136 results on '"Paul Doherty"'
Search Results
2. Standard threshold laser versus subthreshold micropulse laser for adults with diabetic macular oedema: the DIAMONDS non-inferiority RCT
- Author
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Noemi Lois, Christina Campbell, Norman Waugh, Augusto Azuara-Blanco, Mandy Maredza, Hema Mistry, Danny McAuley, Nachiketa Acharya, Tariq M Aslam, Clare Bailey, Victor Chong, Louise Downey, Haralabos Eleftheriadis, Samia Fatum, Sheena George, Faruque Ghanchi, Markus Groppe, Robin Hamilton, Geeta Menon, Ahmed Saad, Sobha Sivaprasad, Marianne Shiew, David H Steel, James Stephen Talks, Paul Doherty, Clíona McDowell, and Mike Clarke
- Subjects
diabetic macular edema ,dme ,diabetic macular oedema ,dmo ,diabetes ,laser ,micropulse ,subthreshold laser ,photocoagulation ,randomised clinical trial ,rct ,vascular endothelial growth factor ,vegf ,anti-vegfs ,ranibizumab ,aflibercept ,bevacizumab ,steroids ,cost-effectiveness ,eq5d-5l ,eq5d ,visqol ,nei vfq25 ,qol ,quality of life ,Medical technology ,R855-855.5 - Abstract
Background: The National Institute for Health and Care Excellence recommends macular laser to treat diabetic macular oedema with a central retinal subfield thickness of 24 Early Treatment Diabetic Retinopathy Study letters (Snellen equivalent > 20/320) in one/both eyes. Interventions: Participants were randomised 1 : 1 to receive 577 nm subthreshold micropulse laser or standard threshold macular laser (e.g. argon laser, frequency-doubled neodymium-doped yttrium aluminium garnet 532 nm laser); laser treatments could be repeated as needed. Rescue therapy with intravitreal anti-vascular endothelial growth factor therapies or steroids was allowed if a loss of ≥ 10 Early Treatment Diabetic Retinopathy Study letters between visits occurred and/or central retinal subfield thickness increased to > 400 µm. Main outcome measures: The primary outcome was the mean change in best-corrected visual acuity in the study eye at 24 months (non-inferiority margin 5 Early Treatment Diabetic Retinopathy Study letters). Secondary outcomes included the mean change from baseline to 24 months in the following: binocular best-corrected visual acuity; central retinal subfield thickness; the mean deviation of the Humphrey 10–2 visual field in the study eye; the percentage of people meeting driving standards; and the EuroQol-5 Dimensions, five-level version, National Eye Institute Visual Function Questionnaire – 25 and Vision and Quality of Life Index scores. Other secondary outcomes were the cost per quality-adjusted life-years gained, adverse effects, number of laser treatments and additional rescue treatments. Results: The DIAMONDS trial recruited fully (n = 266); 87% of participants in the subthreshold micropulse laser group and 86% of participants in the standard threshold macular laser group had primary outcome data. Groups were balanced regarding baseline characteristics. Mean best-corrected visual acuity change in the study eye from baseline to month 24 was –2.43 letters (standard deviation 8.20 letters) in the subthreshold micropulse laser group and –0.45 letters (standard deviation 6.72 letters) in the standard threshold macular laser group. Subthreshold micropulse laser was deemed to be not only non-inferior but also equivalent to standard threshold macular laser as the 95% confidence interval (–3.9 to –0.04 letters) lay wholly within both the upper and lower margins of the permitted maximum difference (5 Early Treatment Diabetic Retinopathy Study letters). There was no statistically significant difference between groups in any of the secondary outcomes investigated with the exception of the number of laser treatments performed, which was slightly higher in the subthreshold micropulse laser group (mean difference 0.48, 95% confidence interval 0.18 to 0.79; p = 0.002). Base-case analysis indicated no significant difference in the cost per quality-adjusted life-years between groups. Future work: A trial in people with ≥ 400 µm diabetic macular oedema comparing anti-vascular endothelial growth factor therapy alone with anti-vascular endothelial growth factor therapy and macular laser applied at the time when central retinal subfield thickness has decreased to
- Published
- 2022
- Full Text
- View/download PDF
3. Geological and geotechnical constraints in the Irish Sea for offshore renewable energy
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Mark Coughlan, Mike Long, and Paul Doherty
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irish sea ,constraint mapping ,offshore renewable energy ,sediments ,geohazards ,Maps ,G3180-9980 - Abstract
A 1:1,000,000 map of the Irish Sea, within the Irish Economic Exclusion Zone, is presented highlighting the spatial distribution of potential geological and geotechnical constraints to offshore wind energy development. In this mapping exercise we incorporated existing multibeam echosounder bathymetric and backscatter data collected by the Integrated Mapping for the Sustainable Development of Ireland’s Marine Resource programme. ArcGIS was used to interrogate the bathymetric data and produce maps for seabed morphological characteristics. Backscatter data and QTC Multiview derived sediment classification was used in conjunction with data from the literature to link sediment distribution with sediment transport pathways and to assess the possible impact on infrastructure. The result is a spatial constraints map, which may be used by developers, consultants and marine spatial planning authorities alike to help site projects and plan de-risking site investigations.
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- 2020
- Full Text
- View/download PDF
4. Patterns of population displacement during mega-fires in California detected using Facebook Disaster Maps
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Shenyue Jia, Seung Hee Kim, Son V Nghiem, Paul Doherty, and Menas C Kafatos
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Facebook disaster maps ,crowdsourced data ,social media ,Mann-Kendall trend ,anomaly analysis ,wildfires ,Environmental technology. Sanitary engineering ,TD1-1066 ,Environmental sciences ,GE1-350 ,Science ,Physics ,QC1-999 - Abstract
The Facebook Disaster Maps (FBDM) work presented here is the first time this platform has been used to provide analysis-ready population change products derived from crowdsourced data targeting disaster relief practices. We evaluate the representativeness of FBDM data using the Mann-Kendall test and emerging hot and cold spots in an anomaly analysis to reveal the trend, magnitude, and agglommeration of population displacement during the Mendocino Complex and Woolsey fires in California, USA. Our results show that the distribution of FBDM pre-crisis users fits well with the total population from different sources. Due to usage habits, the elder population is underrepresented in FBDM data. During the two mega-fires in California, FBDM data effectively captured the temporal change of population arising from the placing and lifting of evacuation orders. Coupled with monotonic trends, the fall and rise of cold and hot spots of population revealed the areas with the greatest population drop and potential places to house the displaced residents. A comparison between the Mendocino Complex and Woolsey fires indicates that a densely populated region can be evacuated faster than a scarcely populated one, possibly due to better access to transportation. In sparsely populated fire-prone areas, resources should be prioritized to move people to shelters as the displaced residents do not have many alternative options, while their counterparts in densely populated areas can utilize their social connections to seek temporary stay at nearby locations during an evacuation. Integrated with an assessment on underrepresented communities, FBDM data and the derivatives can provide much needed information of near real-time population displacement for crisis response and disaster relief. As applications and data generation mature, FBDM will harness crowdsourced data and aid first responder decision-making.
