82 research outputs found
Towards modelling physical and chemical effects during wettability alteration in carbonates at pore and continuum scales
Understanding what controls the enhanced oil recovery during waterflooding
of carbonate rocks is essential as the majority of the worldβs
remaining hydrocarbon reserves are contained in carbonate rocks. To
further this understanding, in this thesis we develop a pore-scale simulator
that allows us to look at the fundamental physics of fluid flow and
reactive solute transport within the porous media. The simulator is based
on the combined finite element β finite volume method, it incorporates
efficient discretization schemes and can hence be applied to porous domains
with hundreds of pores. Our simulator includes the rule-based
method of accounting for the presence of the second immiscibly trapped
fluid phase. Provided that we know what chemical conditions initiate
enhanced oil recovery, our simulator allows us to analyse whether these
conditions occur, where they occur and how they are influenced by the
flow of the aqueous phase at the pore scale. To establish the nature of
chemical interactions between the injected brines and the carbonate rocks,
we analyze the available experimental data on the single-phase coreflooding
of carbonate rocks. We then build a continuum scale simulation that
incorporates various chemical reactions, such as ions adsorption and
mineral dissolution and precipitation. We match the output of the continuum
scale model with the experimental data to identify what chemical
interactions the ions dissolved in seawater are involved in
ΠΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ½ΡΠΉ Π°Π½Π°Π»ΠΈΠ· ΠΏΡΠΎΠ³Π½ΠΎΡΡΠΈΡΠ΅ΡΠΊΠΎΠΉ Π·Π½Π°ΡΠΈΠΌΠΎΡΡΠΈ Π°Π±Π΅ΡΡΠ°ΡΠΈΠΉ Ρ ΡΠΎΠΌΠΎΡΠΎΠΌΡ 8 Ρ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ² Ρ ΡΠ²Π΅Π°Π»ΡΠ½ΠΎΠΉ ΠΌΠ΅Π»Π°Π½ΠΎΠΌΠΎΠΉ
Introduction. Uveal melanoma ability to metastasize depends on a few prognostic factors. The genetic ones are considered to be the most significant. The role of disorders of the short arm of chromosome 8 (8p), as well as a combination of changes in 8p and the long arm of this chromosome (8q) in the development of metastatic lesions in this pathology remains