| 1. |
|
|
| 2. |
- Guldris Leon, Lorena, 1983, et al.
(author)
-
Evaluation of Refractory Metal Concentrations in Nano-Particulate Pressed-Powder Pellets Using LA-ICP-MS
- 2022
-
In: Minerals. - : MDPI AG. - 2075-163X. ; 12:7
-
Journal article (peer-reviewed)abstract
- Whole-rock geochemical analysis is a standard method to measure the chemical composition of ores. Analysis of refractory ore metals such as Ta and W typically requires fused bead and acid digestion followed by inductively coupled plasma atomic emission spectrometry (ICP-AES) and inductively coupled mass spectrometry (ICP-MS). Since these techniques are time-consuming and expensive, there is a demand for methods that can quantitatively measure low elemental concentration of refractory ore metals using a less expensive and simple approach. This paper evaluates preparation and analytical procedures developed to obtain whole-rock element concentrations of ore samples and mineral concentrates. It shows that the production of nano-particulate pressed-powder pellets followed by LA-ICP-MS analysis of W and Ta ores can be used to determine, within the error margin, the concentrations of the refractory metals W, Ta, Nb, and Sn compared to a reference values obtained by solution analysis. The results have implications for developing a commercially viable method for analysis of refractory elements to benefit mineral processing given the simplicity and resource-efficiency of the combined pressed pellet production and laser ablation analytical methodology.
|
|
| 3. |
- Hallberg, Peter, 1974-
(author)
-
On Knowledge Creation and Learning at the Intersection of Product Development and Engineering Education
- 2021
-
Doctoral thesis (other academic/artistic)abstract
- Today’s demands on higher engineering education given the rapid transformation of society are, to say the least, multifaceted. Rapidly increased complexity of technology as well as adaptation to sustainability requirements are causing major transformations and mergers of whole domains of technology that strongly impact current and future engineering workforces within these domains, in particular, the need for new competencies. To adapt to industry demands for engineering competence that fits new constellations of technology domains, providers of advanced engineering training – i.e., engineering faculties – need to inventory their toolbox for ways to support knowledge creation processes. Product development theory is a central part of many types of academic engineering programs. However, as the product development process itself is a process of knowledge creation, it also has strong relations to theories of learning. This thesis explores the idea that some of the tools of engineering that are also taught at engineering faculties and therefore are familiar to their members can beneficially be applied to the development and management of engineering curricula. This thesis explores the domains of product development theory, engineering education and learning analytics in search of overlapping approaches to knowledge creation. The outcome of this search, which are also the result of this thesis, is a set of proposed tools, measures, and approaches for the development, management, content, and arrangement of engineering curriculum. The main contributions focus on the use of physical artifacts and their contribution to engineering educational frameworks, such as the Conceiving – Designing – Implementing – Operating (CDIO) initiative. For this purpose, the thesis picks up on a previously developed concept of low-cost demonstrators for the establishment of a formalized learning and enabling platform that promotes implementation and execution of the CDIO framework. Furthermore, by adopting a similar approach to product development and learning theory, additional tools are identified and developed for curriculum adaptation, enhancement, and management. In particular, by examining the curriculum from previously unexplored perspectives followed by establishment of novel measurements, this thesis demonstrates how curriculum developers and program managers can increase their insights into the outcomes of their decisions.
|
|
| 4. |
- Vaitukaitis, Povilas, et al.
(author)
-
Water transport and absorption in pharmaceutical tablets – a numerical study
- 2020
-
In: Meccanica. - : Springer Science and Business Media LLC. - 1572-9648 .- 0025-6455. ; 55:2, s. 421-433
-
Journal article (peer-reviewed)abstract
- The quality of a coated pharmaceutical tablet can be strongly affected by the interactions of water droplets with the porous substrate during processes such as coating process. Three different mechanisms co-exist in the coating process: water spreading, absorption and evaporation. Disentangling the fundamental understanding of these phenomena can therefore be crucial for achieving a higher quality of the products (e.g. a longer shelf-life of the tablets) and for controlling the efficiency of the process. This paper aims to investigate the spreading and absorption mechanisms after droplet impingement on a tablet using a Lattice-Boltzmann methodology. Our numerical results (droplet height and spreading, penetration depth and absorbed volume) are in a good agreement with experimental data and numerical simulations available in the literature. In particular, the spreading phase is characterised by the capillary spreading time scale, as confirmed by previous studies. In contrast to previous studies, we find that the absorption process begins at times shorter than the capillary spreading time but with a different power-law in the absorbed volume. We explain this behaviour through a modified Washburn law that takes into account three-dimensional effects. Our data can be used as a benchmark to test novel mathematical models.
|
|
| 5. |
- Abera, Asmamaw, et al.
