Search Results

1 - 10 of 58 items :

  • Green and Sustainable Technology x
Clear All
Movement of the Suspended Flow in the Open Irrigation Channels

References ARIFJANOV, A.M. – FATKHULLAEV, A.M. 2014. Dynamics of a suspended flow in the channels. Tashkent : Fan, 2014, 180 p. ARIFJANOV, A.M. – FATKHULLOEV, A.M. 2017. The program for calculation of dynamic parameters of a turbulent weighing flow. Copyright certificate for computer No. DGU 04730. Intellectual Property Agency of the Republic of Uzbekistan. Tashkent, 2017. BELOLIPETSKY, V.M. – GENOVA, S.N. 2004. Computational algorithm for determining the dynamics of suspended sediment and bottom sediment in the river bed. In Computation

Open access
Characteristics of Laminar Flow in Pipelines of Homogenous Alum Sludge Approximated with use of the Vočadlo Model for Viscoplastic Liquids

Abstract

The study presents the manners of determination of the Darcy friction factor λ for a homogenous hydromixture of alum sludge of varied hydration and temperature for the laminar flow zone. The rheological evaluation of the hydromixture as a viscoplastic body has been conducted with use of measurements of viscosity. The curves of flow were approximated with use of the generalized Vočadlo model. The Darcy friction factor λ of the pipeline was determined with use of the non-dimensional criterion λ(Regen) and λ(Re, He).

Open access
Pollution Spread Analysis In The Malá Nitra River By Using Of 1-D Model

Abstract

The Water Framework Directive (WFD) is a key initiative aimed at improving water quality throughout the EU. The development of the computer technologies enables us to solve the ecological problems in water management practice very efficiently. The mathematical and numerical modelling allows evaluating various situations of contaminants spread in rivers (from everyday wastewater disposal through the fatal discharges of toxic substances) without immediate destructive impact on the environment. The paper deals with 1-dimensional numerical model HEC-RAS and its response on various values of dispersion coefficient. This parameter is one of the most important input data for simulation of pollution spread in streams. There were performed tracer experiments in the Malá Nitra River and results of these measurements are compared with results of numerical simulations. The values of the longitudinal dispersion coefficient were estimated from this comparison. The range of mean values of this coefficient determined on the base of numerical model application was 0.05 – 0.13 m2 s−1, for the other flow condition it was 0.07 – 2.5 m2 s−1 or 0.28 – 0.6 m2 s−1. The next task was carrying out the model sensitivity analysis, which means to evaluate input data influences, especially longitudinal dispersion coefficient, on outputs computed by 1-dimensional simulation model HEC-RAS. According to the results it can be said that the model HEC-RAS responds to longitudinal dispersion coefficient value changes adequately, suitably and proportionately. The application of the model HEC-RAS demonstrated the eligibility for simulation of pollution spread in streams, which means that it is a suitable tool allowing a reasonable support in decision making process connected to river water quality management.

Open access
Inverse Problem for Looped River Networks – Lower oder River Case Study

References [1] Altman, T., & Boulos, P.F. (1995). Solving Flow-Constrained Networks: Inverse Problem. J. Hydr. Engrg. , ASCE, 121 (5), pp. 427-431. [2] Aster, R.C., Borchers, B., & Thurber, C.H. (2005). Parameter Estimation and Inverse Problems. Elsevier Academic Press, 2005. [3] Atanov, G.A., Evseeva, E.G., & Meselhe, E.A. (1999). Estimation of Roughness profile in Trapezoidal Open Channel. J. Hydr. Engrg., ASCE , 125 (3), pp. 309-312. [4] Becker, L., & Yeh, W.W.-G. (1972

Open access
Sediment Movement Mode in rivers of Uzbekistan – Environmental Aspects

References Abu Alyants , S. X. 1981. Stable and transitional regimes in artificial channels. L .: Gidrometeoizdat, 1981, 232 p. Húska , D. - Jurík, L. - TátoŠovÁ, L. - Jakab oviČovÁ, J. 2017. Cultural landscape, Foods and remote sensing. In Journal of Ecological Engineering. 18.3 2017, p. 31. Klyukanova, I.A. 1971. Suspended sediments of the Amudarya and their irrigation importance. Moscow : Nauka, 1971, 120 p. Latipov, I. Sh. - Arifjanov, A. Tasks (Questions) of movement of mixed flow in open

