Digital Commons Network^™

Revisiting The Shortage Of Seafaring Officers: Insights From Chinese And Philippine Statistics, Lijun Tang

Plymouth Business School

This paper analyses statistical data on Chinese and Filipino seafarers released by their respective maritime authorities. The analysis suggests a mismatch in the market - an oversupply of cadets and junior officers coupled with a shortage of senior officers. This mismatch is underpinned by two structural issues in the labour market. Firstly, the occupational structure means that ships are likely to be manned by equal numbers of junior and senior officers. However, due to attrition, there are not enough junior officers in the industry to allow them to progress to senior ranks. Secondly, nationality segmentation creates a glass ceiling for …

The Impact Of Port Sector Reforms On The Productivity And Efficiency Of Container Ports In Lower-Middle-Income Countries: A Malmquist Productivity Index Approach, Caleb Danladi, Sarah Tuck, Panagiotis Tziogkidis, Lijun Tang, Chukwuneke Okorie

Plymouth Business School

Despite the extensive research on container port efficiency, the impact of port organizational reforms on productivity and efficiency in lower-middle-income countries remains underexplored, with most studies focusing on developed nations or specific regions. This study addresses this gap. It aims to analyse the productivity changes in container ports within world-wide lower-middle-income countries. The Malmquist Productivity Index, estimated using data envelopment analysis (DEA), was applied to a balanced panel of 39 container ports from 2001 to 2012 being a period that covers substantial port organisational reforms in the target population. The findings reveal an average productivity growth rate of 1.9% among …

Evaluating Sediment Storage Time For Improved Management Of River Basin Pollution, Enrique Munoz Arcos

School of Geography, Earth and Environmental Sciences Theses

Excess fine sediment supply and associated contaminants can have detrimental effects on water quality and river ecology, with sediment deposition on, and subsequent infiltration into, streambed substrate impacting riverine habitats. Significant research has assessed the magnitude, controls, and impacts of fine sediment in river channels. Assessment of the associated time scales, however, across these three domains has received less attention due in part to the complexity of river basin sediment dynamics. Fallout radionuclides (FRNs) applied as particle tracers in aquatic ecosystems can address this challenge. Herein, this research aimed to evaluate sediment storage time through application and development of FRN …

From Wells To Well-Being: Overcoming Challenges For Sustainability In Energy And Geosciences, Maria Angela Capello

School of Geography, Earth and Environmental Sciences Theses

This thesis explores and proposes solutions to critical gaps in the geosciences profession and the energy sector, summarizing and expanding upon 14 prior published works by the researcher. The gaps addressed are particular relevant to gender inclusion in oil and gas, communication of the value proposition of energy and geosciences to other disciplines, policy makers, and society at large, and how to expand geosciences positive impact in progressing the United Nations 17 Sustainable Development Goals (SDGs).The research methods utilized in the 14 selected prior published works include qualitative and quantitative research, namely: surveys, statistical analysis, literature review, archival research, focus …

Links Between Adhesion Signalling And Cell Cycle Regulation In Bladder Cancer Cells, Michael Jones

Peninsula Medical School Theses

Bladder cancer is the most common malignancy of the urinary tract. However, bladder cancer is a highly heterogenous disease and our understanding of the mechanisms that drive disease progression remain ill-defined. Additionally, a limited range of therapeutics and the dismal prognosis of patients with advanced disease highlights a need for better understanding of the mechanisms that drive bladder cancer progression, in order to identify new avenues for therapy. The extracellular matrix (ECM) represents a key component of the tumour microenvironment whose biochemical and mechanical characteristics contribute to all the hallmarks of cancer. However, the role of the ECM in bladder …

What Can Conjuring Tell Us About Cognition? The Future Of The Science Of Magic, Geoff G. Cole, Gustav Kuhn

School of Psychology

During the past 20 years a number of articles have appeared within a field that has become known as the “science of magic.” This subdiscipline of psychology posits that the ancient art of conjuring can be used to develop psychological theories and knowledge, and more than 150 peer-reviewed articles have now been published. In the current article, we critically evaluate what can be considered as the three central tenets of the discipline: that the methods used in magic can be incorporated within experimental research, that magicians have particular insight into human cognition and behavior, and that the deconstruction of magic …

