71 research outputs found
Sodium alginate conversion into char via pyrolysis at the onset temperature
No full textPyrolysis is the simplest method to convert bio-based materials into carbonaceous chars. In this study, Na alginate (an aquatic-derived substance isolated from brown algae) is thermally treated under very mild condition (onset temperature). The effectiveness of the conversion has been determined via physicochemical characterizations, showing the possibility of modifying the (bio)polymeric chemical structure just at the beginning of its thermal degradation, guaranteeing an overall energetic beneficial effect
Improving rubber concrete strength and toughness by plasma-induced end-of-life tire rubber surface modification
No full textThis study evaluates the effectiveness of using different plasma treatments to favor the compatibility between rubber and a cement matrix in composites,
thus leading to a different surface reactivity of the rubber component. Plasmatreated rubbers were introduced into two d ifferent types of concr ete.
Mechanical tests highlighted that Portland concrete composites filled with N2/H2 plasmatreated rubber had increased flexural strength, toughness, and
compression strength compared to composites containing untreated rubber. A scaling law is also proposed to qualitatively discriminate between
related effects due to topological/roughness or intrinsic/chemical adhesion modifications. Plasma treatment can improve both intrinsic adhesion
and roughness of the rubber–cement interface and thus the overall concrete strength and toughness
A Step Toward Control of the Surface Structure of Biomimetic Hydroxyapatite Nanoparticles: Effect of Carboxylates on the {010} P-rich/Ca-rich Facets Ratio
No full textRole of citrate in the formation of enamel-like calcium phosphate oriented nanorod arrays
No full textOn the surface effects of citrates on nano-apatites: evidence of a decreased hydrophilicity
No full textTo the question of action on the rods lying on elastic foundation, inertial load with a variable speed of its movement
No full textA method for calculating the rods on elastic foundation under the inertial load action when it moves at a variable speed is proposed. Test problems about a force or load movement with variable speeds along a hinged beam and about the movement with a high-speed railway car deceleration along a track section modeled by a hinged supported beam of great length on an elastic foundation are considered. The selection of the elastic foundation material of the rail track determines the dynamics of the high-speed railway car in different modes of its movement. To construct the methodology, the previously proposed by the author of the article solutions are used: a step-by-step procedure for solving the problems of unsteady dynamics of structures and the method of “nodal accelerations” to take into account the action on structures of a moving inertial load
Effect of Silica Surface Properties on the Formation of Multilayer or Sub-monolayer Protein Hard Corona: Albumin Adsorption on Pyrolytic and Colloidal SiO2 Nanoparticles
No full textInformatization of higher school: socially-information determinants and development trends
No full textThe paper deals with some specific aspects of the formation of modern socially-informationspace. It also suggests the lines of development of informatization processes in higher school in the medium term. The author introduces his conception of modern higher school ecosystem,built with a number of role models (educational, competence, resource, information, investment, innovation and service)
MOBILE TECHNOLOGIES MANAGEMENT IN THE INFORMATION SPACE OF MODERN INSTITUTE OF HIGHER EDUCATION
No full textThe paper deals with the prerequisites of application of mobile technologies in institutions of higher education taking into consideration Russian specifics. The author suggeststhe construction of the university informatization strategy, based on using mobile devices; discusses the approaches to mobile devices management in the information space of the university; offers mobile data services to support a variety of organizational and educational processes
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