Autor: Pinto, H. C. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Oxide Layer Evolution of Cast Fe24Cr12NiXNb Heat-Resistant Cast Steels at 900°C in Atmospheric Air
Autorzy:: Ramos, P. A.
Coelho, R. S.
Pinto, H. C.
Soldera, F.
Mücklich, F.
Brito, P. P.
Powiązania:: https://bibliotekanauki.pl/articles/1837826.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: austenitic cast steel
microstructure
Nb-alloyed steels
oxidation
staliwo austenityczne
mikrostruktura
stal stopowa
utlenianie
Opis:: The austenitic stainless steels are a group of alloys normally used under high mechanical and thermal requests, in which high temperature oxidation is normally present due to oxygen presence. This study examines the oxide layer evolution for Fe24Cr12NiXNb modified austenitic stainless steel A297 HH with 0,09%Nb and 0,77%Nb content at 900°C under atmospheric air and isothermal oxidation. The modifiers elements such as Mo, Co and Ti, added to provide high mechanical strength, varied due to the casting procedure, however main elements such as Cr, Ni, Mn and Si were kept at balanced levels to avoid microstructure changing. The oxide layer analysis was performed by confocal laser scanning microscopy (CLS) and scanning electron microscopy (SEM). The elemental analysis of the different phases was measured with energy dispersive X-ray spectroscopy (EDX). The Nb-alloyed steel generated a thicker Cr oxide layer. Generally elemental Nb did not provide any noticeable difference in oxide scale growth, for the specific range of Nb amount and temperature studied. High temperature oxidation up to 120h was characterized by protective Cr oxidation, after this period a non-protective Fe-based oxidation took place. Cr, Fe and Ni oxides were observed in the multilayer oxide scale.
Źródło:: Archives of Foundry Engineering; 2021, 21, 1; 125-131
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: rRNA gene expression and location in triticale assayed by silver staining and in situ hybridisation techniques
Autorzy:: Lima-Brito, J.
Carvalho, A.
Matos, C.
Heslop-Harriso, Pat
Guedes-Pinto, H.
Powiązania:: https://bibliotekanauki.pl/articles/2198862.pdf
Data publikacji:: 2005-06-23
Wydawca:: Instytut Hodowli i Aklimatyzacji Roślin
Tematy:: amphiploids
in situ hybridisation
nucleolar dominance
rDNA
silver staining
triticale
Opis:: In durum wheat × rye hybrids and the derived amphiploid triticale, AABBRR, the expression of the 1R rRNA genes is largely suppressed. Alloauto-octoploid triticales, AABBRRRR, allows the evaluation if rye NOR inactivation can be overcome by the increase of rye genome number. In the present work, we used silver staining and in situ hybridisation techniques in order to study the nucleolar activity and to localize the rRNA genes in hexaploid and alloauto-octoploid triticales. The use of rye genomic DNA as probe allowed the identification of the rye chromosomes present in both hexaploid and octoploid triticales (14 and 28, respectively). The simultaneous use of the ribosomal sequence enabled the localisation of 18S-25S rDNA on the satellite chromosomes of both triticales. On hexaploid triticale we detected six rDNA sites (four on wheat chromosome pairs 1B and 6B and two on rye chromosome pair 1R), whereas on alloauto-octoploid triticale eight rDNA sites (four on wheat-pairs 1B and 6B and four on rye chromosome pairs 1R) were observed. As expected, the maximum number of active Ag-NORs per metaphase cell was coincident with the maximum number of nucleoli per interphase nucleus confirming that all and only the NORs functionally active during interphase are stained by silver at the next mitotic metaphase. Comparison of the nucleolar activity between hexaploid and octoploid triticales analysed here indicates that the increase in 1R chromosomes from two to four does not change the suppression of rye nucleolar activity. This supports the suggestion that genomic interactions are under strong genetic control.
Źródło:: Plant Breeding and Seed Science; 2005, 51; 3-10
1429-3862
2083-599X
Pojawia się w:: Plant Breeding and Seed Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Fatigue design and prevention in movable scaffolding systems
Projektowanie ruchomych systemów rusztowań z uwzględnieniem obciążęń zmęczeniowych
Autorzy:: Coelho, H.
Torres, A.
Pacheco, P.
Moreira, C.
Silva, R.
Soares, J. M.
Pinto, D.
Powiązania:: https://bibliotekanauki.pl/articles/396185.pdf
Data publikacji:: 2017
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: mosty
Movable Scaffolding System
MSS
system ruchomych rusztowań
obciążenia zmęczeniowe
bridge construction
fatigue
Opis:: The Movable Scaffolding System (MSS) is a heavy construction equipment used for casting situ of concrete bridge decks. In the past decades, MSSs have become increasingly complex and industrialized, enlarging its span ranges, incorporating auxiliary elevation machinery and increasing productivity. The tendency nowadays is for strong reutilization and the notion of MSS as a disposable or temporary structure is somehow reductive. The main structure of MSSs may be potentially exposed to fatigue, usually characterized by low number of cycles with significant stress amplitude. Fatigue may be prevented through adequate design; judicious selection of materials; demanding quality control and implementation of robust inspection and maintenance plans.
System ruchomych rusztowań – Movable Scaffolding System (MSS) to ciężki konstrukcja budowlana wspomagająca wykonanie betonowych mostów. W ostatnich dekadach MSS stały się coraz bardziej skomplikowane i uniwersalne, stanowią element nośny dla wielu urządzeń zarówno podczas wykonywania mostu jak i podczas eksploatacji. Główna struktura systemów MSS może być narażona na efekt zmęczenia, obiążenia zwykle charakteryzują się niską liczbą cykli o znacznej amplitudzie naprężeń. Zmęczeniu można zapobiec poprzez odpowiedni projekt i rozsądny dobór materiałów. Jest to konstrukcja wymagająca ścisłej kontroli jakości i wdrożenia solidnych planów inspekcji i konserwacji.
Źródło:: Civil and Environmental Engineering Reports; 2017, No. 25(2); 77-88
2080-5187
2450-8594
Pojawia się w:: Civil and Environmental Engineering Reports
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Effect of Shot Peening With Glass Microspheres on the Fatigue Behavior of a Low Carbon Steel
Autorzy:: de Lacerda, J. C.
Pereira, I. R.
Costa, J. M. G.
Pinto, J. S.
Souza, H. F. M.
Fonseca, M. A.
Powiązania:: https://bibliotekanauki.pl/articles/352156.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: fatigue
shot peening
Wöhler curve
low carbon steel
glass microspheres
Opis:: The present work has the objective of studying the effect of shot peening with glass microspheres on SAE 1020 steel in its resistance to fatigue. Fatigue tests were carried out by rotary bending with load control and loading on balance in specimens with and without shot peening. A rotation speed of approximately 750 rpm (12.5 Hz) was employed in the fatigue tests. Vickers microhardness tests were performed in order to verify the surface hardening produced by shot peening with glass microspheres. Analysis of the steel surface and fatigue fractures was performed using scanning electron microscopy (SEM). Fatigue tests were performed in order to obtain S-N curves (Wöhler curves). It was observed that shot peening with glass microspheres improved the fatigue strength of the steel at high cycle.
Źródło:: Archives of Metallurgy and Materials; 2019, 64, 4; 1513-1518
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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