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1. Imaging Fractal Conductance Fluctuations and Scarred Wave Functions in a Quantum Billiard

Author

Crook, R., Smith, C. G., Graham, A. C., Farrer, I., Beere, H. E., and Ritchie, D. A.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

We present scanning-probe images and magnetic-field plots which reveal fractal conductance fluctuations in a quantum billiard. The quantum billiard is drawn and tuned using erasable electrostatic lithography, where the scanning probe draws patterns of surface charge in the same environment used for measurements. A periodicity in magnetic field, which is observed in both the images and plots, suggests the presence of classical orbits. Subsequent high-pass filtered high-resolution images resemble the predicted probability density of scarred wave functions, which describe the classical orbits., Comment: 5 pages, 4 figures To be published in PRL

Published
2003
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3. Modification of 1D Ballistic Transport using an Atomic Force Microscope

Author

Crook, R., Smith, C. G., Simmons, M. Y., and Ritchie, D. A.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

We have used the scanning charged tip of an Atomic Force Microscope (AFM) to produce images of the conductance variation of a quantised 1D ballistic channel. The channel was formed using electron beam defined 700 nm wide split gate surface electrodes over a high mobility GaAs/AlGaAs heterostructure with a two dimensional electron gas (2DEG) 98 nm beneath the surface. We operate the AFM at 1.5 K and 4.2 K in magnetic fields up to 2 T to observe several phenomena. With a dc voltage on the AFM tip we have produced conduction images of the tip potential perturbation, as the channel is a sensitive probe of the electrostatic potential. We have also performed gate sweeps with the tip at a series of points across the width of the channel. The observed structure in transconductance corresponds to the theoretical electron density for the first three sub-bands. When certain gates were biased near pinch off, stable two level switching was observed in the images. We were able to control the state of the switch with the gate bias and tip position, and so roughly locate the position of the switching source. One of the responsible defect systems was located beneath the 2DEG, and due to screening of the tip potential, the image reveals the 1D channel. By asymmetrically biasing the two gate electrodes we have produced images showing a total channel movement of 102 nm across the width of the channel, but accompanied by 201 nm of movement along the length of the channel which is due to imperfections in the surface electrodes and disorder in the doping layer., Comment: 8 pages, 4 figures, ICPS-24

Published
1999

4. Combining a low-temperature scanning charged probe with low-dimensional semiconductor devices

Author

Crook, R.

Subjects
537.622
Abstract

This dissertation describes a project that brought together the physics of low-dimensional devices with the technology of low-temperature scanning probes. The low-dimensional devices were single or double quantum wires where electron motion is effectively restricted to a single dimension. Initially, the scanning probe functioned as an atomic force microscope (AFM) to locate a quantum wire. Without moving the AFM tip, the circuitry was changed to convert the scanning probe into a scanning charged tip. As the charged tip scanned over the device surface, the resistance of the device was recorded to build up an image. When the charged tip scanned over the quantum wire, the device resistance deviated. The images revealed broad structure which measured the electric potential of the tip itself, with additional small scale structure when the tip was positioned over the centre of the quantum wire. The small scale structure is a representation of quantum-mechanical electron modes resulting from modulations to the 1D eigenenergies. This experiment show electron density through low-dimensional devices. Both ends of the quantum wire were connected to a two-dimensional electron system (2DES) from which the resistance measurements were taken. When the tip scanned the 2DES region just outside the quantum wire, the tip's electric field scattered electrons. A small proportion of the electrons injected out of the quantum wire into the 2DES were scattered back through the quantum wire. This process is known as backscattering, which reduces the net electron flow through the quantum wire and increases the device resistance. The images revealed cones emanating from the quantum wires, to provide information on the angular distribution of injected electrons.

Published
2000

6. An exploration of the concept of identity in people who use drugs and their substance-related decision making

Author

Crook, R

Abstract

Obtaining a greater understanding of the meanings and motivations for the consumption of drugs is an important part of targeting drug-prevention and harm reduction strategies, particularly when considering why people continue to use drugs after initial experimentation, or where there may be a high probability of harm. By exploring the concept of identity in people who use drugs (PWUD) and how this affects their substance-related decision making, it may be possible to broaden understandings of use and develop more relevant and responsive interventions. This programme of PhD research explored the development and expression of drug-related identity in young adults, and sought to understand how drug use and the associated lifestyles and practices featured as part of a young adult’s general identity. The research investigated how PWUD negotiate potential problems and risks associated with drug-identity related behaviour, and explored belongingness and capital in the formation and expression of identities. The design was multi-phase and used mixed methods. In the first phase, participants completed an online survey. Multivariate statistical analyses were used to identify three latent profiles of PWUD who differed on their responses to key questions concerning identity and drug use, specifically, drug-related cultural capital, differentiated normalisation to recreational drug use, and belongingness to a drug culture. The largest class consisted of those with a ‘salient drug user identity’, while belonging to the other two classes indicated either a ‘moderate’ or ‘non-salient’ drug user identity. For the next phase of research, purposeful sampling techniques were used to recruit young adults who use drugs for individual interviews. Interpretative Phenomenological Analysis was used to examine the concept of ‘drug user identity’ in more detail. Findings generated three overarching themes, which present a framework for understanding how drug use and the associated lifestyles and practices feature as part of the identities of PWUD, and developed a concept of ‘drug user identity’, that is established, maintained, and negotiated within a broader sense of self. The project offers novel insights for understanding belongingness and capital between PWUD that can help inform targeted harm reduction strategies for different profiles of PWUD, without reinforcing stigma associated with drug use, or further marginalising other groups of people who use drugs; these include approaches to drug use in higher education settings and harm reduction approaches that consider the gendered use of recreational drugs.

Published
2023
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10. Genetic Variability and Alzheimer’s Disease

Author

Hardy, J., Mullan, M., Crawford, F., Duff, K., Crook, R., Diaz, P., Bennett, C., Houlden, H., Fidani, L., Goate, A., Parfitt, M., Roques, P., Rossor, M., Chartier-Harlin, M.-C., Christen, Yves, editor, Masters, C. L., editor, Beyreuther, K., editor, Trillet, M., editor, and Christen, Y., editor

Published
1994
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15. Outcomes of obstructed abdominal wall hernia: results from the UK national small bowel obstruction audit

