Materials Literature
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The ultra high temperature ceramic composites (UHTCC) are of interest for hypersonic vehicle leading edge. The ultrasonic testing is one of the widely used non-destructive testing (NDT) for the material characterization. The aim of investigations described in this article is measurement of the mechanical properties of…
nossas grandes "parcerias".
Abstract Review: 67 refs.
Polycyclic aromatic hydrocarbon (PAH) compounds including 3-methylcholanthrene induce harmful reactive intermediates and reactive oxygen species. This study reports the effect of 3-methylcholanthrene on the accumulation of vitamin C and the expression of vitamin C transporters. ODS rats were given l-ascorbic acid dail…
This paper describes a methodology for the synthesis of materials degradation data with nuclear power plant service data to estimate the long-term failure rates of passive components.
Removal of sulfur-containing compounds from gasoline, based on the combination of various technologies (liquid-liquid extraction and extraction- photocatalysis-oxidation desulfurization) using a biphasic system (oil/acetonitrile) has been investigated. The effect of operation conditions on desulfurization rates and th…
This paper presents a case study of a Prestressed Concrete Cylinder Pipe (PCCP) system that is experiencing deterioration and a failure resulting from internal corrosion. The corrosion mechanism is Sulfuric Acid attack due to Hydrogen Sulfide gas (H2S) generated from the wastewater. The PCCP pipeline is located in Reg…
A novel solid acid-base catalyst Cat-NH(CH3)2 with aluminum and nitrogen was prepared from phenol and formaldehyde by using the triblock copolymer Pluronic F127 as a template and resol as a catalyst precursor via evaporation induced by the organic–organic assembly method. The catalyst was characterized by Fourier tran…
Collagen modifications in the tissues of an annulus fibrosus under moderate-intensity IR laser irradiation at various pulse durations and frequencies were studied. Changes at various levels of the ordered structural hierarchy of collagen in tissues were detected by differential scanning calorimetry, multiphoton micros…
The work function of 75W25Re alloy has been determined by the thermionic emission method aided by computer simulation of resistive heating of a cathode made of the alloy wire. The obtained values are temperature dependent, which is due to desorption of oxygen atoms which enhance the work function. The lowest value of…
Abstract Single crystals of the title compound are obtained from a melt of U3O8, MoO3, and excess Cs2CO3 (Pt crucible, 950 °C, 12 h, cooling rate 5 °C/h).
Abstract Title compounds (III) are obtained either by thermal or microwave‐assisted reaction between phthalodinitrile, arylacetonitriles and metallic magnesium.
Recently, the c(4 × 2) reconstruction of the technologically highly important Si(001) surface was evidenced at low temperatures (below 200 K). High-resolution X-ray photoelectron spectroscopy (XPS) revealed a wide variety of surface states, whereas a study by scanning tunneling microscopy (STM) of the in situ oxidatio…
Abstract Review: 233 refs.
Este trabalho tem por objetivo investigar a etapa de decapagem acida e os processos de desidrogenacao e retrabalho realizados durante a zincagem de parafusos quanto a fragilizacao por hidrogenio. Parafusos fabricados conforme a norma JIS B 1127 (1995), cementados, de 6 mm de diâmetro e 16 mm de comprimento de rosca fo…
Dalam sistem penghantaran obat (drug delivery system), kemampuan untuk mengontrol ukuran, morfologi dan drug release suatu partikel obat merupakan hal yang mendasar. Karakterisitik obat yang unggul sangat penting untuk memastikan jumlah bioaktif yang dihantarkan sesuai dengan yang diperlukan oleh tubuh. Penelitian ini…
Preliminary studies on field emission (FE) arrays comprised of carbon nanotubes (CNT) as an electron source for electric propulsion system show remarkably promising results. Design parameters for a carbon nanotube (CNT) field-emission device operating on triode configuration were numerically simulated and optimized in…
Neste trabalho foram realizadas algumas deposies de filmes de Nitreto de Titnio sobre substrato de ao inoxidvel. Foi utilizado o processo conhecido como triodo magnetron sputtering. Os parmetros de deposio foram mantidos entre as deposies, exceto pela voltagem de bias no substrato, que foi variada de uma deposio para…
In this communication we discuss SU(1,1)- and SU(2)-squeezing of an interacting system of radiation modes in a quadratic medium in the framework of Lie algebra. We show that regardless of which state being initially considered, squeezing can be periodically generated.
The interaction of water with the fluorine-covered (001) surface of anatase titanium dioxide (TiO) has been studied within the framework of density functional theory (DFT). Our results show that water dissociation is unfavorable due to repulsive interactions between surface fluorine and oxygen. We also found that the…