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- Franca, Josue, 1979-, et al.
(författare)
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Analysing the interactions and complexities of the operationsin the production area of an FPSO platform using the functionalresonance analysis method (FRAM)
- 2022
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Ingår i: Arabian Journal of Geosciences. - : Springer. - 1866-7511 .- 1866-7538. ; 15
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Tidskriftsartikel (refereegranskat)abstract
- The technological evolution of several productive sectors of society has demanded the same level of evolution for the oiland gas industry, both for energy production and their own systems’ functioning. The production of crude oil and naturalgas in offshore units is one of the answers to this demand. However, these offshore units have critical onboard activities andrisks, notably FPSO units; it is necessary to have adequate recognition of the elements that can support these activities andmanage these risks, enabling productive and safe operations. In this sense, this article aims to increase the understanding ofthe complex interactions and inherent safety issues that arise in the operations of FPSOs, observing and analysing the workdone onboard such platforms. The FRAM methodology has been chosen because it allows for the recognition and analysisof the complex interactions involving workers, equipment, system and offshore environment, focusing on the oil treatmentarea of the process plant. The results demonstrated some interesting findings regarding onboard safety and the relationshipbetween human competences, work demands and process safety.
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| 2. |
- Huck, P. E., et al.
(författare)
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Semi-empirical models for chlorine activation and ozone depletion in the Antarctic stratosphere : proof of concept
- 2013
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Ingår i: Atmospheric Chemistry And Physics. - : Copernicus GmbH. - 1680-7316 .- 1680-7324. ; 13:6, s. 3237-3243
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Tidskriftsartikel (refereegranskat)abstract
- Two semi-empirical models were developed for the Antarctic stratosphere to relate the shift of species within total chlorine (Cl-y = HCl + ClONO2 + HOCl + 2 x Cl-2 + 2xCl(2)O(2) + ClO + Cl) into the active forms (here: ClOx = 2xCl(2)O(2) + ClO), and to relate the rate of ozone destruction to ClOx. These two models provide a fast and computationally inexpensive way to describe the inter- and intra-annual evolution of ClOx and ozone mass deficit (OMD) in the Antarctic spring. The models are based on the underlying physics/chemistry of the system and capture the key chemical and physical processes in the Antarctic stratosphere that determine the interaction between climate change and Antarctic ozone depletion. They were developed considering bulk effects of chemical mechanisms for the duration of the Antarctic vortex period and quantities averaged over the vortex area. The model equations were regressed against observations of daytime ClO and OMD providing a set of empirical fit coefficients. Both semi-empirical models are able to explain much of the intra-and inter-annual variability observed in daily ClOx and OMD time series. This proof-of-concept paper outlines the semi-empirical approach to describing the evolution of Antarctic chlorine activation and ozone depletion.
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| 3. |
- Andreolli, Raphael, et al.
(författare)
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Energy Consumption Evaluation of Emerging and Current Vehicle Fleets in Urban Logistics
- 2024
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Ingår i: 10th Transportation Research Arena, Dublin, Ireland, 15-18 April 2024.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Driverless multipurpose vehicles (DMVs) are an emerging vehicle concept for urban heavy-duty transport. However, little is known about their effect on urban road transport systems. Thus, the aim of this study is to analyse the total fleet energy consumption of DMVs for specific transport operations in urban logistics compared to heavy- duty battery and combustion vehicles. A novel electric vehicle routing problem was used to simulate in total 96 case-studies of operations with varying network and vehicle fleet properties. We found that the combustion vehicle fleets consumed significantly more energy for the same operation compared to the electric vehicle fleets. Although the DMV fleet and battery electric vehicle fleet showcased similar energy consumption for most case-studies, there were several operations where the DMV fleet consumed less energy and required a smaller fleet size. This study highlights the potential benefits of DMV fleets in urban logistics operations in terms of reducing total fleet energy consumption and fleet size.
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| 4. |
- Franca, Josue, 1979-, et al.
