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2022

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Impact Of Water-Sediment Diversion And Afflux On Erosion-Deposition In The Luoshan-Hankou Reach, Middle Yangtze River, China, Boyuan Zhu, Jianhao Qin, Yitian Li, Gexuanzi Luo, Qi Xu, Lingfeng Liu, Alistair G.L. Borthwick Jan 2022

Impact Of Water-Sediment Diversion And Afflux On Erosion-Deposition In The Luoshan-Hankou Reach, Middle Yangtze River, China, Boyuan Zhu, Jianhao Qin, Yitian Li, Gexuanzi Luo, Qi Xu, Lingfeng Liu, Alistair G.L. Borthwick

School of Engineering, Computing and Mathematics

It is not yet fully understood how water-sediment diversion and afflux along a mainstream reach of a river affect erosion-deposition in downstream reaches. This study focuses on the Luoshan-Hankou mainstream reach of the middle Yangtze River, China. The Luoshan-Hankou reach is vitally important for flood control, being located downstream of three diversion mouths and an afflux outlet along the Jingjiang reach. We establish empirical formulae for sediment transport rates at boundary cross-sections, and hence estimate the amount and proportion of erosion-deposition and its relative increase (termed erosion-deposition promotion) in the Luoshan-Hankou reach. We then propose critical net water supplies from …

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Human Affinity For Rivers, Yichu Wang, Alistair G.L. Borthwick, Jinren Ni Jan 2022

Human Affinity For Rivers, Yichu Wang, Alistair G.L. Borthwick, Jinren Ni

School of Engineering, Computing and Mathematics

Human civilization prospers along rivers worldwide. Here, we investigated human–river relations by revealing the linkage between water and habitability for human settlements, and socioeconomic and cultural development across China. We found that human–water co-occurrence relationships are self-similar over sub-basins for different scales of stream-order in the river networks. According to the earlier complete demographic census conducted during the reign of the Qing Dynasty (1776), there has been a general tendency for inhabitants to live close to rivers, characterized by population density associated with habitability cored by water under a near-natural state, which still remains to date (2019) even after long-term …

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A Magnetic Nanoparticle-Doped Photopolymer For Holographic Recording, Muhammad Irfan, Suzanne Martin, Muhammad Ahmed Obeidi, Scott Miller, Frank Kuster, Dermot Brabazon, Izabela Naydenova Jan 2022

A Magnetic Nanoparticle-Doped Photopolymer For Holographic Recording, Muhammad Irfan, Suzanne Martin, Muhammad Ahmed Obeidi, Scott Miller, Frank Kuster, Dermot Brabazon, Izabela Naydenova

Articles

Functionalised holograms are important for applications utilising smart diffractive optical elements for light redirection, shaping and in the development of sensors/indicators. This paper reports on holographic recording in novel magnetic nanocomposites and the observed temperature change in dry layers and liquid samples exposed to alternating magnetic field (AMF). The nanocomposite consists of N-isopropylacrylamide (NIPA)-based polymer doped with magnetic nanoparticles (MNPs), and local heating is achieved through magnetic induction. Here, volume transmission holographic gratings (VTHGs) are recorded with up to 24% diffraction efficiency (DE) in the dry layers of magnetic nanocomposites. The dry layers and liquid samples are then exposed to …

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Evaluation Of Small‐Scale Yielding Boundary Using Digital Image Correlation Results, Jm Vasco‐Olmo, Fa Díaz, Dm Neto, Er Sérgio, Fv Antunes, Mn James Jan 2022

Evaluation Of Small‐Scale Yielding Boundary Using Digital Image Correlation Results, Jm Vasco‐Olmo, Fa Díaz, Dm Neto, Er Sérgio, Fv Antunes, Mn James

School of Engineering, Computing and Mathematics

No abstract provided.

