In this paper a systematic study of individual single-walled and multi-walled carbon nanotubes was performed by Raman spectroscopy and high-resolution electron microscopy. We have presented the geometrical and electronic structure analysis on the examples of two tubes: individual single-walled and double-walled nanotubes. The role of different environmental effects and their influence on the final structure assignment are discussed. Moreover, we have shown that the Raman spectroscopy gives reliable estimations of the nanotube diameters and the conductivity. Given a non-destructible character of Raman spectroscopy, we may conclude that it is one of the most efficient methods for structure analysis of carbon nanotubes.

Keywords: Carbon nanotubes, Raman spectroscopy, electron microscopy

This article describes the model of the pseudorandom sequences (PRS) generator developed in OrCAD program suite.The described model is applicable for radio systems modules circuits simulation that are using in the operation a PRS. The PRS generator implementation in OrCAD make possible to change PRS parametres immediately in the program, without using other software. A model specificity is that it is parametrised. Parametrization facilitates model control and that is reduce to a minimum necessary manipulations for changing of PRS type. The model is constructed on the basis of circuitry implementation of the linear feedback shift register (LFSR). For adjustment of model it is enough to instal code words setting starting state a LFSR, parametres of a signal of a clock source and to specify register tap output. As an example, used a 16-bit LFSR to create maximum length PRS, tap sequence {0, 5, 9, 13}. Emulation results are presented.

Keywords: pseudorandom sequence, PRS generator, LFSR, OrCAD, circuit simulation

The represented approach of dynamic process modeling is based on the technology of automatical semantic text analysis. An associative network is forming during text processing. Its key notions, including  lexical and psycholinguistic markers of the analyzed process, are ranked by theirs semantic weight. The weight being multiplied by marker status value at the scale of “good-bad” gives its contribution to the process stage characteristic. Transformation of the accumulated for all of the markers process characteristic from one period of time to another one is characterize a direction of the process.

Keywords: automatical text processing, associative (homogenous semantic) network, process dynamic modeling, social processes, lexical and psycholinguistic markers

The article has received the further development of application technologies autonomous scripts for management of information resources of computer systems. Formalized behaviour of deterministic and stochastic autonomous scripts with the use of finite automata that enables you to develop models and technology for solving a wide class of problems of information resources management.

Keywords: autonomous scripts, theory of finite automata, the concept of frames slot, management of distributed information resources

The article considers the regulatory and estimated characteristics, as well as proposals for the estimate of the strength and deformability characteristics for possible practical inculcation of fiber concrete with aggregate distribution of fibers produced by the shuttle and conveyor technology, and reinforced concrete structures of them.

Keywords: regulatory, estimated characteristics, stress-strain diagram, compression, tension.

 An analysis of new methods and means for a mesurement of parameters of piezoelectric ceramic elements and materials is carried out. These methods and means are based on a digital principle of the construction of devices. An impuls with a linear frequncy modulation therein is used as an signal for exciting. Results of experimental studies on this subject are represented for discussion.     

Keywords: piezo ceramic element, piezo, methods and means of measurement, digital signal processing

We consider the problem of the use of adaptive autonomous scripts in the decision of problems of management of information resources of computer systems. Developed a conceptual model of adaptive autonomous script with use of frames and apparatus of finite automata, which expands the possibilities of automation of complex problems of information resources management  

Keywords: adaptive autonomous scripts, theory of finite automata, frame, slot, management of distributed information resources.

The proposed method of designing hardware components optical switching systems simplifies prototyping and development of systems of optical switching and multi-core VLSI. This method allows to automatically set parameters of the optical system at the design stage, depending on the requirements. This method may be cost-effective at the stage of technical specifications of the project, as will reduce the time required for its coordination between the customer and the design engineer.
At the heart of developing a method of designing systems, optical switching elements is a comprehensive analysis of the equations and functions describing the electrical and optical properties of laser heterostructures, as well as electro-optic modulators and Fabry-Perrot resonators. Fundamental static and dynamic characteristics of semiconductor diode lasers can be calculated by using a set of kinetic equations describing the interaction of electrons, holes and photons in the active layer of the laser structure. At various stages of this method is processing, evaluation and calculation of the main characteristics of the elements of integrated optical switching systems.  

