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Search Results: 1 - 10 of 189727 matches for " Donka G. Kirova "
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Dental Anxiety in Adults in Bulgaria
Donka G. Kirova , Dimitar T. Atanasov , Christinka K. Lalabonova , Susana Janevska
Folia Medica , 2010, DOI: 10.2478/v10153-010-0047-5
Abstract: The anxiety experienced by some patients before or during dental visits poses a problem for patients and the dental practitioners alike. Some people consider them a stressful experience which manifests itself as anxiety, fear and even phobia and results in avoidance of proper dental care. The dental anxiety, dental fear and dental phobia stand out against the background of general anxiety. The aim of the present study was to investigate dental anxiety in Bulgaria by means of a self-assessment scale. Material and methods: The self-assessment Dental Anxiety Scale (DAS), developed by N Corah, was used in the form of a questionnaire containing questions about the gender, age, education and occupation of respondents. Subjects were 746 adults aged 18-82 years living in urban areas. Individual and group interviews were conducted directly with them. Results: The respondents with moderate dental anxiety were the most of all subjects (35.5%, DAS score: 9-12 points), followed by the anxiety-free subjects (34.6%, 4-8 points). The third most numerous group was the high anxiety group (18.2%, 13-14 points), followed by the subjects with severe anxiety (11.7%, 15-20 points). The mean score was 10.26±0.14. We found a statistically significant correlation between anxiety, age (P < 0.05), education (P < 0.05) and type of labour (manual or mental labour) (P < 0.01). No significant difference was found between anxiety and sex (P > 0.05). Conclusions: The percentage of people scoring high on dental anxiety (DAS 13-20) in Bulgaria (29.9%) is considerably higher than that in some European and North American countries. The present study is the first in Bulgaria on dental anxiety. Further studies are needed to reveal other factors related to dental anxiety.
Crystallization in the Three-Component Systems Rb2SO4-MSO4-H2O (M = Mg, Co, Ni, Cu, Zn) at 298 K  [PDF]
Veronika Karadjova, Donka Stoilova
Journal of Crystallization Process and Technology (JCPT) , 2013, DOI: 10.4236/jcpt.2013.34022

The crystallization in the three-component systems Rb2SO4-MSO4-H2O (M = Mg, Co, Ni, Cu, Zn) is studied by the method of isothermal decrease of supersaturation. It has been established that isostructural double compounds,

Rb2M(SO4)2·6H2O (M = Mg, Co, Ni, Cu, Zn),\"\" , crystallize from the ternary solutions within wide

concentration ranges. The infrared spectra are discussed with respect to the normal vibrations of the sulfate ions and water molecules. The unit-cell group theoretical treatment of the double salts is presented. The extent of energetic distortions of \"\" guest ions (about 2 mol%) matrix-isolated in the respective selenates, \"\" (M' = K, Rb, \"\"; M\" = Mg, Co, Ni, Cu, Zn), is commented.

