Bradford Scholars: Recent submissions
Now showing items 41-60 of 11125
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Stochastic Expansion planning Model for a coordinated Natural gas and Electricity Networks Coupled with Gas-fired Generators, Power-to-Gas Facilities and Renewable PowerThis paper presents a stochastic expansion planning model for coordinated natural gas and electricity networks, incorporating gas-fired generators, Power-to-Gas facilities, and renewable power sources. The primary objective is to minimize the total cost over the planning horizon, addressing the significant interdependencies between these networks which, if planned independently, can lead to higher overall costs. The originality of this work lies in its comprehensive integration of both systems, leveraging their synergies to optimize infrastructure investment and operational efficiency. Methodologically, the model employs mixed integer linear programming (MILP) within the General Algebraic Modelling System (GAMS), using a Scenario Tree concept to account for the stochastic nature of renewable energy sources (RESs) and load variations. Data from an adapted twenty-node Belgium gas network and a sixteen-bus UK electricity distribution system were utilized. Results demonstrate substantial cost savings and improved system performance with the integrated approach, validating the model's effectiveness.
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Interaction of Acinetobacter sp. RIT 592 induces the production of broad-spectrum antibiotics in Exiguobacterium sp. RIT 594Antimicrobial resistance (AMR) is one of the most alarming global public health challenges of the 21st century. Over 3 million antimicrobial-resistant infections occur in the United States annually, with nearly 50,000 cases being fatal. Innovations in drug discovery methods and platforms are crucial to identify novel antibiotics to combat AMR. We present the isolation and characterization of potentially novel antibiotic lead compounds produced by the cross-feeding of two rhizosphere bacteria, Acinetobacter sp. RIT 592 and Exiguobacterium sp. RIT 594. We used solid-phase extraction (SPE) followed by liquid chromatography (LC) to enrich antibiotic extracts and subsequently mass spectrometry (MS) analysis of collected fractions for compound structure identification and characterization. The MS data were processed through the Global Natural Product Social Molecular Networking (GNPS) database. The supernatant from RIT 592 induced RIT 594 to produce a cocktail of antimicrobial compounds active against Gram-positive and negative bacteria. The GNPS analysis indicated compounds with known antimicrobial activity in the bioactive samples, including oligopeptides and their derivatives. This work emphasizes the utility of microbial community-based platforms to discover novel clinically relevant secondary metabolites. Future work includes further structural characterization and antibiotic activity evaluation of the individual compounds against pathogenic multidrug-resistant (MDR) bacteria.
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Preparation of flexible polymer sensor material by Spatial Confining Forced Network Assembly Micro Injection MoldingThe development of high-performance flexible pressure-sensing materials necessitates the simultaneous achievement of exceptional flexibility, conductivity, and alignment of micro-nano structures with the mechanical response characteristics inherent to these materials. In this study, we propose a novel method for preparing flexible microneedles as a pressure-sensitive sensor array. Firstly, we obtain conductive composite particles through extrusion granulation, which consists of a compact conductive network with micron-scale filler as the skeleton and nano-filler filling in the gaps within the network. Moreover, by utilizing the ‘volume exclusion’ effect of the microneedle array on the micron-scale filler during injection molding, nanofillers dominate in entering the microneedle. As a result, our molded product exhibits high flexibility and moderate conductivity in its pressure-sensitive area, thereby providing ultra-high-pressure resistance along with desired response characteristics and sensitivity for sensors. Additionally, due to synergistic effects between microscale fillers and nano-fillers in non-pressure sensitive bases, a compact conductive network is formed that imparts sufficient conductivity to sensor materials. The method yields sensors with excellent repeatability, high dimensional accuracy, and good consistency, effectively addressing core application challenges of flexible sensors. The microstructure array flexible sensor fabricated using high-precision injection molding technology offers high efficiency, low cost, and scalability for mass production. Furthermore, the sensitivity of sensors produced by this method is significantly higher—26.6% greater than those made using traditional methods—with a sensitivity as high as 4.71kPa -1 .
