Search Results (25,519)

The demand for science, technology, engineering, and mathematics (STEM) skills has been consistently increasing due to technological advancements and globalization, making STEM education and teacher training a critical priority. Although many national and international initiatives have been implemented to strengthen STEM education and raise the attractiveness of the teaching profession, a shortage of teachers in general, and STEM teachers in particular, is still evident across Europe. This study aimed to identify factors contributing to attracting existing and potential teachers to careers in STEM education. Qualitative research methods were employed to study teachers’ perceived motivation, challenges, and suggestions regarding STEM teachers’ careers, competence, and collaboration development. The study revealed that the practical application of competence development initiatives significantly motivates STEM teachers, emphasizing the importance of aligning professional development with classroom implementation. These results emphasize the importance of prioritizing practical, classroom-oriented professional development and fostering a culture of collaboration in educational institutions. Full article

Juvenile grey seals are known to be highly social, interacting with contact behaviours interpreted as gentle play. However, minimal sociality of pups with their mothers and among weaned pups has been suggested. The present study aimed to observe the natural social interactions of pups to track the early ontogeny of their sociality. Pup behaviour at a salt marsh colony on the east coast of England was video-recorded. Pups interacted with their mothers around suckling bouts and after weaning as they gathered around pools. The records were transcribed to spreadsheets in 30 s time segments to estimate the frequency and co-occurrence of different behaviours. Mother-pup interaction comprised nosing contacts and sometimes contact play, involving one laying the head and fore-flipper over the other. Initial weaned pup encounters involved tentative nosing and defensive splashing, indicating contact shyness. However, socially orientated locomotor play, supine posturing, and exaggerated raising of fore- and hind-flippers led to reduced shyness and pups following one another towards the sea. Archive data on subadult interactions and on harbour seal behaviours were re-analysed. Gentle play-like contact between mother–pup, juvenile, and adult pairs is interpreted here as a universal mode of social bonding, underscoring the social structure of both grey and harbour seals. Full article

A robust AR-DSNet (Augmented Reality method based on DSST and SiamFC networks) tracking registration method in complex scenarios is proposed to improve the ability of AR (Augmented Reality) tracking registration to distinguish target foreground and semantic interference background, and to address the issue of registration failure caused by similar target drift when obtaining scale information based on predicted target positions. Firstly, the pre-trained network in SiamFC (Siamese Fully-Convolutional) is utilized to obtain the response map of a larger search area and set a threshold to filter out the initial possible positions of the target; Then, combining the advantage of the DSST (Discriminative Scale Space Tracking) filter tracker to update the template online, a new scale filter is trained after collecting multi-scale images at the initial possible position of target to reason the target scale change. And linear interpolation is used to update the correlation coefficient to determine the final position of target tracking based on the difference between two frames. Finally, ORB (Oriented FAST and Rotated BRIEF) feature detection and matching are performed on the accurate target position image, and the registration matrix is calculated through matching relationships to overlay the virtual model onto the real scene, achieving enhancement of the real world. Simulation experiments show that in complex scenarios such as similar interference, target occlusion, and local deformation, the proposed AR-DSNet method can complete the registration of the target in AR 3D tracking, ensuring real-time performance while improving the robustness of the AR tracking registration algorithm. Full article

We review the evolution of our understanding of the planetary nebulae phenomenon and their place in the scheme of stellar evolution. The historical steps leading to our current understanding of central star evolution and nebular formation are discussed. Recent optical imaging, X-ray, ultraviolet, infrared, millimeter wave, and radio observations have led to a much more complex picture of the structure of planetary nebulae. The optically bright regions have multiple shell structures (rims, shells, crowns, and haloes), which can be understood within the interacting winds framework. However, the physical mechanism responsible for bipolar and multipolar structures that emerged during the proto-planetary nebulae phase is yet to be identified. Our morphological classifications of planetary nebulae are hampered by the effects of sensitivity, orientation, and field-of-view coverage, and the fraction of bipolar or multipolar nebulae may be much higher than commonly assumed. The optically bright bipolar lobes may represent low-density, ionization-bounded cavities carved out of a neutral envelope by collimated fast winds. Planetary nebulae are sites of active synthesis of complex organic compounds, suggesting that planetary nebulae play a major role in the chemical enrichment of the Galaxy. Possible avenues of future advancement are discussed. Full article

