Age Structure Research Articles

Shifting Sands: Examining and Mapping the Population Structure of Greece Through the Last Three Censuses

This paper aims to facilitate a more nuanced understanding of regional disparities in the population age structure at a local scale by applying a recent method for visualizing these disparities. Utilizing data from the three most recent population censuses in Greece, this method applies advanced data visualization techniques to map age distributions, highlighting significant variations in aging patterns across municipalities, towns, and districts. Traditional demographic analysis often overlooks local heterogeneities, leading to broad policies that often fail to address the unique needs of specific regions. Detailed maps are created by integrating geographic data with census data (using R and GIS), enabling policymakers to pinpoint areas with specific demographic challenges and opportunities. This localized approach reveals critical insights, such as regions experiencing rapid population aging, areas with younger population profiles, and zones undergoing demographic transitions. The visualization tool significantly improves the formulation of targeted strategies, enhancing the effectiveness of policies related to healthcare, workforce planning, and social services distribution. Through case studies and comparative analysis, we demonstrate the practical applications and advantages of this method in shaping public policy and strategic planning. This paper contributes to the field of geodemography by introducing and demonstrating a visualization method that enhances the accuracy of demographic analysis, providing policy makers with useful information to better address local demographic challenges and tailor strategies to specific regional needs.

The ecology of ageing in wild societies: linking age structure and social behaviour.

The age of individuals has consequences not only for their fitness and behaviour but also for the functioning of the groups they form. Because social behaviour often changes with age, population age structure is expected to shape the social organization, the social environments individuals experience and the operation of social processes within populations. Although research has explored changes in individual social behaviour with age, particularly in controlled settings, there is limited understanding of how age structure governs sociality in wild populations. Here, we synthesize previous research into age-related effects on social processes in natural populations, and discuss the links between age structure, sociality and ecology, specifically focusing on how population age structure might influence social structure and functioning. We highlight the potential for using empirical data from natural populations in combination with social network approaches to uncover pathways linking individual social ageing, population age structure and societal functioning. We discuss the broader implications of these insights for understanding the social impacts of anthropogenic effects on animal population demography and for building a deeper understanding of societal ageing in general.This article is part of the discussion meeting issue 'Understanding age and society using natural populations'.

Population age structure shapes selection on social behaviour in a long-lived insect.

Social traits are expected to experience highly context-dependent selection, but we know little about the contextual factors that shape selection on social behaviours. We hypothesized that the fitness consequences of social interactions will depend on the age of social partners, and therefore that population age structure will shape evolutionary pressures on sociality. Here, we investigate the consequences of age variation at multiple levels of social organization for both individual fitness and sexual selection on social network traits. We experimentally manipulated the age composition of populations of the forked fungus beetle Bolitotherus cornutus, creating 12 replicate populations with either young or old age structures. We found that fitness is associated with variance in age at three different levels of organization: the individual, interacting social partners, and the population. Older individuals have higher reproductive success, males pay a fitness cost when they interact with old males and females achieve lower fitness in older populations. In addition to influencing fitness, population age structure also altered the selection acting on social network position in females. Female sociality is under positive selection only in old populations. Our results highlight age structure as an understudied demographic variable shaping the landscape of selection on social behaviour.This article is part of the discussion meeting issue 'Understanding age and society using natural populations'.

Identification and Population Density of Primate Animals in the Stik Jantho Aceh Besar Educational Forest