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- 2020
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5. Steps Towards Alcohol Misuse Prevention Programme (STAMPP): a school- and community-based cluster randomised controlled trial
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Harry Sumnall, Ashley Agus, Jon Cole, Paul Doherty, David Foxcroft, Séamus Harvey, Michael McKay, Lynn Murphy, and Andrew Percy
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heavy episodic drinking ,alcohol-related harms ,education ,school ,cluster randomised controlled trial ,stampp ,Public aspects of medicine ,RA1-1270 - Abstract
Background: Alcohol use in young people remains a public health concern, with adverse impacts on outcomes such as health, well-being, education and relationships. Objectives: To assess the effectiveness and cost-effectiveness of a combined classroom curriculum and parental intervention on self-reported alcohol use [heavy episodic drinking (HED)] and alcohol-related harms (indicators such as getting into fights after drinking, poorer school performance and trouble with friends and family). Design: A two-arm, cluster randomised controlled trial with schools as the unit of randomisation. Setting: A total of 105 post-primary schools in Northern Ireland (NI) and Glasgow/Inverclyde Educational Authority areas. Participants: A total of 12,738 male and female secondary school students (intervention delivered when students were in school year 9 in NI or S2 in Scotland in the academic year 2012–13 and aged 12–13 years) were randomised. Randomisation and baseline (T0) surveys took place when children were in school year 8 or S1. Schools were randomised (1 : 1) by an independent statistician to the Steps Towards Alcohol Misuse Prevention Programme (STAMPP) or to education as normal (EAN). All schools were stratified by free school meal provision. Schools in NI were also stratified by school type (male/female/coeducational). Interventions: STAMPP combined a school-based alcohol harm reduction curriculum [an adapted version of the School Health and Alcohol Harm Reduction Project (SHAHRP)] and a brief parental intervention designed to support parents in setting family rules around drinking. The classroom component comprised two phases delivered over 2 years, and the parental component comprised a standardised presentation delivered by a trained facilitator at specially arranged parent evenings on school premises. This was followed up a few weeks later by an information leaflet mailed to all intervention pupils’ parents highlighting the main points of the evening. Main outcome measures: (1) Self-reported HED (defined as self-reported consumption of ≥ 6 units in a single episode in the previous 30 days for male students and ≥ 4.5 units for female students) assessed at 33 months from baseline (T3); and (2) the number of self-reported harms (harms caused by own drinking) assessed at T3. Data sources: Self-completed pupil questionnaires. Results: At final follow-up (T3), data were available for 5160 intervention and 5073 control pupils for the HED outcome, and for 5234 intervention and 5146 control pupils for the self-reported harms outcome. The intervention reduced self-reported HED compared with EAN (p
- Published
- 2017
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6. Modeling trends from North American breeding bird survey data: a spatially explicit approach.
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Florent Bled, John Sauer, Keith Pardieck, Paul Doherty, and J Andrew Royle
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Medicine ,Science - Abstract
Population trends, defined as interval-specific proportional changes in population size, are often used to help identify species of conservation interest. Efficient modeling of such trends depends on the consideration of the correlation of population changes with key spatial and environmental covariates. This can provide insights into causal mechanisms and allow spatially explicit summaries at scales that are of interest to management agencies. We expand the hierarchical modeling framework used in the North American Breeding Bird Survey (BBS) by developing a spatially explicit model of temporal trend using a conditional autoregressive (CAR) model. By adopting a formal spatial model for abundance, we produce spatially explicit abundance and trend estimates. Analyses based on large-scale geographic strata such as Bird Conservation Regions (BCR) can suffer from basic imbalances in spatial sampling. Our approach addresses this issue by providing an explicit weighting based on the fundamental sample allocation unit of the BBS. We applied the spatial model to three species from the BBS. Species have been chosen based upon their well-known population change patterns, which allows us to evaluate the quality of our model and the biological meaning of our estimates. We also compare our results with the ones obtained for BCRs using a nonspatial hierarchical model (Sauer and Link 2011). Globally, estimates for mean trends are consistent between the two approaches but spatial estimates provide much more precise trend estimates in regions on the edges of species ranges that were poorly estimated in non-spatial analyses. Incorporating a spatial component in the analysis not only allows us to obtain relevant and biologically meaningful estimates for population trends, but also enables us to provide a flexible framework in order to obtain trend estimates for any area.
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- 2013
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7. Unlocking the Metaverse
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Paul Doherty and Paul Doherty
- Published
- 2023
8. Smart Cities: Reimagining the Urban Experience
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Paul Doherty and Paul Doherty
- Published
- 2023
9. Diabetic Macular Edema and Diode Subthreshold Micropulse Laser
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Noemi Lois, Christina Campbell, Norman Waugh, Augusto Azuara-Blanco, Mandy Maredza, Hema Mistry, Danny McAuley, Nachiketa Acharya, Tariq M. Aslam, Clare Bailey, Victor Chong, Louise Downey, Haralabos Eleftheriadis, Samia Fatum, Sheena George, Faruque Ghanchi, Markus Groppe, Robin Hamilton, Geeta Menon, Ahmed Saad, Sobha Sivaprasad, Marianne Shiew, David H. Steel, James Stephen Talks, Paul Doherty, Cliona McDowell, and Mike Clarke
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Ophthalmology - Published
- 2023
10. Production of parchment legal deeds in England, 1690–1830
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Sean Paul Doherty and Stuart Henderson
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Cultural Studies ,History ,Sociology and Political Science - Abstract
Biomolecular analysis of historical parchment legal documents is providing new insight into their production and use. Successful interpretation of this data is dependent on understanding if the location and date written on the document accurately reflect where the animal from which the parchment was produced was raised and when it died. Our analysis reveals that the location the deed concerns, or that of the stationer through whom it was sold, typically bears no relation to the animal’s origin, but that the date the agreement was signed was probably only a few months after the animal’s death.
- Published
- 2022
11. And Then You're Dead: A Scientific Exploration of the World's Most Interesting Ways to Die
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Paul Doherty and Paul Doherty
- Published
- 2017
12. Measurement of a Cryogenically Cooled Ultra Wideband Feed Horn for the Effelsberg Telescope
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Alex Dunning, Ken Smart, Nick Carter, Michael Bourne, Paul Doherty, and Santiago Castillo
- Published
- 2022
13. DIAbetic Macular Oedema aNd Diode Subthreshold micropulse laser (DIAMONDS): A randomized double-masked non-inferiority clinical trial
- Author
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Noemi, Lois, Christina, Campbell, Norman, Waugh, Augusto, Azuara-Blanco, Mandy, Maredza, Hema, Mistry, Danny, McAuley, Nachiketa, Acharya, Tariq M, Aslam, Clare, Bailey, Victor, Chong, Louise, Downey, Haralabos, Eleftheriadis, Samia, Fatum, Sheena, George, Faruque, Ghanchi, Markus, Groppe, Robin, Hamilton, Geeta, Menon, Ahmed, Saad, Sobha, Sivaprasad, Marianne, Shiew, David H, Steel, James Stephen, Talks, Paul, Doherty, Cliona, McDowell, and Mike, Clarke
- Abstract
Determine clinical-effectiveness, safety, and cost-effectiveness of subthreshold micropulse laser (SML), compared with standard laser (SL), for diabetic macular edema (DME) with central retinal thickness (CRT)400μ.Pragmatic, multicenter, allocation-concealed, double-masked, randomized, non-inferiority trial.Adults with400μ center-involved DME and best-corrected visual acuity (BCVA)24 Early Treatment Diabetic Retinopathy Study (ETDRS) letters in one/both eyes.Randomisation 1:1 to 577nm SML or SL; retreatments were allowed. Rescue with intravitreal anti-vascular endothelial growth factor therapies or steroids was permitted if10 ETDRS-letter-loss and/or CRT increased400μ.Primary: Mean change in BCVA in the study eye at 24 months (non-inferiority margin 5 ETDRS-letters). Secondary: mean change from baseline to month-24 in binocular BCVA; CRT and mean deviation (MD) of Humphrey 10-2 visual field in the study eye; percentage meeting driving standards; EuroQoL (EQ-5D-5L), National Eye Institute-Visual Function Questionnaire (NEI-VFQ25), and Vision and Quality of Life Index (VisQoL) scores; cost per quality-adjusted life year (QALY) gained; adverse effects; number of laser and rescue treatments.DIAMONDS recruited fully (n=266); 87% SML and 86% SL had primary outcome data. Mean BCVA change from baseline to month-24 was -2.43 (Standard Deviation [SD] 8.20) and -0.45 (SD 6.72) in SML and SL, respectively. SML was deemed not only non-inferior but also equivalent to SL as the 95% confidence interval (CI) (-3.9 to -0.04) lay wholly within both upper and lower margins of the permitted maximum difference (5 ETDRS-letters). There was no statistically significant difference in binocular BCVA (0.32 ETDRS letters; 95% CI -0.99, 1.64; p = 0.63), CRT (-0.64 microns; 95% CI -14.25, 12.98; p = 0.93), MD (0.39 dB; 95% CI -0.23, 1.02; p = 0.21), meeting driving standards (% point difference 1.6, 95% CI -25.3, 28.5; p=0.91), adverse effects (Risk Ratio 0.28, 95% CI 0.06, 1.34; p=0.11), rescue treatments (% point difference -2.8, 95% CI -13.1, 7.5; p=0.59) or EQ-5D/VFQ-25/VisQoL scores. Number of laser treatments was higher in SML (0.48; 95% CI 0.18, 0.79; p = 0.002). Base-case analysis indicated no differences in costs or QALYs.SML was equivalent to SL, requiring slightly higher laser treatments.