Imagine For Tomorrow, What You Cannot Feel Now – The Role Of Anhedonia In Imagery-Enhanced Behavioral Activation, Max Heise, Julie L. Ji, Jessica Werthmann, Fritz Renner

School of Psychology

Preliminary evidence suggests that mental imagery-based elaboration of rewarding activities enhances anticipated pleasure, motivation, and behavioral engagement in non-clinical samples, but its effects in individuals experiencing anhedonia (loss of pleasure/interest) is unclear. Study 1 (N = 90) contrasted imagery-enhanced activity scheduling with two scheduling-only control conditions (Reminder/No Reminder Control) in an unselected sample. Study 2 (N = 108) compared imagery-enhanced activity scheduling with two control conditions (Neutral Imagery/Motivational Verbal Reasoning) in individuals experiencing mild to moderate anhedonia. Both studies measured changes in activity appraisal (anticipated pleasure, anticipated reward/mastery, motivation) in the lab, and behavioral engagement across a subsequent 7-day period. …

More Than Just A Magic Trick? Exploring An Audience's Supernatural Attributions For Magicians' Performances, Paul J. Silvia, Sara J. Crasson, Gil Greengross, Gustav Kuhn

School of Psychology

Performing magicians have long believed that some audience members attribute their magical effects to supernatural methods—to their use of “real magic”. In two samples of adults (n = 412 and 292), we explored personality traits and broader beliefs that might predict supernatural attributions for performance magic. Supernatural attributions were uncommon—many respondents wholly rejected the possibility that magicians' magic was sometimes real—but nevertheless highly variable. In Study 1, a greater belief that magic tricks at least sometimes involve supernatural powers was associated with relatively higher extraversion, higher neuroticism, and lower openness to experience. In Study 2, random forests suggested that supernatural …

Beyond The Drill: Understanding Empathy Among Undergraduate Dental Students, Muhammad Qasim Javed, Zaina Ahmad, Muhammad Muhammad, Kamran Ali, Arham Riaz, Rebecca Glanville

Peninsula Dental School

Introduction: Compassionate care and empathy are fundamental components of health care which contribute to the social construction of physician–patient relationship to meet the expectations of the patients. The aim of this study was to evaluate clinical empathy among undergraduate dental students at a University in the Middle East. Materials and Methods: It was a cross-sectional study which used purposive sampling to recruit undergraduate dental students from five academic years. The Jefferson Scale of Physician Empathy-Health Profession Students was used, a reliable 20-item tool with a total score ranging from 20 to 140. Data collection was done online using Google Forms. …

Changes In The Spatiotemporal Patterns Of Covid-19 In Japan From 2020 Through 2023, Atsuna Tokumoto, Kazuaki Jindai, Tomoki Nakaya, Mayuko Saito, Clive E Sabel, Hitoshi Oshitani

School of Geography, Earth and Environmental Sciences

BACKGROUND: The spread of coronavirus disease 2019 (COVID-19) varied among countries. The spatiotemporal trends of COVID-19 in Japan remain understudied. Therefore, this study aimed to conduct a detailed investigation of the spatiotemporal evolution of infections/deaths across prefectures in Japan, to analyze the changing patterns of COVID-19 circulation in metropolitan and nonmetropolitan areas.

METHODS: We extracted data from nationally represented open-source data from January 15, 2020, to May 9, 2023, and we calculated the incidence rate of infection and the mortality. Further the ratios were obtained by dividing those rates in prefectural level by those in national level to make them …

Autolyzed Brewer's Yeast Enhances Growth And Intestinal Health In Early Life Stages Of Nile Tilapia (Oreochromis Niloticus L.), Sheu Odu-Onikosi, Taofik Momoh, Ben Eynon, Nicola Pontefract, Victor Kuri, Holger Kühlwein, Daniel Merrifield

