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Study on the Total Coliforms Count and Coli Titter in the Waters of Kardzhali Reservoir, Bulgaria
Oliver Y. Todorov,Ivan I. Iliev,Sonya K. Trifonova
Ecologia Balkanica , 2012,
Abstract: The aim of this study was to examine TC (total coliforms) and coli titter from two sampling stations in the aquatory of Kardzhali Dam Lake and one station in River Arda, in August, 2011. The values of the TC index in the reservoir vary from 1900±674 cfu/100ml in station I, to 1293±194 cfu/100ml in station II, while the TC value of River Arda reaches 1698±134 cfu/100ml. In Reservoir Kardzhali, the smallest volume of water in which Escherichia coli cells were found, varies between 5 and 15 ml, while for the River Arda the value of coli titter is equal to 1. With highest percentage, regarding the presence of microbiological species in the reservoir waters, is the genus Klebsiella (70%), followed by Citrobacter (15%), Enterobacter (10%) and Serratia (5%), respectively represented by the species Klebsiella oxytoca, Citrobacter freundii, Enterobacter cloacae and Serattia marcescens. In the river Arda two genuses were found - Serratia (50%) and Salmonella (50%).
Ultra Low-Power Acoustic Detector Applicable in Ambient Assistance Living Systems
Iliev I.
Bioautomation , 2009,
Abstract: Ambient Assisted Living (AAL) includes methods, concepts, systems, devices as well as services, which provide unobtrusive support for daily life based on the context and situation of the assisted person. The technologies applied for AAL are user-centric, i.e. oriented towards the needs and capabilities of the particular user. They are also integrated into the immediate personal environment of the user. As a consequence, the technology is adapting to the user rather than the other way around. The in-house monitoring of elderly or disabled people (hard of hearing, deaf, with limited movement ability), using intelligent sensors is a very desirable service that may potentially increase the user's autonomy and independence while minimizing the risks of living alone. The described ultra low-power acoustic detector allows upgrade of the presented warning systems. It features long-term autonomy and possibility to use it as an element of the wireless personal area network (WPAN).
Assisted Living Systems for Elderly and Disabled People: A Short Review
Ivo Iliev,Ivan Dotsinsky
International Journal Bioautomation , 2011,
Abstract: The number of elderly people living alone in their homes is permanently growing in the whole western world. Because of the deteriorating capabilities to sense and interact with the environment, such as memory, eye sight, hearing and mobility, the ageing populations often live with significantly degraded life quality. Many also suffer from chronic diseases that require medical treatment and periodical examinations. Different Assisted Living Systems have been proposed to cope with the problems. The goal is to enable the elderly people to live longer in their preferred environment, to enhance the quality of their live and to reduce the expenses of the public health care. The Assisted Living Systems are based on a lot of sensors, actuators and multimedia equipment, providing for the autonomy of people and assisting them in carrying out their daily activities together with available interaction with remote relatives and friends. The applied approaches and implementations are specific that limit the dissemination of the results between the object oriented groups. Besides, most of the projects require considerable funding for implementation. For the time being and especially for some countries with lower Gross Domestic Product, the efforts may be directed to creation of low-cost assistive systems performing some basic tasks, related to the need and health status of the living alone adults or disabled people, e.g. automatic fall detection and signalization, as well as instantaneous monitoring the photo-pletismographic signals together with permanently available communication interface between the caregiver and the user.
The radial velocities and physical parameters of HD 553
R. Duemmler,I. Kh. Iliev,L. Iliev
Physics , 2002, DOI: 10.1051/0004-6361:20021316
Abstract: HD 553 was discovered as an eclipsing binary by Hipparcos. Here, we present the first radial velocity curve for this system. It is found that HD 553 is a double-lined spectroscopic binary. Despite the large luminosity difference, the two components of the system are of very simmilar mass. The primary, a K0-giant, fills a large fraction of its Roche-lobe. The secondary is, despite its very similar mass, still a late-type dwarf. The radial velocity curve allows to constrain several stellar and system parameters.