Author

Lee, MJ, Drake, TM, Sayers, AE, Walsh, CJ, Davies, MM, Fearnhead, NS, Abercrombie, J, Acheson, A, Alderson, D, Anderson, I, Bach, S, Davies, M, Hamady, Z, Hind, D, Hollyman, M, Hare, S, Lee, E, Northover, J, Lewis, C, Marriott, P, Maynard, N, Murray, D, Tierney, G, Verjee, A, Wild, J, Abbott, S, Abdulaal, Y, Afshar, S, Ah‐Chuen, J, Ahmed, T, Akhtar, M, Akram, F, Aldred, E, Ali, A, Aly, M, Amajuoyi, A, Amin, V, Anderson, D, Anderson, O, Andreou, A, Ansari, A, Appleton, S, Ardley, R, Arshad, F, Ashour, O, Asour, A, Athem, A, Athersmith, M, Ayoub, F, Azeem, H, Azhar, B, Badenoch, T, Baillie, C, Bandyopadhyay, D, Barker, J, Barker, S, Barkham, B, Baron, R, Barrie, J, Barry‐Yarrow, E, Bashir, G, Battersby, N, Bazoua, G, Behar, N, Bellam, S, Berger, C, Bhandari, S, Bhasin, S, Biggs, S, Bisset, C, Blake, L, Blencowe, N, Boam, T, Boddy, A, Boereboom, C, Bogdan, M, Bogle, R, Bohra, P, Boland, M, Bolkan, H, Borg, C, Boulton, R, Bouras, G, Boyer, M, Boyle, J, Branagan, G, Brewer, H, Briggs, C, Broadhurst, J, Brown, E, Brown, J, Brown, L, Brown, O, Burns, K, Butcher, K, Butler, M, Byrne, B, Campbell, L, Capper, C, Cartmell, M, Cash, T, Chan, S, Chandratreya, N, Chapman, J, Chapman, S, Charalabopoulos, A, Cheek, C, Chok, S, Choong, W, Chow, M, Chowdhury, J, Coe, P, Conaghan, P, Conn, G, Cook, N, Cook, T, Cooper, S, Cornish, J, Cotton, D, Cox, C, Coyne, P, Crook, R, Crozier, J, Cuffolo, G, Cunha, P, Curtis, N, Cutting, J, Da Costa, K, Silva, L, Das, B, Davenport, M, Davies, J, Davies, T, Day, A, Dayal, S, Dean, S, Demetriou, G, Dengu, F, Dennis, R, Dent, H, Dent, P, Deputy, M, Devoto, L, Di Benedetto, G, Dindyal, S, Donnelly, E, Doody, P, Douka, E, Downham, C, Dowson, H, Edent, H, Edgerton, K, Ekpete, N, El Farran, M, Elamin, O, Eljaafari, M, Elsaid, N, El‐Sharif, M, Evans, J, Evans, M, Ewe, R, Ewing, A, Exarchou, K, Fallaize, R, Faoury, M, Farag, S, Farinella, E, Faulkner, G, Ferguson, H, Fisher, O, Fletcher, J, Forouzanfar, A, Foster, A, Fox, R, Francis, N, Fretwell, V, Fung, D, Gammeri, E, Garnham, J, Geraghty, A, Gilbert, A, Gill, C, Gill, M, Gillespie, M, Giordano, P, Glasbey, J, Goh, M, Golder, A, Green, N, Gregoir, T, Grey, T, Groundwater, E, Grove, T, Growcott, S, Gunasekaran, S, Habib, H, Haddow, J, Halahakoon, V, Halkias, C, Hall, C, Hampson, A, Hancock, L, Hanna, T, Hannay, J, Harikrishnan, A, Harries, R, Harris, G, Hartley, J, Harvey, K, Hawkin, P, Hawkins, J, Healy, R, Heard, R, Heartshorne, R, Heller, S, Hendra, L, Herrod, P, Heywood, N, Hicks, G, Hobson, B, Holtham, S, Hope, C, Hopley, P, Hossain, T, Hossaini, S, Howse, F, Hubbard, T, Humphreys, A, Ikram, H, Ioannis, M, Iqbal, M, Iqbal, N, Jain, R, Jatania, J, Jenkinson, P, Jokhan, S, Jones, A, Jones, C, Jones, L, Joshi, H, Joshi, K, Joy, M, Jull, P, Kakaniaris, G, Kallam, R, Kane, E, Kang, P, Kanitkar, R, Kauser, S, Kazmi, F, Kedrzycki, M, Kelly, S, Kendall, J, Khan, M, Khan, T, King, G, Kisiel, A, Kitsis, C, Kolawole, I, Korambayil, S, Kosasih, S, Kosti, A, Kotb, A, Kouris, S, Kshatriya, K, Kumar, S, Lafaurie, G, Lal, R, Lau, A, Lazim, T, Lazzaro, A, Lee, K, Lefroy, R, Leinhardt, D, Lennon, H, Leong, K, Levy, B, Lim, E, Lim, J, Lindley, S, Liu, D, Lloyd, P, Locker, D, Lockwood, S, Lowe, C, Lund, J, Lunevicius, R, Lunt, A, Lutfi, S, Luther, A, Luwemba, S, Mahankali‐Rao, P, Mahroof, S, Mai, D, Majid, S, Malik, A, Malik, K, Mann, K, Mansour, S, Manu, N, Mapara, R, Martin, C, Martin, J, Martin, R, Mason, C, Massey, L, Mathias, J, Mathur, P, Maude, K, McArthur, D, McCain, S, McCluney, S, McFall, M, McIlroy, B, McKay, S, McKinley, N, McNair, A, McWhirter, D, Mekhail, P, Mellor, K, Merchant, J, Merker, L, Messenger, D, Miles, A, Mir, S, Mishra, A, Mistry, P, Miu, V, Moat, M, Mockford, K, Mohamed, E, Mohamed, I, Mondragon‐Pritchard, M, Moore, N, Moretti, L, Morris, H, Morrison, T, Morrison‐Jones, V, Moss, J, Moug, S, Mountford, D, Moynihan, R, Muhammad, K, Muldoon‐Smith, D, Mulholland, J, Mullan, M, Murgitroyd, E, Murugaiyan, K, Myers, A, Mykoniatis, I, Nana, G, Nash, T, Nassar, A, Newton, R, Ng, C, Ng, P, Nguyen, K, Nicholas, F, Noor, M, Nowers, J, Nugent, C, Nunn, A, Nunn, R, Obeid, N, O'Callaghan, J, O'Hara, R, Oke, O, Olivier, J, O'Neill, A, O'Neill, S, Osei‐Bordom, D, Osgood, L, Panagiotopoulos, S, Panchasara, B, Parks, R, Patel, H, Patel, P, Patel, R, Patel, S, Pawelec, K, Payne, C, Pearson, K, Perin, G, Peristerakis, I, Petronio, B, Phelan, L, Phillips, J, Pisaneschi, C, Pitt, J, Plunkett‐Reed, K, Ponchietti, L, Pouzi, A, Pouzi, M, Powell, A, Powell‐Chandler, A, Pranesh, N, Proctor, V, Pywell, S, Qureshi, A, Qureshi, N, Rahman, M, Rai, Z, Ramcharan, S, Rangarajan, K, Rashid, M, Reader, H, Rehman, A, Rehman, S, Rengifo, C, Richards, E, Richardson, N, Robinson, A, Robinson, D, Rossi, B, Rutherford, F, Sadien, I, Saghir, T, Sahnan, K, Salahia, G, Sarveswaran, J, Saunders, M, Scott, B, Scott, K, Seager, A, Seal, S, Sezen, E, Shaban, F, Shah, P, Shahmohammadi, M, Shamsiddinova, A, Shankar, S, Sharpe, A, Shatkar, V, Sheel, A, Shields, T, Shinkwin, M, Shurmer, J, Siddika, A, Siddiqui, S, Simson, R, Sinclair, P, Singh, B, Singh, S, Sivaraj, J, Skaife, P, Skelly, B, Skinner, A, Slim, N, Smart, C, Smart, N, Smith, F, Smith, I, Smith, R, Spence, G, Sreedhar, A, Steinke, J, Stevenson, L, Stewart‐Parker, E, Stott, M, Stubbs, B, Stylianides, N, Subramonia, S, Swinkin, M, Swinscoe, M, Symons, N, Tahir, W, Taj, T, Takacs, K, Tam, J, Tan, K, Tani, S, Tanner, N, Tao, D, Taylor, M, Thava, B, Thippeswamy, K, Thomas, C, Thompson, E, Thompson, R, Thompson‐Reil, C, Thorn, C, Tongo, F, Toth, G, Turnbull, A, Turnbull, J, Valero, C, Boxel, G, Varcada, M, Venn, M, Ventham, N, Venza, M, Vimalachandran, D, Virlos, I, Wade, T, Wafi, A, Waite, K, Walker, M, Walker, N, Walker, T, Walsh, U, Wardle, S, Warner, R, Watfah, J, Watson, N, Watt, J, Watts, J, Wayman, J, Weegenaar, C, West, H, West, M, Whitehurst, L, Whyler, M, Wiggans, M, Wijeyekoon, S, Williams, G, Williams, R, Williamson, A, Williamson, J, Wilson, J, Winter, A, Wolpert, L, Wong, J, Yeap, E, Yeong, T, Zaman, S, Zappa, B, and Zosimas, D

Subjects
Adult, Male, medicine.medical_specialty, National Audit of Small Bowel Obstruction Steering Group and National Audit of Small Bowel Obstruction Collaborators, Incisional hernia, lcsh:Surgery, 030230 surgery, Abdominal wall, 03 medical and health sciences, 0302 clinical medicine, Postoperative Complications, NASBO Collaborators, medicine, Humans, Hernia, Hospital Mortality, General, Emergency Treatment, Aged, Proportional Hazards Models, Aged, 80 and over, Groin, business.industry, Mortality rate, Hazard ratio, West Midlands Research Collaborative, General Medicine, Odds ratio, Original Articles, lcsh:RD1-811, Middle Aged, medicine.disease, Quality Improvement, United Kingdom, Surgery, Hernia, Abdominal, Bowel obstruction, medicine.anatomical_structure, Logistic Models, 030220 oncology & carcinogenesis, Original Article, Female, business, NASBO Steering Group, Intestinal Obstruction
Abstract

Background Abdominal wall hernia is a common surgical condition. Patients may present in an emergency with bowel obstruction, incarceration or strangulation. Small bowel obstruction (SBO) is a serious surgical condition associated with significant morbidity. The aim of this study was to describe current management and outcomes of patients with obstructed hernia in the UK as identified in the National Audit of Small Bowel Obstruction (NASBO). Methods NASBO collated data on adults treated for SBO at 131 UK hospitals between January and March 2017. Those with obstruction due to abdominal wall hernia were included in this study. Demographics, co‐morbidity, imaging, operative treatment, and in‐hospital outcomes were recorded. Modelling for factors associated with mortality and complications was undertaken using Cox proportional hazards and multivariable regression modelling. Results NASBO included 2341 patients, of whom 415 (17·7 per cent) had SBO due to hernia. Surgery was performed in 312 (75·2 per cent) of the 415 patients; small bowel resection was required in 198 (63·5 per cent) of these operations. Non‐operative management was reported in 35 (54 per cent) of 65 patients with a parastomal hernia and in 34 (32·1 per cent) of 106 patients with an incisional hernia. The in‐hospital mortality rate was 9·4 per cent (39 of 415), and was highest in patients with a groin hernia (11·1 per cent, 17 of 153). Complications were common, including lower respiratory tract infection in 16·3 per cent of patients with a groin hernia. Increased age was associated with an increased risk of death (hazard ratio 1·05, 95 per cent c.i. 1·01 to 1·10; P = 0·009) and complications (odds ratio 1·05, 95 per cent c.i. 1·02 to 1·09; P = 0·001). Conclusion NASBO has highlighted poor outcomes for patients with SBO due to hernia, highlighting the need for quality improvement initiatives in this group., This study shows that small bowel obstruction due to abdominal wall hernia is common, typically involves a co‐morbid group of patients and has poor outcomes, including high mortality rates. High mortality from this problem

