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

Proposed by parallel implementation structures aloritmicheskih simulating year-round circulation of water bodies. The research evaluation of computation time, find the optimal algorithm for the implementation of independent calculations for multi-core processors to reduce the computation time.

Keywords: parallelization of computations, thermohydrodynamics modeling of water objects, multi-core processors

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

In the paper we consider the energy efficiency of electric trains in overcoming the curved portion of the profile path. In this paper, were synthesized motion control algorithms that will help conserve energy resources by means of changes in traffic patterns electric depending on the profile path. The simulation electrorolling stock motion by offer the model showed a reduction in energy consumption compared to the nominal operation.

Keywords: energy efficiency, electric train, traffic management, motion control algorithms, reducing the consumption of energy resources

Chlorination is the most common, and in fact no alternative method of disinfection using in Baghdad water supply system. Thus there is an urgent need to control the trihalomethanes (THMs) in drinking water. One of the objectives of this study is to investigate the content of THMs in Baghdad water supply network. Studies showed that the substantial amount of THMs formed in water distribution system, THMs content tends to increase with the distance from the starting point coupled with a decrease of residual chlorine concentration. It is observed that in summer total THMs concentration growth rate in water supply network was 1.3-1.4 times higher than in winter as well as total amount of THMs increase by 30 percent in summer. It was found that the concentration of total THMs never exceeded 80 μg/l – the level specified in National Primary Drinking Water Regulations: Disinfectants and Disinfection Byproducts (Stage 1) established by USEPA. However, in summer total THMs concentration in the water always exceeded 40 μg/l – the level set in accordance with Stage 2 of this Rule. The most of total THMs (73-80%) were bromine compounds (CHCl2Br, CHClBr2 and CHBr3). It is shown that the most efficient way to reduce THMs in Baghdad water supply network is to use the chlorine dioxide for chlorination.

Keywords: chlorine dioxide, chlorination, drinking water, trihalomethanes (THM), water supply network, water supply system

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 discusses a method for optimizing the synthesis of digital state machines for solving tasks of search patterns with masks on FPGA using automatic models. Standard methods for the synthesis of the FPGA don't optimize digital state machines, but only optimize the placement of logic elements on the chip. The method of vectoring states involve the decomposition the structure of the machine and the combining the variety of states to the vertex-array of states. The states in the vertex-array is controlled by special state machine. This simplifies the addressing to the heights of states of the graph , and optimizes logical structure of machine. The number of states of the digital machine remains unchanged. Vectorization of states is simplifying the synthesis and control of state machine and reduces the number of logical elements.

Keywords: digital state machine, graph of digital state machine, synthesis of digital state machine, FPGA, reconfigurable computing system, pattern search, vectoring states of digital state machine.

The subject of the article is a two-level optimization system of thermal processing of pellets mode within an automated control system of technological process of a horizontal-grate machine. At the top level the problem of the static optimization of the mode is solved periodically  based on a  mathematical models of a technological zones. At the bottom level, the pellets layer's immeasurable parameters are estimated with a help of a state observer and the optimal thermal processing mode is being stabilized.

Keywords: horizontal-grate machine, mode optimization, mathematical model, state observer

The results of a patent search in the field of shut-off valve constructions for nuclear power plants, thermal power plants and main piping are given.

Keywords: Nuclear power plants, shut-off valve, construction, main piping

This article considers the causes of halitosis and methods of the diagnosis. Halitosis, syndrome of bad breath caused by pathological condition of the oral cavity or internal organs and systems, has a significant impact on the patient's social life. Analysis of the composition of exhaled air may become a promising way to diagnose halitosis, as the direct relationship between the compositions of molecules of oxygen, carbon dioxide, nitrogen oxides, ammonia etc. and the causes of halitosis were found. The article's authors review and analysis the methods of measurement of qualitative and quantitative composition of exhaled air. The most common methods include the use of electrochemical, optical sensors, infrared spectrometers and mass spectrometers. The latter method is positioned as the most optimal method of analysis of exhaled air due to its high accuracy, selectivity and sensitivity. The authors' portable mass spectrometer being developed is represented. At this stage it can detect traces of oxygen and carbon dioxide, which inject into the device through the capillary system or membrane one, in gas samples in real-time mode.

Keywords: diagnosis of halitosis, molecular biomarkers, analysis of exhaled air, portable mass spectrometer

Results of comparing the beamwidth and the concentration factor of receiving antenna wich were calculated using the metods of Bartlett and Prony when working on the background noise of the sea are considered. It was shown that efficiency parameter estimation signal sources using Prony methods is higher than when using the method of Bartlett.

Keywords: Prony algorithm, vector-scalar array,dynamc sea noise, the covariance, the flow of power

A mathematical model of heat transfer processes, the discrete model is based on the finite difference method, and the results of calculations of the temperature distribution also will be developed. In addition the program was created which allows to calculate the distribution of temperature over its entire length for given values ​​of insolation, ambient air temperature and air velocity inside the collector  

Keywords: mathematical modeling, finite difference method, heat transfer processes, solar collector

 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.

Advantages of being self-сщьзсештп concrete of the lowered density (LSUB) before heavy and light concrete are shined, characteristics of components ЛСУБа and influence of their quantitative contents are provided in a mix on properties of the fresh and hardened concrete. The optimum mode of warmly moist processing is offered.

Keywords: Self-compacting concrete, the supersoftener, knitting, filler, a volcanic tufa.