All Outputs (109)

Optimising crystallisation during rapid prototyping of Fe3O4-PA6 polymer nanocomposite component. [Dataset] (2022)
Dataset
GUPTA, R., NJUGUNA, J. and PANCHOLI, K. 2022. Optimising crystallisation during rapid prototyping of Fe3O4-PA6 polymer nanocomposite component. [Dataset]. Journal of composites science [online], 6(3), article 83. Available from: https://www.mdpi.com/2504-477X/6/3/83/s1

This paper discusses the effect of the catalyst and the activator concentrations on the properties of polymerised PA6-PMC containing 1 wt% uncoated MNPs. The focus herein is to tune the degree of crystallinity of the prepared PA6-PMC for the optimum... Read More about Optimising crystallisation during rapid prototyping of Fe3O4-PA6 polymer nanocomposite component. [Dataset].

Material challenges and opportunities in 3D printing for hip implant applications. (2022)
Journal Article
OKOLIE, O., STACHUREK, I., KANDASUBRAMANIAN, B. and NJUGUNA, J. 2022. Material challenges and opportunities in 3D printing for hip implant applications. Recent progress in materials [online], 4(1): 3D printing of engineering materials, article 2201004. Available from: https://doi.org/10.21926/rpm.2201004

There is a current need for tissue and organ repairs, replacement and regeneration for the patients who suffer from diseased/damaged tissues or organs. This situation is continuously on the rise and the supply on this form of therapy does not meet th... Read More about Material challenges and opportunities in 3D printing for hip implant applications..

An assessment of renewable energy development in energy mix for Togo. (2022)
Journal Article
KANSONGUE, N., NJUGUNA, J. and VERTIGANS, S. 2022. An assessment of renewable energy development in energy mix for Togo. International journal of sustainable energy [online], 41(8), pages 1037-1056. Available from: https://doi.org/10.1080/14786451.2021.2023150

The Togolese government plans to achieve 100% electrification to all by 2030, to meet the Millennium goals. The Delphi method is used with the experts drawn from policymakers, academic institutions, financial institutions, non-governmental institutio... Read More about An assessment of renewable energy development in energy mix for Togo..

Design and analysis of non-threaded drill pipe connector. (2022)
Thesis
THAKUR, J.O. 2022. Design and analysis of non-threaded drill pipe connector. Robert Gordon University, MRes thesis. Hosted on OpenAIR [online]. Available from: https://doi.org/10.48526/rgu-wt-2271554

This thesis determines the feasibility and application opportunities of a Snap-Latch Ring design based on the Pin and Box non-threaded connectors design. Modern drill pipes are connected by rotary threaded shouldered connections that have been prone... Read More about Design and analysis of non-threaded drill pipe connector..

The fate of waste drilling fluids from oil and gas industry activities in the exploration and production operations. (2022)
Journal Article
NJUGUNA, J., SIDDIQUE, S., KWROFFIE, L.B., PIROMRAT, S., ADDAE-AFOAKWA, K., EKEH-ADEGBOTOLU, U., OLUYEMI, G., YATES, K., MISHRA, A.K. and MOLLER, L. 2022. The fate of waste drilling fluids from oil and gas industry activities in the exploration and production. Waste management [online], 139, pages 362-380. Available from: https://doi.org/10.1016/j.wasman.2021.12.025

Operational discharges from oil and gas exploration industry, accidental spillage, or improperly disposed drilling wastes has serious detrimental effects on human and the environment. The water- and oil-based fluids wastes are generated every year al... Read More about The fate of waste drilling fluids from oil and gas industry activities in the exploration and production operations..

Determination of cure mechanism inside die for a part manufacturing during large-scale pultrusion. (2021)
Journal Article
MUKHERJI, A., TARAPORE, N. and NJUGUNA, J. 2022. Determination of cure mechanism inside die for a part manufacturing during large-scale pultrusion. Journal of applied polymer science [online], 139(17), article 52035. Available from: https://doi.org/10.1002/app.52035

The cure kinetics of resin, heat capacity and thermal conductivity of reinforcing materials of uncured mass dictates the ultimate curing of reinforced thermosets manufactured component. In this study, degree of conversion from heat capacity by ‘Lumry... Read More about Determination of cure mechanism inside die for a part manufacturing during large-scale pultrusion..

Magnetic polyamide 6 nanocomposites for increasing damage tolerance through self-healing of composite structures. (2021)
Thesis
GUPTA, R. 2021. Magnetic polyamide 6 nanocomposites for increasing damage tolerance through self-healing of composite structures. Robert Gordon University, PhD thesis. Hosted on OpenAIR [online]. Available from: https://doi.org/10.48526/rgu-wt-1987943

Self-healing materials have the ability to repeatedly repair damages that occur before complete failure of materials. The development of stimuli-responsive self-healing materials has been in demand recently for composite structures, since their failu... Read More about Magnetic polyamide 6 nanocomposites for increasing damage tolerance through self-healing of composite structures..

