Search Results (180)

In recent years, youth social action has emerged as a novel concept which strives to empower young people, creating an engaged and socially aware youth population. The aim of this narrative review was to summarise, explain, and interpret international research evidence to understand the effectiveness of youth social action interventions implemented with young people between the ages of 8 and 16 years. This study followed the General Framework of Narrative Reviews. Peer-reviewed studies published in the English language that explicitly addressed ‘youth social action’ or ‘social action’ within the title or abstract were identified by means of electronic searches on EBSCOhost (Education Research Complete, MEDLINE and Child Development and Adolescent Studies databases). Search terms included “Social Action” OR “Youth Social Action” AND population (Child* OR Youth OR Adolesc* OR “School Child” OR Juvenile OR Teenag*) AND study design (intervention OR project OR evaluation OR initiative OR program*). Sixteen studies were included after full-text screening, detailing eight individual youth social action interventions. The findings revealed a range of psychosocial, health, and personal development benefits for youth who participated in social action interventions. However, the evidence base was limited by poor methodological reporting and a lack of process evaluations to confirm implementation fidelity. Future research should utilitise stronger research designs, assess both individual and community outcomes, and include follow-up measures to determine the long-term impacts of youth social action projects. Full article

A powered roof support in a mining complex comprises a set of sections positioned side by side. Thus, it creates space for the mining longwall shearer and the excavated material haulage conveyor. The main role of the powered roof support is to secure the machinery and equipment, as well as the working crew. This roof support also takes over the load from the rock mass during operation. The loads and phenomena that cause damage to the powered roof support construction in real conditions became the basis for conducting a series of studies and analyses of the stresses and strains that occur. This study aimed to obtain the results of research and analysis on the damage to the floor base, which is the most important part of the entire powered roof support construction. The actual pressure measurements carried out in the space under the piston leg of the powered roof support under real conditions indicated an excessive load on the powered roof support construction. This load was mainly due to the ceiling conditions, while the floor conditions for providing the construction were difficult to determine due to the too-soft floor substrate. The Finite Element Method (FEM) was used to solve the problem. The construction of the two powered roof support bases was subjected to numerical analysis in order to propose structural changes. The obtained numerical test results indicated a solution to the problem of damage and significant structural changes. Full article

During advancing the working face at Guojiawan Coal Mine, hard rock faults are encountered, which hinder the normal cutting of the shearer. Hydraulic fracturing is applied to pretreat the hard rock materials. Un-directional hydraulic fracturing experiments in transparent gelatin samples are carried out. The influence of the differential stress, the borehole dip angle on the initiation and propagation of un-directional hydraulic fractures (HFs) are investigated. Three field test schemes of hydraulic fracturing are proposed and implemented at the 51207 working face of Guojiawan Coal Mine. Compared with the results of different test schemes, the cutting current ratio of the shearer is reduced by 51.70% and the cutting efficiency is increased by 89.93%. Therefore, the feasibility of hydraulic fracturing to improve the cuttability of the hard rock materials is verified, which provides a theoretical basis and field guidance for hydraulic fracturing pretreatment of the hard rock materials at a coal mining working face. Full article

The digitization of the instrument control system in monitoring operations makes the problem of the operator’s situational awareness failure more prominent. In order to better prevent this occurrence, this paper explores the failure of situational awareness from the perspective of cognitive function. The subjects were randomly divided into two groups: a working memory training group and a control group. Working memory measurements and coal mining machine monitoring simulation system operation tasks were performed before and after training, and the task performance, situational awareness scale, and EEG index data were recorded. The results showed that, after the training, there was a significant improvement in the task performance of the monitoring operation and the scores of the situational awareness scale, and there were different degrees of activation in the θ, α₂, and β₁ frequency bands. It was demonstrated that working memory training could help to improve the rapid reaction and decision-making abilities of operators in complex or emergency situations, thus preventing the failure of situational awareness. This study provides a new direction for research on the prevention of situational awareness failure. Full article