- Published
- 2022
14. A Meta-data driven approach to Searching for Educational Resources in a Global Context.
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Vincent P. Wade and Paul Doherty
- Published
- 2000
15. Geological and geotechnical constraints in the Irish Sea for offshore renewable energy
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Michael Long, Mark Coughlan, and Paul Doherty
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lcsh:Maps ,010504 meteorology & atmospheric sciences ,geohazards ,sediments ,Geography, Planning and Development ,offshore renewable energy ,010502 geochemistry & geophysics ,Irish sea ,01 natural sciences ,language.human_language ,Offshore renewable energy ,Irish ,lcsh:G3180-9980 ,13. Climate action ,constraint mapping ,Earth and Planetary Sciences (miscellaneous) ,language ,Submarine pipeline ,Geotechnical engineering ,14. Life underwater ,Exclusion zone ,irish sea ,Geology ,0105 earth and related environmental sciences - Abstract
A 1:1,000,000 map of the Irish Sea, within the Irish Economic Exclusion Zone, is presented highlighting the spatial distribution of potential geological and geotechnical constraints to offshore wind energy development. In this mapping exercise we incorporated existing multibeam echosounder bathymetric and backscatter data collected by the Integrated Mapping for the Sustainable Development of Ireland’s Marine Resource programme. ArcGIS was used to interrogate the bathymetric data and produce maps for seabed morphological characteristics. Backscatter data and QTC Multiview derived sediment classification was used in conjunction with data from the literature to link sediment distribution with sediment transport pathways and to assess the possible impact on infrastructure. The result is a spatial constraints map, which may be used by developers, consultants and marine spatial planning authorities alike to help site projects and plan de-risking site investigations.
- Published
- 2020
16. Stratigraphic model of the Quaternary sediments of the Western Irish Sea Mud Belt from core, geotechnical and acoustic data
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Michael Long, Boris Dorschel, Tobias Mörz, Andrew J. Wheeler, Mark Coughlan, and Paul Doherty
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geography ,geography.geographical_feature_category ,010504 meteorology & atmospheric sciences ,Bedrock ,Ice stream ,Lithostratigraphy ,Environmental Science (miscellaneous) ,010502 geochemistry & geophysics ,Geotechnical Engineering and Engineering Geology ,Oceanography ,01 natural sciences ,Outwash plain ,Earth and Planetary Sciences (miscellaneous) ,Geotechnical engineering ,Ice sheet ,Quaternary ,Geology ,Holocene ,0105 earth and related environmental sciences ,Marine transgression - Abstract
A new geotechno-stratigraphic model for Quaternary deposits in the Western Irish Sea Mud Belt area is presented. This area, located in the North Irish Sea, has been heavily influenced by the advance and retreat of the British and Irish Ice Sheet during the last glaciation and subsequent Holocene marine transgression. This study uses a synthesis of lithostratigraphy, geotechnical data (from in situ cone penetration testing) and seismic profiles to generate a stratigraphic framework describing the geometry, distribution and characteristics of Quaternary deposits in an area of the Western Irish Sea Mud Belt at increased resolution. Within a regional context, this stratigraphy is compared with other established offshore stratigraphies in the Irish Sea and terrestrial successions. Four stratigraphic units are identified consisting of a basal subglacial (lodgement) till (Unit 4) emplaced by the Irish Sea Ice Stream. Unit 4 overlies irregular bedrock and is overlain in turn by glaciomarine to glaciolacustrine, ice-proximal outwash and glaciomarine ice-proximal sand and sandy muds (Units 3 and 2 respectively; previously undifferentiated). A thick succession (up to 27 m) of Holocene marine muds (Unit 1) caps the sequence up to the contemporary seabed. Results show that these deposits, and their geotechnical properties, have significant implications for the anthropogenic use of the area, such as the development of offshore renewable energy infrastructure. Revealed are relatively thick (up to 30 m) weak, under-consolidated sediments at the surface and highly heterogeneous, often over-consolidated, sediments that have limited groundtruthing at depth. Furthermore, localised shallow gas is imaged on seismic profiles. The influence on the geotechnical properties of the sediments by this gas revealed no significant effect on shear strength values from cone penetration testing data, although it may have implications for the long-term behaviour of the sediments.
- Published
- 2019
17. On the estimation of foundation damping of mono pile-supported offshore wind turbines
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Abdollah Malekjafarian, Paul Doherty, Soroosh Jalilvand, and David Igoe
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business.industry ,Materials Science (miscellaneous) ,Logarithmic decrement ,Foundation (engineering) ,Structural engineering ,Turbine ,Industrial and Manufacturing Engineering ,Displacement (vector) ,Finite element method ,Vibration ,Offshore wind power ,Business and International Management ,business ,Pile ,Geology - Abstract
This paper investigates the estimation of foundation damping in a monopile supported offshore wind turbine. The soil-structure interaction is modelled using the commercial geotechnical Finite Element (FE) software, Plaxis 3D. This allows for a more rigorous consideration of the soil response and its effect on the overall dynamic behaviour of the system. A free vibration test is simulated by applying and removing a constant horizontal static load at the top of the tower. The structure starts free vibration when the load is removed. The free decay displacement response is measured at the point of loading. The well-known logarithmic decrement method is used for the estimation of overall damping from the free decay response. The damping is estimated at different time steps along the signal to provide an instantaneous damping. It is shown that the damping varies with the amplitude of the decaying displacement response.
- Published
- 2019
18. Murder's Snare
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Paul Doherty and Paul Doherty
- Abstract
Friar-sleuth Brother Athelstan is caught in a politically charged race against time! He must uncover the truth behind numerous gruesome murders in this tense historical mystery set in medieval London.Normandy, 1358: The Free Company of the'Via Crucis - the Way of the Cross'sweeps into the peaceful village of Avranches, like the riders from the Apocalypse, leaving nothing but death and hellish destruction in their wake.London, 1382: Brother Athelstan is summoned to unpick the ugly truth behind a number of killings afflicting the great city. Some carried out like clean, efficient assassinations, all bearing the message'Justitia Fiat - let there be justice', others inflicting torture and humiliation upon the bodies. But the victims all have one thing in common - they were all once members of Via Crucis.With every new gruesome discovery, Brother Athelstan, with the help of Coroner Cranston, uncovers more clues which make up a most complicated riddle - but can he put together the last piece before the fate of the whole country is decided?A skilfully plotted and researched medieval mystery which will appeal to fans of C.J. SANSOM
- Published
- 2024
19. Unlocking the Metaverse : A Strategic Guide for the Future of the Built Environment
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Paul Doherty and Paul Doherty
- Subjects
- Architecture--Technological innovations, Construction industry--Technological innovations, Metaverse--Industrial applications, Artificial intelligence--Industrial applications
- Abstract
Unlocking the Metaverse Highly comprehensive resource providing insight into how the “Metaverse,” and digital worlds in general, can be leveraged for business success Unlocking the Metaverse focuses on the strategic implementation of processes and the execution of Metaverse strategies, technologies, and innovations and provides readers with real world tools and strategies to succeed with market demands. The text provides a clear and concise description of what the Metaverse is and what its value means to readers and their companies. A continuous interaction with readers inside the book's virtual world in the Metaverse provides both structured and unstructured interactions with the highly qualified author and his guests in periodic and ongoing public events, serving as a repository of continuous learning and a sandbox for continuous innovations to be explored, analyzed, and reported. Unlocking the Metaverse covers sample topics such as: Construction documents and drawings, covering building information modeling (BIM), digital twins, virtual worlds, the metaverse, and level of experience/engagement measures Specifications changing role, covering specification manuals, lifecycle, 3D geolocation specs, and 3D search Smart contracts and tokenomics, DLT/blockchain, smart contracts, NFTs/FTs (digital building/digital asset), fractionalized ownership and digital real estate, and CBDCs, stablecoins, and crypto Future outlooks, covering machine learning and artificial intelligence (AI) as a whole, and its probable applications in gaming and robotics Providing authoritative coverage of an important and fast-evolving industry, Unlocking the Metaverse is an essential resource for architects, engineers, and contractors, facility managers and operators, and property owners who want to stay on the cutting edge of new forms of technology and leverage them to increase business success.