insufficiently studied.The study objective β to evaluate the prognostic value of chromosome 8 abnormalities in patients with uveal melanoma.Materials and methods. We analyzed 2 retrospective groups of patients who underwent enucleation for uveal melanoma, statistically homogeneous in the main clinical parameters. Group 1 included patients without signs of metastases (n = 41) with an average follow-up period of 71 months, Group 2 included patients with detected metastases (n = 51) and an average follow-up period of 21 months Chromosome abnormalities were tested by multiplex ligation-dependent probe amplification.Results. Three- and five-year survival in patients with uveal melanoma without 8p deletion were 64 and 54 %, respectively; with 8p deletion significantly lower β 25 and 6 %, respectively. The same survival rates in patients with uveal melanoma with 8q amplification were 43 and 26 %, respectively, whereas in patients without 8q amplification they were significantly higher β 80 and 74 %, respectively. In patients with uveal melanoma harbouring both abnormalities, 3- and 5-year survival rates were 26 and 7 %, whereas isolated 8q amplification was associated with 47 and 35 % survival, respectively. These survival rates differ greatly and significantly: hazard ratio 3,26 (95 % confidence interval 1,86β5,69) and 6,89 (95 % confidence interval 2,67β17,73), respectively (Ρ <0,0001).Conclusion. The findings support comprehensive evaluation of chromosome 8 abnormalities as a substantial part of uveal melanoma prognostication. 8q amplification, 8p deletion, combination of these abnormalities and its role in uveal melanoma malignity should be further discovered. Further research in this direction is needed.ΠΠ²Π΅Π΄Π΅Π½ΠΈΠ΅. Π‘ΠΏΠΎΡΠΎΠ±Π½ΠΎΡΡΡ ΡΠ²Π΅Π°Π»ΡΠ½ΠΎΠΉ ΠΌΠ΅Π»Π°Π½ΠΎΠΌΡ ΠΊ ΠΌΠ΅ΡΠ°ΡΡΠ°Π·ΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π·Π°Π²ΠΈΡΠΈΡ ΠΎΡ ΡΠ΅Π»ΠΎΠ³ΠΎ ΡΠΏΠ΅ΠΊΡΡΠ° ΠΏΡΠΎΠ³Π½ΠΎΡΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΠ°ΠΊΡΠΎΡΠΎΠ², ΡΡΠ΅Π΄ΠΈ ΠΊΠΎΡΠΎΡΡΡ
Π³Π΅Π½Π΅ΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΈΠΌΠ΅ΡΡ ΠΎΡΠ½ΠΎΠ²ΠΎΠΏΠΎΠ»Π°Π³Π°ΡΡΠ΅Π΅ Π·Π½Π°ΡΠ΅Π½ΠΈΠ΅. Π ΠΎΠ»Ρ Π½Π°ΡΡΡΠ΅Π½ΠΈΠΉ ΠΊΠΎΡΠΎΡΠΊΠΎΠ³ΠΎ ΠΏΠ»Π΅ΡΠ° Ρ