Long tail macac (Macac fascicularis) and black langur (Trachypitecus auratus) are two species of primates protected by law. The conservation status of both is listed as vulnerable in the IUCN and appendix II status in CITES. The very sharp population decline in the monkey population is due to declining habitat quality and poaching. The STIK educational forest is a secondary forest, which is disturbed by illegal logging and forest fires. The vegetation that forms the habitat for the lives of kedih and black langur primates in this area is not yet known. There is no data on primates from the kedih and langur groups in the STIK Jantho educational forest. This is the reason why this research is important to be conducted. The purpose of this study was to obtain data on monkeyand black langurs including the number of groups, the number of species, age structure and sex ratio in the STIK Jantho educational forest. Data collection in this study used the transex path method by recording the number of groups, the number of individuals, age structure and sex ratio. Data analysis using Arch GIS 10.1 to determine the distribution of monkey and black langur by plotting each coordinate obtained, using GPS visualized in the form of a map. Determination of the density of kedih and black langur using the formula: P = D x A. Found 2 types of primate animals (Trachypitecus auratus and Macaca fascicularis), each 1 group. The number of Trachyipitecus auratus individuals 10 individuals and Macaca fascicularis 50 individuals. Both species of primate animals are included in the developing age structure and have a complete composition (adult males and females, infant and juveneel. The results are presented in the form of a distribution map of black langur groups, and the population density of kedih and black langur primates, narrated in the form of a research reporthis document.

Impact of loneliness and social support on leisure physical activity in adolescents in Luxembourg

Abstract Background Healthy lifestyle includes a regular practice of vigorous physical activity in adolescents’ leisure time. Engaging in physical activity (PA) depends on individual, social and environmental factors. Previous literature has showed that social support and loneliness can influence the practice of PA. The study aims to analyse the relation between PA during leisure time and social support and loneliness among adolescents in Luxembourg. Methods The study includes 7049 adolescents from the Health Behaviours in School-aged Children (HBSC) Luxembourg 2022 survey. PA in leisure time was categorised according to WHO recommendations for vigorous physical activity. Perceived social support (friends, family, teacher, and classmate) was dichotomised in high support and in low/medium and loneliness in feel often lonely and not feel often lonely. It was executed a binomial logistic regression to analyse the PA levels in leisure time by loneliness and social support, controlling by age, migration background, perceived wealth, and family structure, split by gender. Results In Luxembourg, boys who perceived high support from most of the sources and didn’t feel often lonely had higher chances to reach WHO recommendations for PA during leisure time (e.g. loneliness: OR = 1.38, CI95%[1.11-1.74]; family support: OR = 1.31, CI 95%[1.10-1.56]), except for teacher support (OR = 0.79, CI95%[0.67-0.93]). In contrast, girls who only perceived high support from classmates (OR = 1.21, CI95%[1.05-1.4]) and teachers (OR = 1.19, CI95%[1.01-1.38]) had higher chances to be physically active. Conclusions This is the first study to investigate the impact of social support and loneliness among adolescents in Luxembourg. Future research should investigate social-related barriers and facilitators of PA during leisure time. Key messages • Understanding adolescents social support can guide towards effective strategies that promote physical activity during leisure time. • Boys benefit from several social support sources, while girls thrive with encouragement from classmates and teachers to stay physically active in leisure time.

Association of healthy lifestyle on overweight and obesity among adolescents in Luxembourg

Abstract Background Adolescent overweight and obesity are significant public health challenges. Understanding the impact of healthy lifestyle behaviours is crucial for effective intervention strategies. The aim of this study is to analyse the association between healthy lifestyle behaviours with overweight and obesity among adolescents in Luxembourg. Methods The study was based on the HBSC Luxembourg 2022 survey and includes 8415 adolescents aged 11 to 18 years. Adolescents self-reported the frequency of fruit and vegetable consumption, physical activity, height, and body mass. Eating and physical activity behaviours were categorized based on WHO recommendations. Body Mass Index categorization followed International Obesity Task Force criteria. Binomial logistic regression of obesity and overweight with the interaction between healthy diet and physical activity was performed, controlling for age, gender, family affluence, migration background, and family structure. Results The results indicated a significant protective effect of healthy lifestyle behaviours against overweight and obesity. For overweight, adolescents engaging in either fruit and vegetable consumption (OR = 0.829, 95% CI [0.697-0.986]) or physical activity (OR = 0.719, 95% CI [0.566-0.913]) showed reduced odds compared to those with unhealthy behaviours. For obesity, similar associations were observed. Adolescents engaging in physical activity (OR = 0.407, 95% CI [0.235-0.705]) showed reduced odds compared to those with unhealthy behaviours. Combining both behaviours resulted in the lowest risk of obesity (OR = 0.366, 95% CI [0.177-0.760]) and overweight (OR = 0.473, 95% CI [0.340-0.658]). Conclusions Promoting health eating and physical activity behaviours are important strategies for preventing overweight and obesity in youth in Luxembourg. Implementing targeted interventions aimed to promote these behaviours could mitigate the burden of overweight and obesity in this population. Key messages • Healthy lifestyle matters: Fruit and vegetables consumption or regular physical activity significantly reduce the risk of overweight and obesity among adolescents. • Combining behaviours counts: Concurrent engagement in both fruit and vegetables consumption and physical activity offers the greatest protection against overweight and obesity.

