Success factors, tools and controllers’ tasks in conditions of intensive digitalization

The main goal set by this paper is to identify the position of controlling and controllers in the practice of companies operating in the Republic of Serbia in the conditions of intensive digitalization. This research study is focused on understanding and the critical success factors of controlling, tools and the controller’s tasks. The research study was conducted on a sample of 35 companies, and the respondents were employed in various controlling positions. In methodological terms, the analysis of the collected data included descriptive statistics, measuring the reliability and internal consistency of the variables (Cronbach’s alpha coefficient) and conducting a nonparametric test (Mann-Whitney’s U test). The results of the research study show that controlling is understood as multidimensional, most often professional support to management; that the controlling key success factor is the controller’s expertise and competence; that the most important controlling tools are the budget, variance analysis and the short-term calculation of the results, and finally that one of the controller’s basic tasks is reporting to management. The nonparametric test enabled the identification of statistically significant differences in the respondents’ attitudes

Sphaerospora molnari (myxozoa) kod šaranske mlađi

Sferosporidioza škrga je obolenje riba izazvano parazitom Sphaerospora molnari koji napada škrge i kožu. Prvo pojavljivanje sferosporidioze škrga kod šaranskih mladunaca utvrđeno je u Mađarskoj još 1972, zatim u Češkoj i Poljskoj, dok je kod nas obolenje prisutno od sredine osamdesetih godina prošlog veka. Molnar, koji je prvi је izučavao patogeni efekat ovog uzročnika, najpre ga je identifikovao kao Sphaerospora carassi. Češki istraživači Lom et Dycova detektovali su uzročnika sferosporidioze škrga iz škržnog materijala obolelih mladunaca šarana pomoću histološke sekcije tkiva i predložili da se parazitu da ime Sphaerospora molnari. Ovo obolenje je dosta često kod mladunaca ribnjačkog šarana i amura, pri čemu intenzitet infestacije može dostići čak i do 100%. Cilj ovog rada jeste da se utvrdi prisustvo obolenja izazvanog parazitom Sphaerospora molnari i da se isprate kliničke i patohistološke promene kod infestiranih mladunaca šarana. Istraživanja su sprovedena na 18 šaranskih ribnjaka u Srbiji, od 2008. do 2012. godine, a u sklopu sistemskog monitoringa najznačajnijih protozooza šarana. Mladunci šarana pregledani su tokom čitavog vegetacionog perioda. Praćene su kliničke promene, i uzimani su uzorci za nativnu mikroskopiju koja je rađena pomoću svetlosnog mikroskopa. Od inficiranih jedinki uzimano je tkivo škrga za patohistološku analizu koja je sprovedena klasičnom metodologijom, fiksiranjem u 10% formalinu, sečenjem 5 μm velikih isečaka koji su kalupljeni u parafin i bojenjem isečaka pomoću H&E. Prisustvo S. molnari ustanovljeno je kod mladunaca šarana od 20 dana do 3 meseca starosti. Na škrgama su bili prisutni razvojni stadijumi i zrele spore što se moglo uočiti na stratifikovanom epitelu škržnih filamenata. Spore su invadirale epitel i formirale velike klastere. Akumulacija razvojnih stadijuma i zrelih spora bila je prisutna je i kod dvostrukog sloja epitelnih ćelija koje pokrivaju sekundarne lamele, i to najčešće između unutrašnjeg i spoljašnjeg omotača izazivajući tako distenziju tkiva. Zaražene lamele podležu nekrozi, što dovodi do kretanja spora prema spolja. Veličina spora iznosila je 10 x 10 μm. Klinički, obolenje se manifestovalo pojavom beličastih depozita na škrgama kao posledica agregacije parazita na njima, pri čemu paraziti mogu da zauzmu i do 80% površine slojevitog epitela, prekrivajući pločice i lukove škrga. Pritisak parazita koji se razmnožavaju je takav da vrši ćelijsku deformaciju tkiva i na kraju se uočava istančanost citoplazme ćelija šktžnog epitela u obliku mreže. Pošto spore prekrivaju najveći deo respiratornog epitela, smanjuju otpornost organizma i stvaraju uslove za razvoj drugih uzročnika obolenja (prvenstveno trematoda), što Sphaerosporu molnari svrstava u patogene parazite. Lokalizacija, veličina spora odnosno razvojnih stadijuma S. molnari, kao i kliničke i patohistološke promene zabeležene tokom ovog istraživanja odgovaraju rezultatima koje su opisali ostali istraživači koji su se bavili ovom problematikom. Pošto ne postoji ni jedno adekvatno terapeutsko sredstvo, kontrola sferopsoridioze i dalje se bazira na pridržavanju osnovnih sanitarno–profilaktičkih mera, kao što su isušivanje objekata, izmrzavanje, mehanička obrada tla i dezinfekcija krečom