(författare)
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Analysing human factors and non-technical skills in offshore drilling operations using FRAM (functional resonance analysis method)
- 2021
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Ingår i: Cognition, Technology & Work. - : Springer. - 1435-5558 .- 1435-5566. ; 23:3, s. 553-566
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Tidskriftsartikel (refereegranskat)abstract
- Workplaces in the oil and gas (O&G) industry have evolved to become part of the modern complex sociotechnical system that characterises onshore and offshore facilities today. The intense interactions between workers, systems, equipment and processes have made companies in this sector more productive. However, significant and complex risks have also emerged. Managing them requires a methodology capable of understanding and recognising how this entire sociotechnical system works. This research uses the FRAM to model the activities performed by drillers, from the perspective of their workplace, inside the drilling unit of an offshore oil rig—a complex sociotechnical system. The interviews, on-board observations and data gathering performed as part of this study provided information that was used to build a FRAM model capable of representing the real work done by drillers inside the doghouses on offshore oil rigs. Through this model, the variability of human behaviour could be analysed in the context of the different situations that may happen, enabling researchers to understand the specific demands of the work and the correlation between WAI and WAD that naturally emerges. This FRAM-based analysis acknowledges that human factors and non-technical skills are responsible for the productive and safe execution of the work in both normal and critical operations situations, and identifies the impact of this variability—positive or negative—in the execution of daily tasks. It shows that workers’ varied responses can properly deal with complex system demands both in normal situations and in emergencies.
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| 5. |
- Park, Hee-Bok, 1973-
(författare)
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Genetic Analysis of Quantitative Traits Using Domestic Animals : A Candidate Gene and Genome Scanning Approach
- 2004
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Domestication has led to genetic changes that affect quantitative traits in farm animals. Both candidate gene analysis using association tests and genome scans based on linkage analysis have been performed to understand the molecular basis underlying quantitative genetic variation in horses, pigs and chickens. To test a possible association of polymorphisms in the PRKAG3 gene, previously found to be associated with excess glycogen content in pig skeletal muscle, with quantitative traits in the horse, the major coding part of the equine PRKAG3 sequence was identified. Bioinformatic characterization of the equine PRKAG3 gene was conducted. A single nucleotide polymorphism (SNP) causing a missense mutation (Pro258Leu) was found. Screening this SNP showed that the Leu258 allele was more frequent in breeds with heavy muscularity. To assess previously reported associations between polymorphisms in the MC4R gene and obesity-related traits further, we conducted linkage analysis between the MC4R locus and fatness-related traits using a Wild BoarxLarge White intercross. No significant association between segregation at the MC4R locus and fatness was detected in this pedigree. A genome scan of quantitative trait loci (QTLs) has been performed in an intercross between chicken lines divergently selected for growth. Divergent parental lines have been established by selecting for high and low 56-day body weight for over 40 generations. The selection has led to approximately a 9-fold difference in 56-day body weight between lines and resulted in correlated responses for a number of traits including appetite, immune response, body composition and metabolic traits. Phenotypic data on growth and other correlated traits were collected from more than 800 F2 individuals. Genome scans using 145 markers on 26 linkage groups have identified QTLs affecting growth and correlated responses to selection for 56-day body weight. No major QTL explaining a large portion of phenotypic variation in growth was revealed in this study.
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| 10. |
- Zelan, Martin, 1981-, et al.
(författare)
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Fluctuation-induced drift in a gravitationally tilted optical lattice
- 2010
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Ingår i: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics. - 1063-651X .- 1095-3787. ; 82:3
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Tidskriftsartikel (refereegranskat)abstract
- Experimental and theoretical studies are made of Brownian particles trapped in a periodic potential, which is very slightly tilted due to gravity. In the presence of fluctuations, these will trigger a measurable average drift along the direction of the tilt. The magnitude of the drift varies with the ratio between the bias force and the trapping potential. This can be closely compared to a theoretical model system, based on a Fokker-Planck equation formalism. We show that the level of control and measurement precision we have in our system, which is based on cold atoms trapped in a three-dimensional dissipative optical lattice, makes the experimental setup suitable as a testbed for fundamental statistical physics. We simulate the system with a very simplified and general classical model, as well as with an elaborate semiclassical Monte Carlo simulation. In both cases, we achieve good qualitative agreement with experimental data.
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