Editorial
Francisca Puertas Maroto2006-09-01Materiales de Construccion
Materials Literature
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Editorial
Conversion of rice hull ash into soluble sodium silicate
Sodium silicate is used as raw material for several purposes: silica gel production, preparation of catalysts, inks, load for medicines, concrete hardening accelerator, component of detergents and soaps, refractory constituent and deflocculant in clay slurries. In this work sodium silicate was produced by reacting ric…
Surface characterization of alumina reinforced with niobium carbide obtained by polymer precursor
Active filler controlled pyrolysis of polymers (AFCOP) is a recent method for obtaining near-net shaped ceramic bodies. Alumina based composites have been developed for use as cutting tools, so knowledge of the surface composition is extremely important because it is directly related to the hardness and wear resistanc…
Electronic ceramics based on polycrystalline SnO2, TiO2 and (Sn xTi1-x)O2 solid solution
In the present text we discuss on electronic properties arising from polycrystalline semiconductor ceramics of SnO2, TiO2 and (Sn xTi1-x)O2 solid solution rutile-type structure. This is intended to be a short overview of the most recent papers in this area. One of the most important content discussed in this text is b…
Numerical and Experimental Investigation into Dynamic Delamination Propagation of Axially Impacted Laminated Composite Beams
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Materials Research - Ibero-american Journal of Materials: judicious, fair and educative!
Compression tests of castor oil biopolymer
Many methods have been developed to test and evaluate the mechanical properties of the biopolymer from castor oil employed in implants and osteo-repositions, among other things. Most of the methods are performed under quasi-static and cyclic loads (creep and relaxation tests) and under high strain rate, uniaxial compr…
Effect of tire rubber particles on crack propagation in cement paste
Tire rubber particles (NaOH-treated and untreated) were investigated as possible crack stabilizer and toughness enhancer when added to cement paste through in situ crack propagation measurements using two different types of cement, type I/II and an Interground polypropylene Fiber Cement (IFC). Crack deflection and cra…
Effect of exposure time vs. irradiance on knoop hardness of dental composites
A comparison was made of the hardness of Z250 and Esthet-X composites light cured with different light sources. Cavities (3 mm diameter x 6 mm deep) were prepared in 240 bovine incisors. The composite was bulk inserted and light-cured using halogen light, LED or xenon plasma arc (PAC) with different irradiances and ex…
Comparison of the corrosion resistance of DIN W. Nr. 1.4970 (15%Cr-15%Ni-1.2%Mo-Ti) and ASTM F-138 (17%Cr-13%Ni-2.5%Mo) austenitic stainless steels for biomedical applications
The resistance to localised corrosion of the full austenitic 15%Cr-15%Ni-1.2%Mo titanium stabilized stainless steel (DIN W. Nr. 1.4970) was investigated by electrochemical methods including electrochemical impedance spectroscopy (EIS), potentiodynamic polarization and potentiostatic polarization measurements in a phos…
Characteristic compression strength of a brickwork masonry starting from the strength of its components. Experimental verification of analitycal equations of european codes
In this paper the compression strength of a clay brickwork masonry bound with cement mortar is analyzed. The target is to obtain the characteristic compression strength of unreinforced brickwork masonry. This research try to test the validity of the analytical equations in European codes, comparing the experimental st…
Fiberglass-reinforced glulam beams: mechanical properties and theoretical model
The glued-laminated lumber (glulam) technique is an efficient process for making rational use of wood. Fiber-Reinforced Polymers (FRPs) associated with glulam beams provide significant gains in terms of strength and stiffness, and also alter the mode of rupture of these structural elements. In this context, this paper…
Mathematical representation of solubility of amino acids in binary aqueous-organic solvent mixtures at various temperatures using the Jouyban-Acree model.
Applicability of a solution model for calculating solubility of amino acids in binary aqueous-organic solvent mixtures at various temperatures was shown. The accuracy of the proposed model was evaluated by computing mean percentage deviation (MPD) employing available solubility data of amino acids in binary solvents a…
Influence of annealing on the structural and optical properties of ZnO:Tb thin films
The influence of annealing on the morphological, structural, and optical properties of ZnO:Tb thin films on Si substrate grown by magnetron cosputtering is investigated. It has been found that the ZnO:Tb thin films with structures of tetrapod and screwlike nanorod are formed after annealing at temperature of 950°C. X-…
Controlled crystal growth of layered-perovskite thin films as an approach to study their basic properties
This article describes the current progress in thin bismuth layer-structured ferroelectric films (BLSFs) including SrBi2Ta2O9 and (Bi,La)4Ti3O12, particularly those developed in the last ten years. BLSF thin films can be applied to ferroelectric random access memories because of their durable fatigue-free properties a…
Influence of the relaxation of Maxwell-Wagner-Sillars polarization and dc conductivity on the dielectric behaviors of nylon 1010
The effects of dc conductivity and Maxwell-Wagner-Sillars (MWS) polarization on the dielectric behaviors of nylon 1010 have been investigated by means of dielectric relaxation spectroscopy. The experimental dielectric data were analyzed within the formalisms of dielectric permittivity, complex electric modulus, and co…
Development of single‐crystal CVD‐diamond detectors for spectroscopy and timing
Abstract Charge‐transport parameters measured for several single‐crystal CVD‐diamond films are discussed as well as the consequences for the energy‐ and the time resolution of charged‐particle detectors made of these samples. Applying a transient‐current technique, where 241 Am α‐particles are used for e–h pair creati…
TECHNIQUE OF IMPROVEMENT OF BUSINESS-PROCESSES AT INFORMATION SYSTEMS DESIGNING ON EXAMPLE OF SOTT OPEN SOCIETY "ROSNEFT-KRASNODARNEFTEGAZ"
The brief characteristic and a technique of realization of the analysis and improvement of administrative and industrial business business-processes are given in the article. The offered approach and a technique of realization of research of business-processes allow to develop information systems at the enterprises an…
ON THE INTEGRAL EQUATION OF THE FIRST KIND RESIDUAL IN THE PROJECTION METHOD
In the previous papers for the integral Fredgholm equation of the first kind with a degenerate kernel the generalized (non regularizing) version of the projection method was developed, based on the arbitrary choice of the basis combined with some a priori estimations for the error of the solution. These estimations de…