Семинар-практикумът в неформалното обучение – възможност и развитие на умения и творчество през призмата на физиката

Author(s): Assen Pashov,S. Yordanova-Dyulgerova,Bonka Karaivanova-Dolchinkova,R. Draganova-Hristova / Language(s): Bulgarian Issue: 6/2018

The report presents a seminar-practicum, including theory, observation and experimental activity, applicable to teaching Physics and astronomy in Grade 7. Through separate work centers, under the leadership of lecturers and students from Sofia University “St. Kliment Ohridski” experimental tasks, such as making a spectroscope, eye model, color world, vibration and sound, have been accomplished. This ceminar-practicum as a non-formal teaching and learning gives opportunities for students to develop their creative potential, and enrich the theory and practice in Physics and Astronomy.

Професионалната учебна общност

Author(s): Stanimira Todorova Savova / Language(s): Bulgarian Issue: 6/2018

This article aims to present our work in the established educational community created in the school, the goals we have set ourselves, the activities carried out, the results obtained and the conclusions drawn. When comparing the results obtained, the test method and the questionnaire were used.

Определяне на земното ускорение: експериментална задача

Author(s): Mariana Anastassova / Language(s): Bulgarian Issue: 6/2018

Easy way for experimental determination of the Earth acceleration g is described.

Роботика за начинаещи ентусиасти

Author(s): Daniela Uzunova,Boris Velkovski,Ilko Simeonov,Vladislav Shabanski,Dimitar Kolev / Language(s): Bulgarian Issue: 6/2018

A Club of robotics was established in the High School of Mathematics in Pleven. This initiative gives good results. The activities of the students in the Club are described in brief in the present article.

Дисциплината „произход на живота и теории за еволюцията“ в професионалната подготовка на учителя по биология

Author(s): Isa Hadjiali / Language(s): Bulgarian Issue: 6/2018

The main goal of this report is to conduct a substantial analysis of some fundamental normative documents in the Secondary and university systems of education. A vector model of the professional competency of the biology teacher has been modeled on the grounds of this theoretical analysis. The concept of the discipline “The origin of life and theories of evolution” in the context of the standards of the biology teacher training at the University of Sofia is well described here. A piece of the curriculum in the form of topics and their descriptions is presented, as well.

Design and Docking Studies of His-Leu Analoguesa Potentioal Ace Inhibitor

Author(s): Atanas Chapkanov,Tatyana Dzimbova,Rumen Georgiev / Language(s): English Issue: 6/2018

Bioactive peptides are protein fragments that have a positive impact on body functions and may ultimately influence health. Angiotensin-converting enzyme plays an important role in the control of arterial blood pressure. The main action of Angiotensin II is to maintain blood pressure and fluid balance in the body. It is obtained from the precursor under catalytic action of angiotensin-converting enzyme (ACE). In order to control (inhibit) the action of the ACE different inhibitors were proposed and some of them are already in use in the clinic. In the present investigation we design and docking studies of fife new potential ACE inhibitors. Three of the proposed analogues have a potential to be ACE inhibitors, as they bind to the enzyme stronger than His-Leu. The studied peptides may form as a basis for the design of new compounds and will be synthesized and biologically tested.

X-Ray Diffraction Study of M2Zn(TeО3 )2 (M - Na, K) Тelluride

Author(s): Mitko Stoev,Kenzhebek T. Rustembekov,Aitolkyn A. Toibek / Language(s): Bulgarian Issue: 6/2018

The binary zinc telluride with the s-elements were synthesized by solid-phase method from the tellurium (IV) oxides, zinc and sodium (potassium) carbonates. The types of symmetry, unit cell parameters, X-ray and pycnometric densities of the synthesized compounds were determined by X-ray analysis.

Electrochemical Impedance Study of BSCCO (2212) Cuprate Ceramic Additive to the Zinc Electrode in Ni-Zn Batteries

Author(s): Angelina Stoyanova-Ivanova,A. Vasev,P. Lilov,G. Ivanova,Yordan Marinov,A. Stoyanova,V. Mikli / Language(s): English Issue: 6/2018

Conductive cuprate BSCCO (2212) ceramics, exhibiting superconductivity a low temperatures (80 – 100К) can find other applications as well, such as an additive in the zinc electrode of nickel-zinc batteries. Ni-Zn cells are a potential cheaper alternative to replace toxic nickel-cadmium batteries. The positive effect of cuprate ceramic additives has been previously demonstrated. The study, presented here is focused on the electrochemical characterization of Bi2Sr2CaCu2Ox (BSCCO 2212) nanocomposite conductive ceramics as an additive to the zinc electrode at 25oC and 50oC in an alkaline electrolyte containing KOH and Na3PO4. Three coin type electrodes (15mm in diameter) were investigated by Electrochemical Impedance Spectroscopy measurements by a Bio-logic SP-200 potentiostat in a wide frequency range (106 - 0.1 Hz). The tests were performed in a three-electrode electrochemical cell with different negative electrodes – one with “classic” conductive carbon additive, another with BSCCO 2212 additive, and the third without any additives (only ZnO). The obtained impedance spectra are compared and equivalent circuit models are proposed.

