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Ruse, Bulgaria

"Angel Kanchev" University of Ruse is a public university in the city of Ruse, Bulgaria. The university was formed on 21 July 1995 by the dissolution of Higher Institute of Mechanical Engineering, Mechanisation and Electrification of Agriculture which was commonly known as with establishment date 12 November 1945. This was the first national higher technical school outside the Bulgarian capital. The University of Ruse employs 31 professors, 177 docents and another 85 assistants with Doctor of Science qualification. The tradition and the geography of the University of Ruse determine its mission and its strategic role of an educational, scientific and intellectual center of the Ruse region and northeast Bulgaria on the national and the international levels. The university has two subsidiaries structures in the cities of Silistra and Razgrad. University of Ruse was selected by the European Commission for the TEMPUS program of 18 universities from 11 Central European countries that have achieved the best results in the transformation of higher education. It is a regular member of the European Universities Association and of the Danube Rectors' Conference . It participates in CEEPUS, SOCRATES / ERASMUS and LEONARDO DA VINCI programs. International approval is to confirm that he built and developed as a modern university with European level of education. Due to the implementation of the credit system, the university has been conferred the ECTS label. Wikipedia.

Golemanova E.,University of Ruse
WSEAS Transactions on Computers

The paper describes one of the most researched techniques in solving Constraint Satisfaction Problems (CSPs)-searching which is well-suited for declarative (non-procedural) implementation in a new programming paradigm named Control Network Programming, and how this can be achieved using the tools for dynamic computation control. Some heuristics for variable and value ordering in backtracking algorithm, lookahead strategies, stochastic strategies and local search strategies are subjects of interest. The 8-queens problem is used to help in illustrating how these algorithms work, and how they can be implemented in Control Network Programming. Source

The world's fossil fuel reserves are limited and there has been intensive research to find out alternatives to fossil fuels. Hence, there is a progressive interest related to using non-fossil sources in vehicles. The biofuel is a major renewable energy source to supplement declining fossil fuel resources. Alcohols are an important category of bio-fuels. The ethanol and methanol have been good candidates as alternative fuels for the vehicles because they are liquid and have several physical and combustion properties similar to gasoline. That is why this study is aimed to develop the 1-D model of a four-stroke spark ignited engine for predicting the effect of various fuel types on engine performances and fuel consumption on various engine operating conditions. AVL Boost was used as a simulation tool to analyze the performance and emissions characteristics for different blends of ethanol, methanol and gasoline (by volume). The results obtained from the simulation of different fuel blends were compared to those of gasoline fuel. The results indicated that when alcohol-gasoline fuel blends were used, the brake power decreased and the brake specific fuel consumption increased compared to those of gasoline fuel. When fuel blends percentage increases, the CO and HC concentration decreases and there is a significant increase NOx emissions when fuel blends percentage increases up to 30% E30 (M30). © 2015 The Authors. Published by Elsevier Ltd. Source

Kodjikian L.,University of Ruse
Journal Francais d'Ophtalmologie

Toxoplasmosis is the most common etiology of posterior uveitis. Toxoplasma gondii infection during pregnancy means either primary infection and risk of congenital toxoplasmosis or acute retinochoroiditis in a pregnant woman (risk of transmission, severity of injuries, therapeutics). Ingestion or manipulation of raw or undercooked meat is responsible for most contaminations (one- to two-thirds) in pregnant women. Toxoplasmosis seroprevalence is high in Europe, up to 54 % in southern European countries. Primary prevention advice is proposed to immunocompetent pregnant women who are seronegative for toxoplasmosis. The risk of transplacental transmission congenital toxoplasmosis during pregnancy is analyzed. The ocular lesions include retinochoroiditis and a number of other lesions. The departments of ophthalmology and of parasitology of Croix-Rousse University Hospital (Hospices Civils de Lyon) is currently following one of the largest cohorts of children infected with T. gondii (430 children alive in 2005). Our overall transmission rate during primary infection was 30 %. Retinochoroiditis incidence was 24 % in our prospective cohort. During follow-up, recurrences appeared in 29 % of cases. Acute toxoplasmic retinochoroiditis in pregnancy could be a risk of transplacental transmission due to potential parasitemia. Practices in cases of suspected or proved congenital infection are discussed. The antiparasitic drugs authorized during pregnancy are azithromycin and pyrimethamine. Azithromycin can be used alone but an association with pyrimethamine during the second trimester is useful in case of macular threat. © 2010 Elsevier Masson SAS. All rights reserved. Source

Ivanov I.V.,University of Ruse
Computational Materials Science

Active Fibre Composites (AFC) are modelled by piezo-electric Finite Elements (FEs) and their effective properties are determined by FE analysis. Cracks in the piezo-ceramic fibres are introduced to the model and the effective properties are determined for different extent of the damages. A simplified FE shell-bar model of AFC is developed in order to replace this layer in the large-scale model of a multi-layered smart composite structure. A methodology to transfer the effective properties of the AFC determined in the FE analysis to the shell-bar model is developed. The shell-bar model of AFC allows the dynamic behaviour of a smart composite structure to be simulated by FE and investigated. © 2010 Elsevier B.V. All rights reserved. Source

The index gear drive potential is defined for the estimation of the quality of spur gear drives as a maximum contact ratio obtained at the contact of teeth profiles along the full line of action. In this paper, a new method is proposed for the geometric design of symmetric and asymmetric involute meshing in which the contact ratio of the gear drive is equal to its potential. This method is appropriate for the geometric design of spur gears with a small teeth number and is based on the generalized model of involute meshing. The gear drive potential is assigned as an input value, from which, after appropriate calculations, the geometry of rack-cutters, gears and involute meshing can be determined. Using the proposed method, the areas of the realized potential and the areas of the existence of involute gear drives are defined. In addition, many numerical examples are solved. In the cases of symmetric and asymmetric meshing, the minimum teeth number is obtained when the gear drive potential is larger than one. © 2010 Elsevier Ltd. Source

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