Komparativna analiza nacionalnog obaveštajno-bezbednosnog sistema Republike Srbije i Republike Mađarske

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Oxidation behavior during prolonged service of boiler tubes made of 2.25Cr1Mo and 12Cr1Mo0.3V heat resistance steels

During service of thermal power plant (TPP) units, different components are exposed to high temperature due to technological cycle of TPP unit. Service lifetimes of these components, especially boiler heating surfaces, may be limited due to creep, fatigue or oxidation, but materials designed for use at high temperatures have been developed primarily for their creep properties and microstructural stability during long term exposures at elevated temperatures. Having in mind that oxidation in steam environment on the inner surface of boiler tubes and in flue gass on the outer surface of boler tubes could lead to a different consequences regarding service life of tubes, either directly through metal wastage or indirectly through raising local temperatures due to the lower thermal conductivity of the oxide scale, the oxidation behaviour of a different heat resistant steels become very important characteristics. In this paper are presented some data about the oxidation behavior of boiler tubes made of 2.25Cr1Mo and 12Cr1Mo0.3V steel after service of approximately 130.000 and 200.000h in two 620MVV TPP units. Characterization of oxide scales on the inner side on tubes made of two steels with different chromium content, after two different prolonged periods of service, were compared and also their influence on the service life of tubes and kinetics of oxide scale growth were analyzed

Oxidation behavior during prolonged service of boiler tubes made of 2.25Cr1Mo and 12Cr1Mo0.3V heat resistance steels

During service of thermal power plant (TPP) units, different components are exposed to high temperature due to technological cycle of TPP unit. Service lifetimes of these components, especially boiler heating surfaces, may be limited due to creep, fatigue or oxidation, but materials designed for use at high temperatures have been developed primarily for their creep properties and microstructural stability during long term exposures at elevated temperatures. Having in mind that oxidation in steam environment on the inner surface of boiler tubes and in flue gass on the outer surface of boler tubes could lead to a different consequences regarding service life of tubes, either directly through metal wastage or indirectly through raising local temperatures due to the lower thermal conductivity of the oxide scale, the oxidation behaviour of a different heat resistant steels become very important characteristics. In this paper are presented some data about the oxidation behavior of boiler tubes made of 2.25Cr1Mo and 12Cr1Mo0.3V steel after service of approximately 130.000 and 200.000h in two 620MVV TPP units. Characterization of oxide scales on the inner side on tubes made of two steels with different chromium content, after two different prolonged periods of service, were compared and also their influence on the service life of tubes and kinetics of oxide scale growth were analyzed

Oxidation behavior during prolonged service of boiler tubes made of 2.25Cr1Mo and 12Cr1Mo0.3V heat resistance steels

During service of thermal power plant (TPP) units, different components are exposed to high temperature due to technological cycle of TPP unit. Service lifetimes of these components, especially boiler heating surfaces, may be limited due to creep, fatigue or oxidation, but materials designed for use at high temperatures have been developed primarily for their creep properties and microstructural stability during long term exposures at elevated temperatures. Having in mind that oxidation in steam environment on the inner surface of boiler tubes and in flue gass on the outer surface of boler tubes could lead to a different consequences regarding service life of tubes, either directly through metal wastage or indirectly through raising local temperatures due to the lower thermal conductivity of the oxide scale, the oxidation behaviour of a different heat resistant steels become very important characteristics. In this paper are presented some data about the oxidation behavior of boiler tubes made of 2.25Cr1Mo and 12Cr1Mo0.3V steel after service of approximately 130.000 and 200.000h in two 620MVV TPP units. Characterization of oxide scales on the inner side on tubes made of two steels with different chromium content, after two different prolonged periods of service, were compared and also their influence on the service life of tubes and kinetics of oxide scale growth were analyzed

Possibility of application pulsating electromagnetic field in a safer soybean production