Generalization of Ehrlich-Kjurkchiev method for multiple roots of algebraic equations
Anton I. Iliev
Mathematics , 2001,
Abstract: In this paper a new method which is a generalization of the Ehrlich-Kjurkchiev method is developed. The method allows to find simultaneously all roots of the algebraic equation in the case when the roots are supposed to be multiple with known multiplicities. The offered generalization does not demand calculation of derivatives of order higher than first simultaneously keeping quaternary rate of convergence which makes this method suitable for application from the practical point of view.
A Generalization of Obreshkoff-Ehrlich Method for Multiple Roots of Polynomial Equations
A. I. Iliev
Mathematics , 2001,
Abstract: In this paper we develop a new method which is a generalization of the Obreshkoff -Ehrlich method for the cases of algebraic, trigonometric and exponential polynomials. This method has a cubic rate of convergence. It is efficient from the computational point of view and can be used for simultaneous finding all roots if the roots have known multiplicities. This new method in spite of the arbitrariness of multiplicities is of the same complexity as the methods for simultaneous finding all roots of simple roots. We do not use divided differences with multiple knots and this fact does not lead to calculation of derivatives of the given polynomial of higher order, but only of first ones.
A Generalization of Obreshkoff-Ehrlich Method for Multiple Roots of Algebraic, Trigonometric and Exponential Equations
A. I. Iliev
Mathematics , 2001,
Abstract: In this paper methods for simultaneous finding all roots of generalized polynomials are developed. These methods are related to the case when the roots are multiple. They possess cubic rate of convergence and they are as labour-consuming as the known methods related to the case of polynomials with simple roots only.
Abundance analysis of Am binaries and search for tidally driven abundance anomalies - III. HD116657, HD138213, HD155375, HD159560, HD196544 and HD204188
I. Stateva,I. Kh. Iliev,J. Budaj
Physics , 2011, DOI: 10.1111/j.1365-2966.2011.20108.x
Abstract: We continue here the systematic abundance analysis of a sample of Am binaries in order to search for possible abundance anomalies driven by tidal interaction in these binary systems. New CCD observations in two spectral regions (6400-6500, 6660-6760 AA) of HD116657, HD138213, HD155375, HD159560, HD196544 and HD204188 were obtained. Synthetic spectrum analysis was carried out and basic stellar properties, effective temperatures, gravities, projected rotational velocities, masses, ages and abundances of several elements were determined. We conclude that all six stars are Am stars. These stars were put into the context of other Am binaries with 10 < Porb < 200 days and their abundance anomalies discussed in the context of possible tidal effects. There is clear anti-correlation of the Am peculiarities with v sin i. However, there seems to be also a correlation with the eccentricity and may be with the orbital period. The dependence on the temperature, age, mass, and microturbulence was studied as well. The projected rotational velocities obtained by us were compared to those of Royer et al. (2002) and Abt & Morrell (1995).
Search for the 3He isotope in the atmospheres of HgMn stars
I. Stateva,T. Ryabchikova,I. Iliev
Physics , 1998,
Abstract: We carried out a detailed analysis of the helium lines at 4921, 5876 and 6678 A in the spectra of the HgMn stars HD 58661, HD 172044, HD 185330 and HD 186122. For the first of these lines, the isotopic shift reaches +0.33 A for pure 3He, while for the last one, the maximum shift is +0.50 A. The 5876 line does not show any significant isotopic shift and is chosen for comparison. No trace of 3He was found in the atmosphere of HD 172044, while its presence was confirmed in HD 185330. This isotope is clearly present in the atmosphere of HD 58661. The results obtained for HD 186122 were ambiguous, 3He being apparently present in the 4921 line but not in the 6678 line, possibly because the latter is very weak.
Shell signs in the hydrogen-line spectrum of some lambda Bootis-type stars
I. Kh. Iliev,I. S. Barzova
Physics , 1998,
Abstract: The hydrogen-line spectrum of eight lambda Boo type stars is studied. The observed H_delta and H_gamma profiles are compared with Kurucz's theoretical profiles. The existence of weak emission-like details in the cores of five lambda Boo stars is demonstrated. The Inglis-Teller formula is used to calculate the electron densities. It is found that electron densities in the atmospheres of stars with peculiar H-line profiles are twice lower than in stars with normal profiles. The conclusion is made that stars with peculiar profiles exhibit some of the characteristics usually observed in stars with extended atmospheres.
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