Physical Problems Research Articles

Assessing Knowledge, Attitudes, and Practices of Tobacco Cultivators Regarding Their Health Hazards: A Study on Kushtia District

Abstract Background and aims: Tobacco farming is common in Bangladesh, particularly in Kushtia district, but it's harmful to farmers' health. This study looks at what tobacco farmers know, think, and do about their health. The findings will help create targeted interventions to improve their well-being. Methods: A survey was conducted among 300 tobacco farmers in Kushtia Sadar, Mirpur, and Daulatpur upazilas, including 214 males (71.3%) and 86 females (28.7%). Data were collected using a structured questionnaire covering demographics, knowledge, attitudes, and practices. Descriptive statistics and Pearson correlation analysis were performed using SPSS version 27 and Microsoft Excel version 19. Results: The study found that 71.3% of tobacco farmers were men, and 38% had no formal education. Health problems were common, with 33% reporting allergies, 32% suffering from coughs and breathing issues, and 24% experiencing headaches. While 73.3% recognized the harmful effects of pesticides, only 59.3% were aware of the risks of handling tobacco leaves, and 40.7% acknowledged serious health risks from tobacco farming. Correlation analysis showed education level positively correlated with reporting physical health problems (r = 0.181, p < 0.01). Physical health problems also correlated with acknowledging pesticide risks (r = 0.230, p < 0.01) and concerns about long-term health effects (r = -0.240, p < 0.01). Conclusion: In summary, this study highlights the need for targeted intervention to enhance knowledge and safer farming techniques, while also advocating for measures to protect farmers' health and promote sustainable practices in the tobacco sector. Keywords: Knowledge, Tobacco Cultivators, Health Hazards.

Challenges Linked to Post-Polio-Paralysis in Khyber Pakhtunkhwa Region

Background: Poliomyelitis is a highly infectious viral disease often causing permanent paralysis. Post-Polio Paralysis (PPP) involves the delayed onset of new or worsening neuromuscular symptoms years after the initial attack. Polio survivors face numerous physical disabilities and significant social, financial, and human rights barriers. Aims: To identify the challenges faced by individuals with PPP in the Khyber Pakhtunkhwa region. Methods: The study employed a cross-sectional survey design with a sample size of n=200, selected through non-probability convenience sampling. Data were collected using the Post-Polio Clinic Questionnaire and analyzed with SPSS 22. Results: The gender distribution was 21.50% female and 78.50% male. New health and physical problems (neurological, arthritis, and physiological) were observed in 64.5% (n=129) of participants. Aggravated previous complications, such as pain, fatigue, and muscular atrophy, were reported by 91.5% (n=183). Difficulty performing heavy tasks was noted by 49.5% (n=99). Using public transport was a challenge for 46.5% (n=93), and driving a car was deemed impossible by 70% (n=140). Using an Indian commode as a toilet was a complication for 58% (n=116) of participants. Conclusion: The study reveals significant health and daily life challenges for polio survivors in Khyber Pakhtunkhwa, including a high prevalence of new and worsening neuromuscular symptoms, aggravated complications like pain and fatigue, and difficulties with heavy tasks, public transport, driving, and using certain toilets. These findings underscore the urgent need for targeted interventions to improve the quality of life for polio survivors by addressing their physical health and social and financial barriers.

A Descriptive Study To Assess The Job Stress And Satisfaction, Among Operating Room Nurses Working At Multi Specilty Hospital Of Vellore, Tamil Nadu

