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118 results on '"Gaberscek, M."'

17. Nonlinear diffusion in two-dimensional ordered porous media based on a free volume theory.

Author

Godec, A., Gaberscek, M., Jamnik, J., and Merzel, F.

Subjects
*BURGERS' equation, *POROUS materials, *VAN der Waals forces, *NEUMANN problem, *SILICATES spectra, *HEAT equation
Abstract

A continuum nonlinear diffusion model is developed to describe molecular transport in ordered porous media. An existing generic van der Waals equation of state based free volume theory of binary diffusion coefficients is modified and introduced into the two-dimensional diffusion equation. The resulting diffusion equation is solved numerically with the alternating-direction fully implicit method under Neumann boundary conditions. Two types of pore structure symmetries are considered, hexagonal and cubic. The former is modeled as parallel channels while in case of the latter equal-sized channels are placed perpendicularly thus creating an interconnected network. First, general features of transport in both systems are explored, followed by the analysis of the impact of molecular properties on diffusion inside and out of the porous matrix. The influence of pore size on the diffusion-controlled release kinetics is assessed and the findings used to comment recent experimental studies of drug release profiles from ordered mesoporous silicates. [ABSTRACT FROM AUTHOR]

Published
2009
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20. Detailed In-situ Investigation of the Electrochemical Processes in $Li_2FeTiO_4$ Chatodes

Author

Kuezma, M., Dominko, R., Hanzel, D., Kodre, A., Arcon, I., Meden, A., and Gaberscek, M.

Subjects
Adult, Male, Adolescent, rufinamide, therapeutic use [Triazoles], drug therapy [Epilepsy], Triazoles, therapeutic use [Anticonvulsants], methods [Drug Therapy, Combination], Young Adult, Treatment Outcome, Double-Blind Method, Child, Preschool, ddc:540, Drug Evaluation, Humans, Female, Anticonvulsants, Longitudinal Studies, Child
Abstract

This open-label extension evaluated the long-term efficacy and tolerability of rufinamide in patients with Lennox-Gastaut syndrome (LGS) who had previously completed a 12-week double-blind study.In total, 124 patients (aged 4-37 years), receiving 1-3 concomitant antiepileptic drugs, were treated with rufinamide approximately 25-60 mg/kg/day. Efficacy was assessed by seizure frequency; tolerability by adverse events (AEs) and laboratory tests.Overall, patients were treated with rufinamide for a median (range) of 432 (10-1149) days. Reductions in seizure frequency were observed throughout the study; during the last 12 months of treatment, 41.0% and 47.9% of patients had > or = 50% reduction in total and tonic-atonic seizure frequency, respectively. The most common AEs were vomiting (30.6%) and pyrexia (25.8%).In this open-label extension, rufinamide appeared to be an effective long-term adjunctive therapy for the treatment of LGS-associated seizures in children and young adults.

Published
2009

22. Unusual Magnetic State in Lithium-DopedMoS2Nanotubes

Author

Maja Remškar, Gaberscek M, Dragan Mihailovic, José M. Martínez-Agudo, Eugenio Coronado, Dominko R, Zvonko Jagličić, Carlos J. Gómez-García, Ales Mrzel, Denis Arčon, Viktor V. Kabanov, and Andrej Zorko

Subjects
Materials science, Condensed matter physics, Orders of magnitude (temperature), General Physics and Astronomy, chemistry.chemical_element, Electron, Instability, Magnetic susceptibility, symbols.namesake, Paramagnetism, Pauli exclusion principle, chemistry, Quantum critical point, symbols, Lithium
Abstract

We report on the very peculiar magnetic properties of an ensemble of very weakly coupled lithium-doped MoS2 nanotubes. The magnetic susceptibility chi of the system is nearly 3 orders of magnitude greater than in typical Pauli metals, yet there is no evidence for any instability which would alleviate this highly frustrated state. Instead, the material exhibits peculiar paramagnetic stability down to very low temperatures, with no evidence of a quantum critical point as T-->0 in spite of clear evidence for strongly correlated electron behavior. The exceptionally weak intertube interactions appear to lead to a realization of a near-ideal one-dimensional state in which fluctuations prevent the system from reordering magnetically or structurally.

Published
2003

23. Li-S battery analyzed by UV/vis in operando mode

Author

Patel, M.U.M., Demir-Cakan, R., Morcrette, M., Tarascon, J.M., Gaberscek, M., Dominko, R., Patel, M.U.M., Demir-Cakan, R., Morcrette, M., Tarascon, J.M., Gaberscek, M., and Dominko, R.

Abstract

Battery watch: UV/Vis spectrophotometry is demonstrated as a powerful analytical method for the in situ study of polysulfides. Through the interactions that occur between different chain-length polysulfide molecules and the UV/Vis radiation, quantitative and qualitative determination of the polysulfides formed during Li-S battery operation can be achieved. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Published
2013

24. Analytical Techniques for Li-S Batteries

Author

Patel, M.U.M., Demir cakan, R., Morcrette, M., Tarascon, J.M., Gaberscek, M., Dominko, R., Patel, M.U.M., Demir cakan, R., Morcrette, M., Tarascon, J.M., Gaberscek, M., and Dominko, R.

Abstract

Lithium sulfur rechargeable batteries are foreseen to be used in electric vehicles in the near future. To enable their placement to the market we need to improve their reliability and cycling performance. This can be done by selective change of the chemical environment in the Li-S battery, including electrolyte (solvents and salts), different combinations of cathode composites and different additives. With an aim to understand differences between different chemical environments, suitable and reliable analytical techniques that can effectively monitor the changes of interest, should be developed. In this work we present two newly developed analytical techniques which are capable to detect quantitative and qualitative differences between different polysulfide species in the electrolyte. More specifically, both proposed techniques can detect the polysulfides that have diffused away from the cathode composite. With a modified 4-electrode Swagelok cell we can quantitatively determine the amount of such polysulfides, while an in-situ UV-Vis cell gives us information about the composition of these polysulfides. Combining these techniques with a classical galvanostatic cycling method could lead to a better understanding, consequently, a faster tuning of Li-S battery properties.

Published
2013

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