- Published
- 2023
20. Murder Most Treasonable
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Paul Doherty and Paul Doherty
- Abstract
Spies, secrets and suspicious circumstances: Friar-sleuth Brother Athelstan races against time to solve impossible crimes and uncover a traitor in this gripping historical mystery set in medieval London.London. March, 1382. Deep in the shadows, a clandestine organization known as the Secret Chancery operates under the sinister leadership of John of Gaunt's Master of Secrets. When two clerks from this covert group meet their demise in suspicious circumstances, friar-sleuth Brother Athelstan is urgently summoned to unravel the truth behind their deaths.A puzzling question lies at the heart of the investigation: how did the killer manage to navigate a labyrinth of locked doors, leaving no trace behind? As Brother Athelstan delves deeper into the mystery, a terrifying threat also emerges: the possibility of treason. King Richard's spies in France are also dying, almost as if someone's discovered exactly who they are...Brother Athelstan must race against the clock to uncover the truth before he and his companions get tangled up in the hunt for the traitor, with fatal consequences for them all.
- Published
- 2023
21. Dark Queen Wary
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Paul Doherty and Paul Doherty
- Abstract
With an imposter prince claiming he is Henry Tudor, Margaret Beaufort must play the game of kings very carefully in this richly-imagined medieval mystery.“Uneasy lies the head which wears the crown”1472. Edward IV reigns triumphant over England and his rivals, the Lancastrians. But he is uneasy, for one true claimant remains: the young Henry Tudor, son of Margaret Beaufort, Countess of Richmond. Henry's continued existence worries Edward, so he hatches a plan to bring a cuckoo into the nest – an imposter prince is presented to Margaret Beaufort as her son.Margaret is no fool and knows she must play this game of kings carefully... When she is invited to George Neville's beautiful home ‘The Moor'to help investigate some mysterious and gruesome murders she knows dark forces are at play. Whispers of a shadowy figure called Achitophel hang over the house's occupants, like the impenetrable mist that descended on the battle of Barnet the previous year and secured the crown for Edward. And as the body count increases, Margaret suspects there is a link to that fateful battle and the murderer who seems relentless in his thirst for blood...Can Margaret protect her life as well as her true son's claim to the throne?
- Published
- 2023
22. Living apart in Belfast: residential segregation in a context of ethnic conflict
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Michael A. Poole and Paul Doherty
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Ethnic conflict ,Context (language use) ,Sociology ,Criminology - Published
- 2020
23. Living apart in Belfast: residential segregation in a context of ethnic conflict
- Author
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Paul Doherty and Michael Poole
- Published
- 2020
24. Case Study: Using Facebook Data to Monitor Adherence to Stay-at-home Orders in Colorado and Utah
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Daniel B. Larremore, Michael Bradshaw, Ryan M. Layer, Bailey K. Fosdick, and Paul Doherty
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Measure (data warehouse) ,medicine.medical_specialty ,Coronavirus disease 2019 (COVID-19) ,Computer science ,business.industry ,Public health ,Social distance ,Internet privacy ,Open source ,Order (business) ,medicine ,Key (cryptography) ,business ,Limited resources - Abstract
In the absence of effective treatments, social distancing has been the only public health measure available to combat the COVID-19 pandemic. In the US, implementing this response has been left to state, county, and city officials, and many localities have issued some form of a stay-at-home order. Without existing tools and with limited resources, localities struggled to understand how their orders changed behavior. In response, several technology companies opened access to their users’ location data. As part of the COVID-19 Data Mobility Network, we obtained access to Facebook User data and developed four key metrics and visualizations to monitor various aspects of adherence to stay at home orders. These metrics were carefully incorporated into static and interactive visualizations for dissemination to local officials.All code is open source and freely available at https://github.com/ryanlayer/COvid19
- Published
- 2020
- Full Text
- View/download PDF
25. An ultra-wide bandwidth (704 to 4 032 MHz) receiver for the Parkes radio telescope
- Author
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Andrew Jameson, Santy Castillo, K. Jeganathan, Michael Kramer, Linqing Wen, Richard N. Manchester, Bin Dong, Stacy Mader, Ryan Shannon, Paul Doherty, Vince McIntyre, Vanessa A. Moss, Ettore Carretti, Yoon S. Chung, Andrew Cameron, Malcolm B. Smith, Danny C. Price, Sean Severs, John Sarkissian, Matthew Whiting, Nathan Pope, Nick Carter, Balthasar T. Indermuehle, Lawrence Toomey, Matthew Bailes, Les Reilly, M. Bourne, M. Marquarding, Stephanie Smith, Charlotte Sobey, Ken W. Smart, Nina Wang, Timothy Robishaw, J. A. Green, M. Bowen, Anastasios Tzioumis, Paul Roberts, Xu-Yang Gao, Elaine M. Sadler, M. Leach, Ron Beresford, B. Preisig, Philip G. Edwards, Peter Roush, George Hobbs, Jin-Lin Han, J. Tuthill, Ken Reeves, Willem van Straten, Simon Johnston, Jane F. Kaczmarek, W. Cheng, D. George, Azeem Ahmed, Douglas B. Hayman, N. D. R. Bhat, Shi Dai, Daniel A. Craig, Stefan Oslowski, Tim Ruckley, Douglas C.-J. Bock, Henry Kanoniuk, James Dempsey, Lister Staveley-Smith, Joanne Dawson, A. Dunning, Tuohutinuer Ergesh, Chris Phillips, John Reynolds, R. Chekkala, M. J. Kesteven, and S.W. Amy
- Subjects
Physics ,Digital signal processor ,business.industry ,Instrumentation ,Pipeline (computing) ,instrumentation receivers ,Electrical engineering ,Linearity ,FOS: Physical sciences ,020206 networking & telecommunications ,Astronomy and Astrophysics ,02 engineering and technology ,radio astronomy ,01 natural sciences ,Antenna efficiency ,Radio telescope ,Space and Planetary Science ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Calibration ,business ,Astrophysics - Instrumentation and Methods for Astrophysics ,010303 astronomy & astrophysics ,Instrumentation and Methods for Astrophysics (astro-ph.IM) ,Noise (radio) - Abstract
We describe an ultra-wide-bandwidth, low-frequency receiver ("UWL") recently installed on the Parkes radio telescope. The receiver system provides continuous frequency coverage from 704 to 4032 MHz. For much of the band (~60%) the system temperature is approximately 22K and the receiver system remains in a linear regime even in the presence of strong mobile phone transmissions. We discuss the scientific and technical aspects of the new receiver including its astronomical objectives, as well as the feed, receiver, digitiser and signal-processor design. We describe the pipeline routines that form the archive-ready data products and how those data files can be accessed from the archives. The system performance is quantified including the system noise and linearity, beam shape, antenna efficiency, polarisation calibration and timing stability., submitted to PASA
- Published
- 2020
26. Geophysical and Geological Assessment of Offshore Sediment Banks in the South Western Irish Sea
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Paul Doherty, Shauna Creane, Jimmy Murphy, Julie Clarke, and Mark Coughlan
- Subjects
Oceanography ,Sediment ,Submarine pipeline ,Irish sea ,Geology - Abstract
To date, Ireland’s only operational offshore wind farm project is located on Arklow Bank; a sediment bank situated nearshore in shallow (up to 2mbsl) waters. Such bank structures are preferable for wind farm development due to their competent sediment composition, shallow waters and proximity to shore for cable routing. However, as proven at Arklow Bank, issues of scour and sediment mobility around fixed foundations and cabling can compromise infrastructure stability. These issues highlight the need for adequate ground model assessments of such banks to aid planning, design, construction and maintenance phases of wind farm development.The southern Irish Sea is characterised by a series of such NNE-SSW trending sediment banks, many of which are earmarked for further wind farm developments. These coast-parallel bedforms are located approximately 10km off the south-east coast of Ireland, in circa 20-40m water depth and rise to only a couple of metres below sea level. They exert a strong control on the tidal flow pathways along the coast and offer coastal protection [1]. The banks themselves are quasi-stable in their own environment, influencing local hydro- and morphodynamics in terms of sediment waves. For offshore sediment banks to develop two fundamental conditions must be present: (1) an adequate source of sediment and; (2) a hydrodynamic regime capable of moving sediment [2]. European continental shelf sediment bank origins generally fall into two broad categories [2]; a) those formed under present day hydrodynamic and sediment conditions, or b) relict features created during post LGM transgression during periods of rapid sea level rise and stronger tidal current velocities. Paleo-tidal models have been used to reconstruct post-glacial hydrodynamic conditions in support of the proposed view of a glaciomarine environment genesis of these large bedforms in the Irish Sea [3].This study will use previously collected high resolution multi-beam echo sounder (MBES) data from the Integrated Mapping for the Sustainable Development of Ireland’s Marine Resource (INFOMAR) project in conjunction with newly obtained MBES, sub-bottom profiler, grab sample and vibro-core data to characterise; a) the stratigraphy of this highly dynamic and geologically complex region and b) sediment mobility on and around the sediment banks including their stability in the current hydrodynamic regime. Furthermore, this study will use this data to attempt to elucidate the origin of these sediment banks and their evolution through geological time. Data processed and analysed from this study will be used as an input and as validation for a coupled hydrodynamic, spectral wave and sediment transport 2D numerical model developed using MIKE 21 software. ReferencesWilliams, J.J., MacDonald, N.J., O’Connor, B.A., Pan, S., 2000. Offshore sand bank dynamics. Journal of Marine Systems, 24, 153-173. Dyer, K.R., Huntley, D.A., 1999. The origin, classification and modelling of sandbanks and ridges. Continental Shelf Research, 19, 1285–1330. Uehara., K., Scourse, J.D., Horsburgh, K.J, Lambeck, K., Purcell, A.P., 2006. Tidal evolution of the northwest European shelf seas from the Last Glacial Maximum to the present. Journal of Geophysical Research, 111(9).
