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Prediction of multi-inputs bubble column reactor using a novel hybrid model of computational fluid dynamics and machine learning

The combination of machine learning and numerical methods has recently become popular in the prediction of macroscopic and microscopic hydrodynamics parameters of bubble column reactors. Such numerical combination can develop a smart multiphase bubble column reactor with the ability of low-cost computational time when considering the big data. However, the accuracy of such models should be improved by optimizing the data parameters. This paper uses an adaptivenetwork-based fuzzy inference system (ANFIS) to train four big data inputs with a novel integration of computational fluid dynamics (CFD) model of gas. The results show that the increasing number of input variables improves the intelligence of the ANFIS method up to R = 0.99, and the number of rules during the learning process has a significant effect on the accuracy of this type of modeling. Furthermore, the proper selection of model’s parameters results in higher accuracy in the prediction of the flow characteristics in the column structure.

Type: Journal Article/Review
Status: Live|Last updated:May 20, 2019 11:34 AM
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Defining the link between indoor environment and workplace productivity in naturally and mechanically ventilated office environments

This paper uses a case study-based approach to empirically explore the relationship between indoor environment and workplace productivity in two naturally and mechanically ventilated office environments. Environmental parameters were continuously monitored over 19 months. Longitudinal surveys (online) recorded occupants’ perception of their working environment and self-reported productivity, while performance tasks (numerical tests, proof reading) measured cognitive capability. Indoor temperature and CO2 concentrations were found to be higher and more variable in the naturally ventilated (NV) office. Occupant perception of their indoor environment strongly correlated with their perceived productivity in both case studies. Task performance was affected by indoor environmental conditions such as indoor temperature and CO2 concentration. Interestingly in the NV office the median scores were up to 12% lower for tests conducted at CO₂ levels >1400 ppm compared to those conducted below 1400 ppm, whereas in the MV…

Type: Conference Paper/Proceeding/Abstract
Status: Live|Last updated:May 20, 2019 11:23 AM
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Sensor grid design for high resolution 3D acoustic measurements of musical instruments

Type: Conference Paper/Proceeding/Abstract
Status: Live|Last updated:May 20, 2019 11:22 AM
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Collapsing fish stocks, gendered economies, and anxieties of entrapment in coastal Sierra Leone

This article explores the economic negotiations between Sierra Leonean fishermen and the women who compete to buy their fish; tracing how relationships of gendered intimacy and interdependence are being reconfigured in a context of deepening economic precarity. Fish stocks in Sierra Leone are in crisis. Fisherfolk look back with nostalgia to a past in which bountiful harvests had made it possible for transactions of fish to be simple and impersonal. Today, by contrast, it is almost impossible for women to access fish without working to develop strong personal relationships with fishermen: deploying gifts of food, loans of money, and even secret ‘medicines’ to secure the loyalty of potential customers. I analyze how men and women reflect on their growing impoverishment through discourses that emphasize their moral ambivalence at being drawn back into webs of interpersonal dependency and argue that these anxieties need to be understood in the context of Sierra Leone’s history of domestic slavery.

Type: Journal Article/Review
Status: Live|Last updated:May 20, 2019 11:18 AM
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Candidate gene variant effects on language disorders in Robinson Crusoe Island

Robinson Crusoe Island is a geographically and socially isolated settlement located over 600km west of the Port of Valparíso, Chile. An unusually high incidence (30%) of the Chilean equivalent of developmental language disorder (TEL) has been reported in Islander children, with 90% of these affected children found to be direct descendants of a pair of original founder-brothers, therefore strongly suggesting a shared genetic basis. Here we utilise whole-genome sequencing to investigate potential underlying variants in a panel of thirty-four genes known to play a role in language disorders, in seven TEL affected and ten unaffected islanders. We use this targeted approach to look for rare, shared variants that may underlie the diagnosis of TEL in a Mendelian genetic model. We go on to test whether the overall burden of rare variants is enriched in individuals affected by TEL or with Islanders related to the founder-brother lineage. In the absence of explanatory rare variants, we further investigate these candida…

Type: Journal Article/Review
Status: Live|Last updated:May 20, 2019 11:17 AM
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Stakeholder Theory Classification Definitions and Essential Contestability

Type: book_section
Status: Live|Last updated:May 20, 2019 11:16 AM
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The finite element implementation of 3D fractional viscoelastic constitutive models

The aim of this paper is to present the implementation of 3D fractional viscoelastic constitutive theory presented in Alotta et al. 2016 [1]. Fractional viscoelastic models exactly reproduce the time dependent behaviour of real viscoelastic materials which exhibit a long "fading memory". From an implementation point of view, this feature implies storing the stress/strain history throughout the simulations which may require a large amount of memory. We propose here a number of strategies to effectively limit the memory required. The form of the constitutive equations are summarized and the finite element implementation in a Newton-Raphson integration scheme is described in detail. The expressions that are needed to be coded in user-defined material subroutines for quasi static and dynamic implicit and explicit analysis (UMAT and VUMAT) in the commercial finite element software ABAQUS are readily provided. In order to demonstrate the accuracy of the numerical implementation we report a number of benchmark probl…

Type: Journal Article/Review
Status: Live|Last updated:May 20, 2019 11:15 AM
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Supporting Ghanaian micro-entrepreneurships: The role of mobile technology

Purpose. The purpose of this paper is to explore the role of mobile technology and related service platforms in supporting informal micro-entrepreneurships in rural Ghana. It aims to extend our knowledge through the development of a conceptual model. Design/methodology/approach. A qualitative research design used in-depth semi-structured interviews with five micro-entrepreneurship owners in the Kwahu South District in the Eastern region of Ghana. Identification of potential case firms was facilitated by a local official. Interview data were analysed thematically. Findings. Mobile technology engendered pride and emotional connectedness and, being easy to use, helped to increase business confidence. Adoption advantages included improved communications with customers and business partners, and effective stock control, providing competitive advantage. Further understanding of mobile technology’s role in improving business processes is needed. Research limitations/implications. This exploratory research is based o…

Type: Journal Article/Review
Status: Live|Last updated:May 20, 2019 11:15 AM
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The crime of sexting: A deconstructive approach

This article critically assesses the legal issues surrounding the contemporary act of adolescent sexting via the philosophical methodology of ontology. Through this methodology the article aims to highlight the significance of the mobile phone, and the social objects which it produces in the world, pertaining to the act of sexting. Highlighting this device’s abilities, uses, and present-day ubiquity offers an alternate insight to both the current legislative parameters and legal commentary on sexting. This is because neither the law governing sexting, nor the majority of the legal commentary on this act, has engaged with the presence of the mobile phone in our contemporary world and the way it has revolutionised our lives. In order to offer an alternative lens through which to view this act, the article draws on the deconstructive work of Jacques Derrida and the new realist ontology of Maurizio Ferraris, to offer comment on how and why digital writing must be reckoned with in the twenty-first century. Using t…

Type: Journal Article/Review
Status: Live|Last updated:May 20, 2019 11:10 AM
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