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4. The breakdown to turbulence of a forced vortex flow at a pipe orifice : the non-linear evolution of initially axisymmetric vortices

Author

Addison, Paul Stanley

Subjects
532, Fluid mechanics
Abstract

The primary purpose of this research is to investigate non-linear and chaotic behaviour of water in a pipeline at the transition region from laminar to turbulent flow. Turbulence was generated in the flow by the use of an orifice plate which generated coherent vortices and subsequent break-down into turbulence, downstream of the orifice. The flow regime was pulsatile. This was decided specifically to obtain better control of the experimental apparatus, better control of the frequency of vortices shedding from the orifice, and because of its wider range of practical applications discussed in section 1.3. The mechanism of vortex breakdown has been addressed many times over the past century. The process by which vortices interact and degenerate is essentially non- inear. New techniques from the field of non-linear dynamics have emerged which can yield some quantitative information about the complexity of non-linear phenomena. This thesis aims to test some of these techniques, together with more traditional methods, on the experimental time series data obtained from axisymmetric vortex breakdown of a pulsed flow at a pipe orifice. An experimental rig was designed and constructed in the Civil Engineering Department, at the University of Glasgow, to produce, accurately controllable, pulsed flows within a pipe system at an orifice plate. The apparatus was designed to allow a range of parameters to be varied over the course of the investigation. Computer algorithms were written by the author to analyse the resulting data, obtained from Laser Doppler Anemometry readings. Flow visualisation techniques were also used to give a qualitative understanding of the system. Evidence was found for the development of initially axisymmetric pulsed vortex flows to a relatively low dimensional chaotic state prior to breaking down to a more complex turbulent state. The flow complexity was probed by investigating the dynamics of phase space attractors reconstructed from time series taken at various spatial locations within the developing flow field. The two techniques used for this were the Grassberger- Procaccia dimension and the Lyapunov exponent. Reconstruction of the attractors was performed using the minimum mutual information function. The flow complexity was used in conjunction with Turbulent Intensitites within the flow and the development of the flow velocity profile, to provide a comprehensive picture of the flow field development for pulsed vortex flows. In addition, the techniques from the field of non-linear dynamics were thoroughly tested in the experimental environment. The problem of noise, and its effect on the results produced has been analysed in detail.

Published
1993

5. In Response

Author

Bergese, Sergio D., Mestek, Michael L., Kelley, Scott D., McIntyre, Robert, Jr, Uribe, Alberto A., Sethi, Rakesh, Watson, James N., and Addison, Paul S.

Published
2017
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9. T-wave alternans found in preventricular tachyarrhythmias in CCU patients using a wavelet transform-based methodology

Author

Romero, Inaki, Grubb, Neil R., Clegg, Gareth R., Robertson, Colin E., Addison, Paul S., and Watson, James N.

Subjects
Arrhythmia -- Diagnosis, Wavelet transforms -- Evaluation, Electrocardiogram -- Technology application, Electrocardiography -- Technology application, Technology application, Biological sciences, Business, Computers, Health care industry
Abstract

Ventricular tachyarrhythmias are potentially lethal cardiac pathologies and the commonest cause of sudden cardiac death. Efforts to predict the onset of such events are based on feature extraction from the surface ECG. T-wave alternans (TWAs) are considered a marker of abnormal ventricular function that may be associated with ventricular tachycardia (VT) and ventricular fibrillation. A novel TWA detection algorithm utilizing the continuous wavelet transform is described in this paper. Simulated ECGs containing artificial TWA were used to test the algorithm that achieved a sensitivity of 91.40% and a specificity of 94.00%. The algorithm was subsequently used to analyze the ECGs of eight patients prior to the onset of VT. Of these, the algorithm indicated that five patients exhibited TWA prior to the onset of the tachyarrhythmic events, while the remaining three patients did not exhibit identifiable TWA. Healthy individuals were also studied in which one short TWA episode was detected by the algorithm. However, closer visual inspection of the data revealed this to be a likely false positive result. Index Terms--ECG analysis, T-wave alternans (TWAs), ventricular tachyarrhithmia (VTA), wavelet transforms.