ΡΠΎΠΌΠΎΡΠΎΠΌΡ 8 (8Ρ), Π° ΡΠ°ΠΊΠΆΠ΅ ΠΊΠΎΠΌΠ±ΠΈΠ½Π°ΡΠΈΠΈ ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΠΉ 8Ρ ΠΈ Π΄Π»ΠΈΠ½Π½ΠΎΠ³ΠΎ ΠΏΠ»Π΅ΡΠ° ΡΡΠΎΠΉ Ρ
ΡΠΎΠΌΠΎΡΠΎΠΌΡ (8q) Π² ΡΠ°Π·Π²ΠΈΡΠΈΠΈ ΠΌΠ΅ΡΠ°ΡΡΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΏΠΎΡΠ°ΠΆΠ΅Π½ΠΈΡ ΠΏΡΠΈ Π΄Π°Π½Π½ΠΎΠΉ ΠΏΠ°ΡΠΎΠ»ΠΎΠ³ΠΈΠΈ ΠΎΡΡΠ°Π΅ΡΡΡ Π½Π΅Π΄ΠΎΡΡΠ°ΡΠΎΡΠ½ΠΎ ΠΈΠ·ΡΡΠ΅Π½Π½ΠΎΠΉ.Π¦Π΅Π»Ρ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ β ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ΠΈΠ΅ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ½ΠΎΠ³ΠΎ Π°Π½Π°Π»ΠΈΠ·Π° ΠΏΡΠΎΠ³Π½ΠΎΡΡΠΈΡΠ΅ΡΠΊΠΎΠΉ Π·Π½Π°ΡΠΈΠΌΠΎΡΡΠΈ Π°Π±Π΅ΡΡΠ°ΡΠΈΠΉ Ρ
ΡΠΎΠΌΠΎΡΠΎΠΌΡ 8 Ρ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ² Ρ ΡΠ²Π΅Π°Π»ΡΠ½ΠΎΠΉ ΠΌΠ΅Π»Π°Π½ΠΎΠΌΠΎΠΉ.ΠΠ°ΡΠ΅ΡΠΈΠ°Π»Ρ ΠΈ ΠΌΠ΅ΡΠΎΠ΄Ρ. ΠΡΠ»ΠΈ ΠΏΡΠΎΠ°Π½Π°Π»ΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Ρ 2 ΡΠ΅ΡΡΠΎΡΠΏΠ΅ΠΊΡΠΈΠ²Π½ΡΠ΅ Π³ΡΡΠΏΠΏΡ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ², ΠΊΠΎΡΠΎΡΡΠΌ Π±ΡΠ»Π° ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½Π° ΡΠ½ΡΠΊΠ»Π΅Π°ΡΠΈΡ ΠΏΠΎ ΠΏΠΎΠ²ΠΎΠ΄Ρ ΡΠ²Π΅Π°Π»ΡΠ½ΠΎΠΉ ΠΌΠ΅Π»Π°Π½ΠΎΠΌΡ, ΡΡΠ°ΡΠΈΡΡΠΈΡΠ΅ΡΠΊΠΈ ΠΎΠ΄Π½ΠΎΡΠΎΠ΄Π½ΡΠ΅ ΠΏΠΎ ΠΎΡΠ½ΠΎΠ²Π½ΡΠΌ ΠΊΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠΈΠΌ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠ°ΠΌ. Π 1-Ρ Π³ΡΡΠΏΠΏΡ Π²ΠΎΡΠ»ΠΈ Π±ΠΎΠ»ΡΠ½ΡΠ΅ Π±Π΅Π· ΠΏΡΠΈΠ·Π½Π°ΠΊΠΎΠ² ΠΌΠ΅ΡΠ°ΡΡΠ°Π·ΠΎΠ² (n = 41) ΡΠΎ ΡΡΠ΅Π΄Π½ΠΈΠΌ ΡΡΠΎΠΊΠΎΠΌ Π½Π°Π±Π»ΡΠ΄Π΅Π½ΠΈΡ 71 ΠΌΠ΅Ρ, Π²ΠΎ 2-Ρ Π³ΡΡΠΏΠΏΡ β Π±ΠΎΠ»ΡΠ½ΡΠ΅ Ρ Π²ΡΡΠ²Π»Π΅Π½Π½ΡΠΌΠΈ ΠΌΠ΅ΡΠ°ΡΡΠ°Π·Π°ΠΌΠΈ (n = 51) ΠΈ ΡΡΠ΅Π΄Π½ΠΈΠΌ ΡΡΠΎΠΊΠΎΠΌ Π½Π°Π±Π»ΡΠ΄Π΅Π½ΠΈΡ 21 ΠΌΠ΅Ρ. Π°Π½Π°Π»ΠΈΠ· Ρ
ΡΠΎΠΌΠΎΡΠΎΠΌΠ½ΡΡ
Π½Π°ΡΡΡΠ΅Π½ΠΈΠΉ ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΠ»ΡΡ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ ΠΌΡΠ»ΡΡΠΈΠΏΠ»Π΅ΠΊΡΠ½ΠΎΠΉ Π°ΠΌΠΏΠ»ΠΈΡΠΈΠΊΠ°ΡΠΈΠΈ Π»ΠΈΠ³ΠΈΡΠΎΠ²Π°Π½Π½ΡΡ
Π·ΠΎΠ½Π΄ΠΎΠ².Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ. Π’ΡΠ΅Ρ
- ΠΈ 5-Π»Π΅ΡΠ½ΡΡ Π²ΡΠΆΠΈΠ²Π°Π΅ΠΌΠΎΡΡΡ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ² Ρ ΡΠ²Π΅Π°Π»ΡΠ½ΠΎΠΉ ΠΌΠ΅Π»Π°Π½ΠΎΠΌΠΎΠΉ Π±Π΅Π· Π΄Π΅Π»Π΅ΡΠΈΠΈ 8p ΡΠΎΡΡΠ°Π²ΠΈΠ»Π° 64 ΠΈ 54 %, Ρ Π΄Π΅Π»Π΅ΡΠΈΠ΅ΠΉ 8p β 25 ΠΈ 6 % ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²Π΅Π½Π½ΠΎ. Π£ Π±ΠΎΠ»ΡΠ½ΡΡ
Ρ Π°ΠΌΠΏΠ»ΠΈΡΠΈΠΊΠ°ΡΠΈΠ΅ΠΉ 8q ΡΡΠΈ ΠΏΠΎΠΊΠ°Π·Π°ΡΠ΅Π»ΠΈ Π±ΡΠ»ΠΈ ΡΠ°Π²Π½Ρ 43 ΠΈ 26 %, Ρ Π±ΠΎΠ»ΡΠ½ΡΡ
