1. Is the handgrip strength influential factor on the competition result in elite male artistic gymnasts?Miloš Paunović, Suzana Žilič Fišer, 2023, original scientific article Keywords: umetniška gimnastika, vpliv na rezultate, relativna moč, moč oprijema roke, splav, relative strength, handgrip strength, artistic gymnastics, result influence
Published in DKUM: 12.06.2024; Views: 106; Downloads: 8
 Full text (409,43 KB)
This document has many files! More... |
2. Development of the smart T-shirt for monitoring thermal status of athletesSandra Stojanović, Jelka Geršak, Suzana Uran, 2022, original scientific article Abstract: Athletes are often subjected to a great physical strain during training and competition. Sport activities performed in hot and humid conditions may result in different heat illnesses with mild or fatal consequences. Against this background it is important to know the thermal state of athletes during physical activity.
This article presents the development of a smart T-shirt for monitoring the thermal status of an athlete. The smart T-shirt was created by embedding an electronic system with temperature and humidity sensors that allows the measurement of temperature and the relative humidity of the microclimate. A smart T-shirt is comfortable, and integrated sensors and electronics do not affect wearing comfort. A good concurrence between the temperature and humidity results from using the smart T-shirt, and thus the medical device was achieved. Data obtained can be of great importance to the sports staff who will be able to monitor the athletes' thermal state during matches and competitions.
Keywords: smart T-shirt, microclimate temperature, relative humidity of the microclimate
Published in DKUM: 26.03.2024; Views: 190; Downloads: 17
Full text (1,34 MB)
This document has many files! More... |
3. Coupling of nematic in-plane orientational ordering and equilibrium shapes of closed flexible nematic shellsLuka Mesarec, Wojciech Góźdź, Veronika Kralj-Iglič, Samo Kralj, Aleš Iglič, 2023, original scientific article Abstract: The impact of the intrinsic curvature of in-plane orientationally ordered curved flexible nematic molecules attached to closed 3D flexible shells was studied numerically. A Helfrich-Landau-de Gennes-type mesoscopic approach was adopted where the flexible shell’s curvature field and in-plane nematic field are coupled and concomitantly determined in the process of free energy minimisation. We demonstrate that this coupling has the potential to generate a rich diversity of qualitatively new shapes of closed 3D nematic shells and the corresponding specific in-plane orientational ordering textures, which strongly depend on the shell’s volume-to-surface area ratio, so far not predicted in mesoscopic-type numerical studies of 3D shapes of closed flexible nematic shells.
Keywords: orientational ordering, curved nematic molecules, flexible nematic shells, equilibrium shapes, relative volume
Published in DKUM: 25.03.2024; Views: 280; Downloads: 15
Full text (2,66 MB)
This document has many files! More... |
4. Shear modulus of a saturated granular soil derived from resonant-column testsH. Patiño, E. Martínez, Jesús González, A. Soriano, 2017, original scientific article Abstract: This paper presents the results of 120 determinations of the shear modulus (G) of a saturated granular soil (20–40 Ottawa sand) in different conditions of relative density (Dr), effective consolidation pressure (σ’ c) and level of torsional excitation (Te). The equipment used was a resonant-column apparatus manufactured by Wykeham Farrance and the tests were performed with relative density values of 20, 40, 60 and 80%, effective consolidation pressures of 50, 100, 150, 200, 250 and 300 kPa, and torsional excitations of 0.025, 0.05, 0.1, 0.2 and 0.4 volts (V), leading to shear strains (γ) between 0.002% and 0.023%. The results led to very simple empirical expressions for the shear modulus as a function of the angular strain for different effective consolidation pressures and void-ratio values.