- Published
- 2020
27. The Hanging Tree
- Author
-
Paul Doherty and Paul Doherty
- Abstract
Brother Athelstan must solve a theft from the royal treasure chamber and the murders of six executioners in this gripping medieval mystery. London. January, 1382. The Crown's treasury has been robbed. Tens of thousands of silver and gold coin mysteriously lifted from the most secure chamber in the kingdom; the five Clerks of the Dark who guarded the king's treasure brutally garrotted. Sir John Cranston and Brother Athelstan are appointed to investigate - but Athelstan has problems of his own. Clement the Key Master, who helped fashion the complex locks to the royal treasure chamber, has been found strangled in the nave of Athelstan's parish, St Erconwald's church. At the same time, six of the city's hangmen have been savagely murdered, their bodies stripped. Pinned to each corpse is a scrawled note:'Vengeance! The Upright Men never forget!'The Guild of Hangmen who frequent the majestic tavern, The Hanging Tree, on the River Thames, have petitioned for Sir John and Brother Athelstan to find the culprit. But have the sleuthing pair taken on more than they can handle... and could the two investigations be connected?
- Published
- 2022
28. Dark Queen Watching
- Author
-
Paul Doherty and Paul Doherty
- Abstract
The arrival of a band of Spanish mercenaries brings new danger for Margaret Beaufort and the House of Lancaster in this richly-imagined medieval mystery. November, 1471. With Edward of York on the English throne and her son, Henry Tudor, in exile in Brittany, the newly-widowed Margaret Beaufort, Countess of Richmond, is alone, without protectors. All she can do is wait and watch, planning for a time when she's in a position to make her move. But new dangers are emerging. En route to England is a band of Spanish mercenaries known as the Garduna. With no allegiance to prince, prelate or people, they are a lethal fighting force, utterly ruthless and implacable killers. But who has hired them... and why? The discovery of the body of an unexpected visitor, found murdered in a locked room in her London townhouse, heralds the start of a series of increasingly menacing incidents which threaten Margaret and her household. Is there an enemy within? It's up to Margaret's wily clerk Christopher Urswicke to uncover the truth and ensure Margaret survives to fulfil her destiny.
- Published
- 2021
29. The Stone of Destiny
- Author
-
Paul Doherty and Paul Doherty
- Abstract
A series of grisly deaths are linked to the sacred Stone of Scone in this compelling medieval mystery featuring friar-sleuth Brother Athelstan.'This abbey is a strange place, Brother Athelstan. A hall of ghosts, a place of flitting shadows. The dead throng here. I can hear them whispering as they ride the air.'During the harsh winter of 1381 murder stalks the streets of London in all its grisly forms. The city's prostitutes are falling prey to a silent, deadly assassin known as The Flayer who carefully peels his victims'skins for his collection. At the same time, Westminster Abbey, which houses the sacred Stone of Scone, is plagued by a series of hideous poisonings. Could there be a connection between these brutally violent deaths and the stone, which the English crown cherishes as a symbol of its rule over Scotland? Then there are the two former Upright Men, leaders of the Great Revolt, who are found mysteriously hanged in the Piebald Tavern, close to Brother Athelstan's parish church of St Erconwald - and Athelstan is faced with his most baffling investigation to date. Can he navigate this deadly maze of murder and intrigue and pull the various threads together?
- Published
- 2021
30. Foundation damping for monopile supported offshore wind turbines: A review
- Author
-
David Igoe, Paul Doherty, Soroosh Jalilvand, and Abdollah Malekjafarian
- Subjects
Wind power generation ,Accurate estimation ,Mechanical Engineering ,0211 other engineering and technologies ,Foundation (engineering) ,020101 civil engineering ,Ocean Engineering ,02 engineering and technology ,Turbine ,0201 civil engineering ,Offshore wind power ,Mechanics of Materials ,Environmental science ,General Materials Science ,Engineering design process ,021101 geological & geomatics engineering ,Marine engineering - Abstract
Today, an important challenge for offshore wind energy is to design efficient and reliable offshore wind turbines (OWTs). The overall damping of OWTs plays an important role in the design process as it limits the amplitude of the OWT dynamic response at frequencies near resonance. Therefore, an accurate estimation of OWTs damping is necessary for the efficient design of these systems. The foundation damping is one of the main sources overall turbine damping and is the least well understood. This paper presents a critical review of recently published studies on foundation damping for OWTs on monopiles and explains how soil damping contributes to the total damping of OWTs. It also reviews the main methods that have been used for the estimation of foundation damping in numerical and experimental studies. In addition, the importance of damping to the OWTs fatigue life is discussed. Finally, a discussion is provided on the challenges to be overcome and recommendations for the accurate estimation of foundation damping.
- Published
- 2021
31. British Petroleum, Ltd
- Author
-
Luann J. Lynch, Paul Doherty, and Susan Chaplinsky
- Subjects
Finance ,business.industry ,media_common.quotation_subject ,Corporation ,Medical Terminology ,Negotiation ,chemistry.chemical_compound ,chemistry ,Production (economics) ,Petroleum ,Cash flow ,Business ,Medical Assisting and Transcription ,media_common - Abstract
This case is one of a pair of cases used in a merger negotiation. It is designed to be used with “Amoco Corporation” (UVA-F-1262). One-half of the class prepares only the Amoco case, and one-half uses this case. BP and Amoco are considering a merger, and are in the process of negotiating a merger agreement. Macroeconomic assumptions, particularly forecasting future oil prices in an uncertain environment, and assumptions about Amoco's ability to reduce exploration and production costs make Amoco's future cash flows difficult to predict.
- Published
- 2017
32. Embedding webcasts in virtual worlds to enhance user experiences.
- Author
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Robert J. Rothfarb, Paul Doherty, Robyn Higdon, and Aimee Weber
- Published
- 2006
- Full Text
- View/download PDF
33. Ultra Wideband (UWB) Receiver for Radio Astronomy
- Author
-
M. Bowen, Ken W. Smart, Les Reilly, Stephanie Smith, A. Dunning, Peter Roush, Douglas B. Hayman, S. Mackay, J. Tuthill, M. Bourne, K. Jeganathan, Robert D. Shaw, Paul Roberts, D. George, Nick Carter, Paul Doherty, Yoon S. Chung, Santiago Castillo, and Sean Severs
- Subjects
business.industry ,Computer science ,Astrophysics::High Energy Astrophysical Phenomena ,Bandwidth (signal processing) ,Astrophysics::Instrumentation and Methods for Astrophysics ,Electrical engineering ,Ultra-wideband ,Field of view ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Electromagnetic interference ,Radio telescope ,Systems design ,business ,Digital signal processing ,Radio astronomy - Abstract
Advancements in receiver technology have been crucial for probing radio-frequency signals from distant sources. The survey speed of a radio telescope represents a critical constraint on astronomical observations and can be expressed in broad terms as the product of bandwidth, field of view and squared sensitivity [1]. Recent advances in digital signal processing allow receivers to provide greater bandwidth and field of view, improving survey speed for any given sensitivity. This paper discusses the fundamental radio telescope design principles, recent design challenges and progress made towards realizing a single feed L-S band receiver system covering from 704 MHz to 4032 MHz. The system design with emphasis on warm (non-cryogenic) electronics, impact of external Radio Frequency Interference (RFI) on the receiver and the commissioning results of the system on the 64m Parkes Radio Telescope in Australia are presented in this paper.
