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Now showing items 3081-3090 of 3321
Fractional-order controllers for stick-slip vibration mitigation in oil well drill-strings
(
SAGE
, 2021 , Article)
Drillstring–borehole interaction can produce severely damaging vibrations. An example is stick–slip vibration, which negatively affects drilling performance, tool integrity and completion time, and costs. Attempts to ...
The COVID-19 pandemic: An opportunity to make mental health a higher public health priority
(
Cambridge University Press
, 2021 , Article Review)
Coronavirus disease 2019 (COVID-19) was first recognised in December 2019. The subsequent pandemic has caused 4.3 million deaths and affected the lives of billions. It has increased psychosocial risk factors for mental ...
Optimal piezoelectric shunt dampers for non-deterministic substructure vibration control: estimation and parametric investigation
(
Nature Research
, 2021 , Article)
Piezoelectric (PZT) shunt damping is an effective method to dissipate energy from a vibrating structure; however, most of the applications focus on targeting specific modes for structures vibrating at low-frequency range, ...
The COVID-19 pandemic and healthcare systems in Africa: A scoping review of preparedness, impact and response
(
BMJ Publishing Group
, 2021 , Article)
Background The COVID-19 pandemic has overwhelmed health systems in both developed and developing nations alike. Africa has one of the weakest health systems globally, but there is limited evidence on how the region is ...
Modified zeolite/polysulfone mixed matrix membrane for enhanced CO2/CH4 separation
(
MDPI AG
, 2021 , Article)
In recent years, mixed matrix membranes (MMMs) have received worldwide attention for their potential to offer superior gas permeation and separation performance involving CO2 and CH4. However, fabricating defect-free MMMs ...
Investigating the impact of electronic health record on healthcare professionals
(
Growing Science
, 2021 , Article)
Although there is a significant influence of implementing the electronic health records (EHR) system in Qatar, there are very limited studies reviewed and analyzed the influence of implementing the EHR system on healthcare ...
Rupture of an industrial gfrp composite mitered elbow pipe
(
MDPI AG
, 2021 , Article)
This paper examines the immature rupture of glass fiber reinforced plastic composite (GFRP) mitered elbow pipes. The GFRP composite mitered elbow pipe’s lifespan was twenty-five years; however, the pipes in question ...
Self-reported likely behaviour of rail passengers during an emergency evacuation-A case study of Kuala Lumpur, Malaysia
(
Elsevier
, 2021 , Article)
Prior knowledge on how passengers behave during a potential emergency evacuation could be advantageous in designing efficient crowd management and emergency procedures. This study examines the likely behaviours of Malaysian ...
Thermoeconomic and optimization analyses of direct oxy-combustion supercritical carbon dioxide power cycles with dry and wet cooling
(
Elsevier
, 2021 , Article)
Oxy-combustion supercritical CO2 power cycles have the advantages of high-energy efficiency and near-zero pollutant emissions. Thus, these cycles are considered as an efficient way to reduce CO2 emissions while maintaining ...
Energy and exergy analyses of novel supercritical CO2 Brayton cycles driven by direct oxy-fuel combustor
(
Elsevier
, 2021 , Article)
This study addresses major research gaps related to supercritical carbon dioxide (sCO2) power cycles including the shortcomings due to adding extra components, the high operating temperatures and the lack of studies on ...