Craters
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Microstructure and Liquid Phase Separation of CuCr Alloys Treated by High Current Pulsed Electron Beam
Microstructures of CuCr25 and CuCr50 alloys treated by high current pulsed electron beam (HCPEB) were investigated in this work. The microstructure and solidification behavior of the Cr-rich phases were characterized by scanning electron microscopy (SEM). Results show that a remelting layer of 3~5 μm is formed on the surface of Cu-Cr alloys. The microstruct
Mat. Res.. Publicado em: 23/10/2015
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2. Estudo do desgaste e atrito em ensaios micro-abrasivos por esfera rotativa fixa em condições de força normal constante e pressão constante. / Wear and friction study in micro-abrasive wear testing by rotative fixed ball under conditions of constant normal force and constant pressure.
The micro-scale abrasive wear test by rotative ball has gained large acceptance in universities and research centers, being widely used in studies on the abrasive wear of materials. Two wear modes are usually observed in this type of test: rolling abrasion results when the abrasive particles roll on the surface of the tested specimen, while grooving abrasion
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/06/2011
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3. A scanning electron microscopic study of the patterns of external root resorption under different conditions
OBJECTIVE: The aim of this study was to examine if there are qualitative differences in the appearance of external root resorption patterns of primary teeth undergoing physiologic resorption and permanent teeth undergoing pathological root resorption in different conditions. MATERIAL AND METHODS: A total of 40 teeth undergoing external root resorption in dif
Journal of Applied Oral Science. Publicado em: 2009-10
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4. Effect of Ti and Nb Additions on the Formation of Craters for IF Steel Galvanneal Coatings
Interstitial Free steels feature alloying elements present in an ultra low C matrix that account for C stabilization and consequently a high number of C free interstitials in a ferrite matrix that give these steels the ideal texture, low yield point, favorable plastic strain ratios, high elongation and n-value necessary for an ideal performance on forming pr
Publicado em: 2009
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5. Caracterização geologica e geofisica da estrutura de impacto Domo de Vargeão, SC / Geologic and geophysical characterization of Vargeão Dome impact structure, SC
O Domo de Vargeão (SC), com 12,4km de diâmetro, é uma estrutura de impacto do tipo complexa parcialmente erodida, formada sobre os derrames vulcânicos da Formação Serra Geral, na bacia do Paraná. Em seu interior afloram, de forma anômala, arenitos atribuídos ás formações Botucatu e Pirambóia, normalmente situados a cerca de 1km abaixo da superf�
Publicado em: 2009
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6. Construction and evaluation of a laser induced breakdown spectroscopy instrument: application in alloy samples / Construção e avaliação de um instrumento para espectroscopia de emissão em plasma induzido por laser (LIBS) : aplicação em ligas metalicas
In this work a time resolved LIBS instrument (TRELIBS) was built and its performance evaluated in qualitative and quantitative analysis. Additionally, exploratory studies are presented on the influence of parameters that affect the LIBS analysis. The instrument was built employing optical systems and devices of modern technology: an ICCD device, an echelle p
Publicado em: 2007
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7. Projeto, fabricação e operação de uma máquina de ensaio de erosão por cavitação
The present work deals with the design, fabrication and operation of a cavitation erosion equipment and with the preliminary results obtained by its testing. A new cavitation erosion testing machine was designed, fabricated and tested, using a rotating disc with holes for generating cavitation. The developed equipment has as main advantages, in relation to t
Publicado em: 2007
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8. Ultra-structural evaluation of root canal dentine submitted to Nd:YAG laser irradiation associated to different chemical solutions / Avaliação ultraestrutural da dentina radicular submetida à irradiação do laser Nd:YAG associada a diferentes substâncias químicas
The aim of this study was to evaluate the dentin morphology after the application of Nd:YAG laser, using different chemical substances used to irrigate the radicular canals. Thirty and six sound superior teeth were prepared by the Crown-Down technique and the roots were sectioned longitudinally and randomly distributed in 4 groups: distilled water; 17% EDTAC
Publicado em: 2005
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9. Electron microscope study of PNH red cells and AET-treated normal red cells (PNH-like cells)
The morphology of red cells damaged by 2-aminoethylisothiouronium bromide (AET) has been compared to that of PNH cells by transmission and scanning electron microscopy. The main features of the effect of AET as demonstrated by the scanning electron microscope were spherical and deformed cells, with surface craters and relatively large pits. The transmission
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10. Hemadsorption by colonies of Ureaplasma urealyticum.
Hemadsorption by colonies of Ureaplasma urealyticum and Mycoplasma pneumoniae differed quantitatively and qualitatively. Using standard methodology, few strains of U. urealyticum hemadsorbed; with a modified method, most strains hemadsorbed, indicating a second type of association. Scanning electron microscopy of tannin-osmium-stained preparations showed gui
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11. An ultrastructural study of keratinized epithelia in the rat soft palate.
The three kinds of keratinized epithelium evident on gross examination of the soft palate of Wistar albino rats were studied by scanning and transmission electron microscopy. Scanning indicated a central area where the epithelium showed numerous fine folds and papillae, more lateral areas which were smooth, and most lateral areas with fine folds only. At hig
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12. Healing of cervical epithelium after laser ablation of cervical intraepithelial neoplasia.
Healing of cervical epithelium was studied in 30 patients after destruction of cervical intraepithelial neoplasia using a carbon dioxide laser. Repeated examinations, using photography and colposcopically directed punch biopsies, were made from the eighth to the 32nd day after treatment. The biopsy specimens were submitted to examination by light and transmi