- Published
- 2019
34. New Receiver Technology for Radio Astronomy : A Technology Update from CSIRO and FAST
- Author
-
Alex Dunning, Yuqing Chen, Wan Cheng, Yoon S. Chung, Paul Doherty, Daniel George, Grant Hampson, Douglas B. Hayman, Kanapathippillai Jeganathan, Henry Kanoniuk, Simon Mackay, Mia Baquiran, Les Reilly, Paul Roberts, Peter Roush, Sean Severs, Robert D. Shaw, Ken Smart, Stephanie L. Smith, John Tuthill, Tasso Tzioumis, Veronica-Claire J. Venables, Ron Beresford, Rendong Nan, Chengjin Jin, Yan Zhu, Yang Cao, Xiangwei Shi, Jinyou Song, Jinglong Yu, Jin Fan, Youling Yue, Lei Qian, Michael Bourne, Bin Dong, Mark Bowen, Mike Brothers, John Bunton, Nick Carter, and Santiago Castillo
- Subjects
Signal processing ,Tandem ,010308 nuclear & particles physics ,business.industry ,Computer science ,Bandwidth (signal processing) ,Electrical engineering ,020206 networking & telecommunications ,Field of view ,02 engineering and technology ,01 natural sciences ,Ultra wideband antennas ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Field-programmable gate array ,business ,Digital signal processing ,Radio astronomy - Abstract
Radio astronomy receiver development is focusing on increasing the field of view and bandwidth in tandem with the exponential increase in data volumes permitted by signal processing. We present recent receiver and signal processing developments from CSIRO and FAST.
- Published
- 2019
35. Recent Centimetre Band Receiver Development at CSIRO Australia
- Author
-
Alex Dunning, Michael Bourne, Mark Bowen, Santiago Castillo, Nick Carter, Yoon S. Chung, Paul Doherty, Daniel George, Douglas B. Hayman, Kanapathippillai Jeganathan, Henry Kanoniuk, Simon Mackay, Les Reilly, Paul Roberts, Peter Roush, Sean Severs, Ken Smart, Robert D. Shaw, Stephanie Smith, John Tuthill, Tasso Tzioumis, and Veronica-Claire J. Venables
- Subjects
Telescope ,Phased array feed ,Computer science ,business.industry ,law ,Bandwidth (signal processing) ,Electrical engineering ,business ,law.invention ,Radio astronomy - Abstract
We present three recent receiver designs and the challenges in their development: a phased array feed (PAF), a multibeam system for FAST and an “ultra-wideband” feed for the Parkes telescope. A significant driver in the development of these receivers is the radio astronomy focus on surveys. In general terms
- Published
- 2019
36. Recanting of Previous Reports of Alcohol Consumption within a Large-Scale Clustered Randomised Control Trial
- Author
-
Séamus A. Harvey, Jon C. Cole, Michael T. McKay, Ashley Agus, Andrew Percy, Lynn Murphy, David R. Foxcroft, Paul Doherty, and Harry Sumnall
- Subjects
Male ,medicine.medical_specialty ,Adolescent ,Alcohol Drinking ,Article ,03 medical and health sciences ,Measurement error ,SDG 3 - Good Health and Well-being ,RA0421 ,medicine ,Or education ,Cluster Analysis ,Humans ,0501 psychology and cognitive sciences ,Trial registration ,Child ,Students ,Trial Arms ,030505 public health ,research ,business.industry ,Public health ,05 social sciences ,Public Health, Environmental and Occupational Health ,Recanting ,RCT, prevention trial ,United Kingdom ,Health psychology ,Sensitivity test ,Scale (social sciences) ,Female ,Self Report ,0305 other medical science ,business ,Alcohol ,Alcohol consumption ,Self-report ,050104 developmental & child psychology ,Demography - Abstract
The aim of this study was to examine the extent of recanting (inconsistencies in reporting of lifetime alcohol use) and its impact on the assessment of primary outcomes within a large-scale alcohol prevention trial. One hundred and five post-primary schools in were randomised to receive either the intervention or education as normal. Participants (N = 12,738) were secondary school students in year 8/S1 (mean age 12.5) at baseline. Self-report questionnaires were administered at baseline (T0) and at T1 (+ 12 months post-baseline), T2 (+ 24 months) and T3 (+ 33 months). The primary outcomes were (i) heavy episodic drinking (consumption of ≥ 6 units in a single episode in the previous 30 days for males and ≥ 4.5 units for females) assessed at T3 and (ii) the number of alcohol-related harms experienced in the last 6 months assessed at T3. Recanting was defined as a negative report of lifetime alcohol consumption that contradicted a prior positive report. Between T1 and T3, 9.9% of students recanted earlier alcohol consumption. Recanting ranged from 4.5 to 5.3% across individual data sweeps. While recanting was significantly associated (negatively) with both primary outcomes, the difference in the rate of recanting across trial arms was small, and adjusting for recanting within the primary outcome models did not impact on the primary outcome effects. Males were observed to recant at a greater rate than females, with a borderline small-sized effect (V = .09). While differential rates of recanting have the potential to undermine the analysis of prevention trial outcomes, recanting is easy to identify and control for within trial primary outcome analyses. Adjusting for recanting should be considered as an additional sensitivity test within prevention trials.Trial Registration: ISRCTN47028486 ( http://www.isrctn.com/ISRCTN47028486 ). The date of trial registration was 23/09/2011, and school recruitment began 01/11/2011.
- Published
- 2019
37. Dark Queen Waiting
- Author
-
Paul Doherty and Paul Doherty
- Abstract
Christopher Urswicke must unmask the traitor lurking amongst Margaret Beaufort's supposedly loyal followers in this gripping medieval mystery. October, 1471. Edward IV sits on the English throne; the House of York reigns supreme. With her young son, Henry Tudor, in exile in France, Margaret Beaufort, Countess of Richmond, shelters deep in the shadows, secretly plotting for the day when Henry can be crowned the rightful king. But as her supporters are picked off one by one, it becomes clear that a traitor lurks within Margaret's household. When one of her most loyal henchmen, Jacob Cromart, is murdered in St Michael's Church, where he had claimed sanctuary, Margaret orders her sharp-witted clerk, Christopher Urswicke, to find out who has betrayed her. How could a man be killed inside a church where the doors are all locked, with no sign of an intruder or weapon? If he is to protect Margaret's remaining supporters from suffering a similar fate, Urswicke must solve a baffling mystery where nothing is as it first appears.
- Published
- 2019
38. In situ and laboratory tests on a novel offshore mixed-in-place pile for oil and gas platforms
- Author
-
Paul Scheller, Giovanni Spagnoli, and Paul Doherty
- Subjects
Engineering ,Serviceability (structure) ,business.industry ,05 social sciences ,Fossil fuel ,0211 other engineering and technologies ,Drilling ,02 engineering and technology ,Geotechnical Engineering and Engineering Geology ,Finite element method ,chemistry.chemical_compound ,Fuel Technology ,chemistry ,0502 economics and business ,Carbonate ,Submarine pipeline ,Geotechnical engineering ,business ,Pile ,Calcareous ,050203 business & management ,021101 geological & geomatics engineering - Abstract
For the majority of offshore jackets, driven piles are the preferred foundation solution; however difficult soil conditions may preclude conventional pile driving. In such circumstances, methods of grouting a pile into an oversized hole or drilling and underreaming for a cast-in-place pile have received considerable attention. Drilled-and-grouted (D&G) piles are normally used in challenging geologies, such as very dense sands, very stiff clays and in calcareous deposits. However, D&G piles are normally time-consuming to construct. To address this challenge, the MIDOS pile system, which minimizes the number of offshore operations, was created and subjected to a suite of field tests. Cyclic tests were conducted on a pile installed in a silica sand deposit, where over 1000 loading cycles in between 1000 kN and 5000 kN (in tension) were applied. The evaluation of the cyclic test data clearly shows that the serviceability of the pile is unaffected by the cyclic loads. A feasibility study of the MIDOS pile in carbonate sands (Dog's Bay sand) was also explored in a laboratory test program. Carbonate sands are particularly relevant for drilled foundation solutions as the shaft friction of driven piles is typically very low due to the high radial contraction of such material adjacent to the pile shaft during impact driving. A finite element model (FEM) developed for this calcareous sand was used to compare the lab test results. The outcome of the laboratory testing program demonstrated that the MIDOS pile would have similar geotechnical and structural properties in both calcareous and siliceous deposits, suggesting that this novel offshore foundation type is suitable for a range of sand conditions.