School of Biological and Marine Sciences

The early life stages of fish are critical for determining the overall productivity and sustainability of aquaculture operations. This study investigated the effects of dietary autolyzed brewer's yeast (ABY) on the growth performance and intestinal health of Nile tilapia fry (Oreochromis niloticus). A 35-day feeding trial with 480 Nile tilapia fry across 12 experimental tanks tested the effects of diets supplemented with 1, 2, and 4 g/kg of ABY, with a control diet for comparison. The results indicated that the diet which had 1 g/kg ABY supplementation (ABY1) significantly enhanced the weight gain and specific growth rate (SGR) while reducing …

Predicting Dune Evolution On A Regional Scale For Coastal Management, Liane M. Brodie, C. Stokes, G. Masselink, A. Konstantinou, T. Scott, T. Poate

School of Biological and Marine Sciences

Dunes provide a range of ecosystem services, including natural resilience against coastal flooding, and it is essential for proactive coastal zone management to forecast future dune behaviour as sea levels rise. However, dunes exhibit dynamic behaviours over a wide range of spatial and temporal scales, posing challenges for predicting their evolution. Here we demonstrate a high degree of variability in contemporary dune behaviour along a single coastal region, across 31 sites in Cornwall, southwest England. Rates of change varied widely, with sediment loss ranging from −12.4 m³/m/yr to a gain of +5.1 m³/m/yr, and dune retreat/advancement ranging from −3.7 m/yr …

Shifting Attention: Assessing Antennular ‘Gaze’ In The Hermit Crab Pagurus Bernhardus, Ari Drummond, John Spicer, Lucy Turner, Alexander Wilson, Mark Briffa

School of Biological and Marine Sciences

Attention (focused information gathering) is crucial for many cognitive processes. Traditionally dichotomised as reflexive or voluntary, behavioural research often relies on vision for assessments of attention. However, invertebrate information acquisition often utilises chemosensation or mechanosensation, potentially limiting the efficacy of a vision-based approach. We examined attention in Pagurus bernhardus hermit crabs, using antennules (the crustacean first antennae) as indicators of attentional shifts. Considering a change in flicking direction as analogous to a shift in gaze, we examined if hermit crabs show evidence of reflexive or voluntary attention. We exposed crabs to a chemosensory stimulus while manipulating factors influencing vulnerability (i.e., …

Hydrological Repair And Invasive Grass Removal Restore Rhizophora Racemosa Mangrove Communities In West Africa, Claudia M Agraz Hernández, Ebénézer Houndjinou, Jordan E Reyes Castellanos, Carlos A. Chan Keb, Juan Osti Saénz1, Julio C. Chávez Barrera, Janique Etienne, Romain L Glèlè Kakaï, Robert Puschendorf

School of Biological and Marine Sciences

Mangrove ecosystems face significant threats from climate change and human activities. In West Benin, the invasive grass Paspalum vaginatum disrupts sedimentation and hydrology, creating anoxic conditions and nutrient imbalances. To address this, we implemented a cost-effective restoration strategy focused on hydrological repair, engaging local communities to excavate 26 artificial channels and clear 19 existing ones, restoring tidal flow to 30 ha of degraded mangrove forest. Of this, 20 ha were planted with Rhizophora racemosa propagules, while 10 ha remained unplanted due to unsuitable micro-topographic conditions. This intervention, costing $1394.3 USD per hectare, adjusted sediment levels to match natural micro-topography, enabling …

Is Sparse Local Ecological Knowledge Accurate Enough For Policy? A Seagrass Mapping Case Study From Five Greek Islands In The Eastern Aegean Sea, Konstantis Alexopoulos, Tim J. Grandjean, Anastasia Miliou, Theodoros Tsimpidis, Abigail Mcquatters-Gollop

School of Biological and Marine Sciences

The low cost, high applicability and community-based nature of Local Ecological Knowledge (LEK) data for mapping marine benthic habitats has become increasingly popular in recent years. Nonetheless, due to persisting technocratic distrust of LEK often stemming from the unquantifiable nature of bias, the embedding of empirical data at policy levels often lags. Currently, protocols rely on high participation from stakeholders, however, such quotas are often unfeasible, with common limiting factors being the low numbers of knowledgeable individuals in remote parts of the world, and the lack of community trust in the conservation mechanism. In this study, we test whether data …