Calibration of GC/MS Method for Determination of Phthalates

Author(s): Dancho Danalev,I. Givechev,N. Dineva,D. Tanev / Language(s): English Issue: 6/2018

The calibration of method for determination of phthalates by means of GC/MS was done. The obtained working range for different phthalates is as following: DBP 58.8 – 1175,3 ppb; BBP 75,2 – 1504,6 ppb; DEHP 72,7 – 1454,2 ppb; DOP 59,1 – 1182,2 ppb; DINP 484,5 – 9690,3 ppb; DIDP 573,9 – 11477,0 ppb. Dicyclohexylphtalate (DICHP) was selected as an internal standard. Hexane is used as a solvent for preparation of standard solutions of phthalates.

Sonochemical Synthesis of 4-Aminoantipyrine Schiff Bases A Nd Evaluation of Their Antimicrobial, Anti-Tyrosinase and DPPH Scavenging Activities

Author(s): Maya G. Chochkiva,Boyka Stoykova,Iva Romanova,Petranka Petrova,Iva Tsvetkova,Hristo Najdenski,Lubomira Nikolaeva- Glomb,Nadya Nikolova,Galya Ivanova,Atanas Chapkanov,Tsenka Milkova,Martin Štícha,Ivan Nemec / Language(s): English Issue: 6/2018

A series of 4-(substituted benzylidene-amino)-2,3-dimethyl-1-phenyl-3-pyrazoline-5-ones (3a-l) was obtained using sonochemical assisted reaction. The synthesized Schiff bases were evaluated for their antiviral, antibacterial, anticandida, DPPH scavenging and anti-tyrosinase activities in vitro. The antimicrobial screening results revealed that amongst the tested imines, compound 3l appeared to be а promising one (with a minimal inhibitory concentration 47 ug/ml). The most potent DPPH scavengers were azometines 3a and 3g. No significant inhibition on the monophenolase activity in vitro of mushroom tyrosinase was observed.

Electrosynthesis of Cadmium Selenide Nanoparticles with Simultaneous Extraction into P-Xylene

Author(s): S. S. Fomanyuk,V. O. Smilyk,G. Y. Kolbasov,I. A. Rusetskyi,T. A. Mirnaya / Language(s): English Issue: 6/2018

Colloidal solutions of ~2 nm CdSe nanoparticles have been obtained by electrosynthesis with simultaneous extraction into p-xylene. The effect of electrolyte composition on the structure of electrodeposited CdSe nanoparticles has been established, their absorption and photoluminescence spectra have been analyzed. Exciton absorption of light by synthesized CdSe nanoparticles splits into three bands, which is characteristically for the small CdSe nanoparticles. Photoluminescence excited at wavelengths corresponding to curve bending decreases in intensity within the 350 -550 nm region with a maximum of 430 nm. This fact indicates on the formation of small (~ 2 nm) of CdSe nanoparticles in the process of electrosynthesis as well. Studies have shown that by the proposed method of electrochemical synthesis it is possible to obtain nanoparticles that are promising for the creation of optical liquid–crystalline composites.

Synthesis and Characterization of Novel Heterocycles with Anticipated Antimicrobial Activities from Pyranopyrazole Derivative

Author(s): E. A. El-Ziaty,H.M.F. Madkour,O.E.A. Mostafa,E.A. El-Bordany,M. Nabil / Language(s): English Issue: 6/2018

The previously reported 6-amino-4-(4-chlorophenyl)-3-methyl-1,4-dihydropyrano [2, 3-c] pyrazole-5-carbonitrile 1 was prepared and utilized as a precursor for novel heterocycles such as Benzoxazinone 4, Pyrazolopyranopyrimidines 8, 9, 12, 13 and 20 tetrazolopyrimidine 15 and triazolopyrimidine 16 with anticipated antimicrobial activity. The structural features of these novel heterocycles were characterized and confirmed by their spectral analysis as well as elemental analyses.

Семинар „Езикът на геополитиката в епохата на постистината“

Author(s): Daniela Koch-Kozhuharova / Language(s): Bulgarian Issue: 6/2018

Арабският свят и ислямът в културно-историческа перспектива. Изследвания в чест на проф. д.и.н. Йордан Пеев. Състав., [предг.] Павел Павлович, Симеон Евстатиев. София, Изток-Запад, 2017. 255 с.

Author(s): Nadya Filipova / Language(s): Bulgarian Issue: 2/2018

Book Review

Нов документален сборник за периода на „чистия сталинизъм“ в България

Author(s): Vladimir Migev / Language(s): Bulgarian Issue: 2/2018

Book Review

Spór o miejsce Bengalu w zdekolonizowanych Indiach na tle głównych determinantów polityki prowincji w latach 1945–1947

Author(s): Tomasz Flasiński / Language(s): Polish Issue: 3/2018

Zbrodnia z urzędu, sprawcy zza biurka. Uwagi i refleksje na marginesie lektury „Konferencja w Wannsee. Droga do «ostatecznego rozwiązania»” Petera Longericha

Author(s): Alicja Bartnicka / Language(s): Polish Issue: 3/2018

Детската усмивка казва всичко

Author(s): Reni Manova / Language(s): Bulgarian Issue: 1/2019

La mulți ani!, la 70 de ani... și încă pe-atâtea primăveri!

Author(s): Mariana Vlad / Language(s): Romanian Issue: 9/2018

Jędrzej Chumiński, Robotnicy polscy 1945–1989. „Stary” i „nowy” ośrodek przemysłowy na przykładzie Krakowa i Wrocławia

Author(s): Hubert Wilk / Language(s): Polish Issue: 76/2016