The method of power transformer neutral point grounding is very important for power distribution network operation because it strongly affect the shapes and values of overvoltages and fault currents. Many methods of grounding are used in medium voltage (MV) power distribution networks. The selection of grounding method largely depends on the characteristics of power network connected to the substation. It is also necessary to consider the advantages and disadvantages of various neutral grounding methods during selection process to find the best solution from a technical and economical point of view. The effects of grounding methods on the characteristics of single-phase short circuit fault are discussed in this paper on the example of 110/20 kV substation ′′Bugojno′′. Modeling and simulation of the considered substation, power transmission and distribution lines are implemented in EMTP-RV software.

On a sample of 147 students (78 male and 69 female), in the first year of the Faculty of Security Studies from Banja Luka, research was conducted with the aim of determining the differences between the achieved grade and the selfassessment of motor skills between male and female students, based on the results obtained by applying adequate tests for assessment and self-assessment of students motor status. Assessment of the motor abilities was performed through a battery of six tests: the maximum number of push-ups performed in 10 seconds (MSKL) - used to assess the dynamic strength of the arms and shoulder girdle, the standing long jump (MSDM) - used to assess the explosive power of the lower extremities, agility with with a club (MOKP) - used to assess the coordination of the whole body, the maximum number of trunk lifts performed in 30 seconds (MPTR) - used to assess the dynamic strength of the trunk, hand tapping (MTAR) - used to assess the frequency of arm movements, forwardroll – back roll - running (MKNT) – used to assess the motor ability of agility. For the self-assessment of motor skills, a constructed questionnaire with six answers was used: excellent (5), above average (4), average (3), below average (2), bad (1) and very bad (0). The respondents showed a good self-assessment of motor skills, where a statistically significant difference between male and female students was recorded only in the variable for self-assessment of dynamic arm and shoulder girdle strength. Male students showed better self-assessment in the variables for assessing dynamic arm and shoulder girdle strength, dynamic trunk strength, body coordination and hand movement frequency, while female students showed better self-assessment in variables for assessing explosive leg strength and agility. The authors recommendation is that the method of self-assessment of motor skills be implemented in the teaching process, when teaching the subject Special Physical Education 1, in order to improve awareness of the role and importance of the anthropological status of students and to encourage them to exercise regularly.

Sodium benzoate (SB) as an additive in various food products prevents the growth of microbes. Although SB is considered safe, many studies have reported adverse effects. The aim of this study was to investigate the effect of dandelion extract on cell damage and hematological and biochemical disorders induced by SB in male albino rats. Different doses of SB (200 and 600 mg/kg) and ethanolic dandelion root extract (D) (40 mg/kg) were used in a 2‐week treatment of rats. Rat mortality and a higher frequency of behavioral alterations such as apathy, anxiety, and aggression have been reported at a higher dose of SB. Changes in urine pH, proteinuria, nitrituria, and bilirubinemia caused by SB were regulated by adding dandelion extract. Analysis of specific serum and urine parameters, as well as microscopic analysis of hepatocytes, showed liver and kidney failure. Anemia associated with hemolytic disorder due to erythrocyte impaired the presence of acanthocytes, and decreased values of erythrocyte blood count, hemoglobin concentration, average red blood cell size, hemoglobin amount per red blood cell, and mean corpuscular hemoglobin concentration were caused by SB treatment. As a dietary supplement, dandelion extract can be useful in the prevention of SB‐induced liver and kidney injury, and also a remedy against induced anemia, neutropenia, thrombocytopenia, hyperproteinemia, hyperglycemia, and reduction of inflammatory responses.

