Atrial fibrillation (AF) is the most common
cardiac arrhythmia and is associated with increased morbidity and mortality.
Early prediction of AF episodes remains a clinical challenge. This study aimed
to generate physiopathological hypotheses for AF onset by analyzing
correlations among heart rate variability (HRV) parameters in patients
monitored via long-term Holter ECG. We utilized the IRIDIA-AF database,
comprising 1319 paroxysmal AF episodes from 872 patients. An XGBoost machine
learning model was developed to predict AF onset within 24 h using short- and
long-term HRV features, fragmentation indices, and non-linear metrics extracted
during sinus rhythm. Model interpretation was performed using SHapley Additive
exPlanations (SHAP) values, and dimensionality reduction techniques were
applied for data visualization. The model achieved an area under the receiver
operating characteristic curve of 0.919 and an area under the precision-recall
curve of 0.919, with high accuracy, sensitivity, and specificity. Key
predictive features included short-term vagal activity, HRV fragmentation
indices, and non-linear parameters, highlighting the role of the autonomic
nervous system in AF initiation. Our findings suggest that distinct
physiological profiles, detectable via HRV, may underlie AF susceptibility and
could inform personalized monitoring and prevention strategies.
The purpose of the article is to study the functioning of lexical units of Chinese origin in the speech of representatives of the Far Eastern emigration. The language of everyday communication is the first to respond to socio-cultural, ethnocultural, ethno-religious processes occurring in society. At present, when the culture of Far Eastern emigration in its close interaction with Chinese culture has become a fact of history, the reconstruction of the processes of intercultural communication between Russians and Chinese in Harbin causes great difficulties. This explains the relevance of studying the Chinese influence on the language of Russian emigrants who found refuge in Harbin in the first half of the 20th century. The novelty of the work is due to the lack of comprehensive studies dealing with Chinese borrowings in the everyday language of ordinary Harbin residents. An appeal to the memories and oral histories of Harbin residents allows us to trace how lexemes borrowed from the Chinese language and continuing to live in the linguistic consciousness of people who grew up in Harbin. The methodology of this article is based on historical-cultural, functional, linguocultural, and lexical-semantic approaches, as well as interviewing. The work uses materials from the authors’ field research among Harbin residents. Based on the results of the study, the authors conclude that although most Russians living in Harbin in the first half of the 20th century did not speak Chinese, Chinese borrowings were a constant part of their lives. This is especially true for various lacunae related to everyday realities, cooking, traditional culture, etc. Harbin residents organically assimilated such lexical units and preserved them in their speech for decades—even outside China. Of course, this testifies to close ethnocultural contacts between Russians and Chinese in Manchuria.
Urban heat and oasis effects significantly alter urban microclimates due to anthropogenic heat emissions and the thermal properties of urban surfaces. This study aims to quantitatively assess the thermal effects of different pavement types on outdoor temperatures across seasonal extremes in a temperate four-season climate. Conducted in Arak city, Iran, on 22 July and 22 January 2023, this research investigates both warm and cold seasons to provide a comprehensive understanding of pavement influence on urban microclimates throughout the year. Using the ENVI-met 5.0.3 modeling software, an environmental meteorology tool for simulating urban microclimates, the thermal performance of commonly used asphalt pavement was compared with alternative materials such as basalt and light-colored concrete on Dr. Hesabi Street. Simulation results reveal that basalt and light-colored concrete pavements reduce summer cooling loads by up to 3.49 degrees Celsius (°C), enhancing pedestrian thermal comfort, but simultaneously increase winter heating demands by 1.04 °C. This balance presents an optimal scenario to minimize adverse climate effects across seasons. The findings offer valuable insights for sustainable urban planning, promoting resilient city design strategies that mitigate heat and oasis effects in diverse climates. This study contributes actionable recommendations for urban planners seeking to balance thermal performance in temperate climates with seasonal variability.
A possibility to initiate surface reactions by resonant IR laser radiation has been studied. Several systems have been tried, including those with linkage isomerism, such as CO bound to cations in zeolites, decomposition of adsorbed unstable molecules like ozone or HN3, reactions of vibrationally excited molecules with coadsorbed species, or the effect of resonance excitation of hydroazide acid HN3 upon its ability to induce the protonation of dimethylpyridine adsorbed on silanol groups of silica. In almost all the experiments, the changes caused by irradiation were weak, and isotopic selectivity was rather poor. The choice of systems and possible ways to improve their characteristics are discussed as well as the perspectives of their usage for isotope separation or other practical tasks.