(author)
-
Air Quality in Africa : Public Health Implications
- 2021
-
In: Annual review of public health. - : Annual Reviews. - 0163-7525 .- 1545-2093. ; 42, s. 193-210
-
Journal article (peer-reviewed)abstract
- This review highlights the importance of air quality in the African urban development process. We address connections between air pollution and (a) rapid urbanization, (b) social problems, (c) health impacts, (d) climate change, (e) policies, and ( f ) new innovations. We acknowledge that air pollution levels in Africa can be extremely high and a serious health threat. The toxic content of the pollution could relate to region-specific sources such as low standards for vehicles and fuels, cooking with solid fuels, and burning household waste. We implore the pursuit of interdisciplinary research to create new approaches with relevant stakeholders. Moreover, successful air pollution research must regard conflicts, tensions, and synergies inherent to development processes in African municipalities, regions, and countries. This includes global relationships regarding climate change, trade, urban planning, and transportation. Incorporating aspects of local political situations (e.g., democracy) can also enhance greater political accountability and awareness about air pollution. Expected final online publication date for the Annual Review of Public Health, Volume 42 is April 2021. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.
|
|
| 6. |
- Allan, Julie, et al.
(author)
-
Etiska perspektiv på specialpedagogers yrkesroll och värdepedagogiska praktik
- 2022
-
Book (other academic/artistic)abstract
- Yrkesetik handlar om att hantera motstridiga värden på ett professionellt sätt. Olika dilemman är ständigt närvarande i skolans vardag och kan handla om att minimera risken för att elever ska exkluderas eller om att säkerställa att elever får möjlighet att visa sina kunskaper på rätt sätt. I sin yrkesroll ställs specialpedagogen inför mångfacetterade arbetsuppgifter som omfattar att stödja barn och elever i svårigheter, vara en kvalificerad samtalspartner i pedagogiska frågor och samverka med andra yrkesgrupper för att utveckla skolans verksamhet. Arbetet innebär val mellan olika handlingsalternativ som kräver både kunskap och förmåga att urskilja och värdera etiska aspekter i komplexa sammanhang. I boken diskuteras både dilemman och möjligheter där etiska perspektiv spelar en viktig roll. Kapitlen tar upp frågor med praktiknära innehåll som lämpar sig för såväl individuell reflektion som kollegiala samtal med syftet att skapa ett gemensamt yrkesetiskt språk. Boken vänder sig till blivande och praktiserande specialpedagoger samt andra yrkeskategorier med arbetsuppgifter inom det specialpedagogiska området.
|
|
| 7. |
- Arnarsson, Ívar Örn, 1988, et al.
(author)
-
Modeling industrial engineering change processes using the design structure matrix for sequence analysis: a comparison of multiple projects
- 2020
-
In: Design Science. - : Cambridge University Press (CUP). - 2053-4701. ; 6
-
Journal article (peer-reviewed)abstract
- The problem at hand is that vast amount of data on industrial changes is captured and stored; yet the present challenge is to systematically retrieve and use them in a purposeful way. This paper presents an industrial case study where complex product development processes are modeled using the design structure matrix (DSM) to analyze engineering change requests sequences. Engineering change requests are documents used to initiate a change process to enhance a product. Due to the amount of changes made in different projects, engineers want to be able to analyze these change processes to identify patterns and propose the best practices. The previous work has not specifically explored modeling engineering change requests in a DSM to holistically analyze sequences. This case study analyzes engineering change request sequences from four recent industrial product development projects and compares patterns among them. In the end, this research can help to identify and guide process improvement work within projects.
|
|
| 8. |
- Arnarsson, Ívar Örn, 1988, et al.
(author)
-
Natural language processing methods for knowledge management - Applying document clustering for fast search and grouping of engineering documents
- 2021
-
In: Concurrent Engineering Research and Applications. - 1063-293X .- 1531-2003. ; 29:2, s. 142-152
-
Journal article (peer-reviewed)abstract
- Product development companies collect data in form of Engineering Change Requests for logged design issues, tests, and product iterations. These documents are rich in unstructured data (e.g. free text). Previous research affirms that product developers find that current IT systems lack capabilities to accurately retrieve relevant documents with unstructured data. In this research, we demonstrate a method using Natural Language Processing and document clustering algorithms to find structurally or contextually related documents from databases containing Engineering Change Request documents. The aim is to radically decrease the time needed to effectively search for related engineering documents, organize search results, and create labeled clusters from these documents by utilizing Natural Language Processing algorithms. A domain knowledge expert at the case company evaluated the results and confirmed that the algorithms we applied managed to find relevant document clusters given the queries tested.
|
|
| 9. |
- Atterström, Andrea, et al.
(author)
-
Experiences about Reading and Writing Development Narrated by Students with Severe Speech and Physical Impairment
- 2023
-
In: International journal of disability, development and education. - : Taylor & Francis Group. - 1034-912X .- 1465-346X. ; 70:6, s. 1101-1119
-
Journal article (peer-reviewed)abstract
- Earlier research shows an arrest in reading and writing development among 9-12-year-old students with severe speech and physical impairment, SSPI. This article explores what five students with SSPI who have reached beyond beginner's phase without arrest in their literacy development have experienced as significant for their reading and writing development. The research design was explorative and case based. It contained researcher-participant longitudinal dialogues focusing on the students' experiences of literacy learning. Computer assisted email interviews were used. A semi-structured interview manual guided each dialogue. With the use of augmentative and alternative communication (AAC) systems and assistive technology devices, the participants could read and write (with alphabetical print in Swedish) independently. The analysis revealed four themes of great importance for the students' development of alphabetical print literacy skills: assistive technology use in writing and reading, continuity in long-term pedagogical relationships, mutual persistence in communication, and visions of nearer goals and future work life. The results are discussed in relation to the theoretical frameworks of self-efficacy and the capability approach.
|
|
| 10. |
|
|