Numerical Modelling Of Gravel Transportation By A Tsunami With The Extended Xbeach-G, Masashi Watanabe, Gerd Masselink, Daisuke Ishimura, Masaki Yamada, Adam D. Switzer

School of Biological and Marine Sciences

Estimating coastal erosion by a tsunami is essential for land use planning, assessing hazards for current structures (e.g., coastal nuclear power plants), and for paleotsunami reconstruction. Such estimations are currently available only for sandy beaches, using sand sediment transport models, which are not applicable to gravel beaches, which are the most common beach type in high-latitude settings. This study extended the one-dimensional cross-shore XBeach-G model to account for two-dimensional gravel transport by a tsunami. First, this study confirmed that the extended XBeach-G model can simulate a time series of waveforms of solitary waves during laboratory experiments. The proposed model was …

The Use Of An In Chemico Digestibility Assay To Reduce The In Vivo Fish Bioaccumulation Testing Of Nanomaterials, Craig Mchardy, Nathaniel J. Clark, Robert Clough, Richard D. Handy

School of Biological and Marine Sciences

Currently for engineered nanomaterials (ENMs), there are no alternatives to bioaccumulation testing in fish as prescribed by OECD TG 305. New approaches are being sought, in order to reduce the numbers of animals used and address the ethical concerns associated with the use of vertebrates in such testing. This study aimed to demonstrate the value of an alternative method — the in chemico digestibility assay — as a tool to assess the bioaccumulation potential of ENMs. Titanium dioxide ENMs, or their equivalent bulk form, were incorporated onto a commercial fish diet and the fish digestion process was simulated in vitro …

Advancing Point-Of-Care Testing With Nanomaterials-Based Screen-Printing Electrodes, S. Nazir

School of Engineering, Computing and Mathematics

Although numerous studies have been conducted on multiple screen-printing electrodes (SPEs), little emphasis has been placed on systematically assessing scholarly work on nanomaterial-equipped SPEs in bioanalytical research. The fabrication of state-of-the-art portable screen-printing measuring devices represents significant disease monitoring and diagnosis advancements. This review classifies screen-printing electrodes based on the nanomaterials used. It discusses cost, regulatory approvals for portable screen-printing electrodes in point-of-care diagnostics, sensitivity, specificity, size reductions, and proposed solutions. It looks into the significance of new nanomaterials and substrates in fabricating point-of-care diagnostic devices and miniaturisation techniques. The review primarily focuses on the recent downsizing advances that have …

Community, Culture, And Capacity: Transformative Governance In The Gold Coast World Surfing Reserve, Kizzy Beaumont, Andrew Mckinnon, Scott Gillies

School of Art, Design and Architecture

Executive summary This report presents findings from interviews and a focus group held in September 2024 with stakeholders involved in the Gold Coast World Surfing Reserve (WSR). Participants shared perspectives on the evolution of the WSR, its governance structures, and its role in balancing surf culture, community needs, and environmental sustainability on one of Australia’s most urbanised coastlines.Participants praised the WSR Stewardship Committee, Council leadership, and strong data partnerships with universities. However, concerns were raised about increasing surf congestion, tourism pressure, development impacts, and the lack of formal legal protections for surf zones. The region’s surf culture was described as …

Relationships Between Sediment Size Distribution And Microplastic Abundance And Characteristics Along The Strandline Of A Sandy Embayment (Whitsand, Southwest England), Oliver J. Fenn, Edward J. Walklett, Andrew Turner

