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Search Results: 1 - 10 of 402 matches for " Kiril DIMITROV "
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Scientific Annals of the Alexandru Ioan Cuza University of Iasi : Economic Sciences Series , 2011,
Abstract: This article presents the results of a survey of Bulgarian industrial organizations with respect to their clashes with the world financial and economic crisis’s effects on local economy. The crisis manifestations under business environment specificity factors and important cultural aspects of dominating managerial behavior in these companies are described and analyzed. The concrete research encompasses two groups of industrial companies, representing two opposite views to crisis – as a threat or as an opportunity. Attitudes to crisis, undertaken anti-crisis measures in key functional areas, preferred strategic moves of these companies are surveyed, analyzed and summarized, i.e. unravelling dominating attitudes among the majority of managers to perform serious cuts in expenditures in important functional spheres as human resources, investments, innovations, marketing, etc., and also noticing the minority of organizational leaders that accept the challenges of re-inventing current business models and/or re-formulating company vision and mission statements.
Scientific Annals of the Alexandru Ioan Cuza University of Iasi : Economic Sciences Series , 2010,
Abstract: This article presents the results of a survey of corporate social responsibility activities, undertaken by a group of business entities in Bulgaria in the context of great political, economical and cultural changes that the country has been passing through from 1990 up to date, and that affected the organizational behaviour of locally operating companies, as well as the beliefs, values and underlying assumptions of the individuals, working there. Environmental factors, influencing the initiated corporate social responsibility activities, and potential reasons of undertaking corporate social responsibility initiatives by local managers are identified and analyzed. The concrete survey seeks the reasons for initiation of company philanthropic programs, the preferred spending destinations for the companies in their philanthropic undertakings, the constituencies and considerations of greatest importance for business entities in this sphere, and an appraisal of the effectiveness of the philanthropic programs, started by the companies.
Electromagnetic nature of nuclear forces and the toroid structure of the helion and the alpha particle  [PDF]
Kiril Kolikov
Natural Science (NS) , 2012, DOI: 10.4236/ns.2012.47065
Abstract: In the present paper, we consider the nucleons in the helium-3 and helium-4 nuclei as tori. These tori rotate with constant angular velocity around an axis, which is perpendicular to the rotation plane and passes through the centre of mass of the nuclei. Based on exact analytical expressions for the electrostatic interaction between two spheres with arbitrary radii and charges derived by us recently, we find that the well-known potential binding energy for the helion and for the alpha particle is of electromagnetic character. Using the above mentioned formulae, we find the interaction force in the nuclei under consideration. Our toroid model recovers the basic experimental results not only for the binding energy, but also for the stability, radii, spins and the magnetic moments of the helion and the alpha particle.
Complex Formation in a Liquid-Liquid Extraction System Containing Cobalt(II), 4-(2-Pyridylazo)resorcinol, and Nitron
Petya Vassileva Racheva,Kiril Blazhev Gavazov,Vanya Dimitrova Lekova,Atanas Nikolov Dimitrov
Journal of Materials , 2013, DOI: 10.1155/2013/897343
Abstract: Complex formation and liquid-liquid extraction were studied in a system containing cobalt(II), 4-(2-pyridylazo)resorcinol (PAR), 1,4-diphenyl-3-(phenylamino)-1H-1,2,4-triazole (Nitron, Nt), water, and chloroform. The effect of some experimental parameters (pH, shaking time, concentration of PAR, and concentration of Nt) was systematically investigated, and the optimum conditions for cobalt extraction as an ion-association complex, (NtH+)[Co3+(PAR)2], were found. The following key equilibrium constants were calculated: constant of association , constant of distribution , and constant of extraction . Beer’s law was obeyed for Co concentrations up to 1.7?μg?mL?1 with a molar absorptivity of L mol?1?cm?1 at ?nm. Some additional characteristics, such as limit of detection, limit of quantification, and Sandell’s sensitivity, were estimated as well. 1. Introduction Cobalt is a transition metal which plays an essential role in industry and all living organisms. Its main applications are in the production of special steels and alloys, permanent magnets, cutting tools, batteries, catalysts, pigments for enamels and glass, and dryers for oil, paints, and varnishes. In biological systems cobalt acts as an active nutrient and an active center of coenzymes called cobalamines. The most important representative of this class of compounds is vitamin B-12: a key substance, which is normally involved in the metabolism of every cell of the human body, especially affecting DNA synthesis and neurologic function [1]. Cobalt deficiency (and hence vitamin B-12 deficiency) can lead to a wide spectrum of hematologic, neuropsychiatric, and cardiovascular disorders. On the other hand, cobalt can be toxic when consumed in excessive quantities [2, 3]. That is why its content in various samples is monitored, despite the fact that the existing methods for cobalt determination are not enough sensitive or cost effective [4–7]. 