The COVID-19 pandemic and the racial justice uprisings of 2020–2022 created an altered and challenging landscape for teaching public health. Challenging and direct experiences with these public health issues and their reverberations shaped how some faculty and many students participated in both online and in-person classrooms. In this project, we conducted a narrative analysis of oral history interviews with eight faculty members at a public university in New York City to understand how they reacted to these events and reconsidered their public health teaching during this period. We map what propelled faculty along paths of change and where these paths led. We learn that participating faculty shifted in varied ways toward more intentional and sometimes more antiracist teaching practices. Two experiences were foundational to these shifts: (1) faculty attunement to student realities during this time, and (2) faculty reflection on their own social positionings (i.e., race, gender identity, sexual orientation, class, age, immigration status, etc.) and their development of critical consciousness. These findings provide insights into how faculty conceptualize, support, and change their teaching approaches during periods of upheaval, particularly in the context of limited institutional support for faculty development. Finally, we discuss key issues for institutions seeking to formalize and enhance shifts like those described. Full article

Aluminium alloys are used for the fabrication of the fuel clad of research-grade nuclear reactors as well as for several types of core components of high-flux research reactors. In order to carry out design and safety analysis of these components, their mechanical and fracture properties are required by the designer. In this work, experiments have been conducted on tensile specimens machined from an aluminium alloy block to evaluate the material stress-strain curve. Experiments have also been conducted on disc-shaped compact tension specimens in order to determine the fracture toughness of aluminium alloy. Numerical simulations of both tensile and fracture specimens have been carried out using the crystal plasticity model. Initially, the slip system level parameters of the crystal plasticity material model have been calibrated using experimental stress-strain data for single as well as polycrystalline aluminium. For the prediction of crack initiation toughness, Rice and Tracey’s damage model has been used. The critical damage parameter has been evaluated for a fractured specimen with a crack length-to-width (a/W) ratio of 0.6. The attainment of the critical damage parameter in the analysis corresponds to the instance of experimentally observed ductile crack initiation in the specimen. Later, this model was applied to other fracture specimens with different a/W ratios with values ranging from 0.39 to 0.59. It was observed that the critical damage parameter corresponding to crack initiation in the material has a very small variation, even if the specimens have different crack lengths. It is well-known in the literature that Rice and Tracey’s critical damage parameter is a material constant. Hence, we have applied the same model to predict crack initiation for single crystal fracture specimens with two different orientations of the crack plane. It was observed that the <111> orientation is more susceptible to crack initiation and propagation compared with the <100> orientation, as the damage parameter is high in the ligament of the specimen ahead of the crack tip for the same level of applied loading. As the [111] crack plane is more closely packed compared with the [100] plane, the distance between atomic planes is greater for the former, and hence, it is more susceptible to ductile damage. The results of the experiments and the material damage parameter are helpful for the integrity analysis of the fuel clad of research reactors as well as components of high-flux research reactors. Full article

Equity and inclusion are requisites of high-quality Physical Education (PE). However, there is a substantial gap in understanding PE Teacher Education’s (PETE) effectiveness in preparing Preservice Teachers (PSTs) to implement equity-driven pedagogies. Moreover, focused on individual retrospective gameplay engagement rates (participation time), current research fails to provide a holistic perspective of the practical manifestations of equity and inclusion in PE. This study fills this void with novel insights offered by a mixed-methods case study examining the following: (i) the process-oriented teaching strategies employed by a PST trained to deliver inclusive pedagogies, alongside student voices on lived experiences; and (ii) the outcome-oriented gameplay patterns across two teaching units (Basketball and Volleyball). Participants included one PST and 26 students. Extensive observations and focus groups mapped the applied teaching strategies and student responses. Video-based social network analysis captured equity and inclusion in students’ gameplay patterns, using metrics such as degree prestige. Findings indicate the PETE impact in inducing PSTs’ inclusive manipulation of learning activities and the fostering of inclusive team membership and positive collaboration. SNA metrics evidenced equitable and inclusive gameplay patterns. Despite pedagogical efforts, content-specific factors may influence students’ gameplay inclusion. Hence, a reflection on the multifaceted and non-linear nature of promoting inclusive participation is prompted. Full article

Social innovation (SI) has been credited with fostering novel solutions to the socio-economic challenges many rural areas face. The quest for a substantiated understanding of its potential for regional development has spawned a rich literature on SI impact assessments. Yet, having been instrumental, these assessments harbour several ambiguities as they seek to unveil objective impacts in a results-oriented manner. First, SI processes take diverse directionalities, questioning the idea of them being ‘straightforward facts’ and giving leeway to a more constructivist understanding. Second, a results-oriented perspective tends to obscure social processes that initially contribute to the emergence of impacts. In response to such concerns, we suggest a valuation perspective that explores how SI impacts are constructed iteratively throughout the innovation process. To do so, we operationalise the notion of dissonance as a critical factor embedded in innovative activities in three instances: impulses, turning points, and lock-ins. This perspective allows us to study how value is experienced, assigned, and strategically attracted while shedding light on how SI processes and their impacts are co-constructed in valuation processes. The article uses empirical vignettes from selected case studies with SI initiatives in Northern Germany. Full article