Strategic Directions for Strengthening Sustainability of Forestry Workforce

Today in many countries and regions, forestry sector deals with a considerable shortage of forestry workers and faces the serious challenge of ensuring a qualified and sustainable workforce. Current global processes and structural changes, such as emigration from rural areas, aging of the population, unfavorable age structure of existing employees, negative demographic trends (migrations, decline in birth rate, negative natural increase, etc.), lack of interest in the so-called 3D (dirty, dangerous and demeaning) jobs, low cost of labor and others, significantly contribute to such an adverse situation. Additionally, forestry work, especially wood harvesting, represents a very risky, professionally highly demanding and physically extremely intensive activity, which is regularly classified as one of the most dangerous occupations with a high proportion of serious injuries, fatalities and occupational diseases. For these reasons, the forestry profession is considered unattractive, and the job of a forestry worker undesirable. All of this makes finding the people interested in these jobs very difficult, and the task of ensuring the necessary workforce for all regular activities in sustainable forest management becomes very hard. In this paper, based on the surveys carried out in the Federation of Bosnia and Herzegovina (FB&H), i.e. evaluation of forestry workforce sustainability factors, and on the study of available strategic documents, policies and case studies, strategic directions aimed at strengthening the sustainability of forestry workforce were elaborated. The sustainability factors were observed in three categories related to: a) stronger recruiting in forestry, b) more successful retention of forestry workers, and c) higher work commitment of forestry workers. Established rankings, together with other findings, were used to define four separate strategic directions: (1) Direct financial strategy, which emphasizes direct monetary payments to workers and is oriented towards labor productivity, (2) Indirect financial strategy, which focuses more on providing indirect material gains to workers and the quality of performed work, (3) Educational strategy, aimed at the education and training of workers, and (4) Technical-technological strategy, aimed at increasing the mechanization in forest operations thus reducing the demand for labor. The paper elaborates the basic starting points and main characteristics (priorities, measures and activities, stakeholders, responsible authorities, etc.) of each strategic direction considering the possibility and conditions of their implementation in national forestry sector. The objective of the paper is to raise the required awareness of the forestry workforce issues, its position and status, and also to provide foundations for enhancing the attractiveness of forestry work and improving the overall sustainability of the forestry workforce. The results of the study point out the critical issues and provide valuable insights that can help in formulating effective policies and strategies for the future.

Strengthening Effect Evaluation of Developed Stiff-Type Polyurea Sprayed on Masonry Beam Surface Under Static Loading in Experimental and Numerical Tests.

Recently, deteriorated masonry structures aged over 30 years have shown serious structural problems. Simple and rapid maintenance plans are urgently needed for aging masonry structures. Polyurea (PU) is an effective retrofitting material for aging structures due to its easy spray application. This process saves time, reduces costs, and allows the structure to remain in use during retrofitting. However, a general PU is not suitable for retrofitting aged masonry and concrete structures due to its low stiffness. In this study, stiff-type polyurea (STPU) was selected as the reinforcement material for masonry structures. It was developed by modifying the chemical mix of general PU to improve stiffness. To evaluate the strengthening effect of STPU on masonry members under static loading, tests were conducted. The flexural load capacity of masonry beams with STPU-sprayed surfaces was assessed. Three different types of STPU applications were used to select the most efficient strengthening method. Reinforcing masonry structures with STPU allows brittle failure modes to achieve ductile behavior. This improves their structural performance under lateral stresses. The experimental data were used to calibrate FEM models for simulation. These models can be used for future parametric studies and masonry structural design.