Published
2020

16. Assessing the cardiology community position on transradial intervention and the use of bivalirudin in patients with acute coronary syndrome undergoing invasive management: results of an EAPCI survey

Author

Adamo, Marianna, Byrne, Robert A., Baumbach, Andreas, Haude, Michael, Windecker, Stephan, Valgimigli, Marco, Aaroe, J., Abdeltawab, A. A., Accardi, R., Addad, F., Agostoni, P., Alajab, A., Alcázar, E., Alhabil, B., Altug Cakmak, H., Amico, F., Amoroso, G., Anderson, R., Andò, G., Andreou, A. Y., Antoniadis, D., Aquilina, M., Aramberry, L., Auer, J., Auffret, V., Ausiello, A., Austin, D., Avram, A., Ayman, E., Babunashvili, V., Bagur, R., Bakotic, Z., Balducelli, M., Ballesteros, S. M., Baptista, S., Baranauskas, A., Barbeau, G., Bax, M., Benchimol, C., Berroth, R., Biasco, L., Bilal, A., Binias, K., Blanco Mata, R., Boccuzzi, G., Bolognese, L., Boskovic, S., Bourboulis, N., Briguori, C., Bunc, M., Buysschaert, I., Calabro’, P., Campo, G., Candiello, A., Caprotta, U. F., Cardenas, M., Carrilho-Ferreira, P., Carrizo, S., Caruso, M., Cassar, A., Cernigliaro, C., Chacko, G., Chamie, D., Clapp, B., Coceani, M., Colangelo, S., Colombo, A., Comeglio, M., Connaughton, M., Conway, D., Cortese, B., Cosgrave, J., Costa, F., Couvoussis, E., Crimi, G., Crook, R., Cruz-Alvarado, J. E., Curello, S., D’Ascenzo, F., D’Urbano, M., Dana, A., De Backer, O., De Carlo, M., De Cesare, N., De Iaco, G., De La Torre, H. J. M., De Oliveira Netoj, B., Devlin, G. P., Di Lorenzo, E., Díaz, A., Dina, C., Dorsel, T. H., Eberli, F. R., Echeverría, R., Eftychiou, C., Elguindy, A., Ercilla, J., Ernst, A., Esposito, G., Ettori, F., Eufracino, Null, Ezquerra Aguilera, W., Falcone, C., Falu, R. M., Feres, F., Ferlini, M., Fernández, G., Fernández-Rodríguez, D., Fileti, L., Fischetti, D., Florescu, N., Formigli, D., Fouladvand, F., Franco, N., Fresco, C., Frigoli, E., Furmaniuk, J., Gabaldo, K., Galli, M., Galli, S., Garbo, R., Garducci, S., Garg, S., Gavrielatos, G., Gensch, J., Giacchi, G., Giunio, L., Giustino, G., Goldberg, L., Goldsmit, R., Gommeaux, A., González Godínez, H., Gosselin, G., Govorov, A., Grimfjard, P., Gross, E., Grosz, C., Guagliumi, G., Hadad, W., Hadadi, L., Hansen, P. R., Harb, S., Hatrick, R., Hayrapetyan, H. G., Hernández-Enríquez, M., Ho Heo, J., Horvath, I. G., Huan Loh, P., Ibrahim, A. M., Ierna, S., Ilic, I., Imperadore, F., Ionescu-Silva, E., Jacksch, R., James, S., Janiak, B., Jensen, S. E., Jeroen, S., Jugessur, R. K., Kala, P., Kambis, M., Kanakakis, J., Karamasis, G., Karchevsky, D., Karpovskiy, A., Kayaert, P., Kedev, S., Kemala, E., Ketteler, T., Khan, S. Q., Kharlamov, A., Kiernan, T., Kiviniem, T., Koltowski, L., Koskinas, K. C., Kouloumpinis, A., Kraaijeveld, A. O., Krizanic, F., Krötz, B., Kuczmik, W., Kukreja, N., Kuksa, D., Yav, K., Kyriakos, D., Labrunie, A., Laine, M., Lapin, O., Larosa, C., Latib, A., Lattuca, B., Lauer, B., Lefèvre, T., Legrand, V., Lehto, P., Leiva-Pons, J. L., Leone, A. M., Lev, G., Lim, R., Limbruno, U., Linares Vicente, J. A., Lindsay, S., Linnartz, C., Liso, A., Lluberas, R., Locuratolo, N., Lokshyn, S., Lunde, K., Lupi, A., Magnavacchi, P., Maia, F., Mainar, V., Mancone, M., Manolios, M. G., Mansour, S., Mariano, E., Marques, K., Martins, H., Mckenzie, D., Meco, S., Meemook, K., Mehmed, K., Melikyan, A., Mellwig, K. P., Mendiz, O. A., Merkulov, E., Mesquita, H. G., Mezzapelle, G., Miloradovic, V., Mohamed, S., Mohammed, B., Mohammed, F., Mohammed, K., Mohanad, A., Morawiec, B., More, R., Moreno-Martínez, F. L., Mrevlje, B., Muhammad, F., Näveri, H., Nazzaro, M. S., Neary, P., Negus, B. H., Nelson Durval, F. G., Nick, H., Nilva, E., Oldroyd, K. G., Olivares Asencio, C., Omerovic, E., Ortiz, M. A., Ota, H., Otasevic, P., Otieno, H. A., Paizis, I., Papp, E., Pasquetto, G., Patsourakos, N. G., Peels, J., Pelliccia, F., Pennacchi, M., Penzo, C., Perez, P., Perkan, A., Petrou, E., Phipathananunth, W., Pierri, A., Pinheiro, L. F., Pipa, J. L., Piva, T., Polad, J., Porto, I., Poveda, J., Predescu, L., Prog, R., Puri, R., Raco, D. L., Ramazan, O., Ramazzotti, V., Rao, S. V., Raungaard, B., Reczuch, K., Rekik, S., Rhouati, A., Rigattieri, S., Rodríguez-Olivares, R., Roik, M., Romagnoli, E., Román, A. J., Routledge, H., Rubartelli, P., Rubboli, A., Ruiz-García, J., Russo, F., Ruzsa, Z., Ryding, A., Saad, Aly, Sabate, M., Sabouret, P., Sadowski, M., Saia, F., Sanchez Perez, I., Santoro, G. M., Sarenac, D., Saririan, M., Sarma, J., Schuetz, T., Sciahbasi, A., Sebastian, M., Sebik, R., Sesana, M., Hur, Seung-Ho, Sganzerla, P., Shalva, R., Sharma, S., Sheiban, I., Shein, K. K., Shiekh, I. A., Sinha, M., Slhessarenko, J., Smith, D., Smyth, D. W., Sönmez, K., Sood, N., Sourgounis, A., Srdanovic, I., Stables, R. H., Stefanini, G. G., Stewart, J., Stoyanov, N., Suliman, A. A., Suryadevara, R., Suwannasom, P., Tange Veien, K., Tauchert, S., Tebet, M., Testa, L., Thury, A., Tilsted, H. H., Tiroch, K., Torres, A., Tosi, P., Traboulsi, M., Trani, C., Tresoldi, S., Tsigkas, G., Tueller, D., Turri, M., Udovichenko, A. E., Uretsky, B., Van Der Harst, P., Van Houwelingen, K. G., Vandoni, P., Vandormael, M., Varbella, F., Venkitachalam, C. G., Vercellino, M., Vidal-Perez, R., Vigna, C., Vignali, L., Vogt, F., Voudris, V., Vranckx, P., Vrolix, M., Vydt, T., Webster, M., Wijns, W., Woody, W., Wykrzykowska, J., Yazdani, S., Yildiz, A., Yurlevich, D., Zauith, R., Zekanovic, D., Zhao, M., Zimarino, M., Zingarelli, A., Abdelsamad, A. Y., Abo Shaera, E. S., Afshar, M. S., Agatiello, C., Aguiar, P., Ahmad, A. M., Akin, I., Alameda, M., Alegría-Barrero, E., Alejos, R., Alkhashab, K., Alkutshan, R. S. A., Almorraweh, A., Altnji, I., Alvarez Iorio, C., Anchidin, O., Angel, J., Antonopoulos, A., Apshilava, G., Arana, C., Ashikaga, T., Assomull, R., Atef, S. Z., Azmus, A. D., Azzalini, L., Azzouz, A., Baglioni, P., Bampas, G., Basil, M. P., Baumbach, A., Besh, D., Bhushan Sharm, A., Bien Hsien, H., Bihui, L., Bing-Chen, L., Biryukov, S., Blatt, A., Bocchi, E., Boghdady, A., Bonarjee, V. V. S., Bosnjak, I., Bravo Baptista, S., Brinckman, S. L., Buchter, B., Burzotta, F., Cacucci, M., Cagliyan, C. E., Calabrò, P., Cernetti, C., Chávez Mizraym, R., Choo, W. S., Choudhury, R., Cicco, N., Cisneros Clavijo, P., Çitaku, H., Collet, J. P., Consuegra-Sánchez, L., Conte, M., Corral, J. M., Damonte, A., Dangoisse, V., Dastani, M., Della Rosa, F., Deora, S., Devadathan, S., Dharma, S., Di Giorgio, A., Diez, J. L., Dinesha, B., Duplančić, D., El Behwashi, M. F., Elghawaby, H., Elshahawy, O., Eskola, M. 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B., Quang Hung, D., Rada, I., Rafizadeh, O., Rahman, M. A., Rai, L., Ramsewak, A., Ravindran, R., Rodriguez De Leiras, O. S., Rodriguez Esteban, M., Roque Figueira, H., Saket, A., Sakhov, O., Saktheeswaran, M. K., Salachas, A., Sallam, A., Sampaolesi, A., Samy, A., Sanchis, J., Santaera, O., Santarelli, A., Santharaj, W. S., Sarango, B., Satheesh, S., Schmitz, T., Schuhlen, H., Seewoosagur, R., Segev, A., Seisembekov, V., Semitko, S., Sengottuvelu, G., Sepulveda Varela, P., Sethi, A., Sharma, A., Sharma, R. K., Shi, Hy., Simsek, M. A., Siqueira, B., Skalidis, E., Slawin, J., Sorokhtey, L., Spaulding, C., Srinivas, B., Srinivasan, M., Stakos, D., Stojkovic, S., Tacoy, G., Tawade, M., Tiecco, F., Tondi, S., Torresani, E. M., Tousek, P., Tran, T., Trantalis, G., Triantafyllou, K., Trivedi, R., Trivisonno, A., Tsui, K. L., Turkoglu, C., Tzung-Dau, W., Ueno, H., Urban, U., Uretsky, B. F., Uscumlic, A., Venugopal, V., Verney, R., Vilar, J. V., Villacorta, V. G., Vishwanath, R., Vlachojannis, G. J., Vlachojannis, M., Vlad, V., Von Birgelen, C., Vukcevic, V., Wahab, A., Waksman, R., Wei-Wen, L., Weisz, G., Whittaker, A., Yadav, A., Yokoi, Y., Zacharoulis, A., Zahran, M., Zamani, J., Ziakas, A., Zimmermann, J. P., and Cardiology