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Experimental Evaluation Of Plastic Wake On Growing Fatigue Cracks From The Analysis Of Residual Displacement Fields, Jm Vasco‐Olmo, Francisco A. Díaz, A Camacho‐Reyes, Neil James, Fernando V. Antunes Jan 2022

Experimental Evaluation Of Plastic Wake On Growing Fatigue Cracks From The Analysis Of Residual Displacement Fields, Jm Vasco‐Olmo, Francisco A. Díaz, A Camacho‐Reyes, Neil James, Fernando V. Antunes

School of Engineering, Computing and Mathematics

A growing fatigue crack gives rise to a plastically deformed wake of material that envelops the crack. In this work, the plastic wake extent during fatigue crack growth is experimentally quantified by analyzing the crack tip displacement fields measured with digital image correlation. A novel technique based on use of a yield criterion is proposed that uses the undamaged state of the specimen as the reference state in the image processing. The plastic wake was identified by differentiation of the residual displacement fields obtained with a near-zero load level to avoid any rigid body motion. The plastic wake extent was …

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Assessment Of Equivalent Substrate Stiffness And Mechanical Properties Of Sustainable Alkali-Activated Concrete Containing Recycled Concrete Aggregate, Nattapong Damrongwiriyanupap, Todsaporn Srikhamma, Chittinat Plongkrathok, Tanakorn Phoo-Ngernkham, Worathep Sae-Long, Sakonwan Hanjitsuwan, Piti Sukontasukkul, Long Yuan Li, Prinya Chindaprasirt Jan 2022

Assessment Of Equivalent Substrate Stiffness And Mechanical Properties Of Sustainable Alkali-Activated Concrete Containing Recycled Concrete Aggregate, Nattapong Damrongwiriyanupap, Todsaporn Srikhamma, Chittinat Plongkrathok, Tanakorn Phoo-Ngernkham, Worathep Sae-Long, Sakonwan Hanjitsuwan, Piti Sukontasukkul, Long Yuan Li, Prinya Chindaprasirt

School of Engineering, Computing and Mathematics

The effects of using recycled concrete aggregate (RCA) as coarse aggregate on the equivalent substrate stiffness and mechanical properties of sustainable alkali-activated concrete were investigated in this paper. High-calcium fly ash (HFA) and commercial silica fume (SF) were used as the precursors for producing the alkali-activated high-calcium fly ash concrete (AAHFAC). Sodium hydroxide (SH) and sodium silicate (SS) solutions were used as alkaline activator solutions with the constant SS/SH ratio of 1.0 and liquid-binder (L/B) ratio of 0.50. The natural coarse aggregate (NCA) used in this study was crushed limestone and replaced with RCA at the rates of 0%, 20%, …

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Characterization Of Non‐Planar Crack Tip Displacement Fields Using A Differential Geometry Approach In Combination With 3d Digital Image Correlation, A Camacho‐Reyes, Jm Vasco‐Olmo, Mn James, Fa Diaz Jan 2022

Characterization Of Non‐Planar Crack Tip Displacement Fields Using A Differential Geometry Approach In Combination With 3d Digital Image Correlation, A Camacho‐Reyes, Jm Vasco‐Olmo, Mn James, Fa Diaz

School of Engineering, Computing and Mathematics

No abstract provided.

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Modelling Of Convection, Diffusion And Binding Of Chlorides In Concrete During Wetting-Drying Cycles, Long-Yuan Li, Dawang Li, Ping Li, Yao-Cheng Wang Jan 2022

Modelling Of Convection, Diffusion And Binding Of Chlorides In Concrete During Wetting-Drying Cycles, Long-Yuan Li, Dawang Li, Ping Li, Yao-Cheng Wang

School of Engineering, Computing and Mathematics

Moisture convection in concrete is an important factor affecting the chloride diffusion in concrete. This paper presents a comprehensive study on the transport of moisture, carbon dioxide and chloride ions in concrete when subjected to wetting and drying cycles. A numerical model considering not only the transport of individual components but also the interaction between them is developed. The latter includes the concrete carbonation, chloride binding, the effect of concrete carbonation on chloride binding capacity, and the time-varying boundary conditions of carbon dioxide and chloride caused due to wetting and/or drying. The results obtained from the study demonstrate that when …

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Towards A New Methodology For The Characterisation Of Crack Tip Fields Based On A Hybrid Computational Approach, A Camacho-Reyes, Jm Vasco-Olmo, Mn James, Fa Diaz Jan 2022

Towards A New Methodology For The Characterisation Of Crack Tip Fields Based On A Hybrid Computational Approach, A Camacho-Reyes, Jm Vasco-Olmo, Mn James, Fa Diaz

School of Engineering, Computing and Mathematics

No abstract provided.