Keywords: optical switching, integrated injection laser, quantum-scale heterostructure, amplitude modulation, terahertz range

In the article a double-gap cavity with anti-phase excitation that has wide application in designs of floating-drift klystrons is considered. One of the ways of reduction of time during machine design of klystron’s cavity is using of the simple analytical expression, allowing to determine the main klystron electrodynamic parameters with a sufficient accuracy for practice. In the article we presented the results of physical and mathematical modeling of the double-gap cavity, the corrected mathematical models were introduced that can be utilized in programs of a prompt optimization of klystron's type devices. The technique of creation of approximate mathematical model in this case was reduced to definition of basic analytical function, and the subsequent approximation between experimental and calculated data by means of a method of planned experiment. In presented work the analysis of adequacy was carry out. Analysis revealed inaccuracy of a resonance frequency of an anti-phase type in chosen ranges of change of influencing factors doesn’t exceed 1%, characteristic impedance- 5%. The received analytical ratios allow carrying out quickly calculation of parameters of the cavity, without labor-consuming and expensive experiments and calculations.

Keywords: double-gap cavity, electrodynamic parameters, mathematical simulation, resonance frequency, characteristic impedance, method of planned experiment

In this work we have investigated the structure of individual single-walled and multi-walled carbon nanotubes by high-resolution electron microscopy and electron diffraction. To grow carbon nanotubes we used a catalytic chemical vapor deposition method. It was shown, that this synthesis protocol gave in general single-walled and double-walled carbon nanotubes with a high level of crystallinity. The diameters of the nanotubes were in the range 1.5 - 7 nm. We also observed that there was a certain level of amorphous carbon deposited on the nanotube surface during the growth. In this work we also present the structure analysis of the double-walled carbon nanotube by means of electron diffraction. We show that the structural date derived from electron microscopy and electron diffraction agree within the experimental error.

Keywords: Carbon nanotubes, electron diffraction, electron microscopy

The atricle considers the problem of finding the best carrier. It describes by the expert method of solving the problem, as well as an algorithm for selecting a carrier. Describes a software module implemented with the involvement of technology ActiveX, which greatly simplifies the process and reduces the development time of projects. The proposed application allows you to define a list of the best carriers, ranked by rating according to the user's request.

Keywords: Carrier selection, expert method, weighting coefficient, rank, user application

The processes happening in system of power supply of the AVO electric drive of gas are considered. The analysis is carried out and the assessment of consumption of electric energy of AVO of gas is executed.

Keywords: compressor station, device of air cooling of gas, mathematical statistics

In article the description of models of adaptive management outlining the content electronic courses. Model based on the analysis of factor run content element and the factor of time interacting with the content element CEMA (classifiers events - management analyzer) for calculating an objective indicator of course studying result of user to send a learning management system (LMS). A model of the DCG (dynamic content generation) to localize errors in the develop electronic courses and to the human factor in learning process. Proposed criteria and shown one model implementation AMLM (adaptive management e-learning materials). Results of the study found use in educational institutions and commercial enterprises involved in the introduction of new technologies and improve efficiency in e-learning. Organizations interested in the development of services provided by e-learning and stimulating economic benefits will find helpful many aspects of this work for planning strategies for education and training of personnel companies-customers, students and the public. 

Keywords: education, e-learning, Learning Management System, electronic learning course, models of adaptive management outlining of content

The problems of finding and implementing provisions increasing the competitiveness of domestic production due to the effective capitalization of resources , which is a set of multi-level institutional processes and management actions to ensure efficient binding of economic resources for the modernization of innovation based on the reproduction processes in the enterprise. Shows a conceptual view of the process of strategy formation capitalization resource industries in the cluster. A scheme of structure-function relationships of subjects clustered relations conditional capitalization of resources.

Keywords: capitalization of resources, institutional bondage, clustering relationships, competitive potential, enterprise, innovation development

The paper describes the problems of information security of internet services when subjected to a distributed network attack. Describes the multi-agent model of attack. A system software simulated attack to study its properties in real time. The analysis of simulation results. An approach to maintain server stability under high load. Described hike proposed to implement on the basis of mechanisms of method "flood-gate".

Keywords: simulation, multagentnye systems, network threats, DDoS-attack, JADE, the stability of network services