Subjects
Hirudin, Percutaneous, Antithrombin, medicine.medical_treatment, Psychological intervention, 030204 cardiovascular system & hematology, medical, 0302 clinical medicine, Peptide Fragment, Surveys and Questionnaires, Surveys and Questionnaire, Medicine, Bivalirudin, 030212 general & internal medicine, Societies, Medical, Transradial, Anticoagulant, Hirudins, Middle Aged, Recombinant Protein, Recombinant Proteins, Femoral Artery, Radial Artery, Cardiology, acute coronary syndrome, bivalirudin, transradial, adult, antithrombins, cardiology, femoral artery, hirudins, humans, middle aged, peptide fragments, percutaneous coronary intervention, recombinant proteins, societies, medical, surveys and questionnaires, attitude of health personnel, radial artery, Acute coronary syndrome, Cardiology and Cardiovascular Medicine, Human, medicine.drug, Adult, medicine.medical_specialty, Attitude of Health Personnel, medicine.drug_class, MEDLINE, Antithrombins, 03 medical and health sciences, societies, Percutaneous Coronary Intervention, Internal medicine, Humans, Acute Coronary Syndrome, Peptide Fragments, Management of acute coronary syndrome, business.industry, Percutaneous coronary intervention, medicine.disease, business
Abstract

AIMS Our aim was to report on a survey initiated by the European Association of Percutaneous Cardiovascular Interventions (EAPCI) collecting the opinion of the cardiology community on the invasive management of acute coronary syndrome (ACS), before and after the MATRIX trial presentation at the American College of Cardiology (ACC) 2015 Scientific Sessions. METHODS AND RESULTS A web-based survey was distributed to all individuals registered on the EuroIntervention mailing list (n=15,200). A total of 572 and 763 physicians responded to the pre- and post-ACC survey, respectively. The radial approach emerged as the preferable access site for ACS patients undergoing invasive management with roughly every other responder interpreting the evidence for mortality benefit as definitive and calling for a guidelines upgrade to class I. The most frequently preferred anticoagulant in ACS patients remains unfractionated heparin (UFH), due to higher costs and greater perceived thrombotic risks associated with bivalirudin. However, more than a quarter of participants declared the use of bivalirudin would increase after MATRIX. CONCLUSIONS The MATRIX trial reinforced the evidence for a causal association between bleeding and mortality and triggered consensus on the superiority of the radial versus femoral approach. The belief that bivalirudin mitigates bleeding risk is common, but UFH still remains the preferred anticoagulant based on lower costs and thrombotic risks.

Published
2016
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20. Local elites and national politics in Ghana : a case study of political centralization and local politics in Offinso, Ashanti (1945-1966)

Author

Crook, R. C.

Subjects
320.96670904
Abstract

Since the mid-1960s a considerable literature, both theoretical and empirical, has developed which accepts the idea that the politics of modern African states can be better understood through an examination of localcentral relations, viewed from the local perspective. Few empirical studies, however, have been published which examine in any detail the processes and structures linking local and central politics. The present study deals with this theme in Ghana between 1945 and 1966, examining the changing relationship of local elites to regional and national elites, and focusing particularly on changing institutional structures. It is contended that the concepts of elite, class and formal organization are more appropriate to such a task than those of 'political brokerage' or the 'clientelist state'. The 1945 to 1958 period is concerned mainly with the struggle of the colonial Native Authority elite for the preservation of its own position and of the integrity of the local institutions upon which it depended. In the process of developing extra-local alliances the local struggle becomes subsumed into the action of an emergent class and the national schism between the parties of 'localism' and 'centralism'. Between 1959 and 1966 the focus shifts to the study of the processes through which the dominant CPP both achieves centralization and absorbs all other political institutions except the civil service. Major new evidence is brought to bear on the development of the CPP bureaucracy and the government field administration in this period. It is concluded that the CPP did build a large and relatively effective apparat linking centre and locality, albeit one with many parallel hierarchies and a peculiarly unscrupulous organizational morality. The kind of centralization and bureaucratic expansion achieved reflected not just a centrally-initiated policy but was reciprocally shaped by the local and regional elites who helped to build the Party. Hence the CPP did not destroy local political life but integrated it into a nationally-articulated hierarchy.