An investigation of casing structural integrity in shale gas horizontal wells during hydraulic fracturing using FEA and machine learning algorithms. (2021)
Thesis
MOHAMMED, A.I. 2021. An investigation of casing structural integrity in shale gas horizontal wells during hydraulic fracturing using FEA and machine learning algorithms. Robert Gordon University, PhD thesis. Hosted on OpenAIR [online]. Available from: https://doi.org/10.48526/rgu-wt-1603216

Unconventional oil and gas operators are currently facing the challenge of casing lateral buckling and/or deformation during shale gas wells stimulation through hydraulic fracturing. Failure of the casing during this process can lead to huge financia... Read More about An investigation of casing structural integrity in shale gas horizontal wells during hydraulic fracturing using FEA and machine learning algorithms..

An application of FEA and machine learning for the prediction and optimisation of casing buckling and deformation responses in shale gas wells in an in-situ operation. (2021)
Journal Article
MOHAMMED, A.I., BARTLETT, M., OYENEYIN, B., KAYVANTASH, K. and NJUGUNA, J. 2021. An application of FEA and machine learning for the prediction and optimisation of casing buckling and deformation responses in shale gas wells in an in-situ operation. Journal of natural gas science and engineering [online], 95, article 104221. Available from: https://doi.org/10.1016/j.jngse.2021.104221

This paper proposes a novel way to study the casing structural integrity using two approaches of finite element analysis (FEA) and machine learning. The approach in this study is unique, as it captures the pertinent parameters influencing the casing... Read More about An application of FEA and machine learning for the prediction and optimisation of casing buckling and deformation responses in shale gas wells in an in-situ operation..

Correction to: Swelling performance of sodium polyacrylate and poly(acrylamide‑co‑acrylic acid) potassium salt. (2021)
Journal Article
MAHON, R., BALOGUN, Y., OLUYEMI, G., and NJUGUNA, J. 2021. Correction to: Swelling performance of sodium polyacrylate and poly(acrylamide-co-acrylic acid) potassium salt. SN applied sciences [online], 3(8), article 756. Available from: https://doi.org/10.1007/s42452-021-04654-w

The original version of this Article contained an error of judgement in the inclusion of the names of the polymers and their application. The names of the polymers and their application were included, however, due to potential issues relating to conf... Read More about Correction to: Swelling performance of sodium polyacrylate and poly(acrylamide‑co‑acrylic acid) potassium salt..

The impact of thermal ageing on sealing performance of HNBR packing elements in downhole installations in oilfield wellhead applications. (2021)
Journal Article
HASSANI, F., FAISAL, N.H., NISH, R., ROTHNIE, S. and NJUGUNA, J. 2022. The impact of thermal ageing on sealing performance of HNBR packing elements in downhole installations in oilfield wellhead applications. Journal of petroleum science and engineering [online], 208(part B), article 109200. Available from: https://doi.org/10.1016/j.petrol.2021.109200

Hydrogenated nitrile butyl rubber (HNBR) elastomers are highly resistant to chemicals and degradation, and they are good candidates to be adopted in aggressive environmental conditions of high temperature and pressure. As these service parameters are... Read More about The impact of thermal ageing on sealing performance of HNBR packing elements in downhole installations in oilfield wellhead applications..

Drilling oil-based mud waste as a resource for raw materials: a case study on clays reclamation and their application as fillers in polyamide 6 composites. (2021)
Journal Article
SIDDIQUE, S., LEUNG, P.S. and NJUGUNA, J. 2021. Drilling oil-based mud waste as a resource for raw materials: a case study on clays reclamation and their application as fillers in polyamide 6 composites. Upstream oil and gas technology [online], 7, article ID 100036. Available from: https://doi.org/10.1016/j.upstre.2021.100036

To convert the hazardous oil-based mud waste into a resource, this study has addressed reclaimed nanoclays and its application as a filler material for reinforcing polyamide 6 polymer matrix into a novel polymer composite material. This work focuses... Read More about Drilling oil-based mud waste as a resource for raw materials: a case study on clays reclamation and their application as fillers in polyamide 6 composites..

Shock propagation behaviour and determination of Gruneisen state of equation for pultruded polyester/glass fibre-reinforced composites.   (2020)
Journal Article
MUKHERJI, A. and NJUGUNA, J. 2021. Shock propagation behaviour and determination of Gruneisen state of equation for pultruded polyester/glass fibre-reinforced composites. Composite structures [online], 262, article ID 113444. Available from: https://doi.org/10.1016/j.compstruct.2020.113444

Polyester fibres reinforced with glass fibres hybridised polyester resin composite (PFR/GFHC) is a unconventional complex high-molecular weight crosslinked network polymer composite. This novel composite can be used in the manufacture of structural b... Read More about Shock propagation behaviour and determination of Gruneisen state of equation for pultruded polyester/glass fibre-reinforced composites.  .

