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Determination of iron sulphides in roofing slates from the north west of Spain
The most important production of roofing slates in the world is quarried from the Ordovician formations of the Truchas Syncline, which have the largest amount of working quarries. Roofing slates, sometimes, have crystallized iron sulphides such as pyrite, pyrrhotite and other minerals. These iron sulphides oxidise and…
Kinetic study of a grinding system in a cuban cement factory
A kinetic study realized in a moulding system in a cement factory ("Palmarito de Cauto" Santiago de Cuba) is presented. This objective of this study is the production of a pozzolonic cement PZ-250 with an addition until 40% of pozzolan. The present paper confirms the satisfactory predictions and permits to recommend t…
Effect of a Shot Peening Pre Treatment on the Fatigue Behaviour of Hard Chromium on Electroless Nickel Interlayer Coated AISI 4340 Aeronautical Steel
Multiple layer systems of coatings are considered to have larger resistance to crack propagation in comparison to coatings with simple layer. With regard to fatigue, it is possible to improve the resistance of a component with the application of shot peening treatment, whose compressive residual stresses delay or elim…
Determination of CTOD C in Fibre Metal Laminates by ASTM and Schwalbe Methods
Fibre Metal Laminates (FMLs) have arisen as a demand of the aeronautical industry to use thin sheets with high resistance to fatigue crack growth, high damage tolerance, corrosion resistance and high specific strength. Considering these requirements, FMLs are an advantageous choice when compared to metal alloys curren…
Editorial
Corrigendum: F. García-Garmilla, I. Rodríguez Maribona, M. Cano, M. Zalbide, J. A. Ibáñez-Gómez, E. Osa-Chans, S. Garín (2002), Materiales de Construcción, Vol 52, No 266: 12
Erratum
Calculo de Parámetros Electrónicos Para el Grafito Bernal
Using ab-initio calculation, we have computed different electronic parameters associated with the transport coefficients of graphite Bernal. Software CRYSTAL¹ was used with a Pople standard STO- 21G* basis set. Different hamiltonians were tested, choosing a restricted Hartree-Fock one, because it generated the best qu…
Estimation of the Plain High-Cycle Fatigue Propagation Resistance in Steels
In this work a method to estimate the high cyclic fatigue propagation life of steel specimens under constant loading is presented. This method is based in experimental evidence that the fatigue limit represents the threshold stress for the propagation of nucleated cracks, so that both the fatigue limit and the fatigue…
Experimental and Numerical Investigation Into Metallocene Polymer Melt Flow in Film Blowing Dies
A frequent problem in the production of metallocene linear low-density polyethylene (mLLDPE) films is the occur-rence of flow instabilities, e.g. sharkskin, or degradation of material, which limit the production rate and decrease the product quality. If such problems arise, the question is what causes these phenomena…
Rheological Interpretation of the Slump Test
We examine the validity of the slump test for predicting the yield stress of polymeric suspensions and mineral suspensions. First we propose a modification of this test: in order to make measurements on fluids with high yield stress (of the order of several hundreds of Pascal) we add a mass at the sample top. From det…
The Inlet Engine Valves Grinding Using Different Types of Cutting Fluids and Grinding Wheels
In this paper an experimental research is presented in which different types of cutting fluids (a cutting oil and three different types of soluble oils) and grinding wheels (alumina and vitrified CBN) were tested in the inlet engine valves grinding. As evaluation parameters the workpiece residual stress and the grindi…
Surface modification of fique fibers. Effect on their physico‐mechanical properties
Abstract A study has been performed to assess the possibilities of fique fibers (a Colombian native fiber) as reinforcement for polymeric matrices. The fique fibers were treated using different chemical surface treatments. The effect produced on the physico‐mechanical properties of fique fibers have been investigated.…
Local Approach to Fracture of an Aged Duplex Stainless Steel
The local approach to fracture (LAF) is a methodology aimed to calculate macroscopic fracture properties of a body, from the knowledge of the local stress - strain field at the fracture site, and the modeling of the acting fracture mechanisms. In the present work, this method was applied to a CF8M steel, aged 30000h a…
Identification of components in smectite/kaolinite mixtures
Abstract Mechanically-prepared binary mixtures of two dioctahedral smectites (of different chemical compositions) with two kaolinites (with different amounts of structural defects) were studied by infrared (IR) spectroscopy to verify the ability of IR spectroscopy to detect small amounts of individual components in th…
Biomaterials and Scaffolds in Reparative Medicine
Most approaches currently pursued or contemplated within the framework of reparative medicine, including cell-based therapies, artificial organs, and engineered living tissues, are dependent on our ability to synthesize or otherwise generate novel materials, fabricate or assemble materials into appropriate 2-D and 3-D…
DAILY FLUCTUATIONS OF EXOPOLYMERS IN CULTURES OF THE BENTHIC DIATOMS CYLINDROTHECA CLOSTERIUM AND NITZSCHIA SP. (BACILLARIOPHYCEAE)1
Dynamics in the production of extracellular polymeric substances (EPS) were investigated for the benthic diatoms Cylindrotheca closterium (Ehrenberg) and Nitzschia sp. The effect of growth phase and light:dark conditions were examined using axenic cultures. Two EPS fractions were distinguished. Soluble EPS was recover…
Geomagnetically Induced Current Effects on Transformers
Geomagnetically induced currents (GIC) can cause saturation of the magnetic circuit of transformers in a power system. This saturation can increase the Mvar absorption of the transformers leading to voltage control problems, generate significant harmonic currents and cause heating of the internal components of the tra…
Optical Spectroscopy Study on β-Ga2O3
Undoped β-Ga 2 O 3 single crystals were grown by the floating zone technique under different conditions, and subsequently annealed in O 2 . Excitation and luminescence measurements were correlated with optical absorption, Hall- and electron-paramagnetic resonance measurements. It is shown, that the UV luminescence doe…