145\(^{TH}\) ANNIVERSARY OF THE BULGARIAN ACADEMY OF SCIENCES

SERVICE LEARNING IN SCIENCE TEACHER PREPARATION PROGRAM: CONCEPTS AND PRACTICES

Service learning is now challenging higher education in the 21st century due to head, heart, and hands are employed. The concepts of service learning influenced to science teachers preparation program in terms of outcome-based education. This paper aims to...

VAPOR PRESSURE OF SOLUTIONS

At a given temperature the vapor pressure of dilute solutions is lower the vapor pressure of a pure solvent. This conclusion follows from the analysis of the so called solution perpetuum mobile.

IMPROVEMENT OF STEM EDUCATION WITH THE INTEGRATION OF DATA-LOGGERS IN THE SHINING STAR PROJECT, 2007-2011 IN SOUTHERN INDIANA

This paper describes a regional program that involved directly four middle schools and indirectly a large number of secondary schools in southern Indiana in a partnership with Indiana University Southeast working with middle school science educators to improve...

ASTRONOMICAL EDUCATIONAL PROJECT “MY KEPLER”: A LINK BETWEEN SCIENCE AND EDUCATION

The article presents highly effective constructivist methods in the extracurricular form of education in astronomy and the results from the participation of students in an international astronomical educational project. Justified is the conduct of teaching us...

EFFECT OF STUDENTS’ BACKGROUND KNOWLEDGE OF MATHEMATICS ON SENIOR SECONDARY SCHOOL STUDENTS’ ACHIEVEMENT IN PHYSICS

The study investigated the effect of students’ background knowledge of mathematics on academic achievement in physics. The moderating effect of gender was also examined. The sample consisted of 300 senior secondary school year one science/ mathematics student...

SYNTHESIS AND CHARACTERIZATION OF MIXED LIGAND CO(II) AND NI(II) COMPLEXES WITH L- PHENYLALANINE AND HIPPURIC ACID

The mixed ligand complexes, [M(HA)(Phe).2H\(_{2}\)O].2H\(_{2}\)O, where HA and Phe are the anions of hippuric acid and phenylalnine respectively and M=Co(II) and Ni(II) ions, were synthesized and characterized by FTIR, UV-vis, elemental analysis, TGA and...

LUBRICATION PROPERTIES OF DIFFERENT PENTAERYTHRITOL-OLEIC ACID REACTION PRODUCTS

The esterification reactions between pentaerythritol and oleic acid have been followed in the presence of para toluene sulfonic acid catalyst at 4:1, 2:1, 1.5:1, and 1:1 acid –alcohol mole ratios. Considering the lubrication properties of the resulting prod...

THE ORIGINS OF SECONDARY AND TERTIARY GENERAL EDUCATION IN RUSSIA: HISTORICAL VIEWS FROM THE 21ST CENTURY

The first steps of education in gymnasiums and universities in the main East Slavonic states are described. The first town with teaching in Slavic languages was Lithuanian Vilnius. Slavic education spread step by step from Lithuania via Polotsk and Kyiv to M...

ALLELOPATHIC AND CYTOTOXIC ACTIVITY OF ORIGANUM VULGARE SSP. VULGARE GROWING WILD IN BULGARIA

<i>Origanum L.</i> (Lamiaceae) is a valuable aromatic plant. Recently aromatic plants have gained interest as potent allelopathic plants. Secondary metabolites in allelopathic plants may lead to discovery of new classes of herbicides. On the other hand, the...

CHEMOMETRY AND PROFESSOR VASSIL SIMEONOV

E-LEARNING PROJECT AT FACULTY OF CHEMISTRY AND PHARMACY, UNIVERSITY OF SOFIA

The topics of E- learning is extremely popular in the last decade since the application of this didactic approach makes it possible to realize a set of advantages most important of them being distant education and life-long education. Very often the practical...

С РАКЕТНА ГРАНАТА КЪМ МЕСЕЦА: БОРБА С ЕДНА ЛЕДЕНА ЕПОХА В ГОДИНАТА 3000 СЛЕД ХРИСТА. 5.\(^{1)}\)