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3,516 results on '"Rees, David"'

14. On dynamical ordering in a 2D electron crystal confined in a narrow channel geometry

Author

Zou, Shan, Rees, David G., and Konstantinov, Denis

Subjects
Condensed Matter - Strongly Correlated Electrons
Abstract

We present both time-averaged and time-resolved transport measurements of a two-dimensional electron (Wigner) crystal on the surface of superfluid helium confined in a narrow microchannel. We find that the field-current characteristics of the driven crystal obtained by the time-averaged measurements exhibit oscillations and negative differential conductivity. This unusual transport behavior was observed previously by Glasson et al. [Phys. Rev. Lett. 87, 176802 (2001)] and was attributed to a nonequilibrium transition of the electron system to a novel dynamically ordered phase of current filaments aligned along the channels. Contrarily to this explanation, our time-resolved transport measurements reveal that oscillating field-current characteristics appear due to dynamical decoupling (slipping) and recoupling (sticking) of the uniform electron crystal to the liquid helium substrate. Our result demonstrates that this unusual non-linear transport effect is intrinsic, does not depend on the device geometry, and is associated with the dynamical interaction of Wigner crystal with the surface excitations of the liquid substrate., Comment: 7 pages, 4 figures

Published
2021
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15. Diagnosis and management of pyruvate kinase deficiency: international expert guidelines

Author

Al-Samkari, Hanny, Shehata, Nadine, Lang-Robertson, Kelly, Bianchi, Paola, Glenthøj, Andreas, Sheth, Sujit, Neufeld, Ellis J, Rees, David C, Chonat, Satheesh, Kuo, Kevin H M, Rothman, Jennifer A, Barcellini, Wilma, van Beers, Eduard J, Pospíšilová, Dagmar, Shah, Ami J, van Wijk, Richard, Glader, Bertil, Mañú Pereira, Maria Del Mar, Andres, Oliver, Kalfa, Theodosia A, Eber, Stefan W, Gallagher, Patrick G, Kwiatkowski, Janet L, Galacteros, Frédéric, Lander, Carl, Watson, Alejandra, Elbard, Riyad, Peereboom, Dore, and Grace, Rachael F

Published
2024
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19. Defining global strategies to improve outcomes in sickle cell disease: a Lancet Haematology Commission

Author

Piel, Frédéric B, Rees, David C, DeBaun, Michael R, Nnodu, Obiageli, Ranque, Brigitte, Thompson, Alexis A, Ware, Russell E, Abboud, Miguel R, Abraham, Allistair, Ambrose, Emmanuela E, Andemariam, Biree, Colah, Roshan, Colombatti, Raffaella, Conran, Nicola, Costa, Fernando F, Cronin, Robert M, de Montalembert, Mariane, Elion, Jacques, Esrick, Erica, Greenway, Anthea L, Idris, Ibrahim M, Issom, David-Zacharie, Jain, Dipty, Jordan, Lori C, Kaplan, Zane S, King, Allison A, Lloyd-Puryear, Michele, Oppong, Samuel A, Sharma, Akshay, Sung, Lillian, Tshilolo, Leon, Wilkie, Diana J, and Ohene-Frempong, Kwaku

Published
2023
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29. A randomized, placebo-controlled, double-blind trial of canakinumab in children and young adults with sickle cell anemia

Author

Rees, David C., Kilinc, Yurdanur, Unal, Selma, Dampier, Carlton, Pace, Betty S., Kaya, Banu, Trompeter, Sara, Odame, Isaac, Mahlangu, Johnny, Unal, Sule, Brent, Julie, Grosse, Regine, Fuh, Beng R., Inusa, Baba P.D., Koren, Ariel, Leblebisatan, Goksel, Levin, Carina, McNamara, Elizabeth, Meiser, Karin, Hom, Douglas, and Oliver, Stephen J.

Published
2022
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30. Bistable Transport Properties of a Quasi-One-Dimensional Wigner Solid on Liquid Helium under Continuous Driving

Author

Rees, David G., Yeh, Sheng-Shiuan, Lee, Ban-Chen, Kono, Kimitoshi, and Lin, Juhn-Jong

Subjects
Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

We investigate low-frequency fluctuations in the transport characteristics of a quasi-1D Wigner solid (WS) moving along a liquid helium substrate in response to a sinusoidal driving voltage. The fluctuations occur between distinct transport modes in which the decoupling of the WS from ripplonic polarons (or 'dimple lattice', DL) formed on the helium surface does, or does not, occur during each ac cycle. We demonstrate that a Gaussian-like distribution in the decoupling threshold force gives rise to this bistability, as the low-frequency switching occurs when the probability of decoupling during each ac cycle is small but finite. We attribute the distribution in the decoupling threshold force to the range of structural configurations allowed for the quasi-1D electron lattice, which influences the strength of the WS-DL coupling. Hence, the switching rate between the ac transport modes is extremely sensitive to the microscopic properties of the electron solid.

