All Outputs (134)

Development of sustainable, multifunctional, advanced and smart hybrid solid-state electrolyte for structural battery composites. (2025)
Presentation / Conference Contribution
SIDDIQUE, S., FERNANDEZ, C., ELYAN, E., DONELLI, M., GREGORY, D. and NJUGUNA, J. 2025. Development of sustainable, multifunctional, advanced and smart hybrid solid-state electrolyte for structural battery composites. In Chang, F.-K. and Guemes, A. (eds.) Proceedings of the 15th International workshop on structural health monitoring 2025 (IWSHM 2025), 9-11 September 2025, Stanford, CA, USA. Lancaster, PA, USA: DEStech Publications, Inc. [online], pages 237-244. Available from: https://iwshm2025.stanford.edu/iwshm-proceedings-2025

The incremental energy demand exacerbates the global warming issues. One of the main triggering factors for this raising global warming is the transportation sector which causes around 30% of the world's emission. However, EU is facing several obstac... Read More about Development of sustainable, multifunctional, advanced and smart hybrid solid-state electrolyte for structural battery composites..

Multi-scale infinite element analysis of GFRP pipe stiffness: effect of fibre volume fraction. (2025)
Presentation / Conference Contribution
SOLADEMI, O.A., ABOLLE-OKOYEAGU, J. and NJUGUNA, J. 2025. Multi-scale infinite element analysis of GFRP pipe stiffness: effect of fibre volume fraction. Presented at the 2025 UK Carbon capture and storage (UKCCS) knowledge exchange conference, 10-11 September 2025, Sheffield, UK [online]. Available from: https://ukccsrc.ac.uk/ukccsrc-knowledge-exchange-conference-2025-sheffield-10-11-september-2025/#postergallery

This study employs a multi-scale finite element analysis (FEA) to investigate the mechanical behaviour of a Glass Fibre-Reinforced Polymer (GFRP) pipe under diametral compression. A Representative Volume Element (RVE) was used to generate homogenised... Read More about Multi-scale infinite element analysis of GFRP pipe stiffness: effect of fibre volume fraction..

Impact of rake angle on nanometric cutting of single crystal silicon: a molecular dynamics study. (2025)
Journal Article
OLANIYAN, T., FAISAL, N., and NJUGUNA, J. 2025. Impact of rake angle on nanometric cutting of single crystal silicon: a molecular dynamics study. International journal of advanced manufacturing technology [online], 139(11-12), pages 6259-6271. Available from: https://doi.org/10.1007/s00170-025-16088-4

Variations in the diamond tool rake angle affect cutting forces, chip formation, subsurface damage, and stress distribution. Researchers have diverse opinions on the optimal rake angles for best performance, and there is a need for further understand... Read More about Impact of rake angle on nanometric cutting of single crystal silicon: a molecular dynamics study..

Nigerian well abandonment landscape: challenges and lessons from global trends. (2025)
Presentation / Conference Contribution
CHUKWUEMEKA, A.O., IBUKUN, M., ABDULKARIM, A., OLUYEMI, G. and NJUGUNA, J. 2025. Nigerian well abandonment landscape: challenges and lessons from global trends. In Proceedings of the 2025 SPE (Society of Petroleum Engineers) Nigeria annual international conference and exhibition, 4-6 August 2025, Lagos, Nigeria. Hosted on OnePetro [online], paper number SPE-228808-MS. Available from: https://doi.org/10.2118/228808-MS

Permanent plug and abandonment is the last activity in the lifecycle of every oil and gas well. With a rising number of mature assets globally, a wave of well abandonment and infrastructure removal projects faces the industry. As a maturing basin, Ni... Read More about Nigerian well abandonment landscape: challenges and lessons from global trends..

Bridging Togo’s energy gap: renewable energy potentials, policy challenges, and strategic pathways for sustainable development. (2025)
Journal Article
KANSONGUE, N., VERTIGANS, S. and NJUGUNA, J. [2025]. Bridging Togo’s energy gap: renewable energy potentials, policy challenges, and strategic pathways for sustainable development. Journal of energy and power technology [online], (accepted).