- Published
- 2016
39. New certified reference materials and proficiency test for environmental radioactivity measurements
- Author
-
Branko Vodenik, Paul Doherty, Jasmina Kožar Logar, Abdulghani Shakhashiro, Mark A. Taggart, and Leen Verheyen
- Subjects
Anthropogenic radionuclides ,Engineering ,Waste management ,business.industry ,General Chemical Engineering ,010401 analytical chemistry ,General Chemistry ,Proficiency test ,01 natural sciences ,0104 chemical sciences ,Test (assessment) ,010309 optics ,Certified reference materials ,0103 physical sciences ,Activity concentration ,Forensic engineering ,Environmental radioactivity ,Water quality ,Radiochemical analysis ,Safety, Risk, Reliability and Quality ,business ,Instrumentation - Abstract
A reliable determination of natural and anthropogenic radionuclides in environmental samples is necessary to comply with the radiation protection and environmental regulations. This paper presents the results of the characterisation of massic activities of natural and anthropogenic radionuclides in soil and water matrices produced as test items to conduct the proficiency test ERAD-PT-2013. The proficiency test ERAD-PT-2013 was designed to investigate analytical performance in analysing both natural and anthropogenic radionuclides, to assist laboratories to identify analytical problems, and to improve the quality of measurement results. The proficiency test items, their spectral interferences and the activity concentration levels of the analytes were designed in a way to enable identification of potential analytical problems. Methodologies, data evaluation approach and evaluation of proficiency test results for each radionuclide are described and discussed.
- Published
- 2016
40. Field experiments on instrumented winged monopiles
- Author
-
Gerry Murphy, Paul Doherty, David Cadogan, and Kenneth Gavin
- Subjects
Engineering ,Wing ,Field (physics) ,business.industry ,0211 other engineering and technologies ,Foundation (engineering) ,Stiffness ,020101 civil engineering ,02 engineering and technology ,Structural engineering ,Field tests ,Geotechnical Engineering and Engineering Geology ,0201 civil engineering ,Earth and Planetary Sciences (miscellaneous) ,medicine ,Bending moment ,Steel plates ,Geotechnical engineering ,medicine.symptom ,business ,Seabed ,021101 geological & geomatics engineering - Abstract
This paper presents the results of field tests performed to investigate the field behaviour of winged-monopile foundations. The principle of the winged monopile is that steel plates are attached to a standard monopile (in the area near the ground or seabed surface) to increase the foundation stiffness and lateral resistance. The experimental tests described in this paper consisted of load tested driven instrumented prototype scale standard (reference) monopiles and piles with varying wing geometries at two sand sites. The overall load–displacement performance and mobilised bending moment profiles were examined to assess the potential benefits of adding wings to monopiles. Experimental p–y curves were developed for the piles to analyse how the presence of wings influenced the soil–structure interaction of the foundation system. The use of simplified p–y methods for predicting the winged-pile response was assessed. The experiments proved that the addition of wings greatly improved the lateral resistance and stiffness of the piles; however, the results suggest that conventional p–y curve methods are limited as they cannot account for the effect that the enhanced stresses mobilised by the wings have on the strength and stiffness response of the pile below the wing location.
- Published
- 2016
41. Mixed-in-place response of two carbonate sands
- Author
-
Diego Bellato, Paul Doherty, and Giovanni Spagnoli
- Subjects
Shearing (physics) ,Grout ,05 social sciences ,0211 other engineering and technologies ,Grain crushing ,02 engineering and technology ,engineering.material ,Geotechnical Engineering and Engineering Geology ,chemistry.chemical_compound ,chemistry ,0502 economics and business ,Earth and Planetary Sciences (miscellaneous) ,engineering ,Carbonate ,Geotechnical engineering ,Pile ,Calcareous ,050203 business & management ,Geology ,021101 geological & geomatics engineering - Abstract
At low confining stresses, calcareous sands exhibit many similar characteristics to silica sand deposits; however, at high stresses their shearing behaviour is quite different, exhibiting strong contraction due to grain crushing. Therefore, calcareous deposits can create significant challenges for driven pile foundations where the high installation energy causes particle damage, radial contraction and very low pile shaft friction. Drilled-and-grouted piles are often preferred in calcareous conditions. As an alternative to conventional foundation solutions, a novel pile has been developed based on the mixed-in-place technology. Two carbonate sands, the Dog's Bay foramol carbonate sand and the Ballyconneely sand, which is a calcitic carbonate algal sand, have been tested in the laboratory to investigate the geotechnical behaviour of these two sediments, which have different genesis and mechanical characteristics. The sands were mixed with concrete grout at cement-to-sand ratios of 15, 25 and 35%, and at a water-to-cement ratio of 0·4 to simulate the mixed-in-place pile installation technique. The results show similar geotechnical and structural performance for both sands.
- Published
- 2016
42. Design drivers for buoyant gravity-based foundations
- Author
-
Paul Doherty, Carlo Paulotto, Azadeh Attari, and Elena Reig Amoros
- Subjects
Gravity (chemistry) ,Engineering ,Buoyancy ,Renewable Energy, Sustainability and the Environment ,business.industry ,020209 energy ,02 engineering and technology ,engineering.material ,Free surface effect ,020401 chemical engineering ,Hull ,0202 electrical engineering, electronic engineering, information engineering ,Geotechnical engineering ,Metacentric height ,0204 chemical engineering ,business ,Failure mode and effects analysis - Published
- 2015
43. Estimation of the compression and tension loads for a novel mixed-in-place offshore pile for oil and gas platforms in silica and calcareous sands
- Author
-
Gerry Murphy, Azadeh Attari, Giovanni Spagnoli, and Paul Doherty
- Subjects
Petroleum engineering ,business.industry ,Fossil fuel ,Foundation (engineering) ,Full scale ,Geotechnical Engineering and Engineering Geology ,chemistry.chemical_compound ,Fuel Technology ,Lead (geology) ,chemistry ,Carbonate ,Submarine pipeline ,Geotechnical engineering ,Pile ,business ,Calcareous ,Geology - Abstract
The behaviour of calcareous (or carbonate) soils often presents significant foundation challenges regarding the construction of offshore hydrocarbon facilities. The presence of carbonate deposits at many strategic petrochemical reserves implies the necessity to study the behaviour of these soils. Driven piles, normally used as deep foundation elements for oil and gas platforms are normally avoided in these geological conditions as the impact operations lead to a degradation of the sand properties decreasing the shaft capacities. Drilled-and-grouted (D&G) piles overcome many of the technical limitations associated with impact piling in carbonate deposits, however D&G piles are both expensive and time consuming to construct. A novel mixed-in-place pile has been developed that provides a technically and economically efficient solution for carbonate soils. This technology minimizes the number of offshore operations and is therefore significantly quicker than D&G piles and therefore more cost effective. Several laboratory tests and in situ tests have been performed to assess its behaviour in both silica and carbonate sands. This research uses the results of recent laboratory experiments on the mixed-in-place pile on both silica and calcareous sands to develop a Finite Element Model (FEM) of full scale piles to test their potential bearing capacities for oil and gas platforms.
