Materials Literature
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En el presente trabajo se investigó el efecto de la atmósfera y el tiempo de molienda sobre las fases, microestructura y composición de polvos de cobre y de una mezcla cobre – 2,5 % litio, sometidas a aleado mecánico. La molienda se realizó en un molino SPEX 8000D empleando contenedores y bolas de acero. Las dos atmós…
This paper presents the optimisation on the design of the lining of an electric arc furnace that produces refined ferromanganese by applying the nodal wear model. This model is a new tool that systematises the wear/corrosion analysis applied to industrial furnaces linking the basic theoretical knowledge of the physica…
Author: Dörsam, G. et al.; Genre: Journal Article; Finally published : 2009; Keywords: walstromite, CaSiO3-SrSiO3 solid solution, high-pressure synthesis, KD-mineral-fluid, crystal structure; Title: Crystal structure refinement of synthetic Ca0.43Sr0.57[SiO3]-walstromite and walstromite-fluid Ca-Sr distribution at upp…
We consider local magnetic moments coupled to conduction electrons with on-site attraction in order to discuss the interplay between pairing and magnetic order. We probe the ground-state properties of this model on a one-dimensional lattice through pair binding energies and several correlation functions calculated by…
During compression molding of sheet molding compounds air bubbles are formed that can deteriorate several properties of the final composite. The story of such bubbles is directly set by the local pressure distribution during pressing. A number of experiments have therefore been performed in order to derive the relatio…
Nanotechnology aims to design supramolecular systems able to perform complex functions. The selection of suitable building blocks and the control over their physicochemical properties play key roles in the chances of success. Here we summarize ideas that motivated our recent investigations focusing on the contribution…
The vapor-phase polymerization (VPP) of poly(3-hexylthiophene) (P3HT) was achieved successfully as an alternative method to conventional solution-based thin film fabrication. Using Fe(III)Cl(3).6H(2)O, a spontaneous reaction of 3-hexylthiophene monomers resulted in the rapid formation of conducting P3HT thin films dir…
Cp*W(NO)( n -alkyl)(η 3 -allyl) complexes result from the selective activations of the terminal C−H bonds of alkanes. Consequently, the reactions of prototypical members of this family of complexes with a range of electrophiles and nucleophiles have been explored with a view to developing methods for functionalizing t…
The present study shows the effect of porosity on the dynamic elastic moduli of partially dense yttria (Y 2 O 3 ). This article reveals that the sound velocities and the elastic moduli of the porous samples depend not only on density, but also upon the reciprocal of the initial particle and agglomerate size. These fin…
A reactive processing method was used to produce dense (>99.5% relative density) W/Ta 2 C/Ta 2 WO 8 cermets from Ta 2 O 5 , WC, TaC, and phenolic resin. The powder compacts were reacted under vacuum at 1450°C and then densified at 1850°C. The microstructure of the cermets was examined using scanning electron microscop…
We report here on the synthesis of three new prototypes (types I-III) of very large fullerene-based polyelectrolytes which can carry up to 60 charges on their periphery. All fullerene moieties incorporated in these macromolecular structures have an octahedral hexakisaddition pattern. Dumbbell-shaped icosacarboxylate 5…
When tetrathionate-grown Acidithiobacillus ferrooxidans ATCC 23270 cells were incubated with ferric ions and tetrathionate at pH 3.0, ferrous ions were produced enzymatically. Fe(3+)-reductase, which catalyzes Fe(3+) reduction with tetrathionate, was purified to homogeneity not only from tetrathionate-grown, but also…
Two salt-free Zn(2+)-ligand-coordinated vesicle phases were prepared from the mixtures of alkyldimethylamine oxide (C(n)DMAO, n = 14 and 16, i.e., C(14)DMAO and C(16)DMAO) and zinc laurate [(CH(3)(CH(2))(10)COO)(2)Zn] in aqueous solution. The two salt-free Zn(2+)-ligand-coordinated vesicle phases were subsequently use…
Erosion behavior of polyetherketone (PEK) reinforced by short glass fibers with varying fiber content (0—30 wt%) has been studied. Steady-state erosion rates have been evaluated at different impact angles (15°—90°) and impact velocities (25—66 m/s) using silica sand particles as an erodent. PEK and its composites exhi…
X-ray tomography was applied to the investigation of the structure of sinter mixture granules. Different components such as ore, concentrate, coke breeze and limestone were identified and their sizes and spatial distribution estimated. Classification of the granule structure by the thickness of the adhering fines laye…
Abstract In this study, we investigated the effect of electron donor structures on the shelf life of three‐component initiator systems which also included methylene blue (MB) as a photosensitizer and diphenyl iodonium salt (DPI) as an electron acceptor. For this research, N‐phenylglycine (NPG), N‐methyldiethanolamine…
The fulgurite of Torre de Moncorvo (Portugal) was formed by lightning striking a small electricity pylon; it consists morphologically of a central cylinder with radial ramifications several metres long. It is largely composed of glass, with the remains of quartz crystals and neoformed cristobalite. This paper reports…
Studies of a synthesis of KTaO 3 displayed a two‐step reaction path with the intermediate formation of K 2 Ta 4 O 11 . Thermal and X‐ray diffraction analysis showed that the synthesis is completed at 900°C. Sintering studies showed that KTaO 3 powder can produce single phase ceramics with 85% of relative density with…
We investigate the dependence of proton affinity values of the side chains of amino acids such as Asp, Glu, His, Ser, and Thr on confinement in a single-walled carbon nanotube. The proton affinity values, estimated using the density functional theories (PW91/dnp and BLYP/dnp), are found to be highly sensitive toward c…
In an earlier work, it was observed that the use of MoSi 2 (up to 10 wt%) enhanced the densification and mechanical properties of TiB 2 . Therefore, the motivation of this study is three‐fold: (a) to assess whether a small amount of MoSi 2 addition can enhance wear resistance property, (b) to study whether the MoSi 2…