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Grain size–wear rate relationship for titanium in liquid nitrogen environment / Aditya Jain in Acta materialia, Vol. 58 N° 7 (Avril 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 7 (Avril 2010) . - pp. 2313–2323 Titre : Grain size–wear rate relationship for titanium in liquid nitrogen environment Type de document : texte imprimé Auteurs : Aditya Jain, Auteur ; B. Basu, Auteur ; B.V. Manoj Kumar, Auteur Année de publication : 2011 Article en page(s) : pp. 2313–2323 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Wear  Grain  size  Tribolayer  Ti Résumé : This paper presents the results of sliding wear experiments conducted on high-purity titanium (Ti) against bearing-steel in liquid nitrogen (LN2; boiling point: 77 K) environment. Ti samples of three different grain sizes (9, 17 and 37 μm) were used to study the effect of hardness, derived from grain refinement as well as cryogenic test temperature, on the wear properties of Ti. In our experiments, a constant load of 10 N and sliding speeds of 0.67, 1.11 and 4.19 m s−1 were used. The coefficient of friction (COF) for this tribo-couple varied between ∼0.25 and ∼0.50. While a steady state was always achieved, a peak in the COF was always noted in case of coarse-grain (37 μm) Ti tested at a sliding speed of 4.19 m s−1. Under the investigated sliding conditions, the wear rate was found to be of the order of 10−3–10−4 mm3 N−1 m−1. The lowest wear rate was recorded in the fine-grain (9 μm) Ti at the highest sliding speed of 4.19 m s−1. The critical analysis of the worn surface topography reveals that the reduced wear rate was due to the formation of adherent and strain-hardened tribolayer. In order to show various dominant wear mechanisms of Ti, a qualitative map was developed in sliding speed–grain size space. Substructure evaluation revealed the formation of a dense array of deformation twins because of the plastic deformation, which often resulted in the subdivision of grains. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008593 [article] Grain size–wear rate relationship for titanium in liquid nitrogen environment [texte imprimé] / Aditya Jain, Auteur ; B. Basu, Auteur ; B.V. Manoj Kumar, Auteur . - 2011 . - pp. 2313–2323. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 7 (Avril 2010) . - pp. 2313–2323 Mots-clés : Wear  Grain  size  Tribolayer  Ti Résumé : This paper presents the results of sliding wear experiments conducted on high-purity titanium (Ti) against bearing-steel in liquid nitrogen (LN2; boiling point: 77 K) environment. Ti samples of three different grain sizes (9, 17 and 37 μm) were used to study the effect of hardness, derived from grain refinement as well as cryogenic test temperature, on the wear properties of Ti. In our experiments, a constant load of 10 N and sliding speeds of 0.67, 1.11 and 4.19 m s−1 were used. The coefficient of friction (COF) for this tribo-couple varied between ∼0.25 and ∼0.50. While a steady state was always achieved, a peak in the COF was always noted in case of coarse-grain (37 μm) Ti tested at a sliding speed of 4.19 m s−1. Under the investigated sliding conditions, the wear rate was found to be of the order of 10−3–10−4 mm3 N−1 m−1. The lowest wear rate was recorded in the fine-grain (9 μm) Ti at the highest sliding speed of 4.19 m s−1. The critical analysis of the worn surface topography reveals that the reduced wear rate was due to the formation of adherent and strain-hardened tribolayer. In order to show various dominant wear mechanisms of Ti, a qualitative map was developed in sliding speed–grain size space. Substructure evaluation revealed the formation of a dense array of deformation twins because of the plastic deformation, which often resulted in the subdivision of grains. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008593