Π±Π΅Π· Π°ΠΌΠΏΠ»ΠΈΡΠΈΠΊΠ°ΡΠΈΠΈ 8q β 80 ΠΈ 74 % ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²Π΅Π½Π½ΠΎ. ΠΠ»Ρ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ² Ρ ΠΎΠ΄Π½ΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΠΉ Π°ΠΌΠΏΠ»ΠΈΡΠΈΠΊΠ°ΡΠΈΠ΅ΠΉ ΡΠ΅Π³ΠΈΠΎΠ½Π° 8q ΠΈ Π΄Π΅Π»Π΅ΡΠΈΠ΅ΠΉ ΡΠ΅Π³ΠΈΠΎΠ½Π° 8Ρ 3- ΠΈ 5-Π»Π΅ΡΠ½ΡΡ Π²ΡΠΆΠΈΠ²Π°Π΅ΠΌΠΎΡΡΡ ΡΠΎΡΡΠ°Π²ΠΈΠ»Π° 26 ΠΈ 7 %, ΡΠΎΠ³Π΄Π° ΠΊΠ°ΠΊ Π΄Π»Ρ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ² Ρ ΠΈΠ·ΠΎΠ»ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ Π°ΠΌΠΏΠ»ΠΈΡΠΈΠΊΠ°ΡΠΈΠ΅ΠΉ 8q β 47 ΠΈ 35 % ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²Π΅Π½Π½ΠΎ. Π£ΡΠΎΠ²Π΅Π½Ρ Π²ΡΠΆΠΈΠ²Π°Π΅ΠΌΠΎΡΡΠΈ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ² Ρ ΠΈΠ·ΠΎΠ»ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ Π°ΠΌΠΏΠ»ΠΈΡΠΈΠΊΠ°ΡΠΈΠ΅ΠΉ 8q ΠΈ ΠΊΠΎΠΌΠ±ΠΈΠ½Π°ΡΠΈΠ΅ΠΉ Π½Π°ΡΡΡΠ΅Π½ΠΈΠΉ (del8p + amp8q) ΡΠ°Π·Π»ΠΈΡΠ°Π΅ΡΡΡ ΡΡΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎ ΠΈ Π΄ΠΎΡΡΠΎΠ²Π΅ΡΠ½ΠΎ: ΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΠ΅ ΡΠΈΡΠΊΠΎΠ² 3,26 (95 % Π΄ΠΎΠ²Π΅ΡΠΈΡΠ΅Π»ΡΠ½ΡΠΉ ΠΈΠ½ΡΠ΅ΡΠ²Π°Π» 1,86β5,69) ΠΈ 6,89 (95 % Π΄ΠΎΠ²Π΅ΡΠΈΡΠ΅Π»ΡΠ½ΡΠΉ ΠΈΠ½ΡΠ΅ΡΠ²Π°Π» 2,67β17,73) (Ρ <0,0001).ΠΠ°ΠΊΠ»ΡΡΠ΅Π½ΠΈΠ΅. ΠΡΠ΅Π½ΠΊΠ° Π°ΠΌΠΏΠ»ΠΈΡΠΈΠΊΠ°ΡΠΈΠΈ 8q, Π΄Π΅Π»Π΅ΡΠΈΠΈ 8p ΠΈ ΠΊΠΎΠΌΠ±ΠΈΠ½Π°ΡΠΈΠΈ ΡΡΠΈΡ
Π½Π°ΡΡΡΠ΅Π½ΠΈΠΉ Π΄ΠΎΠ»ΠΆΠ½Π° ΡΡΠ°ΡΡ Π½Π΅ΠΎΡΡΠ΅ΠΌΠ»Π΅ΠΌΠΎΠΉ ΡΠ°ΡΡΡΡ ΠΏΡΠΎΠ³Π½ΠΎΠ·ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΠΈΡΠΊΠ° ΠΌΠ΅ΡΠ°ΡΡΠ°Π·ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΠ²Π΅Π°Π»ΡΠ½ΠΎΠΉ ΠΌΠ΅Π»Π°Π½ΠΎΠΌΡ. ΠΠ΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΡ Π΄Π°Π»ΡΠ½Π΅ΠΉΡΠΈΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ Π² ΡΡΠΎΠΌ Π½Π°ΠΏΡΠ°Π²Π»Π΅Π½ΠΈΠΈ
Insights into non-Fickian solute transport in carbonates
[1] We study and explain the origin of early breakthrough and long tailing plume behavior by simulating solute transport through 3βD Xβray images of six different carbonate rock samples, representing geological media with a high degree of poreβscale complexity. A Stokes solver is employed to compute the flow field, and the particles are then transported along streamlines to represent advection, while the random walk method is used to model diffusion. We compute the propagators (concentration versus displacement) for a range of Peclet numbers (Pe ) and relate it to the