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Possibility of excitation of the two-frequency mode of oscillations during stabilization of a Gunn oscillator by two resonators is shown. The frequency spacing and, also, influence of voltage supplied to the Gunn diode on frequency characteristics of resonators are investigated.
We consider a number of issues relevant to practical application of the microwave spectrum analyzer, which is made using a digital frequency synthesizer oscillator with a high resolution of (less than 1 Hz) and low phase noise. We developed a frequency synthesizer using a two-loop PLL synthesizer and direct digital synthesis (DDS) on the elemental basis of a high degree of integration, which allowed...
On the basis of quantum-field methods the statistical theory of the complex nano-scale systems, whose thermodynamic potentials do not have the property of additivity, was developed. It is shown that taking into account the non-additivity parameter for the statistical distribution does not change the equations of evolution, while the probability of different phase trajectories depends strongly on this...
An engineering method for simulating nanoradio and active elements based on resonant-tunneling structures (RTS) was proposed. Its possibilities for calculating the main characteristics of these devices were illustrated.
The physical basics and construction of the accumulative plasma-condensate systems (APCS), in which there is a dissipative self-organization of critically low steady-state supersaturation, have been set out. On the example of Ti, Al, Cr, Cu, and C quasi-equilibrium condensation we determined formation mechanisms of low-dimensional 3D-systems. The interdependence of conservative and dissipative self-organizations,...
The possibilities of using the conic coaxial resonant structures excited in high-Q oscillation modes, for developing resonant measuring transducers for a scanning microwave microscope are analyzed.
Dielectric resonances of thin anisotropic substrates are analyzed. It is shown that substrate orientation in a cylindrical shielding cavity influences the field distribution, coupling and excitation conditions, resonance frequency and quality factor of its TE01δ resonance mode. The HE11δ mode is split in two resonances whose intensities depend on substrate orientation and thickness. The optimal ways...
A set of methods and algorithms for automated compilation of abstracts of voluminous documents are elaborated. A software package against a dissertation array has been developed. A distinctive feature of this paper is to indicated that the experts who are faced with a heavy inflow of these may well use these methods in their practical work.
The report presents the approach to the calculation tasks for knowledge portal models designing (using the portal in the fields of strength of materials). The meta-model of calculation tasks is described.
The problem of analyzing and synchronizing the self-learning decision-making support system (DMSS) which is used in a telecommunication system as a GRID-service center is being discussed within the scope of the information-extreme intellectual technology.
The construction of the laboratory multiplatform grid system based on the MPICH-2 is completed. The research performance of a grid-system vs. the number of nodes and bandwidth is studied.
This paper presents a method of an Internet knowledge portal design in the field of Antarctic research. As a portal's information model ontology is used, it serves to represent the concepts necessary for the understanding of knowledge in the field of Antarctic research, and for running in the framework of its data.
In order to study the state of congestion in the TCP/IP networks designed discrete nonlinear system. The adequacy of the developed system is confirmed. Can be used for the synthesis of robust controllers for queue management.
The method of state estimation of telecommunication GRID-system nodes to increase effectiveness of allocation tasks planning is proposed. Estimation of current state of GRID-network and utilization of its resources implements within the framework of information-extreme intelligent technology of analysis and synthesis of learning systems.
A backward (BW) algorithm to generate the optimum syndrome trellis for soft-decision decoding of non-binary linear block codes is proposed. The BW-algorithm is an inherent part of the elaborated sliding-sweep method to simplify the aposteriori probabilities (APP) calculus. Decision making is based on log-likelihood ratio (LLR).
The method of forming of microwave signals with a small step of frequencies grid and improved noise characteristics is considered. This method is applicable to measurement technique, and also it solves problems of telecommunication, increasing the number of channel in microwave band.
The paper presents the results of investigation into the intersymbol and interchannel interference on an autobahn when a mobile terminal moves at a speed of up to 300 km/h.
The article concerns the use of permutations as the error-correcting code. Assessment of structural redundancy of permutations is made. Based on the analysis of errors occurring in the process of the permutations transfer, the rate of detected errors in the code on permutations is studied.
This paper deals with the problem of intermodulation interferences in the receiving path of an active antenna array. The authors have proposed algorithm of the antenna array spatial structure adaptation which allows increasing active and intermodulation interference immunity.
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