Published
2008

15. Odyssey 2018-2019

Author

Kruger, Joshua; Zimmerman, Callie; Carlson, Hailey; Reith, Elizabeth; Goze, Grace; Mccloskey, Shannon; Goff, Erin; Winchester, Angel; Warren, Allen; White, Jake; Steele, Julia; Kalen, Korynne; Cieslik, Emma; Townsend, Taylor; Smith, Taylor; Jessup, Abigail; Cole, Brianna; Neal, Isaiah; Akers, Allison; Jackson, Carrisma; Addison, Paul; Garrett, Jacob; Statten, Ty; Pinnick, Melody; Deal, Shelby; Thomas, Kristen; Heim, Leah; Conley, Taylor; Hoffer, Rebekkah; Spech, Christina; DeLorenzo, Lauren; McDonald, Alexa; Carey, Lane; Weisenfelder, Jackie; Armstrong, Aidan; Day, Amberly; Fulkerson, Emma; Osborne, Jevon; Lange, Megan; Scalf, Carli; Hoffert, Sophie; Holbrook, Kimberly and Kruger, Joshua; Zimmerman, Callie; Carlson, Hailey; Reith, Elizabeth; Goze, Grace; Mccloskey, Shannon; Goff, Erin; Winchester, Angel; Warren, Allen; White, Jake; Steele, Julia; Kalen, Korynne; Cieslik, Emma; Townsend, Taylor; Smith, Taylor; Jessup, Abigail; Cole, Brianna; Neal, Isaiah; Akers, Allison; Jackson, Carrisma; Addison, Paul; Garrett, Jacob; Statten, Ty; Pinnick, Melody; Deal, Shelby; Thomas, Kristen; Heim, Leah; Conley, Taylor; Hoffer, Rebekkah; Spech, Christina; DeLorenzo, Lauren; McDonald, Alexa; Carey, Lane; Weisenfelder, Jackie; Armstrong, Aidan; Day, Amberly; Fulkerson, Emma; Osborne, Jevon; Lange, Megan; Scalf, Carli; Hoffert, Sophie; Holbrook, Kimberly

Abstract

Annual scholarly and creative journal sponsored by the Ball State University Honors College.; Contents of this issue: Nightcore Until You Burst -- Wildflowers Everywhere -- The Pollinator; I'll Bee Back -- Heaven's Great Oak -- Endangered Wings -- Haikus for Thought -- Untitled -- A Friendly Face -- Thoughts on the Outlet of Catskill Lake -- Commanding Officer -- Queen -- My Soldiers -- Dark Matter and Les Friction Album Wall Art -- Urban Exploring -- Composed Of -- Margaret Talks to God -- Up In Smoke -- I Miss You In The Morning -- Evening Tea -- The Childhood I Remember -- Untitled -- Metaphor in Pencils -- Inside -- gadwall -- Wonders -- A New Phase -- Mirror Garden -- Nocturne, Op. 4 -- FUTURE IN MIRROR -- Until You Know Grief -- Afternoon Rain -- The Shadows -- "For a long time, I have had this bad habit" -- Blue Ice Spears -- Life and Death -- The Stars Are Dying Out -- Hellooooo -- Masque de Mort -- Late Nights -- March 11th, 2018. 3 a.m. -- Cease, Monster -- "Please don't let the bitterness" -- A Quaker Awakening -- Starshine -- After-Storm-Shining -- Love, Multiplied -- a certain type of navigation; or, polaris -- Sanctuary -- Orthocloud -- Searching -- It's Not Just A Weed -- Yellow -- Confidence -- "I've never been great at expressing appreciation" -- Desolate Heavens -- Window -- Towards Home -- Untitled -- To the Lover -- Frustrate -- a moment in time -- Earthen versus Manmade -- "Sometimes I am lost at sea" -- We Are In A Basin Before We Realize -- Jade's Sonnet -- Bring Me The Night, This archival material has been provided for educational purposes. Ball State University Libraries recognizes that some historic items may include offensive content. Our statement regarding objectionable content is available at: https://dmr.bsu.edu/digital/about

Published
2018

17. What Difference Did the War Make?

Author

Addison, Paul

Subjects
What Difference Did the War Make? (Book), Books -- Book reviews, History, Regional focus/area studies
Abstract

A number of papers given at the third annual summer school of the Institute of Contemporary British History have been collected in What Difference Did the War Make?, ed. Brian [...]

Published
1996

18. Power, Competition and the State, vols. 2-3

Author

Addison, Paul

Subjects
Power, Competition and the State, Vols. 2-3 (Book), Books -- Book reviews, History, Regional focus/area studies
Abstract

HISTORIANS of twentieth-century British politics are fixated on party. Hence monographs on party themes abound and every leading party politician attracts a biographer. On their individual merits, such works often [...]

Published
1993

20. WAVELET TRANSFORM ANALYSIS OF OPEN CHANNEL WAKE FLOWS

Author

Addison, Paul S., Murray, Kevin B., and Watson, James N.

