Author
Igor Medved
Other affiliations: Slovak University of Technology in Bratislava, Texas Christian University, University of Constantine the Philosopher
Bio: Igor Medved is an academic researcher from Czech Technical University in Prague. The author has contributed to research in topics: Heat capacity & Phase transition. The author has an hindex of 9, co-authored 40 publications receiving 341 citations. Previous affiliations of Igor Medved include Slovak University of Technology in Bratislava & Texas Christian University.
Papers published on a yearly basis
Papers
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TL;DR: In this article, an energy-efficient thermal treatment of sewage sludge is proposed, aimed at its use in blended cements, and the results of chemical tests show that the safe limit for the practical use of sludge as partial Portland cement replacement is 10%, which is mainly due to the relatively high content of chlorides and alkalis.
101 citations
TL;DR: In this paper, an experimental and theoretical analysis of the water vapor adsorption in several types of porous building materials is presented, where the experimental data is analyzed using theoretical formulas based on the BET, BSB, BDDT, and FHH isotherms.
Abstract: An experimental and theoretical analysis of the water vapor adsorption in several types of porous building materials is presented. For the measurement of adsorption isotherms, a DVS-Advantage water sorption device is used. The experimental data is analyzed using theoretical formulas based on the BET, BSB, BDDT, and FHH isotherms, assuming a mono as well as multi-layer water vapor adsorption. The BSB equation is found to provide a good approximation for the relative humidities below 0.6–0.7, whereas the FHH equation shows a sufficient accuracy for the relative humidities above 0.4–0.5. Based on a combination of BSB and FHH isotherms, a semi-empirical formula is proposed that allows one to obtain a very accurate approximation of experimental data for all analyzed materials and all values of the relative humidity.
81 citations
TL;DR: A concise review of recent theoretical and experimental studies of osmotic phenomena in porous materials is provided in this article, where macroscopic models are presented and the determination of the involved transport coefficients is described.
46 citations
TL;DR: In this paper , a review of the research status, gaps, challenges and solutions of the use of waste byproducts of various sectors in lightweight concrete (LWC) is presented.
38 citations
TL;DR: In this article, three phase-change materials (PCMs) in which a change between two phases may be used to store/release thermal energy were measured in a quasistatic regime by adiabatic scanning calorimetry and showed, within a certain temperature range, a single distinct jump and peak.
32 citations
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TL;DR: There is, I think, something ethereal about i —the square root of minus one, which seems an odd beast at that time—an intruder hovering on the edge of reality.
Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.
Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …
33,785 citations
TL;DR: In this article, an assessment of the leading disposal (volume reduction) and energy recovery routes such as anaerobic digestion, incineration, pyrolysis, gasification and enhanced digestion using microbial fuel cell along with their comparative evaluation, to measure their suitability for different sludge compositions and resources availability.
463 citations
TL;DR: The authors summarizes the current state of practice with regard to the use of waste products as supplementary cementitious materials (SCM) in portland cement concrete (PCC) and provides a summary of the comparatively sparse information on underutilized waste materials such as: sugarcane bagasse ash, rice husk ash, waste wood biomass ash, and waste glass.
331 citations
TL;DR: In this paper, the authors present the measurements of complete sets of heat and moisture transport and storage parameters of selected thermal insulation materials in dependence on moisture content, such as hydrophobic mineral wool and expanded polystyrene.
220 citations
California Institute of Technology1, University of Cambridge2, Spanish National Research Council3, University of Glasgow4, Université libre de Bruxelles5, Basque Center for Applied Mathematics6, Newcastle University7, Birkbeck, University of London8, University of Alaska Anchorage9, Saginaw Valley State University10, Florida State University11, Royal Dutch Shell12, Osaka Ohtani University13, Loughborough University14
TL;DR: Chemical gardens in laboratory chemistries ranging from silicates to polyoxometalates, in applications ranging from corrosion products to the hydration of Portland cement, and in natural settings ranging from hydrothermal vents in the ocean depths to brinicles beneath sea ice.
Abstract: Chemical gardens in laboratory chemistries ranging from silicates to polyoxometalates, in applications ranging from corrosion products to the hydration of Portland cement, and in natural settings ranging from hydrothermal vents in the ocean depths to brinicles beneath sea ice. In many chemical-garden experiments, the structure forms as a solid seed of a soluble ionic compound dissolves in a solution containing another reactive ion. In general any alkali silicate solution can be used due to their high solubility at high pH. The cation should not precipitate with the counterion of the metal salt used as seed. A main property of seed chemical-garden experiments is that initially, when the fluid is not moving under buoyancy or osmosis, the delivery of the inner reactant is diffusion controlled. Another experimental technique that isolates one aspect of chemical-garden formation is to produce precipitation membranes between different aqueous solutions by introducing the two solutions on either side of an inert carrier matrix. Chemical gardens may be grown upon injection of solutions into a so-called Hele-Shaw cell, a quasi-two-dimensional reactor consisting in two parallel plates separated by a small gap.
200 citations