Key Findings Research Articles

Smart Ports in Industry 4.0: A Systematic Literature Review

Background: Information and communication technologies (ICT) have introduced “smart” concepts across industries, including ports. Smart ports, leveraging IoT, cybersecurity, and cloud computing, are trending in maritime operations. They optimize data for informed decision-making, cutting costs, enhancing efficiency, mitigating risks, and fostering growth. Methods: To consolidate knowledge in this area, we are conducting a systematic literature review and meta-analysis using the PRISMA framework. Our goal is to synthesize existing insights, minimize biases, increase reliability, and effectively communicate our findings. To address the research needs mentioned, the current study focuses on implementing a systematic literature review (SLR). Results: The goals of this review are: (i) to present and describe the main categories and themes within the research topic, and (ii) to identify research gaps that will aid future research. Key findings include the identification and classification of current literature trends in the smart port performance evaluation framework and the examination of fundamental themes discussed within this area of research. Conclusions: In our review, we emphasize the smart port concept, clarifying its common interpretations amid the industry 4.0 revolution. We discuss recent advancements in emerging technologies and identify key challenges driving researchers’ exploration of the evolving smart port landscape.

Enhancing Antimicrobial and Fastness Properties of Silk and Lyocell Fabric by Dyeing with Azadirachta indica and Mordanting with Citrus limon Extract

Antimicrobial resistance presents a substantial global health challenge, prompting the exploration of innovative strategies to combat pathogenic bacteria. Within this context, considerable attention has been directed towards textile materials treated with antimicrobial agents for their potential to mitigate the spread of infectious diseases. This research sought to investigate the influence of Neem dyeing and Lemon mordanting on enhancing the innate antimicrobial properties of Silk and Lyocell fabric. Textile materials underwent mordanting exclusively with natural agents, such as citrus lemon extract, to enhance dye adherence. The dyeing process involved the use of Azadirachta indica dye obtained through aqueous boiling, applied to lyocell and silk fabrics under various parameters. The key findings revealed a significant augmentation in the antimicrobial effectiveness of lyocell and silk fabrics following Neem dyeing and Lemon mordanting. Optimized conditions, including prolonged dyeing time, elevated temperatures, and constant dye concentrations, notably improved inhibition percentages against common pathogens like Staphylococcus aureus and Klebsiella pneumoniae. Furthermore, the study assessed the washing and perspiration fastness properties of silk and lyocell fabrics in accordance with established standards. In conclusion, the integration of Neem dyeing and Lemon mordanting emerges as a promising method to significantly enhance the antimicrobial efficacy of Lyocell and silk fabrics. This approach opens avenues for the development of textiles with heightened infection control properties, particularly in sectors focused on public health and hygiene. The evaluation of fastness properties also yielded excellent results, further supporting the viability of this method in academic and practical contexts. Considering the global challenge of antimicrobial resistance, adopting such innovative strategies in textile treatment can contribute significantly to the development of effective and sustainable solutions. Future research endeavours may explore additional applications and variations of this method, ensuring its adaptability and widespread implementation in diverse settings.

Multifunctional MXene-Based Platforms for Soft and Bone Tissue Regeneration and Engineering.

MXenes and their composites hold great promise in the field of soft and bone tissue regeneration and engineering (TRE). However, there are challenges that need to be overcome, such as ensuring biocompatibility and controlling the morphologies of MXene-based scaffolds. The future prospects of MXenes in TRE include enhancing biocompatibility through surface modifications, developing multifunctional constructs, and conducting in vivo studies for clinical translation. The purpose of this perspective about MXenes and their composites in soft and bone TRE is to critically evaluate their potential applications and contributions in this field. This perspective aims to provide a comprehensive analysis of the challenges, advantages, limitations, and future prospects associated with the use of MXenes and their composites for soft and bone TRE. By examining the existing literature and research, the review seeks to consolidate the current knowledge and highlight the key findings and advancements in MXene-based TRE. It aims to contribute to the understanding of MXenes' role in promoting soft and bone TRE, addressing the challenges faced in terms of biocompatibility, morphology control, and tissue interactions.