The application of methods in the field of biophysics, such as the pulsating electromagnetic field (PEMP) to biological organisms, many studies are performed that indicate specific changes and efficient action on various biochemical processes of cells in plants. The obtained results do not depend only on the plant species, but also on the climatic conditions, agrotechnical measures and exposure time, intensity and nature of the fields used in the research. The aim of the study was the effect of stimulation of soybean seeds with PEMP. Soybean seeds are rich in quality proteins, oils and fats. The three-year research period 2013-2015 implied different agrometeorological conditions. Soybean seeds of the Valjevka variety were used. Soybeans were grown with different amounts of organic granular poultry manure (control - no fertilization, 750 kg.ha-1 i 1300 kg.ha-1). Seed stimulation was performed before sowing with PEMP low frequency 15 Hz and exposure of 30 minutes. Seed stimulation efficiency was very pronounced because it statistically significantly (p <0.01) increased grain yield by 4.85% and protein content in grain by 3.52%

Advancements in mesenchymal stem cell treatment for Buerger's disease

Birgerova bolest (thromboangiitis obliterans) je neaterosklerotski inflamatorni proces koji uglavnom zahvata male i srednje arterije i vene u donjim i gornjim udovima. Okarakterisan je kao vrsta vaskulitisa. Nastanak, napredovanje i težina bolesti su povezani sa pušenjem. Birgerovu bolest karakterišu bol, pojava ishemičnih ulkusa, gangrena i rizik od amputacije, što značajno utiče na kvalitet života pacijenta. Trombolitička terapija, primena nesteroidnih antiinflamatornih lekova i vaskularno-hirurški rekonstruktivni zahvati su neki od terapijskih pristupa u lečenju Birgerove bolesti. Međutim, ovi načini lečenja nisu dovoljno efikasni. Još uvek najbolji efekat na poboljšanje bolesti ima prekid pušenja. U poslednje vreme, ćelijska terapija je ponudila sasvim nove mogućnosti lečenju Birgerove bolesti. Terapija mezenhimskim matičnim ćelijama (MMĆ) je prepoznata kao novi pristup u tkivnom inženjerstvu i regenerativnoj medicini, primenljiv u lečenju različitih ishemijski poremećaja, uključujući Birgerovu bolest. Prva terapija koja koristi MMĆ u lečenju Birgerove bolesti je odobrena u Indiji 2016. godine. U martu 2017. godine Evropska komisija je terapiju autolognim MMĆ iz adipoznog tkiva uvrstila u lekove "siročiće" za Birgerovu bolest. Ovaj novi terapijski pristup je neophodno validirati u narednim studijama u više kliničkih centara.Buerger's disease or thromboangiitis obliterans, is a non-atherosclerotic inflammatory process which mostly involves medium and small sized arteries and veins in lower and upper extremities. It is categorized as vasculitis. The disease is known to be closely linked to smoking. Buerger's disease is a long-term debilitating condition because of the pain, the development of ulcers and gangrene, and the risk of amputation. Drugs effective on erythrocyte flexibility, agents acting on platelets, non-steroidal anti-inflammatory drugs and vascular reconstruction are among several therapeutic methods for Buerger's disease. However, the applied therapies are insufficiently effective. Still, the base of treatment is smoking cessation. Lately, cell therapy has offered us entirely new possibilities. Mesenchymal stem cell (MSC) treatment has been proposed as a novel approach for tissue engineering and regenerative medicine for various ischemic disorders, including Buerger's disease. In 2016, the first MSC based therapy has received regulatory approval for the treatment of Buerger's disease in India. In March 2017, orphan designation was granted by the European Commission for autologous adipose tissue-derived MSC for the treatment of Buerger's disease. Novel therapeutic approach needs to be validated in the upcoming studies conducted in different clinical centers

Interaction of fertilization and soybean genotype on number of pods, weight of 1000 grains and grain yield

In the last few decades, new soybean varieties with different characteristics, grain quality and purpose have been created, contributing to its expansion and increase in the cultivation area. Thanks to good agronomic characteristics, soybean has found its place in sustainable production systems. In order to increase the yield and quality of grain in sustainable soybean growing systems, different foliar treatments with different active substances have been increasingly applied. The aim of the study was to determine the impact of the application of EM Aktiv with effective microorganisms on the number of pods per plant, weight of 1000 grains and grain yield of different soybean cultivars grown in an integrated cultivation system. The research was conducted in the period 2016-2019 in the experimental field of the Institute of Field and Vegetable Crops Novi Sad. Varieties from three maturing groups Galina (0 group), Sava (I group) and Rubin (II group) were grown. Variants of fertilization application were: T1 control, T2 EM Aktiv was applied to the soil before sowing 20 l.ha-1, and later in vegetation 6 l.ha-1 (the first foliar treatment in the phase of three to four trefoils and the second before flowering in the budding phase), T3 NPK 8:15:15 300 kg.ha-1 in basic treatment and T4 combination of T2 and T3 treatments

