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Wyszukujesz frazę "dilution" wg kryterium: Temat


Tytuł:
Numerical analysis of the transport of brine in the Odra River downstream of a mines discharge
Autorzy:
Zieliński, Szymon
Kostecki, Stanisław
Stefanek, Paweł
Tematy:
water quality
mining
wastewater management
brine
dilution
numerical modelling
CFD
Pokaż więcej
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:
https://bibliotekanauki.pl/articles/2037708.pdf  Link otwiera się w nowym oknie
Opis:
The mining of underground deposits causes the inflow of water to workings and the necessity of pumping them to the surface. The mining plant of KGHM Polska Miedź S.A. extracts copper ore in plant branches with different hydrogeological conditions. The inflowing water into the workings is characterised by variable mineralisation, which depends on the location of the branch. In the south-western part of the deposit, a low-mineralised stream with a relatively high flow rate can be observed, while the outflow of highly saline waters occurs in the north-eastern branch. Despite the activities undertaken that aim at using the pumped-off mine waters industrially, it is necessary to deposit them into the Odra River. Reducing the environmental impact on the Odra River is one of KGHM’s goals, which is being implemented by stabilising its salt concentration at a safe level. The paper presents the results of a 3D simulation of brine plume propagation based on a numerical model of advection-diffusion and turbulent flow. Bathymetric data from a section of the river approximately 500 m long and point data from an Odra water quality test were used to develop and validate the model. The paper discusses the types of factors that minimise the impact of brine discharge. The developed model will be used in the future to propose solutions that accelerate the mixing of mine waters with the waters of the Odra River.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Topological phases emerging from spin-orbital physics
Autorzy:
Oleś, Andrzej
Brzezicki, Wojciech
Cuoco, Mario
Forte, Filomena
Opis:
We study the evolution of spin-orbital correlations in an inhomogeneous quantum system with an impurity replacing a doublon by a holon orbital degree of freedom. Spin-orbital entanglement is large when spin correlations are antiferromagnetic, while for a ferromagnetic host we obtain a chain with only orbital interactions. In this regime, the orbital model can be mapped on spinless fermions and we uncover topological phases with zero energy modes at the edge or at the domain between magnetically inequivalent regions.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Rozcieńczenie grzybni mikoryzowej firmy Mykoflor
Dilution of the mycorrhiza mycelium produced by Mykoflor company
Autorzy:
Kubiak, J.
Tematy:
grzybnia mikoryzowa
mikoryza
rozcieńczenie
szczepionka mikoryzowa
mycorrhiza mycelium
dilution
mycorrhiza
Pokaż więcej
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Powiązania:
https://bibliotekanauki.pl/articles/289510.pdf  Link otwiera się w nowym oknie
Opis:
Ważnym typem współżycia roślin z organizmami glebowymi jest mikoryza. W przypadku grzybów mikoryzowych następuje współdziałanie między grzybem i rośliną, polegające na aktywizacji systemów enzymatycznych i procesów fizjologicznych obu partnerów, ułatwiających zasiedlanie korzeni przez grzyba. Grzybnia nie powinna być agresywna w stosunku do rośliny, co jest uwarunkowane stopniem jej rozcieńczenia.
Mycorrhiza it is important type of symbiosis between plants and soil organisms. The cooperation between fungus and plants is connected with activity of enzymatic systems and physiological processes of the partners, which help in location of roots by fungus. The mycorrhiza mycelium shouldn't be too aggressive in relation to plants, so suitable dilution of the mycelium is necessary.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental studies on the relationship between HDOP and position error in the GPS system
Autorzy:
Specht, Mariusz
Tematy:
Global Positioning System
GPS
Horizontal Dilution of Precision
HDOP
position error
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/2052120.pdf  Link otwiera się w nowym oknie
Opis:
2D position error in the Global Positioning System GPS depends on the horizontal dilution of precision (HDOP) and User Equivalent Range Error UERE. The non-dimensional HDOP coeffcient, determining the influence of satellite distribution on the positioning accuracy, can be calculated exactly for a given moment in time. However, the UERE value is a magnitude variable in time, especially due to errors in radio propagation (ionosphere and troposphere effects) and it cannot be precisely predicted. The variability of the UERE causes the actual measurements (despite an exact theoretical mathematical correlation between the HDOP value and the position error) to indicate that position errors differ for the same HDOP value. The aim of this article is to determine the relation between the GPS position error and the HDOP value. It is possible only statistically, based on an analysis of an exceptionally large measurement sample. To this end, measurement results of a 10-day GPS measurement campaign (900,000 fixes) have been used. For HDOP values (in the range of 0.6-1.8), position errors were recorded and analysed to determine the statistical distribution of GPS position errors corresponding to various HDOP values. The experimental study and statistical analyses showed that the most common HDOP values in the GPS system are magnitudes of: 0.7 ( = 0.353) and 0.8 ( = 0.432). Only 2.77% of fixes indicated an HDOP value larger than 1. Moreover, 95% of measurements featured a geometric coeffcient of 0.973 - this is why it can be assumed that in optimal conditions (without local terrain obstacles), the GPS system is capable of providing values of HDOP ≤ 1, with a probability greater than 95% (2). Obtaining a low HDOP value, which results in a low GPS position error value, calls for providing a high mean number of satellites (12 or more) and low variability in their numer.
Dostawca treści:
Biblioteka Nauki
Artykuł

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