Open access
Photocatalytic degradation of volatile chlorinated organic compounds with ozone addition

). Removal of air pollutants by photocatalysis with ozone in a continuous-flow reactor, Environmental Engineering Science , 27, 8, pp. 651–656. Huang, X., Yuan, J., Shi, J. & Shangguan, W. (2009). Ozone-assisted photocatalytic oxidation of gaseous acetaldehyde on TiO 2 /H-ZSM-5 catalysts, Journal of Hazardous Materials , 171, 1, pp. 827–832. Inagaki, M., Hirose, Y., Matsuaga, T., Tsumura, T. & Toyoda, M. (2003). Carbon coating of anatase-type TiO 2 through their precipitation in PVA aqueous solution, Carbon , 41, 13, pp. 2619–2624. Kachina, A. (2008

Open access
Current State and Post-Crisis Develo Pments of EU-CIS Trade: Perspective Tools to Ensure Sustainability

- Business in the EU and in the world, Slovak University of Agriculture, Nitra, Slovak Republic. Erokhin, V. - Ivolga , A. 2011. WTO: how the trade integration may effect on business, Quality of entrepreneurship environment, Nitra : SUA, 2011, p. 24-29. International trade and international cargo flows in 2011 (final report), Consulting company VLANT, 2012, access at http://vlant-consult.ru Josling, T. - Anderson, K. - Schmitz, A. - Tangerman , S. 2010. Understanding International Trade in Agricultural Products, One Hundred

Open access
Directional sensitivity of differential pressure sensors of gas velocity used in manual gravimetric measurements of dust emissions from stationary sources / Czułość kierunkowa różnicowo-ciśnieniowych czujników prędkości gazu stosowanych w manualnych pomiarach grawimetrycznych emisji zanieczyszczeń pyłowych ze źródeł stacjonarnych

) PN-EN ISO (2013). PN-EN ISO 16911-1:2013-07E Stationary source emissions - Manual and automatic determination of velocity and volume flow rate in ducts - Part 1: Manual reference method. (in Polish) PN (1994). PN-Z-04030-7:1994P Air purity protection - Tests for dust content - Measurement of concentration and mass fl ow rate of particulate matter in waste gases by gravimetric method. (in Polish) Tracz, A. (2003). Research on directional sensitivity of a zero-pressure type probe as a gas velocity sensor in the P-10ZA gravimetric dust

Open access
COPPER IN THE SEDIMENTS IN SELECTED BANSKÁ ŠTIAVNICA WATER RESERVOIRS / MEĎ V SEDIMENTOCH VO VYBRANÝCH BANSKO-ŠTIAVNICKÝCH VODNÝCH NÁDRŽIACH

metals in sediments of Moshui Lake. In: Journal of Environmental Sciences (Elsevier), vol. 20, 2008, no. 4, pp. 390-397. METHODOLOGICAL INSTRUCTION of the Ministry of Environment the Slovak republic no. 549/98-2 for risk assessment of contaminated sediment flows and water reservoirs. MISHRA, V. K. - UPADHYAY, A. R. - PANDEY, S. K. - TRIPATHI, B. D. 2008. Concentrations of heavy metals and aquatic macrophytes of Govind Ballabh Pant Sagar an anthropogenic lake affected by coal mining affluent. In: Environmental Monitoring & Assessment, vol

Open access
Modelling of Pollution Transport with Sediment on the Example of the Widawa River

variation of suspended sediment properties, IAHS 137, 409-419. [29] Wiatkowski, M. (2010). Impact of the small water reservoir Psurów on the quality and flows of the Prosna River, Archives of Environmental Protection , Vol. 36, No. 3, 83-96. [30] Wiatkowski, M., Rosik-Dulewska, Cz., & Wiatkowska, B. (2010). Charakterystyka stanu użytkowania małego zbiornika zaporowego Nowaki na Korzkwi, Rocznik Ochrona Środowiska, Tom 12 (Anual Set The Environment Protection, Volume 12, 2010). [31] Yang, T.C. (1996). Sediment transport

Open access