Published
2017
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31. Assessing The Potential for School Lunch Programme Ka Ora, Ka Ako to Enhance Education, Sustainability and Health Goals.

Author

McKelvie-Sebileau, Pippa, Swinburn, Boyd, Rees, David, Glassey, Rachael, Tipene-Leach, David, and Garton, Kelly

Subjects
SCHOOL food, GOVERNMENT policy, FOOD security
Abstract

The Ka Ora, Ka Ako school lunch programme introduced in 2020 provides nutritious lunches to around 220,000 students in low-advantage schools. While the food security impacts of this programme have been well documented, its potential to enhance outcomes in other areas of public policy is underappreciated. We conducted a policy analysis to map the programme's intersection with current public policy agendas in education, sustainability and health in Aotearoa New Zealand. We conclude that Ka Ora, Ka Ako can be a powerful platform to effect broad societal outcomes through alignment with school curricula, concerted effort to reduce carbon emissions, and commitment to delivering highly nutritious foods to all students in qualifying schools. [ABSTRACT FROM AUTHOR]

Published
2024
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32. Upper and Lower Bounds to Pull-Out Loading of Inclined Hooked End Steel Fibres Embedded in Concrete.

Author

Rees, David W. A. and Abdallah, Sadoon

Subjects
SHEAR strength, TRANSVERSE strength (Structural engineering), FIBERS, STRUCTURAL design, STEEL
Abstract

Steel fibre-reinforced concrete (SFRC) consists of short, hooked steel fibres that are randomly distributed and oriented within the cementitious matrix. This paper presents a new analytical load-bounding approach that captures the tensile response of misaligned fibres embedded in the matrix. The contribution of fibres in bridging cracks to provide the required stress transfer relies on the orientation of the fibres in the concrete. Bridging fibres aligned with a crack are less effective than those inclined to it. Therefore, understanding the pull-out behaviour of misaligned fibres is a key factor in quantifying and optimising the design of SFRC in structural applications. In the laboratory, a single-oriented fibre embedded in a solid cylinder of concrete was subjected to a pull-out test, where the axis of the tensile force is aligned with the axis of the cylinder. Based on the observed behaviour, this paper presents a new analytical bounding approach to capture the pull-out response of misaligned hooked-end steel fibres embedded in a concrete matrix. The analysis was based on a transversely isotropic failure criterion assumed for the plasticity that occurs in the cold-drawn fibre. Lower and upper bounds to the loading failure were derived from fibre pull-out and fibre fracture, respectively. The division between bounds depended upon the fibre orientation, fibre diameter and the combined strengths of the steel and concrete. Bounding predictions were drawn from ratios between a fibre's shear strength and its transverse and axial uniaxial strengths, as found from a novel testing proposal. The two bounds were compared with new data and other experimental results published in the literature. The results showed that the region between the bounds captured the failure loads of embedded fibres with effective load-bearing orientations. A critical orientation was observed at maximum strength. The present interpretation of the plasticity occurring within off-axis, hooked-end steel fibres suggests that it is possible to optimise the strength of concrete using this method of reinforcement. [ABSTRACT FROM AUTHOR]

Published
2024
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33. Survival and complications in patients with haemoglobin E thalassaemia in Sri Lanka: a prospective, longitudinal cohort study

Author

Premawardhena, Anuja P, Ediriweera, Dileepa Senajith, Sabouhanian, Amir, Allen, Angela, Rees, David, de Silva, Shanthimala, Perera, Windsor, Katugaha, Nimal, Arambepola, Mahinda, Yamashita, Robert C, Mettananda, Sachith, Jiffry, Nilam, Mehta, Vikita, Cader, Refai, Bandara, Dayananda, St Pierre, Timothy, Muraca, Giulia, Fisher, Christopher, Kirubarajan, Abirami, Khan, Shawn, Allen, Stephen, Lamabadusuriya, Sanath P, Weatherall, David J, and Olivieri, Nancy F

Published
2022
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35. Structural Order and Melting of a Quasi-One-Dimensional Electron System

Author

Rees, David G., Beysengulov, Niyaz R., Teranishi, Yoshiaki, Tsao, Chun-Shuo, Yeh, Sheng-Shiuan, Chiu, Shao-Pin, Lin, Yong-Han, Tayurskii, Dmitrii A., Lin, Juhn-Jong, and Kono, Kimitoshi

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

We investigate the influence of confinement on the positional order of a quasi-1D electron system trapped on the surface of liquid helium. We find evidence that the melting of the Wigner solid (WS) depends on the confinement strength, as well as electron density and temperature. A reentrant solid-liquid-solid transition is observed for increasing electron density under constant electrostatic confinement. As the electron row number $N_y$ changes, varying commensurability results in a modulation of the WS order, even when $N_y$ is large (several tens). This is confirmed by Monte Carlo simulations.

