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11.
Željko Jurić Branislava Peruničić 《Electrical Engineering (Archiv fur Elektrotechnik)》2007,89(3):251-261
This paper proposes a generalization of Ziegler–Nichols' (ZN) experiment that allows the closed-loop identification of Nyquist
curve of a linear plant in three quadrants. As in the standard ZN method, no extra equipment is needed. Moreover, sustained
undamped oscillations in the plant are not required, since the identification may be accomplished with damped oscillations
only. The plant may even be unstable, assuming the used controller is able to stabilize the plant. 相似文献
12.
Long-term gas purchase contracts usually determine delivery and payment for gas on the regular hourly basis, independently of demand side consumption. In order to use fuel gas in an economically viable way, optimization of gas distribution for covering consumption must be introduced. In this paper, a mathematical model of the electric utility system which is used for optimization of gas distribution over electric generators is presented. The utility system comprises installed capacity of 1500 MW of thermal power plants, 400 MW of combined heat and power plants, 330 MW of a nuclear power plant and 1600 MW of hydro power plants. Based on known demand curve the optimization model selects plants according to the prescribed criteria. Firstly it engages run-of-river hydro plants, then the public cogeneration plants, the nuclear plant and thermal power plants. Storage hydro plants are used for covering peak load consumption. In case of shortage of installed capacity, the cross-border purchase is allowed. Usage of dual fuel equipment (gas–oil), which is available in some thermal plants, is also controlled by the optimization procedure. It is shown that by using such a model it is possible to properly plan the amount of fuel gas which will be contracted. The contracted amount can easily be distributed over generators efficiently and without losses (no breaks in delivery). The model helps in optimizing of fuel gas–oil ratio for plants with combined burners and enables planning of power plants overhauls over a year in a viable and efficient way. 相似文献
13.
Radmila V. Gari?-Grulovi? ?eljko B. Grbav?i? Zorana Lj. Arsenijevi? 《Powder Technology》2009,189(1):130-136
Wall-to-bed mass transfer in the hydraulic transport of spherical glass particles was studied. The experiments were performed by transporting spherical glass particles 1.20, 1.94 and 2.98 mm in diameter with water in a 25.4 mm I.D. tube. The mass transfer coefficients were determined by following rate of dissolution of a segment of the transport tube prepared from benzoic acid.In the runs in hydraulic transport, the Reynolds number of the tube varied between 1826 and 27597. The loading ratio (Gp/Gf) was between 0.026 and 0.474, and the fluid superficial velocity was between 0.267 · Ut and 4.904 · Ut, where Ut represents the single particle terminal velocity. For these ratios, the voidage ranged from 0.7123 to 0.9228.Also, wall-to-bed mass transfer in the single phase flow regime was studied. In the runs without particles, the Reynolds number of the tube varied between 122 and 39132. The data for the mass transfer factor (jD) in single phase flow are correlated for turbulent flow regime, using the Chilton-Colburn's type equations, jD = f(Re). Those investigations were conducted in aim to compare with results for wall-to-bed mass transfer in hydraulic transport.The data for wall-to-bed mass transfer (jD) in hydraulic transport of spherical particles were correlated by treating the flowing fluid-particle suspension as a pseudofluid, by introducing a modified suspension-wall friction coefficient (fw) and a modified Reynolds number (Rem). The data for wall-to-bed mass transfer in the hydraulic transport of particles show that an analogy between mass and momentum transfer exists. 相似文献
14.
Arsić Miodrag Arsić Dušan Flajs Željko Grbović Aleksandar Todić Aleksandar 《Russian Journal of Nondestructive Testing》2021,57(10):918-931
Russian Journal of Nondestructive Testing - Loads at vital steel structures occur during their production and assembly (residual stresses), during the execution of functional tasks in exploitation... 相似文献
15.
Pamučar Dragan Sremac Siniša Stević Željko Ćirović Goran Tomić Dejan 《Neural computing & applications》2019,31(9):5045-5068
Neural Computing and Applications - Successfully organizing the transport of hazardous materials and handling them correctly is a very important logistical task that affects both the overall flow... 相似文献
16.