- Published
- 2015
44. Don’t Forget Time to Think!
- Author
-
Paul Doherty
- Published
- 2017
45. Patterns of population displacement during mega-fires in California detected using Facebook Disaster Maps
- Author
-
Seung Hee Kim, Shenyue Jia, Menas Kafatos, Paul Doherty, and Son V. Nghiem
- Subjects
FOS: Computer and information sciences ,education.field_of_study ,010504 meteorology & atmospheric sciences ,Emergency management ,Renewable Energy, Sustainability and the Environment ,business.industry ,Environmental resource management ,Population ,Public Health, Environmental and Occupational Health ,010501 environmental sciences ,01 natural sciences ,Representativeness heuristic ,Computer Science - Computers and Society ,First responder ,Geography ,Computers and Society (cs.CY) ,Population displacement ,Population growth ,Social media ,Temporal change ,business ,education ,0105 earth and related environmental sciences ,General Environmental Science - Abstract
Facebook Disaster Maps (FBDM) is the first platform providing analysis-ready population change products derived from crowdsourced data targeting disaster relief practices. We evaluate the representativeness of FBDM data using the Mann-Kendall test and emerging hot and cold spots in an anomaly analysis to reveal the trend, magnitude, and agglommeration of population displacement during the Mendocino Complex and Woolsey fires in California, USA. Our results show that the distribution of FBDM pre-crisis users fits well with the total population from different sources. Due to usage habits, the elder population is underrepresented in FBDM data. During the two mega-fires in California, FBDM data effectively captured the temporal change of population arising from the placing and lifting of evacuation orders. Coupled with monotonic trends, the fall and rise of cold and hot spots of population revealed the areas with the greatest population drop and potential places to house the displaced residents. A comparison between the Mendocino Complex and Woolsey fires indicates that a densely populated region can be evacuated faster than a scarcely populated one, possibly due to the better access to transportation. In sparsely populated fire-prone areas, resources should be prioritized to move people to shelters as the displaced residents do not have many alternative options, while their counterparts in densely populated areas can utilize their social connections to seek temporary stay at nearby locations during an evacuation. Integrated with an assessment on underrepresented communities, FBDM data and the derivatives can provide much needed information of near real-time population displacement for crisis response and disaster relief. As applications and data generation mature, FBDM will harness crowdsourced data and aid first responder decision-making., 16 pages with supplemental information
- Published
- 2020
46. Performance of CPT-based methods to assess monopile driveability in North Sea sands
- Author
-
Paul Doherty, T. Byrne, S. Chenicheri Pulukul, Paulo Cachim, Kenneth Gavin, and Luke J. Prendergast
- Subjects
Environmental Engineering ,0211 other engineering and technologies ,020101 civil engineering ,Ocean Engineering ,02 engineering and technology ,Base resistance-settlement ,Monopiles ,Static capacity ,0201 civil engineering ,Sand ,UWA-05 ,Geotechnical engineering ,Submarine pipeline ,Pile ,North sea ,IC-05 ,Offshore wind ,Geology ,021101 geological & geomatics engineering ,Pile driveability - Abstract
Offshore pile driving is a high-risk activity as delays can be financially punitive. Experience of pile driving for offshore jacket structures where pile diameters are typically < 2 m has led to the development of empirical pile driveability models with proven predictive capability. The application of these methods to larger diameter piles is uncertain. A major component of driveability models involves estimating the static resistance to driving, SRD, a parameter analogous to pile axial capacity. Recent research on axial capacity design has led to improved models that use Cone Penetration Test, CPT data to estimate pile capacity and include for the effects of friction fatigue and soil plugging. The applicability of these methods to estimating pile driveability for larger diameter piles is of interest. In this paper, recent CPT based axial capacity approaches, modified for mobilised base resistance and ageing, are applied to estimating driveability of 4.2 m diameter piles. A database of pile installation records from North sea installations are used to benchmark the methods. Accounting for factors such as pile ageing and the relatively low displacement mobilised during individual hammer blows improves the quality of prediction of pile driveability for the conditions evaluated in this study.
- Published
- 2018
47. 3D FEM approach for laterally loaded monopile design
- Author
-
David Igoe, Kenneth Gavin, Paul Doherty, and Gerry Murphy
- Subjects
business.industry ,0211 other engineering and technologies ,020101 civil engineering ,02 engineering and technology ,Structural engineering ,Field tests ,Soil reaction ,Monopiles ,Geotechnical Engineering and Engineering Geology ,Piling ,Finite element method ,0201 civil engineering ,Computer Science Applications ,Finite element modelling ,Offshore wind power ,Offshore foundations ,Cone penetration test ,Hardening (metallurgy) ,Lateral loading ,Fe model ,business ,Pile ,Geology ,021101 geological & geomatics engineering - Abstract
Over the past 5 years, a substantial research effort aimed at optimising the design of offshore wind turbines has led to significant reductions in the projected cost of developing offshore wind. Optimising the geotechnical design of these structures, through modern analysis techniques such as 3D Finite Element Modelling (FEM), has played a key role in helping to reduce costs. This paper presents a methodology for accurately modelling monopile behaviour using Cone Penetration Test (CPT) data to calibrate the non-linear stress dependent Hardening Soil (HS) model. The methodology is validated by comparing the modelled behaviour to field tests on a range of pile geometries. The paper also demonstrates how the soil-pile reaction response curves can be extracted from the FE model by isolating the stresses on each element of the pile. The contribution of each component to the overall lateral resistance is shown to vary with the pile geometry and is examined using the extracted soil reaction curves.
- Published
- 2018
48. SAFE-10-T: Safety of transport infrastructure on the TEN-T network
- Author
-
Irina Stipanović Oslaković, Pieter van Gelder, Marieke van der Tuin, Chiara Bianchizza, Colin Sims, Julie Clarke, Kenneth Gavin, Lorcan Connolly, Meho Saša Kovačević, Dražen Vinšćak, Timo Hartmann, Ruediger Ehlers, Stephen Wells, Miglė Paliukaite, Paul Doherty, Giel Klanker, and Rade Hajdin
- Subjects
Government ,Decision support system ,Risk analysis (engineering) ,Earthworks ,media_common.cataloged_instance ,Business ,European union ,Asset (computer security) ,Risk assessment ,Critical infrastructure ,Transport infrastructure ,media_common - Abstract
SAFE-10-T (Safety of Transport Infrastructure on the TEN-T Network) is a project funded by the European Union according to the Horizon 2020 Research and Innovation programme. The SAFE-10-T project is developing a global risk framework that will form the basis of an online Decision Support Tool (DST) to assist in decision-making regarding the management of transport infrastructure along the European TEN-T network. The DST is limited to road, rail and inland waterway transport infrastructure and will consider the multi-modality of these networks in terms of transport disruption due to asset failures. End-users will be able to assess the impact of interventions for infrastructure assets, including bridges, tunnels and earthworks and novel machine learning applications are being developed both at asset and network levels to provide real-time safety assessments for critical infrastructure assets. The targeted end-users are government authorities and infrastructure owners who will be able to use the outputs of the SAFE-10-T project to make strategic investment decisions regarding transport infrastructure. This paper provides an overview of the project, which commenced in May 2017. Further information is available at www.safe10tproject.eu.
- Published
- 2018
49. Smart Cities
- Author
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Stuart Borlase, Mehdi Ganji, Mohammad Shahidehpour, Mark Wells, Jessie Denver, Kip Harkness, Adrienne Grier, Daniel Kushner, Mahsa Nicknam, Dolan Beckel, Eric Lambert, Paul Doherty, Gary Wong, and Patrick Burgess
- Published
- 2017
50. The FAST multi-beam receiver design with RF over fiber link
- Author
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S. Mackay, Les Reilly, Zhang Haiyan, Peter Roush, M. Bowen, Douglas B. Hayman, Sean Severs, Robert D. Shaw, Paul Doherty, Yoon S. Chung, A. Dunning, K. Jeganathan, Jin Chengjin, and Henry Kanoniuk
- Subjects
Physics ,business.industry ,Aperture ,020208 electrical & electronic engineering ,Astrophysics::Instrumentation and Methods for Astrophysics ,Parabola ,020206 networking & telecommunications ,Reflector (antenna) ,02 engineering and technology ,Low-noise amplifier ,law.invention ,Telescope ,Optics ,Band-pass filter ,law ,0202 electrical engineering, electronic engineering, information engineering ,Metre ,Radio frequency ,business - Abstract
The Five hundred meter Aperture Spherical Telescope (FAST) has ambitious goals including deep neutral hydrogen surveys and searching for extra-terrestrial intelligence. The aperture of the main reflector is 500 m in diameter. The illuminated section of this reflector, which is 300 m in diameter, is deformed into a parabola. CSIRO has designed a multi-beam, dual polarized, cryostat-cooled receiver system which will be the largest receiver system in the telescope. The system contains 38 independent receiver chains that are optimized to operate in L-band with superior performance. This paper discusses the design challenges, build and the performance of the receiver system, particularly from Low Noise amplifier (LNA) to Digitizer.
- Published
- 2017
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