Electrical-percolation effects in epoxy resin/ion-exchange resin/polyaniline anticorrosion composite materials

A new type of epoxy–polyelectrolyte anticorrosion protective material based on epoxy resin, ion-exchange resin, and polyaniline has been studied. Electrical-percolation transitions are observed after submerging stainless-steel plates coated with epoxy–polyelectrolyte compositions in a solution of NaCl. Conductivity data processed within a percolation model show that the modification of ion-exchange resin by polyaniline strongly influences the coating model parameters owing to changes in physicochemical and morphological properties of ion-exchange resin. It is established that the electrochemical response to the action of an aqueous salt solution can be controlled by variation of the material composition.     

A DSL for specifying run-time adaptations for embedded systems: an application to vehicle stereo navigation

The traditional approach for specifying adaptive behavior in embedded applications requires developers to engage in error-prone programming tasks. This results in long design cycles and in the inherent inability to explore and evaluate a wide variety of alternative adaptation behaviors, critical for systems exposed to dynamic operational and situational environments. In this paper, we introduce a domain-specific language (DSL) for specifying and implementing run-time adaptable application behavior. We illustrate our approach using a real-life stereo navigation application as a case study, highlighting the impact and benefits of dynamically adapting algorithm parameters. The experiments reveal our approach effective, as such run-time adaptations are easily specified in a higher level by the DSL, and thus at a lower programming effort than when using a general-purpose language such as C.     

Modelling Acoustic–Electric Nondestructive Testing for Defects in Dielectric Materials

Russian Journal of Nondestructive Testing - The influence of defectiveness of solid-state dielectric samples on the parameters of the electromagnetic response under deterministic acoustic action on...     

Analysis of pure nonferrous and rare metals by atomic emission spectroscopy with photodiode detection

Analytic possibilities of direct determination of impurities in pure nonferrous and rare metals (Ga, In, Cd, Al, Cu, Ni, and Sn) by the arc atomic emission method with application of multichannel atomic emission spectroscopy are studied. The conditions for the performance of the analysis are established. The limits of detection and determination of impurities in studied materials are estimated. The possibility to determine elements at a level of 10^?4?C10^?5 wt % is demonstrated. The accuracy is checked by comparing the obtained results with values of the determined impurities proved by use of state standard reference samples or departmental standard specimens. Improved techniques of arc atomic emission analysis of high purity nonferrous and rare metals are developed. The techniques possess amended metrological characteristics and permit one to considerably reduce the time of carrying out the analysis.     

Processing of sphagnum moss to produce carbon nanotubes

Attention focuses on the processing of sphagnum moss and the sequence by which multiwalled carbon nanotubes are formed in the mechanical activation of amorphous carbon. Nanotube formation occurs within a mass of carbon particles.     

Analysis of zinc coatings on the basis of the iron-zinc phase diagram

The structure of zinc coatings is studied on the basis of the iron-zinc phase diagram, and the coating properties are compared. Corrosion tests indicate that diffusional zinc coatings are preferable in challenging operating conditions. Their structure consists mainly of intermetallides (iron-zinc phases) whose corrosion resistance is greater than that of pure zinc, primarily on account of passivation by zinc ferrites (ZnFeO₂, ZnFe₂O₄), as well as ZnO. The coating life in various aggressive media is considered, together with the main applications of zinc coatings.     

Road bitumen's based on the vacuum residue of heavy oil and natural asphaltite: Part I – chemical composition

This work is devoted to studying the possibility of producing bitumen for road construction by using vacuum residue >420°C of heavy oil of the Ashal'chinskoe field in and natural asphaltite Spiridonovskoe field from Permian deposits in Tatarstan. The effect of natural asphaltite as a solid disperse phase element on the structural and group composition of the residual heavy oil product and its malacometrical qualities (penetration, extensibility, softening point, resistance to aging and adhesion) is revealed. The production of samples of compounded bitumen production was carried out by introducing the required amount of the shredded asphaltite to deasphaltizat vacuum residue of heavy oil and heating their mixture to 220°С with vigorous stirring. Changes in the composition and physical and chemical properties of deasphalting the residual heavy oil product, associated with the amount of injected asphaltite, showed the possibility of production of modified bitumen with better adhesion properties that correspond to road bitumen.     

Tuning catalytic performances of cobalt catalysts for clean hydrogen generation via variation of the type of carbon support and catalyst post-treatment temperature

Multi-walled carbon nanotubes, three types of activated carbons, single wall carbon nanotube and reduced graphene oxides were used to synthesize nano-sized Co catalysts for H₂ preparation via NH₃ decomposition. Catalyst samples were characterized by number of techniques such as N₂ physisorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopes (XPS), Transmission electron microscopy (TEM), CO chemisorption, temperature-programmed reduction (H₂-TPR) and temperature-programmed desorption (N₂-TPD). The catalytic activities of the studied catalysts for H₂ production via NH₃ decomposition were measured in a fixed-bed micro-reactor. Co catalyst supported on multi-wall carbon nanotubes has shown the highest catalytic activity. The Co particles size was significantly affected by the variation of the post-treatment temperature. The Co particles size in the range of 4.7–64.8 nm can be effectively controlled by varying post-treatment temperature between 230 and 700 °C. The maximum TOF of NH₃ decomposition was registered on cobalt catalyst post-treated at 600 °C.