All Outputs (48)

Structure, processing and performance of ultra-high molecular weight polyethylene (IUPAC Technical Report). Part 1: characterizing molecular weight (2020)
Journal Article
Bucknall, C., Altstädt, V., Auhl, D., Buckley, P., Dijkstra, D., Galeski, A., …Wu, J. J. (2020). Structure, processing and performance of ultra-high molecular weight polyethylene (IUPAC Technical Report). Part 1: characterizing molecular weight. Pure and Applied Chemistry, 92(9), 1469-1483. https://doi.org/10.1515/pac-2019-0405

The aim of this project was to study the efficacy of current methods of quality control and quality assurance for ultra-high molecular weight polyethylene (UHMWPE) products, and find improvements where possible. Intrinsic viscosity (IV) tests were pe... Read More about Structure, processing and performance of ultra-high molecular weight polyethylene (IUPAC Technical Report). Part 1: characterizing molecular weight.

Quantum and nonlinear effects in light transmitted through planar atomic arrays (2020)
Journal Article
Bettles, R. J., Lee, M. D., Gardiner, S. A., & Ruostekoski, J. (2020). Quantum and nonlinear effects in light transmitted through planar atomic arrays. Communications Physics, 3(1), Article 141. https://doi.org/10.1038/s42005-020-00404-3

Understanding strong cooperative optical responses in dense and cold atomic ensembles is vital for fundamental science and emerging quantum technologies. Methodologies for characterizing light-induced quantum effects in such systems, however, are sti... Read More about Quantum and nonlinear effects in light transmitted through planar atomic arrays.

Disentangling the relative roles of climate and land cover change in driving the long-term population trends of European migratory birds (2020)
Journal Article
Howard, C., Stephens, P., Pearce-Higgins, J., Gregory, R., Butchart, S., & Willis, S. (2020). Disentangling the relative roles of climate and land cover change in driving the long-term population trends of European migratory birds. Diversity and Distributions, 26(11), 1442-1455. https://doi.org/10.1111/ddi.13144

Aim: Global declines in the populations of migratory species have been attributed largely to climate change and anthropogenic habitat change. However, the relative contribution of these factors on species’ breeding and non‐breeding ranges is unclear.... Read More about Disentangling the relative roles of climate and land cover change in driving the long-term population trends of European migratory birds.

Cobalt-Doped ZnO Nanorods Coated with Nanoscale Metal-Organic Framework Shells for Water-Splitting Photoanodes (2020)
Journal Article
Galan Gonzalez, A., Sivan, A. K., Hernández Ferrer, J., Bowen, L., Di Mario, L., Martelli, F., …Atkinson, D. (2020). Cobalt-Doped ZnO Nanorods Coated with Nanoscale Metal-Organic Framework Shells for Water-Splitting Photoanodes. ACS Applied Nano Material, 3(8), 7781-7788. https://doi.org/10.1021/acsanm.0c01325

Developing highly efficient and stable photoelectrochemical (PEC) water splitting electrodes via inexpensive, liquid phase processing is one of the key challenges for the conversion of solar energy into hydrogen for sustainable energy production. ZnO... Read More about Cobalt-Doped ZnO Nanorods Coated with Nanoscale Metal-Organic Framework Shells for Water-Splitting Photoanodes.

Investigating users’ experience on social media ads: perceptions of young users (2020)
Journal Article
Al Qudah, D. A., Al-Shboul, B., Al-Zoubi, A., Al-Sayyed, R., & Cristea, A. I. (2020). Investigating users’ experience on social media ads: perceptions of young users. Heliyon, 6(7), Article e04378. https://doi.org/10.1016/j.heliyon.2020.e04378

Social media platforms changed from being socialization platforms to serve businesses through advertisements. This research aims at investigating active young users' experience with social media ads by studying the personalization and the usefulness... Read More about Investigating users’ experience on social media ads: perceptions of young users.

Ultrasensitive and low temperature gas sensor based on electrospun organic-inorganic nanofibers (2020)
Journal Article
Hittini, W., Greish, Y. E., Qamhieh, N. N., Alnaqbi, M. A., Zeze, D., & Mahmoud, S. T. (2020). Ultrasensitive and low temperature gas sensor based on electrospun organic-inorganic nanofibers. Organic Electronics, 81, Article 105659. https://doi.org/10.1016/j.orgel.2020.105659

Organic-inorganic hybrid material is one of the most promising materials for high performance gas sensors due to its improved properties like high sensitivity, selectivity, fast response time, flexibility and low power consumption. This work presents... Read More about Ultrasensitive and low temperature gas sensor based on electrospun organic-inorganic nanofibers.

