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Tytuł:: Wstęp do bayesowskiej metodologii współczesnej kosmologii
Introduction to the bayesian methodology of contemporary cosmology
Autorzy:: Kurek, Aleksandra
Kukier, Łukasz
Szydłowski, Marek
Tambor, Paweł
Powiązania:: https://bibliotekanauki.pl/articles/691128.pdf
Data publikacji:: 2009
Wydawca:: Copernicus Center Press
Tematy:: bayesianism
cosmology
Opis:: The Bayesian framework is used in reconstruction of modern cosmology which actually concentrates on estimation of model parameters. The authors demonstrate that observational cosmology should be treated as an effective theory of the Universe. It realizes dream of science proposed by logical empirism in some sense, i.e. science should be founded on empirical data from the very beginning, and it formulates and amplifies the hypothesis through new empirical data. They have also shown some limitations of the Bayesian approach as well as its advantages when this approach is applied to cosmology.
Źródło:: Zagadnienia Filozoficzne w Nauce; 2009, 45; 62-96
0867-8286
2451-0602
Pojawia się w:: Zagadnienia Filozoficzne w Nauce
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Możliwości zastosowania procesów adsorpcyjnych i membranowych do zatężania metanu pochodzącego z powietrza wentylacyjnego kopalń
Adsorption and membrane processes for the enrichment of methane in mine ventilation air
Autorzy:: Tańczyk, Marek
Janusz-Cygan, Aleksandra
Pawlaczyk-Kurek, Anna
Jaschik, Jolanta
Wojdyła, Artur
Sołtys, Elżbieta
Powiązania:: https://bibliotekanauki.pl/articles/27324063.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Instytut Inżynierii Chemicznej PAN
Tematy:: metan z powietrza wentylacyjnego kopalń
adsorpcja zmiennociśnieniowa
separacja membranowa
ventilation air methane (VAM)
pressure swing adsorption
membrane separation
Opis:: Przeprowadzono analizę metod adsorpcyjnych i membranowych pod kątem zatężania metanu w powietrzu wentylacyjnym kopalń (VAM). Stwierdzono, że możliwe jest zwiększenie stężenia VAM z 0,2-0,3% obj. do co najmniej 1% obj. przy wykorzystaniu obu technik separacyjnych, co powinno ułatwić jego utylizację w reaktorach rewersyjnych lub silnikach na paliwo ubogie.
Technologies for thermal utilization of ventilation air methane (VAM) require stabilization and/or increasing its concentration. This paper summarizes the results of research conducted at the IICh PAS in the area of adsorption and membrane processes for VAM enrichment. First of all adsorbents and membrane materials were selected and investigated for such processes. They were assessed in terms of CH4/N2 selectivity, as defined by Eqs 1 and 2, as well as adsorption capacity (adsorbents) and permeability (membranes). The properties of activated carbons and ZMS 5A investigated were presented in Table 1 and Fig. 1. In the case of membranes polyimide membranes, used in commercial UMS-A5 and CO-C05 UBE modules, as well as the Matrimid 5218/CMS composite membrane, were selected for membrane VAM enrichment process. The pressure swing adsorption process in two-bed (Fig. 2) and four-bed (Fig. 4) installations for VAM enrichment was also investigated. The process performance was presented in Fig. 3 and Figs 5-6, respectively. It has been found that in the case of the four-bed process with activated carbon G2X7/12 Takeda VAM can be enriched from 0.2 to over 1.2 vol.% with a recovery of at least 80%. The results of membrane VAM enrichment processes were summarized in Table 2. It was found that in the case of commercially available UBE modules UMS-A5 and CO-C05 the concentration of methane in VAM can be increased from 0.3 to 0.43 vol.% with moderate CH4 recovery (50-60%). Higher enrichment (up to 1,8 vol.% in a three-stage system) can be obtained in the case of the hybrid Matrimid 5218/CMS. For an assessment of the energy efficiency of the PSA and membrane enrichment processes two factors were defined: the unit power necessary to generate the pressure ratio pW/pN in the separation process (Eq. 3) and the unit heat output of the ventilation air (Eq. 4). These factors were presented in Fig. 7 along with unit thermal power of the enriched gas for the membrane (triangles) and adsorption (diamonds) VAM enrichment processes. It was found that regardless of the separation method and process parameters, the potential energy gain from the utilization of enriched VAM is much lower than the energy expenditure related to the implementation of the enrichment process, which is primarily due to the low unit thermal power of the ventilation air.
Źródło:: Prace Naukowe Instytutu Inżynierii Chemicznej Polskiej Akademii Nauk; 2022, 26; 17--36
1509-0760
Pojawia się w:: Prace Naukowe Instytutu Inżynierii Chemicznej Polskiej Akademii Nauk
Dostawca treści:: Biblioteka Nauki

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