The local crystallization in nanoscale diamond-like carbon films during annealing

The local crystallization during annealing at 600° C in nanoscale diamond-like carbon coatings films grown by pulsed vacuum-arc deposition method was observed using modern techniques of high-resolution transmission electron microscopy. The crystallites formed by annealing have a face-centred cubic crystal structure and grow in the direction [011] as a normal to the film surface. The number and size of the crystallites depend on the initial values of the intrinsic stresses before annealing, which in turn depend on the conditions of film growth. The sizes of crystallites are 10 nm for films with initial compressive stresses of 3 GPa and 17 nm for films with initial compres- sive stresses of 12 GPa. Areas of local crystallization arising during annealing have a structure dif- ferent from the graphit

ПРОГРАММА ТЕПЛОВОГО РАСЧЕТА SEMISEL 4.1

New version of famous simulation tool for analysis of power losses and thermal modes of power converters.Тенденции современного рынка силовой электроники: сокращение сроков проектирования, рост плотности мощности и повышений требований по надежности, делают невозможным процесс разработки преобразовательных устройств без специализированного программного обеспечения. Компьютерные средства анализа тепловых режимов работы мощных конверторов предлагаются практически всеми основными производителями силовой элементной базы, наибольшей популярностью пользуются программы SEMIKRON (SEMISEL), Infineon(IPOSIM), Mitsubishi (MELCOSIM) [1-3]. Данная статья посвящена возможностям новой версии SEMISEL V4.1, выпущенной компанией SEMIKRON в 2012 году.Тенденції сучасного ринку силової електроніки: скорочення термінів проектування, зростання щільності потужності і підвищень вимог, по надійності роблять неможливим процес розробки преобразовательних пристроїв без спеціалізованого програмного забезпечення. Комп'ютерні засоби аналізу теплових режимів роботи потужних конверторів пропонуються практично всіма основними виробниками силової елементної бази, найбільшою популярністю користуються програми SEMIKRON (SEMISEL), Infineon (IPOSIM), Mitsubishi (MELCOSIM) [1-3].Дана стаття присвячена можливостям нової версії SEMISEL V4.1, випущеною компанією SEMIKRON в 2012 році

Nanostructured coatings based on amorphous carbon and gold nanoparticles obtained by the pulsed vacuum-arc method

Nanostructured coatings based on diamond-like carbon and gold-doped carbon with a thickness of 100-300 nm were obtained by a pulsed vacuum-arc method on silicon substrates. The structure of the coatingswas studied by high-resolution transmission electron microscopy, the elemental composition was studied by X-ray microanalysi

Palindromic Decompositions with Gaps and Errors

Identifying palindromes in sequences has been an interesting line of research in combinatorics on words and also in computational biology, after the discovery of the relation of palindromes in the DNA sequence with the HIV virus. Efficient algorithms for the factorization of sequences into palindromes and maximal palindromes have been devised in recent years. We extend these studies by allowing gaps in decompositions and errors in palindromes, and also imposing a lower bound to the length of acceptable palindromes. We first present an algorithm for obtaining a palindromic decomposition of a string of length n with the minimal total gap length in time O(n log n * g) and space O(n g), where g is the number of allowed gaps in the decomposition. We then consider a decomposition of the string in maximal \delta-palindromes (i.e. palindromes with \delta errors under the edit or Hamming distance) and g allowed gaps. We present an algorithm to obtain such a decomposition with the minimal total gap length in time O(n (g + \delta)) and space O(n g).Comment: accepted to CSR 201

INCREASING THE ENERGY INDICATORS OF CCGT UNITS IN SUMMER USING LITHIUM-BROMIDE REFRIGERATING MACHINE

The analysis of the modes of operation of CCGT‑230 in the summer operational period. It is shown that by cooling the air in front of the GTP compressor using ABCM, it is possible to maintain the calculated energy characteristics of the combined-cycle gas plant regardless of the outdoor air temperature.Проведен анализ режимов работы ПГУ‑230 в летний эксплуатационный период. Показано, что за счет охлаждения воздуха перед компрессором газотурбинной установки (ГТУ) с помощью абсорбционной бромистолитиевой холодильной машины (АБХМ) возможно поддержание расчетных энергетических характеристик парогазовой установки независимо от температуры наружного воздуха

