ON THE PLACEMENT OF HYDROGEN AND HELIUM IN THE PERIODIC SYSTEM: A COMMENT

STUDENTS’ SCIENTIFIC LITERACY AT THE BEGINNING OF THE 21ST CENTURY: IN SEARCH OF CONCEPTUAL UNIITY

The aim of this study is to analyze the most frequently used definitions of the term „scientific literacy“ in the specialised literature and be integrated into a holistic construction essential features which are commonly identified. The methodological basis...

USE OF COMPETENCE ONTOLOGICAL MODEL FOR MATCHING OF QUALIFICATIONS

The ontological representation of competence knowledge about various specialties (from national qualifications frameworks) for their efficient matching and retrieval for the purpose of the European and National Qualifications Frameworks transparency is repres...

COMPUTER SIMULATORS: APPLICATION FOR GRADUATES’ADAPTATION AT OIL AND GAS REFINERIES

The present paper is devoted to analysis of computer simulators efficiency in terms of graduates’ adaptation at oil and gas refineries. The experience of such modeling system implementation shows that through the use of a computer simulator based on interacti...

BOSON/FERMION JANUS PARTICLES

Thermodynamically, bosons and fermions differ by their statistics only. A general entropy functional is proposed by superposition of entropic terms, typical for different quantum gases. The statistical properties of the corresponding Janus particles are deriv...

ACTIVATION ENERGY

A number of inaccuracies and errors on such an important concept of chemistry, as the activation energy of chemical reactions, have found a place in textbooks and academic documents. This article provides the necessary clarifications for adequate considerat...

SYNTHESIS, CHARACTERIZATION AND BIOLOGICAL ACTIVITIES OF PYRAZOLYL COPPER(II) NITRATE COMPLEXES

Three pyrazolyl copper(II) complexes vz. diaqua-bis(3-ferrocenyl-1Hpyrazole)-dinitrato-copper(II) (C1) , diaqua-(3-ferrocenylpyrazolyl-1-methylene pyridine)-dinitrato-copper(II) (C2) and diaqua-bis(3-phenyl-1H-pyrazole)dinitrato-copper(II) nitrito (C3)...

SYNTHESIS OF NEW [(3-NITRO-2-OXO-2H-CHROMEN4-YLAMINO) -PHENYL] -PHENYL-TRIAZOLIDIN-4-ONES AND THEIR ANTIBACTERIAL ACTIVITY

A series of reactions that result in the synthesis of novel thiazolidynones based on 4-chloro-3-nitrobenzopyran-2-one is presented in this study. During the condensation reaction of 4-chloro-3-nitrobenzopyran-2-one <b>2</b> and benzene-1,4-diamine, 4-(4-Amino...

STABILITY OF RJ-5 FUEL

In this work, the stability of a bicyclic high-energy-density fuel, RJ-5 (C\(_{14}\)H\(_{18}\)), has been inspected. The tendency of RJ-5 jet fuel to form hydroperoxide structure under storage conditions has been examined. The negative ∆G orxn values show...

A STUDY OF BEGLIKTASH MEGALITHIC COMPLEX

The article presents the results of interdisciplinary study of megalithic complex Begliktash conducted by a group of researchers from the University of Shumen. The main conclusion is that Begliktash is a natural phenomenon with interesting stone complex morph...