Injury of the musculoskeletal system in civilian casualties as a result of hostilities. Report 1. Age structure

The integration of the military medical supply system into the unified medical space of Ukraine involves the functional combination of forces and means of medical services and the civilian health care system in order to maximize their capabilities for effective medical supply of the troops while preserving organizational independence. The purpose of our study was to determine the clinical and epidemiological characteristics of civilian patients with trauma due to modern hostilities. Materials and methods. To carry out our work, we analyzed skeletal traumas in 137 civilian patients who were injured during modern hostilities in Ukraine and were treated in health care facilities of the frontline zone in 2014–2023. Results. Comparing epidemiological data in two different periods of the war in Ukraine, we concluded that there is some difference in the age structure of victims with traumatic injuries sustained during modern hostilities. Thus, during the high-intensity conflict, the number of children’s injuries increased dramatically. The share of victims under the age of 15 during the full-scale invasion increased 4.5 times. In this period, the percentage of young and middle-aged wounded civilians decreased. If in the period of Anti-Terrorist Operation/Joint Forces Operation the number of people aged 16–60 was 67.6 %, then with the beginning of hostilities their share decreased to 42.0 %. This trend indicates the strengthening of internal and external migration starting from February 2022. Unlike the young and middle-aged, the share of elderly and senile people increased dramatically during the full-scale war. During the period of low-intensity military operations, the number of patients aged 61–91 was 29.4 %, while during high-intensity conflict, it was already 44.8 %. A sharp increase in traumatic injuries among elderly and senile patients is another feature of this conflict. Conclusions. Publicizing the experience of providing medical care to patients with injuries sustained due to military actions in Ukraine is only at the beginning of its existence. That is why, based on the above, we planned to continue scientific research on this problem.

Age structure of carp and catfish catch as a tool to assess ecological health of fished stocks from the Ganga River system with special reference to Mahseer Tor tor (Hamilton, 1822)

In the 20th centuary, the economically important carp species Labeo rohita, Tor tor, & Labeo calbasu and the catfishes Rita rita & Bagarius bagarius contributed substantially to the total fish catch from the Ganga River system in India. Samples were recorded between December 2003 and June 2004 from fish landing centers in the Ken, Paisuni, and Tons rivers for L. rohita, T. tor and L. calbasu. Rita rita and B. bagarius were sampled between September 2001 and September 2003 in the Ganga River system. The data were used to evaluate the growth and age structures of fish populations. Age classes varied 0+–5+ for L. rohita in the Ken & Paisuni rivers and 0+–8+ in the Tons River. For T. tor, the age classes varied 1+–6+ in the Ken & Paisuni rivers and 1+–8+ in the Tons. Age classes of L. calbasu varied 1+–6+ in the Ken River, 1+–5+ in the Paisuni River, and 1+–7+ in the Tons. In the Ganga River, age classes of R. rita & B. bagarius varied 0+–7+ and 0+–6+, respectively. The L. rohita, age pyramid showed a tendency for bell shape in Ken River, base tends to be broader through bell shape in Paisuni River, and bell-shaped age pyramid was slightly distorted in Tons River. In case of T. tor, tendency for bell shape in Ken River and bell-shaped age pyramid in Paisun River & Tons River were obtained. In case of L. calbasu, heavy bottom shaped age pyramid was recorded in Ken and Paisuni rivers, while base tends to be broader in the Tons River. Bell shaped age pyramid was recorded for B. bagarius in the Ganga River while heavy bottom shape for R. rita in the Ganga River. Overall, T. tor is facing heavy fishing pressure and also targeted fish species by fishermen from the Ganga River system.