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Seen but not heard: Reconstructing the early life history of the Industrial child through carbon and nitrogen stable isotope analysis of dentine collagenObjective This project reconstructs the early life history of the child in industrial London using incremental dentine analysis of both adults (survivors) and children (non-survivors) within a single 19th century London burial population to investigate the effects which changing social and economic conditions during Industrialisation had on their diet, health, and quality of life. Materials & Methods Macroscopic analysis was performed on the excavated assemblage (n=514) of New Bunhill Fields burial ground, Southwark, London (1821-53) to identify those with skeletal evidence of childhood stress (LEH, rickets, residual rickets) who were suitable for isotopic analysis. Radiographic analysis of the dental pulp chamber was also performed on these individuals to identify childhood vitamin D deficiency. A total of 20 adults (20/157) and 22 non-adults (22/357) were chosen for carbon (δ13C) and nitrogen (δ15N) stable isotope analysis. Incremental dentine analysis was performed on the first permanent molar and isotopic profiles were created spanning from birth until tooth completion/death during tooth development. Results The isotopic data indicated that adult and non-adult diet was consistent with that observed in other 19th century London burial populations. Evidence for breastfeeding was widespread amongst survivors and non-survivors. Radiographic results indicated that vitamin D deficiency during early childhood was much more prevalent within the burial group than skeletal evidence suggested, and it was observed more frequently in those who survived into adulthood (80%) than in those who died during childhood (42%). Concurrent evidence of isotopic physiological stress with LEH formation was observed in some but not all individuals. A pattern of opposing co-variance was observed often in early infancy, most frequently in non-survivors, and isotopic evidence for physiological stress was also observed in the final dentine increments of some who died during tooth development. There was a tentative association observed between adult age-at-death and skeletal stress indicators in early childhood, where the average age-at-death was older in those with fewer childhood stress indicators. Conclusions & Significance This research project found that early life stress was common within this urban community and was associated with negative outcomes later in life, especially amongst those who died in childhood.
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Fixing Illicit Financial Flows between Nigeria, United Kingdom and the United Arab Emirates: Corruption’s Bermuda Triangle"Fixing Illicit Financial Flows between Nigeria, the UK, and UAE: Corruption's Bermuda Triangle" delves into one of the most pressing challenges in global finance - illicit financial flows (IFFs). This groundbreaking book examines how vast sums of Nigeria’s wealth vanish into the financial systems of the UK and UAE, depleting the country's economic resources. With a focus on real estate, banking, and professional sectors, the authors critically assess the existing laws and regulations in all three countries and explore the gaps that allow corruption and money laundering to thrive. Supported by empirical research, the book highlights the urgent need for reform in international financial practices and offers innovative solutions to curb the outflow of illicit wealth from Nigeria. A must-read for policymakers, legal scholars, and anyone interested in the intersection of law, finance, and development in Africa.
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Back to the future of ‘biopower’: Foucault’s prescriptions and the regulation of commercial order and discordance in outer spaceThis article applies Foucault’s ideas on Power –specifically biopower as a tool to explain sovereignty, jurisdiction and control over persons in outer space. This approach will hopefully illuminate the general nature and essence of ‘statist’ regulation of outer space activities. We believe that Foulcaut’s analysis of biopower -a tool of critical law scholarship can help to forensically explain the governing dynamics of the jurisdiction ratione personae exercised by states in outer space under the modern Westphalian model of sovereignty. The approach will also aid in prescribing sustainable and progressive policy directions for national regulatory agencies in space. Foucauldian approaches would help reveal both the considerable strengths and of course, the limitations and perhaps inequities of national regulation in space. This exercise will also hopefully indicate quite clearly why networks of international agencies and private corporations ought not be able to displace core aspects of statist manifestation of regulatory power in outer space. The article attempts to free jurisdiction from its semantic legalese in space law and make it encompass philosophy, sociology and jurisprudential influences while at the same time restricting the exploitative purposes to which both jurisdiction and biopower can be pressed in outer space.