velocity distribution obtained directly on the images. There is a very wide distribution of velocity that quantifies the impact of pore structure on transport. In samples with a relatively narrow spread of velocities, transport is characterized by a small immobile concentration peak, representing essentially stagnant portions of the pore space, and a dominant secondary peak of mobile solute moving at approximately the average flow speed. On the other hand, in carbonates with a wider velocity distribution, there is a significant immobile peak concentration and an elongated tail of moving fluid. An increase in Pe , decreasing the relative impact of diffusion, leads to the faster formation of secondary mobile peak(s). This behavior indicates highly anomalous transport. The implications for modeling fieldβscale transport are discussed
ΠΠ ΠΠΠΠΠ‘Π«ΠΠΠ Π‘ΠΠΠΠΠΠΠ― ΠΠΠ Π‘ΠΠΠΠ’ΠΠΠΠΠΠ ΠΠΠΠΠ ΠΠ’Π ΠΠΠΠΠΠΠΠΠΠΠΠ ΠΠ£Π§ΠΠΠΠ ΠΠΠΠΠ¦ΠΠΠ‘ΠΠΠ ΠΠΠΠΠΠΠ‘Π’ΠΠΠ ΠΠ ΠΠ‘ΠΠΠΠ ΠΠΠΠ ΠΠΠΠΠΠΠΠΠΠ ΠΠΠΠ£Π§ΠΠΠΠ―
Background for development of perspective apparatus for non-invasive medkal radiation diagnostics of functional state of inner organs and tissues on the base of application of microwave sensing and visualization techniques in non-ionizing range of electromagnetic spectrum safe for human organism, practically implemented using smart antenna array, is given. Perspective medical apparatus will have previously unachievable functional technological characteristics, particularly - principal possibility of high-resolution visualization of organs and tissues without using any contrast agents and costing less in comparison with existing systems of computer, magnetic resonance and positron emission tomography on the market.ΠΠ±ΠΎΡΠ½ΠΎΠ²Π°Π½Π° Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΡ ΡΠΎΠ·Π΄Π°Π½ΠΈΡ ΠΏΠ΅ΡΡΠΏΠ΅ΠΊΡΠΈΠ²Π½ΠΎΠ³ΠΎ Π°ΠΏΠΏΠ°ΡΠ°ΡΠ½ΠΎΠ³ΠΎ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ° Π½Π΅ΠΈΠ½Π²Π°Π·ΠΈΠ²Π½ΠΎΠΉ ΠΌΠ΅Π΄ΠΈΡΠΈΠ½ΡΠΊΠΎΠΉ Π»ΡΡΠ΅Π²ΠΎΠΉ Π΄ΠΈΠ°Π³Π½ΠΎΡΡΠΈΠΊΠΈ ΡΡΠ½ΠΊΡΠΈΠΎΠ½Π°Π»ΡΠ½ΠΎΠ³ΠΎ ΡΠΎΡΡΠΎΡΠ½ΠΈΡ Π²Π½ΡΡΡΠ΅Π½Π½ΠΈΡ