Published
1978

22. National prospective cohort study of the burden of acute small bowel obstruction

Author

Lee, M. J., Sayers, A. E., Drake, T. M., Marriott, P. J., Anderson, I. D., Bach, S. P., Bradburn, M., Hind, D., Verjee, A., Fearnhead, N. S., Abercrombie, John, Acheson, Austin, Alderson, Derek, Anderson, Iain, Davies, Michael, Hamady, Zaed, Hollyman, Marianne, Hare, Sarah, Lee, Ellen, Northover, John, Lewis, Christopher, McFall, Malcolm, Murugananthan, Aravinth, Murray, David, Singh, Pritam, Tierney, Gillian, Walsh, Ciaran, Wild, Jonathan, Wilson, Timothy, Abbott, S, Abdulaal, Y, Afshar, S, Ah‐Chuen, J, Ahmed, T, Akhtar, M, Akram, F, Aldred, E, Ali, A, Aly, M, Amajuoyi, A, Amin, V, Anderson, D, Anderson, O, Andreou, A, Ansari, A, Appleton, S, Ardley, R, Arshad, F, Ashour, O, Asour, A, Athem, A, Athersmith, M, Ayoub, F, Azeem, H, Azhar, B, Badenoch, T, Baillie, C, Bandyopadhyay, D, Barker, J, Barker, S, Barkham, B, Baron, R, Barrie, J, Barry‐Yarrow, E, Bashir, G, Battersby, N, Bazoua, G, Behar, N, Bellam, S, Berger, C, Bhandari, S, Bhasin, S, Biggs, S, Bisset, C, Blake, L, Blencowe, N, Boam, T, Boddy, A, Boereboom, C, Bogdan, M, Bogle, R, Bohra, P, Boland, M, Bolkan, H, Borg, C, Boulton, R, Bouras, G, Boyer, M, Boyle, J, Branagan, G, Brewer, H, Briggs, C, Broadhurst, J, Brown, E, Brown, J, Brown, L, Brown, O, Burns, K, Butcher, K, Butler, M, Byrne, B, Campbell, L, Capper, C, Cartmell, M, Cash, T, Chan, S, Chandratreya, N, Chapman, J, Chapman, S, Charalabopoulos, A, Cheek, C, Chok, S, Choong, W, Chow, M, Chowdhury, J, Coe, P, Conaghan, P, Conn, G, Cook, N, Cook, T, Cooper, S, Cornish, J, Cotton, D, Cox, C, Coyne, P, Crook, R, Crozier, J, Cuffolo, G, Cunha, P, Curtis, N, Cutting, J, Da Costa, K, Silva, L, Das, B, Davenport, M, Davies, J, Davies, T, Day, A, Dayal, S, Dean, S, Demetriou, G, Dengu, F, Dennis, R, Dent, H, Dent, P, Deputy, M, Devoto, L, Di Benedetto, G, Dindyal, S, Donnelly, E, Doody, P, Douka, E, Downham, C, Dowson, H, Edent, H, Edgerton, K, Ekpete, N, El Farran, M, Elamin, O, Eljaafari, M, Elsaid, N, El‐Sharif, M, Evans, J, Evans, M, Ewe, R, Ewing, A, Exarchou, K, Fallaize, R, Faoury, M, Farag, S, Farinella, E, Faulkner, G, Ferguson, H, Fisher, O, Fletcher, J, Forouzanfar, A, Foster, A, Fox, R, Francis, N, Fretwell, V, Fung, D, Gammeri, E, Garnham, J, Geraghty, A, Gilbert, A, Gill, C, Gill, M, Gillespie, M, Giordano, P, Glasbey, J, Goh, M, Golder, A, Green, N, Gregoir, T, Grey, T, Groundwater, E, Grove, T, Growcott, S, Gunasekaran, S, Habib, H, Haddow, J, Halahakoon, V, Halkias, C, Hall, C, Hampson, A, Hancock, L, Hanna, T, Hannay, J, Harikrishnan, A, Harries, R, Harris, G, Hartley, J, Harvey, K, Hawkin, P, Hawkins, J, Healy, R, Heard, R, Heartshorne, R, Heller, S, Hendra, L, Herrod, P, Heywood, N, Hicks, G, Hobson, B, Holtham, S, Hope, C, Hopley, P, Hossain, T, Hossaini, S, Howse, F, Hubbard, T, Humphreys, A, Ikram, H, Ioannis, M, Iqbal, M, Iqbal, N, Jain, R, Jatania, J, Jenkinson, P, Jokhan, S, Jones, A, Jones, C, Jones, L, Joshi, H, Joshi, K, Joy, M, Jull, P, Kakaniaris, G, Kallam, R, Kane, E, Kang, P, Kanitkar, R, Kauser, S, Kazmi, F, Kedrzycki, M, Kelly, S, Kendall, J, Khan, M, Khan, T, King, G, Kisiel, A, Kitsis, C, Kolawole, I, Korambayil, S, Kosasih, S, Kosti, A, Kotb, A, Kouris, S, Kshatriya, K, Kumar, S, Lafaurie, G, Lal, R, Lau, A, Lazim, T, Lazzaro, A, Lee, K, Lefroy, R, Leinhardt, D, Lennon, H, Leong, K, Levy, B, Lim, E, Lim, J, Lindley, S, Liu, D, Lloyd, P, Locker, D, Lockwood, S, Lowe, C, Lund, J, Lunevicius, R, Lunt, A, Lutfi, S, Luther, A, Luwemba, S, Mahankali‐Rao, P, Mahroof, S, Mai, D, Majid, S, Malik, A, Malik, K, Mann, K, Mansour, S, Manu, N, Mapara, R, Martin, C, Martin, J, Martin, R, Mason, C, Massey, L, Mathias, J, Mathur, P, Maude, K, McArthur, D, McCain, S, McCluney, S, McIlroy, B, McKay, S, McKinley, N, McNair, A, McWhirter, D, Mekhail, P, Mellor, K, Merchant, J, Merker, L, Messenger, D, Miles, A, Mir, S, Mishra, A, Mistry, P, Miu, V, Moat, M, Mockford, K, Mohamed, E, Mohamed, I, Mondragon‐Pritchard, M, Moore, N, Moretti, L, Morris, H, Morrison, T, Morrison‐Jones, V, Moss, J, Moug, S, Mountford, D, Moynihan, R, Muhammad, K, Muldoon‐Smith, D, Mulholland, J, Mullan, M, Murgitroyd, E, Murugaiyan, K, Myers, A, Mykoniatis, I, Nana, G, Nash, T, Nassar, A, Newton, R, Ng, C, Ng, P, Nguyen, K, Nicholas, F, Noor, M, Nowers, J, Nugent, C, Nunn, A, Nunn, R, Obeid, N, O'Callaghan, J, O'Hara, R, Oke, O, Olivier, J, O'Neill, A, O'Neill, S, Osei‐Bordom, D, Osgood, L, Panagiotopoulos, S, Panchasara, B, Parks, R, Patel, H, Patel, P, Patel, R, Patel, S, Pawelec, K, Payne, C, Pearson, K, Perin, G, Peristerakis, I, Petronio, B, Phelan, L, Phillips, J, Pisaneschi, C, Pitt, J, Plunkett‐Reed, K, Ponchietti, L, Pouzi, A, Pouzi, M, Powell, A, Powell‐Chandler, A, Pranesh, N, Proctor, V, Pywell, S, Qureshi, A, Qureshi, N, Rahman, M, Rai, Z, Ramcharan, S, Rangarajan, K, Rashid, M, Reader, H, Rehman, A, Rehman, S, Rengifo, C, Richards, E, Richardson, N, Robinson, A, Robinson, D, Rossi, B, Rutherford, F, Sadien, I, Saghir, T, Sahnan, K, Salahia, G, Sarveswaran, J, Saunders, M, Scott, B, Scott, K, Seager, A, Seal, S, Sezen, E, Shaban, F, Shah, P, Shahmohammadi, M, Shamsiddinova, A, Shankar, S, Sharpe, A, Shatkar, V, Sheel, A, Shields, T, Shinkwin, M, Shurmer, J, Siddika, A, Siddiqui, S, Simson, R, Sinclair, P, Singh, B, Singh, S, Sivaraj, J, Skaife, P, Skelly, B, Skinner, A, Slim, N, Smart, C, Smart, N, Smith, F, Smith, I, Smith, R, Spence, G, Sreedhar, A, Steinke, J, Stevenson, L, Stewart‐Parker, E, Stott, M, Stubbs, B, Stylianides, N, Subramonia, S, Swinkin, M, Swinscoe, M, Symons, N, Tahir, W, Taj, T, Takacs, K, Tam, J, Tan, K, Tani, S, Tanner, N, Tao, D, Taylor, M, Thava, B, Thippeswamy, K, Thomas, C, Thompson, E, Thompson, R, Thompson‐Reil, C, Thorn, C, Tongo, F, Toth, G, Turnbull, A, Turnbull, J, Valero, C, Boxel, G, Varcada, M, Venn, M, Ventham, N, Venza, M, Vimalachandran, D, Virlos, I, Wade, T, Wafi, A, Waite, K, Walker, M, Walker, N, Walker, T, Walsh, U, Wardle, S, Warner, R, Watfah, J, Watson, N, Watt, J, Watts, J, Wayman, J, Weegenaar, C, West, H, West, M, Whitehurst, L, Whyler, M, Wiggans, M, Wijeyekoon, S, Williams, G, Williams, R, Williamson, A, Williamson, J, Wilson, J, Winter, A, Wolpert, L, Wong, J, Yeap, E, Yeong, T, Zaman, S, Zappa, B, Zosimas, D, Moug S Mondragon‐Pritchard, M, Rehan, S, and van Boxel, G

Abstract

Background: \ud Small bowel obstruction is a common surgical emergency, and is associated with high levels of morbidity and mortality across the world. The literature provides little information on the conservatively managed group. The aim of this study was to describe the burden of small bowel obstruction in the UK.\ud \ud Methods: \ud This prospective cohort study was conducted in 131 acute hospitals in the UK between January and April 2017, delivered by trainee research collaboratives. Adult patients with a diagnosis of mechanical small bowel obstruction were included. The primary outcome was in‐hospital mortality. Secondary outcomes included complications, unplanned intensive care admission and readmission within 30 days of discharge. Practice measures, including use of radiological investigations, water soluble contrast, operative and nutritional interventions, were collected.\ud \ud Results: \ud Of 2341 patients identified, 693 (29·6 per cent) underwent immediate surgery (within 24 h of admission), 500 (21·4 per cent) had delayed surgery after initial conservative management, and 1148 (49·0 per cent) were managed non‐operatively. The mortality rate was 6·6 per cent (6·4 per cent for non‐operative management, 6·8 per cent for immediate surgery, 6·8 per cent for delayed surgery; P = 0·911). The major complication rate was 14·4 per cent overall, affecting 19·0 per cent in the immediate surgery, 23·6 per cent in the delayed surgery and 7·7 per cent in the non‐operative management groups (P < 0·001). Cox regression found hernia or malignant aetiology and malnutrition to be associated with higher rates of death. Malignant aetiology, operative intervention, acute kidney injury and malnutrition were associated with increased risk of major complication.\ud \ud Conclusion: \ud Small bowel obstruction represents a significant healthcare burden. Patient‐level factors such as timing of surgery, acute kidney injury and nutritional status are factors that might be modified to improve outcomes.

