• ## NUMERICAL ASPECTS FOR OBTAINING TWO-SIDED BOUNDS OF EIGENVALUES

pg(s) 104-107

In this paper a new algorithm and numerical approach which gives two-sided approximations of eigenvalues for second-order problem is presented. Conforming finite element methods are used in combination with an appropriate nonconforming interpolation. Numerical Aspects are discussed and also experiments which demonstrate the proposed algorithm are given.

• ## FORMATION OF PROJECT AND RESEARCH SKILLS OF STUDENTS IN CALCULATION OF LIMITS

pg(s) 108-110

The paper is devoted to the problem about formation of project and research skills of students of natural sciences direction, using project and research activities on the subject "Mathematical Analysis".

• ## SIMULATION AND SOFTWARE DEVELOPMENT FOR SOLVING INTERNAL BALLISTICS PROBLEMS

pg(s) 111-114

The problem of internal ballistics is considered, including basic pyrodynamic equation, law charge combustion, gasification law and equations of the projectile motion. A numerical method is used to solve a system of three algebraic and three ordinary differential equations. The software was developed and a number of computational experiments were made to analyze the influence of the charging parameter on the processes occurring during the projectile movement in the barrel channel. The problem of gunpowder burning and a finite-difference method to solve it are considered. The results of this work can be applied to the design of new types of trunks and charges.

• ## INCREASING POTENTIAL OF ROBUST STABILITY OF SYSTEM BY ONE PARAMETER IN A CLASS OF FOUR-PARAMETER STRUCTURALLY STABLE MAPPINGS

pg(s) 115-117

This article is about robust stable control system for objects with uncertain parameters with an approach to the choice of control laws in the class of four parametric structurally stable mappings, which allow increasing the robust stability potential and the quality of the control system. This article presents robust stability of a system with one input and one output in the class of catastrophe functions "parabolic umbilic". To study the robust stability of stationary states of the system, the main provisions of the Lyapunov function method are used.

• ## MAIN CHARACTERISTICS OF THE RADIATION FROM DOMESTIC EARTH

pg(s) 118-120

The basic radionuclides that cause natural radiation – potassium, uranium, radium, thorium, radon, thorom. Is described their content in different soils and rocks, as given more attention to potassium because it is the most widespread in the earth’s crust and its influence is strongest. An analysis of radiological monijoring of soils in Bulgaria in the past two years, which show that there is no deviation from the normal background values.

• ## THE ASSESSMENT ANTHROPOGENIC IMPACT OF INDUSTRIAL OBJECT FOR ECOLOGICAL SYSTEM BASED ON INTEGRATED CRITERION

pg(s) 121-124

This article explores the main problems of assessment of anthropogenic impact on the ecological system of the projected industrial facility. It proposed used as an indicator of environmental risk as an integral criterion. The calculation of risk is based on the method of "risk index".

• ## INTEGRATED PERFORMANCE MEASUREMENT SYSTEM

pg(s) 125-128

This work deals with issues concerning the performance measurement in SMEs. There has been a literature search of existing methods and practices for performance measurement. The Characteristics of Performance Measurement and Factors Influencing Performance Measurement in SMEs are studied. Concept and objectives of the Integrated performance measurement system are developed. The structure and configuration of the performance measurement system are conceptualized.

• ## RISK FACTORS INDUCED BY INSULATED MINE SELF-RESCUERS ON CHEMICALLY RELATED OXYGEN AFFECTING ON RESPIRATORY COMFORT

pg(s) 129-131

The high methane hazard of coal mines, despite safety measures, has led to a change in the structure of fatal injuries. More than 54% of miners die from carbon monoxide poisoning, which predetermines the need to study risk factors when activating a mine selfrescuer with chemically bound oxygen. These factors include normobaric hyperoxia, "nitrogen hazard", hyperoxic hypoxia, high temperature and dryness of the inhaled gas mixture, increasing hypercapnia, increased resistance to ventilation. The current situation predetermined the need to study the tolerability of physical loads when activating the mine self-rescuer. 18 healthy volunteers were examined. The obtained results demonstrated that already from 15 minutes the volume fraction of carbon dioxide begins to increase, indicating the formation of a "break point" of the mechanisms of voluntary control of breathing. The volume fraction of oxygen in the respiratory bag reaches its maximum values by the 25-35 minute and ranges from 96.0 to 97.3% v/v at a barometric pressure of 770.5 ± 1.70 mm Hg. Resistance to breathing during inspiration and expiration during physical exertion reached 77.5 ± 9.95 mm WG and 85.0 ± 9.06 mm WG, respectively, on the 30th minute. At the 40th minute, the aerodynamic resistance to ventilation reaches its maximum value and this zone can be considered as a kind of "reference point", with which deactivating of the self-rescuer due to severe dyspnea begins. Threat also consists in a decrease in the percentage of nitrogen in the gas mixture. Already from the level of 1.7 volume percent of the nitrogen content in the respiratory bag, the mine self-rescuer is deactivated under physical exertion. The main reason for stopping work is the lack of GDS for inhalation, which is probably due to micro-teleclactisation of the lungs and compensatory hyperventilation. Thus, the traditional system of training miners for the use of self-rescuers in emergency conditions does not allow miners to adequately compensate for the effects of negative factors associated with activation of the self-rescuer.

