Mixed Design Research Articles

Predicting compressive strength of quarry waste-based geopolymer mortar using machine learning algorithms incorporating mix design and ultrasonic pulse velocity

ABSTRACT The current study aimed to investigate the possibility of predicting the compressive strength of geopolymer mortar by mix design parameters, ultrasonic pulse velocity (UPV) and machine learning techniques. Here the geopolymer mortar is produced from eggshell ash and rice husk ash as precursors, NaOH solution as activator and quarry waste as fine aggregate. Twenty-seven combinations of geopolymer mix and a total of 189 mortar cubes were cast and tested for UPV and compressive strength. Seven different machine learning techniques were used to predict the compressive strength assessment tools: linear regression, artificial neural networks, boosted tree regression, random forest regression, K-Nearest Neighbor, support vector regression and XGboost. Among the diverse machine learning models evaluated in this study, XGboost exhibited remarkable efficacy in forecasting the compressive strength of geopolymer mortar. The investigation conducted using SHAP indicates that the concentration of UPV shows the most substantial influence on the prediction of compressive strength.

Early age hydration behaviour of foam concrete containing a coal mining waste: novel experimental procedures and effects of capillary pressure

Globally, coal mining wastes (CMWs) are associated with significant environmental and economic costs. Processing CMW into an ingredient of foam concrete is a promising solution but the behaviour of this particular construction material has not been sufficiently evaluated, especially during the initial period of cement hydration. The purpose of this paper is to present novel laboratory set-up and experimental procedures designed to investigate the early age behaviour of hydrating foam concrete samples made with a CMW from Poland. Two types of tests were devised to simulate air-curing conditions and water-curing conditions, respectively. These tests were carried out in custom-built unsaturated oedometer cells, and the matric suction in the test samples was monitored for approximately 14 days, using Warwick high capacity tensiometers. Experimental results show that in both curing conditions, a higher matric suction during cement hydration corresponds to a denser sample at the end of the monitoring period. A comparison of water-cured and air-cured samples also reveals different responses to CMW inclusion in their mix designs. The responses can be convincingly explained based on complementary test data and idealised capillary tube models adapted for the hydrating foam concrete samples.

A Study on the Impact of Psychosocial Factors on the Nature and Incidence of Suicide among Adolescent Students

ABSTRACT Adolescence is a time for existential confrontations and at this stage, the adolescent is philosophical, and often thinks of death in more abstract terms. This research is a study on the impact of psychosocial factors on the nature and incidence of suicide among adolescent students. The study was conducted using The Students Stress Inventory, Hamilton Anxiety Rating Scale (HAM-A), The Learned Helplessness Scale and The Suicide Behaviour Questionnaire Revised (SBQ-R) on a group of 10 male and female adolescent students whose age ranged from 13 to 17 years. The mixed research design was adopted using quantitative and qualitative analysis. The research findings reveal that all subjects of the group had moderate levels of stress, anxiety and helplessness. The students who participated in the study demonstrated suicidal ideation and behaviour. The correlation between stress and anxiety with suicide risk behaviour was high for the group of students. It is found that there was a low correlation between feelings of helplessness and suicide risk behaviour. The reports of the students who participated in the study throws light on social, economic and academic pressures which create stress and could make them contemplate attempting suicide.

The Family Talk Intervention in Pediatric Oncology: Potential Effects Reported by Parents.

Childhood cancer impacts the family system and has psychosocial consequences for all family members. For the parents, the ill child, and the siblings to be able to adjust to this challenging situation, the whole family needs access to psychosocial support. However, only a few such family interventions in pediatric oncology have been evaluated. The aim of this study was to explore the potential effects of a family-centered intervention, the Family Talk Intervention (FTI), in pediatric oncology from the parents' perspectives. A concurrent mixed methods design was used for this study. Data were derived from a pilot study of 26 families recruited from one pediatric oncology center in Sweden. This study focused on questionnaire and interview data from 52 parents. After participation in FTI, the parents felt more satisfied with the conversations within the family about the illness. FTI also contributed to strengthened family togetherness, including more open communication and improved family relations, as described by the parents. Parents further expressed that they felt more empowered in their parenting role following FTI. The findings regarding FTI's ability to improve family communication and family relations, thus strengthening family togetherness in families with childhood cancer, are promising. This provides motivation for a large-scale study of FTIs in pediatric oncology.