Numerical investigation of premixed combustion of producer gas with hydrogen injection in a cyclonical chamber

ABSTRACT This paper employs computational fluid dynamics (CFD) simulations with an eddy dissipation concept model (EDC) and a skeletal reaction mechanism (SK17) to analyze the impact of hydrogen addition on the premixed combustion mode of producer gas (PG) fuel in a cyclonic flow combustion chamber. The results, validated against measured wall temperature data, demonstrate a minor discrepancy between simulation and experiment. The studied result showed that injection of hydrogen into PG fuel combustion elevates the temperature of the combustion process, which can be indicated by the average temperature across the combustion chamber, outlet temperature of exhaust gas, and reactive radical species. However, increasing H2 injection over 20% results in strongly increasing CO formations. Compared to a fixed thermal input case, hydrogen injection with a variable input power resulted in a higher combustion temperature and increased emissions of both CO and NO. The maximum CO emission reached approximately 1246 ppm, while NO peaked at around 75 ppm, both observed at a 30% hydrogen injection rate. The key finding of this study revealed that direct injection of hydrogen to the combustion under the condition of a given equivalence ratio is unfavorable due to insufficient oxygen for the reaction, leading to an increase in CO emissions. The optimal condition would be a hydrogen injection below 20%, which produces low CO and NO emissions.

Sustainable approaches in concrete production: An in-depth review of waste foundry sand utilization and environmental considerations.

This review critically evaluates the potential of Waste Foundry Sand (WFS) as a substitute for fine aggregate in concrete, conducting a comparative analysis of its physical and chemical properties against those of natural sand. The study synthesizes findings from various research experiments to determine concrete's most effective WFS replacement percentage. It compiles and analyzes data on how different WFS ratios affect concrete's mechanical properties, including modulus of elasticity and compressive strength. The review also consolidates research on the impact of WFS on concrete's workability, density, and flowability. A key finding is that WFS, categorized as a non-hazardous waste, possesses a diverse particle size distribution, rendering it suitable for recycling in various industrial applications.The study identifies that a 20%-30% replacement of WFS in concrete significantly improves properties such as voids, specific gravity, and density. However, it is essential to note that exceeding a 30% WFS replacement can result in increased carbonation depth and decreased resistance, primarily due to sulfur trioxide (SO3). Further observations indicate that incorporating higher levels of WFS in self-compacting concrete reduces its flowability and increases water permeability. Moreover, the review highlights the regulatory and classification challenges associated with using WFS, particularly its classification as waste, which hampers its widespread adoption in construction. In conclusion, the study recommends implementing End-of-Waste (EoW) regulations to facilitate sustainable recycling and environmental protection. Additionally, it includes a bibliometric analysis of foundry sand research spanning from 1971 to 2020, providing a comprehensive summary of the field's historical and recent developments.

INTEGRATING RENEWABLE ENERGY SOLUTIONS IN THE MANUFACTURING INDUSTRY: CHALLENGES AND OPPORTUNITIES: A REVIEW

Integrating renewable energy solutions into the manufacturing industry presents a critical pathway towards achieving sustainability and reducing carbon footprints. This review paper aims to explore the challenges and opportunities associated with the adoption of renewable energy technologies in manufacturing settings. Through a comprehensive analysis of existing literature and case studies, the paper identifies key barriers to integration, including high initial costs, technological limitations, and the need for skilled workforce. Additionally, it examines the role of policy frameworks, financial incentives, and technological advancements in facilitating the transition towards renewable energy. The methodology involves a systematic review of peer-reviewed articles, industry reports, and governmental policies related to renewable energy adoption in the manufacturing sector. The paper highlights the importance of strategic planning, investment in research and development, and collaboration between stakeholders as essential components for successful integration. Key findings suggest that while challenges remain significant, the opportunities for cost savings, improved energy efficiency, and enhanced corporate reputation make a compelling case for the shift towards renewable energy. The paper concludes that with supportive policies, continuous technological innovation, and stakeholder engagement, the manufacturing industry can overcome existing hurdles and significantly contribute to global sustainability goals. The review calls for further research into scalable and sector-specific renewable energy solutions to facilitate wider adoption across the manufacturing industry.
 Keywords: Renewable Energy, Technological Innovation, Policy and Regulatory Support, Financial Mechanisms, Capacity Building, Infrastructure Development, Market Development.

