Temat: compressibility factor - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Simplified calibration methodology of chromatographs used in custody transfer measurements of natural gas
Autorzy:: Oliveira, E. C.
Powiązania:: https://bibliotekanauki.pl/articles/220682.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: simplified calibration
gas chromatography
superior calorific value
compressibility factor
natural gas
Opis:: The properties, superior calorific value (SCV) and the compressibility factor (z), of 77 natural gas (NG) samples are calculated from two different calibration approaches of gas chromatography, based on ISO 6974-2. The method A uses an analytical curve with seven points that the best adjust is confirmed by Analysis of Variance (ANOVA); it is required when the composition of the natural gas varies. The method B uses a single point calibration, with an allowed tolerance between the calibration gas mixture and sample mole fraction, so it is used to analyze constant natural gas streams. From natural gas composition analyzed by both methods, exceeding the method B allowed tolerance; SCV, z and its uncertainties are calculated and compared. The results show that all samples that comply with Brazilian legislation can be analyzed by method B, because there are no metrological differences in terms of SCV and z, even though the allowed tolerance has been exceeded. This simplified methodology minimizes operator exposure, besides saving about US$ 50,000.00 per chromatograph.
Źródło:: Metrology and Measurement Systems; 2012, 19, 2; 405-416
0860-8229
Pojawia się w:: Metrology and Measurement Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Transient flow in gas networks: Traveling waves
Autorzy:: Gugat, M.
Wintergerst, D.
Powiązania:: https://bibliotekanauki.pl/articles/331492.pdf
Data publikacji:: 2018
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: traveling wave
isothermal Euler equations
compressibility factor
gas network
blow-up
optimal control
fala wędrująca
równania Eulera
współczynnik ściśliwości
sieć gazowa
sterowanie optymalne
Opis:: In the context of gas transportation, analytical solutions are helpful for the understanding of the underlying dynamics governed by a system of partial differential equations. We derive traveling wave solutions for the one-dimensional isothermal Euler equations, where an affine linear compressibility factor is used to describe the correlation between density and pressure. We show that, for this compressibility factor model, traveling wave solutions blow up in finite time. We then extend our analysis to networks under appropriate coupling conditions and derive compatibility conditions for the network nodes such that the traveling waves can travel through the nodes. Our result allows us to obtain an explicit solution for a certain optimal boundary control problem for the pipeline flow.
Źródło:: International Journal of Applied Mathematics and Computer Science; 2018, 28, 2; 341-348
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Zmiany współczynnika filtracji gytii i kredy jeziornej na skutek ich etapowej konsolidacji : metodyka szacowania
The changes of permeability coefficient in the stage consolidation process of gyttja and lacustrine chalk : the methodology of valuation
Autorzy:: Damicz, J.
Powiązania:: https://bibliotekanauki.pl/articles/2075275.pdf
Data publikacji:: 2015
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: gytia
osady jeziorne
test enometryczny
współczynnik przepuszczalności
konsolidacja
ściśliwość
wskaźnik porowatości
cechy litologiczne
litologiczny współczynnik wpływu
gyttja
lacustrine deposits
oedometer test
coefficient of permeability
consolidation
compressibility
void ratio
lithological characteristics
lithological impact factor
Opis:: Lacustrine deposits, e.g. gyttja and lcustrine chalk, in natural conditions are weak soils from the engineering point of view. These soils under loading have large and long-lasting consolidation settlement. In the last years, these soils have been more often used as a subsoil, mainly for road and hydraulic engineering embankments. To predict the settlement, we have to know the strain and filtration parameters of the subsoil. The paper presents the results of coefficient permeability tests of gyttja and lacustrine chalk, performed in oedometer tests after following loading steps. The results have allowed obtaining downward but various trends of coefficient permeability changes in the consolidation process due to a decrease of void ratio. In general, the differences of trends are related to different types of gyttja. In the case of mineral-organic high-carbonate gyttja, three different decreasing trends were obtained. For these different trends, the causal relation was determined to the lithological impact factor. The lithological impact factor in the paper is proposed as the combination of main lithological characteristics.
Źródło:: Przegląd Geologiczny; 2015, 63, 3; 155--163
0033-2151
Pojawia się w:: Przegląd Geologiczny
Dostawca treści:: Biblioteka Nauki

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