Influence of School Environment on Physics Teacher Effectiveness in Kigezi Sub-Region, Uganda

This study investigated the influence of school environment on physics teacher effectiveness in secondary schools in Kigezi Sub-region, Uganda. The focus of the study was to establish the influence of administrative support on physics teacher effectiveness; to establish the influence of collegiality of teachers on physics teacher effectiveness and to find out the influence of professional development like workshops, seminars on physics teacher effectiveness. This study employed both quantitative and qualitative techniques to collect and sequentially analyse the data. The study adopted a mixed research design on a sample of 234 physics teachers, fourteen (14) head teachers and six (06) education officials. Data were collected using a self-administered questionnaire, interview guide, focus group discussions and classroom environment checklist. Quantitative data was analysed through the statistical software programs SPSS and SPSS AMOS while qualitative data was analysed using content analysis and verbatim quotations. Descriptive analysis showed that the school environment highly influences physics teacher effectiveness in all aspects. The results of structural equation model (SEM) showed that the school environment influences teacher effectiveness. The findings showed that the school environment as conceptualised as administrative support, collegiality and professional development had a strong positive influence on teacher effectiveness. It was concluded that teachers should create appropriate environment to present new thoughts by creating standards of administrative support, exercise companionship and cooperation between colleagues. Finally, develop professionally and remain relevant with current skills by participating in activities like educational seminars, workshops, and conferences

A Sustainable Approach Using Beef and Pig Bone Waste as a Cement Replacement to Produce Concrete

Owing to the ongoing accumulation of industrial by-products, the management and disposal of waste have emerged as a significant issue. Employing these industrial wastes as an alternative to replace cement holds potential as a promising solution for conserving energy and reducing CO2 emissions. In this study, pig and beef bone powder were used as cement replacements in concrete, and the mechanical properties were studied. Bone powders were prepared from random bones collected from local slaughterhouses, butchers, and restaurants. The pig bone powder (PBP) and beef bone powder (BBP) were prepared by direct fire contact, oven-calcined for 4 h at 300 °C, crushed, and sieved to size 0.4 to 2 mm. A concrete mix design was formulated for a target compressive strength of 21 MPa at 28 days of curing. This design included three different levels of cement replacement with each type of bone powder (10%, 15%, and 20% by mass). These mixes were then evaluated and compared to a control mix without any bone powder replacement (PB-0). This study evaluated the mechanical properties via compressive strength and flexural testing. The results showed that the workability of the mixtures decreased with the increase in bone powder content. Bone powder functions as a pozzolanic substance, engaging in a chemical reaction with the calcium hydroxide in concrete to produce compounds that exhibit cement-like properties; however, an increase in bone powder content worsened the mechanical properties. The most promising results were obtained for a 10% replacement percentage of BBP and PBP, obtaining strengths of 21.15 MPa and 22.78 MPa, respectively. These are both above the design strength, with PBP concrete even exceeding the strength of PB-0 (21.75 MPa). These results showed a good agreement with the standard values and allow to use these wastes as a replacement for cement, becoming a sustainable solution to the exploitation of quarry materials and, in turn, to the problem of contamination by biological waste from the meat industry.

Protocol of a mixed method research design to study medical respite programs for persons experiencing homelessness.

Medical Respite Programs (MRPs) characterize a care model that has been developed to address the health care and social needs of persons experiencing homelessness by providing post-acute hospital care in a safe environment. Although this model has been shown to reduce hospitalizations, improve health outcomes and increase access to health services, prior studies of MRP programs and outcomes have been limited to individual sites and may not generalize to the population of individuals receiving MRP care. This study protocol describes a mixed method design to collect organizational, provider, and patient-level data from a sample of MRPs.