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The Importance Of The Job Role In Social Media Cybersecurity Training, Salamah F Ben, Ma Palomino, M Papadaki, S Furnell Jan 2022

The Importance Of The Job Role In Social Media Cybersecurity Training, Salamah F Ben, Ma Palomino, M Papadaki, S Furnell

School of Engineering, Computing and Mathematics

No abstract provided.

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Embrittlement Failure Of 51crv4 Leaf Springs, Mn James, Dg Hattingh, L Matthews Jan 2022

Embrittlement Failure Of 51crv4 Leaf Springs, Mn James, Dg Hattingh, L Matthews

School of Engineering, Computing and Mathematics

High strength quenched and tempered alloys are used in the manufacture of leaf springs, and peening techniques are used to induce compressive residual stresses on the tension surface of the individual leaves to resist fatigue crack growth. However, the extent of such residual stresses is usually limited to around 0.1–0.2 mm deep. Their beneficial effect can therefore be negated by corrosion pitting, while high strength steels are known to also be susceptible to environmental embrittlement in high chloride environments. This case study deals with an interesting example of environmental embrittlement of multileaf springs reportedly made from 60Si2Mn steel, but actually …

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Analysis Of Electrical Conductivity Of Carbon Nanotube-Reinforced Two-Phase Composites, Z Li, L-Y Li Jan 2022

Analysis Of Electrical Conductivity Of Carbon Nanotube-Reinforced Two-Phase Composites, Z Li, L-Y Li

School of Engineering, Computing and Mathematics

No abstract provided.

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Surface Quality Augmentation For Metalworking Industry With Pix2pix, Dirk Hölscher, Christoph Reich, Martin Knahl, Frank Gut, Nathan Clarke Jan 2022

Surface Quality Augmentation For Metalworking Industry With Pix2pix, Dirk Hölscher, Christoph Reich, Martin Knahl, Frank Gut, Nathan Clarke

School of Engineering, Computing and Mathematics

No abstract provided.

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The Numerical Re-Creation Of Experimentally Generated Nonlinear Irregular Wave Fields Using A Time-Reversal Approach, S. Draycott, P. K. Stansby, M. L. Mcallister, T. Davey, L. Jordan, T. Tosdevin, M. Hann Jan 2022

The Numerical Re-Creation Of Experimentally Generated Nonlinear Irregular Wave Fields Using A Time-Reversal Approach, S. Draycott, P. K. Stansby, M. L. Mcallister, T. Davey, L. Jordan, T. Tosdevin, M. Hann

School of Engineering, Computing and Mathematics

Physical model testing in irregular waves is often used to assess performance, and validate numerical models, of offshore structures and platforms, yet the full phase-resolved experimental conditions including reflections and correct nonlinearity are seldom replicated numerically. This results in uncertainty in numerical model validation, particularly when considering extremes. Herein we assess a time-reversal approach for the accurate numerical replication of experimentally generated wave fields. Fifteen irregular sea states, including steep and breaking cases, are generated in two large laboratories in the UK and replicated numerically using the time-domain nonlinear potential flow code OceanWave3D. Through statistical, temporal, and spatial analysis, the …

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“What Works” Registries Of Interventions To Improve Child And Youth Psychosocial Outcomes: A Critical Appraisal, Nick Axford, Louise Morpeth, Gretchen Bjornstad, Tim Hobbs, Vashti Berry Jan 2022

“What Works” Registries Of Interventions To Improve Child And Youth Psychosocial Outcomes: A Critical Appraisal, Nick Axford, Louise Morpeth, Gretchen Bjornstad, Tim Hobbs, Vashti Berry

Peninsula Medical School

The last decade or more has seen a proliferation of online registries of evidence-based interventions designed to improve child and youth psychosocial outcomes. The purpose of these resources is typically to help decision-makers make sense of the evidence and thereby inform their decision-making about investment in interventions. Most registries are underpinned by standards of evidence, which are used to guide the rating of programs by a panel of experts. While supporters extol the influence of these initiatives in terms of making commissioners more discriminating about what they invest in, detractors contend that they stifle innovation and embody an unduly narrow …

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The Art Of Poetry And Its Place In The History Of The Coordinating Research Councils Real World Emissions Workshop {Poster}, Gary A. Bishop Jan 2022

The Art Of Poetry And Its Place In The History Of The Coordinating Research Councils Real World Emissions Workshop {Poster}, Gary A. Bishop

Fuel Efficiency Automobile Test Publications

No abstract provided.