Automated detection and classification of birdsong: An ensemble approach (2020)
Journal Article
Brooker, S. A., Stephens, P. A., Whittingham, M. J., & Willis, S. G. (2020). Automated detection and classification of birdsong: An ensemble approach. Ecological Indicators, 117, Article 106609. https://doi.org/10.1016/j.ecolind.2020.106609

The avian dawn chorus presents a challenging opportunity to test autonomous recording units (ARUs) and associated recogniser software in the types of complex acoustic environments frequently encountered in the natural world. To date, extracting infor... Read More about Automated detection and classification of birdsong: An ensemble approach.

Efficient Selection of Reservoir Model Outputs within an Emulation-Based Bayesian History Matching Uncertainty Analysis (2020)
Journal Article
Ferreira, C., Vernon, I., Caiado, C., Formentin, H., Avansi, G., Goldstein, M., & Schiozer, D. (2020). Efficient Selection of Reservoir Model Outputs within an Emulation-Based Bayesian History Matching Uncertainty Analysis. SPE Journal, 25(4), 2119-2142. https://doi.org/10.4043/29801-ms

When performing classic uncertainty reduction based on dynamic data, a large number of reservoir simulations need to be evaluated at high computational cost. As an alternative, we construct Bayesian emulators that mimic the dominant behaviour of the... Read More about Efficient Selection of Reservoir Model Outputs within an Emulation-Based Bayesian History Matching Uncertainty Analysis.

Exploring Navigation Styles in a FutureLearn MOOC (2020)
Book Chapter
Shi, L., Cristea, A. I., Toda, A. M., & Oliveira, W. (2020). Exploring Navigation Styles in a FutureLearn MOOC. In V. Kumar, & C. Troussas (Eds.), Intelligent Tutoring Systems (45-55). Springer Verlag. https://doi.org/10.1007/978-3-030-49663-0_7

This paper presents for the first time a detailed analysis of fine-grained navigation style identification in MOOCs backed by a large number of active learners. The result shows 1) whilst the sequential style is clearly in evidence, the global style... Read More about Exploring Navigation Styles in a FutureLearn MOOC.

Only the largest terrestrial Carnivores increase their dietary breadth with increasing prey richness (2020)
Journal Article
Ferretti, F., Lovari, S., Lucherini, M., Hayward, M., & Stephens, P. (2020). Only the largest terrestrial Carnivores increase their dietary breadth with increasing prey richness. Mammal Review, 50(3), 291-303. https://doi.org/10.1111/mam.12197

1. Animals should adapt their foraging habits, changing their dietary breadth in response to variation in the richness and availability of food resources. Understanding how species modify their dietary breadth according to variation in resource richn... Read More about Only the largest terrestrial Carnivores increase their dietary breadth with increasing prey richness.

Can We Use Gamification to Predict Students’ Performance? A Case Study Supported by an Online Judge (2020)
Presentation / Conference Contribution
Pereira, F. D., Toda, A., Oliveira, E. H., Cristea, A. I., Isotani, S., Laranjeira, D., Almeida, A., & Mendonça, J. (2021, June). Can We Use Gamification to Predict Students’ Performance? A Case Study Supported by an Online Judge. Presented at ITS 2020, Athens / Virtual

The impact of gamification has been typically evaluated via self-report assessments (questionnaires, surveys, etc.). In this work, we analise the use of gamification elements as parameters, to predict whether students are going to fail or not in a pr... Read More about Can We Use Gamification to Predict Students’ Performance? A Case Study Supported by an Online Judge.

Data-Driven Analysis of Engagement in Gamified Learning Environments: A Methodology for Real-Time Measurement of MOOCs (2020)
Presentation / Conference Contribution
Alharbi, K., Alrajhi, L., Cristea, A. I., Bittencourt, I. I., Isotani, S., & James, A. (2020, December). Data-Driven Analysis of Engagement in Gamified Learning Environments: A Methodology for Real-Time Measurement of MOOCs. Presented at 16th International Conference, ITS 2020

Welfare and economic development is directly dependent on the availability of highly skilled and educated individuals in society. In the UK, higher education is accessed by a large percentage of high school graduates (50% in 2017). Still, in Brazil,... Read More about Data-Driven Analysis of Engagement in Gamified Learning Environments: A Methodology for Real-Time Measurement of MOOCs.

A Multidimensional Deep Learner Model of Urgent Instructor Intervention Need in MOOC Forum Posts (2020)
Presentation / Conference Contribution
Alrajhi, L., Alharbi, K., & Cristea, A. I. (2020, December). A Multidimensional Deep Learner Model of Urgent Instructor Intervention Need in MOOC Forum Posts. Presented at ITS 2020: International Conference on Intelligent Tutoring Systems

In recent years, massive open online courses (MOOCs) have become one of the most exciting innovations in e-learning environments. Thousands of learners around the world enroll on these online platforms to satisfy their learning needs (mostly) free of... Read More about A Multidimensional Deep Learner Model of Urgent Instructor Intervention Need in MOOC Forum Posts.

