Zobrazeno 1 - 10
of 32
pro vyhledávání: '"Vladimír Petrus"'
Autor:
Katerina Rusevska, Lambe Barandovski, Vladimir Petruševski, Aleksandra Naumoska, Slavica Tofilovska, Marina Stojanovska
Publikováno v:
Center for Educational Policy Studies Journal, Vol 14, Iss 1, Pp 55-77 (2024)
A game-based approach is widely used to increase students’ motivation through their active participation, whereby research is interwoven with fun and competition is incorporated with cooperation. Working in teams or groups encourages students to ex
Externí odkaz:
https://doaj.org/article/74f8c8db7781498d9f2d7c54455c8c5d
Publikováno v:
Macromolecular Chemistry and Physics. 196:593-598
The stability of aromatic polyamide chains containing 1,7-dicarba-closo-dodecaborane units was investigated in dilute solution by viscometry and sedimentation analysis at 25°C. Traces of impurities in dimethylformamide bring about degradation of the
Publikováno v:
Collection of Czechoslovak Chemical Communications. 60:1950-1970
Commercial samples of ethylene-propylene-diene terpolymers (EPDM) and their fractions were characterized by osmometry (number-average molecular weight, second virial coefficient), viscometry (intrisic viscosity) and 1H NMR spectrometry (mole fraction
Publikováno v:
Collection of Czechoslovak Chemical Communications. 58:2370-2382
Aqueous solutions of poly(N-ethylmethacrylamide) have a lower critical solution temperature (LCST). Cloud point curves of five polydisperse samples (Mw . 10-6 = 0.06 to 2.04) in aqueous solutions at concentrations from 0.002 to 0.1 g/ml were obtained
Publikováno v:
Polymer. 32:1692-1695
A sedimentation and viscometric study was carried out with a neutralized copolymer of methacrylic acid and methyl methacrylate in tetrahydrofuran as a model ionomer in a low-polarity solvent. Viscosity measurements gave the usual result for ionomers
Publikováno v:
Die Makromolekulare Chemie, Rapid Communications. 11:355-358
Publikováno v:
Macedonian Journal of Chemistry and Chemical Engineering, Vol 40, Iss 1 (2021)
A way to conciliate one of the most dangerous reactions and at the same time, a way of a systematic approach towards studying the reaction of the alkali metals and acids, has been offered. Explanation of the observed phenomena considering the extent
Externí odkaz:
https://doaj.org/article/7c8cc671b0234562bd49367ab63804a2
Publikováno v:
Macedonian Journal of Chemistry and Chemical Engineering, Vol 37, Iss 1, Pp 89-98 (2018)
Earlier publications of the series "A Safe Way of Performing Dangerous Experiments" were devoted to two instances of dangerous experiments and the applied approaches appeared to be safe enough for both the instructor and the audience. Here, we presen
Externí odkaz:
https://doaj.org/article/29b0c72638ab4c1185ced6588e10a7d2
Autor:
Miloslav Bohdanecký, Vladimír Petrus
Publikováno v:
Collection of Czechoslovak Chemical Communications. 48:2914-2923
A method advanced recently is used to estimate the characteristic ratio C∞ for statistical butadiene-styrene and butadiene-acrylonitrile copolymers from the reported data of the limiting viscosity number and sedimentation coefficient. The results a
Publikováno v:
Die Makromolekulare Chemie. 187:1229-1235
The Huggins coefficient kH of solutions of statistical styrene/butadiene copolymers in cyclohexane (at 25 °C) and 2-pentanone (theta temperature 21 °C) is discussed. With an increase in branching the values of (i. e. kH at the theta temperature) in