Simple Model of Thermal Pollution in Rivers

Water temperature is a very important parameter of water quality. In the natural conditions water temperature is determined by hydrological and meteorological factors, in particular by the heat budget of river or lake. For the few decades, however, due to the many new power and industrial developments, anthropogenic factors have greater influence on river and lake water temperatures. The temperature of water affects biological and chemical processes in aquatic environment and can play an important role in shaping ice phenomena. In this paper a simple, one-dimensional thermal model is presented. It allows to determine the average water temperature in the cross-sections of the river downstream of the heated water discharge point. The model has been developed in the Department of Water Physics at the Institute of Meteorology and Water Management, Warsaw, Poland. It can be useful for the design of water management systems in taking decisions on hydraulic structures or on location of large conventional and nuclear power plants. The work has been done within the framework of cooperation between the Polish scientific institutions and the International Institute for Applied Systems Analysis in Laxenburg, Austria

Modern methods for analysing junctions - Practical example\ud roundabout Drnovo

In a junction design we often face with the choice between a roundabout design and a\ud signalised junction design. To make the choice, one important question should be answered is\ud which design gives a higher capacity. Until new, there is few research who c1ear1y answer\ud this question. Therefore a research about the detailed comparison of capacity of these two\ud types of junction designs is needed. This paper tries to compare the capacity of roundabout\ud and signalised junction designs for junctions with four branches and are symmetric about\ud centre on a roundabout Drnovo

Jovo Bakić: Evropska krajnja desnica (1945–2018)

Jovo Bakić: Evropska krajnja desnica (1945–2018). Clio, Beograd, 2019, 699 str

Procjena dinamičke posture mladih gimnastičara: Usporedba metoda

Functional Movement Screen is an established method of assessing dynamic posture of athletes. Validity and reliability of FMS as a screening tool is debated and one of the foremost criticism is directed at its subjectivity. To the authors’ knowledge, there is no previous research using Kinovea to precisely assess FMS scores. 10 young competitive gymnasts (4 female and 6 male) were included in this study. The participants were scored by an experienced FMS assessor on site as per standard FMS protocol. Afterwards, the same participants were scored again using Kinovea to achieve more objective measurements. Wilcoxon Signed Rank Test for FMS scores versus FMS-Kinovea scores identified FMS test no. 1 (Deep Squat) as significantly different. The median score of Deep Squat assessed on site was 2 (mean value: 2.1), while that same test, scored with Kinovea, had the median score of 1 (mean value: 1.2). Paired Pitman-Morgan test for equality of variances was used to test the dispersion of scores. None were shown to be statistically significant, however, overall FMS score was near significance threshold implying that there is a difference although our power of study was too low probably due to low sample size. We detected significant difference in the scores of Deep Squat test, which is not surprising since it is the most complicated test to asses due to a large number of variables the assessor must evaluate.Funkcionalna procjena pokreta (engl. Functional Movement Screen – FMS) je često korištena metoda za procjenu dinamičke posture sportaša. Upitna je valjanost i pouzdanost FMS-a kao metode za trijažu sportaša sklonih ozljedama, a jedna od glavnih kritika povezana je s objektivnošću same procjene. Ne postoje prethodna istraživanja koja su upotrebljavala računalni program Kinovea za preciznu procjenu s pomoću metode FMS. U ovom istraživanju sudjelovalo je 10 selekcioniranih sportskih gimnastičara (četiri djevojčice i šest dječaka). S pomoću metode FMS vježbači su procijenjeni prema uobičajenom protokolu. Nakon standardne procjene, isti su sudionici ponovno procjenjivani s pomoću metode FMS, no preko računalnog programa za kinematičku analizu Kinovea. S pomoću Wilcoxonova testa rangova uspoređeni su rezultati dobiveni primjenom dviju metoda FMS-a, standardne i Kinovea. S obzirom na rezultate, kod metode FMS-Kinovea pronađena je znatna razlika u testu 1 – Duboki čučanj. Medijan testa Duboki čučanj procijenjen standardnom metodom iznosio je 2 (srednja vrijednost iznosila je 2,1). Isti test procijenjen metodom FMS-Kinovea, imao je medijan 1 (srednja vrijednost bila je 1,2). Pitman-Morganov test za homogenost varijance primijenjen je za ispitivanje disperzije rezultata. Test nije pokazao nijednu razliku u homogenosti varijanci, no u sumiranom rezultatu testova p-vrijednost bila je blizu statističke značajnosti, što implicira postojanje razlike koju studija nije mogla otkriti zbog slabe snage istraživanja uzrokovane malim uzorkom. Razlika u rezultatima testa Duboki čučanj pokazala se značajnom, što nije iznenađujuće, s obzirom na to da je procjena upravo tog testa najsloženija zbog velikog broja varijabli u dinamičkoj posturi koje procjenjivač mora uzeti u obzir

Two phase partially miscible flow and transport modeling in porous media: application to gas migration in a nuclear waste repository

We derive a compositional compressible two-phase, liquid and gas, flow model for numerical simulations of hydrogen migration in deep geological repository for radioactive waste. This model includes capillary effects and the gas high diffusivity. Moreover, it is written in variables (total hydrogen mass density and liquid pressure) chosen in order to be consistent with gas appearance or disappearance. We discuss the well possedness of this model and give some computational evidences of its adequacy to simulate gas generation in a water saturated repository