We use the word "stress" when we feel that everything seems to have become too much - we are overloaded and wonder whether we really can cope with the pressures placed upon us. Anything that poses a challenge or a threat to our well-being is a stress. More than 60% of nurses say they have suffered the side-effects of workrelated stress, such as physical or mental health problems in the past year. according to the findings from our latest annual survey on the state of nursing. “l am nearly on my knees with the level of work l have. l am beyond exhausted and have gone off with stress today”. Job satisfaction is defined as the affective feeling an employee has towards their job. A descriptive study was conducted to assess the job stress, and job satisfaction among the staff nurses working in the Operating Room of Multi-specialty Hospital Vellore in Tamil Nadu. All the nurses working in the OR who fulfilled the inclusion criteria was selected using total enumerative sampling technique. The data was collected by administering the self-administered questionnaire for job stress and the job satisfaction. Instrument: The job stress will be assessed by using the perceived stress scale which is a free standardized tool. The investigator developed a tool to assess the job satisfaction. The instrument had three parts. Part I Demographic data, Part II job satisfaction The investigator prepared the 5 point Likert scale under the headings of patient care. Interpersonal relationship, professional development. Personal development and the ward management which got 25 questions with the description of highly dissatisfied, dissatisfied, neither dissatisfied nor satisfied, satisfied, highly satisfied. and Part III was to assess the job stress. Perceived stress scale which has got 10 questions with the description of 0 to 4. 0=Never, 1= almost never, 2= sometimes, 3= fairly often, 4= very often, used to assess the Job stress Scoring: The sum of the score was added up and the total score was 125 for the job satisfaction < 25 was considered as Highly dissatisfied, 26-50 was Dissatisfied 51- 75 neither dissatisfied nor satisfied 76- 100 Satisfied and 101- 125 was Highly satisfied. To get a total score for the Job stress each item was added up. Individual scores on the PSS can range from 0 to 40 with higher scores indicating higher perceived stress. 0-13 was considered low stress. 14-26 was considered as moderate stress and 27-40 was considered high perceived stress.

Psychosocial characteristics of suicide deaths by regional types in Korea: An analysis based on population inflow and outflow.

This study aims to investigate the psychosocial characteristics of suicide deaths in Korea according to population inflow and outflow, and to identify high-risk suicide groups by regional type in order to establish tailored suicide prevention plans for each region. The analysis included 4193 suicide deaths from four regional types in Korea. The data source was a comprehensive survey of suicide deaths through police investigation records from the Korean government. The analysis involved collecting demographic variables, suicide-related variables, and stress variables at the time of death for suicide deaths in each region and conducting cross-analysis and multinomial logistic regression analysis. Across all regions, factors such as male gender, unemployment, hanging in one's own home, and mental health problems were prevalent. However, in population-inflow urban areas, early-middle age and economic problems were higher, in population-outflow urban areas, late-middle age and economic problems were more prominent. Additionally, in both inflow and outflow rural areas, there was a relatively higher proportion of old age and physical health problems. This study is significant for confirming common and specific factors influencing suicide in each region, and for proposing considerations when formulating tailored suicide prevention plans for local communities.

Interventions for left-behind children in Mainland China: A scoping review

BackgroundAs the discussion of Chinese left-behind children (LBC) continues, intervention programs dedicated to this population increase and diversify. While reviews have summarized intervention programs promoting LBC’s health and psychological wellbeing, there is no synthesis depicting a comprehensive picture. This scoping review systematically examines interventions tackling LBC’s various issues and identifies their design and foci. MethodWe performed a systematic literature search to extract intervention studies from four English (i.e., Web of Science, Scopus, Embase, & PsycINFO) and one Chinese (i.e., CNKI) database. The quality of the studies was assessed using the Mixed Methods Assessment Tool (MMAT). Two main rounds of deductive coding were performed on Nvivo 12 plus to identify the design and foci of the interventions. ResultsThirty-three articles were identified for our final review. Twenty-six were published in Chinese and seven in English. Existing interventions have tackled multiple psychological, social, physical, developmental, and sexual problems or needs of Chinese rural left-behind children. Among them, LBC’s psychological wellbeing has drawn the most attention. The majority of the reviewed studies performed a randomized controlled trial (N=20). Quantitative evaluation is prevalent, with only one study applying a purely qualitative evaluation. In addition, only two studies adopted validated interventions, while the others are self-designed. ConclusionsThe review results indicate several gaps in intervention studies for LBC. First, many existing interventions have considered LBC’s psychological and social wellbeing, while little effort has been paid to address their educational and intellectual development. Further, while existing interventions are concerned with LBC’s temporary needs, their long-term life planning, as well as their current self-efficacy and self-concept driving their actions towards future self, were neglected. As for the intervention design, empirically validated interventions are recommended for future studies for their verified efficacy and evidence-based standardized practice. In addition, a qualitative evaluation should be considered because it might be more powerful in eliciting realistic and viable solutions to improve the effectiveness and reliability of the interventions from the participants.