A Mixed Reality Design System for Interior Renovation: Inpainting with 360-Degree Live Streaming and Generative Adversarial Networks after Removal

In contemporary society, “Indoor Generation” is becoming increasingly prevalent, and spending long periods of time indoors affects well-being. Therefore, it is essential to research biophilic indoor environments and their impact on occupants. When it comes to existing building stocks, which hold significant social, economic, and environmental value, renovation should be considered before new construction. Providing swift feedback in the early stages of renovation can help stakeholders achieve consensus. Additionally, understanding proposed plans can greatly enhance the design of indoor environments. This paper presents a real-time system for architectural designers and stakeholders that integrates mixed reality (MR), diminished reality (DR), and generative adversarial networks (GANs). The system enables the generation of interior renovation drawings based on user preferences and designer styles via GANs. The system’s seamless integration of MR, DR, and GANs provides a unique and innovative approach to interior renovation design. MR and DR technologies then transform these 2D drawings into immersive experiences that help stakeholders evaluate and understand renovation proposals. In addition, we assess the quality of GAN-generated images using full-reference image quality assessment (FR-IQA) methods. The evaluation results indicate that most images demonstrate moderate quality. Almost all objects in the GAN-generated images can be identified by their names and purposes without any ambiguity or confusion. This demonstrates the system’s effectiveness in producing viable renovation visualizations. This research emphasizes the system’s role in enhancing feedback efficiency during renovation design, enabling stakeholders to fully evaluate and understand proposed renovations.

Compensatory behavior of physical activity in adolescents – a qualitative analysis of the underlying mechanisms and influencing factors

IntroductionCompensatory behavior of physical activity (PA) based on the ActivityStat hypothesis in adolescents is scarcely investigated, and existing studies showed inconclusive results. Understanding the compensatory behavior in a holistic way is important as this can help to improve intervention outcomes and thus, increase the PA levels in adolescents. Thus, the aim of the present study is to investigate the occurrence, direction, timeframe, and ratio of habitual activity compensation in adolescents. Furthermore, we want to identify the awareness of compensation and factors that influence compensatory behavior.MethodsThe present qualitative study used a mixed methods crossover analysis design. Participants (N = 15, 8 boys and 7 girls) were adolescents aged 11–15 years (mean age 13.04 ± 1.28). They provided a habitual weekly schedule with habitual/regular activities and their intensity. Participants then kept an activity diary over one week to capture their actual behavior. After that, data were compared and deviations > ±20% were considered as compensation opportunities. On this basis, deviations were descriptively analyzed for compensatory behavior and were coded as positive and negative compensatory behavior. Further, for each compensation, the ratio of compensation (MET-minutes of the compensating activity/MET-minutes of the activity that was compensated) was calculated. Additionally, interviews were conducted to explore perceptions and influencing factors for (no) compensation.ResultsOverall, 198 compensation opportunities were identified with deviations greater ± 20%. Of these, 109 opportunities were compensated overall (69 within-day, 40 between-day). Negative compensation took place in 57 opportunities and 52 opportunities were compensated positively. Most of the deviations were overcompensated (compensation/deviation > 100%). About half of the adolescents (N = 8) were not aware about their compensatory behavior, and only one boy was aware of all his compensatory behavior. The most mentioned influence for positive compensation were social support by friends and good weather. As influencing factors for negative compensation, tiredness as well as no need for movement were mentioned predominantly. No negative compensation occurred because adolescents wanted to stick to their routines or participated in hedonistic activities.DiscussionSummarizing the findings, the present study delivered new insights into the field of compensatory behavior in adolescents. Nevertheless, compensatory behavior was not consistently observed regarding the occurrence of compensation, direction, timeframe and ratio. However, social support appears to be an important factor to compensate positively or to avoid a negative compensatory behavior. Further, it seems to be helpful to support individuals in their search for hedonistic activities as well as in the establishment of routines.

A multidimensional strategy to managing dysfunctional breathing and exercise-induced laryngeal obstruction in adolescent athletes

