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

ПРИРОДОНАУЧНАТА ГРАМОТНОСТ НА УЧЕНИЦИТЕ В НАЧАЛОТО НА XXI ВЕК – В ТЪРСЕНЕ НА КОНЦЕПТУАЛНО ЕДИНСТВО

Цел на настоящото изследване е да се анализират най-често цитирани в специализираната литература дефиниции на понятието „природонаучна грамотност“ и да се интегрират в една холистична конструкция общосподеляни в тях съществени признаци. Методологична основа н...

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...

АКТИВИРАЩА ЕНЕРГИЯ

Редица неточности и грешки относно такова важно понятие за химията, каквото е активиращата енергия на химичните реакции, са намерили място в учебниците и учебната документация. Тази статия дава нужните пояснения за адекватно разглеждане на активиращата енер...

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...