Background: Humans perceive and interpret the world through the lens of self-reference processes, typically facilitating enhanced performance for the task at hand. However, this research has predominantly emphasized the automatic facet of self-reference processing, overlooking how it interacts with control processes affecting everyday situations. Methods: We investigated this relationship between automatic and control self-reference processing in neuropsychological patients performing self-face perception tasks and the Birmingham frontal task measuring executive functions. Results: Principal component analysis across tasks revealed two components: one loaded on familiarity/orientation judgments reflecting automatic self-reference processing, and the other linked to the cross task and executive function indicating control processing requirements. Voxel-based morphometry and track-wise lesion-mapping analyses showed that impairments in automatic self-reference were associated with reduced grey matter in the ventromedial prefrontal cortex and right inferior temporal gyrus, and white matter damage in the right inferior fronto-occipital fasciculus. Deficits in executive control were linked to reduced grey matter in the bilateral inferior parietal lobule and left anterior insula, and white matter disconnections in the left superior longitudinal fasciculus and arcuate fasciculus. Conclusions: The causal evidence suggests that automatic and control facets of self-reference processes are subserved by distinct yet integrated ventral prefrontal–temporal and dorsal frontal–parietal networks, respectively. Full article

Rural communities in ecologically sensitive areas are confronted with environmental challenges and land waste. The hollowing out of villages because of the steady loss of young people has brought these problems to the fore. Research on the remediation of rural settlements in ecologically sensitive regions is scarce. This paper focuses on Tong Yu County, a region located in the agricultural and pastoral intertwined zones of western Jilin, which is known for its ecological sensitivity. On the basis of the results of the geographical assessment of the area via hierarchical analysis (AHP method)and soil and water conservation capacity evaluation via the revised universal soil loss equation model(RUSLE) and the net primary production quantitative index model(NPP model), we propose a rural development program that divides the study area into three different zones with different development orientations, namely, potential enhancement, agglomeration development, and expansion restrictions. Moreover, we conceived a rural settlement remediation scheme using the kernel density estimation method and provided remediation strategies for rural settlements of various density levels. The rural settlement development program and the rural settlement remediation scheme led to the optimization of rural settlements. Notably, with increasing kernel density, the area of rural settlements tends to increase and then decrease. Our research helps save 5.059 km² of land resources in the study area and offers guidance for improving the rural settlement layout in Tong Yu County. Full article

Background: Lymphedema is a debilitating condition that significantly affects quality of life due to its chronic nature and visible symptoms. Lymphaticovenous anastomosis (LVA) has emerged as a promising surgical intervention, yet its effects on body image and spiritual health alongside physical symptoms have not been thoroughly examined. This study evaluates the efficacy of LVA in improving symptoms, quality of life (QOL), body image, and spiritual well-being in lymphedema patients. Methods: A prospective cohort study was conducted at Kaohsiung Chang Gung Memorial Hospital, Taiwan, involving 44 patients with lymphedema undergoing LVA surgery. Evaluations were made pre-surgery, one month post-surgery, and six months post-surgery using the 36-Item Short Form Health Survey (SF-36), Multidimensional Body–Self Relations Questionnaire-Appearance Scales (MBSRQ-AS), and a spiritual health scale. Statistical analysis was performed using one-way repeated measures ANOVA. Results: Significant improvements were observed in lymphedema symptoms and QOL measures at six months post-operation. SF-36 results showed enhanced scores in nearly all domains, particularly in physical functioning and role-physical. The appearance orientation scores from the MBSRQ-AS significantly increased, indicating improved perceptions in some dimensions of body image. Conclusions: LVA surgery significantly enhances physical and psychological outcomes in patients with lymphedema, with marked improvements in symptoms, QOL, and body image perceptions. The findings suggest that while LVA is effective in addressing the physical and psychological aspects of lymphedema, it does not impact spiritual dimensions. This underscores the need for holistic approaches in the management of lymphedema to address all facets of patient well-being. Full article