Structure-preserving methods for Marcus stochastic Hamiltonian systems with additive Lévy noise

A general structure-preserving method is proposed for a class of Marcus stochastic Hamiltonian systems driven by additive Lévy noise. The convergence of the symplectic Euler scheme for this systems is investigated by Generalized Milstein Theorem. Realizable numerical implementation of this scheme is also provided in details. Numerical experiments are presented to illustrate the effectiveness and superiority of the proposed scheme. Applications of the method to solve two mathematical physical problems are provided.

On-the-fly clustering for exascale molecular dynamics simulations

Computational resources have experienced exponential growth in the last decades enabling the simulation of complex physical problems at the cost of a massive increase in data storage. This is especially true for N-body simulations now reaching billions or trillions particles in certain cases. To overcome the drawbacks of data storage on disk for post-processing purposes, on-the-fly analysis has gained momentum but still represents a challenge in both its implementation and efficiency without impacting the simulation engine performances. This work provides a new in-situ procedure for features detection in massive N-body simulations, leveraging state-of-the-art techniques from various fields. Based on a discrete-to-continuum paradigm shift, particles and their respective physical quantities are projected onto a 3D regular grid before applying image analysis algorithms to group voxels based on specific user-defined criteria. A significant extension to the hybrid parallelism of connected component analysis within the image processing community is also introduced in the present study. Traditionally operating in shared memory parallelism, this extension now incorporates both distributed and shared memory approaches. The implementation is carried out within the exaStamp classical Molecular Dynamics code, a variant of the open-source exaNBody platform (see section 6). This adaptation allows for the on-the-fly analysis of multi-billion atoms samples with at most a 1.3% overhead. In addition, the entire framework is benchmarked up to 32768 cores. The applicability of the present approach is demonstrated on the case of a spall fracture in a tantalum sample as well as high velocity impact of a tin droplets on a rigid surface.

Intelligent Predictive Networks for Cattaneo-Christov Heat and Mass Transfer Dissipated Williamson Fluid Through Double Stratification

This study aims to develop an efficient predictive model for Cattaneo-Christov heat and mass transformation of dissipative Williamson fluid with the effects of double stratification (CCHMT-DWF-DS) using the Levenberg-Marquardt Backpropagation (LMA-BP) algorithm. The under-consideration Williamson fluid flow is magneto-hydro-dynamic, incompressible and two-dimensional through a stretching sheet. The mathematical model of nonlinear partial differential equations for physical phenomena is transformed into ordinary differential equations by means of renowned similarity transformations. The solutions of physical problem are computed by bvp4c technique through MATLAB. The LMA-BP is employed to train a backward neural network capable of accurately predicting velocity, temperature, and concentration profiles under various physical conditions such as changes in the Hartmann number , Prandtl number , Schmidt number , Williamson parameter , the relaxation time of temperature , the relaxation time of concentration , temperature stratification , and concentration stratification for generating a variety of graphical outcomes and statistics. This research is significant for its innovative use of the LMA-BP in analyzing the complex dynamics of non-Newtonian fluids specifically the Williamson fluid, alongside the Cattaneo-Christov heat and mass flux model. The obtaining graphs have been discussed in detail. The thermal and solutal relaxation factors reduce heat and mass flow while fluid motion is delayed by the time-dependent parameter and further reduced by the Hartman number. The Cattaneo-Christov heat flux model enhances simulation accuracy by integrating temporal delays in heat transfer, proving beneficial for sophisticated industrial and scientific endeavors related to non-Newtonian fluids. This analysis offers a powerful predictive tool for applications in thermal management, industrial cooling systems, and biomedical fluid dynamics, advancing machine learning in fluid mechanics.

Identifying transdiagnostic and multidimensional prognostic indicators among veterans with PTSD symptoms in brief integrated care settings.