3D printing for hip implant applications: a review. (2020)
Journal Article
OKOLIE, O., STACHUREK, I., KANDASUBRAMANIAN, B. and NJUGUNA, J. 2020. 3D printing for hip implant applications: a review. Polymers [online], 12(11), articles ID 2682. Available from: https://doi.org/10.3390/polym12112682

There is a rising demand for replacement, regeneration of tissues and organ repairs for patients who suffer from diseased/damaged bones or tissues such as hip pains. The hip replacement treatment relies on the implant, which may not always meet the r... Read More about 3D printing for hip implant applications: a review..

Damping properties of flax/carbon hybrid epoxy/fibre-reinforced composites for automotive semi-structural applications. (2020)
Journal Article
FAIRLIE, G. and NJUGUNA, J. 2020. Damping properties of flax/carbon hybrid epoxy/fibre-reinforced composites for automotive semi-structural applications. Fibers [online], 8(10), article ID 64. Available from: https://doi.org/10.3390/fib8100064

The ever-increasing demand for environmentally friendly biocomposites for use in various engineering applications requires a strong understanding of these materials properties, especially in automotive applications. This study focused on investigatin... Read More about Damping properties of flax/carbon hybrid epoxy/fibre-reinforced composites for automotive semi-structural applications..

Particle emission measurements in three scenarios of mechanical degradation of polypropylene-nanoclay nanocomposites. (2020)
Journal Article
BLAZQUEZ, M., MARCHANTE, V., GENDRE, L., STAROST, K., NJUGUNA, J., SCHUTZ, J.A., LACAVE, J.M., EGIZABAL, A., ELIZETXEA, C. and CAJARAVILLE, M.P. 2020. Particle emission measurements in three scenarios of mechanical degradation of polypropylene-nanoclay nanocomposites. Journal of aerosol science [online], 150, article ID 105629. Available from: https://doi.org/10.1016/j.jaerosci.2020.105629

Researchers and legislators have both claimed the necessity to standardize the exposure assessment of polymer nanocomposites throughout their life cycle. In the present study we have developed and compared three different and independent operational... Read More about Particle emission measurements in three scenarios of mechanical degradation of polypropylene-nanoclay nanocomposites..

Oil-based mud waste reclamation and utilisation in low-density polyethylene composites. (2020)
Journal Article
SIDDIQUE, S., YATES, K., MATTHEWS, K., CSETENYI, L.J. and NJUGUNA, J. 2020. Oil-based mud waste reclamation and utilisation in low-density polyethylene composites. Waste management and research [online], 38(12), pages 1331-1344. Available from: https://doi.org/10.1177/0734242X20941076

Oil-based mud (OBM) waste from the oil and gas exploration industry can be valorised to tailor-made reclaimed clay-reinforced low-density polyethylene (LDPE) nanocomposites. This study aims to fill the information gap in the literature and to provide... Read More about Oil-based mud waste reclamation and utilisation in low-density polyethylene composites..

Assessment of nanoparticle emission of polypropylene, polyester and epoxy nanocomposites during automated drilling process. (2020)
Thesis
STAROST, K.J. 2020. Assessment of nanoparticle emission of polypropylene, polyester and epoxy nanocomposites during automated drilling process. Robert Gordon University [online], PhD thesis. Available from: https://openair.rgu.ac.uk

Polymer nanocomposites are becoming established widely across the industry due to (among other reasons) their lightweight performance advantages, and ability to meticulously target material properties with great control and precision. Despite the ben... Read More about Assessment of nanoparticle emission of polypropylene, polyester and epoxy nanocomposites during automated drilling process..

A novel research approach for whole-life-cycle electrical power systems asset management using retroductive case study method. (2020)
Journal Article
BRUINERS, J., NJUGUNA, J. and AGARWAL, A. 2020. A novel research approach for whole-life-cycle electrical power systems asset management using retroductive case study method. Innovative energy and research [online], 9(2), article number 1000234. Available from: https://www.omicsonline.org/open-access/a-novel-research-approach-for-wholelifecycle-electrical-power-systems-asset-management-using-retroductive-case-study-met.pdf

There are a vast number of complex influences on power systems assets both individually and as a collection of systems of assets. The complexities when governing what and when to intervene with these assets is played out over varying time frames and... Read More about A novel research approach for whole-life-cycle electrical power systems asset management using retroductive case study method..

Insulating MgO–Al2O3–LDPE nanocomposites for offshore medium-voltage DC cables. (2020)
Journal Article
GUPTA, R., SMITH, L., NJUGUNA, J., DEIGHTON, A. and PANCHOLI, K. 2020. Insulating MgO–Al2O3–LDPE nanocomposites for offshore medium-voltage DC cables. ACS applied electronic materials [online], 2(7), pages 1880-1891. Available from: https://doi.org/10.1021/acsaelm.0c00052

A polymer–metal oxide nanocomposite is a key in developing a high-temperature insulation material for power electronics and high-voltage direct current (HVDC) and medium-voltage direct current (MVDC) subsea cables having the capability of transmittin... Read More about Insulating MgO–Al2O3–LDPE nanocomposites for offshore medium-voltage DC cables..