The influence of the microstructure and porous architecture of cellular concretes on their thermophysical properties has been analysed. It has been demonstrated that the thermal conductivity of the material is primarily determined by the volumetric fraction of cement paste, the size and shape of pores, as well as the density and moisture content of the specimens.
In this study, D-limonene is integrated into films made with different ratios of gelatin to β-CD. The FTIR, vacuum liquid absorption method and gravimetric analysis were used to assess porosity and swelling behavior. Inclusion and retention were detected by FTIR analysis in distinctive peaks at 870–890 cm-1. Films with a 3:1 gelatin to β-CD ratio had a higher D-limonene payload. Porosity and swelling are enhanced with increasing β-CD content.
The purpose of this work is to justify the feasibility of using the technology of microplasma sputtering from wire materials to obtain porous coatings for biomedical purposes, the modulus of elasticity of which is close to the corresponding characteristic of human cortical bone tissue. Analyzed the influence of the technological parameters of the microplasma sputtering regime on the degree of porosity of the coating.
The work describes a method of modifying the ceramic materials by introducing carbon-based nanoscopic additives into the slip composite and glaze composite in the form of water-based suspension for the production of sanitary and technical ceramics of increased quality. Physical and mechanical properties of experimental samples are researched. The results of experimental research are obtained in the form of experimentally determined properties of composite materials which were nanomodified by carbon nanostructures.
In this work, a mathematical model is developed for simulating the behavior of a counter-current moving bed reactor, in which the reduction of porous iron ore pellets to sponge iron is simulated. Simultaneous mass and energy balances within both the solid particles and the reactor, will lead to a set of coupled ordinary differential equations. The iron ore reduction kinetics was modeled with a single particle model. The model was able to satisfactorily reproduce the data of Gilmore Steel Corporation (USA).
Result of investigations of resistance against corrosion and mechanical resistance of obtained by means of arc-spray metallization (with the use of cored wires) coatings are presented. The cored wires (CWs) enable us to regulate the chemical composition and, consequently, properties of the deposited coating in a wide range.
The influence of the process of mechanical activation on the properties of fly ash was shown. The effect of ultrafine fly ash and chemical admixtures of polyfunctional action on the properties of fine grained concrete was investigated. It was observed that combination of such complex chemical admixtures and ultrafine fly ash provides the reaching of technical, technological and economical effects in High Performance Concretes.
The article is devoted to the preparation of adsorbents for polymer adsorption on their surface. Adsorption of polymers on the surface of adsorbents from a solution has been widely developed and received a great deal of attention in research works, which prove the topicality of its use in development of new composite materials and solve many problems concerning the polymers characteristics and properties. The adsorbents drawbacks, i.e. small specific surface area, diameter of the primary pores and their amounthave been determined.
Theoretical and experimental investigations of porous permeable materials of saponite-titanium and saponite-aluminium composites are presented in this work. their qualitative and quantitative indexes are determined in PhotoM and Smart-eye applied programs. Metallographic images are presented by combination of structural components with different proportions: phases, shape and color, grain boundaries.
A calculation of the empirical relationships that link the volumetric compression, porosity and pressure in porous rocks of an arbitrary geological region is suggested. The calculation of correlations and empirical relationships between reservoir properties and parameters of elastic waves is conducted by the data of Zaluszany’s wells, which distinguish dry and oil-gas saturated rocks. A detection of oil and water by the density parameter is proposed. A unified algorithm for these calculations is built.