The dehesas are one of the most unique and characteristic landscapes of the Extremadura region. Together with their natural values, they are an environment in which trades, knowledge and ways of life rooted in the tradition of rural communities are still developed. However, ancestral knowledge and practices are in danger of disappearing. Faced with this problem, this study is focused on the benefits of tourism, using sustainability criteria to evaluate their ability to educate and to increase awareness and sensitivity of the importance of maintaining this intangible cultural legacy. Based on this premise, the main objective is to determine and analyze tourists’ evaluations of the traditional shepherd’s trade and the educational possibilities of agritourism experiences. For this purpose, a survey was carried out among 102 tourists who visited different cheese dairies in an Extremadura region that offers agritourism experiences. In addition, this work also aims to know the current situation of the shepherd’s trade, identifying the benefits of its conservation and determining the threats that hinder its preservation. It also seeks to determine the solutions that could safeguard it. To this end, the Delphi method was used and 26 experts, mainly shepherds and shearers, were interviewed. The results reveal that tourists can identify the educational and cultural functions associated with pastoralism. They also recognize increased curiosity, empathy and environmental awareness as the main benefits derived from the tourism experience. The interviews reveal the suitability of disseminating the heritage and educational value of the dehesa through sustainable tourism experiences to increase interest in the rural world, revalue ancestral knowledge and contribute to its preservation. Full article

Fe90 alloy has a high weld hardness, good toughness, and high oxidation resistance, and is often used as a cladding material to repair the surfaces of 42CrMo steel structures of large shearer picks. The influence of the laser cladding processing parameters on the microstructure, properties, and formation mechanism of Fe90 alloy layers on the surface of 42CrMo steel was studied. Simulations were conducted to investigate how these processing parameters affect the temperature field and internal stress of the cladding layer. A complex nonlinear relationship between variables and residual stresses in the laser cladding layers obtained by additive manufacturing was fitted. An optimization model for residual stress in the cladding layer was established and an improved genetic algorithm was used for optimization, which resulted in a 15.88% reduction in residual stress. The results show that optimizing the processing parameters increased the amount of Ni-Cr-Fe solid solution in the cladding layer, enhancing its strength and corrosion resistance. The amount of residual stresses rose with increases in laser power, but at higher powers, increasing the scanning speed and spot diameter reduced stresses. At lower powers, the amount of residual stresses initially increased and then decreased with the scanning speed, with more significant changes occurring with larger spot diameters. Analyzing temperature and residual stress changes allowed us to improve the cladding layer quality, providing a theoretical basis for laser cladding on 42CrMo. Full article

Background/Objectives: High-quality inclusive education is important for promoting the positive development of children with disabilities in early childhood care and education (ECCE) settings. However, ECCE teachers may not have the knowledge and skills to manage challenging behaviors in young children, especially those with disabilities. Infant and Early childhood mental health consultation (IECMHC) is one mechanism to support the professional development of teachers. This study explored the impact of an evidence-based IECMHC program, Jump Start Plus COVID Support (JS+CS), on outcomes for teachers in classrooms including children with disabilities. Methods: Utilizing a RE-AIM framework, we examined the extent that JS+CS impacted teacher outcomes related to classroom practice and teacher attitudes after the initial intervention period. In addition, we examined the extent that the classroom children with disability ratio moderated the impact of the intervention on teacher outcomes. Using a cluster randomized controlled trial in a sample of 138 racially and ethnically diverse teachers in 31 ECCE centers, we examined the reach, effectiveness, adoption, and implementation of JS+CS. Results: The results indicate that the JS+CS program shows promise as an intervention to support ECCE teachers working in classrooms with children with disabilities, particularly in improving teacher safety practices, behavior management skills, and resiliency coping. In addition, the program was adopted equally in classrooms that served children with and without disabilities. Conclusions: This is a unique contribution to the literature given that no previous IECMHC programs have examined adoption in classrooms serving children with disabilities. Further investigation is needed to determine the specific factors that impact program implementation considering that this study was conducted during various phases of the COVID-19 pandemic. Full article