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Between Life and Death: Continuing Bonds at Late Neolithic Tell Sabi Abyad, SyriaIn this paper, we pay tribute to the career-long interest of Prof Peter Akkermans in the mortuary practices of prehistoric southwest Asia. It highlights the significant discovery of burial grounds at Tell Sabi Abyad and the diverse range of mortuary behaviours observed at this key Late Neolithic site. While traditional approaches to the treatment of the dead often focus on social status, this paper proposes a fresh perspective by examining the agency of the bereaved and the impact of their emotional needs on mortuary rituals. Drawing on an extensive dataset of over 300 burials, the paper centres on a subset of burials from Tell Sabi Abyad I and III, dating back to the 7th and early 6th millennium BCE. In contrast to the typical interments, these burials reveal extended interaction with the deceased, involving bodily manipulation and close spatial proximity to the living. In this paper, we delve into new interpretations of this evidence, shedding light on the emotional relationships between the living and the dead. We explore possible motivations behind maintaining a tangible connection with the deceased and examine whether such practices offer insights into experiences of grief and bereavement – dimensions often overlooked in archaeological analysis. By incorporating emotion, sensory experiences, and mourning into the interpretation of mortuary evidence, in this paper, we aim to enrich our understanding of mortuary practices’ significance in southwest Asia’s prehistoric context.
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Shear behavior of FRP-UHPC composite beams enhanced by FRP shear key: Experimental study and theoretical analysisTo investigate the shear behavior of FRP (fiber reinforced polymers)-UHPC (ultra-high performance concrete) composite beams, four-point bending tests were conducted on seven FRP-UHPC specimens and two FRP-NSC (normal strength concrete) specimens, having different width and depth of concrete flange as well as FRP shear key (FSK) spacing. The slip between FRP profiles and concrete flange was controlled by employing FSK and epoxy resin bonded hybrid connection. The failure pattern, load-deflection/strain curves, and sliding response of composite beams were analyzed to study the influence of concrete type, FSK spacing, width and thickness of concrete slab. The results indicate that FRP-UHPC composite beams exhibited shear failure, while FRP-NSC composite beams experienced bending-shear failure. The composite beams demonstrated shear-lag effect, which became more pronounced with the increasing of the concrete slab width. The use of UHPC, reducing FSK spacing, and increasing the size of cross-section of concrete flange can effectively enhance the shear performance and reduce interface sliding. Formulae were developed to predict the shear capacity and deflection, considering shear deformation. The results predicted by the formulae developed match well with the experimental results.
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Shear performance of poplar LVL beams with a hole in bending-shear spansTo investigate the shear performance of poplar laminated veneer lumber (LVL) beams with holes in bending-shear spans, six specimens were designed and tested by four-point bending tests. Among these, five specimens were provided with a single hole of varying diameter-to-height ratio in the bending-shear span and two of these beams were also reinforced with circumferential carbon fiber reinforced polymer (CFRP) wrap layers. Furthermore, a 3D finite element models for poplar LVL beams with a hole were established, based on the extended finite element method (XFEM) using ABAQUS software. The validated model was utilized to conduct parametric studies on the diameter-to-height ratio, the hole shape, and the vertical eccentricity ratio. A simplified theoretical analysis for predicting the cracking and ultimate loads for LVL beam with a hole was also proposed. The results indicated that beams without a hole failed due to bending, characterized by mid-span tension cracks, whereas beams with a hole exhibited shear failure along the beam's grain direction due to stress concentration around the holes. The maximum normal tensile strain perpendicular to grain around the hole had an angle of 45° or 225° relative to the beam's longitudinal axis, consistent with the crack initiation angle. As the diameter-to-height ratio increased, the cracking and ultimate loads of beams with a hole decreased, indicating more brittle failure characteristics. The circular hole beam showed significant improvements in cracking and ultimate loads compared with the square hole beam with side length equal to the diameter of the circular hole. When the hole center's vertical eccentricity was in the compression zone, an increase in vertical eccentricity led to enhancements in both the cracking load and ultimate loads. Wrapping the beam with CFRP sheet around the hole effectively mitigated crack propagation, enhancing the load-bearing capacity of beams. The simplified formulas provided accurate prediction for the ultimate load, but highly overestimated the cracking and ultimate loads for poplar LVL beams with a hole. The research findings can be provided as a technical support for the design and application of LVL beams with holes.
