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Mechanical Analysis for the Design of a Fibre Reinforced Pelvic Prosthesis with the Aid of CAD/CAE-Techniques
Filament Winding Technology: A Numerical Simulation And Experimental Validation of the Winding And Curing Phases
El corte de rocas ornamentales con discos diamantados: influencia de las características petrográficas de la roca
This paper follows another one published in the preceding number of this same journal, that reviewed some scientific papers on the influence of the factors of the cutting equipments (machinery, cutting characteristics, disks, etc) on the efficiency of the cutting process of ornamental rocks with diamond disks. In this…
Assessment of thermal shock induced damage in silicon carbide fibre reinforced glass matrix composites
The development of microstructural damage in silicon carbide fibre (Nicalon™) reinforced glass matrix composite samples subjected to thermal shock was investigated by using a nondestructive forced resonance technique and fibre push out indentation tests. Thermal shock testing involved quenching samples in a water bath…
A SiC/SiC Composite Produced By Polymer Pyrolysis of Polydiphenylcarbosilane
Improving the Marine Water Corrosion Resistance of HVOF Steels Coated with WC+12%Co+4%Cr
An Assessment of the Impact Response of Knit/Knit Stitch Fabric Reinforced Epoxy Composites
Effects of Second Phase Dispersions on Microstructure and Mechanical Properties in MgO/SiC Nanocomposites
Información Bibliográfica
Influence of relative humidity and temperature on-site corrosion rates
When the steel rebar depassivates, the corrosion starts to develop at a rate which mainly depends upon the moisture content in the concrete pores. In natural outdoor exposure conditions, the moisture content will depend not only on the relative humidity of the atmosphere but also upon the temperature cycling occurring…
Degradation of Nylon-6 By Glycolysis. Part 1: Identification of Degradation Products
Glycolysis of nylon-6, in the presence of phosphoric acid at 250°CC, leads to a mixture of low molecular weight compounds. HPLC analysis combined with 1H-NMR and mass spectroscopy showed that the main degradation products were ethylene glycol derivatives of caprolactam and linear oligomers. No cyclic oligomers were fo…
Crystallization and Strength of Natural Rubber and Synthetic cis-1,4-Polyisoprene
Abstract Crosslinked samples of natural rubber (NR, SMR-5L) and a synthetic cis -1,4-polyisoprene (IR, Natsyn 2200, The Goodyear Tire & Rubber Company) were crystallized at −25 °C at various strains, and then slowly melted. Crystallization was somewhat slower for IR under all conditions, taking two to three times…
A New Low‐Brittleness Glass in the Soda‐Lime‐Silica Glass Family
In the soda‐lime‐silica glass family, the effect of each constituent of the composition on the brittleness was first investigated. Vickers indentation was employed to estimate the brittleness (ratio of harness ( H ) to fracture toughness ( K c )) by measuring the C / a ratios (where C and a are the characteristic crac…
Active Sites Imaging for Oxygen Reduction at the La0.9Sr0.1MnO3 − x /Yttria‐Stabilized Zirconia Interface by Secondary‐Ion Mass Spectrometry
Active sites for oxygen reduction were investigated at the interface of (LSM)/yttria‐stabilized zirconia (YSZ). Isotopic oxygen ( 16 O/ 18 O) exchange under cathodic polarization and secondary‐ion mass spectrometry (SIMS) analysis were examined to visualize the oxygen reduction active sites. The LSM mesh pattern elect…
Hertzian‐Crack Suppression in Ceramics with Elastic‐Modulus‐Graded Surfaces
Hertzian (spherical) indentation experiments were carried out in a graded alumina‐glass composite whose Young's modulus increased with depth beneath the indented surface. An in situ processing method involving impregnation of a dense, fine‐grained alumina by an aluminosilicate glass was employed to fabricate such a co…
Adsorption of Anionic Dyes on the Biopolymer Chitin
The adsorption of the anionic dyes orange IV, orange G and xylenol orange on chitin was studied, employing the Langmuir isotherm. The adsorption parameters were determined utilizing various linear regressions of the isotherm. The results showed that the adsorption capacity is dependent on pH. In acid pH, the polymer a…
Malate dehydrogenase: distribution, function and properties.
Malate dehydrogenase (MDH) (EC 1.1.1.37) catalyzes the conversion of oxaloacetate and malate. This reaction is important in cellular metabolism, and it is coupled with easily detectable cofactor oxidation/reduction. It is a rather ubiquitous enzyme, for which several isoforms have been identified, differing in their s…
Monodisperse Enantiomeric Lactic Acid Oligomers: Preparation, Characterization, and Stereocomplex Formation
d - and l -lactic acid oligomers were synthesized by polymerization of d - or l -lactide using 2-(2-methoxyethoxy)ethanol (MEE) and stannous octoate as initiator and catalyst, respectively. The average degree of polymerization (DP av ) of the oligomers could be tailored by the monomer/initiator ratio. HPLC and GPC ana…
Range dependence of interlayer exchange coupling
We have considered the effects of non magnetic impurities and interface roughness on the interlayer coupling between magnetic layers in metallic multilayers. The two types of defects alter the interlayer coupling in quite different ways. Elastic electron scattering by impurities in the non magnetic spacer layers betwe…