Background/Objectives: Adequate folate intake is required in preterm infants for rapid growth and development, but there is little evidence to back recommendations. We aimed to assess folate status in preterm infants at discharge and in early infancy, according to exposure to folate sources, particularly in those exclusively/predominantly breastfed. Methods: A prospective, multicenter, observational cohort study was conducted in the UK, involving 45 preterm infants <33 weeks’ gestational age (GA) exclusively/predominantly fed human milk when approaching NICU (Neonatal Intensive Care Unit) discharge. Serum folate levels were measured near NICU discharge (T1) and at 2–3 months corrected age (T2). Folate status was categorized per WHO (World Health Organization) guidelines: deficiency (<6.8 nmol/L), possible deficiency (6.8–13.4 nmol/L), normal (13.5–45.3 nmol/L), and elevated (>45.3 nmol/L). Nutritional information on feed and supplements was collected from hospital notes and maternal interviews. Results: Thirty-two infants (71%) received parenteral nutrition. Twelve infants (32%) remained exclusively breastfed at T2. No infant from the whole cohort had a serum folate concentration <13.5 nmol/L at either time point. A proportion of infants had serum folate concentrations >45.3 nmol/L: 14/45 (31%) at T1, 19/37 (42%) at T2, and 7/37 (16%) at both time points. Elevated concentrations were seen particularly in infants who received folic acid supplements or nutrition containing folic acid, such as parenteral nutrition and breastmilk fortifiers. Conclusions: Folate deficiency was not observed in this cohort; folate concentrations were high and in line with those observed in healthy term infants. Further research is needed to assess the high folate concentrations in premature babies and whether they may have any adverse clinical impact. Full article

Background: Microplanning is widely recognized as a critical tool for improving immunization coverage and equity and is considered a core component of routine immunization. However, there is limited evidence on how microplans are developed and implemented and the effectiveness of microplanning. As such, this study sought to review the existing evidence on implementation and institutionalization of microplanning; identify strategies to improve microplanning; and document evidence on new approaches to microplanning, including digitally enhanced and integrated microplanning. Methods: We employed a three-stage mixed-method approach. First, we conducted a literature review on microplanning for routine immunization. Second, we administered an online survey to gather insights into the factors that constrained and enabled microplanning in low-resource settings. Third, we conducted key informant interviews to better understand the barriers and enablers. Results: We found a paucity of published literature describing the drivers and effectiveness of microplanning and how to sustain it over time. Our review indicates that factors at both the development and implementation stages influence implementation and whether the process is sustained over time. These include the level of community engagement and health care worker ownership, access to data, the complexity of the microplanning tools, and the extent to which supervisors follow up on the plans. Conclusion: Our review indicates that microplanning is successful when health care workers and communities are engaged in the development process. While these findings highlight the benefits of a ‘bottom-up’ approach to microplanning, this may be more resource-intensive, and there remains a need for more research on the costs and benefits. Full article

Introduction: The SARS-CoV-2 pandemic presented unique challenges to the health-care system and prehospital emergency medical services. An increasing prevalence of burnout has been described, which in turn is associated with mental illness. The aim of this paper was to evaluate burnout through a sex comparison and to analyze associations of burnout with personality traits during the SARS-CoV-2 pandemic. Methods: Eighty-eight emergency physicians and field shearers of Kharkiv City (Ukraine) emergency medical services (52% women) participated in the quantitative cross-sectional study. In addition to sociodemographic and occupational data, the Maslach Burnout Inventory (MBI) and the Freiburg Personality Inventory (FPI) were applied and analyzed in the sex comparison. Correlation analyses were performed to describe the relationships between the MBI dimensions and FPI traits. Results: The average age of the respondents was 35.1 ± 13.5 years. The prevalence of burnout during the pandemic was 6.5% in women and 2.4% in men. Only the scores on the MBI dimension cynicism were significantly (p = 0.027) higher in women than in men. Two personality traits differed between sexes: inhibition and male/female self-reports. Predominantly moderate correlations were found between the FPI traits and the MBI dimensions. Conclusions: Although the prevalence of burnout in this occupational group during the pandemic was similar to prepandemic figures reported in the literature, more than half of the male and female paramedics showed average-to-high scores on the three MBI dimensions. Because burnout is associated with other mental illnesses and prolonged incapacity, workplace-based interventions should be implemented. Full article

Cysticercosis is a parasitic infection and neglected tropical disease caused by Taenia solium, or the pork tapeworm. Cysticercosis with central nervous system involvement, or neurocysticercosis, is a leading cause of chronic headaches and epilepsy in endemic regions, including Latin America and Asia. In the United States, the epidemiology of cysticercosis has not been well described. We conducted a cross-section serosurvey of Mexican-American adults residing along the Texas–Mexico border (Starr County, Texas) and identified an overall seroprevalence of 7.4% (45/605) for cysticercosis. Brain imaging studies conducted on seropositive study participants identified lesions consistent with calcified neurocysticercosis in 2 of the 45 seropositive individuals. Female sex (p = 0.021), employment in healthcare, caregiving, or social service (p = 0.002), and indoor occupation (p < 0.001) were found to be significantly associated with seropositivity. Further study is needed to evaluate the burden of neurocysticercosis and local transmission risk in this community. Full article