BackgroundExercise induced laryngeal obstruction (EILO) causes inspiratory distress in the upper airway in many adolescent athletes. The nature of EILO is not fully understood, and effective management strategies are lacking. This study aimed to assess the effectiveness of a multidimensional individually tailored intervention, including Norwegian Psychomotor Physiotherapy (NPMP), elements of cognitive behavioural therapy and a rehabilitation plan, in reducing inspiratory distress and dysfunctional breathing in adolescent athletes with EILO.MethodsA mixed methods design, which combined qualitative and quantitative research, was used. Data, including subjective experiences of respiratory distress, findings from body examinations and objective measurements of lung function and aerobic capacity were gathered before and after a five month intervention involving 18 participants.ResultsFollowing the intervention, the participants showed a reduction in respiratory distress and anxiousness associated with their breathing difficulties. Furthermore, the participants reported to be more in control of their breathing. The body assessments revealed a more functional breathing motion and improved posture, which imply that the breathing was less thoracic and more diaphragmatic in rest and exercise in all participants after the intervention.ConclusionsOur results suggest that a multidimensional individually tailored intervention, including NPMP based physiotherapy, cognitive behavioural therapy elements, and a rehabilitation plan may reduce inspiratory distress and dysfunctional breathing in athletes with EILO.Trial registrationClinicalTrials.gov Protocol Registration and Results system NCT06033755, date of registration: September12, 2023. Retrospectively registered.

Performance of cement mortar mixes containing fine reclaimed asphalt pavement aggregates and zinc waste

Cement mortar mixes were prepared to test the suitability of fine reclaimed asphalt pavement (FRAP) aggregates as a replacement for natural fine aggregates (NFA). With different amounts of NFA (25%, 50%, 75% and 100% by weight) replaced with FRAP aggregates, the mechanical qualities of the mortar mix deteriorated. To counteract this, jarosite – a waste from the zinc industry – was used as a partial replacement for cement (replacements of 5%, 10% and 15%). The jarosite improved the microstructural, mechanical and shrinkage properties. For example, compared with the control mix (100% NFA), the mix containing 25% FRAP aggregates showed a 5.5% reduction in hardened density and a 14% reduction in compressive strength. With the addition of 10% jarosite, there was an increase of 4.85% in hardened density and 7% in compressive strength with respect to the mix containing 25% FRAP aggregates. It is thus suggested that 10% jarosite is used when FRAP aggregates are used to make cement mortar mixes. A cost analysis was also performed. The findings of this work are expected to inspire rational mix design recommendations for mortar mixes including FRAP aggregates, as well as bringing environmental and economic benefits by reducing carbon dioxide footprints.

The Sukaribit Smartphone App for Better Self-Management of Type 2 Diabetes: Randomized Controlled Feasibility Study.

A new app, Sukaribit, was designed to enable contact between the caregiver and the patient with the intent to improve self-care and glycemic control (hemoglobin A1c [HbA1c]). This study investigated the feasibility of the study methodology and the intervention in preparation for a larger effectiveness study. Adults with type 2 diabetes were recruited in this randomized controlled feasibility study with a mixed methods design. The intervention group (n=28) tried Sukaribit for 2 months. They were encouraged to report blood glucose levels and medications, and they received feedback from a physician. The control group (n=31) received standard care. Both groups were evaluated with pre and postmeasurements of glycemic control (HbA1c), diabetes distress, physical activity, and self-care. Feasibility was evaluated against 5 progression criteria regarding recruitment, study methods, and active participation. Of the 5 progression criteria, only 2 were met or partially met. The recruitment process exceeded expectations, and data collection worked well for self-reported data but not for HbA1c measured with a home testing kit. The participants were less active than anticipated, and the effect sizes were small. Only the number of blood glucose tests per day was positively affected by the intervention, with 0.6 more tests per day in the intervention group. Recruitment of participants to a future fully powered study may work with minor adjustments. The collection of HbA1c using home testing constituted a major problem, and an alternative strategy is warranted. Finally, the app was not used as intended. In order to proceed with a larger study, the app and study procedures need improvement.

Research note: Evaluating the efficacy of an online post event reflection tool in competitive sport

In competitive sport environments, coaches and sport psychology practitioners work to optimize individual and team performance. One strategy identified as a key to optimal sport performance is athlete self-awareness. This study evaluated the efficacy of a novel, online post-event reflection (PER) tool. Using a mixed methods design, 22 members of a competitive women’s ice hockey team completed the PER across one season. The PER demonstrated efficacy through tailored insight used as a basis for athlete discussions, complementing other performance-related feedback. Follow-up interviews with three team members and the head coach provided additional support for the efficacy of the PER. Lay summary: In competitive sport environments, coaches and sport psychology practitioners work to optimize individual and team performance. This study provides evidence to support the use a novel, online post-event reflection tool by athletes, coaches, and sport psychology practitioners to enhance athlete self-awareness of mental skills and performance.

