University of Sofa

James, Bulgaria

University of Sofa

James, Bulgaria
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Tafrova-Grigorova A.,University of Sofa | Kirova M.,University of Sofa | Boiadjieva E.,University of Sofa
Chemistry | Year: 2012

A survey of 30 teachers from 28 schools of different type and different Bulgarian regions is carried out. A Bulgarian version of the Constructivist Learning Environment Survey (CLES) has been used to study science teachers' views on the constructivist learning environment, and their attitudes and preferences to the ways of teaching science in class. Teachers consider the present learning environment as a constructivist one but still keeping some features of the traditional classroom. They prefer defnitely an environment committed to constructivist practices.


This article discusses data obtained from the external evaluation of the school subject "Man & Nature" for 4 th grade blind and deaf students in Bulgaria. Special attention is given to students from three schools for pupils with special needs, those in Sofa, Plovdiv and Targovishte.


Tzanova N.,University of Sofa | Raitcheva N.,University of Sofa
Chemistry | Year: 2012

Development of modern society is marked by unlimited opportunities in communication, unifcation of priorities, expectations, infuences and interactions on a global scale. Immanent part of changes is also in processes in education as an integral part of dynamic society, driving at united educational area in priorities and expectations. Presence in common educational frame supposes consensus in goals to reach identical results. This article comments the contemporary aspects of educational system and European educational area as normative base for unity as a concept. Model of professional-situational stage of personal expression and model of expert teacher in levels, aspects to regulate them normatively are shown. This is a base to deduce accent in content - standards, as basic element in model of preparation, in professional direction pedagogy in teaching biology.


Todorov N.D.,University of Sofa | Abrashev M.V.,University of Sofa | Ivanov V.G.,University of Sofa | Avdeev G.V.,Bulgarian Academy of Science | Russev S.C.,University of Sofa
Journal of Physics: Conference Series | Year: 2010

Ceramics of double perovskite RBaCo2O5+x (R La, Nd, Gd, Y and Ho) were prepared in air at diferent annealing conditions. The samples were characterized by optical microscopy, X-ray powder difraction, scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDX), and micro-Raman spectroscopy. In the case of RBaCo2O5+x (R Gd, Y and Ho) the optical anisotropy of the tetragonal-like microcrystals observed is sufcient to determine their orientation and to obtain their polarized Raman spectra from (001)- and (100)-type oriented crystal surfaces. Due to the fact that some of the impurities observed in the ceramics have Raman spectra with intensity much larger compared to that of the main phase, special attention was paid to identify their Raman spectra. The origin of the lines observed in the polarized Raman spectra of RBaCo2O5+x phase (R Gd, Y and Ho) is discussed. © 2010 IOP Publishing Ltd.

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