Comptes rendus de l'Académie bulgare des Sciences

C O N T E N T S

MATHEMATICS

01   Radoš Bakić   On the Grace–Heawood Theorem

02   Elitza Hristova   Hilbert Series and Invariants in Exterior Algebras

03   Azeb Alghanemi, Hichem Chtioui   Prescribing Scalar Curvatures on n-dimensional Manifolds, 4 ≤ n ≤ 6

04   Mosayeb Zohrehvand   IFHP Transformations on the Tangent Bundle of a Riemannian Manifold with a Class of Pseudo-Riemannian Metrics

05   Alexander Petkov   On Some Applications of Entropy Formula for the Heat Equation on a Quaternionic Contact Manifold

PHYSICS

06   Konstantin Lovchinov, Georgi Marinov, Miroslav Petrov, Nikolay Tyutyundzhiev, Gergana Alexieva, Tsvetanka Babeva   Influence of Deposition Temperature on the Structural and Optical Properties of Electrochemically Nanostructured ZnO Films

CHEMISTRY

07   Peter Georgiev, Alexander Chanachev, Silviya Simeonova, Lyuben Mihaylov, Diana Nihtianova, Tzvetanka Ivanova, Konstantin Balashev   A New Method for Studying the Kinetics of Synthesis of Gold Nanoparticles in Hexadecylanilin Monolayer at the Air/Water Interface by Means of Atomic Force Microscopy

08   Katerina Zaharieva, Silvia Dimova, Mariya Kyulavska, Filip Ublekov, Irina Stambolova, Ljubomir Dimitrov, Vladimir Blaskov   Photocatalytic Behaviour of Zinc Oxide/Polystyrene Nanocomposite for Removal of Malachite Green Dye under UV-Light

BIOLOGY

09   Elisaveta Kirova   Effect of Nitrogen Nutrition Source on Antioxidant Defense System of Soybean Plants Subjected to Salt Stress

10   Ekaterina Krumova, Nedelina Kostadinova, Jeni Miteva-Staleva, Galina Stoyancheva, Radoslav Abrashev, Vladislava Dishlijska, Boryana Spasova, Maria Angelova   Selection of Catalase Producers among Antarctic Fungi

11   Tsvetelina Isheva, Yordan Uzunov   Diatom-based Ecological Status Assessment of Intermittent Sub-Mediterranean Rivers in Bulgaria within Two Hydrological Periods

GEOLOGY

12   Todor Nikolov, Raina Hristova   Anthropocene versus Holocene in the Light of the Principles of Stratigraphy

SPACE SCIENCES

13   Alexander Mishev, Peter I. Y. Velinov   Ionization Effect in the Region of Regener–Pfotzer Maximum due to Cosmic Rays during Halloween GLE Events in October–November 2003

ENGINEERING SCIENCES

14   Shenbagarajan Anantharajan, Shenbagalakshmi Gunasekaran, Elamparithi Pandian   MRI Brain Tumour Segmentation Based on Fish Chaining Transition Optimization Algorithm

15   Daniela Sofronova, Radostina A. Angelova   A Method for Testing of the Conductivity Decay of Threads for Embedded Wearable Electronic Devices in Smart Textiles

MEDICINE

16   Iliyan Petrov, Valentin Govedarski, Petya Kashukeeva, Filip Abedinov, Ralitza Marinova, Plamen Krastev   Shortterm Results for Revascularization of the Femoropopliteal Segment using Interwoven One-wire Stent

17   Kaloyan Pavlov, Jordan Genov, Rumyana Mitova, Borislav Vladimirov, Dobromir Sotirov, Gergana Taneva, Irina Boeva, Rumyana Hristova, Teodora Komitova, Klimentina Gerdzhikova, Plamen Getsov, Ivan Terziev, Nikola Grigorov   Microwave Ablation: Monocentric Results in Treatment of Liver Malignancy

18   Nevyana Veleva, Violeta Chernodrinska, Pavlin Kemilev, Galina Dimitrova, Ognyan Mladenov, Aleksander Oscar   Vision Threatening Retinopathy of Prematurity