“Nature Environments Without Actually Being There”: Virtual Recreation Experiences and Real-World Intentions

Background: Despite access to nature-based recreation, many college students do not take advantage of these experiences to improve their mental and physical health. Virtual reality experiences provide a potential pathway to motivate this population to recreate outdoors, but research is needed to determine whether virtual recreation can lead to real-world intent to recreate. Purpose: This study investigated whether virtual reality experiences influence student motivation for nature-based recreation, as measured with the intention and self-efficacy to spend time in nature scales. Methodology/Approach: As part of an introductory parks, recreation, and tourism class, students explored nature through virtual reality. The study incorporated a mixed methods design using pre- and post-experience surveys, interviews with participants, and document analysis of student assignment submissions over Instagram. Findings/Conclusions: Preliminary findings suggest that virtual reality can approximate real-world nature environments and provide a potential pathway for this population to access real-world outdoor recreation opportunities. Implications: In situations where real-world field experiences are not possible, educators and practitioners can use the findings of this study to assess whether a virtual recreation experience is appropriate for their audience. While these experiences do not substitute real-world nature, they may be part of a participant’s pathway to recreate outdoors.

EFL Learners’ Participation in Primary Schools of Coastal Areas in Bangladesh

Despite numerous initiatives by both governmental and non-governmental organizations, primary level students’ skills in English language are still below the expected level in Bangladesh (Hamid & Honan, 2012; Sultana, 2010). Our study examined reasons behind the limited participation of EFL (English as a Foreign Language) learners in primary level classrooms in the coastal areas of Bangladesh. To conduct the research, we followed an explanatory sequential mixed methods design (Creswell, 2014; Creswell & Creswell, 2018; Ivankova & Stick, 2007). We collected data from 37 male and 23 female students in grades four and five through questionnaire surveys and three focus group discussions (FGDs). We also collected data from five teachers through interviews and three class observations. We found that teachers had less motivation to create an interactive learning environment for the students due to heavy teaching loads and administrative assignments. Many of the students had low academic expectations and motivation, lived in poor socio-economic conditions that required them to work, and were impacted by frequent natural disasters that interrupted their regular classes. The results of our research provide insights for educationists and policymakers related to primary education in disaster-prone coastal areas as well as other rural parts of the country.

Creation of an instrument for pediatric mental health in indigenous people: A participatory design

Indigenous communities represent a population group with multiple vulnerabilities that are exacerbated in low- and middle-income countries. The group of children and youths faces exposure to adverse living conditions that add to the complexity of the values and meanings they give to life, well-being, and health, especially mental health. In this sense, it is essential to find culturally sensitive approaches for the recognition of such meanings from mental health and its aspects of affectation. Therefore, we sought to describe a methodological process of co-construction and cultural approach with indigenous communities of an early detection instrument for mental disorders and spiritual disharmonies in childhood and youth. This study corresponded to the qualitative phase of a sequential, contextual mixed methods design, based on moments from the implementation of a Participatory Action Research methodology. It was found that collaborative processes of cultural approach in research allow for more precise knowledge of special importance for the recognition of alterations in mental health, which is also reflected in better processes of understanding needs, desires, and possibilities in mental health and that in turn allows for the development of timely actions of recognition and accompaniment. It is necessary to continue with the development processes of culturally appropriate methodologies for mental health research in indigenous communities.

Exploring the Impact of Gender Bias Among Medical Trainees.

Research has suggested that health care providers are not immune to implicit and explicit gender bias among their own colleagues and in the treatment of patients. To date, limited research examines gender bias in trainees and how that bias might intersect with patient care. Our study focused on gendered expectations, perceived competence of medical providers, and perceived acceptability of patients who advocate for themselves. We used a 2x2x2x2 mixed design to examine the impact of participant gender, type of physical exam (vaginal vs elbow), trainee status, and gender of vignette physician. Participants read and responded to vignettes depicting various standardized clinical scenarios. The complete sample included 342 participants from a rural medical teaching hospital and a private liberal arts college in the same geographic region. Findings suggested a significant interaction between physicality and gender of the participant on perceived competence. Although males and females had similar ratings of competence on an exam with low physicality (elbow), the data suggested that males did not recognize how errors during clinical practice may impact a hypothetical female patient. Future research might examine interventions that aim to increase awareness of gender bias among medical trainees and to explore whether interventions might improve patient care and perceptions of competence following identified errors.

