Field theory analysis and design of multiport branch-guide couplers for contoured beam antennas

A rigorous and efficient full wave theory of multiport branch-guide couplers for contoured beam antennas is presented. Contoured beam antennas find wide use in modern satellite communication systems. The key element of these antennas is a beamforming network incorporating multiport branch-guide couplers to generate the necessary amplitude and phase distribution on the aperture feed.The analysis of 2N-port branch-guide couplers is based on Galerkin's method taking into account the field edge condition and a generalized scattering matrix method. Numerical results are in a good agreement with the theoretical and experimental data of other works. Some optimized multiport branch-guide couplers are considered

Electrodynamic analysis of nanoscale antennas of millimeter and optical bands

Electrodynamic models and radiophysical properties of carbon nanotubes – vibrators (isolated on the substrate lattices), metallic optical antennas and optical antennas, formed from ZnO nanorods coated with metal films were developed and investigated. The models are based on numerically-analytical solution of integro-differential equations describing the diffraction of electromagnetic waves on impedance and dielectric bodies. Using the integral representations of the kernels of integro-differential equations allowed to overcome the difficulties of solution, associated with the singularity of kernels and to reduce the computation time for an order

The electromagnetic waves diffraction on finite aperture array

The diffraction both plane monochromatic wave and ultra short electromagnetic impulse is discussed. At the heart of the solution the method of integral equation in space-frequency and time-space representations is used. Integral equations are solved by the Galerkin’s method with Tchebyshev basis which is everywhere except corner points takes into account the field singularity at the metal edges. Moreover in time-space equations splines are used for approximation of time dependence solution. The methods of effective calculation of matrix elements in the system of linear algebraic equations are discussed. The C# program is worked out. The investigation results are given

The electromagnetic pulse diffraction on finite array of 2-D metal cylinders

The solution of diffraction problem of electromagnetic pulse on finite array of 2-D metal cylinders is done by the method of separation of variables. Two methods are used. First the diffraction problem is solved in frequency domain and with following Fourier transformation the scattered impulse is found out. Second the boundary problem is solved directly in time domain

Synergetic conception of electrodynamics of nonlinear parametrical zonal systems in higher zones of oscillations instability

The paper considers conception of synergetics conformably to investigation of nonlinear parametrical zonal systems operating on ultraharmonics in higher zones of oscillations instability as variety of resonance electromagnetic systems

Nonlinear composite media on opal matrixes and metallocarbon nanostructures

Examination of nonlinear periodic composite media based on opal matrices and metal-carbon nanostructures is conducted. This can constitute a new element base opening possibilities for the modern radioelectronics. The considered nanostructures have the substantial potential for their application in perspective nanotechnologies directed on creation of radioelectronic devices for SHF, EHF and HHF bands (microwave, sub-THz and THz ranges). They allow improving the functional characteristics of the arrangements made on their base. Nanostructures construction with preset properties is important for design of sub-THz and THz radioelectronics. Such properties can ensure an opportunity of nanostructures controlling, based on which it is possible to realize the nonlinear parametric zonal systems (NPS) resonance circuits functioning on current ultraharmonics in the highest zones of electromagnetic oscillations instability

Resonance phenomena in photonic and magnonic crystals of multiferroics as part of thin-film fractal structures

The paper examines nonlinear phenomena and effects in photonic and magnonic crystals of multiferroics being part of thin-film structures under exposure of external magnetic fields. The results of the fractal crystal modeling are analyzed. It is shown that for controllable smart coverings it is possible to employ the principle of reconfiguration of fractal antenna arrays with electronic commutation of subarrays. Development of a new element base on the basis of fractal photon and magnon crystals allows creating the newest devices of data processing and transmission

A comprehensive anticancer molecular study for genistein the promising anticancer drug

Objective Genistein a potent isoflavonoid isolated from dietary soybean with a wide range of biological and therapeutic activities, particularly, in cancer prevention. The molecular mechanism that explains this powerful chemopreventive activity is still not fully understood. The study designed to give a clear and complete picture about this mechanism using a flow cytometry analysis and a quantitative real-time PCR to investigate 16 gene families for 1023 genes. Methods Human cervical cancer cells were treated with genistein IC 50 for 48 h. Cell-cycle arrest and apoptosis induction were investigated using flow cytometry analysis. The high-throughput quantitative PCR array was used to explore the up- and down-regulated genes affected by the treatment. Results The quantitative real-time PCR analysis demonstrated the up- and down-regulation to 11 cancer-related gene families due to genistein treatment. Most of the up- and down-regulated genes have a role in cell proliferation, DNA replication and cell cycle progress. These findings were in harmony with the flow cytometry analysis in which a significant increase was manifested in the apoptotic cells (P < 0.05) of the treated cell cultures (18.34%) when compared with untreated cell cultures (5.7%). Conclusion The results highly pointed on the importance of genistein as promising anticancer drug. A comprehensive map regarding the anticancer molecular mechanism of this natural compound was given and many new therapeutic targets to control cancer development were uncovered. Keywords genistein, anticancer, cervical cancer, flavonoid