Iskanje po katalogu digitalne knjižnice

Ključne besede: quantifying power system frequency quality, statistical indices, pattern extracting, machine learning, short time scales, renewable energy sources
Objavljeno v DKUM: 23.08.2024; Ogledov: 50; Prenosov: 4
Celotno besedilo (12,67 MB)

Opis: Swarmalators are entities with the simultaneous presence of swarming and synchronization that reveal emergent collective behavior due to the fascinating bidirectional interplay between phase and spatial dynamics. Although different coupling topologies have already been considered, here we introduce time-varying competitive phase interaction among swarmalators where the underlying connectivity for attractive and repulsive coupling varies depending on the vision (sensing) radius. Apart from investigating some fundamental properties like conservation of center of position and collision avoidance, we also scrutinize the cases of extreme limits of vision radius. The concurrence of attractive–repulsive competitive phase coupling allows the exploration of diverse asymptotic states, like static π, and mixed phase wave states, and we explore the feasible routes of those states through a detailed numerical analysis. In sole presence of attractive local coupling, we reveal the occurrence of static cluster synchronization where the number of clusters depends crucially on the initial distribution of positions and phases of each swarmalator. In addition, we analytically calculate the sufficient condition for the emergence of the static synchronization state. We further report the appearance of the static ring phase wave state and evaluate its radius theoretically. Finally, we validate our findings using Stuart–Landau oscillators to describe the phase dynamics of swarmalators subject to attractive local coupling.
Ključne besede: swarmalators, time-varying couplings, synchronization, competitive phase coupling
Objavljeno v DKUM: 16.07.2024; Ogledov: 87; Prenosov: 8
Celotno besedilo (3,26 MB)
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Opis: The COVID-19 pandemic has affected the outcomes of ST-elevation myocardial infarction (STEMI) patients in most countries. We aimed to retrospectively assess the admissions, treatments, complications, and mortality of STEMI patients in the northeast of Slovenia during the first (March–May 2020) and second waves (October–December 2020) of the COVID-19 pandemic and to compare them with data from 2019 (March–October). Comparing 2019 and both waves of the COVID-19 pandemic, we observed nonsignificant differences in the number of STEMI admissions, baseline characteristics, use of primary percutaneous coronary intervention (PCI) within the first 3 (40.5%* vs. 38.7% vs. 25%*, *p = 0.074) or 6 h, TIMI III flow after primary PCI, and hospital complications, as well as significant increases in hospital heart failure (23.3% vs. 42%, p = 0.015) and mitral regurgitation in the second wave (10% vs. 26.9%, p = 0.008) of the pandemic and a nonsignificant increase in hospital mortality (8.9% vs. 9.4% vs. 13.6%) during both waves of the pandemic. We conclude that, due to the increased severity of the COVID-19 pandemic in the second wave, there were longer delays to primary PCI in STEMI patients, resulting in significantly increased hospital heart failure and non-significantly increased hospital mortality.
Ključne besede: ST-elevation myocardial infarction, COVID-19, time delay, primary percutaneous coronary intervention, heart failure, mortality, pandemic
Objavljeno v DKUM: 04.07.2024; Ogledov: 134; Prenosov: 15
Celotno besedilo (1,04 MB)
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Opis: Objectives:This study was done to determine the timing of eruption of permanentteeth by sex and the number of permanent teeth erupted at different ages and toassess its association with malocclusion. Material and Methods:The sample for this study consisted of 633 healthy subjects(317 boys and 316 girls) aged between 5.0 and 15.0 years. The subjects were dividedinto subgroups considering an age interval of 1 year. Results:The mean eruption times were lower for girls compared with boys exceptfor the maxillary and mandibular second premolars and second molars, which werefound to erupt earlier in boys. All the permanent mandibular teeth, except thesecond premolars, tended to erupt earlier than their maxillary antagonists in bothsexes. The sequence of eruption differs between girls and boys in the maxillarycanine and maxillary second premolars. In Class III malocclusion, all the permanentmandibular teeth erupt earlier than their maxillary antagonists. In the entire sample,the correlation between the number of erupted teeth and age was strong (p< .05),but the differences between sexes were not significant. Conclusions:It is important to know the normal eruption time of permanent teeth inthe population due to diagnosis and better treatment planning in pediatric dentistryand orthodontics.
Ključne besede: eruption time, malocclusion, pediatric dentistry
Objavljeno v DKUM: 11.06.2024; Ogledov: 125; Prenosov: 5
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Opis: Background: Our aim was to determine whether child attachment to parents, parent attachment style, and morning cortisol levels were related to diabetes outcomes measured by average glycated hemoglobin (HbA1c), HbA1c variability over 4 years and time in range (TIR) in children with type 1 diabetes (T1D). Research design and methods: 101 children with T1D and one of their parents were assessed at baseline for child attachment (Child Attachment Interview; CAI) and parent attachment (Relationship Structures Questionnaire; ECR-RS). Serum samples were collected for cortisol measurements before the interviews. HbA1c levels were measured during a 4-year follow-up period at regular 3-monthly visits, and data for TIR were exported from blood glucose measuring devices. Multivariate linear regression models were constructed to identify independent predictors of glycemic outcomes. Results: More girls than boys exhibited secure attachment to their mothers. The results of the regression models showed that securely attached girls (CAI) had higher average HbA1c than did insecurely attached girls (B = -0.64, p = 0.03). In boys, the more insecure the parent's attachment style, the worse the child's glycemic outcome: the higher the average Hb1Ac (B = 0.51, p = 0.005), the higher the HbA1c variability (B = 0.017, p = 0.011), and the lower the TIR (B = -8.543, p = 0.002). Conclusions: Attachment in close relationships is associated with glycemic outcomes in children with T1D, and we observed significant differences between sexes. A sex- and attachment-specific approach is recommended when treating children with less favorable glycemic outcomes. Special attention and tailored support should be offered to securely attached girls in transferring responsibility for diabetes care and at least to male children of insecurely attached parents to prevent suboptimal glycemic control. Further studies in larger samples and more daily cortisol measurements may help us better understand the links between stress response, attachment and T1D.
Ključne besede: attachment, childhood and adolescence, cortisol, diabetes control, time in range
Objavljeno v DKUM: 21.05.2024; Ogledov: 152; Prenosov: 6
Celotno besedilo (980,31 KB)
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