Search results for "material"
showing 10 items of 32550 documents
Exploring integration prospects of opal-based photonic crystals
2003
Different methods of functionalisation of thin opal films are discussed, including synthesis of opals on pre-patterned substrates, post-synthesis electron beam lithography, preparation of opals with heterogeneous photonic band gap structure and integrating opals with light sources. These approaches have been tested experimentally and key technological problems have been identified.
New Materialist Explorations into Language Education
2023
This open access book analyzes language education through a socio-material framework. The authors revisit their position as researchers by decentering themselves and humans in general from the main focus of research activities and giving way to the materialities that are agentive but often overlooked parts of our research contexts and processes. Through this critical posthumanist realism, they are able to engage in research that sees society as an ethical interrelationship between humans and the material world and explore the socio-materialities of language education from the perspectives of material agency, spatial and embodied materiality, and human and non-human assemblages. Each chapter…
Dziedzictwo (po)górnicze - dylematy i perspektywy
2017
This paper discusses the process of transformation of the (coal) mining heritage from the 1990s up to the present day. It draws attention to the development of new trends related to the conservation and documentation of that heritage. In the last decades, numerous open air museums, tradition parks, monument trails have been created, which, through various forms of activities, encourage people to take interest in the history and traditions associated with mining. Today, the mining heritage has a significant potential, especially in terms of popular forms of tourism (industrial, urban, thematic). Due to institutional and financial support, also on the part of local environments, and a well-de…
Recent progress in metal-organic frameworks (MOFs) for CO2 capture at different pressures
2022
Global climate change ensued by the rise in atmospheric CO2 levels is one of the greatest challenges our planet is facing today. This worldwide distress demands technologies that can contribute to our society toward “negative carbon emissions”. Carbon capture and storage (CCS) technologies are in in important role for capturing CO2 from existing emission sources, such as industrial and energy production point sources, before new more prominent modifications to the energy infrastructure can be implemented. Recently, alongside point source capture, direct air capture (DAC) processes have emerged as highly sought-after technologies that are able to capture CO2 from the ambient air. Alongside t…
Assessing the Open Trenches in Screening Railway Ground-Borne Vibrations by Means of Artificial Neural Network
2009
Reducing ground borne vibrations in urban areas is a very challenging task in railway transportation. Many mitigation measures can be considered and applied; among these open trenches are very effective. This paper deals with the study of the effect, in terms of reduction of vertical and horizontal displacements and velocities, of the open trenches. 2D FEM simulations have been performed and several open trench configurations have been analysed varying the main geometric features such as width and depth, distance from the rail, thickness of the soil layer over the rigid bedrock, type of the ground, ratio between the depth of the trench, and the thickness of the soil layer. For quantifying t…
Student participation in peer interaction
2021
This study explores how students deal with material resources in their peer interaction when working in pairs in an open-ended problem-solving task. The productive use of material resources can be expected to support successful peer work. However, research into social phenomena in peer interaction is needed in order to identify and describe productive and less productive forms of dealing with material resources as students participate in open-ended problem-solving tasks. Consequently, this explorative study responds to this research need. Based on multimodal data, including video recordings, transcribed talk and the written contributions from four pairs of Year 7 students aged 12-13 years, …
Visual cues improve students’ understanding of divergence and curl: Evidence from eye movements during reading and problem solving
2019
The coordination of multiple external representations is important for learning, but yet a difficult task for students, requiring instructional support. The subject in this study covers a typical relation in physics between abstract mathematical equations (definitions of divergence and curl) and a visual representation (vector field plot). To support the connection across both representations, two instructions with written explanations, equations, and visual representations (differing only in the presence of visual cues) were designed and their impact on students’ performance was tested. We captured students’ eye movements while they processed the written instruction and solved subsequent c…
Individual Creativity and Career Choices of Pre-teens in the Context of a Math-Art Learning Event
2021
A sample of 392 students (aged 12-13 years, M± SD: 12. 52% girls) completed a learning module integrating informal hands-on mathematics and arts activity (extending STEM to STEAM). Within a 140 minute workshop period participants worked with commercially available ‘4Dframe’ Math and STEAM learning toolkits to design and create original, personal and individual geometrical structures. Two science pedagogues acted as tutors supervising the process and intervened only when needed. A pre-/post-test design monitored individual creativity, relative autonomy, and career choice preference. Path analysis elaborated the role of creativity (measured with two subscales: act and flow), and it showed tha…
Rewilding Language Education: Emergent Assemblages and Entangled Actions
2021
Integrating concepts and techniques from ethnomethodology and sociomaterialism, this article investigates the observable material processes involving human action and place‐based contexts of language use enabled by locative media. The focal pedagogical intervention utilized mobile augmented reality (AR) activities, the development of which was inspired by research on learning ‘in the wild.’ Applying the principle of reverse engineering, we introduce a pedagogical approach termed ‘rewilding’ for its emphasis on designing supportive conditions for goal‐directed interaction outside of classrooms. Three instances of AR materials use are presented from an out‐of‐class activity associated with un…
Copper Induces a Core Plasmon in Intermetallic Au(144,145)–xCux(SR)60 Nanoclusters
2015
The electronic structure and optical absorption spectra of intermetallic thiol-stabilized gold-copper clusters, having 144-145 metal atoms and 60 thiols, were studied by ab initio computations. The widely known icosahedral-based cluster model from the work of Lopez-Acevedo et al. (2009) was used, and clusters doped with one to 30 copper atoms were considered. When doped inside the metal core, copper induces dramatic changes in the optical spectrum as compared to the previously studied all-gold Au144(SR)60. An intense broad absorption peak develops in the range 535-587 nm depending on the amount of doping and doping sites. This result agrees very well with recent experiments by the Dass grou…