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A review on the potential application of ultra-high performance concrete in offshore wind towers: Insights into material properties, mechanisms, and modelsUltra-high performance concrete (UHPC), characterized by its high strength and toughness as well as durability, provides a promising solution for the construction of offshore wind towers (OWTs). This paper comprehensively reviews the durability and the dynamic mechanical properties of UHPC for OWTs under the impacts of the marine environment. Furthermore, the modifying effects of additives, including supplementary cementitious materials (SCMs) and reinforcing fibers, as well as nanofillers on UHPC are explored. Overall, UHPC possesses a dense microstructure that impedes the intrusion of harmful substances, and owing to the incorporation of additives, UHPC exhibits outstanding dynamic mechanical properties, making it an ideal material for applications in OWTs subjected to vibration fatigue and dynamic impact loads. Incorporating SCMs into UHPC can improve the durability and environmental benefits while maintaining similar dynamic mechanical properties concurrently. Nanofillers can serve as a beneficial supplement to steel fibers providing improved durability and dynamic mechanical properties by endowing UHPC dense microstructure and high system energy. Various models of marine environmental and loading actions on UHPC, examining ion transport, matrix degradation, and constitutive models, are concluded to gain insight into the underlying destructive mechanisms. These underlying mechanisms and the theoretical models further deepen the understanding of the service performance of UHPC in marine environments, thus providing the design guidance for the potential applications of UHPC in OWTs.
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Geophysical investigations within the Latus Dextrum of Porolissum Fort, Northwestern Romania - The layout of a Roman edificeThis paper summarizes the results of a recent geophysical investigation carried out at Porolissum, which is considered to be one of the most significant Roman sites in Romania. The geophysical survey was carried out within the latus dextrum of the fort, which is the same location that had been the subject of earlier geophysical surveys as well as older archaeological excavations (1970s) that had uncovered a multiroom building. A cesium vapor total field magnetometer and a multi-electrode resistivity meter for a dense Electrical Resistivity Tomography (ERT) survey were used. Eighty parallel ERT profiles in combination with the emerging total field magnetic data and an antecedent magnetic survey allowed us to complete a more precise interpretation regarding the building that once existed on the left side of Porolissum’s Principia (the commander’s house). In contrast to the magnetic survey, which only reveals a part of the building’s architecture, the ERT survey provides a comprehensive view of the structure’s layout. More than 20 rooms could be positively identified, and the existence of further rooms might be deduced from the data. The ERT scan revealed the existence of the building’s northern external wall as well, which is not reflected on the magnetic map. Because some parts of the building are not visible on the magnetic map, we can assume that the building was constructed with at least two types of rocks (magmatic and sedimentary). In addition to the archaeological interpretation of the geophysical anomalies, a number of discussions concerning the connection between our survey and the geology of the area were held. The complementarity of the magnetic and resistivity results prompted us to conceive a preliminary 3D reconstruction of the building. Even if the building function is unknown in the absence of reliable archaeological data, it could have been a storage building, a second praetorium, a valetudinarium (hospital), or an armamentarium (weapons storage building). The illustrative reconstruction was completed taking into consideration that the building was a Roman military hospital, which, based on the available data, may be considered a credible assumption.
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Introduction of Metaverse in businessIt has become obvious to companies that the metaverse may help maximize profits. The purpose of this chapter is to describe the uses and possibilities of metaverse-based virtual and augmented reality technologies in the future. Brands can now engage with customers at a completely new level of interaction through Metaverse, which cannot be achieved within current marketing channels. Immersive XR environments may require decision makers to reexamine customer journeys, demographic characteristics, and customer personas. The main purpose of this chapter is to present an overview of metaverse applications. Further this section reveals the ways in which the business and education industry can benefit through metaverse applications. Additionally, this section reveals the real-world applications of technology in metaverse for avatar, gaming, and prospects. Finally, this chapter sheds light on the academics and practitioners by showing how metaverse elements can contribute for business processes.