This work investigates the potential of renewable energy to significantly reduce Togo’s energy deficit, offering a critical analysis of the country’s current energy landscape. It evaluates the availability and viability of renewable energy sources—pa... Read More about Bridging Togo’s energy gap: renewable energy potentials, policy challenges, and strategic pathways for sustainable development..

Structural integrity and failure mechanisms of thermoplastic composite pipes for offshore applications: insights from compressive and flexural testing. (2025)
Journal Article
OKOLIE, O., FAISAL, N.H., JAMIESON, H., MUKHERJI, A. and NJUGUNA, J. 2025. Structural integrity and failure mechanisms of thermoplastic composite pipes for offshore applications: insights from compressive and flexural testing. Engineering failure analysis [online], 179, article number 109775. Available from: https://doi.org/10.1016/j.engfailanal.2025.109775

This research investigates the structural integrity and mechanical behaviour of a thermoplastic composite pipe (TCP) that is particularly used in the offshore energy industry. The TCP offers enhanced strength and high strength-to-weight ratio ideal f... Read More about Structural integrity and failure mechanisms of thermoplastic composite pipes for offshore applications: insights from compressive and flexural testing..

Sustained casing pressure prediction and management using machine learning and deep learning. (2025)
Presentation / Conference Contribution
IBUKUN, M., AMISH, M., NJUGUNA, J. and OLUYEMI, G. 2025. Sustained casing pressure prediction and management using machine learning and deep learning. Presented at the 2025 SPE (Society of Petrolem Engineers) Africa technology conference (ACT 2025); navigating the future: building technological excellence for sustainable energy in Africa, 27-29 May 2025, Dar es Salaam, Tanzania.

Sustained Casing Pressure (SCP) significantly threatens well integrity in oil and gas operations, increasing operational risks, regulatory scrutiny, and intervention costs. Conventional reactive SCP management techniques that depend on periodic press... Read More about Sustained casing pressure prediction and management using machine learning and deep learning..

Multi-criteria decision-making approach to material selection for abandonment of high-pressure high-temperature (HPHT) wells exposed to harsh reservoir fluids. (2025)
Journal Article
CHUKWUEMEKA, A.O., OLUYEMI, G., MOHAMMED, A.I., ATTAR, S. and NJUGUNA, J. 2025. Multi-criteria decision-making approach to material selection for abandonment of high-pressure high-temperature (HPHT) wells exposed to harsh reservoir fluids. Polymers [online], 17(10), article number 1329. Available from: https://doi.org/10.3390/polym17101329

Portland cement is the primary barrier material for well abandonment. However, the limitations of cement, especially under harsh downhole conditions, are necessitating research into alternative barrier materials. While several alternatives have been... Read More about Multi-criteria decision-making approach to material selection for abandonment of high-pressure high-temperature (HPHT) wells exposed to harsh reservoir fluids..

Thermo-physical behaviour of thermoplastic composite pipe for oil and gas applications. (2025)
Journal Article
OKOLIE, O., FAISAL, N.H., JAMIESON, H., MUKHERJI, A. and NJUGUNA, J. 2025. Thermo-physical behaviour of thermoplastic composite pipe for oil and gas applications. Polymers [online], 17(8), article number 1107. Available from: https://doi.org/10.3390/polym17081107

Thermoplastic composite pipes (TCP) consist of three distinct layers—liner, reinforcement, and coating—offering superior advantages over traditional industrial pipes, including flexibility, lightweight construction, and corrosion resistance. This stu... Read More about Thermo-physical behaviour of thermoplastic composite pipe for oil and gas applications..

Integrated non-destructive testing for assessing manufacturing defects in melt-fusion bonded thermoplastic composite pipes. (2025)
Journal Article
OKOLIE, O., FAISAL, N.H., JAMIESON, H., MUKHERJI, A. and NJUGUNA, J. 2025. Integrated non-destructive testing for assessing manufacturing defects in melt-fusion bonded thermoplastic composite pipes. NDT [online], 3(1), article number 6. Available from: https://doi.org/10.3390/ndt3010006

The thermoplastic composite pipe (TCP) manufacturing process introduces defects that impact their performance, such as voids, misalignment, and delamination. Consequently, there is an increasing demand for effective non-destructive testing (NDT) tech... Read More about Integrated non-destructive testing for assessing manufacturing defects in melt-fusion bonded thermoplastic composite pipes..