Removal of rose bengal dye by hydrophobic carbon quantum dots and polyurethane nanocomposites

In the present study we report the removal of Rose Bengal dye by gamma irradiated nanocomposites composed of hydrophobic carbon quantum dots incorporated in the matrix of polyurethane (hCQD-PU). It is assumed that the removal is caused by the combination of two different mechanisms. First mechanism suggested is a photocatalytic degradation by lightinduced production of singlet oxygen and other reactive oxygen species by gamma irradiated hCQD and second mechanism is the adsorption of the remaining Rose Bengal dye from the solution, by polymer matrix. The removal efficiency of the dye reached up to 92% for 4 h of irradiation by visible lamp. We have investigated the effect of different parameters, such as the dose of gamma irradiation applied to the nanocomposite, as well as the exposure time of the sample to the blue lamp (470 nm). The proposed material has a potential in water purification systems

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

Fertility trends in Serbia during the 1990s

The 1990s represent an exceptionally complex period for the population of Serbia. In addition to the impact of long-term factors, various tumultuous events affected its demographic development, such as breaking apart of former Yugoslavia, armed conflicts in the neighboring countries, sanctions imposed by the international community, social changes (transition transformation or regression), deep economic crisis, collapse of social stratification political problems, institutional crisis, and NATO military intervention. Maladjustment to the changed system of values and norms, lower level of personal attainment, feeling of insecurity, and living under permanent stress are the main features of life at an individual psychological level. Deprivation or living at the subsistence level are the main elements of the economic cost sustained by the majority of the population. How have these changes affected an individual's decision to have children? The analysis of futility indicators points to an obvious decline in the number of births across low fertility regions of Serbia. Also, the analysis has raised the question why the decline in population fertility in the low fertility regions was not even higher, bearing in mind the experiences undergone by the countries with economy in transition as well as the depth of the crisis in society. In that sense several factors come to mind. The most important are the universality of marriage socio-psychological investigations confirmed domination of the traditional character or mentality in Serbia during the 1990s, and the government’s approach to the issue of fertility improved during this time. Besides demographic needs were carefully taken into account in all amendments to the old and formulation of the new measures in the area of social policy. Mention should be made of measures ensuring employment rights of women and their entitlement to maternity leave, maternity pay, and provision of institutionalized care for the children. On the other hand under-reporting of live births, lack of knowledge on the size and characteristics of emigration flows limited the analysis of population fertility in Kosovo and Metohia. But, registered data as well as survey results show to the perseverance of the fertility model of transitional type displaying obvious traditional elements

Pattern formation during electrhydrodynamic convection with a free surface

Bibliography: p. 76-78

Active biomonitoring of air radioactivity in urban areas

To assess the validity of the moss bag monitoring technique in the radioactivity control of ground level urban air, a study on radionuclide contents in moss was performed in the city of Belgrade, Serbia. From May 2006 to May 2007, moss (Sphagnum girgensohni, Dubna, Russia) was exposed to the aero pollution in a location in the central area of the city. The activity of K-40, Pb-210, and Cs-137 was measured on an HPGe detector (Canberra, relative efficiency 23%) by standard gamma spectrometry. The activities 245 +/- 25 Bq/kg for K-40, 315 +/- 34 Bq/kg for Pb-210, and 28 +/- 4 Bq/kg for Cs-137 are in the range of values reported for the region; the differences are due to the moss species, local climate and measuring technique. Taking into consideration the time of the exposure and appropriate calibration procedure, moss bag biomonitoring could be used as a complementary method for determination of radionuclides in urban air