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Biodegradable Polymer Composites of Metal Organic Framework-5 (MOF-5) for the Efficient and Sustained Delivery of Cephalexin and MetronidazoleThe sustained and controlled delivery of antimicrobial drugs has been largely studied using nanomaterials, like metal organic frameworks (MOFs), and various polymers. However, not much attention has been given to combining MOFs and biodegradable polymers towards the potentially more sustained release of active pharmaceutical ingredients. Herein, we report a comparative study of two widely used antimicrobial drugs, cephalexin and metronidazole, from zinc-based MOF-5 incorporated into biodegradable polycaprolactone (PCL) and poly-lactic glycolic acid (PLGA) composites. Cephalexin and metronidazole were separately loaded into MOF-5 post-synthetically, followed by their integration into biodegradable PLGA and PCL composites. The pristine MOF-5 and the loaded MOFs were thoroughly characterised using Fourier-transformed infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and powder X-ray diffraction (PXRD). Ultraviolet-visible (UV-Vis) spectroscopy studies were carried out to assess the release of the drugs in PBS for up to 72 h, showing a cumulative release of 24.95 wt% and 27.84 wt% for cephalexin and metronidazole, respectively. The antibacterial properties of the pristine MOF, pure drugs, drug-loaded MOFs and the loaded composites were assessed against Gram-positive and Gram-negative bacterial strains, Staphylococcus aureus or Staphylococcus epidermidis and Escherichia coli or Acinetobacter baumanii, respectively. A cephalexin-loaded MOF-5 composite of PCL (PCL-ceph@MOF-5) showed the best efficiency for the controlled release of drugs to inhibit the growth of the bacteria compared to the other composites. This study demonstrates that the combination of MOFs with biodegradable polymers can provide an efficient platform for the sustained release of antimicrobial drugs and can be a promising tool to manage antimicrobial resistance (AMR).
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Controlled delivery of ciprofloxacin using zirconium-based MOFs and poly-caprolactone compositesWith antimicrobial resistance (AMR) increasing at an alarming rate, there is a need to develop better antibiotic delivery platforms at the point of need, to reduce over-exposure to antibiotics that are delivered systemically. Recent studies have suggested the use of metal-organic frameworks (MOFs) as potential vehicles for controlled and efficient delivery of various active pharmaceutical ingredients (APIs). Development of MOF-polymer composite materials can assist in the development of medical devices that can deliver APIs to local sites in a targeted approach. This study reports the encapsulation of a widely used antibiotic - ciprofloxacin (CIP) - into two Zr-based MOFs (UiO-66 and UiO-66-NH2) and their subsequent integration into a biodegradable polymer; polycaprolactone (PCL), via solvent casting, to obtain a PCL-MOF composite membrane. The MOFs and PCL-MOF composites were characterised by Fourier-transformed infrared (FT-IR) spectroscopy, powder X-ray diffraction (PXRD), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). The results demonstrated that the structural integrity of the pristine MOFs was maintained after drug loading and incorporation into the PCL membranes. The ciprofloxacin release was studied using ultraviolet–visible (UV–Vis) spectroscopy, and the results showed that the PCL-MOF composites had a more controlled drug release profile compared to the MOF alone, when monitored for seven days in phosphate buffered saline (PBS) and accelerated ageing (AA) release media. In addition, release studies showed pH-dependence with faster release of ciprofloxacin at both acidic and basic conditions. Antimicrobial assay showed excellent efficacy for both CIP-loaded MOFs and their PCL composites against S. aureus and E. coli, a Gram-negative and Gram-positive bacterium, respectively, with inhibition zone as high as >50 mm against E. coli for UiO-66-NH2-CIP, indicating their potential applications in purpose-specific medical devices.