Brief integrated care settings hold promise for accessible and effective trauma-informed interventions. However, clinicians often have difficulty efficiently forecasting who is most appropriate for interventions in such settings and how to target individualized care. Multidimensional and transdiagnostic evaluations may provide valuable information to improve stepped-care and treatment practices for veterans. A middle-out approach was used to concurrently evaluate self-reported posttraumatic stress disorder (PTSD) symptoms, depressive symptoms, and physical health problems using cross-sectional (latent profile analysis) and longitudinal (latent growth mixture modeling) analyses that identified unique symptom profiles, trajectories of traumatic stress reactions, and correlates of these health outcomes. Data from 234 veterans who participated in a randomized controlled trial of primary care PTSD intervention were analyzed at 0, 8, 16, and 24 weeks. Latent profile analysis identified two homogenous baseline profiles: global symptoms (33.8%); low dysphoria-lower negative cognitions, mood, and depressive symptoms (66.2%). Low dysphoria participants reported more social relationships (OR = 1.32) and fewer environmental (OR = 0.89) and financial (OR = 0.23-0.35) stressors. Latent growth mixture modeling identified three trajectories: (a) reducing symptoms ("responders"; 21.3%) and chronic symptoms of (b) moderate (59.6%) and (c) high (19.1%) severity. Low dysphoria participants were 4.35 times more likely to be responders over time compared to participants with moderate severity symptoms. Findings indicated that veterans with moderate PTSD symptoms and physical health problems but low dysphoria may respond best to trauma-informed intervention in brief integrated care settings, while others may require further individualized stepped care. Findings demonstrate unique traumatic stress reactions that support individualized stepped care and may offer greater treatment utilization, retention, and efficacy. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

The Effectiveness of Pregnancy Exercise on Anxiety of Primigravida Mothers at The Galang Mother's Love Clinic

Congestion experienced by pregnant women can cause various negative impacts on their mental and physical health. High anxiety often contributes to mental disorders, such as depression, which can disrupt a mother's mood and emotional well-being. In addition, the stress response that arises from anxiety can result in physical problems, such as headaches, sleep disorders, and digestive problems, which ultimately impact the immune system. This study aims to assess the effectiveness of pregnancy exercise in reducing anxiety in primigravida mothers at the Kasih Ibu Galang Clinic. The method used was a quantitative study with a pretest-posttest design, involving 15 respondents who took part in a pregnancy exercise program for six weeks. Anxiety levels were measured before and after the intervention using an anxiety scale. The research results showed that the average anxiety level of respondents before participating in pregnancy exercise was 1.67, while after the intervention it decreased to 1.20. Statistical analysis produced a p-value of 0.029, which indicated a significant reduction in anxiety levels. These findings indicate that pregnancy exercise is effective in reducing anxiety in primigravida mothers, so it is recommended as an intervention to support mental health during pregnancy.

The impact of the multicomponent “Healthy and Vital” 3-month lifestyle intervention in health professionals: a single group pre-(multiple) post-study

BackgroundWorking in healthcare often involves stressful situations and a high workload, and many healthcare workers experience burnout complaints or suffer from mental or physical problems. This also affects the overall quality of health care. Many previous workplace interventions focused on knowledge exchange instead of other health cognitions, and were not particularly effective. Multicomponent lifestyle interventions may offer the potential in improving lifestyle and well-being of healthcare professionals. This study aims to evaluate the impact of a multicomponent lifestyle intervention “Healthy and Vital” for healthcare professionals on several health-related outcomes.MethodsA pre- (multiple) post-pilot study has been conducted using data from 2012 to 2018 to evaluate the lifestyle intervention in 126 female healthcare professionals. Measurements were conducted before, directly after the intervention (at 3 months), and 6 months after finishing the intervention (at 9 months). Participants filled out questionnaires and anthropometrics measurements were conducted by a dietitian. The intervention is based on the ASE-model, theory of planned behavior, and motivational interviewing techniques. The intervention included workshops related to stress, eating, sleep, and individual meetings with a dietitian. Multilevel linear mixed models with a random intercept and fixed slope were used to evaluate the impact on lifestyle self-efficacy, eating behavior, anthropometric outcomes and quality of life.ResultsImprovements were observed for lifestyle self-efficacy (total: beta= 1.32 95%CI 0.94;1.48, I know: beta= 1.19 95%CI 0.92;1.46, and I can: beta= 1.46 95%CI 1.19;1.73), eating behavior (emotional eating: beta=-0.33 95%CI-0.44;-0.23, external eating: beta=-0.35 95%CI -0.44;-0.26, and diet/restrictive behavior: beta= 0.41 95%CI 0.30;0.51), anthropometric outcomes (weight: beta=-5.03 95%CI -5.93;-4.12, BMI: beta=-1.873 95%CI -2.06;-1.41, waist circumference: beta=-6.83 95%CI -8.00;-5.65, and body fat percentage: beta=-1.80 95%CI -2.48;-1.17) and multiple outcomes of quality of life (physical functioning: beta= 4.43 95%CI 1.98;6.88, vitality: beta= 7.58 95%CI 4.74;10.42, pain: beta=4.59 95%CI 0.91;1.827, general health perception: beta= 7.43 95%CI 4.79;10.07, and health change: beta= 21.60 95%CI 16.41;28.80) directly after the intervention. The improvements remained after a six-month follow-up.ConclusionsMulticomponent interventions such as “Healthy and Vital” for healthcare professionals may be useful for improving the health of healthcare workers. More research using other designs with a control group, such as a stepped-wedge or RCT, is needed to verify our findings.Trial registrationRetrospectively registered on May 1 2024 at the Open Science Framework Registries (https://doi.org/10.17605/OSF.IO/Z9VU5).