This study aims to relate the emerging field of community psychology with the philosophical thoughts of Wonhyo, a prominent figure in Korean Buddhism, from the aspect of their common orientation, to explore the development of both Buddhist philosophy and psychological research. The integration of modern psychology and Buddhist theory has only recently begun. In community psychology, there is a continuous need for the complementation of theory and case studies, and within Buddhism, there is a need to academically and popularly expand the advantages of Buddhist teachings. Furthermore, this research is believed to significantly contribute to the theory and practice of community problem-solving, which modern society demands. The characteristics of community psychology that differ from previous psychological research are twofold. First, it conducts a balanced examination of individuals and structures, moving away from the individual-centric focus of traditional psychology. Second, it emphasizes practice beyond theory, diverging from the theory-heavy focus of prior studies. Wonhyo’s philosophy is particularly well-suited to these characteristics. In the discussion, the theoretical contributions of Buddhism to community psychology are examined, based on Wonhyo’s philosophy, with a focus on the two main features mentioned above. This includes discussions on Buddhist introspection and the pursuit of enlightenment, grounded in a Mahāyāna perspective of the interdependent nature of the One Dharma world and the Bodhisattva path. The study further explores Wonhyo’s philosophy and practical examples pertinent to community psychology. Specifically, this examination focuses on the community’s psychological characteristics and practical examples demonstrated in Wonhyo’s concepts of ‘One Mind’, ‘Harmonizing Disputes (Hwajaeng)’, and ‘Non-hindrance’, categorizing them into individual and community aspects. Through this research, it is confirmed that the personal cultivation and community contributions of Buddhism are vividly present in Wonhyo’s theory and deeds. Particularly, Wonhyo’s philosophy and actions, embodying the benefits of humanistic and relational Buddhism, are expected to contribute significantly to the problem-solving of modern society and the academic advancement in community psychology. Full article

The industrial adoption of material extrusion of polymers (MEX/P) is hindered by the geometric quality of manufactured parts. Contact image sensors (CISs), commonly used in flatbed scanners, have been proposed as a suitable technology for layer-wise characterization of contour deviations, paving the way for the application of corrective measures. Nevertheless, despite the high resolution of CIS digital images, the accurate characterization of layer contours in MEX/P is affected by contrast patterns between the layer and the background. Conventional edge-recognition algorithms struggle to comprehensively characterize layer contours, thereby diminishing the reliability of deviation measurements. In this work, we introduce a novel approach to precisely locate contour points in the context of MEX/P based on evaluating the similarity between the grayscale pattern near a particular tentative contour point and a previously defined gradient reference pattern. Initially, contrast patterns corresponding to various contour orientations and layer-to-background distances are captured. Subsequently, contour points are identified and located in the images, with coordinate measuring machine (CMM) verification serving as a ground truth. This information is then utilized by an adaptive edge-detection algorithm (AEDA) designed to identify boundaries in manufactured layers. The proposed method has been evaluated on test targets produced through MEX/P. The results indicate that the average deviation of point position compared to that achievable with a CMM in a metrology laboratory ranges from 8.02 µm to 13.11 µm within the experimental limits. This is a substantial improvement in the reliability of contour reconstruction when compared to previous research, and it could be crucial for implementing routines for the automated detection and correction of geometric deviations in AM parts. Full article

The Bounty Channel is a large-scale submarine channel system located in the eastern continental margin of New Zealand. Extending along the axis of the Bounty Trough, the channel system comprises three main tributaries (C1–C3) at its head, which merge downstream into a trunk channel leading to a terminal submarine fan. In this study, we use high-quality two-dimensional multichannel seismic data to investigate the formation and evolution of tributary channels C1 and C2. Four types of seismic facies are identified in the tributary channels: fill-type, mounded divergent, wavy, and subparallel facies. These seismic facies are correspondingly interpreted as topographic depression or channel fills, levees, sediment waves, and hemipelagic deposits. The Late Miocene tributary channels were developed above a pre-existing NE–SW-oriented depression. The Pliocene to Quaternary tributary channels are characterized by preferential development of higher levees on their left hand, and the presence of sediment waves on the lower levees of their right-hand, signaling an effect of the Coriolis force. The formation and evolution of the tributaries are primarily linked to regional tectonics, including increased convergence rate between the Pacific and Australian plates along the Alpine Fault in the Late Miocene and enhanced uplift and erosion at the Southern Alps during the Pliocene. Full article

The research is aimed at creating a methodology for increasing the positioning accuracy of an industrial robot and minimizing the vibration of the robot gripper by applying machine learning based on the developed mathematical model for estimating the positioning error. Two components of positioning accuracy are considered: geometric and kinematic errors and elastic static deformations. The dynamic error in the partial system of motion of the robot manipulator links is analyzed. The equation of partial motions is obtained from Lagrange’s differential equation of motion of the II kind. The system of differential equations for the positioning error was solved analytically by Euler’s method. An example of modeling the position and orientation error of the gripper due to temperature deformations of the third link for the manipulator scheme is given. An example of the modeling of static deformations and errors of the manipulator with elastic pliability of the robot links is given. An example of dynamic error modeling in a partial system of motion of the robot links is given. The proposed method of modeling robot gripper positioning errors makes it possible to increase the positioning accuracy of the industrial robot and minimize the vibration of the gripper. Having a mathematical model of positioning errors, it is possible to compensate for the positioning error by changing the speed of movement of the gripper reference point before determining the direct kinematic task. Full article