Keywords: resonant column, resonant frequency, shear modulus, relative density, effective consolidation pressure, dynamic shear modulus
Published in DKUM: 18.06.2018; Views: 1315; Downloads: 86
Full text (1,31 MB)
This document has many files! More... |
5. Impact of curvature on nematic topological defectsLuka Mesarec, 2018, doctoral dissertation Abstract: Topological defects (TDs) appear almost unavoidably in continuous symmetry breaking phase transitions. The topological origin makes their key features independent of systems' microscopic details; therefore TDs display many universalities. Because of their strong impact on numerous material properties and their significant role in several technological applications it is of strong interest to find simple and robust mechanisms controlling the positioning and local number of TDs. There are strong evidences that in physics the fields are fundamental entities of nature and not particles. If this is the case then topological defects (TDs) might play the role of fundamental particles. An adequate testing ground to study and gain fundamental understanding of TDs are nematic liquid crystals. We present a numerical study of TDs within effectively two dimensional closed soft films exhibiting in-plane orientational ordering. Popular examples of such class of systems are liquid crystalline shells and various biological membranes.
We analyze the impact of extrinsic and intrinsic curvature on positions of topological defects (TDs) in two-dimensional (2D) nematic films. We demonstrate that both these curvature contributions are commonly present and are expected to be weighted by comparable elastic constants. A simple Landau-de Gennes approach in terms of tensor nematic order parameter is used to numerically demonstrate impact of the curvatures on position of TDs on 2D ellipsoidal nematic shells. We introduce the Effective Topological Charge Cancellation mechanism controlling localised positional assembling tendency of TDs and the formation of pairs (defect,antidefect) on curved surfaces. Furthermore, we estimate a critical depinning threshold to form pairs (defect,antidefect) using the electrostatic analogy. Finally, we show how one could efficiently switch among qualitatively different structures by using a relative volume of ordered shells, which represents a relatively simple naturally accessible control parameter.
In doctoral thesis, we developed theoretical model of erythrocyte membrane by using a hybrid Helfrich-Landau type mesoscopic approach, taking into account in-plane membrane ordering. We demonstrate that the derived extrinsic membrane energy term, which strongly depends on the local orientations of the molecules, is essential for the predicted broadening of the range of the relative volumes corresponding to the stable discocyte shapes, which is otherwise very narrow if only intrinsic curvature energy term dominates.
Keywords: Topological defects, Continuum fields, Nematic liquid crystals, Biological membranes, Nematic shells, Landau-de Gennes formalism, Topological charge, Nanoparticles, Gaussian curvature, Electrostatic analogy, Intrinsic curvature, Extrinsic curvature, Crystal growth nucleation, Relative
volume
Published in DKUM: 09.03.2018; Views: 2391; Downloads: 242
Full text (23,66 MB) |
6. Impact of salt reduction on the number of microorganisms and a sensory analysis for Kranjska sausages during their shelf-lifeLivija Tušar, Irena Leonida Kropf, Avrelija Cencič, 2016, original scientific article Abstract: Salt is an important ingredient in the production of meat product. Any reduction of salt requires a special treatment. This study was conducted to evaluate the effect of salt reduction on the growth of microorganisms in Kranjska sausages during their shell-life and to carry out a sensory assessment. The 18 lots of sausages were prepared under salt-reduced (1.6%) and control (2.3%) salt concentrations, directly on the production line. A total of 85 sausages were analysed and the data were used for the comparisons of groups (ANOVA) and to detect the significant variables (polynomial models) influenced on the total number of microorganisms (TNMs). The significant differences were determined between the lots (representing the microbiological status of the stuffing), between the salt-reduced samples and control samples, and between the different humidity levels. The correlations and significant relationships were determined between the TNMs and the lots, the salt concentrations, and the relative humidity. The polynomial models were to general to be used for the prediction. For sensory analysis implemented on 40th day 18 sausages were assessed. The reduction of salt resulted in lower scores in the sensory evaluation. The less-salted sausages contained more microorganisms.
Keywords: Kranjska sausage, reduction of salt, sensory evaluation, models, relative humidity
Published in DKUM: 14.11.2017; Views: 1566; Downloads: 396
Full text (815,34 KB)
This document has many files! More... |
7. Measuring wind resourcesDalibor Igrec, Amor Chowdhury, Miralem Hadžiselimović, Bojan Štumberger, 2011, original scientific article Keywords: wind resources, wind turbine, wind speed, wind direction, air temperature, relative humidity, anemometer, wind wane
Published in DKUM: 05.06.2012; Views: 3022; Downloads: 73
 Link to full text |