ΠΎΡΠ³Π°Π½ΠΎΠ² ΠΈ ΡΠΊΠ°Π½Π΅ΠΉ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΡ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠ² ΠΌΠΈΠΊΡΠΎΠ²ΠΎΠ»Π½ΠΎΠ²ΠΎΠ³ΠΎ Π·ΠΎΠ½Π΄ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΈ Π²ΠΈΠ·ΡΠ°Π»ΠΈΠ·Π°ΡΠΈΠΈ Π² Π½Π΅ΠΈΠΎΠ½ΠΈΠ·ΠΈΡΡΡΡΠ΅ΠΉ ΠΎΠ±Π»Π°ΡΡΠΈ ΡΠ»Π΅ΠΊΡΡΠΎΠΌΠ°Π³Π½ΠΈΡΠ½ΠΎΠ³ΠΎ ΡΠΏΠ΅ΠΊΡΡΠ° Ρ Π±Π΅Π·ΠΎΠΏΠ°ΡΠ½ΠΎΠΉ Π΄ΠΎΠ·ΠΎΠΉ ΠΈΠ·Π»ΡΡΠ΅Π½ΠΈΡ Π΄Π»Ρ ΠΎΡΠ³Π°Π½ΠΈΠ·ΠΌΠ° ΡΠ΅Π»ΠΎΠ²Π΅ΠΊΠ°, ΡΠ΅Π°Π»ΠΈΠ·ΡΠ΅ΠΌΡΡ
Π½Π° ΠΏΡΠ°ΠΊΡΠΈΠΊΠ΅ Ρ ΠΏΠΎΠΌΠΎΡΡΡ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΡ Π°Π΄Π°ΠΏΡΠΈΠ²Π½ΠΎΠΉ ΡΠΈΡΡΠΎΠ²ΠΎΠΉ Π°Π½ΡΠ΅Π½Π½ΠΎΠΉ ΡΠ΅ΡΠ΅ΡΠΊΠΈ. ΠΠ΅ΡΡΠΏΠ΅ΠΊΡΠΈΠ²Π½ΡΠΉ Π΄ΠΈΠ°Π³Π½ΠΎΡΡΠΈΡΠ΅ΡΠΊΠΈΠΉ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡ Π±ΡΠ΄Π΅Ρ ΠΈΠΌΠ΅ΡΡ ΡΠ°Π½Π΅Π΅ Π½Π΅Π΄ΠΎΡΡΠΈΠΆΠΈΠΌΡΠ΅ ΡΡΠ½ΠΊΡΠΈΠΎΠ½Π°Π»ΡΠ½ΡΠ΅ ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΡΠ²ΠΎΠΉΡΡΠ²Π°, Π² ΡΠ°ΡΡΠ½ΠΎΡΡΠΈ, Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΡ Π²ΡΡΠΎΠΊΠΎΡΠ°Π·ΡΠ΅ΡΠ°ΡΡΠ΅ΠΉ Π²ΠΈΠ·ΡΠ°Π»ΠΈΠ·Π°ΡΠΈΠΈ ΠΎΡΠ³Π°Π½ΠΎΠ² ΠΈ ΡΠΊΠ°Π½Π΅ΠΉ Π±Π΅Π· ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΡ ΠΊΠΎΠ½ΡΡΠ°ΡΡΠ½ΡΡ
Π²Π΅ΡΠ΅ΡΡΠ², ΠΎΠ±Π»Π°Π΄Π°Ρ ΠΏΡΠΈ ΡΡΠΎΠΌ Π±ΠΎΠ»Π΅Π΅ Π½ΠΈΠ·ΠΊΠΎΠΉ ΡΡΠΎΠΈΠΌΠΎΡΡΡΡ ΠΏΠΎ ΡΡΠ°Π²Π½Π΅Π½ΠΈΡ Ρ ΡΡΡΠ΅ΡΡΠ²ΡΡΡΠΈΠΌΠΈ ΡΠΈΡΡΠ΅ΠΌΠ°ΠΌΠΈ ΠΊΠΎΠΌΠΏΡΡΡΠ΅ΡΠ½ΠΎΠΉ, ΠΌΠ°Π³Π½ΠΈΡΠ½ΠΎ-ΡΠ΅Π·ΠΎΠ½Π°Π½ΡΠ½ΠΎΠΉ, ΠΏΠΎΠ·ΠΈΡΡΠΎΠ½Π½ΠΎ-ΡΠΌΠΈΡΡΠΈΠΎΠ½Π½ΠΎΠΉ ΡΠΎΠΌΠΎΠ³ΡΠ°ΡΠΈΠΈ Π½Π° ΡΡΠ½ΠΊΠ΅
Decoring Behaviour of Chosen Moulding Materials with Alkali Silicate Based Inorganic Binders
This paper contains basic information about new processes for cores for cylinder heads production with alkali silicate based
inorganic binders. Inorganic binders are coming back to the foreground due to their ecologically friendly nature and new technologies
for cores production and new binder systems were developed. Basically these binder systems are modified alkali silicates and
therefore they carry some well-known unfavourable properties with their usage. To compensate these disadvantages, the binder
systems are working with additives which are most often in powder form and are added in the moulding material. This paper deals
with decoring behaviour of different moulding sands as well as the influence of chosen additives on knock-out properties in laboratory
terms. For this purpose, specific methods of specimen production are described. Developed methods are then used to compare
decoring behaviour of chosen sands and binder systems
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