Blue hydrogen in the United Kingdom: a policy and environmental case study. (2025)
Journal Article
OBUROH, A., OKE, A., NJUGUNA, J. and YOUNAS, M. 2025. Blue hydrogen in the United Kingdom: a policy and environmental case study. Energy reviews [online], 4(2), article number 100131. Available from: https://doi.org/10.1016/j.enrev.2025.100131

Blue hydrogen is one of the energy carriers to be adopted by the United Kingdom to reduce emissions to net Zero by 2050 and its use is majorly influenced by policy and technological innovations. With more than 10 blue hydrogen facilities planning pro... Read More about Blue hydrogen in the United Kingdom: a policy and environmental case study..

Tensile properties of epoxy composites filled with graphene nanoplatelets and PUF microcapsules. (2024)
Journal Article
NASCIMENTO, A.P., RIBEIRO, C.G., ZOSCHKE, G.H., NJUGUNA, J. and PEZZIN, S.H. 2024. Tensile properties of epoxy composites filled with graphene nanoplatelets and PUF microcapsules. Macromolecular symposia [online], 413(6): selected papers from the 17th Brazilian polymer conference (17th CBPol), article number 2400102. Available from: https://doi.org/10.1002/masy.202400102

This work evaluates the effect of poly(urea-formaldehyde) (PUF) microcapsules filled with aminated polydimethylsiloxane (PDMS-a), a self-healing agent, on the tensile properties of epoxy composites reinforced with graphene nanoplatelets (GNP). The mi... Read More about Tensile properties of epoxy composites filled with graphene nanoplatelets and PUF microcapsules..

Identifying defect location and analysing the dynamic response in fiber-reinforced polymer (FRP) pipelines using acoustic emission and machine learning techniques. (2024)
Presentation / Conference Contribution
SOLADEMI, O.A., ABOLLE-OKOYEAGU, C.J., FATUKASI, O. and NJUGUNA, J. 2024. Identifying defect location and analysing the dynamic response in fiber-reinforced polymer (FRP) pipelines using acoustic emission and machine learning techniques. In Sedmak, S., Đorđević, B., Petrović, A., Radaković, Z. and Sedmak, A. (eds.) Book of abstracts of the 12th annual conference of Society for Structural Integrity and Life (DIVK12), 17-19 November 2024, Belgrade, Serbia. Belgrade: DIVK (Society for Structural Integrity and Life) [online], page 160. Available from: https://www.divk12.com/divk12/publications

The safety and integrity of engineering structures are of utmost importance, it is essential for ensuring their safe operation and reliability under various loading conditions. Failure modelling and structural integrity of pipelines play a significan... Read More about Identifying defect location and analysing the dynamic response in fiber-reinforced polymer (FRP) pipelines using acoustic emission and machine learning techniques..

Insights into machining techniques for additively manufactured Ti6Al4V alloy: a comprehensive review. (2024)
Journal Article
SAMBO, A.M., YOUNAS, M. and NJUGUNA, J. 2024. Insights into machining techniques for additively manufactured Ti6Al4V alloy: a comprehensive review. Applied sciences [online], 14(22), article number 10340. Available from: https://doi.org/10.3390/app142210340

Investigation into the post-processing machinability of Ti6Al4V alloy is increasingly crucial in the manufacturing industry, particularly in the machining of additively manufactured (AM) Ti6Al4V alloy to ensure effective machining parameters. This re... Read More about Insights into machining techniques for additively manufactured Ti6Al4V alloy: a comprehensive review..

A review of well life cycle integrity challenges in the oil and gas industry and its implications for sustained casing pressure (SCP). (2024)
Journal Article
IBUKUN, M., ELYAN, E., AMISH, M., NJUGUNA, J. and OLUYEMI, G.F. 2024. A review of well life cycle integrity challenges in the oil and gas industry and its implications for sustained casing pressure (SCP). Energies [online], 17(22), article number 5562. Available from: https://doi.org/10.3390/en17225562

Sustained Casing Pressure (SCP) is a condition in oil and gas wells where continuous pressure buildup in the well casing over a long period of time occurs. Several factors might be responsible for this, including the influx of formation fluids, the l... Read More about A review of well life cycle integrity challenges in the oil and gas industry and its implications for sustained casing pressure (SCP)..