Challenges and promising practices in background check systems for firearm purchases

AbstractAimThe U.S. prohibits firearm purchase among individuals with specific risk factors. These prohibitions are operationalized using background checks for firearm purchase. Despite these restrictions, prohibited persons have obtained firearms after passing background checks, sometimes with devastating effects.Materials and MethodsWe conducted a mixed‐methods, descriptive study of the records and record‐keeping practices that underpin background checks for firearm transfers. Sources included key informant interviews with individuals working in a leadership capacity with state record‐keeping systems as well as data from state surveys and administrative records. We analyzed quantitative data using descriptive statistics and qualitative data using a thematic analysis approach to code the data and identify themes. Three investigators coded each interview. We returned to all data sources to develop key findings in an iterative process.ResultsKey informants described major improvements in the collection of specific record types that were previously a “black hole” (e.g. criminal history records housed in military justice systems, and records relating to involuntary commitments for mental illness) and advances in the automation of record transfer across agencies, themes corroborated by administrative data. Key informants also identified potential causes and solutions for challenges relating to missing or incomplete information and delays in resolving ambiguous background check results. Examples include manual processes for confirming relationship status in misdemeanor crimes of domestic violence and discordant practices for processing arrest and court records that result in dispositions that cannot be entered or arrests with no disposition.ConclusionBackground checks are the backbone of many policies designed to prevent firearm harm in the United States. This study highlights actionable ways in which states could make background check practices and policies more robust.

Indicators of Potential Use of Electric Vehicles in Urban Areas: A Real-Life Survey-Based Study in Hail, Saudi Arabia

This study aimed to uncover the attitudes, preferences, and perceptions of Hail residents toward electric vehicles (EVs) by employing a real-life survey-based approach. This paper presents an in-depth analysis of the potential adoption and impact of EVs to clarify the picture of the transition from using traditional vehicles to using EVs in Hail City, Saudi Arabia. Hail is rapidly becoming a more urbanized city; in the past few decades, the city’s area has expanded from 3242 to 17,526 hectares, and its population has increased dramatically from 82,900 in 1984 to 344,111 in present day. As a result, the city is facing increasingly difficult challenges related to rising vehicle emissions and environmental degradation. A survey was conducted among a diverse group of 346 participants. The survey results show an average of 3.15 cars per family, which indicates a strong connection with personal vehicles. The survey provides a comprehensive picture of the respondents’ socioeconomic background, indicating an average household size of 5.8 people and an average monthly income of SR 13,350. The key findings from the survey reveal that approximately 52.3% of the respondents have 3–4 family members, and nearly half of the families own one or two cars. Government employees formed a major proportion of the respondents. The results show a significant inclination toward EVs, with 78.6% of the participants being aware of EV charging stations and 37.9% expressing a positive attitude towards switching to electric vehicles. Despite this, a large majority (88.7%) have never driven an electric car. The respondents’ driving habits are further explored in the survey, which reveals an average of 2.1 h of daily driving. Furthermore, the respondents disclosed an average weekly fuel expenditure of SR 235. The results also highlight that the average weekly cost for fuel varies among the respondents, with most respondents spending no more than SR 300 per week. Additionally, this study examined the daily vehicle mileage, revealing that 37.9% of the respondents have a daily mileage of 51 to 100 km, which impacts the planning of charging station capacities and locations. The findings suggest a growing interest in EVs and highlight the need for strategic infrastructure development to support the anticipated surge in EV adoption.

Analysing preference heterogeneity and willingness to pay for nature-based tourism activities in Gran Canaria for young Germans

ABSTRACT This paper examines the heterogeneity in preferences and willingness to pay for various nature-based tourism activities that can be carried out in natural areas on Gran Canaria Island (Spain). A discrete choice experiment is designed to obtain information about potential visitors’ preferences in a set of hypothetical scenarios involving various activity packages created by combining the levels of the attributes according to an efficient design. Collected information is used to estimate a Mixed Logit model which will allow us to evaluate random and systematic heterogeneity in preferences. A key finding of the research emanates from obtaining individual-specific parameters to calculate not only the willingness to pay for the various activities but also the amount that could guide a potential compensation when undesired activities are included in the package. Results provide interesting managerial tools that can be used by tourism entrepreneurs to promote nature-based tourism products in the area.