A study of the influence of irradiation of carbon diamond-like coatings with nanosecond laser pulses on their structural-phase composition and tribological properties

Using the methods of Raman spectroscopy, optical metallography and scanning electron microscopy, combined with the measurements of tribological characteristics, special aspects of the formation of microrelief and variation of the structural-phase state of carbon coatings formed on the surface of AISI 321 heat-resistant steel by pulsed cathodic arc deposition followed by their irradiation with nanosecond laser pulses are studie

Features of forming an interaction network of an entrepreneurial structure

© 2015, Review of European Studies. All right reserved. The purpose of this article is aimed at identifying features of forming an interaction network of an entrepreneurial structure for developing real competition. The presented article defines the formation of different types of cross-cutting strategic management processes of an entrepreneurial structure with divergent interests of employers and hired managers. The basis of the presented work appears to be the use of modeling in the theory of relations between business structures. The paper presents a mechanism for forming an interaction network of an entrepreneurial structure with counterparties of direct exposure environment. This article is intended for managers, executives, researchers involved in entrepreneurial structures development

Investigation of the Structure and Properties of Coatings on Molybdenum Obtained in the Process of Low-Temperature Siliconizing in a Vibro-Boiling Bed

Образцы молибдена были подвергнуты низкотемпературному силицированию в виброкипящем слое в среде чистого кремния с использованием активатора NH4Cl при температурах 850, 900, 950 °C и выдержкой 120 минут. Проведены комплексные структурные исследования полученных покрытий методами РЭМ и РСФА. Рассчитаны константы скорости роста силицидного слоя MoSi2.Molybdenum samples were subjected to low-temperature siliconization in a vibrating-boiling pure silicon layer with NH4Cl activator at a temperature 850, 900, 950 °C with a holding time of 120 minutes. Complex structural studies of the obtained coatings were carried out and the growth rate constants of the MoSi2 layer were calculated

Multi-membership gene regulation in pathway based microarray analysis

This article is available through the Brunel Open Access Publishing Fund. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.Background: Gene expression analysis has been intensively researched for more than a decade. Recently, there has been elevated interest in the integration of microarray data analysis with other types of biological knowledge in a holistic analytical approach. We propose a methodology that can be facilitated for pathway based microarray data analysis, based on the observation that a substantial proportion of genes present in biochemical pathway databases are members of a number of distinct pathways. Our methodology aims towards establishing the state of individual pathways, by identifying those truly affected by the experimental conditions based on the behaviour of such genes. For that purpose it considers all the pathways in which a gene participates and the general census of gene expression per pathway. Results: We utilise hill climbing, simulated annealing and a genetic algorithm to analyse the consistency of the produced results, through the application of fuzzy adjusted rand indexes and hamming distance. All algorithms produce highly consistent genes to pathways allocations, revealing the contribution of genes to pathway functionality, in agreement with current pathway state visualisation techniques, with the simulated annealing search proving slightly superior in terms of efficiency. Conclusions: We show that the expression values of genes, which are members of a number of biochemical pathways or modules, are the net effect of the contribution of each gene to these biochemical processes. We show that by manipulating the pathway and module contribution of such genes to follow underlying trends we can interpret microarray results centred on the behaviour of these genes.The work was sponsored by the studentship scheme of the School of Information Systems, Computing and Mathematics, Brunel Universit

Implementasi Algoritma Advanced Encryption Standard (AES) 128 Untuk Enkripsi dan Dekripsi File Dokumen

Keamanan data atau informasi adalah hal yang sangat penting bagi pengguna jaringan internet saat ini. Kasus penyadapan akan pesan atau informasi merupakan salah satu hal yang sangat merugikan, dengan adanya kemungkinan terjadinya kejadian ini, maka perlunya peningkatan dalam hal keamanan pertukaran informasi menjadi penting. Pada saat ini, keamanan pertukaran informasi ini perlu mendapatkan perhatian khusus, maka penelitian ini akan membuat suatu implementasi kriptografi algoritma AES-128 untuk enkripsi dan dekripsi data yang berupa file dokumen (PDF, DOC, TXT). Algoritma Advanced Encryption Standard (AES) dipilih karena memiliki suatu tingkat keamanan pertukaran informasi yang cukup bagus, dan pada penelitian ini diuji coba file dokumen untuk melihat kecepatan waktu yang dibutuhkan selama proses enkripsi dan dekripsi