Fabrication with magnetic-spin coating: influence of magnetic-inertia energy ratio on gold-Pickering ferrofluid droplet assembly morphology. (2024)
Journal Article
OKPOZO, P., NJUGUNA, J., ISLAM, S., UYANGA, K. and PANCHOLI, K. 2024. Fabrication with magnetic-spin coating: influence of magnetic-inertia energy ratio on gold-Pickering ferrofluid droplet assembly morphology. Journal of magnetism and magnetic materials [online], 611, article number 172577. Available from: https://doi.org/10.1016/j.jmmm.2024.172577

Magnetic self-assembly of nanoparticles is a well-known technique for creating thin-film array-patterned functional microstructures. However, an uncontrollable hierarchical assembly formation of magnetically stimulated particles has hindered the desi... Read More about Fabrication with magnetic-spin coating: influence of magnetic-inertia energy ratio on gold-Pickering ferrofluid droplet assembly morphology..

Underwater target detection analysis using spherical acoustic sensor arrays. (2024)
Presentation / Conference Contribution
SUNDAS, R., BAIG, N.A., NJUGUNA, J., RAHMAN, K.U. and FOUGH, N. 2024. Underwater target detection analysis using spherical acoustic sensor arrays. In Proceedings of the 2024 IEEE (Institute of Electrical and Electronics Engineers) International workshop on Metrology for the sea; learning to measure sea health parameters (IEEE MetroSea 2024), 14-16 October 2024, Portorose, Slovenia. Piscataway: IEEE [online], pages 240-245. Available from: https://doi.org/10.1109/MetroSea62823.2024.10765723

The need to identify and monitor the target by taking active measurements before it gets close enough to attack has grown due to advancements in marine technology. As underwater vehicular technology continues to progress, there is an increasing inter... Read More about Underwater target detection analysis using spherical acoustic sensor arrays..

The state of the art in hydrogen storage. (2024)
Journal Article
REYNOLDS, J., ALI, D., NJUGUNA, J. and AMADHE, F. 2024. The state of the art in hydrogen storage. Green energy and environmental technology [online], 3(1), pages 1-40. Available from: https://doi.org/10.5772/geet.20240074

The global renewable energy mix is set to change even further with the increasing demand for hydrogen. The production levels are dramatically increasing, and it is becoming prevalent that the storage of hydrogen gas is much more complex than natural... Read More about The state of the art in hydrogen storage..

Effects of cutting conditions on the cutting forces in machining additively manufactured Ti6Al4V alloy. (2024)
Presentation / Conference Contribution
SAMBO, A.M., YOUNAS, M. and NJUGUNA, J. 2024. Effects of cutting conditions on the cutting forces in machining additively manufactured Ti6Al4V alloy. MATEC web of conferences [online], 401: proceedings of the 21st International conference on manufacturing research (ICMR 2024), 28-30 August 2024, Glasgow, UK, article number 06003. Available from: https://doi.org/10.1051/matecconf/202440106003

Machining of additive manufacturing (AM) process results in excessive consumption of the cutting power due to the high strength and hardness of the material produced that led to high cutting forces and short tool life during machining process. This p... Read More about Effects of cutting conditions on the cutting forces in machining additively manufactured Ti6Al4V alloy..

Recent developments in mechanical ultraprecision machining for nano/micro device manufacturing. (2024)
Journal Article
OLANIYAN, T., FAISAL, N. and NJUGUNA, J. 2024. Recent developments in mechanical ultraprecision machining for nano/micro device manufacturing. Micromachines [online], 15(8), article number 1030. Available from: https://doi.org/10.3390/mi15081030

The production of many components used in MEMS or NEMS devices, especially those with com-plex shapes, requires machining as the best option among manufacturing techniques. Ultraprecision machining is normally employed to achieve the required shapes,... Read More about Recent developments in mechanical ultraprecision machining for nano/micro device manufacturing..