Using learning analytics in the Amazonas: understanding students’ behaviour in introductory programming (2020)
Journal Article
Pereira, F. D., Oliveira, E. H., Oliveira, D., Cristea, A. I., Carvalho, L. S., Fonseca, S., …Isotani, S. (2020). Using learning analytics in the Amazonas: understanding students’ behaviour in introductory programming. British Journal of Educational Technology, 51(4), 955-972. https://doi.org/10.1111/bjet.12953

Tools for automatic grading programming assignments, also known as Online Judges, have been widely used to support computer science (CS) courses. Nevertheless, few studies have used these tools to acquire and analyse interaction data to better unders... Read More about Using learning analytics in the Amazonas: understanding students’ behaviour in introductory programming.

Splitting of two-component solitary waves from collisions with narrow potential barriers (2020)
Journal Article
Grimshaw, C. L., Gardiner, S. A., & Malomed, B. A. (2020). Splitting of two-component solitary waves from collisions with narrow potential barriers. Physical Review A, 101(4), Article 043623. https://doi.org/10.1103/physreva.101.043623

We consider the interaction of two-component bright-bright solitons with a narrow potential barrier (splitter) in the framework of a system of two Gross-Pitaevskii (nonlinear-Schrödinger) equations modeling a binary Bose-Einstein condensate, with sel... Read More about Splitting of two-component solitary waves from collisions with narrow potential barriers.

$C^*$-algebras of right LCM monoids and their equilibrium states (2020)
Journal Article
Brownlowe, N., Larsen, N. S., Ramagge, J., & Stammeier, N. (2020). $C^*$-algebras of right LCM monoids and their equilibrium states. Transactions of the American Mathematical Society, 373(7), 5235-5273. https://doi.org/10.1090/tran/8097

We study the internal structure of C-algebras of right LCM monoids by means of isolating the core semigroup C-algebra as the coecient algebra of a Fock-type module on which the full semigroup C-algebra admits a left action. If the semigroup has a gen... Read More about $C^*$-algebras of right LCM monoids and their equilibrium states.

Citizen scientists: school students conducting, contributing to and communicating ecological research – experiences of a school–university partnership (2020)
Journal Article
Hsing, P., Coghill, L., Ryder, J., Austin, M., Dooley, S., Ellison, A., …Stephens, P. (2020). Citizen scientists: school students conducting, contributing to and communicating ecological research – experiences of a school–university partnership. School science review, 101(376), 67-74

Started in north-east England in 2015, MammalWeb aims to improve our knowledge of British mammals through the use of motion-sensing camera traps. Fundamental to the project is the involvement of local communities and individuals who act as citizen sc... Read More about Citizen scientists: school students conducting, contributing to and communicating ecological research – experiences of a school–university partnership.

Burning savanna for avian species richness and functional diversity (2020)
Journal Article
Docherty, T., Hethcoat, M., MacTavish, L., MacTavish, D., Dell, S., Stephens, P., & Willis, S. (2020). Burning savanna for avian species richness and functional diversity. Ecological Applications, 30(4), Article e02091. https://doi.org/10.1002/eap.2091

Prescribed fire is used throughout fire‐prone landscapes to conserve biodiversity. Current best practice in managing savanna systems advocates methods based on the assumption that increased fire‐mediated landscape heterogeneity (pyrodiversity) will p... Read More about Burning savanna for avian species richness and functional diversity.

Best practice for collar deployment of tri-axial accelerometers on a terrestrial quadruped to provide accurate measurement of body acceleration (2020)
Journal Article
Dickinson, E., Stephens, P., Marks, N., Wilson, R., & Scantlebury, D. (2020). Best practice for collar deployment of tri-axial accelerometers on a terrestrial quadruped to provide accurate measurement of body acceleration. Animal Biotelemetry, 8, Article 9. https://doi.org/10.1186/s40317-020-00198-9

Background: Tri-axial accelerometers are frequently deployed on terrestrial quadrupedal mammals using collars, because they are easy to fit and are thought to have minimal impact on the subject. Collar-attached devices are not fixed to the body and c... Read More about Best practice for collar deployment of tri-axial accelerometers on a terrestrial quadruped to provide accurate measurement of body acceleration.

Splitting and recombination of bright-solitary-matter waves (2020)
Journal Article
Wales, O. J., Rakonjac, A., Billam, T. P., Helm, J. L., Gardiner, S. A., & Cornish, S. L. (2020). Splitting and recombination of bright-solitary-matter waves. Communications Physics, 3, Article 51. https://doi.org/10.1038/s42005-020-0320-8

Atomic Bose–Einstein condensates confined in quasi-1D waveguides can support bright-solitary-matter waves when interatomic interactions are sufficiently attractive to cancel dispersion. Such solitary-matter waves are excellent candidates for highly s... Read More about Splitting and recombination of bright-solitary-matter waves.