher. Plasma antennas of two types are considered: dipole antennas operating based on the surface plasma wave, and slotted waveguide antennas operating based on the volume plasma wave.
Reflector plasma array antennas Kuz’min, G. P.; Minaev, I. M.; Rukhadze, K. Z. ...
Journal of communications technology & electronics,
05/2012, Letnik:
57, Številka:
5
Journal Article
Recenzirano
A reflector plasma array antenna is investigated. A plasma array with a controlled pattern is created with the help of a discharge creeping over a dielectric surface. The scattering microwave ...radiation pattern is calculated for the vertical and horizontal polarizations of the radiation incident on the plasma array.
Introduction. The prognosis for surgical treatment of locally advanced gastric cancer remains disappointing. Neoadjuvant chemo-radiation therapy is relatively new and the least researched method of ...treatment, it is attracting more and more attention, mainly abroad in recent years. The aims of neoadjuvant therapy is the earliest start of systemic therapy, damage of the primary tumor and regional metastases, an increase in the percentage of radical operations, improving treatment outcome. Material and methods. The planning study is a multicenter, randomized clinical phase II trial. Patients of the first (experimental) group will be treated as the followes: neoadjuvant chemo-radiotherapy (total tumor dose of 46 Gy in 23 fractions with the concurrent modified CapOX scheme) followed by D2 gastrectomy and adjuvant chemotherapy. Patients of the second (control) group will be treated with D2 gastrectomy and adjuvant chemotherapy. Adjuvant chemotherapy will be carried out under the following schemes (optional for the researchers): CapOX or FOLFOX. Toxicity evaluation of neoadjuvant chemo-radiotherapy and adjuvant chemotherapy will be conducted with NCI CTC Toxicity Scale Version 3.0. The main objectives of the trial are to assess the safety and immediate effectiveness of neoadjuvant chemo-radiotherapy according to the criteria of the frequency and severity of postoperative complications and mortality, and tumor response. We are planning to include 80 patients with morphologically confirmed gastric cancer сT2–4N1–3, сT3–4N0–3; М0. The proposed trial will be carried out in accordance with the principles of the Helsinki Declaration, it has been approved by local ethic committees of the participated institutions. Results. As a result of this multicenter randomized trial it is planned to show the reproducibility of obtained in MRRC and a number of foreign centers results – that is, the safety and high immediate effectiveness of neoadjuvant chemo-radiotherapy in patients with locally advanced gastric cancer. Conclusion. If we reach the goals of the planning trial, the results would allow to reasonably recommend the start of large international phase III trials for the final evaluation of the proposed neoadjuvant treatment as a standard one in patients with locally advanced gastric cancer.
A plasma receiving dipole antenna Minaev, I. M.; Gusein-zade, N. G.; Rukhadze, K. Z.
Plasma physics reports,
10/2010, Letnik:
36, Številka:
10
Journal Article
Recenzirano
Results from experimental studies of a short-wave plasma dipole transceiver antenna are presented. The efficiency of the plasma receiving antenna is estimated, and the optimal frequency range for ...excitation and reception under the given experimental conditions is determined.
The possibility of controlling the directional pattern of a multislot waveguide antenna with the help of a gas-discharge tube placed inside the waveguide was studied experimentally. Since the ...dielectric parameters of the waveguide depend on the plasma density in the discharge column, they can be controlled by varying the discharge current. The high efficiency of such plasma control was demonstrated experimentally: as the discharge current was varied from 0 to 200 mA, the antenna directional pattern turned by ∼17°.
Basic principles of plasma antennas operating on bulk and surface plasma waves are described. It is shown that the efficiency of plasma antennas is highly competitive with that of metal antennas and ...their controllability is far superior. Two types of plasma antennas are considered, i.e., the dipole ones operating on the surface plasma wave and the waveguide slot antennas operating on the bulk plasma wave.
Coulomb explosion of a metal exposed to an intense picosecond laser pulse is numerically simulated using a plasma layer as an example. It is shown that plasma electrons leave the plasma layer under ...the action of the ponderomotive force opposing the laser radiation field gradient, whereas plasma ions fly away in the field of the self-space charge.
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