Microwave assisted electrolysis of alkaline water solution

The effect of microwaves (MW) on the electrolytic process of 6M KOH water solution is investigated in the temperature range from 291 K to 337 K. At lower temperatures, microwaves facilitate electrolytic process, whereas the effect is reversed at higher temperatures.Physical chemistry 2006 : 8th international conference on fundamental and applied aspects of physical chemistry; Belgrade (Serbia); 26-29 September 200

The influence of low-frequency magnetic field regions on the Saccharomyces cerevisiae respiration and growth

The influence of four low-frequency magnetic field (MF) ranges 10–300 Hz, 10–100 Hz, 10–50 Hz and 50–100 Hz in scanning regime (all frequencies from selected range were scanned during 100 s repetitively during 24 h) on baker's yeast cells Saccharomyces cerevisiae was examined by continuous measurements of cumulative O2 consumption and cumulative CO2 production over 24 h with Micro-Oxymax® respirometer. Besides respiration activity, measurements of cell growth and glucose uptake were performed as well. Statistical analysis indicated that, among all investigated low-frequency MF ranges, range from 10 Hz to 50 Hz had the greatest influence to yeast cell respiration and cell growth. More precisely, for this region, paired two sample one-tail t-test showed statistically significant differences in cumulative O2 consumption, cumulative CO2 production and S. cerevisiae cell number. Moreover samples exposed to MF range from 10 Hz to 50 Hz showed the same behavior in all five replicates: lower cumulative O2 consumption, higher cumulative CO2 production and higher cell number compared to control sample. This could be important from the application aspect, in industry (food, feed, brewery etc.) and biotechnology, because changes in cells metabolism are not caused by chemical treatment.Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/3321

Enhanced microwave synthesis of polyaniline nanomaterials

Energy- and time-efficient enhanced microwave syntheses (EMS) of polyaniline (PANI) have been carried out. The GPC results showed that the molecular weight of the microwave-generated materials depends on the applied microwave power. FTIR spectroscopies confirmed the formation of PANI. The presence of a mixed morphology with the prevalence of nanofibers with different aspect ratios is confirmed through SEM. The conductivity of the samples (ca. 3-3.5 S cm-1) is found to be relatively independent on the microwave power levels. The fact that the molecular weight depends on the power means that this approach can be fine-tuned to optimize conditions for a specific material using different power levels

Microwave assisted synthesis of polyaniline/pullulan (pani/pull) composite

Microwave assisted synthesis of polyaniline modified by pullulan (PANI/Pull) composite wasperformed by aniline oxidation with potassium iodate. The PANI/Pull composite was characterizedusing ATR-FTIR technique. FTIR spectra confirm presence of both components in PANI/Pullcomposite. Antimicrobial evaluation of PANI/Pull material performed by using a qualitative diskdiffusion method on Candida albicans (C. albicans) culture showed very high sensitivity toPANI/Pull composite. Observed FTIR and antifungal activity represent a promising results especiallyfor potential biomedical applications of PANI/Pull composite.Poster: [https://cherry.chem.bg.ac.rs/handle/123456789/5431

Microwave assisted synthesis of polyaniline/pullulan (pani/pull) composite

Poster presented at Physical Chemistry 2021, 15th International Conference on Fundamental and Applied Aspects of Physical ChemistryAbstract: [https://cherry.chem.bg.ac.rs/handle/123456789/5430

Stochastyczny model dla określenia elementów cyklu produkcyjnego. Rozważania na podstawie serbskiego przemysłu tekstylnego

The paper presents an original method of determining the elements of the production cycle time by using the modified work sampling method applied to a textile factory. It is shown that the movement of the elements of time can be viewed as a process and in the mathematical sense can establish control limits of error of ± 3 SD. The mean time of the production cycle of the groups created by the number of pieces in the series – tpcu moving the hyperbolic function, which has the asymptote c, a function of the form tpcu = c + b/log n, where all groups of the production cycle in the mathematical sense do not act like strata but are function tpcu related to technology and deterministic factors of the production series.Artykuł przedstawia oryginalną metodę określania elementów trwania cyklu produkcyjnego przy zastosowaniu zmodyfikowanej metody podziału pracy w odniesieniu do przedsiębiorstwa produkującego tekstylia. Pokazano, że przemieszczanie elementów czasu cyklu produkcyjnego można rozpatrywać jako proces, w którym matematycznie ustawia się błąd ± 3s. Średni czas cyklu produkcyjnego poszczególnych grup określa się przez liczbę elementów uszeregowanych w serię. Poszczególne zależności systemu można opisać matematycznie