Uticaj efektivnih mikroorganizama na parametre biogenosti zemljišta u rizosferi različitih genotipova soje i prinosa soje

The aim of the study was to determine the effects of applying effective microorganisms (EM) on the basic microbiological parameters of soil and soybean yield biological value. The research was conducted in the period 2016-2018. Factor A are the years 2016-2018, factor B are soybean genotypes Galina, Sava, Rubin, and factor C application of EM: variant 1 was control, variant 2 was EM in soil 20 lha-1 and foliar treatment in the stage of plant development from three to four trefoils and budding stage, 5 lha-1, variant 3 was NPK fertilizer (8:15:15), 300 kgha-1, and variant 4 was a combination of variant 2 and variant 3. During full flowering, the basic parameters of soil biogenicity were determined by the total number of microorganisms (TNB) and the number of azotobacter (AZT) and grain yield at the end of the growing period. The examined factors had a statistically significant influence on the examined parameters. Soil biogenicity parameters in variant 4 EM + NPK were statistically significantly (p lt 0.01) higher than control and variant 3. Variant 2 affected a higher number of p lt 0.01 compared to control, while compared to other variants significance was p lt 0.05 (factor B). The highest number of all examined parameters was in the rhizosphere of Rubin genotype (factor C). Variant 2 with EM increased in yield of 13.29% compared to the control which was at the level (p lt 0.05) and with the application of EM + NPK variant 4 the yield was higher by 15.95% which was at the level (p lt 0.01) of significance.Cilj istraživanja bio je da se utvrdi efekat primene efektivnih mikroorganizama (EM) na osnovne mikrobiološke parametre biogenosti zemljišta i visinu prinosa zrna soje. Istraživanja su sprovedena u periodu 2016-2018. Faktor A su gpdine 2016-2018; faktor B genotip soje Galina, Sava, Rubin i faktor C primena EM: varijanta 1kontrola, varijanta 2-EM u zemljište 20 l/ha i folijarni tretmana u fazi razvoja biljaka od tri do četiri troliske i fazi butonizacije, 5 lha-1); varijanta 3-NPK đubriva (8:15:15), 300 kgha-1 i varijanta 4 - varijanta 2 + varijanta 3. U toku punog cvetanja utvrđeni su osnovni parametri biogenosti zemljišta ukupan broj mikroorganizama (TNB) i brojnost azotobaktera (AZB) i visinu prinosa zrna na kraju vegetacije. Ispitivani faktori su imali statistički značajan uticaj na ispitivane parametre. Parametri biogenosti zemljišta kod varijante 4 EM+NPK statistički značajno (p lt 0,01) bili veći od kontrole i varijante 3. Varijanta 2 uticala je naveću brojnost p lt 0,01 u odnosu na kontrolu dok u odnosu na druge varijante značajnost je bila p lt 0,05 (factor B). U rizosferi genotipa Rubin utvrđena je najveća brojnost svih ispitivanih parametara (faktor C). Varijanta 2 sa EM uticala je na povećanje prinosa od 13,29% u odnosu na kontrolu što je bilo na nivou (p lt 0,05), a sa primenom EM+NPK varijanta 4 prinos je bio veći za 15,95% što je bilo na nivou (p lt 0,01) značajnosti

Bridge deck runoff control trough drainage, treatment and irrigation system: The case study of the bridge Ostruznica over the Sava river

The paper presents main design project of the bridge Ostruznica deck drainage and runoff treatment. An integral solution of drainage and irrigation and/or discharge water into the Sava river of pre - treated runoff from the portion of highway Dobanovci – Bubanj Potok and the bridge The treated water is taken for irrigation into the groundwater as a recharge, along the series of wells for potable water within sanitary protection zone of the Belgrade Water supply system. The first flush of the criteria rainfall runoff volume is to be pre - treated using a StormwaterR barrels. Such a solution is considered as an additional water source at the aquifer by the rivers’ banks. Also, it is a measure of water cycle improvement. The project is completed by a SwermR preventing system for accidental situation, such as leakage or accidents of vehicles and potential pollution and risks of vulnerability for the potablewater wells