Crossing Boundaries: The Ethics of AI and Geographic Information Technologies

Over the past two decades, there has been increasing research on the use of artificial intelligence (AI) and geographic information technologies for monitoring and mapping varying phenomena on the Earth’s surface. At the same time, there has been growing attention given to the ethical challenges that these technologies present (both individually and collectively in fields such as critical cartography, ethics of AI and GeoAI). This attention has produced a growing number of critical commentaries and articles as well as guidelines (by academic, governmental, and private institutions) that have been drafted to raise these ethical challenges and suggest potential solutions. This paper presents a review of 16 ethical guidelines of AI and 8 guidelines of geographic information technologies, analysing how these guidelines define and employ a number of ethical values and principles (e.g., autonomy, bias, privacy, and consent)One of the key findings from this review is the asymmetrical mentioning of certain values and principles within the guidelines. The AI guidelines make very clear the potential of AI to negatively impact social and environmental justice, autonomy, fairness and dignity, while far less attention is given to these impacts in the geographic information guidelines. This points to a need for the geo-information guidelines to be more attentive to the role geographic information can play in disempowering individuals and groups.

Coronary computed tomography angiography for clinical practice.

Coronary artery disease (CAD) is a common condition caused by the accumulation of atherosclerotic plaques. It can be classified into stable CAD or acute coronary syndrome. Coronary computed tomography angiography (CCTA) has a high negative predictive value and is used as the first examination for diagnosing stable CAD, particularly in patients at intermediate-to-high risk. CCTA is also adopted for diagnosing acute coronary syndrome, particularly in patients at low-to-intermediate risk. Myocardial ischemia does not always co-exist with coronary artery stenosis, and the positive predictive value of CCTA for myocardial ischemia is limited. However, CCTA has overcome this limitation with recent technological advancements such as CT perfusion and CT-fractional flow reserve. In addition, CCTA can be used to assess coronary artery plaques. Thus, the indications for CCTA have expanded, leading to an increased demand for radiologists. The CAD reporting and data system (CAD-RADS) 2.0 was recently proposed for standardizing CCTA reporting. This RADS evaluates and categorizes patients based on coronary artery stenosis and the overall amount of coronary artery plaque and links this to patient management. In this review, we aimed to review the major trials and guidelines for CCTA to understand its clinical role. Furthermore, we aimed to introduce the CAD-RADS 2.0 including the assessment of coronary artery stenosis, plaque, and other key findings, and highlight the steps for CCTA reporting. Finally, we aimed to present recent research trends including the perivascular fat attenuation index, artificial intelligence, and the advancements in CT technology.

Overview of the population genetics and connectivity of sea turtles in the East Asia Region and their conservation implications

Understanding the current status and recent development of the population genetics and connectivity of sea turtles is crucial for effective conservation management of the species. Five sea turtle species, green turtle (Chelonia mydas), loggerhead turtle (Caretta caretta), hawksbill turtle (Eretmochelys imbricata), olive ridley turtle (Lepidochelys olivacea) and leatherback turtle (Dermochelys coriacea), are recorded in the East Asia Region situated in the western side of the North Pacific Ocean. We compiled information from 35 published genetic studies on the five sea turtle species, with a focus on green turtle and loggerhead turtle, which are the most studied species (in 30 studies) in view of their commonness and occurrence of nesting populations. We provided an overview of the key methods and findings of these previous studies, addressing two main objectives on genetic structure of the rookeries and their differences compared to other populations, and connectivity of the rookeries and foraging aggregations. By identifying information gaps and conservation needs, we discussed future developments for sea turtle genetic studies and conservation implications in the region.

Assessing Future Hydrological Variability in a Semi-Arid Mediterranean Basin: Soil and Water Assessment Tool Model Projections under Shared Socioeconomic Pathways Climate Scenarios

Climate is one of the main drivers of hydrological processes, and climate change has caused worldwide effects such as water scarcity, frequent floods and intense droughts. The purpose of this study was to analyze the effects of climate change on the water balance components, high flow and low flow stream conditions in a semi-arid basin in Iran. For this reason, the climate outputs of the CanESM5 model under Shared Socioeconomic Pathways (SSP) scenarios SSP126, SSP245, and SSP585 were spatially downscaled by the Statistical Downscaling Model (SDSM). The hydrological process was simulated by the Soil and Water Assessment Tool (SWAT) model. Key findings include a 74% increase in evapotranspiration, a reduction by up to 9.6% in surface runoff, and variations in discharge by up to 53.6%. The temporal analysis of snow melting changes revealed an increase in the volume of snow melting during winter months and a reduction in the volume during spring. The projected climate change is expected to cause notable variations in high and low flow events, particularly under the SSP585 scenario, which anticipates significant peaks in flow rates. This comprehensive analysis underscores the pressing need for adaptive strategies in water resource management to mitigate the anticipated impacts of climate variability.