Dried apples improve your health owing to their mineral contents. The main function of packaging dried apples is to protect the packaged product from external factors that may affect the contents' physicochemical, mechanical, and sensory changes during the storage period. The study investigates the sensory characteristics and content of hydroxymethyl-furfural and polyphenols in dried apples and health-related considerations. To gratify that aim, the mixed apple sample was calibrated (precise sorting according to the size and color of the apples), selected, washed, and cut into slices. The product is sulfurized with SO2, the procedure takes several hours, and it is immediately introduced into the dryer. The mass is dried in a dryer "Iverak" (Valjevo, Serbia) with warm air at a temperature of max 65 ° C for 15-18 hours. Packaging materials used in the study are: 1. Monomaterial, polyethylene (PE), thickness 95μ m (PE (95) μ m); 2. Combined packaging material, oriented polypropylene metallized (OPP), thickness 20 μ m (OPPmet (20) μ m); 3.Combined packaging material, oriented polypropylene (OPP) / polyethylene (PE) thickness 20 / 50μ m (OPP / PE (20/50) μ m); 4.Combined packaging material, oriented polypropylene metallized (OPPmet) / polyethylene (PE) thickness 20 / 50μ m (OPPmet / PE (20/50) μ m); 5.Combined packaging materials, polyester (PET) / oriented polypropylene metallized (OPP) met / polyethylene thickness 12/38/30 (PET/OPPmet/PE(12/38/30) μ m). The study presents the results of testing in changes of content of hydroxymethyl-furfural (HMF), polyphenols and sensory properties, dried apples packed in different combinations of packaging materials, including PE (95) μ m, OPP met (20) μ m, OPP / PE (20/50) μ m, OPP met / PE (20/50) μ m, PET / OPP met / PE (12/38/30 μ m), considering health issues. The article's findings can make a notable contribution to the knowledge of the thermal kinetics of antioxidant impacts and phenolic content over the production of apple chips.

The electrohydrodynamics’ (EHD) perfect dielectric model was added into computational fluid dynamics (CFD) software OpenFOAM in order to improve its usability for the EHD field and specifically for the mentioned model. Based on the investigated literature, it can be said that this is the most complete implementatiton of the said model. Two sets of numerical simulations with two different fluids are presented and analyzed. One set is one-dimensional. The other set is with a drop of one fluid surrounded by other fluid. Oscillations can be observed with certain expressions or calculation strategies for the electrostrictive force, and used for disregarding them. Results that are closer to analytical predictions can be obtained by using appropriate expression for the dielectric force. The electrostrictive force was implemented not only for nonpolar, but also for polar fluids, and it is shown that it might significantly influence the drop deformation. Calculated and analytically predicted drop deformations were close or comparable even up to around 0.25, what is significantly higher and different from a previous study made by other authors. Different expressions for the electric permittivity and usage of limiters for volume fractions were investigated. Conclusions from this paper can be transferred to more complicated models.

Background: There is paucity of data regarding the effects of delayed reperfusion (DR) on clinical outcomes in patients with incomplete reperfusion following mechanical thrombectomy. We hypothesized that DR has a strong association with clinical outcome in patients with incomplete reperfusion after mechanical thrombectomy (expanded Thrombolysis in Cerebral Infarction, 2a–2c). Methods: Single-institution’s stroke registry retrospective analysis of patients admitted from February 2015 to December 2020. DR was defined as the absence of any perfusion delay on ≈24-hour contrast-enhanced follow-up perfusion imaging, whereas persistent perfusion deficit denotes a perfusion delay corresponding to the catheter angiographic deficit directly after the intervention. The association of perfusion outcome (DR versus persistent perfusion deficit) with the occurrence of new infarcts and 90-day functional independence (modified Rankin Scale score 0–2) was evaluated using logistic regression analyses. Comparison of predictive accuracy was evaluated by calculating area under the curve for models with and without perfusion outcome. Results: In 566 patients (mean age 74, 49.6% female), new infarcts in the incomplete reperfusion areas were less common in DR versus persistent perfusion deficit patients (small punctiform: 17.1% versus 25%, large confluent: 7.9% versus 63.2%; P=0.001). After adjustment for confounders, DR was a strong predictor of functional independence (adjusted odds ratio, 2.37 [95% CI 1.34–4.23]). There was a significant improvement in predictive accuracy of functional independence when perfusion outcome was added to expanded Thrombolysis in Cerebral Infarction alone (area under the curve 0.57 versus 0.62, P=0.01). Conclusions: Occurrence of DR is closely associated with tissue outcome and functional independence. DR may be an independent prognostic parameter, suggesting it as a potential outcome surrogate for medical rescue therapies.