During shearer operation, the piston rod is susceptible to wear from the invasion of pollutants, thus ruining the sealing ring in the hydraulic cylinder. This work attempts to conduct a systematic investigation of Cu-doped diamond-like carbon (Cu-DLC) film to improve the seal performance. The failure process of the cylinder was analyzed, and relevant parameters were determined. Several Cu-DLC films were deposited on the substrate of the piston rod in a multi-ion beam-assisted system, and their structures and combined tribological performances were investigated. The hardness of the film ranges from 27.6 GPa to 14.8 GPa, and the internal stress ranges from 3500 MPa to 1750 MPa. The steady-state frictional coefficient of the film ranges from 0.04 to 0.15; the wear rate decreases first and then increases, and it reaches its lowest (5.0 × 10⁻⁹ mm³/N·m) at 9.2 at.% content. a:C-Cu_9.2% film presents optimal combined tribological performances in this experiment. The modification mechanism of Cu-DLC film for the seal performance may come from the synergistic effects of (i) the contact force and friction-heat-induced film graphitization, (ii) Cu doping improves the toughness of the film and acts as a solid lubricant, and (iii) the transfer layer plays a role in self-lubrication. Full article

Smart mining solutions currently suffer from inadequate big data support and insufficient AI applications. The main reason for these limitations is the absence of a comprehensive industrial internet cloud platform tailored for the coal industry, which restricts resource integration. This paper presents the development of an innovative platform designed to enhance safety, operational efficiency, and automation in fully mechanized coal mining in China. This platform integrates cloud edge computing, real-time data processing, and AI-driven analytics to improve decision-making and maintenance strategies. Several AI models have been developed for the proactive maintenance of comprehensive mining face equipment, including early warnings for periodic weighting and the detection of common faults such as those in the shearer, hydraulic support, and conveyor. The platform leverages large-scale knowledge graph models and Graph Retrieval-Augmented Generation (GraphRAG) technology to build structured knowledge graphs. This facilitates intelligent Q&A capabilities and precise fault diagnosis, thereby enhancing system responsiveness and improving the accuracy of fault resolution. The practical process of implementing such a platform primarily based on open-source components is summarized in this paper. Full article

To further enhance the intelligence level of coal mining faces and achieve the autonomous derivation, learning, and optimization of shearer navigation cutting, this paper proposes the methods of shearer digital twin navigation cutting motion planning based on the concept of shearer autonomous navigation cutting technology and intelligent coal mining face digital twins. This study includes the digital twin theory and the construction method of the shearer digital twin navigation cutting motion planning system based on this theory. Based on the digital twin theory, a shearer digital twin navigation cutting motion planning system was constructed. This system supports the service functions of the shearer cutting digital twin, dynamic navigation map digital twin, reinforcement learning environment construction, and motion planning through the physical perception layer, comprehensive data layer, and digital–model fusion analysis layer. Finally, by comparing the effects of the DQN-NAF and DDPG deep reinforcement learning algorithms in the shearer motion planning task within the constructed digital twin environment, the results show that the DQN-NAF algorithm demonstrates better performance and stability in solving the shearer digital twin motion planning task. Full article

Accurately obtaining the geological characteristic digital model of a coal seam and surrounding rock in front of a fully mechanized mining face is one of the key technologies for automatic and continuous coal mining operation to realize an intelligent unmanned working face. The research on how to establish accurate and reliable coal seam digital models is a hot topic and technical bottleneck in the field of intelligent coal mining. This paper puts forward a construction method and dynamic update mechanism for a digital model of coal seam autonomous cutting by a coal mining machine, and verifies its effectiveness in experiments. Based on the interpolation model of drilling data, a fine coal seam digital model was established according to the results of geological statistical inversion, which overcomes the shortcomings of an insufficient lateral resolution of lithology and physical properties in a traditional geological model and can accurately depict the distribution trend of coal seams. By utilizing the numerical derivation of surrounding rock mining and geological SLAM advanced exploration, the coal seam digital model was modified to achieve a dynamic updating and optimization of the model, providing an accurate geological information guarantee for intelligent unmanned coal mining. Based on the model, it is possible to obtain the boundary and inclination information of the coal seam profile, and provide strategies for adjusting the height of the coal mining machine drum at the current position, achieving precise control of the automatic height adjustment of the coal mining machine. Full article