Addresses the Problem of Aging Population by Immigration in the United States

Abstract: The aging problem is becoming increasingly serious in various countries. The United States was also not spared and foreshadowed an equally negative future trend, which would lead to many problems in various aspects. Therefore, the United States has taken some policies to adapt to aging, but has not actually solved the problem. Some people believe that immigration can improve the problems brought about by the aging population. This article explores the mentioned approach through literature research and simulation. The way of immigration can improve population structure to alleviate population aging, which can be classified into two types - the age structure and the employment structure. In terms of age structure, the article will discuss how immigrants can alleviate the social risks caused by aging by the increasing number of immigrants at the working age. For the employment structure, the article will illustrate the answer to solve the slow economic evolution leaded by aging in regards to filling job vacancies for young and middle-aged immigrants.

CEO Age and Capital Structure Dynamics: The Moderating Effect of Overconfidence and Tenure

ABSTRACTThe Upper Echelons theory suggests that managerial characteristics will likely influence their financial decisions. Consistent with this theory, we examine CEO age's impact on Chinese firms' capital structure dynamics. We also investigate the moderating effects of overconfidence and tenure on the relationship between CEO age and capital structure. Using 18,235 firm‐year observations from Chinese listed firms, we document a positive relationship between CEO age and leverage. The results show that the CEOs' age‐overconfidence and age‐tenure relationship have an inverse relationship with leverage. Particularly, we find that CEO overconfidence and tenure impact market leverage more than book leverage. Our sensitivity analysis indicates that young CEOs use less debt, consistent with the market‐leaning hypothesis. We also find a positive relationship between CEO age and leverage in state‐owned enterprises. Our results are robust for decomposition analysis, selection bias test and endogeneity.

The Impact of Urbanization on Rural Population Structure in China

Urbanization has been speeding up in China since reform and opening up policies were promoted, which promotes the progression of rural economy, but furthermore provides a certain degree of negative impact on the rural population structure. On the basis of summarizing the concept of urbanization, this study provides a thorough analysis of China's recent rural population structure and urbanization trend, and finally concludes that the quickening pace of urbanization in China makes the rural population structure face some problems and challenges. This study also offers some thoughts and recommendations in this area. At the same time, when analyzing the trend and population structure, by comparing and summarizing the secondary data and relevant literature, this paper concludes that China's urbanization has caused problems such as talent shortage in rural areas, rural aging and gender structure imbalance of the left-behind population. To solve these problems, China should establish a sound and perfect social security system and encourage the integration of rural and urban development. China ought to also establish a sound pension system and optimize the population structure; in rural areas, the promotion of respect for women has been strengthened and relevant laws have been introduced to gradually eliminate gender discrimination. It is beneficial to promote the national economy, cultural development.

Trajectories and sex differences of brain structure, oxygenation and perfusion functions in normal aging

Background: Brain structure, oxygenation and perfusion are important factors in aging. Coupling between regional cerebral oxygen consumption and perfusion also reflects functions of neurovascular unit (NVU). Their trajectories and sex differences during normal aging important for clinical interpretation are still not well defined. In this study, we aim to investigate the relationship between brain structure, functions and age, and exam the sex disparities.Method: A total of 137 healthy subjects between 20∼69 years old were enrolled with conventional MRI, structural three-dimensional T1-weighted imaging (3D-T1WI), 3D multi-echo gradient echo sequence (3D-mGRE), and 3D pseudo-continuous arterial spin labeling (3D-pCASL). Oxygen extraction fraction (OEF) and cerebral blood flow (CBF) were respectively reconstructed from 3D-mGRE and 3D-pCASL images. Cerebral metabolic rate of oxygen (CMRO2) were calculated as follows: CMRO2=CBF·OEF·[H]a, [H]a=7.377 μmol/mL. Brains were segmented into global gray matter (GM), global white matter (WM), and 148 cortical subregions. OEF, CBF, CMRO2, and volumes of GM/WM relative to intracranial volumes (rel_GM/rel_WM) were compared between males and females. Generalized additive models were used to evaluate the aging trajectories of brain structure and functions. The coupling between OEF and CBF was analyzed by correlation analysis. P or PFDR < 0.05 was considered statistically significant.Results: Females had larger rel_GM, higher CMRO2 and CBF of GM/WM than males (P < 0.05). With control of sex, CBF of GM significantly declined between 20 and 32 years, CMRO2 of GM declined subsequently from 33 to 41 years and rel_GM decreased significantly at all ages (R2 = 0.27, P < 0.001; R2 = 0.17, P < 0.001; R2 = 0.52, P < 0.001). In subregion analysis, CBF declined dispersedly while CMRO2 declined widely across most subregions of the cortex during aging. Robust negative coupling between OEF and CBF was found in most of the subregions (r range = -0.12∼-0.48, PFDR < 0.05).Conclusion: The sex disparities, age trajectories of brain structure and functions as well as the coupling of NVU in healthy individuals provide insights into normal aging which are potential targets for study of pathological conditions.