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Portfolio Optimisation Using Genetic Algorithms And Copula Financial Models, Tahani Alotaibi Jan 2022

Portfolio Optimisation Using Genetic Algorithms And Copula Financial Models, Tahani Alotaibi

School of Engineering, Computing and Mathematics Theses

Portfolio optimisation aims to efficiently find optimal proportions of portfolio assets, given certain constraints, and has been well-studied (Jin et al. 2016). While portfolio optimisation ascertains asset combinations most suited to investor requirements, numerous real-world problems impact its simplicity, e.g., investor preferences. Trading restrictions are also commonly faced, and must be met. However, in adding constraints to Markowitz’s basic mean-variance model, problem complexity increases, causing difficulties for exact optimisation approaches to find large problem solutions inside reasonable timeframes. The concern of this study concern is portfolio optimisation under three real-world constraints, using Markowitz’s mean-variance portfolio optimisation problem to obtain optimal …

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Tackling Big Data Variety Using Metadata, Georgios Vranopoulos Jan 2022

Tackling Big Data Variety Using Metadata, Georgios Vranopoulos

School of Engineering, Computing and Mathematics Theses

The creation of new knowledge from manipulating and analysing existing knowledge is one of the primary objectives of any cognitive system. Out of the Big Data governing Vs, namely Volume, Velocity, Variety, Veracity, Validity, Volatility and Value, the first three are considered the primary ones. Most of the effort on Big Data research has been focussed upon Volume and Velocity, while Variety, “the ugly duckling” of Big Data, is often neglected and difficult to solve. A principal challenge with Variety is being able to understand and comprehend the data in gaining insight. Organisations have been investing in analytics relying on …

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Physical Modelling Of Wave Group Interactions With A Vertical Wall, William Mortimer Jan 2022

Physical Modelling Of Wave Group Interactions With A Vertical Wall, William Mortimer

School of Engineering, Computing and Mathematics Theses

Coastal communities are becoming increasingly exposed to wave-induced flood events due to climate change. Accurate prediction of wave-structure interactions are vital in order to achieve long lasting and economical defences for such communities. Amongst the interactions of importance for design are wave runup and force. This thesis describes data from experiments in laboratory flumes. The novel contribution is with application and validation of second-order wave generation for experiments in shallow to intermediate water depth. The thesis builds on a substantial body of work by coastal engineers to validate focused wave groups, established in offshore engineering, for coastal experiments. Free error …

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Flexible Goal-Directed Manipulation Of Representations: Computational Models Of Healthy And Pathological Human Cognition, Giovanni Granato Jan 2022

Flexible Goal-Directed Manipulation Of Representations: Computational Models Of Healthy And Pathological Human Cognition, Giovanni Granato

School of Engineering, Computing and Mathematics Theses

The brain is able to manipulate itself, adapting its internal world in a changing environment. In particular it continuously manipulates its representations to achieve goals. This competence is supported by many neurocognitive high-order processes that interact during the performance of a goal-directed behaviour (e.g. attention processes, executive functions, motivational systems). Overall, adult humans often face a new problem trough a change of the `perceptual point of view' (i.e. a representational change), rather then an extended research of the correct action to perform. On the other hand, infants and children contemporary develop motor competence and task-directed perceptual representations (e.g. categorical perception). …

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A Neural Network-Based Model For Lower Limb Continuous Estimation Against The Disturbance Of Uncertainty, Wanting Li, Keping Liu, Zhongbo Sun, C Li, Yuanyuan Chai, Jian Gu Jan 2022

A Neural Network-Based Model For Lower Limb Continuous Estimation Against The Disturbance Of Uncertainty, Wanting Li, Keping Liu, Zhongbo Sun, C Li, Yuanyuan Chai, Jian Gu

School of Engineering, Computing and Mathematics

In this paper, a novel prediction model is proposed to estimate human continuous motion intention using a fuzzy wavelet neural network (FWNN) and a zeroing neural network (ZNN). During walking, seven channel surface electromyography (sEMG) signals and motion data of hip and knee are collected, and two signals are selected and processed from the seven muscles based on physiological and correlation analysis. Then, FWNN is built as an intention recognition model, with sEMG signals as input and physical hip and knee information as output. Meanwhile, ZNN is exploited into the FWNN model, forming a hybrid model to eliminate the prediction …