Description of the Risk Falls in Elderly People in Cianjur Regency

Various health problems that occur in the elderly result from the deterioration of body cells, resulting in decreased function and endurance. One of the physical health problems that often occurs in the elderly is falls. The consequences of falls experienced by the elderly have psychological, sociological and emotional impacts and will result in physical injury, limited movement and death. This exercise program involves the balance center in the brain and increases the balance response so that it can reduce falls. The aim of this report is to provide an overview of the implementation of comprehensive nursing care for elderly people at risk of falling. Health services in the Cianjur area tend to encourage accelerated changes in the care environment in the health environment, one of which is through counseling services by nurses. Or the implementation of counseling by health workers. Community service activities with the topic Strengthening the Prevention of Fall Risk in the Elderly Age Group in Cianjur Regency is an effort to increase nurses' knowledge in supporting the acceleration of family health independence in Cianjur Regency, especially for the elderly. This research uses quantitative, descriptive methods. Sampling with total sampling. The total research sample was 37 elderly people accompanied by their families. Results: most of the elderly (78.5%) or 25 people were in the risk category for falls around the family. Meanwhile, 21.5% of elderly people are not at risk of falling or as many as 12 elderly people are not at risk of falling.

Solution of Well-known Physical Problems with Fractional Conformable Derivative

This paper presents a new definition of fractional derivatives and integrals through the conformable derivative approach. This innovative framework offers a closer alignment with classical derivative concepts while providing a more practical and intuitive basis for fractional calculus. The new definition is applicable in two primary ranges: 0 ≤ α < 1 and n − 1 ≤ α < n, where n is a positive integer. It is shown that when α = 1, this definition corresponds precisely to the classical first-order derivative. Key benefits of this approach include its improved consistency with traditional calculus and greater computational ease, making it a useful tool for both theoretical research and practical applications. By integrating fractional calculus with conventional derivative ideas, this definition simplifies the analysis and interpretation of fractional differential equations and their solutions. Additionally, we examine the definition’s effects on stability and convergence in numerical methods and provide examples demonstrating its effectiveness and applicability.

Mathematical model for heat transfer during underground coal gasification process

Purpose. To develop a mathematical model of the “coal-gas” medium heat transfer during underground coal gasification to predict the combustion face advance velocity and the duration of gasification column mining. Methodology. To detect the temperature fields in the coal seam and gas, depending on the displacement length of the phase transition boundary, a boundary-value problem of mathematical physics has been developed. To solve this boundary-value problem, Boltzmann transformations, as well as methods for solving ordinary differential equations, are used. Newton-Raphson method, which has quadratic convergence, is used to find the roots of the transcendental equation. Findings. Tendencies in the formation of mathematical models when studying temperature fields around an underground gasifier have been analyzed, with highlighting their disadvantages. A mathematical model of heat transfer during underground gasification has been developed, taking into account the phase transition boundaries of the “coal-gas” medium. A computational experiment was conducted to determine the temperature of the phase transition boundary based on the length of the gasification column and the duration of the process. Originality. A mathematical model for heat transfer during coal gasification in the form of a boundary-value problem of mathematical physics, which consists of parabolic heat-transfer equations, the Stefan condition at the phase transition boundary, and the Dirichlet boundary conditions, has been constructed. As a result of solving the boundary-value problem, a self-similar solution has been obtained for the distribution of the coal seam and gas temperature fields, as well as the position of the phase transition boundary depending on the gasification duration and on the medium density, thermal conductivity coefficients, specific heat capacity of gas and coal, specific calorific value and temperature of coal combustion, initial coal temperature and constant temperature of the gasification process. The conducted analysis of numerical calculations provides a deeper understanding of the dynamics of underground coal gasification process and makes necessary corrections to achieve the maximum process efficiency. Practical value. A methodology for determining the displacement length of the phase transition boundary of the “coal-gas” medium has been developed, taking into account the change in the combustion face temperature along the gasification zone length depending on the duration of this process. Application of the methodology makes it possible to predict the time of mining the gasified coal column for drawing up a calendar plan for mining operations.