Reconstruction of China’s population age and education structure from 2000 to 2020—based on the data from the 5th to 7th national population censuses in China

Reconstruction of China’s population age and education structure from 2000 to 2020—based on the data from the 5th to 7th national population censuses in China

Age, Growth, Sex Composition, and Diet of the Burbot, Lota lota, the Only Freshwater Species of the Family Lotidae in the Amur (Heilongjiang) River, Northeast China

Information about the population structure, including the age and sex composition, growth characteristics, and diet of fish, is essential for the conservation and sustainable exploitation of fish stock. The burbot, Lota lota, is the only freshwater species of the family Lotidae in the Amur (Heilongjiang) River catchment located in northeastern China. Information on the biological characteristics and data on the population structure of this fish from the Amur River are scarce. To study these factors in burbot, Lota lota, in the Amur River of China, 749 specimens from four sampling areas were taken and analyzed in October 2022, January 2023, and May 2023. The ages of the sampled fish ranged from 1+ to 7+ years. The female/male ratio was 1.04:1, and body length and mass varied from 175 to 595 mm and 73.5 to 1958.7 g, respectively. The length–weight regression parameter b value was estimated as 2.80. The parameters of the von Bertalanffy growth model were L∞ = 596, K = 0.221, and t0 = −0.771 for all sampled fish; L∞ = 625, K = 0.208, and t0 = −0.756 for females; and L∞ = 584, K = 0.219, and t0 = −0.980 for males. The analysis of the stomach contents showed fish to be the major source of nutrition across all areas and sampling periods. In January, the secondary prey of burbots in the Huma reach of the upper Amur River was aquatic insect larvae, while, in the Tongjiang and Fuyuan reaches of the middle Amur River, the secondary prey was shrimp. The mean stomach fullness index and rate of empty stomachs differed with the sampling area, with the greatest proportion of empty stomachs observed in the Luobei reach of the middle Amur River, and the lowest in the Tongjiang and Fuyuan reaches. The mean stomach fullness index showed the opposite trend. In the Huma reach, the contributions of fish to the diet and the mean stomach fullness index were significantly higher in May than in October and January. The study provides the first detailed information on the population age and sex structure, growth patterns, and feeding ecology of burbots from the Amur River, China. The results will aid in formulating management strategies and regulations for local populations of burbots in the Amur River, China.

KARAKTERISTIK STRUKTUR POPULASI TERNAK BABI DI DESA LATUHALAT KECAMATAN NUSANIWE KOTA AMBON

The aim of this research on the structural characteristics of the pig population in Latuhalat Village is to understand the composition, dynamics and structural characteristics of the pig population in Latuhalat Village. The parameters measured in this research are the characteristics of the respondents which consist of: age, gender, education, livelihood and population structure which includes the number of pigs per age group and the sex ratio. The research was carried out with 40 farmers as samples and this type of research was descriptive research. The research results show that the characteristics of respondents in the research location, Latuhalat village, Nusaniwe District, are dominated by men in productive age with secondary education and running mixed farming businesses. The population structure of pigs is dominated by female livestock, both at calf age (50.63%), young age (51.37%) and adult age (60.53%). This research also identified the main challenges by farmers, is the low knowledge and skills of farmers which resulted in low pig productivity. The recommendation from this research is that there needs to be an extension program that is carried out on the government and from academics and needs to be given a technology, especially in the field of feed and housing technology.