Published
2019

25. Outcomes following small bowel obstruction due to malignancy in the national audit of small bowel obstruction

Author

Drake, Thomas M., primary, Lee, Matthew J., additional, Sayers, Adele E., additional, Abercrombie, John, additional, Acheson, Austin, additional, Alderson, Derek, additional, Anderson, Iain, additional, Bradburn, Mike, additional, Davies, Michael, additional, Hamady, Zaed, additional, Hind, Daniel, additional, Hollyman, Marianne, additional, Hare, Sarah, additional, Lee, Ellen, additional, Northover, John, additional, Lewis, Christopher, additional, Marriott, Paul J., additional, Maynard, Nick, additional, McFall, Malcolm, additional, Muragananthan, Aravinth, additional, Murray, David, additional, Singh, Pritam, additional, Tierney, Gillian, additional, Verjee, Azmina, additional, Walsh, Ciaran, additional, Wild, Jonathan RL., additional, Wilson, Timothy, additional, Abbott, S., additional, Abdulaal, Y., additional, Afshar, S., additional, Akhtar, M., additional, Anderson, D., additional, Appleton, S., additional, Bandyopadhyay, D., additional, Bashir, G., additional, Behar, N., additional, Bhandari, S., additional, Branagan, G., additional, Boulton, R., additional, Borg, C., additional, Bouras, G., additional, Boyle, J., additional, Brewer, H., additional, Brown, L., additional, Briggs, C., additional, Cartmell, M., additional, Chan, S., additional, Chandratreya, N., additional, Conaghan, P., additional, Cornish, J., additional, Cotton, D., additional, Coyne, P., additional, Crozier, J., additional, Cook, T., additional, Cunha, P., additional, Curtis, N., additional, Day, A., additional, Dayal, S., additional, Dennis, R., additional, Dent, P., additional, Dowson, H., additional, Fallaize, R., additional, Farag, S., additional, El Farran, M., additional, Faulkner, G., additional, Giordano, P., additional, Grey, T., additional, Halahakoon, V., additional, Hannay, J., additional, Harikrishnan, A., additional, Holtham, S., additional, Hawkin, P., additional, Hall, C., additional, Hancock, L., additional, Hartley, J., additional, Howse, F., additional, Kallam, R., additional, Kakaniaris, G., additional, Kelly, S., additional, Lockwood, S., additional, Leinhardt, D., additional, Levy, B., additional, Lal, R., additional, Lazim, T., additional, Lund, J., additional, Lunevicius, R., additional, Mathur, P., additional, Maude, K., additional, McArthur, D., additional, McIlroy, B., additional, Miles, A., additional, Moug, S., additional, Mondragon-Pritchard, M., additional, Messenger, D., additional, Mullan, M., additional, Myers, A., additional, Muhammad, K., additional, Mason, C., additional, Sarveswaran, J., additional, Shatkar, V., additional, Singh, B., additional, Skelly, B., additional, Subramonia, S., additional, Swinscoe, M., additional, Thava, B., additional, Thorn, C., additional, Panagiotopoulos, S., additional, Patel, P., additional, Phillips, J., additional, Peristerakis, I., additional, Qureshi, A., additional, Saunders, M., additional, Shah, P., additional, Sheel, A., additional, Siddiqui, S., additional, Skaife, P., additional, Smart, N., additional, Smith, I., additional, Stevenson, L., additional, Stylianides, N., additional, Steinke, J., additional, Stubbs, B., additional, Thompson, R., additional, Varcada, M., additional, Vimalachandran, D., additional, Virlos, I., additional, Watfah, J., additional, Watson, N., additional, Walker, M., additional, Ventham, N., additional, West, H., additional, Wilson, J., additional, Wijeyekoon, S., additional, Ah-Chuen, J., additional, Ahmed, T., additional, Akram, F., additional, Aldred, E., additional, Ali, A., additional, Aly, M., additional, Amajuoyi, A., additional, Amin, V., additional, Andreou, A., additional, Ansari, A., additional, Ardley, R., additional, Arshad, F., additional, Ashour, O., additional, Asour, A., additional, Ayoub, F., additional, Azeem, H., additional, Azhar, B., additional, Baillie, C., additional, Barker, J., additional, Barkham, B., additional, Baron, R., additional, Barrie, J., additional, Barry-Yarrow, E., additional, Battersby, N., additional, Bazoua, G., additional, Berger, C., additional, Bhasin, S., additional, Biggs, S., additional, Bisset, C., additional, Blencowe, N., additional, Boddy, A., additional, Boereboom, C., additional, Bogdan, M., additional, Bogle, R., additional, Bohra, P., additional, Bolkan, H., additional, Boyer, M., additional, Broadhurst, J., additional, Brown, E., additional, Brown, J., additional, Burns, K., additional, Butcher, K., additional, Capper, C., additional, Cash, T., additional, Chapman, J., additional, Chapman, S., additional, Charalabopoulos, A., additional, Cheek, C., additional, Chok, S., additional, Choong, W., additional, Chowdhury, J., additional, Coe, P., additional, Conn, G., additional, Cook, N., additional, Cooper, S., additional, Cox, C., additional, Crook, R., additional, Cuffolo, G., additional, da Silva, L., additional, Das, B., additional, Davenport, M., additional, Davies, J., additional, Davies, T., additional, Dean, S., additional, Demetriou, G., additional, Dengu, F., additional, Dent, H., additional, Di Benedetto, G., additional, Dindyal, S., additional, Donnelly, E., additional, Douka, E., additional, Downham, C., additional, Edent, H., additional, Edgerton, K., additional, El-Sharif, M., additional, Elamin, O., additional, Elsaid, N., additional, Evans, J., additional, Evans, M., additional, Ewe, R., additional, Ewing, A., additional, Ferguson, H., additional, Fisher, O., additional, Fletcher, J., additional, Forouzanfar, A., additional, Foster, A., additional, Fox, R., additional, Francis, N., additional, Fretwell, V., additional, Fung, D., additional, Gammeri, E., additional, Garnham, J., additional, Geraghty, A., additional, Gilbert, A., additional, Gill, M., additional, Gillespie, M., additional, Glasbey, J., additional, Golder, A., additional, Green, N., additional, Groundwater, E., additional, Grove, T., additional, Habib, H., additional, Haddow, J., additional, Halkias, C., additional, Hampson, A., additional, Hanna, T., additional, Harries, R., additional, Harvey, K., additional, Hawkins, J., additional, Healy, R., additional, Heartshorne, R., additional, Heller, S., additional, Hendra, L., additional, Herrod, P., additional, Heywood, N., additional, Hicks, G., additional, Ng, P., additional, Hope, C., additional, Hopley, P., additional, Hossain, T., additional, Hossaini, S., additional, Hubbard, T., additional, Humphreys, A., additional, Ikram, H., additional, Ioannis, M., additional, Iqbal, M., additional, Jatania, J., additional, Jenkinson, P., additional, Jokhan, S., additional, Jones, A., additional, Jones, C., additional, Jones, L., additional, Joshi, H., additional, Joshi, K., additional, Joy, M., additional, Jull, P., additional, Kane, E., additional, Kanitkar, R., additional, Kauser, S., additional, Kazmi, F., additional, Kedrzycki, M., additional, Kendall, J., additional, Khan, T., additional, King, G., additional, Kisiel, A., additional, Kitsis, C., additional, Kolawole, I., additional, Kosasih, S., additional, Kosti, A., additional, Kotb, A., additional, Lau, A., additional, Lafaurie, G., additional, Lazzaro, A., additional, Lefroy, R., additional, Lennon, H., additional, Leong, K., additional, Lim, E., additional, Lim, J., additional, Lindley, S., additional, Liu, D., additional, Lloyd, P., additional, Locker, D., additional, Lowe, C., additional, Lunt, A., additional, Lutfi, S., additional, Luther, A., additional, Luwemba, S., additional, Mahankali-Rao, P., additional, Mai, D., additional, Majid, S., additional, Malik, A., additional, Manu, N., additional, Mapara, R., additional, Martin, C., additional, Martin, J., additional, Massey, L., additional, Mathias, J., additional, McCain, S., additional, McCluney, S., additional, McNair, A., additional, Mekhail, P., additional, Merchant, J., additional, Merker, L., additional, Mir, S., additional, Mistry, P., additional, Miu, V., additional, Moat, M., additional, Mohamed, E., additional, Mohamed, I., additional, Moore, N., additional, Moretti, L., additional, Morris, H., additional, Morrison, T., additional, Moss, J., additional, Mountford, D., additional, Moynihan, R., additional, Muldoon-Smith, D., additional, Mulholland, J., additional, Murgitroyd, E., additional, Murugaiyan, K., additional, Mykoniatis, I., additional, Nana, G., additional, Nash, T., additional, Nassar, A., additional, Newton, R., additional, Nguyen, K., additional, Nicholas, F., additional, Noor, M., additional, Nowers, J., additional, Nugent, C., additional, Nunn, A., additional, O'Callaghan, J., additional, O'Hara, R., additional, O'Neill, A., additional, Olivier, J., additional, Osei-Bordom, D., additional, Osgood, L., additional, Panchasara, B., additional, Parks, R., additional, Patel, H., additional, Pawelec, K., additional, Payne, C., additional, Pearson, K., additional, Perin, G., additional, Petronio, B., additional, Phelan, L., additional, Pisaneschi, C., additional, Pitt, J., additional, Ponchietti, L., additional, Powell, A., additional, Powell-Chandler, A., additional, Pranesh, N., additional, Proctor, V., additional, Qureshi, N., additional, Rahman, M., additional, Rai, Z., additional, Ramcharan, S., additional, Rangarajan, K., additional, Rashid, M., additional, Reader, H., additional, Rehman, A., additional, Rehan, S., additional, Rengifo, C., additional, Richardson, N., additional, Robinson, A., additional, Robinson, D., additional, Rossi, B., additional, Rutherford, F., additional, Sadien, I., additional, Saghir, T., additional, Sahnan, K., additional, Salahia, G., additional, Scott, B., additional, Scott, K., additional, Seager, A., additional, Seal, S., additional, Sezen, E., additional, Shaban, F., additional, Shahmohammadi, M., additional, Shamsiddinova, A., additional, Shankar, S., additional, Sharpe, A., additional, Shields, T., additional, Shinkwin, M., additional, Shurmer, J., additional, Siddika, A., additional, Simson, R., additional, Singh, S., additional, Sivaraj, J., additional, Skinner, A., additional, Smart, C., additional, Smith, F., additional, Smith, R., additional, Sreedhar, A., additional, Stewart-Parker, E., additional, Stott, M., additional, Symons, N., additional, Taj, T., additional, Tam, J., additional, Tan, K., additional, Tani, S., additional, Tao, D., additional, Thippeswamy, K., additional, Thomas, C., additional, Thompson, E., additional, Thompson-Reil, C., additional, Tongo, F., additional, Toth, G., additional, Turnbull, A., additional, Turnbull, J., additional, Wade, T., additional, Wafi, A., additional, Waite, K., additional, Walker, N., additional, Walker, T., additional, Walsh, U., additional, Wardle, S., additional, Warner, R., additional, Watt, J., additional, Watts, J., additional, Wayman, J., additional, Weegenaar, C., additional, West, M., additional, Whyler, M., additional, Whitehurst, L., additional, Wiggans, M., additional, Williams, G., additional, Williams, R., additional, Williamson, A., additional, Williamson, J., additional, Winter, A., additional, Wolpert, L., additional, Wong, J., additional, van Boxel, G., additional, Yeap, E., additional, Zaman, S., additional, Zappa, B., additional, Zosimas, D., additional, Anderson, O., additional, Athem, A., additional, Athersmith, M., additional, Badenoch, T., additional, Barker, S., additional, Bellam, S., additional, Boam, T., additional, Boland, M., additional, Blake, L., additional, Brown, O., additional, Butler, M., additional, Byrne, B., additional, Campbell, L., additional, Chow, M., additional, Da Costa, K., additional, Cutting, J., additional, Deputy, M., additional, Devoto, L., additional, Doody, P., additional, Ekpete, N., additional, Eljaafari, M., additional, Exarchou, K., additional, Faoury, M., additional, Farinella, E., additional, Gill, C., additional, Goh, M., additional, Gregoir, T., additional, Growcott, S., additional, Gunasekaran, S., additional, Harris, G., additional, Heard, R., additional, Hobson, B., additional, Iqbal, N., additional, Jain, R., additional, Kang, P., additional, Khan, M., additional, Korambayil, S., additional, Kouris, S., additional, Kshatriya, K., additional, Kumar, S., additional, Lee, K., additional, Mahroof, S., additional, Malik, K., additional, Mann, K., additional, Mansour, S., additional, Martin, R., additional, McKay, S., additional, McKinley, N., additional, McWhirter, D., additional, Mellor, K., additional, Mishra, A., additional, Mockford, K., additional, Morrison-Jones, V., additional, Ng, C., additional, Nunn, R., additional, O'Neill, S., additional, Oke, O., additional, Obeid, N., additional, Patel, R., additional, Patel, S., additional, Plunkett-Reed, K., additional, Pouzi, M., additional, Pywell, S., additional, Richards, E., additional, Sinclair, P., additional, Slim, N., additional, Spence, G., additional, Swinkin, M., additional, Tahir, W., additional, Takacs, K., additional, Tanner, N., additional, Taylor, M., additional, Valero, C., additional, Venn, M., additional, Venza, M., additional, Yeong, T., additional, and Fearnhead, Nicola S., additional