Cryogenic electron tomography reveals novel structures in the apical complex of Plasmodium falciparum.

Malaria is an infectious disease caused by parasites of the genus Plasmodium and is a leading cause of morbidity and mortality globally. Upon infection, Plasmodium parasites invade and replicate in red blood cells, where they are largely protected from the immune system. To enter host cells, the parasites employ a specialized apparatus at their anterior end. In this study, advanced imaging techniques like cryogenic electron tomography (cryo-ET) and Volta Phase Plate enable unprecedented visualization of whole Plasmodium falciparum merozoites, revealing previously unknown structural details of their invasion machinery. Key findings include new insights into the structural conservation of apical rings shared between Plasmodium and its apicomplexan cousin, Toxoplasma. These discoveries shed light on the essential and conserved elements of the invasion machinery used by these pathogens. Moreover, the research provides a foundation for understanding the molecular mechanisms underlying parasite-host interactions, potentially informing strategies for combating diseases caused by apicomplexan parasites.

How Do Men Evaluate and Blame Victims of Mobbing? Depending on the Victims' Identification as Feminist or Egalitarian.

In the current research, our objective was to explore how men assess and assign blame to both a man and a woman who are victims of workplace mobbing, depending on whether they identify as feminist or egalitarian. It is well recognized that the label "feminist" carries distinct connotations when applied to individuals of different genders. However, it remains unclear whether these varied connotations are due to the label itself or its underlying meaning. Given that the feminist label has been traditionally stigmatized, we aimed to disentangle the influence of the label from its semantic content. To achieve this, we compared the evaluations and attributions of victim blame directed toward targets labeled as feminist with those labeled with a similar but more neutral term-that is, egalitarian-as well as with unlabeled targets. Considering that much of the previous research in this area has focused on samples predominantly composed of women, we aimed to investigate how men respond to these labels. Through three experiments involving male participants (N = 628), we presented fictitious scenarios depicting a man or a woman who were victims of workplace mobbing due to their identification as feminist or egalitarian. The key finding of our research is that the feminist label, rather than its semantic content, significantly influences the evaluations and assignment of blame expressed by men who strongly adhere to traditional male role norms. These findings underscore the importance of these labels (feminist and egalitarian) in social judgments, particularly when applied to victims of workplace mobbing.

Analyzing Obstacles to Poetry Comprehension among Persian Language and Literature Students at Dari Department of Jawzjan University

This research delves into the intricacies of poetry dictation challenges faced by students, with a specific focus on the Dari Persian Language and Literature Department at Jawzjan University. Notably, existing studies have predominantly addressed issues arising from incorrect poetry reading, yet a gap exists in understanding the unique problems within this academic environment. The primary objective is to identify and remediate factors impeding accurate and fluent poetry dictation among students. Employing a quantitative approach and Cochran's formula, the study involved 108 randomly selected students from the first, fourth, and fifth semesters in the Dari language and literature department at Jawzjan University, Afghanistan. The research, facilitated through a survey questionnaire developed by the author, employs descriptive statistics in SPSS for data analysis. Key findings reveal critical challenges, including subpar teaching quality of the Persian language in schools (mean score of 2.59), elevated stress and anxiety levels during poetry dictation (mean score of 2.54), inadequate mastery of vocabulary (mean score of 2.48), and a dearth of practice among students (mean score of 2.39). The significance of these findings lies in their potential to substantially enhance poetry dictation skills, providing valuable insights for both educators and students, and addressing the unique challenges within the academic context of Jawzjan University

Decadal (2010–2019) variability in the marine ecosystems of the North Atlantic

Abstract The “Symposium on Decadal Variability of the North Atlantic and its Marine Ecosystems: 2010–2019” took place in Bergen, Norway, from 20 to 22 May 2022. This event, hosted by the Institute of Marine Research, was jointly sponsored by ICES and NAFO and constitutes the fourth in a series of these symposia that started in 1991. The first symposium’s aim was to review the hydrobiological variability in the decade of the 1980s, addressing the physical environment, plankton, invertebrates, and fish. Subsequent symposia maintained the classical structure, whilst a new theme session covering social sciences was added to the programme in the 2022 edition. Studies of climate impacts on marine ecosystems and living marine resources, including trends and regime shifts, emerged from increasingly longer ecosystem time series across the North Atlantic and subarctic regions. This symposium collection presents key findings discussed during the symposium. Whilst some progress has been made in advancing our ability to understand new trends and patterns of climate change and variability across physical, plankton, and fish communities, more work is needed to integrate these physical-ecological processes and scales with social science.