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High-Quality Reconstruction Of China’S Natural Streamflow, Chiyuan Miao, Jiaojiao Gou, Bojie Fu, Qiuhong Tang, Q Duan, Z Chen, Huimin Lei, J Chen, J Guo, Alistair G.L. Borthwick, Wenfeng Ding, X Duan, Yungang Li, Dongxian Kong, X Guo, Jingwen Wu Jan 2022

High-Quality Reconstruction Of China’S Natural Streamflow, Chiyuan Miao, Jiaojiao Gou, Bojie Fu, Qiuhong Tang, Q Duan, Z Chen, Huimin Lei, J Chen, J Guo, Alistair G.L. Borthwick, Wenfeng Ding, X Duan, Yungang Li, Dongxian Kong, X Guo, Jingwen Wu

School of Engineering, Computing and Mathematics

No abstract provided.

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Magnetic, Optical And Phase Transformation Properties Of Fe And Co Doped Vo2(A) Nanobelts, Ss Saeidi, B Vaseghi, G Rezaei, H Khajehsharifi, D Jenkins Jan 2022

Magnetic, Optical And Phase Transformation Properties Of Fe And Co Doped Vo2(A) Nanobelts, Ss Saeidi, B Vaseghi, G Rezaei, H Khajehsharifi, D Jenkins

School of Engineering, Computing and Mathematics

In this work, the effects of Fe and Co dopants on the optical bandgap and structural, morphological, and magnetic properties of VO2(A) nanobelts with rectangular cross-sections were studied. The optimized hydrothermal method with proper parameters was used to synthesize the samples. The XRD analyses show that the hydrothermal method promotes the formation of VO2(B) rather than the usual VO2(A) and causes the tetragonal-monoclinic transformation in VO2. Furthermore, expanding the VO2 lattice constant by dopants reveals that Fe3+ and Co2+ are successfully substituted into the lattice sites of V4+. Also, obtained results indicate the optical band gap increment with dopants and …

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Adaptation Of The Revised Universal Soil Loss Equation (Rusle) To Soil Loss Modeling In A Semi-Arid Watershed: A Case Study From Western High Atlas, Morocco, Latifa Bou-Imajjane, Mhamed Alaeddine Belfoul, Martin Stokes, Abdenbi Elaloui, Adnane Labbaci, Ayady H El, Yassine Ez-Zaouy Jan 2022

Adaptation Of The Revised Universal Soil Loss Equation (Rusle) To Soil Loss Modeling In A Semi-Arid Watershed: A Case Study From Western High Atlas, Morocco, Latifa Bou-Imajjane, Mhamed Alaeddine Belfoul, Martin Stokes, Abdenbi Elaloui, Adnane Labbaci, Ayady H El, Yassine Ez-Zaouy

School of Geography, Earth and Environmental Sciences

No abstract provided.

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Mixture Toxicity Of Tio2 Nps And Tetracycline At Two Trophic Levels In The Marine Ecosystem: Chlorella Sp. And Artemia Salina, V Thiagarajan, R Seenivasan, D Jenkins, N Chandrasekaran, A Mukherjee Jan 2022

Mixture Toxicity Of Tio2 Nps And Tetracycline At Two Trophic Levels In The Marine Ecosystem: Chlorella Sp. And Artemia Salina, V Thiagarajan, R Seenivasan, D Jenkins, N Chandrasekaran, A Mukherjee

School of Engineering, Computing and Mathematics

No abstract provided.

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Correct Generation Of The Bound Set-Down For Surface Gravity Wave Groups In Laboratory Experiments Of Intermediate To Shallow Depth, William Mortimer, Alison Raby, Alessandro Antonini, Deborah Greaves, Den Bremer T Van Jan 2022

Correct Generation Of The Bound Set-Down For Surface Gravity Wave Groups In Laboratory Experiments Of Intermediate To Shallow Depth, William Mortimer, Alison Raby, Alessandro Antonini, Deborah Greaves, Den Bremer T Van

School of Engineering, Computing and Mathematics

No abstract provided.

