Ljubljana Passenger Transport

This work addresses the interpolation of probability measures within a spatial statistics framework. We develop a Kriging approach in the Wasserstein space, leveraging the quantile function representation of the one-dimensional Wasserstein distance. To mitigate the inaccuracies in semivariogram estimation that arise from sparse datasets, we combine this formulation with cross-validation techniques. In particular, we introduce a variant of the virtual cross-validation formulas tailored to quantile functions. The effectiveness of the proposed method is demonstrated on a controlled toy problem as well as on a real-world application from nuclear safety.

We investigate rigidity phenomena in one-dimensional point processes. We show that the existence of an $L^1$ transport map from a stationary lattice or the Lebesgue measure to a point process is sufficient to guarantee the properties of Number-Rigidity and Cyclic-Factor. We then apply this result to non-singular Riesz gases with parameter $s\in(-2,-1]$, defined in infinite volume as accumulation points of stationarized finite-volume Riesz gases. This includes, for $s=-1$, the well-known one-dimensional Coulomb gas (also called Jellium plasma, or the one-component 1D plasma).

BackgroundIn 2022, nearly 20 million new cancer cases and 9.7 million deaths occurred globally. Europe, comprising under 10% of the world’s population, accounted for over 22% of cases and 20% of deaths, reflecting an aging population, lifestyle risk factors, and extensive screening. With 40% of cancers preventable through modifiable risk factor interventions, effective prevention is essential. The European Code Against Cancer provides evidence-based guidelines that drive health initiatives across Europe. Supported by Europe’s Beating Cancer Plan and the EU4Health program, the EU Mobile App for Cancer Prevention was developed to disseminate these recommendations. However, its effectiveness depends on usability across populations with varying digital and health literacy; this study evaluates the app’s usability among diverse European populations.ObjectiveThis study aimed to identify enablers, barriers, and user requirements for the use and maintenance of the English version of the EU Mobile App for Cancer Prevention, focusing on how usability varied across individuals with different levels of digital health literacy and diverse sociodemographic backgrounds. In addition, user feedback on mock wireframes—visual representations of the app’s interface and functionality—was gathered to evaluate usability and ease of use, providing insights for tailoring the app design to a broader population.MethodsWe conducted a mixed methods study in 7 European countries with 76 adults aged 19‐84 years recruited via purposive quota sampling. Participants completed quantitative usability testing using mock wireframes to perform 10 predefined tasks simulating core app functionalities (eg, profile setup and health goal tracking). We recorded task completion time, success rates, self-reported confidence, and perceived difficulty. Digital health literacy was assessed using the eHealth Literacy Scale (eHEALS) scale. Qualitative data were collected through focus group discussions guided by a semistructured interview guide, and transcripts were analyzed via thematic content analysis. Statistical analyses included descriptive statistics and 1-way ANOVA to explore group differences.ResultsOverall task completion rates ranged from 75% to 98%, with a median of 86%, indicating general usability. However, usability varied by age, education, and digital health literacy: younger participants and those with higher education and literacy levels reported greater confidence and lower difficulty, whereas older adults and lower-literacy users experienced more challenges. Qualitative analysis identified key themes affecting usability: the need for accessibility (multilingual support and simple language), user-centric design (age-friendly interfaces and intuitive navigation), ethical concerns (data privacy and security), and motivational features (gamification and personalized health goals).ConclusionThe app is generally usable across diverse populations but requires streamlined interfaces and design adaptations to accommodate varying digital health literacy. Ensuring robust data privacy practices is essential for fostering user trust, and integrating motivational elements may enhance sustained engagement. Future work will involve piloting the finalized app to evaluate its real-world uptake and impact on cancer prevention behaviors.