School of Geography, Earth and Environmental Sciences

Beach sediments taken from 1 m² areas of strandline across an embayment in southwest England (Whitsand) have been analysed for grain size distribution and elemental content. Large (1–5 mm) and small (< 1 mm) microplastics were isolated by sieving and flotation in NaBr solution, respectively, and characterised by size, shape, colour and polymeric makeup. Sediments displayed varying median diameters and degrees of sorting but distributions were always positively skewed. Concentrations of Fe, K, Mn and Ti were relatively invariant, but Ca concentrations exhibited heterogeneous distributions across the bay. Large microplastics were largely composed of polyolefin-based pre-production pellets, bio-beads and fragments whose numbers were correlated with each other. Positive and inverse relationships between beads and sediment skewness and sorting, respectively, suggests that deposition of this type of plastic is favoured where sediment is well-sorted and contains a high proportion of fine material. Small microplastics were dominated by fragments and fibres <200 μm in size composed of a broader array of polymers (including epoxy resin, polyetherimide and polyvinyl alcohol). Fibres exhibited an inverse relationship with bead and pellet abundance but there was no evidence of dependency on grain size distribution, and their presence is attributed to entrapment in interstitial spaces between sediment grains. Compositional differences between large (1–5 mm) and small (< 1 mm) microplastic fragments suggests they are derived from different sources, with the former coupled with pellet and bead deposition and the latter small enough to be retained in interstitial spaces with fibres. However, a positive relationship between mean (small) fragment size and median sediment diameter suggests that their retention is more constrained by interstitial space than fibres. The study provides evidence that microplastics of different size and shape behave differently but are, ultimately, related to or controlled by sediment size distribution in the coastal littoral zone.

Interactions Of Anthropogenic Microfibres With The Marine Macroalga, Ulva Lactuca, Adam Collins, Andrew Turner

School of Geography, Earth and Environmental Sciences

Little information exists on the interactions between microfibres (MFs) and marine macroalgae. In this study, the translucent green seaweed, Ulva lactuca, has been exposed to ∼2 mg L⁻¹ suspensions of MFs prepared from dryer lint under controlled conditions, with MFs on the alga surface and remaining in seawater subsequently counted and characterised. MFs were mainly <2 mm and cellulosic, and contained various additives and chemicals used in textile treatment. Interactions of MFs with U. lactuca were spatially heterogeneous but correcting for pre-existent MFs on the surface, mean trapping efficiencies on a dry mass and surface area basis were 252 mL g⁻¹ and 0.858 mL cm⁻², respectively. Despite this heterogeneity, there was evidence of differential trapping based on fibre colour and length. Interactions between the amphiphilic algal surface and MFs are likely both hydrophobic and electrostatic and are not fully reversible, with only …

Analytical Inconsistencies In The Measurement And Reporting Of Ip25, Ipso25 And Related Biomarkers For Paleo Sea Ice Reconstruction, Simon T. Belt, Lukas Smik

School of Geography, Earth and Environmental Sciences

IP₂₅ and related biomarkers are commonly used for Arctic and Antarctic sea ice reconstruction. With a growing number of laboratories performing their measurement, we reviewed many publications spanning the period 2007–2024 in order to assess analytical rigour. We found a number of common shortfalls in analytical protocols, or at least how they are reported, which may have important implications for future synthesis studies and meta-data analyses. Here, we outline some of these shortcomings and provide suggestions of how to improve both data acquisition and reporting.

The Necessity Of Electric School Bus: A Comparative Study Of Myanmar And Vietnam, Yang Ho Lee, Saeyeon Roh, Jin Woong Yoo

Plymouth Business School

Purpose: This research aims to ascertain key factors which influence the necessity of South Korean electric school buses in Myanmar and Vietnam. The interest in business sustainability and the demand for electric or safe school buses are increasing in Myanmar and Vietnam. Design/methodology/approach: As quantitative research, this study relies on a non-probability sampling method to collect data sets from experts in both countries. As this research covers three steps, including 1) literature reviews, 2) preliminary analysis and 3) Consistent Fuzzy Preference Relations (CFPR) analysis, robust outcomes were found and established in this study. Findings: Among five driving factors, including 1) …

Forming Of Economies Of Wellbeing Through Responsive Practice In Everyday Life, Julie Richardson

School of Art, Design and Architecture Theses

In recent years, most Western economies have increasingly focused on the narrow pursuit of economic growth with its unintended and undesirable impacts on the wellbeing of people and planet being well-documented. This has led to the growth in ‘alternative economics’ that addresses these critiques and proposes new economic models. However, alongside these critiques, there is another that questions the modern scientific approach underpinning economics, arguing that it overlooks the importance of lived experience, creating feelings of detachment in the economic practitioner as well as undermining the relevance and effectiveness of economics and policy making. The research develops a more responsive …