Microsurgical Treatment of Optic Nerve Metastasis: Case Report and Review of the Literature  [PDF]
Sl. Kondoff, M. Milev, Chr. Tzekov, T. Spiriev, L. Laleva, G. Kirova, Chr. Kostadionova
Case Reports in Clinical Medicine (CRCM) , 2015, DOI: 10.4236/crcm.2015.411071
Abstract: Metastatic lesions to the eye and optic nerve have incidence of 12% and are observed predominantly in patients, diagnosed with breast and lung cancer. However, isolated involvement of the optic nerve by breast cancer metastasis is much rarely reported with only 13 cases reported in the literature by 2013, according to Cherkaev et al., that were often preoperatively misdiagnosed. Herewith we present a rare case of optic nerve metastasis in a previously diagnosed breast cancer patient. Review of the literature was done with analysis of the diagnostic difficulties that these cases present and the role of the neurosurgeon in the management of the patients.
Low temperature water gas shift over gold catalysts
Donka Andreeva
Gold Bulletin , 2002, DOI: 10.1007/BF03214843
Abstract: This review summarizes the results reported in the literature on the water gas shift (WGS) over goldcontaining catalysts. Attention is focused on the influence of the preparation method and the nature of the support on the gold dispersion and WGS activity. Special emphasis is paid to the enhanced reducibility of the metal oxide support in the presence of gold. Some aspects of the reaction mechanism of the WGS are discussed.
Modern Information Technologies in Chemical Education: Research, Analyses and Prospects for Chemistry Teachers Training [In Bulgarian]
M. Kirova
Bulgarian Journal of Science and Education Policy , 2012,
Abstract: The present review paper describes the present state-of-art of two areas of the contemporary science education – the use of interactive media in teaching and learning chemistry in secondary schools and the competences of chemistry teachers for application of electronic education in these schools. A review of the current literature in those topics is presented in some details. The own contributions of the author in these areas are emphasized.
New elements of the painted program in the narthex at Nerezi
Bard?ieva-Trajkovska Donka
Zograf , 2002, DOI: 10.2298/zog0329035b
Abstract: The fresco paintings in the narthex of the St. Panteleimon church in Nerezi are only partly preserved, and by their thematic character, they can be divided into 3 groups: the first group consists of fragments of the Life cycle of St. Panteleimon, the second group consists of remnants of the Deesis composition painted over the entrance to the naos. The third group consists of fragments of the scenes in the first zone on the north end of the east wall, as well as the fragment of the imperial scene, which can be linked with the donor composition which was painted in the second zone on the north end of the east wall.
Recent advances in breast cancer radiotherapy: Evolution or revolution, or how to decrease cardiac toxicity?
Youlia M Kirova
World Journal of Radiology , 2010,
Abstract: Radiation therapy has a major role in the management of breast cancers. However, there is no consensus on how to irradiate and on volume definitions, and there are strong differences in strategies according to different centers and physicians. New treatment protocols and techniques have been used with the principal purpose of decreasing lung and heart toxicity and adapting radiation treatment to patients’ anatomy. There is evidence that indicates internal mammary chain radiotherapy should be used carefully and that high quality techniques should be used for decreasing the dose delivered to the heart. This review of the literature presents the state of the art on breast cancer radiotherapy, with special focus on the indications, techniques, and potential toxicity.
Learning to Guide Preschool Children's Mathematical Understanding: A Teacher's Professional Growth
Anna Kirova,Ambika Bhargava
Early Childhood Research & Practice , 2002,
Abstract: The National Council of Teachers of Mathematics emphasizes that young children need play-based opportunities to develop and deepen their conceptual understanding of mathematics. From a social-constructivist perspective, learning is more likely to occur if adults or more-competent peers mediate children's learning experiences. Emphasizing both the developmental and the curricular perspectives, this article focuses on the role of the teacher in guiding preschool children's mathematical learning while they play with everyday materials. Professional growth in three areas was identified as critical in teachers' learning to guide young children's learning of mathematical concepts. First is the ability to recognize children's demonstrated understanding of mathematical concepts, second is the ability to use mathematical language to guide their progress from behavioral to representational understanding of mathematical concepts, and third is the ability to assess systematically children's understanding of mathematical concepts. Checklists tracing the development of three fundamental mathematical concepts one-to-one correspondence, classification, and seriation are suggested as tools for teachers to monitor preschool children's learning of mathematical concepts and plan appropriate learning experiences within children's zones of proximal development. Creating an environment that is mathematically empowering and mediating children's experiences in this environment establish the foundation for constructing, modifying, and integrating mathematical concepts in young children.
High-level Component Interfaces for Collaborative Development: A Proposal
Thomas Marlowe,Vassilka Kirova
Journal of Systemics, Cybernetics and Informatics , 2009,
Abstract: Software development has rapidly moved toward collaborative development models where multiple partners collaborate in creating and evolving software intensive systems or components of sophisticated ubiquitous socio-technical-ecosystems. In this paper we extend the concept of software interface to a flexible high-level interface as means for accommodating change and localizing, controlling and managing the exchange of knowledge and functional, behavioral, quality, project and business related information between the partners and between the developed components.
Theory of plastic flows of CDWs in application to the current conversion
S. Brazovski,N. Kirova
Physics , 1999,
Abstract: We suggest a theoretical picture for distributions of plastic deformations experienced by a sliding Charge Density Wave in the course of the conversion from the normal current at the contact to the collective one in the bulk. Several mechanisms of phase slips via creation and proliferation of dislocations are compared. The results are applied to space resolved X-ray, multi-contact and optical studies. Numerical simulations are combined with model independent relations.
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