4-(2-Pyridylazo)resorcinol (PAR) has been proved to be one of the most important reagents for cobalt separation, preconcentration and determination [6–26]. PAR forms with Co(II) intensively colored anionic chelates, or , which can readily react with bulky organic compounds [20–36] to give ternary complexes with good extraction behavior and analytical potential. In the present paper, we investigated the complex formation in a liquid-liquid extraction system containing Co(II), PAR, and Nitron (Nt). Nt (Figure 1) is a low-cost and low-toxic analytical reagent that has been commercially available for more than a century; however, some novel aspects of its chemical
Short-range action and long-range action of the electrostatic forces within atomic nuclei  [PDF]
Dragia Ivanov, Kiril Kolikov
Natural Science (NS) , 2013, DOI: 10.4236/ns.2013.54064
We study the interaction forces in atomic nuclei based on our expressions for the electrostatic interaction between spheres of arbitrary radii and charges. We prove that at small distances the proton-neutron electrostatic attraction forces are short-range-acting and the proton-proton electrostatic repulsion forces are long-range-acting. We obtain that these forces are commensurate with the nuclear forces. The protonneutron electrostatic attraction forces and the proton-proton electrostatic repulsion forces at the same distance between nucleons differ in absolute value by about an order of magnitude. It follows that based on electromagnetic interactions the neutrons are the binding building blocks in nuclear structures.
Modelling of Enzymatic Action in Heterogeneous Phase Assay
Kiril Tenekedjiev
Bioautomation , 2007,
Abstract: Thrombolysis is based on the action of a fluid-phase enzyme (plasminogen activator) on a gel-phase bound plasminogen with subsequent generation of an active protease (plasmin), which dissolves the gel matrix (fibrin). The design of new therapeutic tools requires adequate in silico models of the process for efficient preliminary testing and characterization of the thrombolytic agents. The present study describes an approach for simulation of the heterogeneous phase enzymatic process and identification of model parameters for the enzymes.
A review of a book BASICS OF SPECIAL EDUCATION AND REHABILITATION (Goran Ajdinski, Zoran Kitkanj, Ljupcho Ajdinski)
Journal of Special Education and Rehabilitation , 2007,
Journal of Special Education and Rehabilitation , 2005,
Abstract: A good book will certainly attract attention of educators and those interested in regular life knowledge. Marija Ajdinska and Velichko Andreevski, well - known pedagogues and special educators, collected thousands of edifying sayings from all over the world and published them as a necessary work for those who think of themselves and others and of life itself. This collection of morals on 300 pages can certainly direct one on the right life path.The morals are divided in 10 chapters – for man and life, woman and love, work and success, good and evil, happiness and hope, freedom and peace, health and age, humanity and friendship, joy and trouble. For each issue there are important considerations and morals, everyone can find a guide for his/her behaviour. Here is one of the morals: “A practical person considers everything in life seriously, but not tragically.”This book of wisdoms reminds us of education and development for everyone. A man was born as a human being that could survive only with the help of other people and learning.
Journal of Special Education and Rehabilitation , 2005,
Journal of Special Education and Rehabilitation , 2004,
Abstract: This study explains the appearance of a new ethical branch and practice called Bioethics, which task is life defense and development of human appearances and functions. In compliance with Bioethics, the concept of Special needs Education and Rehabilitation as a science and activity is investigated.Special needs Education and Rehabilitation is considered as a top of contemporary human ethics. The paper exposes the basic meanings professional ethics in Special Education and Rehabilitation. Many new phenomena determine the essence of the contemporary world. The most significant among them are the development of ethical awareness about doing people good and paying attention to all aspects of life in the world. The social sensitivity for young and weak people has developed. The philanthropic spirit for necessary charity among people has appeared. Especially significant appearances of this kind are the development of special education and rehabilitation as a special science and practice to help people with developmental disabilities and the occurrence of ecology as a specific awareness about protection of life natural conditions. These special moral knowledge and activities are fundamental elements for the new type of philosophy of living called “bioethics”.
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