Load-settlement response of rectangular and circular piles in multilayered soil / H. Seo in Journal of geotechnical and geoenvironmental engineering, Vol. 135 N°3 (Mars 2009) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N°3 (Mars 2009) . - pp. 420–430 Titre : Load-settlement response of rectangular and circular piles in multilayered soil Type de document : texte imprimé Auteurs : H. Seo, Auteur ; B. Basu, Auteur ; M. Prezzi, Auteur Année de publication : 2009 Article en page(s) : pp. 420–430 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Elastic  analysis  Piles  Settlement  Layered  soils  Variational  principles Résumé : Traditionally, analyses developed for circular piles have also been used for rectangular piles by replacing in calculations the rectangular pile with a circular pile of equivalent area. In this paper, we present a settlement analysis that applies to piles with either rectangular or circular cross sections installed in multilayered soil deposits. The analysis follows from the solution of the differential equations governing the displacements of the pile-soil system obtained using variational principles. The input parameters needed for the analysis are the pile geometry and the elastic constants of the soil and pile. Pile displacements and vertical soil displacements calculated using this analysis match well those from finite-element analysis. A parametric study highlights some important insights for rectangular and circular piles in multilayered soil. A user-friendly spreadsheet program (ALPAXL) was developed to facilitate the use of the analysis. Examples illustrate the use of the analysis in design. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282009%29135%3A3%2842 [...] [article] Load-settlement response of rectangular and circular piles in multilayered soil [texte imprimé] / H. Seo, Auteur ; B. Basu, Auteur ; M. Prezzi, Auteur . - 2009 . - pp. 420–430. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N°3 (Mars 2009) . - pp. 420–430 Mots-clés : Elastic  analysis  Piles  Settlement  Layered  soils  Variational  principles Résumé : Traditionally, analyses developed for circular piles have also been used for rectangular piles by replacing in calculations the rectangular pile with a circular pile of equivalent area. In this paper, we present a settlement analysis that applies to piles with either rectangular or circular cross sections installed in multilayered soil deposits. The analysis follows from the solution of the differential equations governing the displacements of the pile-soil system obtained using variational principles. The input parameters needed for the analysis are the pile geometry and the elastic constants of the soil and pile. Pile displacements and vertical soil displacements calculated using this analysis match well those from finite-element analysis. A parametric study highlights some important insights for rectangular and circular piles in multilayered soil. A user-friendly spreadsheet program (ALPAXL) was developed to facilitate the use of the analysis. Examples illustrate the use of the analysis in design. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282009%29135%3A3%2842 [...]

Two-dimensional sampling rate alteration via one-dimensional techniques / Omrani, Mabrouk 

Public ISBD Titre : Two-dimensional sampling rate alteration via one-dimensional techniques Type de document : texte imprimé Auteurs : Omrani, Mabrouk, Auteur ; B. Basu, Directeur de thèse Editeur : Stevens Institute of Technology Année de publication : 1986 Importance : 107 f. Présentation : ill. Format : 28 cm Note générale : Mémoire de Master : Electrotechnique : New Jersey, Stevens Institute of technology : 1986 Bibliogr. f. 108 - 110 Langues : Anglais (eng) Mots-clés : Sampling  rate  alteration Two-dimensional  signals Filtering  techniques Non-recursive  implementations Dimensional  interpolattion  Digital  filter Index. décimale : Ms00786 Résumé : The problem of sampling rate alteration of deterministic two-dimensional signals is addressed on the basis of frequency domain description of the signal. It is shown that the problem can be formulated in such a way that a solution can be obtained via filtering techniques known for one-dimensional signals. Non-recursive implementations of such interpolation and decimation filters are investigated. The resulting filter structures can potentially be implemented in parallel and/or pipelined architecture for fast real time applications. Experiments with digitized images are also reported to demonstrate the performance of the designed interpolation and decimation filters. Two-dimensional sampling rate alteration via one-dimensional techniques [texte imprimé] / Omrani, Mabrouk, Auteur ; B. Basu, Directeur de thèse . - Castle point, Hoboken, New Jersey : Stevens Institute of Technology, 1986 . - 107 f. : ill. ; 28 cm. Mémoire de Master : Electrotechnique : New Jersey, Stevens Institute of technology : 1986 Bibliogr. f. 108 - 110 Langues : Anglais (eng) Mots-clés : Sampling  rate  alteration Two-dimensional  signals Filtering  techniques Non-recursive  implementations Dimensional  interpolattion  Digital  filter Index. décimale : Ms00786 Résumé : The problem of sampling rate alteration of deterministic two-dimensional signals is addressed on the basis of frequency domain description of the signal. It is shown that the problem can be formulated in such a way that a solution can be obtained via filtering techniques known for one-dimensional signals. Non-recursive implementations of such interpolation and decimation filters are investigated. The resulting filter structures can potentially be implemented in parallel and/or pipelined architecture for fast real time applications. Experiments with digitized images are also reported to demonstrate the performance of the designed interpolation and decimation filters.

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité	Spécialité	Etat_Exemplaire
Ms00786	Ms00786	Papier	Bibliothèque centrale	Mémoire de Master	Disponible

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