Demographic challenges in the context of the state policy of the Russian Federation in the sphere of maternity and childhood protection

The article examines current demographic trends in Russia in comparison with population changes based on data from the Federal State Statistics Service of Russia (Rosstat) and the UN Population Division. The specifi cs of the age structure of the population of Russia, formed by a number of demographic waves, are such that changes in the number of births and the size of age groups occur in waves; this trend will continue in the coming decades. The state policy of the Russian Federation in the fi eld of family support, aimed at increasing the total fertility rate from 1.3 to 1.6 by 2030 and to 1.8 by 2036, should provide for the introduction of new health-preserving and reproductive health protection technologies, the development of childhood infrastructure, antenatal clinics and perinatal centers for high-quality and aff ordable medical care for mothers and children.

Data-driven corrosion failure probabilistic assessment model for reinforced concrete structures

The corrosion-induced failure of marine reinforced concrete structures, stemming from prolonged exposure to environments with elevated chloride content, poses a significant threat to structural integrity and serviceability. Traditional models predominantly depend on prior information to estimate the spatial stochastic degradation of aging structures, leading to a lack of comprehensiveness and accuracy in evaluation results. To address these limitations, a data-driven probabilistic assessment model for corrosion failure is proposed. This model incorporates a pre-training phase that integrates electrochemical simulations with long-term exposure data to establish the spatiotemporal distribution of corrosion failures, thereby facilitating a thorough assessment of overall damage by quantifying the corrosion failure proportion while propagating epistemic uncertainty. Subsequently, a multivariate function is derived using the non-dominated sorting genetic algorithm to elucidate the relationship between input and output variables. The efficacy of the data-driven model is evaluated through experimental observations and model predictions. The Hangzhou Bay Bridge project serves as a case study, wherein this model is demonstrated using actual data obtained from exposure experiments and field detection. Furthermore, the proposed model enables a rapid prejudgment of corrosion failure proportion, significantly reducing diagnostic time compared to conventional procedures.

Bioresources of lake Mostovoye and ways of their rational use

The ichthyofauna of most water bodies in the Altai Krai is represented by low-value and slow-growing fish. Fish productivity is largely determined by the degree of exploitation of the reservoir and the form of organization of the fishery. Rational fishery in natural reservoirs should ensure the exploitation of the ecosystem of the reservoir as a single whole. Mostovoe Lake is located in the Zavyalovsky and Baevsky districts of the Altai Krai, is one of the largest freshwater lakes in the Altai Territory, belonging to the floodplain of the Kulunda River. The water in the reservoir is of the sulfate-chloride class of the first type, fully meets all fish farming requirements. The collection of ichthyological material was carried out by the method of control catches. The species composition and spatial distribution of fish were studied by setting a set of fixed gill nets in the reservoirs. Information on the size and age structure of populations, catches of the main commercial fish and crayfish in Mostovoe Lake is provided. The magnitude of the fishing effort and the assessment of the state of aquatic bioresources (ichthyofauna) in the reservoir were carried out using one of the expert assessment options — the point systems method. The ichthyofauna of Mostovoe Lake includes six species that are subject to commercial fishing: common pike, roach, silver carp, river perch, common carp (carp), and common pike perch. Of the commercial invertebrates, crayfish is caught. The indicators of the commercial stock and the recommended catch of bioresources in the reservoir were calculated. Recommendations for regulating fisheries based on ichthyological monitoring are proposed. A certain effect for stabilizing the structure of the ichthyocenosis of the reservoir can be made by fishery melioration: the introduction of herbivorous fish — white amur (Ctenopharyngodon idella) and silver carp (Hypophthalmichthys molitrix) for a more complete use of the food base of the lake — phytoplankton and macrophytes. It is necessary to continue monitoring studies of the lake’s winter oxygen regime.