23,269 research outputs found
Dataset in support of the paper 'Towards quantifying biomarkers for respiratory distress in preterm infants: Machine learning on mid infrared spectroscopy of lipid mixtures'
No full textDataset supporting the publication:
W. Ahmed, A. V. Veluthandath, J. Madsen, H. W. Clark, A Dushianthan, A. D. Postle, J. S. Wilkinson, G. S. Murugan, "Towards quantifying biomarkers for respiratory distress in preterm infants: Machine learning on mid infrared spectroscopy of lipid mixtures", Talanta, Volume 275, 2024, 126062, ISSN 0039-9140 DOI: https://doi.org/10.1016/j.talanta.2024.126062
The data contains the csv files with data used to generate the figures in the main manuscript. Each file has a header corresponding to the data in each of the comma separated columns.
Related projects:
Engineering and Physical Sciences Research Council (EPSRC) grant no: EP/S03109X/1
Dataset available under a CC BY 4.0 licence
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The current status of Neocnus Arredondo, 1961 (Mammalia: Edentata: Pilosa: Megalonichidae) and a replacement name for its junior homonym in the sea cucumber family Cucumariidae (Echinodermata:Holothuroidea: Dendrochirotida: Cucumariidae)
No full textAhmed S. Thandar, Lazaro W. V. Vinola (2017): The current status of Neocnus Arredondo, 1961 (Mammalia: Edentata: Pilosa: Megalonichidae) and a replacement name for its junior homonym in the sea cucumber family Cucumariidae (Echinodermata:Holothuroidea: Dendrochirotida: Cucumariidae). Zootaxa 4337 (2): 288-290, DOI: https://doi.org/10.11646/zootaxa.4337.2.
Formal Specification of OWL-S with Object-Z
No full textSemantic Web Services, one of the most significant research areas within the Semantic Web vision, has been recognized as a promising technology that exhibits huge commercial potential, and attracts a great deal of attention from both the research community and Industry. OWL-S, one of the most significant Semantic Web Service ontologies proposed to date, provides Web Service providers with a core ontological framework and guidelines for describing the properties and capabilities of their Web Services in unambiguous, computer-intepretable form. To support standardization and tool support of OWL-S, a formal semantics of the language is highly desirable. In this paper, we present a formal Object-Z semantics of OWL-S. Different aspects of the language have been precisely defined within one unified framework. This model not only provides a formal unambiguous model which can be used to develop tools and facilitate future development, but as demonstrated in the paper, can be used to identify and eliminate errors in the current documentation
Investigation of relationship between drag and lift coefficients for a generic car model
No full textThe paper presents a study of aerodynamic characteristics of a car, which has the simplified geometric shape, so called Ahmed body. Flow around the body and the influence of its rear slant angle on drag are widely studied by numerous researchers. However, small number of studies treats the relationship between drag and lift and this phenomenon is not fully understood. To clarify the relationship between lift and drag, experiments are conducted in the wind tunnel of ENSAM - Paris. The study is carried out for different rear slant angles in order to determine how the drag coefficient varies with lift. The results of experiments are completed by numerical simulations, which permit to obtain the detailed flow field around Ahmed body and to understand better the effect of rear slant angle on drag and lift coefficients
Investigation of the Ahmed body cross-wind flow topology by robotic volumetric PIV
No full textRobotic volumetric PIV is employed to investigate the time-averaged three-dimensional near-wake flow topology of the Ahmed body in steady cross-wind conditions. The model selected for this study is a 1:2 replica of the reference Ahmed body with 25° slant angle. The measurements are conducted at free-stream velocity of 12 m/s, resulting in a Reynolds number of 1.15×105 based on the model’s height. Yaw angles of 0°, 4° and 8° are considered. The results show that the position and strength of the C-pillar vortices are significantly influenced by the presence of a yaw angle. The yaw angles cause an increase in the strength of the windward C-pillar vortex, with a consequent upward displacement; conversely, the strength of the leeward vortex decreases, and the position of its core moves downwards and inboard. At the larger yaw angle, the presence of a ground streamwise vortex is detected which co-rotates with the windward C-pillar vortex and is located between the latter and the ground.Aerodynamic
High resolution schemes for bluff-body aerodynamics
No full textThis MSc by Research study has been conducted with the application of a
variety of grid configurations for extensive grid analysis along with various numerical
schemes on the Ahmed body benchmark test case, in both 2D and 3D analysis.
A number of different numerical schemes were used in conjunction with the
Reynolds Averaged Navier – Stokes (RANS) equations for steady state simulations, by
implementing the Spalart – Allmaras turbulence model as a closure to the equations.