On magnetohydrodynamics free convective flow within coaxial cylinder due to nonlinear thermal radiation in an isothermal/isoflux condition

A theoretical exploration was reported to highlight the electrically viscous conducting fluid within a coaxial cylinder. Both the outer surface of the inner cylinder and the inner surface of the outer cylinder were porous, heated, and cool, respectively. The action of a simultaneous radial transverse magnetic field and velocity slip were imposed across the coaxial cylinder. For appropriate insight into the physical problem, the thermal Rosseland diffusion approximation was used to indicate the radiative heat flux in the energy equation. The aim is to investigate the effects of isothermal and isoflux conditions on slip-upshot heat transfer in a vertical coaxial cylinder due to nonlinear thermal radiation. The steady-state and unsteady solutions of the physical problem were provided and solved via regular perturbation and implicit finite different domains, respectively. It was noted that the magnetic and suction parameters reduced the fluid velocity and skin friction under both isothermal and isoflux conditions. Conversely, the Grashof number, thermal radiation, and injection parameters increased the fluid velocity, fluid temperature, and skin friction, with a more significant effect observed under isothermal conditions on the surfaces of the coaxial cylinder. Additionally, the sensitivity analysis revealed that the radiation parameter is highly sensitive under isothermal conditions, followed by the temperature difference parameter. In contrast, under isoflux conditions, the injection parameter shows extreme sensitivity, with the radiation parameter being the next most sensitive. The result reveals an excellent agreement between the analytical and numerical results at maximum time.

Superradiant phase transitions in ultrastrong coupling regime

Abstract One of the long-standing problems in quantum optics and laser physics is the observation of both equilibrium and non-equilibrium (Dicke) superradiant states in two-level (qubit) systems interacting with the quantized electromagnetic (EM) field. We demonstrate that the superradiant phase transition (PT) at thermal equilibrium in such a system is close to ultrastrong light–matter coupling (USC) condition, which is currently available for superconducting devices. We examine the USC regime for EM fields interacting with two-level systems located in highly connected graph nodes of photonic networks beyond the rotating wave approximation. We find that a critical matter–field coupling parameter reduces ⟨ k ⟩ times due to network peculiarities providing suitable conditions for equilibrium PT observation; ⟨ k ⟩ is a network average node degree. We study the non-equilibrium (Dicke) superradiance for the same network system and show that superradiance appears as a non-equilibrium PT to the superradiant laser operating within a bad cavity limit. We show that population inversion in this case plays the same role as the reciprocal temperature inherent to the equilibrium superradiant PT. Our results open new perspectives for experimental observation of superradiance in cavity-free systems in the gigahertz photonic regime and beyond.

Joint Effect of Velocity Slip and Joule Heating MHD Casson-Williamson Nanofluid Passes Through the Stretching Porous Medium

The objective of this study is to examine the heat and mass transport characteristics of a non-Newtonian Casson-Williamson nanofluid flow over a porous stretching sheet. The viscoelastic characteristic of a fluid is obtained by combining Casson and Williamson fluids. It is anticipated that the porous media through which the non-Newtonian fluid flows will adhere to Darcy's law. The effects of magnetic and electric fields are taken into account. The mathematical modeling of this physical problem involves a set of nonlinear partial differential equations that are mass, energy and momentum, together with corresponding boundary conditions, these PDEs are transformed into dimensionless ODE by appropriate similarity transformations and solved by R-K method. The numerical analysis is subsequently presented in a visual format to illustrate the influence of different controlling parameters on velocity, temperature, and concentration. Moreover, the analysis gives higher values of magnetic, viscous dissipation and joule heating parameters leads the temperature and Nusselt number. Conversely an increasing in mixed convection parameter result in a depreciation in the temperature. The skin-friction coefficient exhibited an upward trend with an increase in the porosity parameter. The rate of heat transfer demonstrated a rise under the Joule heating conditions. These findings are compared to other recorded results for a specific situation, then displayed graphically and analyzed in terms of engineering and industrial implications. Novelty this paper is by adding joule heating to nanofluid control over heat dissipation, thermal stability, or enhanced efficiency in heat exchange applications.