Subjects
Wakes (Aerodynamics) -- Research, Signal processing -- Research, Fourier analysis -- Evaluation, Turbulence -- Research, Engineering research -- Analysis, Science and technology
Abstract

Wavelet transform analysis offers a new approach to signal processing through its ability to decompose signals in both time and frequency. As such, it is more suited to nonstationary and intermittent signals than traditional Fourier analysis. The first part of this paper provides an introduction to the theory and signal processing properties of both continuous and discrete wavelet transform analysis. An account is then given of the application of wavelet transform analysis to a variety of experimental open channel wake flows. Feature location is undertaken using a continuous wavelet transform, and both turbulent statistical analysis and thresholding of the turbulent signal components are undertaken using a discrete wavelet transform.

Published
2001

30. Health

Author

Addison, Paul, Jones, Harriet, Welshman, John, Addison, Paul, Jones, Harriet, and Welshman, John

Published
2005

31. Post-war Britain, 1945-1964: Themes and Perspectives

Author

Addison, Paul

Subjects
Post-War Britain, 1945-1964: Themes and Perspectives (Book), Books -- Book reviews, History, Regional focus/area studies
Abstract

Thirteen essays on the history of Britain since 1945, some of which originated as papers to the first summer school of the Institute of Contemporary British History, have been collected [...]

Published
1993

33. Reviews of Books

Author

Bryder, Linda, primary, Reed, Clyde G., additional, Treadgold, Warren, additional, Little, Donald P., additional, France, John, additional, Agnew, John, additional, Hostetler, Laura, additional, Segal, Ethan I., additional, Quataert, Jean H., additional, Ruiz, Teofilo F., additional, Wolfart, Johannes C., additional, Bergmann, Peter, additional, Kishlansky, Mark, additional, Bauer, Ralph, additional, Elman, Benjamin A., additional, Vance, Michael E., additional, Christopher, Emma, additional, Goode, James F., additional, Perdue, Peter C., additional, Ford, Caroline, additional, Kundrus, Birthe, additional, Seed, Patricia, additional, Gould, Eliga H., additional, Crews, Robert D., additional, Smith, Geoffrey S., additional, Legassick, Martin, additional, Unterberger, Betty Miller, additional, Bowman, Timothy, additional, Berger, Stefan, additional, Naranch, Bradley, additional, Dickinson, Frederick R., additional, Herwig, Holger H., additional, Winter, Jay, additional, Shaw, Amy, additional, Ambrosius, Lloyd E., additional, Chabal, Patrick, additional, Bosworth, R. J. B., additional, Kent, Peter C., additional, Addison, Paul, additional, Quiney, Linda J., additional, Gillingham, John, additional, Olesen, Thorsten B., additional, McMahon, Robert J., additional, Midford, Paul, additional, Reid, Donald, additional, Wolff, Larry, additional, Mawdsley, Evan, additional, Bradley, Mark Philip, additional, Levine, Steven I., additional, Granieri, Ronald J., additional, Greene, Naomi, additional, Crosby, Ann Denholm, additional, Gendzier, Irene, additional, Blight, James G., additional, Baber, Zaheer, additional, Frey, Marc, additional, Berggren, Lars, additional, Hoffmann, Judith, additional, Tibi, Bassam, additional, Sherry, Michael S., additional, Boulby, Marion, additional, Jung, Dietrich, additional, Saxer, Carl J., additional, Johnston, Andrew M., additional, Warburton, Alan, additional, Adelman, Jeremy, additional, Kivisto, Peter, additional, Geva, Dorith, additional, Müllerson, Rein, additional, Gelvin, James L., additional, Østerud, Øyvind, additional, and Crosby, Alfred W., additional

Published
2009
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34. Reviews of Books

Author

Ashton, Sally-Ann, primary, Pines, Yuri, additional, Sharkey, Heather J., additional, Arnold, Benjamin, additional, Tyerman, Christopher, additional, Martin, Joel W., additional, Sloan, Kim, additional, Williams, Glyndwr, additional, Muirhead, Bruce, additional, Mayhew, Robert J., additional, Bliss, Robert M., additional, Black, Jeremy, additional, Rodger, N. A. M., additional, Steele, Ian K., additional, Cassis, Youssef, additional, Brands, H. W., additional, Grewal, Inderpal, additional, Duffy, Michael, additional, Lambert, Andrew, additional, LeDonne, John P., additional, Saab, Ann Pottinger, additional, Chamberlain, Muriel E., additional, Addison, Paul, additional, Pope, S. W., additional, Neilson, Keith, additional, Hagen, Mark von, additional, Rabe, Stephen G., additional, Carroll, Francis M., additional, Eckes, Alfred E., additional, Fieldhouse, D. K., additional, Gibson, Craig, additional, Stevenson, David, additional, Archer-Straw, Petrine, additional, Schwabe, Klaus, additional, Förster, Jürgen, additional, Johnson, Molly Wilkinson, additional, Esenwein, George, additional, Mawdsley, Evan, additional, Clinefelter, Joan L., additional, MacKenzie, S. P., additional, Crane, Conrad G., additional, Burkman, Thomas W., additional, Sherry, Michael S., additional, Berger, Stefan, additional, Vourkoutiotis, Vasilis, additional, Iriye, Akira, additional, Stephan, John J., additional, Gangloff, Eric J., additional, Wakabayashi, Bob Tadashi, additional, Gillingham, John, additional, Schenk, Catherine R., additional, Horowitz, Daniel, additional, Singer, Barnett, additional, Madokoro, Laura, additional, Young, Marilyn B., additional, Catton, Philip E., additional, Kochavi, Noam, additional, Burton, Antoinette, additional, Müllerson, Rein, additional, Lundgreen-Nielsen, Kay, additional, Hess, Gary R., additional, Matray, James I., additional, Wolff, Tobias Barrington, additional, Nattrass, Nicoli, additional, Agnew, John, additional, Lal, Deepak, additional, Cassels, Alan, additional, Millen, Raymond, additional, and Kennedy, Paul, additional