Disability Research in Zambia: A Scoping Review

Background: Globally, people with disabilities experience exclusion from health, education, employment, and other aspects of daily life. Evidence on lived experience across key life areas (such as education, health, and employment) is necessary to promote disability-inclusive policy and practice, but there is often limited evidence from sub-Saharan Africa and there is no current synthesis in Zambia. Objectives: This scoping review aimed to synthesise evidence relevant to the lived experience of people with disabilities in Zambia across key life areas, in order to support national disability policy and practice. Method: MEDLINE, Embase, Web of Science, CINAHL, PsycInfo, Global Health, Africa-Wide Information and grey literature sources were searched from database inception until June 2023, although after the database search, we included only articles published from 2007, after adoption of the United Nations Convention on the Rights of Persons with Disabilities. Articles of any study design that were relevant to disability in Zambia were included, although prevalence studies were excluded to keep the focus on lived experience. Search results were independently screened by two reviewers, first by title/abstract, then by full text. Study characteristics and key findings were extracted, with findings narratively synthesised across key topic areas, such as health, education, and family support. Results: From 10,327 search results, 122 articles were included. Over a third of included articles focused on education for children with disabilities (n = 41, 34%) and the majority were conducted in Lusaka Province (n = 73, 60%). The included research demonstrated a number of challenges experienced by people with disabilities in Zambia that impinge on their human rights, including inaccessible environments, stigma and discrimination, and limited support. Evidence is relatively limited in some key areas, including healthcare and employment, and there is need for up-to-date research. Conclusions: People with disabilities in Zambia experience daily challenges. There is need for action to improve disability inclusion in Zambia in line with the United Nations Convention on the Rights of Persons with Disabilities.

Three-State Diffusion Model of DNA Glycosylase Translocation along Stretched DNA as Revealed by Free Energy Landscapes at the All-Atom Level.

DNA glycosylases play key roles in the maintenance of genomic integrity. These enzymes effectively find rare damaged sites in DNA and participate in subsequent base excision repair. Single-molecule and ensemble experiments have revealed key aspects of this damage-site searching mechanism and the involvement of facilitated diffusion. In this study, we describe free energy landscapes of enzyme translocation along nonspecific DNA obtained using a fully atomistic molecular dynamics (MD) simulation of a well-known DNA glycosylase, human 8-oxoguanine DNA glycosylase 1 (hOGG1). Based on an analysis of simulated free energy profiles, we propose a three-state model for the damage-site searching mechanism. In the three states, named the L1, L2, and L3 states, the L1 state is a helical sliding mode in close contact with DNA, whereas the L2 state is a major- or minor-groove tracking mode in loose contact with DNA and the L3 state is a two-dimensional freely diffusing mode during which hOGG1 is somewhat removed from the DNA surface (∼24 Å away from the surface). This three-state model well describes key experimental findings obtained from single-molecule and ensemble experiments and provides a unified molecular picture of the DNA lesion-searching mechanism of hOGG1.

Comparative Study of Air–Water and Air–Oil Frictional Pressure Drops in Horizontal Pipe Flow

Experimental data for frictional pressure drop using both air–water and air–oil mixtures are reported, compared and used to evaluate predictive methods. The data were gathered using the 2-inch (54.8 mm) flow loop of the multiphase flow facility at the National University of Singapore. Experiments were carried out over a wide range of flow conditions of superficial liquid and gas velocities that were varied from 0.05 to 1.5 m/s and 2 to 23 m/s, respectively. Pressure drops were measured using pressure transducers and a differential pressure (DP) cell. A hitherto unreported finding was achieved, as the pressure drop in air–oil flow can be lower than that in air–water flow for the higher range of flow conditions. Using flow visualization to explain this phenomenon, it was found that it is related to the higher liquid holdup that occurs in the case of air–oil around the annular flow transition and the resulting interfacial friction. This additional key finding can have applications in flow assurance to improve the efficiency of oil and gas transportation in pipelines. Models and correlations from the open literature were tested against the present data.