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Drone-Based Large-Scale Particle Image Velocimetry Applied To Tidal Stream Energy Resource Assessment, Iain Fairley, Benjamin J. Williamson, Jason Mcilvenny, Nicholas King, Ian Masters, Matthew Lewis, Simon Neill, David Glasby, Daniel Coles, Ben Powell, Keith Naylor, Max Robinson, Dominic E. Reeve Jan 2022

Drone-Based Large-Scale Particle Image Velocimetry Applied To Tidal Stream Energy Resource Assessment, Iain Fairley, Benjamin J. Williamson, Jason Mcilvenny, Nicholas King, Ian Masters, Matthew Lewis, Simon Neill, David Glasby, Daniel Coles, Ben Powell, Keith Naylor, Max Robinson, Dominic E. Reeve

School of Engineering, Computing and Mathematics

Resource quantification is vital in developing a tidal stream energy site but challenging in high energy areas. Drone-based large-scale particle image velocimetry (LSPIV) may provide a novel, low cost, low risk approach that improves spatial coverage compared to ADCP methods. For the first time, this study quantifies performance of the technique for tidal stream resource assessment, using three sites. Videos of the sea surface were captured while concurrent validation data were obtained (ADCP and surface drifters). Currents were estimated from the videos using LSPIV software. Variation in accuracy was attributed to wind, site geometry and current velocity. Root mean square …

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Crowdsourcing Platform For Qoe Evaluation For Cloud Multimedia Services, A Laghari, Hui He, Asiya Khan, R Laghari, Shoulin Yin, Jiachi Wang Jan 2022

Crowdsourcing Platform For Qoe Evaluation For Cloud Multimedia Services, A Laghari, Hui He, Asiya Khan, R Laghari, Shoulin Yin, Jiachi Wang

School of Engineering, Computing and Mathematics

This paper presents a novel web-based crowdsourcing platform for the assessment of the subjective and objective quality of experience (QoE) of the video service in the cloud-server environment. The user has the option to enter subjective QoE data for video service by filling out a web questionnaire. The objective QoE data of the cloud-server, network condition, and the user device is automatically captured by the crowdsourcing platform. Our proposed system collects both objective and subjective QoE simultaneously in real-time. The paper presents the key technologies used in the development of the platform and describes the functional requirements and design ideas …

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Investigation Of Wave-Driven Hydroelastic Interactions Using Numerical And Physical Modelling Approaches, S. A. Brown, N. Xie, M. R. Hann, D. M. Greaves Jan 2022

Investigation Of Wave-Driven Hydroelastic Interactions Using Numerical And Physical Modelling Approaches, S. A. Brown, N. Xie, M. R. Hann, D. M. Greaves

School of Engineering, Computing and Mathematics

Wave-driven hydroelasticity is of great importance to a wide range of applications within offshore and coastal engineering. Harnessing the benefits of hydroelasticity or minimising its impacts, depending on the application, has recently led to substantial investment in research effort in this field. However, the complex and strongly-coupled nature of the problem generally make the impacts very case specific, highlighting the importance of accurate numerical tools for assessing the impact on a case-by-case basis. Therefore, this study aims to provide novel experimental data to assist with the development of a coupled numerical methodology for simulating fully nonlinear hydroelastic interactions with highly-flexible …

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Liquid Air Energy Storage For Ancillary Services In An Integrated Hybrid Renewable System, Mostafa Kheshti, Xiaowei Zhao, Ting Liang, Binjian Nie, Yulong Ding, Deborah Greaves Jan 2022

Liquid Air Energy Storage For Ancillary Services In An Integrated Hybrid Renewable System, Mostafa Kheshti, Xiaowei Zhao, Ting Liang, Binjian Nie, Yulong Ding, Deborah Greaves

School of Engineering, Computing and Mathematics

High shares of intermittent renewable sources cause volatile frequency movements that could jeopardize the continuous operation of the grid. Liquid Air Energy Storage (LAES) is an emerging technology that not only helps with decarbonisation of energy sectors, but also has potentials for reliable ancillary services. In this paper, a hybrid LAES, wind turbine (WT), and battery energy storage system (BESS) is used to investigate their contributions in fast frequency control. The inertial control, droop control and combined inertial and droop terms are applied on each source of the hybrid renewable system and a comprehensive analysis is conducted to study their …

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