The efficiency of the aforementioned grid – numerical schemes compilation in
terms of achieving physically meaningful results is assessed in both commercial, widely
– used solvers (FLUENT) and the Cranfield University in – house developed UCNS3D
code, ultimately aiming to capture and exhibit the differences in the implementation
of similar configurations in different solvers for high resolution methods.
The simulation results are analysed further and an extensive conclusion
analysis takes place for all the cases examined, with the combination of numerical
methods and grid configurations used.
It should be pointed here that the purpose of this study is to capture and study
the main aspects of the flow in 2D and 3D dimension simulations, as well as the
assessment of a compilation of numerical schemes never applied and studied before in
the Ahmed body case, in an effort for further insight and physically meaningful results
in the case. The aim of this study is not to provide results for effective implementation
of the turbulence modelling in the Ahmed body test case
Effective Virtual Teams for New Product Development
No full textAt present, the existing literature shows that the factors which influence the effectiveness of virtual teams for new product development are still ambiguous. To address this problem, a research design was developed, which includes detailed literature review, preliminary model and field survey. From literature review, the factors which influence the effectiveness of virtual teams are identified and these factors are modified using a field survey. The relationship between knowledge workers (people), process and technology in virtual teams is explored in this study. The results of the study suggest that technology and process are tightly correlated and need to be considered early in virtual teams. The use of software as a service, web solution, report generator and tracking system should be incorporated for effectiveness virtual teams
Określenie strat ciśnienia przy przepływie laminarnym cieczy opisanej równaniem potęgowym z granicą płynięcia w niecentrycznej przestrzeni pierścieniowej
No full textAccurate predictions of friction pressure losses are very important in drilling and well completions operations. In some applications, for example, drilling in areas where the margin between pore pressure and fracture pressure gradients is small, inaccurate predictions of bore hole pressure may lead to serious complications and even a loss of the well. This paper is focused on a flow of yield power law type (pseudo-plastic with the yield stress) fluid in the annular space with the possibility that the inner pipe maybe eccentric. A new mathematical model that is based on a concept of generalized average wall shear rate - wall shear stress relationship is presented. A carefully designed laboratory facility that permits accurate differential pressure measurements as a function of flow rate in both pipe and annular flow has been developed. The desired rheology of the fluids was obtained by mixing two types of polymers (PAC and HEC) with water. Pipe flow measurements have been utilized to produce flow curves and subsequently the fluid rheological characterization (yield stress, consistency index and flow behavior index). The results of measured pressure losses are compared to those predicted by the proposed model. While the discrepancies are noticeable the difference is less than 15% and frequently is even less than 5%. We believe that the proposed model is simple useful for practical design applicationsDokładne określenie strat ciśnienia przepływu płuczki w otworze jest bardzo ważne podczas wiercenia i dowiercania. W niektórych warunkach np. podczas wiercenia w interwałach, gdzie różnica między ciśnieniem porowym a gradientem ciśnienia szczelinowania jest mała, niedokładne określenie ciśnienia w otworze może prowadzić do poważnych komplikacji z likwidacją otworu włącznie. Artykuł dotyczy przepływu płynu posiadającego granicę płynięcia, opisanego równaniem potęgowym, w przestrzeni pierścieniowej, w sytuacji niecentrycznego ułożenia przewodu wiertniczego w stosunku do rur okładzinowych lub ściany otworu. Przedstawiony, model matematyczny oparty jest na idei średniej uogólnionej wartości naprężenia ścinającego przy ścianie otworu. Zaprojektowano i wykonano urządzenie laboratoryjne umożliwiające dokładny pomiar strat ciśnienia przy zmiennych prędkościach przepływu w rurze i przestrzeni pierścieniowej. Do badań użyto dwóch typów roztworów polimerów: PAC i HEC, o wymaganych parametrach reologicznych. Pomiary na stanowisku badawczym były podstawą do wykreślenia krzywych płynięcia ww. płynów, jak również do określenia parametrów reologicznych takich, jak: granica płynięcia, współczynnik konsystencji i współczynnik n (miara odchylenia od cieczy newtonowskiej). Wyniki pomiarów strat ciśnienia porównane zostały z wynikami uzyskanymi z obliczeń sporządzonych na podstawie prezentowanego modelu. Jakkolwiek rozbieżności są zauważalne, to jednak różnice nie przekraczają 15%, a w niektórych przypadkach nawet 5%. Mamy nadzieję, że proponowana metodyka będzie z powodzeniem wykorzystywana w zastosowaniach praktycznyc
Mellin-Transform-Based Performance Analysis of FFH -ary FSK Using Product Combining for Combatting Partial-Band Noise Jamming
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