Published
2019
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33. Free Volume in Glassy Poly(arylene Ether Ketone)s

Author

Hinkley, J. A, Eftekhari, A, Crook, R. A, Jensen, B. J, and Singh, J. J

Subjects
Nonmetallic Materials
Abstract

Amorphous polyarylene ether ketones were examined in the glassy state by positron annihilation lifetime spectroscopy ( PALS ) and in the melt by standard rheological techniques. Specimens were well-characterized fractions of two isomeric structures. PALS clearly shows that the polymer with meta linkages in its backbone contains larger voids (greater than 0.25 nm radius). Thus despite their similar bulk densities, the two materials must pack very differently on a local scale. On the other hand, the free volumes inferred from the WLF treatment of melt viscosity data are practically identical in both materials ca. 4% at T(sub g). The comparison between techniques sheds some light on the distribution of free volume.

Published
1996

35. Impacts of stratospheric sulfate geoengineering on global solar photovoltaic and concentrating solar power resource

Author

Smith, CJ, Crook, JA, Crook, R, Jackson, LS, Osprey, SM, and Forster, PM

Abstract

In recent years, the idea of geoengineering, artificially modifying the climate to reduce global temperatures, has received increasing attention due to the lack of progress in reducing global greenhouse gas emissions. Stratospheric sulfate injection (SSI) is a geoengineering method proposed to reduce planetary warming by reflecting a proportion of solar radiation back into space that would otherwise warm the surface and lower atmosphere. We analyze results from the HadGEM2-CCS climate model with stratospheric emissions of 10 Tg yr-1 of SO2, designed to offset global temperature rise by around 1°C. A reduction in concentrating solar power (CSP) output of 5.9% on average over land is shown under SSI compared to a baseline future climate change scenario (RCP4.5) due to a decrease in direct radiation. Solar photovoltaic (PV) energy is generally less affected as it can use diffuse radiation, which increases under SSI, at the expense of direct radiation. Our results from HadGEM2-CCS are compared to the GEOSCCM chemistry-climate model from the Geoengineering Model Intercomparison Project (GeoMIP), with 5 Tg yr-1 emission of SO2. In many regions, the differences predicted in solar energy output between the SSI and RCP4.5 simulations are robust, as the sign of the changes for both the HadGEM2-CCS and GEOSCCM models agree. Furthermore, the sign of the total and direct annual mean radiation changes evaluated by HadGEM2-CCS agree with the sign of the multi-model mean changes of an ensemble of GeoMIP models over the majority of the world.

Published
2017

36. The viscoelastic behavior of notched glassy polymers

Author

Crook, R. A and Letton, Alan

Subjects
Structural Mechanics
Abstract

In the bulk, glassy polymers exhibit a nonlinear viscoelastic response during deformation. Stress or strain induced damage (i.e. crazing, microshear banding) results in the production of nonrecoverable work and observed nonlinearity. Stress or strain dependent shift factors have been used to mathematically model the mechanical behavior of these polymers. Glassy polymers that have been notched, may exhibit very different load displacement response compared to the same material under bulk deformation. If a sharp notch is introduced into the body then loaded, the load displacement trace may appear to be single-valued in the absence of viscoelasticity and crack growth. This suggests the volume of damaged material is small compared to the overall dimensions of the specimen. The ability to produce a single-valued load-load-line displacement trace through the use of the Correspondence Principle may prove to be useful for fracture of viscoelastic materials.

Published
1993
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38. Characteristics of a micromachined floating-gate high-electron-mobility transistor at 4.2 K.

Author

Teh, W. H., Crook, R., Smith, C. G., Beere, H. E., and Ritchie, D. A.

