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Przejdź do strony domowej biblioteki Pedagogiczna Biblioteka Wojewódzka im. Komisji Edukacji Narodowej w Lublinie Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaPedagogiczna Biblioteka Wojewódzka im. Komisji Edukacji Narodowej w Lublinie
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Wyświetlanie 1-10 z 194
Tytuł:
Premixed combustion of acetylene-hydrogen fuel mixtures for thermodynamic state generation in a constant volume combustion vessel
Autorzy:
Johnson, S.
Nesbitt, J.
Lee, S. -Y.
Naber, J. D.
Tematy:
combustion engine
diesel engine
combustion processes
pressure vessel
preborn
Pokaż więcej
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Powiązania:
https://bibliotekanauki.pl/articles/242374.pdf  Link otwiera się w nowym oknie
Opis:
Flammability limits and flame speeds of dilute-lean fuel mixtures of hydrogen (H2) and acetylem premixed with oxygen (02) and nitrogen (N2) were examined with a detailed kinetics model. These mixtures are used in a preburn in a constant volume combustion vessel to create elevated temperatures and pressures with gas compositions that represent the thermodynamic state in a diesel engine combustion chamber at fuel injection and auto ignition. A mixture of hydrogen and acetylene with combined atomic hydrogen to carbon ratio (HCR) of 1.85 was used to match that of typical diesel fuel and results are shown in comparison to a previously used mixture with a HCR of 1.17. The lower flammability limit (LFL) of the HCR 1.85 fuel mixture was found at an equivalence ratio of 0.235, while flame speed and adiabatic combustion temperatures were also predicted for post preburn product oxygen levels between O and 21 percent. Flame speeds were shown to decrease with a reduction in oxygen concentration, an increase in nitrogen dilution, while combustion temperatures increased over most of this range. Trends for this relation of flame speed and temperature are presented and a new premixed fuel mixture with an HCR of 1.85 is proposed.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Archaeologia Polona Vol. 53 (2015)
The Canterbury Hinterland Project: understanding dynamic rural landscapes through the semi-automated interpretation of geophysical survey results
Autorzy:
Wallace, Lacey
Johnson, Paul S.
Verdonck, Lieven
Mullen, Alex
Wydawca:
Institute of Archaeology and Ethnology Polish Academy of Sciences
Powiązania:
Schneider, A., Takla, M., Nicolay, A., Raab, A. and Raab, T. 2015. A template-matching approach combining morphometric variables for automated mapping of charcoal kiln sites, Archaeological Prospection 22: doi: 10.1002/arp.1497 (in print)
Verdonck, L., Taelman, D., Vermeulen, F. and Docter, R. 2015. The impact of spatial sampling and migration on the interpretation of complex archaeological ground-penetrating radar data, Archaeological Prospection 22: doi: 10.1002/arp.1501(in print)
Nystrom, M., Holmgren, J., Fransson, J.E.S. and Olsson, H. 2014. Detection of windthrown trees using airborne laser scanning, International Journal of Applied Earth Observation and Geoinformation 30, 21‒29
Zhao, W., Forte, E., Pipan, M. and Tian, G. 2013. Ground penetrating radar attribute analysis for archaeological prospection, Journal of Applied Geophysics 97, 107‒117
Verdonck, L., Vermeulen, F., Docter, R., Meyer, C. and Kniess, R. 2013. 2D and 3D ground-penetrating radar surveys with a modular system: data processing strategies and results from archaeological field tests, Near Surface Geophysics 11 (2), 239‒252
Archaeologia Polona
Linford, N. 2004. From hypocaust to hyperbola: ground-penetrating radar surveys over mainly Roman remains in the UK, Archaeological Prospection 11, 237‒246
Wallace, L., Johnson, P., Strutt, K. and Mullen, A. 2014. Archaeological investigations of a major building, probably Roman, and related landscape features at Bourne Park, Bishopsbourne, 2011-12, Archaeologia Cantiana 134, 187-203
Opis:
il. ; 24 cm
ill. ; 24 cm
Dostawca treści:
RCIN - Repozytorium Cyfrowe Instytutów Naukowych
Inne
Tytuł:
Femtosecond X-ray Absorption Spectroscopy οf a Light-Driven Spin-Crossover Process
Autorzy:
Milne, C.
Pham, V.
Gawelda, W.
Nahhas, A.
van der Veen, R.
Johnson, S.
Beaud, P.
Ingold, G.
Borca, C.
Grolimund, D.
Abela, R.
Chergui, M.
Bressler, Ch.
Tematy:
78.70.Dm
75.30.Wx
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Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:
https://bibliotekanauki.pl/articles/1539083.pdf  Link otwiera się w nowym oknie
Opis:
Understanding the initial steps during ultrafast molecular reactions involving large spin state changes is a vital goal in structural dynamics research. These involve knowledge of the geometric structure of the system. Ultrafast X-ray absorption spectroscopy with 50-100 picosecond time resolution establishes the geometric structure of the short-lived (τ = 0.6 ns) high spin state. Here we focus on time-resolved X-ray absorption studies with 160-200 fs temporal resolution to monitor the structural evolution in this spin-conversion process.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations on the Properties of Nanostructured Mg-Doped Sn₂S₃ Thin Films towards Photovoltaic Applications
Autorzy:
Joshua Gnanamuthu, S.
Kartharinal Punithavathy, I.
Johnson Jeyakumar, S.
Jobe Prabhakar, P.
Parasuraman, K.
Nagarethinam, V.
Usharani, K.
Balu, A.
Tematy:
61.05.cp
77.84.Bw
78.66.Jg
68.55.Ln
78.20.Ci
73.61.Jc
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:
https://bibliotekanauki.pl/articles/1029811.pdf  Link otwiera się w nowym oknie
Opis:
This paper reports the synthesis, crystal structure, surface morphology, optical and electrical properties of Mg-doped Sn₂S₃ thin films deposited by spray pyrolysis technique. All the films exhibit orthorhombic crystal structure with a (211) preferential orientation. Crystallite size calculations based on the Debye-Scherrer formula indicated that the Sn₂S₃ crystallite size increases with Mg content from 27.97 nm to 33.58 nm. Scanning electron microscopy images showed that all the films were very smooth composed of nanoneedle and nanoplate shaped grains. The band gap energy of the films exhibits a blue shift from 1.94 eV to 2.09 eV with increase in Mg concentration. Resistivity values of the undoped and Mg-doped Sn₂S₃ films were found to be in the order of 0.1 Ωcm. From the obtained results it is observed that the Sn₂S₃ film coated with 2 wt% Mg concentration exhibits better physical properties.
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 194

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