Published
2008
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35. Stochastic Subsurface Flow and Transport in Fractal Conductivity Fields

Author

NAPIER UNIV EDINBURGH (SCOTLAND) CIVILENGINEERING GROUP SCHOOL OF BUILT ENVIRONMENT, Ndumu, Alberto S., Addison, Paul S., NAPIER UNIV EDINBURGH (SCOTLAND) CIVILENGINEERING GROUP SCHOOL OF BUILT ENVIRONMENT, Ndumu, Alberto S., and Addison, Paul S.

Abstract

Monte Carlo simulations of subsurface flow and contaminant transport of a non-reactive solute plume by steady-state flow with a uniform velocity were performed in a two-dimensional synthetic heterogeneous porous media whose hydraulic conductivity is non-stationary and described by multiscale fractional Brownian motion. Analysis of the flow and transport results indicates that the longitudinal velocity variance is nearly constant in the longitudinal direction while in the transverse direction it assumes a parabolic shape. The velocity variance is maximum at the impervious boundaries and decreases in transverse direction with distance from the boundaries reaching the minimum value at the domain center. We observe that the particle displacement covariance is anomalous or non-Fickian at all times t in the dispersion process irrespective of the Hurst exponent H and grows temporally faster than linearly., Pres. at Fractal 2000, "Complexity and Fractals in the Sciences", 6th International Multidisciplinary Conference, 16-19 Apr 2000, Singapore. --Original contains color plates: All DTIC reproductions will be in black and white. This article is from ADA392358 Paradigms of Complexity. Fractals and Structures in the Sciences

Published
2000

41. The Echo of War. Home Front Propaganda and the Wartime BBC, 1939-1945

Author

ADDISON, PAUL

Subjects
The Echo of War. Home Front Propaganda and the Wartime BBC, 1939-1945 (Book), Books -- Book reviews, History, Regional focus/area studies
Abstract

The BBC is often said to have made a crucial contribution to the unity and morale of the British people during the Second World War. As Sian Nicholas shows in [...]

Published
1998

42. Book Reviews

Author

Roland, Charles G., primary, Ashton, N. G., additional, Brown, Elizabeth A. R., additional, Brundage, James A., additional, Dennis, Peter, additional, Pierson, Peter, additional, Levy, Avigdor, additional, Storrs, Christopher, additional, Williams, Glyndwr, additional, Littlefield, Daniel C., additional, Aron, Stephen, additional, Bannister, Robert C., additional, Roe, Michael, additional, Buckner, P. A., additional, Bridge, Carl, additional, Rubinstein, W. D., additional, Ferris, John, additional, Collin, Richard H., additional, Fry, Joseph A., additional, Robinson, Michael, additional, O'Rourke, Kevin, additional, Flint, John, additional, Moore, Robin J., additional, McKercher, B. J. C., additional, Addison, Paul, additional, Wilson, Trevor, additional, Rudd, Jeffery, additional, McFadden, David W., additional, Murray, Williamson, additional, Foglesong, David S., additional, Clifford, Nicholas R., additional, Faber, Peter R., additional, De Groot, Gerard J., additional, Whealey, Robert H., additional, Callahan, Raymond, additional, Michelson, Paul E., additional, Lloyd, Trevor, additional, Knight, Robert, additional, Young, John W., additional, Shai, Aron, additional, Cohen, Stuart A., additional, Ovendale, Ritchie, additional, Minogue, Kenneth, additional, MacDonald, Callum, additional, Millar, T. B., additional, Herwig, Holger H., additional, Hanhimäki, Jussi M., additional, Wagle, N. K., additional, Gallicchio, Marc, additional, and Post, Gaines, additional

Published
1993
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