University of Maribor

About: University of Maribor is a education organization based out in Maribor, Slovenia. It is known for research contribution in the topics: Population & KEKB. The organization has 3987 authors who have published 13077 publications receiving 258339 citations. The organization is also known as: Univerza v Mariboru.

The influence of external factors on routine ERP usage

Abstract: Purpose – Enterprise resource planning (ERP) systems have been implemented in most organizations for a few years. ERP solutions go through three phases of lifecycle: selection, implementation and operation phase; the operation phase consists of the stabilization stage and the routine stage. To improve the efficiency and effectiveness of ERP system use in the operation phase, organizations need to research the factors that have impact on users' satisfaction. A literature shows that few published studies have examined users' adoption of ERP systems through a technological acceptance model (TAM) or examined external factors that have influence the intention to use an ERP system, or ERP use in the stabilization stage. The purpose of this paper is to expose and research external factors which have influence on ERP users in the operation phase of ERP lifecycle and to investigate the impact of those factors on ERP system use.Design/methodology/approach – The TAM proposed by Davis has been the most widely‐used mo...

Test of lepton flavor universality and search for lepton flavor violation in B → Kℓℓ decays

Abstract: We present measurements of the branching fractions for the decays B → Kμ+μ− and B → Ke+e−, and their ratio (RK), using a data sample of 711 fb−1 that contains 772 × 106 $$ B\overline{B} $$ events. The data were collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. The ratio RK is measured in five bins of dilepton invariant-mass-squared (q2): q2 ∈ (0.1, 4.0), (4.00, 8.12), (1.0, 6.0), (10.2, 12.8) and (> 14.18) GeV2/c4, along with the whole q2 region. The RK value for q2 ∈ (1.0, 6.0) GeV2/c4 is $$ {1.03}_{-0.24}^{+0.28} $$ ± 0.01. The first and second uncertainties listed are statistical and systematic, respectively. All results for RK are consistent with Standard Model predictions. We also measure CP-averaged isospin asymmetries in the same q2 bins. The results are consistent with a null asymmetry, with the largest difference of 2.6 standard deviations occurring for the q2 ∈ (1.0, 6.0) GeV2/c4 bin in the mode with muon final states. The measured differential branching fractions, $$ d\mathrm{\mathcal{B}} $$ /dq2, are consistent with theoretical predictions for charged B decays, while the corresponding values are below the expectations for neutral B decays. We have also searched for lepton-flavor-violating B → Kμ±e∓ decays and set 90% confidence-level upper limits on the branching fraction in the range of 10−8 for B+ → K+μ±e∓, and B0 → K0μ±e∓ modes.

On locally linearly dependent operators and derivations

Abstract: The first section of the paper deals with linear operators Ti : U −→ V , i = 1, . . . , n, where U and V are vector spaces over an infinite field, such that for every u ∈ U , the vectors T1u, . . . , Tnu are linearly dependent modulo a fixed finite dimensional subspace of V . In the second section, outer derivations of dense algebras of linear operators are discussed. The results of the first two sections of the paper are applied in the last section, where commuting pairs of continuous derivations d, g of a Banach algebra A such that (dg)(x) is quasi–nilpotent for every x ∈ A are characterized.

Supercritical impregnation as a feasible technique for entrapment of fat-soluble vitamins into alginate aerogels

Abstract: The use of supercritical fluids as solvents allows innovative processing applications that can overcome the limitations of organic solvents. Their suitable properties make them appropriate for applications in the pharmaceutical and food industries and even more as a tool for the entrapment of substances. The aim of the presented work was to entrap two substances: 2-methyl-1, 4-naphthquinone (vitamin K3) and cholecalciferol (vitamin D3) within alginate aerogels by using supercritical carbon-dioxide. Supercritical impregnation of aerogels is receiving increasing attention as a green technique for entrapping poorly water soluble substances. The entrapment of vitamin D3 is a huge challenge due to its very high sensitivity. Impregnation experiments were carried out at 150 and 200 bar and 40 °C. As the process was shown to be feasible for both vitamins, the adsorption isotherms were measured and fitted with the Langmuir model. The effects of pressure, vitamins' concentrations and the time of impregnation on the loaded aerogels were studied. The time of impregnation was shown to be the critical and more important parameter where the highest loadings were achieved after only 1 h of impregnation. The loaded aerogels were characterised using Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscopy. Furthermore, in-vitro dissolution testing for vitamin D3 was performed and the controlled release of the vitamin over a time span of 6 h was achieved.