The effect of OMO learning on high school students' problem-solving skills in physics

Online-merge-offline (OMO) learning in a hybrid learning space is becoming a popular pedagogy to enhance students' blended learning using appropriate technology. This investigation delves into the impact of OMO learning on developing physics problem-solving skills among high school students. A ten-week intervention employing OMO learning is implemented with 34 participants in both the experimental and control groups at a high school in Hangzhou, China. The efficacy of OMO learning is assessed through a quasi-experimental design encompassing pre- and post-assessments. The findings of this inquiry reveal: (1) The experimental group's physics problem-solving abilities are significantly impacted by OMO learning; (2) the use of cognitive tools rationally, the integration of online and offline collaborative learning, rich learning resources, and heuristic teaching all help students become more adept at solving physics problems; and (3) the cognitive load, students' lack of prior knowledge, poor self-regulation, and lack of help-seeking techniques all work against the improvement of students' physics problem-solving abilities. Suggestions are made in line with the research results and aims.

Quantifying the Expanding and Cooling Effects into the Double Adiabatic Evolution of the Solar Wind Through the Expanding Box Model

One of the fundamental problems in space physics is the expansion dynamics of the solar wind, strongly correlated with collective plasma reactions, such as wave instabilities that tend to relax kinetic anisotropies. The expansion is in general described through the double adiabatic or Chew–Goldberger–Low (CGL) theory, which sets the main ideas and plasma expansion’s major role in describing plasma cooling/heating dynamics. Here, using the expanding box model (EBM) we revisit the CGL description including plasma expansion. Our primary objective is to isolate the expanding effects into the conservation of the double adiabatic invariants, a key aspect of the CGL theory. Following the same approximations and assumptions as in EBM and CGL theory, we developed a CGL-like description in which the expansion modifies the conservation of the double adiabatic invariants. Our results show that the double adiabatic equations are no longer conserved if plasma cooling is introduced through the EBM, with explicit dependence on expanding parameters, magnetic field profiles, and velocity gradients. Solving the equations for different magnetic field and density profiles (obtained self-consistently through the equations), we compute the evolution of temperature anisotropy and plasma beta, which deviates from CGL predictions and empirical observations. This deviation is attributed to the plasma cooling effect induced by the expansion of the plasma. The results suggest that heating mechanisms even play a major role in counteracting plasma cooling during expansion.

A Lifeline to Fill the Silence of Homelessness: Person-Centered Analysis of Digital Coping and Links to Mental and Physical Health.

Individuals experiencing homelessness are among the most vulnerable population for mental and physical health disparities. Despite navigating numerous stressors on a day-to-day basis, they are vastly underrepresented within coping research. Using a person-centered approach, this study addresses ways in which technology is leveraged to manage ongoing stressors associated with the experience of homelessness. We employed a two-step and k-means cluster analysis within a sample of unhoused individuals (n = 66). Two distinct clusters emerged, revealing unique patterning of digital coping, stress, self-efficacy, and technology use. Resulting clusters were validated across numerous health outcomes, including mental and physical health problems, as well as digital service use and experience of homelessness. High digital engagement/low self-efficacy individuals (65% of sample) reported high levels of digital self-efficacy, yet lower levels of general self-efficacy. In contrast, low digital engagement/high self-efficacy individuals (35% of sample) engaged in relatively lower digital coping and technology use, with lower stress and higher general self-efficacy. High digital engagement/low self-efficacy individuals, in turn, reported more mental and physical health problems; whereas low digital engagement/high self-efficacy reported somewhat decreased digital access. Relatively few differences emerged between the clusters on experiences of homelessness. Due to the transient nature of unhoused people, reaching such vulnerable populations via technology to support their digital coping and subsequently enhance well-being outcomes represents a critical next step for digital equity. This population is poised to benefit from digital equity efforts, with critical implications for reduced health disparities.