Konvektivno sušenje parčića ploda batata (Ipomoea batatas (L.) Lam), zavisnost od predtretmana

The dried of pieces of sweet potatoes (Ipomoea batatas (L.) Lam) was carried in experimental convective cabinet drier with loess. This vegetable was rich in beta carotene and was not sufficiently in our countries. The dried process was carried at 55oC, and weight changes were measured every 15 minutes. Were performed three pretreatments: dried with pretreatment, blanched with the 1% vitamin C and 5% NaCl and without pretreatment. Blanched was carried in water at 60oC, for 3 minutes. The moisture content of raw sweet potato was 76.40%, but in dried material value from 16.90 to 19.59%, respectively. Rehydration values were measure of the quality of the dried process. The best results were obtained to dried small pieces of sweet potato without pretreatment, than rehydration was 83.37%.Sušenje parčića ploda batata (Ipomoea batatas (L.) Lam) ili slatkog krompira vršeno je u eksperimentalnoj konvektivnoj sušari sa lesama. Ova povrtarska biljka bogata je beta karotenom, a nedovoljno se koristi u našoj zemlji. Proces sušenja odvijao se na 55oC, a merena je promena mase na svakih 15 minuta. Rađena su tri predtretmana blanširanjem: bez dodataka (predtretman I), sa dodatkom 1% vitamina C (predtretman II), sa dodatkom 5% NaCl (predtretman III) i sušenje bez predtretmana (kontrola). Blanširanje je vršeno u destilovanoj vodi temperature 60oC za 3 minuta, sa i bez dodataka. Sadržaj vlage u sirovom plodu batatu bio je 76,40%, a u osušenom materijalu kretao se od 16,90 do 19,59 %. Stepen rehidratacije korišćen je kao mera kvaliteta procesa sušenja. Najbolji rezultati dobijeni su kod sušenja parčića ploda batata bez predtretmana, čiji je stepen rehidratacije bio 83,37%

INFLUENCE OF PHYSICAL TRAINING ON CARDIORESPIRATORY ENDURANCE IN PREADOLESCENT AGE

Cardiorespiratory or aerobic endurance is the ability of the whole body to sustain physical activity for an extended period of time, involving relatively large groups of muscles. The attitudes on the possible impact of training on cardiorespiratory endurance in preadolescents are contradictory. Our study enrolled 195 boys aged 11 to 12 years. Experimental group (n=92) consisted of the children who had been involved with planned and programmed water polo training for at least two years. Control group (n=103) consisted of schoolchildren who only had had regular physical education in schools. Our investigation protocol included standardized anthropometric measurements and tests, performed respecting the appropriate protocols. Statistical analysis of the results demonstrated that there were no significant differences in age and relative values of oxygen consumption (VO2peak). Body height and mass, as well as the skinfold thickness, were significantly higher in experimental group subjects. The values of absolute VO2peak, FVC and FEV1.0 were also significantly higher in the examinees involved with water polo training. These findings stress the importance of a systematic training process even in this early period of growth and development in order for the trainees to acquire important functional advantages. We believe that a properly planned and programmed physical training can significantly contribute to the development of cardiorespiratory endurance even as early as preadolescent age

Seroprevalence of SARS-CoV-2 antibodies among primary healthcare workers in the Republic of Srpska, Bosnia & Herzegovina: A cross-sectional study

Healthcare workers (HCW) in primary healthcare centres in the Republic of Srpska, Bosnia and Herzegovina, are on the first combat line with COVID-19. This study aimed to assess the seroprevalence of SARS-CoV-2 among HCW at the primary healthcare centres and to analyse the risk exposure to COVID-19, clinical signs and vaccination status. A cross-sectional study was conducted among HCW at the selected primary healthcare centres between 19 March and 30 April 2021. Antibodies against the SARS-CoV-2 virus were detected by enzyme-linked immunosorbent assay (ELISA). A total of 1,023 HCW (mean age 45 years; 71% female) were included in the study. The anti-SARS-CoV-2 antibodies were detected in 69.5% of all participants. There was a significant difference in seropositivity among primary healthcare centres from different geographical regions. As many as 432 (42%) of all participants had confirmed COVID-19 symptoms before the study and, 84.8% of them were seropositive. This study showed that 702 primary HCW were vaccinated with any of these vaccines: Sputnik V, Sinopharm, Pfizer/Biontech. High titre of SARS-CoV-2 antibodies was found amongst those who received one (92.6%) or both (97.2%) doses of vaccines. In this study, we report high prevalence of SARS-CoV-2 antibody among HCW in primary healthcare in the Republic of Srpska, Bosnia and Herzegovina during the third pandemic wave

Adsorption Kinetics of Reactive Dyes on Ash from Town Heating Plant

In order to investigate the mechanism of adsorption of reactive dyes from the textile industry on ash from heating plant produced by brown coal combustion, some characteristic sorption constants are determined using Langergren adsorption equations for pseudo-fi rst and pseudo-second order. Combined kinetic models of pseudo-first order and pseudo-second order can provide a simple but satisfactory explanation of the adsorption process for a reactive dye. According to the characteristic diagrams and results of adsorption kinetic parameters of reactive dyes on ashes, for the applied amounts of the adsorbents and different initial dye concentrations, it can be concluded that the rate of sorption is fully functionally described by second order adsorption model. According to the results, the rate constant of pseudo-second order decreases with increasing initial dye concentration and increases with increasing amount of adsorbent – ash

Adsorption Kinetics of Reactive Dyes on Ash from Town Heating Plant

In order to investigate the mechanism of adsorption of reactive dyes from the textile industry on ash from heating plant produced by brown coal combustion, some characteristic sorption constants are determined using Langergren adsorption equations for pseudo-fi rst and pseudo-second order. Combined kinetic models of pseudo-first order and pseudo-second order can provide a simple but satisfactory explanation of the adsorption process for a reactive dye. According to the characteristic diagrams and results of adsorption kinetic parameters of reactive dyes on ashes, for the applied amounts of the adsorbents and different initial dye concentrations, it can be concluded that the rate of sorption is fully functionally described by second order adsorption model. According to the results, the rate constant of pseudo-second order decreases with increasing initial dye concentration and increases with increasing amount of adsorbent – ash

Cost effectiveness of restoring energy in execution part of pneumatic system

170-176This study presents a structure of pneumatic systems with a special emphasis on energy saving in execution by a method of restoring energy via by-pass valve. Realized average energy savings are: conventional systems, 38.8; and servo systems, 28.6%. Cost effectiveness of proposed method is also presented

Development and designing of machines and technologies for briquette and pellet manufacturing by dry and wet process

In this paper we present achieved results of the Laboratory for Combustion of the Faculty of Occupational Safety in Niš Serbia, obtained by analyzing and designing of technologies and machines for manufacturing of briquettes and pellets by dry and wet process and identification of technological parameters of briquette manufacturing from waste biomass and coals like: humidity and granule, minimal formation pressure, adhesive type and minimal participation, as well as the possibility of designing biobriquettes with physical-chemical and energy properties given in advance.