Materials Literature
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This paper presents the results of an experimental investigation carried out to optimize the mix proportions of the fly ash brick by Taguchi method of parameter design. The experiments have been designed using an L9 orthogonal array with four factors and three levels each. Small quantity of cement has been mixed as bi…
Spain is a world-wide leader in roofing slate production, quarriying more than 600,000 tons of slate of great quality and generating around 300 euros million in sales each year. However, an enormous quantity of slate plates is considered as a low quality product or discarded every year as waste. The application of pro…
There is a plethora of routes to produce hydroxyapatite(HA) and in general calcium phosphates(CP) but production usually leads to a mixture of several phases. Besides ionic contamination, most of these methods are cumbersome, restricted to small volumes of product and require a lot of thermal energy. The acid-base rou…
Abstract An electrical method has been used to study capillary rise in fabrics. This method is based on the measure of the electrical resistance and leads to the determination of time-space water content evolution. The obtained results allowed us to deduce the capillary pressure curve of the fabrics and the flow veloc…
We develop several strategies for the synthesis of novel templates based on a solution method aimed at the synthesis of hollow structures for functional materials. Hollow ZnO microrings are successfully established using a new sacrificial template route by employing insoluble salts as the template. We also develop an…
Site modification in BiFeO3 films was investigated using Raman spectroscopy and piezoelectric force microscopy to explore effect of A- and B-site modifications on structural evolution and ferroelectric behavior of doped BiFeO3 films. Our Raman results revealed the subtle structural changes in the BiFeO3 films caused b…
High-quality ZnSe/CdS core/shell nanocrystals, exhibiting a type II carrier localization regime, were fabricated via a traditional pyrolysis of organometallic precursors. The two-step synthesis involved fabrication of 4.5−6 nm ZnSe seeds followed by a subsequent deposition of the CdS shell. An efficient spatial separa…
The salt crystallization test is used to evaluate damage caused by soluble salts that penetrate stone and subsequently crystallize in its voids (pores or cracks). The present article discusses the findings for four ornamental granites (gris alba, grissal, rosa porriño and rosavel) tested to European and Spanish standa…
Stone and other materials used for the construction of historic buildings, memorial statues, gravestones and similar are exposed to weathering and polluting agents and, therefore, progressive decay. Such deterioration, whether physical, chemical or biological, involves mineral phases and their interrelationships (stru…
The resistance of dolomitic limestone to salt crystallization processes was studied on materials from Redueña and Torrelaguna in the province of Madrid, Spain. Much of the region’s architectural and monumental heritage was built with the materials from these two sites. Stone specimens were selected for testing on the…
The article gives the analysis of possible criteria of application when accounting vibratory parameters mobile agricultural machines optimization. The example is given.
A quantum chemical study of the structure and stability of such antifreeze components as water and glycol has been undertaken using ab initio method in DZV basis. It is shown, that if ratio of water and glycol is optimal, decreasing of temperature leads to self-organization in the molecular level and structuring of wa…
Outcomes examinations with an estimation effect of damp on the basic indexes of process separation grain lots in the pneumocanal of the machine prestress clearing (MPS) of a grain material are reduced.
The study of the karbotitanosianirovanie process in multycompounds melt salts, in radio-frequency electromagnetic field was considered. At was shown the possibility of checking of "diligences" melt salts by means of acoustic emission experimental method.
In work results of theoretical calculation of basic elements of the closed technological package for coating composite coverings are brought.
The problem of finding maximal flow in networks with barrier reachability is considered. It is shown that existing algorithm for solution this problem can't find solution for all networks. New algorithm is suggested.
The fracture toughness of a glassy polycyclo-olefin (PCO) was investigated by the essential work of fracture (EWF) method using a double-edge notched specimens. It was shown that the PCO follows the EWF concept in the temperature range between room temperature and glass transition temperature Tg where the ligament yie…
Hybrid poly(ether-urethane)acrylate (PEUA)/titania (TiO2) microcomposites were prepared using a novel method that includes a swelling of different photo-crosslinked PEUA networks in concentrated tetraisopropoxytitanate (Ti(OiC3H7)4 or TIPT) precursor solution in organic media followed by the hydrolysis of covalently b…
A series of main-chain chiral polyketones have been synthesized through condensation polymerization of a dihalide and a diketone with optically pure binaphthyl moiety as linkage in the polymer backbone. The solubility of the polymers can be easily enhanced by substituents at the alpha position next to the carbonyl gro…