17.
Nataša Z. Tomić Aleksandar D. Marinković Željko Radovanović Kata Trifković Milena Marinović-Cincović Radmila Jančić Heinemann 《Journal of Polymer Research》2018,25(4):96
Atom transfer free radical polymerization (ATRP) was employed in a synthesis of graft polymer EVA-g-PMMA with controlled length of side PMMA chains. Three steps of synthesis: partial hydrolysis of EVA, esterification with chloroacetyl chloride and ATRP grafting were performed to produce EVAOH, macroinitiator EVACl and grafted polymers G8020 (EVA/PMMA?=?80/20 wt%) and G6040 (EVA/PMMA?=?60/40 wt%). FTIR, Raman and NMR spectroscopy were used in the determination of the chemical structure and modification of EVA. Transmitted light and dark field microscopy showed higher affinity for coil formation of EVA-g-PMMA with longer PMMA side chains, i.e. G6040 compatibilizer. Morphological, thermal and adhesive properties of optical fiber adhesives of graft polymers and polymer blends poly(ethylene-co-vinyl acetate)-blend-poly(methyl methacrylate) (EVA/PMMA) compatibilized with 1 wt% of EVA-g-PMMA, were studied. Image analysis of SEM micrographs showed effective compatibilization with short grafted chains (G8020) that was indicated by lower porosity characteristics. TG/DTG analysis enabled determination of degree of hydrolysis and amount of chloro-functionalized groups. DSC analysis showed higher thermal stability of G8020 polymer. Single lap joint of adhesives/optical fibers were subjected to adhesive testing and obtained results for maximal force applied and adhesive failure suggested the visible influence of the length of graft chains on adhesion. 相似文献
18.
eljko Knez 《化学,工程师,技术》2001,73(6):691-691
19.
Lidija Škodič Julija Volmajer Valh Tina Željko Bojana Vončina Aleksandra Lobnik 《臭氧:科学与工程》2017,39(1):14-23
The decolorization and mineralization of two reactive dyes C.I. Reactive Blue 4 (RB 4) and C.I. Reactive Blue 268 (RB 268) were studied using various advanced oxidation processes (AOPs) such as H2O2/UV, H2O2/UV/Fe2+, and the H2O2/UV/Fe°. All processes were performed within a laboratory-scale photo-reactor setup. The experimental results were assessed in terms of absorbance (A) and total organic carbon (TOC) reduction. The main degradation products were identified by high resolution gas chromatography/high resolution mass spectrometry analyses. The results of our study demonstrated that the additions of moderate concentrations of H2O2 and Fe catalyst during the AOPs evidently increased the decolorization efficiencies within the first few minutes of the processing time (5–10 min) for both tested dyes, and prolonged irradiation does not necessarily significantly improve decolorization. On contrary, TOC removal rate increased with the processing time and with the addition of the catalyst from 40–50% up to 70–80% at defined experimental conditions. All the tested AOPs were very successful methods for RB 268 decolorization, having very complex structure and much higher molecular weight compared to the dye RB 4. This is important from both economic and ecological points of view. 相似文献
20.
Tanning of hides and skins to convert them into leather can have a considerable environmental impact. Wastewatertreatment technology can successfully purify leather wastewater. The first part of this research investigated the influence of Al2(SO4)3 concentration on the velocity of tannery wastewater settling. The wastewater sample was taken from two of the most polluted wastewater flows after liming and after chrome tanning. These wastewater flows were mixed together in a ratio of 1:1. The second part was carried out with the samples of wastewater mixed together with different concentrations of A12(SO4)3. The behaviour of settling was investigated after an addition of different concentrations of anionic polyelectrolytes in these samples. The pH, suspended solids mass, volume of sediment, γ(Na2S), γ(Cr2O3), chemical oxygen demand, along with turbidity in the supernatant were determined in the obtained sludge. The results demonstrate the influence of A12(SO4)3 and anionic polyelectrolyte concentrations on the parameters studied and the improvement of environmental properties. 相似文献