Slovenia has eleven municipal harbors in Izola, Portorož and Koper, with 1442 berths for various types of pleasure boats on the northern Adriatic coast, which is only 47 kilometers long. However, there are not enough public berths for small boats. Some existing ports do not adhere to the guidelines for marina design, resulting in unconventional port infrastructure, mooring systems, and unused port water areas. There is a need to conduct marine studies for existing and new marinas following the Small Craft Berthing Facilities unified criteria of the US Department of Defense and PIANC Guidelines for Marina Design along with reviewing available standards for floating dock designs. Better planning and adherence to the guidelines will result in adequate maneuvering space for boats, appropriate size and type of pontoons, power, water and sanitary facilities in the marina, parking for boat owners and a docking area for boat maintenance with a sewage treatment system for cleaning dirty boat hulls. Safe mooring systems must be in place, considering the boats’ size and the marina’s location concerning wind, waves, currents, and tides. The logical arrangement of berths following the harbor planning guidelines will positively impact the use of the harbor as it will provide more berths for boats and more security, especially given the changing climate in which tides are rising and sudden storms are becoming more frequent and violent.

Relaxations of localized over-density in a plane transverse to the magnetic field are numericallyinvestigated under the effect of drift-wave and interchange drives in SOL conditions. Such a controlleddeparture from thermodynamic equilibrium allows the investigation of fundamental processesat play in cross-field transport. Interchange instabilities generate ballistic outward radial flux withlow amplitude zonal flow patterns, whereas drift-wave instabilities result in symmetric radial fluxwith large amplitude zonal flow patterns. When both instabilities are considered, the combinedeffects tend to favor drift-waves, leading to a weaker outward flux with larger zonal flow patterns.

We study the average $p-$Wasserstein distance between a finite sample of an infinite hyperuniform point process on $\mathbb{R}^2$ and its mean for any $p\geq 1$. The average Wasserstein transport cost is shown to be bounded from above and from below by some multiples of the number of points. More generally, we give a control on the $p-$Wasserstein distance in function of a control on the $L^p$ norm of the difference of the point process and its mean. We also obtain the $d$-dimensional version of this result.

This article proposes a hybrid technological scheme for dewatering the digestate of wastewater from the food industry, further cleaning the obtained filtrate after dehydration with the possibility of returning it to the technological chain for reuse. At least ten different derivative products can be obtained from digestate, including liquid/solid fraction, granules obtained from both solid and liquid fractions, and analogues of commercial synthetic fertilisers: ammonium sulphate, ammonia water, magnesium ammonium phosphate (struvite). The purpose of the experimental studies was to choose an appropriate process for treating digestate of food production wastewater to solve the problem of increasing the amount of sediment and the formation of digestate. The investigated digestate treatment processes include the next: chemical conditioning (dosing of flocculants and coagulants), mechanical dewatering using multi-disc technology (with ESMIL MDQ multi-disc screw press), two stages of membrane separation (using reverse osmosis (RO) membranes, vibrating shear process (VSEP), zwitterionic (ZI) membrane). The cake separated after the dehydration stage can be processed in bulk or pallets with 10–35% dry matter content and used as fertiliser. Due to the high viscosity of the initial digestate, the technological scheme provides for its dilution before the dehydration stage. Dilution occurs with the purified filtrate after the membrane purification stage. The effectiveness of dehydration on cake dryness showed worse results than expected but deserves further investigation if this parameter is significant. Using an additional stage of filtrate purification on RO membranes is efficient and appropriate if high-quality purified water is required. The cleaning process can be stopped at any stage, depending on the cleaning needs. The obtained results regarding the efficiency of the cleaning process after RO membranes showed the following values for the main pollutants: COD – 98.43%, ammonium nitrogen – 99.35%, and phosphates – 99.99%. Keywords: digestate, sludge conditioning, coagulant, flocculent, dehydration, membrane purification, cake, permeate.

Naslov učbenika v dveh knjigah, Trdnost I in Trdnost II, je posnet po naslovu predmeta Trdnost na univerzitetnem študiju gradbeništva na Fakulteti za gradbeništvo in geodezijo Univerze v Ljubljani. Predmet je nastal po uvedbi bolonjskega študijskega programa z združitvijo in občutnim zmanjšanjem skupnega obsega dotedanjih predmetov Mehanika trdnih teles in Trdnost. Prvi del učbenika je tako v celoti posvečen vsebinam, ki jih sicer v tehniški literaturi srečamo pod imeni Mehanika trdnih teles, Mehanika kontinuuma, Mehanika materialov in podobno. Šele v drugem delu se dotaknemo vsebin, ki bi jih pogojno lahko označili kot probleme trdnosti elementov konstrukcij in metod za njihovo matematično obravnavo.