• ## COMPARATIVE STUDY OF NOISE MEASUREMENT IN WORK ENVIRONMENT WITH FREQUENCY WEIGHTINGS

pg(s) 132-135

The paper deals with the impact of noise (low frequency noise on threshold point) on human health and safety in the workplace. The first part of the article describes the main impacts of noise on human health – specific and systemic. Part of the paper is also the process of risk assessment according to the valid directive of the European Parliament and Council Directive 2003/10 / EC.

The paper deals with frequency weightings of low frequency noise. Authors describe frequency weightings A and Z and its difference in low frequency noise measurement and also the main goal of its usage. Part of article is experimental measurement of this noise in work environment.

• ## EXPERIENCE APPLICATION OF THE DUPLICATING WAY "WSEM-PC" FOR THE NOTIFICATION OF PEOPLE AT FIRE IN OFFICE BUILDINGS OF JSC RUSSIAN RAILWAYS

pg(s) 136-138

The results of the natural observation of evacuation of office buildings workers of JSC "Russian Railways" with application of various notification ways are presented in the article and the time of their response to a signal is defined. Confidential level of the possibility of use of the considered mathematical laws of distribution for the time of response description of the «Fire» signal depending on the notification way is determined. Based on the chosen law of distribution comparative assessment of efficiency of the notification at the fire depending on a notification way in comparison with standard values, and also the existing traditional ways of the notification has been conducted.

• ## CROWDSOURCING LANGUAGE RESOURCES FOR SPEECH RECOGNITION

pg(s) 139-142

An important part of any speech recognition system is a language model. Creation of a language model requires proper processing of large quantities of textual data. Part-of-speech tags, named entities or semantic roles in the text help with precise statistical language modeling. The natural language processing methods are usually trained on annotated text corpora. Annotation of text corpora or dictionaries is a difficult process that requires a lot of human work involved. Crowdsourcing is a specific sourcing model in which individuals or organizations use contributions of Internet users to create a specific knowledge base.

• ## SYMPTOMS OF VERBAL DYSPRAXIA IN CHILDREN DIAGNOSED WITH SPECIFIC LANGUAGE IMPAIRMENT (SLI)

pg(s) 143-146

The purpose of this article is to provide information on the study of deficits in the functioning of praxis in children diagnosed with Specific Language Impairment (SLI). The performance of three groups of language disordered children, divided by age, and the respective control groups on tasks related to articulation, speech motor control and diadochokinesis are put on discussion.

• ## ISLAM, THE BALKANS, IDENTITY

pg(s) 147-150

Even before the conquest of the Balkan peninsula was completed by the end of the 15 century, the Ottoman Empire was faced with the need to increase the Muslim component of the local population so as to affirm Ottoman power in the new lands. The central authorities, the army and the clergy began to systematically implement a policy of Islamization. Colonization and migration were among the factors that led to the settlement of a numerous Muslim population. Conversion to Islam was linked to certain advantages, such as pardon for violations of law, the distribution of offices and positions, assistance for impoverished new Muslims, inclusion in Ottoman military organizations such as the spahi, the janissaries, the yaya (peasant infantry), the muslem (autonomous peasant cavalry), the akinji (advance cavalry), the yuruks, etc. There was a merging of ethnic and religious identity stemming from the way in which the Empire was organized and from the importance of religion for the exercise of power. Religious affiliation became an ethnonym of power, and power was in Muslim hands. Evidently, the causes and factors of the conversion to Islam of part of the Balkan population have not been definitively clarified and will remain debatable if the explanation is looked for in “coercion” alone or in “voluntary choice” alone. Perhaps the causes might be related to the internal political strategy of the Ottoman state with regard to the numerous population of the Balkans as well as to the medieval religiousness of the peasants and the incapacity of the Orthodox Church, in its subordinate position, to maintain their faith and provide them with material assistance.