Noisy condition and three-point shot performance in skilled basketball players: the limited effect of self-talk.

In modern basketball, the three-point shot plays an important tactical role. Basketball players often face the distraction from audience and opponents, necessitating psychological skill to maintain their performance. The study examined the effects of self-talk interventions on the three-point shot performance under quiet and noisy conditions. It involved 42 national second-level basketball players and used a 2 (Condition: quiet condition, noisy condition) × 3 (Intervention: control group, motivational self-talk, instructional self-talk) mixed design to investigate the performance of the static and dynamic three-point shots tasks. The results revealed that the static three-point shot score was significantly lower in noisy condition compared to quiet condition (p = 0.016), while the main effect of Intervention and the interaction effect of Condition × Intervention were not significant. Post-hoc analysis indicated that only the control group showed significantly lower scores in the noisy condition (p = 0.043). For the dynamic three-point shots performance, there were no significant main effects of Intervention or Condition, nor any significant interaction effect between Condition and Intervention. In conclusion, noise distraction negatively affects the static three-point shots task, and although self-talk interventions can mitigate such negative effects, their effectiveness is limited for dynamic three-point shots task with high physical demands.

The combination of oxytocin and mindfulness-based group therapy for empathy and negative symptoms in schizophrenia spectrum disorders – A double-blinded, randomized, placebo-controlled pilot study

Treatment options for social cognition and negative symptoms in schizophrenia spectrum disorders (SSD) remain limited. Oxytocin could be a promising augmentation approach, but the social context influences the effect in humans. This pilot study hypothesized that oxytocin in a positive social setting through mindfulness-based group therapy (MBGT) would positively affect empathy and negative symptoms as well as affect and stress in an exploratory approach in SSD. An experimental, randomized, double-blinded (participants, psychotherapists), placebo-controlled pilot study with 41 individuals with SSD was conducted at the Charité – Universitätsmedizin Berlin. Oxytocin or placebo (24 I.U.) was administered intranasally 45 min before two sessions of MBGT each. A 2 × 2 mixed model ANCOVA design was calculated to assess empathy by the Interpersonal Reactivity Index and the Multifaceted Empathy Test and negative symptoms by the Self-Evaluation of Negative Symptoms. No benefit of oxytocin compared to placebo on empathy was observed, but significant between-group differences favoring oxytocin were found regarding the negative symptoms Diminished emotional range and Avolition. Negative affect and stress were significantly reduced compared to baseline. Mindfulness increased in both groups. Results indicated protocol adherence and retention rate of 91.1%, a drop-out rate of 8.9 % and a completion of 96 % of all sessions by the participants. No severe adverse events or side effects were reported. Our findings indicate proof-of-concept and suggest a potential role of oxytocin on negative symptoms and related variables in SSD in combination with MBGT. Future research should examine the stability of these effects with larger sample sizes.

Linguistic Characteristics of Research Article Titles in National and International ELT Journals

Researchers have extensively studied the linguistic characteristics of research article (RA) titles. However, no research has investigated RA titles viewed from research design types published in national and international English Language Teaching (ELT) journals. Thus, the present study aims to fill this gap by investigating the average word length, syntactic structure, and syntactic structure type based on research design. This study used a comparative mixed method design to analyze 120 RA titles published in 2022-2023. The average length of titles was analyzed by counting the parts of speech of the tiles, the syntactic structures of titles were analyzed using the Framework of Cheng et al. (2012), and syntactic structure types based on research design were analyzed by reading the method section of the articles. Results indicate that the average length of the RA titles was 12 words in national journals and 13 words in international journals. Nominal structure was the most used RA title type in national journals, while compound structure was the most used in international journals. Furthermore, the nominal structure was often used for experimental design in international journals, while it was often used for descriptive study design in national journals. The compound and Verb-ing phrase structures were often used for case study design in both international and national journals. In conclusion, there are important differences and similarities in RA title characteristics between the two groups of ELT journal rankings. The findings contribute to the scholarship on the contrastive aspect of titling practices in English for Publishing Purposes.