Autor: Matuszewski, S. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Investigating of the Knocking Out Properties of Moulding Sands with New Inorganic Binders Used for Castings of Non-ferrous Metal Alloys in Comparison with the Previously Used
Autorzy:: Izdebska-Szanda, I.
Angrecki, M.
Matuszewski, S.
Powiązania:: https://bibliotekanauki.pl/articles/379552.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: innovative foundry materials
innovative foundry technologies
inorganic binders
modification
knocking out properties
residual strength
innowacyjne materiały odlewnicze
innowacyjne technologie odlewnicze
środki wiążące nieorganiczne
Opis:: The article presents the results of investigations, which make a fragment of the broad-scale studies carried out as a part of the project POIG.01.01.02-00-015/09 “Advanced materials and technologies”. One of the objectives of the introduction of new inorganic binders is to provide a good knocking out properties of moulding sands, while maintaining an appropriate level of strength properties. Therefore, a logical continuation of the previous studies were carried out the tests knocking out properties of moulding sands with new inorganic binders, including making moulds, pouring them by the chosen of non-ferrous metal alloys, knoking-out, and determining the knocking out work. The results of the study were related to the research results obtained by applying the moulding sand performed by existing technology.
Źródło:: Archives of Foundry Engineering; 2012, 12, 2s; 117-120
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: A Random Number Generator Using Ring Oscillators and SHA-256 as Post-Processing
Autorzy:: Łoza, S.
Matuszewski, Ł.
Jessa, M.
Powiązania:: https://bibliotekanauki.pl/articles/963943.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: random numbers
cryptography
ring oscillators
hash functions
field programmable gate array (FPGA)
Opis:: Today, cryptographic security depends primarily on having strong keys and keeping them secret. The keys should be produced by a reliable and robust to external manipulations generators of random numbers. To hamper different attacks, the generators should be implemented in the same chip as a cryptographic system using random numbers. It forces a designer to create a random number generator purely digitally. Unfortunately, the obtained sequences are biased and do not pass many statistical tests. Therefore an output of the random number generator has to be subjected to a transformation called postprocessing. In this paper the hash function SHA-256 as postprocessing of bits produced by a combined random bit generator using jitter observed in ring oscillators (ROs) is proposed. All components – the random number generator and the SHA-256, are implemented in a single Field Programmable Gate Array (FPGA). We expect that the proposed solution, implemented in the same FPGA together with a cryptographic system, is more attack-resistant owing to many sources of randomness with significantly different nominal frequencies.
Źródło:: International Journal of Electronics and Telecommunications; 2015, 61, 2; 199-204
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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