Mesotopia: Towards A Place Of Lyrical Inquiry, Tristan Verran

School of Art, Design and Architecture Theses

This research project is a comprehensive investigation into the practical applications of a theoretical place of creative intuition I have called ‘the mesotopia’. A mesotopia is a place between conceptual and physical terrains in which inter-object experiential encounters are turned into communicative events. Mesotopian thinking unsettles purely anthropocentric utopian or dystopian future visions, as well as romantic images of Arcadian pasts. I have been attending to the material present of our coastal regions while attempting to intuit, rather than imagine, concealed aspects of these compositional sites. This thesis argues that attending to local environments using a more embodied form of …

The Resistant Body In Sound: Cripping Music Creation Through Technology, Embodiment, And Disability Philosophy, Amble Ysgawen-Skuse

School of Art, Design and Architecture Theses

We are currently in a period where many music organisations are beginning to engage with disabled artists as a part of their diversity agenda. However, practice seems limited to questions of physical access to spaces and asks little around the philosophies of disability and how that might change the way that we think about working with disabled creatives. If issues of physical access are all that are taken into consideration we risk creating projects which embed ableists assumptions and practices into our disabled music making, which results in negative experiences for disabled artists. In order to make the progression of …

The Eastern Mediterranean Sea Energy Diplomacy: The Case Of Lebanon 2012-2022, Hoda Taktak

Plymouth Business School Theses

This thesis explores the geopolitical implications of energy discoveries in the Eastern Mediterranean Sea (EMS) region, with a particular focus on Lebanon's role within this complex dynamic. The research examines how energy governance, security challenges, and regional conflict and cooperation shape Lebanon's ability to leverage its energy resources from 2012 to 2022. Through interviews with thirty top professionals in the field, the study offers an in-depth examination of the evolving geopolitical and geoeconomic dynamics resulting from maritime boundary disputes, regional tensions, and Lebanon’s energy potential.While energy discoveries in the EMS region present significant opportunities, Lebanon faces challenges in unlocking its …

Stakeholder Engagement In Commercial Art Galleries In Damascus, Syria, Mohamadia Alnasan

Plymouth Business School Theses

Commercial art galleries (CAGs) are economic and cultural entities at the same time. They depend on stakeholder engagement to thrive and reach success and sustainability. This thesis researches stakeholder engagement in CAGs in Damascus, Syria. Regarding methodology, the thesis adopts case study as a research strategy covering nine commercial art galleries in Damascus as case studies. It conducted 27 face-to-face semi-structured interviews with gallerists and stakeholders, including artists, collectors, critics, and visitors, and 9 participant observation to collect on-site data. It uses thematic and content analysis. The thesis establishes stakeholders for CAGs, examines factors influencing stakeholder engagement according to gallerists …

An Analysis Of Container Port Performance In Lower-Middle-Income Countries; A Case Study Of Nigeria Container Ports, Caleb Danladi

Plymouth Business School Theses

Container ports play a vital role in international trade, facilitating the movement of goods and supporting economic development. However, much of the research focus has been on high-income countries, with limited attention given to the performance of ports in LMI countries.This study investigates the performance of container ports in LMI countries, with a specific focus on Nigeria’s container port operations from 2001 to 2012, using a mixed-methods approach. The research is divided into two phases. In the first phase, a two-stage analysis is employed. First, a non-parametric Data Envelopment Analysis (DEA) and the Malmquist Productivity Index (MPI) are used to …

The Role Of Sociocultural Factors In Saudi Consumers’ Attitudes Towards Social Media Advertising And Purchase Intentions Within The Clothing Industry, Lamis Aldawish

Plymouth Business School Theses

Social media advertising (SMA) significantly influences consumer purchase behaviour in Saudi Arabia, particularly in the fashion industry. However, Saudi consumers’ attitudes towards fashion advertisements on social media are shaped by sociocultural factors, given the country’s deep-rooted cultural and Islamic principles. With Saudi Vision 2030 driving societal changes and transforming the fashion industry, younger generations (under 45 years) are developing different attitudes compared to older generations (over 45 years). Although notable changes have occurred, existing literature lacks sufficient exploration of how sociocultural factors influence Saudi consumers’ attitudes towards social media advertising and their intentions to purchase clothing. Gaining insight into these …