Subjects
*FIELD-effect transistors, *TRANSISTORS, *ELECTRONICS, *NICKEL, *ELECTRON gas, *HETEROSTRUCTURES, *DETECTORS
Abstract

We use micromachined, free-standing Ni cantilevers to develop a mechanical field-effect transistor based on III-V material systems. The device consists of an electrostatically actuated microcantilever, acting as the floating gate, fabricated over a defined two-dimensional electron gas (2DEG) in a modulation-doped GaAs/AlGaAs heterostructure. The gating effects on the conductance of the 2DEG channel of the biased floating gate at different operating points are studied at 4.2 K. Preliminary resonance measurements based on the 2DEG as a deflection sensor are presented. [ABSTRACT FROM AUTHOR]

Published
2005
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39. Pertes d'énergie au niveau des regards et des avaloirs d’assainissement

Author

O'Loughlin, G., Crook, R., Kandasamy, J., University of Technology Sydney (UTS), and Brelot, Elodie

Subjects
[SDE.IE]Environmental Sciences/Environmental Engineering, networks, education, sediments, cardiovascular system, réseaux, cardiovascular diseases, sédiments
Abstract

Colloque avec actes et comité de lecture. internationale.; International audience; Pits in stormwater pipeline systems overflow in various circumstances, reversing the usual inflows. Energy losses for pits operating as outflows have been measured in a laboratory model pit with one inlet pipe and no outlet pipes. In addition to expansion and circulation losses in the pit, significant losses can occur at outlets where the ratio of the outlet opening area to the horizontal pit cross-section area is less than 25%. Loss coefficients related to the velocity head in the inlet pipe have been calculated for circular orifices, grates, kerb inlets and lifted manhole lids over a range of flowrates. These can be used to define the height of the energy grade line above the level of the opening, providing a boundary condition for pipe network calculations. The results are also applicable to manholes in sanitary sewer systems

Published
2016

40. ECMO/PPHN

Author

Pearson, G. A., Macrae, D., Merzel Y., Lev A., Bar Yosef G., Halbertal M., Lorber A., Sigston P. E., Goldman A. P., Keating J., Crook R., Macrae D. J., van den Anker, J. N., Schoemaker, R. C., Vogel, M., Goessens, W., Tibboel, D., Schindler M., Cutz E., Duffy B., Bryan A. C., and Steering Group

Published
1996
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41. A Survey Informed Modelling of Temporal Diffusion of PV-Based Communal Grids in a Rural Developing Community

Author

Opiyo, N., Taylor, P.G., and Crook, R.

Subjects
PV Economics, Markets and Policies, PV Global Issues, Policies and Strategies
Abstract

32nd European Photovoltaic Solar Energy Conference and Exhibition; 3055-3059, An agent-based model (ABM) is developed in Netlogo as a tool for evaluating temporal diffusion of PV-based communal grids in a rural developing community. ABMs model individual entities within a complex system and the rules that govern the interactions of the entities within the system, to capture the overall effect of such interactions. Results show that given various choices, small PV mircogeneration systems would emerge as the prefered source of electrification for many households. Also, with increasing power demands, many household would prefer communal grids to the national utility grid. Furthermore, introduction of favourable government policies in the form of subsidies and mircocredit facilities, coupled with increasing social acceptance, would lead to increased PV installations and correspondingly to increased communal grid connections. Specifically, introduction of a subsidy of $0.15/kWh would result in an increase of 249% in communal grid connections. Increasing the sensing radius from 1 km to 2 km would result in an increase of 118% in communal grid connections.

Published
2016
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44. The ExcaliburRX-3M X-Ray Photon Counting Area Detector for Coherent Diffraction Imaging at the I13 Beamline at Diamond Light Source

Author

Williams, S. J., primary, Batey, D., additional, Cipiccia, S., additional, Angelsen, C., additional, Crook, R., additional, Gimenez, E., additional, Horswell, I., additional, Marchal, J., additional, Nicholls, T., additional, Pedersen, U., additional, Taghavi, S., additional, Tartoni, N., additional, Rau, C., additional, Thompson, J., additional, and Willis, B., additional

Published
2017
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46. Solar Resource Estimation Using a Radiative Transfer with Shading (RTS) Model

Author

Gooding, J., Smith, C.J., Crook, R., and Tomlin, A.S.

Subjects
PV as Part of the Energy System, PV APPLICATIONS
Abstract

31st European Photovoltaic Solar Energy Conference and Exhibition; 2808-2813, A combination of falling technology prices and government financial incentives has led to the rapid expansion of the solar microgeneration industry in the UK and around the world. With conditions for investment becoming more favourable, viability appraisal is now of great interest to potential investors ranging from individuals to large companies and authorities. A methodology to predict solar resource available to solar technologies in urban areas is presented that combines a radiative transfer simulation with shading derived from digital surface model (DSM) data. The radiative transfer simulation includes water vapour, ozone, clouds and surface albedo determined from MODIS satellite products along with aerosol properties that are derived from the GLOMAP model. A DSM is used to calculate the height of near-by obstacles and the horizon from each point of interest to establish when the site is in shade during a year. The site-level radiance field is adjusted by elements in shade and integrated over the view hemisphere of the photovoltaic (PV) panels to take into account panel tilt. Modelled annual global radiation (Wh/m2/a) estimations are validated using power output data from 17 sites across four major UK cities (Bristol, Cambridge, Leeds and Sheffield) and show good agreement with -3.68% and +2.62% mean percentage error under assumed performance ratio conversions of 0.75 and 0.8 respectively. The results are compared to the outputs of both Esri ArcGIS and PVGIS, the first of which predicted annual global radiation with -15.97% and -20.78% mean percentage error with the latter returning +3.34% and +10.23% mean percentage error for the 0.75 and 0.8 performance ratios.

Published
2015
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47. Changes in Solar PV Output due to Water Vapour Loading in a Future Climate Scenario

Author

Smith, C.J., Crook, R., and Forster, P.M.

Subjects
OPERATIONS, PERFORMANCE AND RELIABILITY OF PHOTOVOLTAICS (FROM CELLS TO SYSTEMS), Operation of PV Systems and Plants
Abstract

31st European Photovoltaic Solar Energy Conference and Exhibition; 2110-2113, Under a future climate, it is shown that the total atmospheric water vapour will increase over present levels. Water vapour has several distinct absorption bands in the visible and near-infrared parts of the spectrum, which is critical for PV conversion. The sensitivity of current world-leading c-Si, thin film and perovskite solar cells to the solar spectrum under different water vapour loadings is investigated. Semiconductors with bandgaps above 1.4 eV are more resilient to increases in atmospheric water vapour due to the avoidance of two large absorption bands in the near-infrared. Global changes in atmospheric water vapour are then taken from the HadGEM2-ES climate model under the RCP8.5 scenario, and used to determine the changes in PV output for clear-sky conditions for crystalline silicon (c-Si) and amorphous silicon (a-Si) solar cells. For some regions of the world, a decrease in power output of up to 3% for clear-sky conditions is seen for the spectral response of the current world-leading c-Si cell due to increasing water vapour, whereas a-Si performs better with a global power output decline of less than 1%.

Published
2015
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48. Laseraltimetrie veelbelovend voor meten waterbodemhoogte in sloten

Author

Hennepe, E. ter, Harren, L., Velden, R. van der, Crook, R. de, Batlle Vazquez, D., Hennepe, E. ter, Harren, L., Velden, R. van der, Crook, R. de, and Batlle Vazquez, D.

Abstract

Er is behoefte aan een meetmethode van de waterbodemhoogte die nauwkeurig, arbeidsextensief en gebiedsdekkend is. De techniek is er voor mariene doeleinden, maar werkt deze ook voor smalle en ondiepe sloten in veenweide- of kleigebieden? Waternet heeft in 2015 een pilot laten uitvoeren in veenweidegebied. Dit heeft meer inzicht opgeleverd in de invloedsfactoren, maar de omstandigheden in veenweidegebied blijken lastig. Er is vervolgonderzoek nodig om de meetmethode te verbeteren en naar hetzelfde bruikbaarheidsniveau te brengen als de infrarode laseraltimetrie voor het AHN. Het onderzoek richt zich op mogelijke verbetering van de groene laser en de ontwikkeling van een gele laser.

Published
2016

49. Hoe geschikt zijn lasers om de diepte van sloten te bepalen?

Author

Hennepe, E. ter, Harren, L., Velden, R. van der, Crook, R. de, Batlle Vazquez, D., Hennepe, E. ter, Harren, L., Velden, R. van der, Crook, R. de, and Batlle Vazquez, D.

Abstract

Het is voor waterschappen nuttig om te weten hoe diep sloten zijn. Traditionele meetmethoden zijn echter arbeidsintensief en duur. Is laseraltimetrie een geschikte optie? Die meetmethode met lasers is gangbaar voor het meten van de hoogte van het land (maaiveld) of de diepte van ondiepe zeeën. De pilot die Waternet samen met hoogheemraadschap De Stichtse Rijnlanden uitvoerde, leverde veel informatie op.

Published
2016

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