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Educators’ Perspectives on University Technology Transfer Processes in the Philippines: A Case StudyAs universities extend the scope of their tasks as educational institutions to include technology transfer and commercialization of their faculty’s and students’ research outputs, it becomes necessary to investigate internal systems that facilitate such processes. Existing literature on technology transfer in the Philippines is mostly focused on the transfer of a specific technology, industry–academe research and development (R&D) collaboration, the experience in a specific industry, or the experience in public Philippine higher education institutions (HEIs). The perspectives of educators and researchers who are the recipients of technology transfer services within Philippine HEIs have, so far, not yet been investigated. This paper aims to fill that gap by interviewing eight educators from four colleges in a Philippine HEI. The findings primarily reveal the importance of internal communications in the university technology transfer process. They also reveal that, aside from entrepreneurship training, educators need to understand the intellectual property rights system to see the potential benefits of intellectual property protection and be able to relate intellectual property rights to their research work. This paper therefore recommends that, to promote intellectual property awareness and academic entrepreneurship in the country, HEIs need to allocate resources for intellectual property education and entrepreneurship training to encourage active participation of researchers in Philippine HEIs in the formal technology transfer process.
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Clinician measurement of spectacle prescription changes and patient tolerance to themPurpose. To investigate the subjective refraction techniques of UK optometrists and their influence on patient-reported problems with new spectacles. Methods. First, an investigation from optical practices’ perspective, with a study investigating the frequency and causes of patient complaints. Three questionnaires follow; i) quantification of patient-reported symptoms with new spectacles, ii) the methods of refraction used by clinicians and iii) part-refracting as a special case of part-prescribing. Finally, the typical cylinder changes prescribed in patients’ refractive history are examined. Results. 2.3% of eye examinations resulted in rechecks. Cylinders were implicated in 38% of causes, of which 42% were oblique. 83% of rechecks were due to inaccurate measurement of prescription; presenting symptoms, prescription changes and improvements in visual acuity (VA) were often not reconciled and 93% reported not measuring VA to full threshold. The change in ocular astigmatism from with- to against-the-rule with age was more than three times more likely to pass through oblique axes than a spherical prescription. 36% of eyes were found to have an oblique cylinder prescribed at least once and of these, 78% were transitory in nature. Conclusions. Subjective refraction, visual acuity measurement, analysis of refractive change and prescribing techniques were often poor and cylinder changes, particularly oblique, were identified as a cause of increasing rechecks with patient age. These are fundamental aspects of optometry, yet need to be more prominent in continuing professional development.
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Intersectional marginality: Compounding structural violence against Dalit Christians in IndiaThe limited literature on anti-Christian violence in India focuses on physical forms of violence. This chapter instead shows how the experience of structural violence faced by Dalit Christians is compounded due to the intersecting marginalities of religion and caste. Particularly, this chapter focuses on the structural violence experienced from the state, in the form of the imposition of anti-conversion laws, and the denial of state resources to Dalit Christians such as affirmative action policies. This chapter argues that as the Hindutva ideology has become further embedded in India’s political-legal structure, the situation of structural violence has deepened and compounded.
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Natural language processing-driven framework for the early detection of language and cognitive declineNatural Language Processing (NLP) technology has the potential to provide a non-invasive, cost-effective method using a timely intervention for detecting early-stage language and cognitive decline in individuals concerned about their memory. The proposed pre-screening language and cognition assessment model (PST-LCAM) is based on the functional linguistic model Role and Reference Grammar (RRG) to analyse and represent the structure and meaning of utterances, via a set of language production and cognition parameters. The model is trained on a DementiaBank dataset with markers of cognitive decline aligned to the global deterioration scale (GDS). A hybrid approach of qualitative linguistic analysis and assessment is applied, which includes the mapping of participants´ tasks of speech utterances and words to RRG phenomena. It uses a metric-based scoring with resulting quantitative scores and qualitative indicators as pre-screening results. This model is to be deployed in a user-centred conversational assessment platform.