Published
2016
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36. Stick-Slip Motion of the Wigner Solid on Liquid Helium

Author

Rees, David G., Beysengulov, Niyaz R., Lin, Juhn-Jong, and Kono, Kimitoshi

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Strongly Correlated Electrons
Abstract

We present time-resolved transport measurements of a Wigner solid (WS) on the surface of liquid Helium confined in a micron-scale channel. At rest, the WS is `dressed' by a cloud of quantised capillary waves (ripplons). Under a driving force, we find that repeated WS-ripplon decoupling leads to stick-slip current oscillations, the frequency of which can be tuned by adjusting the temperature, pressing electric field, or electron density. The WS on liquid He is a promising system for the study of polaron-like decoupling dynamics., Comment: 5 pages, 5 figures, and supplemental

Published
2016
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37. Infective Endocarditis in Patients on Chronic Hemodialysis

Author

Clara, Liliana, Sanchez, Marisa, Casabé, José, Cortes, Claudia, Nacinovich, Francisco, Oses, Pablo Fernandez, Ronderos, Ricardo, Sucari, Adriana, Thierer, Jorge, Altclas, Javier, Kogan, Silvia, Spelman, Denis, Athan, Eugene, Harris, Owen, Kennedy, Karina, Tan, Ren, Gordon, David, Papanicolas, Lito, Korman, Tony, Kotsanas, Despina, Dever, Robyn, Jones, Phillip, Konecny, Pam, Lawrence, Richard, Rees, David, Ryan, Suzanne, Feneley, Michael P., Harkness, John, Post, Jeffrey, Reinbott, Porl, Gattringer, Rainer, Wiesbauer, Franz, Andrade, Adriana Ribas, Passos de Brito, Ana Cláudia, Guimarães, Armenio Costa, Grinberg, Max, Mansur, Alfredo José, Siciliano, Rinaldo Focaccia, Varejao Strabelli, Tania Mara, Campos Vieira, Marcelo Luiz, de Medeiros Tranchesi, Regina Aparecida, Paiva, Marcelo Goulart, Fortes, Claudio Querido, de Oliveira Ramos, Auristela, Weksler, Clara, Ferraiuoli, Giovanna, Golebiovski, Wilma, Lamas, Cristiane, Karlowsky, James A., Keynan, Yoav, Morris, Andrew M., Rubinstein, Ethan, Jones, Sandra Braun, Garcia, Patricia, Cereceda, M., Fica, Alberto, Mella, Rodrigo Montagna, Fernandez, Ricardo, Franco, Liliana, Gonzalez, Javier, Jaramillo, Astrid Natalia, Barsic, Bruno, Bukovski, Suzana, Krajinovic, Vladimir, Pangercic, Ana, Rudez, Igor, Vincelj, Josip, Freiberger, Tomas, Pol, Jiri, Zaloudikova, Barbora, Ashour, Zainab, El Kholy, Amani, Mishaal, Marwa, Osama, Dina, Rizk, Hussien, Aissa, Neijla, Alauzet, Corentine, Alla, Francois, Campagnac, CHU Catherine, Doco-Lecompte, Thanh, Selton-Suty, Christine, Casalta, Jean-Paul, Fournier, Pierre-Edouard, Habib, Gilbert, Raoult, Didier, Thuny, Franck, Delahaye, Francois, Delahaye, Armelle, Vandenesch, Francois, Donal, Erwan, Donnio, Pierre Yves, Flecher, Erwan, Michelet, Christian, Revest, Matthieu, Tattevin, Pierre, Chevalier, Florent, Jeu, Antoine, Rémadi, Jean Paul, Rusinaru, Dan, Tribouilloy, Christophe, Bernard, Yvette, Chirouze, Catherine, Hoen, Bruno, Leroy, Joel, Plesiat, Patrick, Naber, Christoph, Neuerburg, Carl, Mazaheri, Bahram, Sophia Athanasia, Carl Neuerburg, Deliolanis, Ioannis, Giamarellou, Helen, Thomas, Tsaganos, Giannitsioti, Efthymia, Mylona, Elena, Paniara, Olga, Papanicolaou, Konstantinos, Pyros, John, Skoutelis, Athanasios, Papanikolaou, Konstantinos, Sharma, Gautam, Francis, Johnson, Nair, Lathi, Thomas, Vinod, Venugopal, Krishnan, Hannan, Margaret M., Hurley, John P., Wanounou, Maor, Gilon, Dan, Israel, Sarah, Korem, Maya, Strahilevitz, Jacob, Durante-Mangoni, Emanuele, Iossa, Domenico, Orlando, Serena, Ursi, Maria Paola, Pafundi, Pia Clara, D’Amico, Fabiana, Bernardo, Mariano, Cuccurullo, Susanna, Dialetto, Giovanni, Covino, Franco Enrico, Manduca, Sabrina, Della Corte, Alessandro, De Feo, Marisa, Tripodi, Marie Françoise, Cecchi, Enrico, De Rosa, Francesco, Forno, Davide, Imazio, Massimo, Trinchero, Rita, Grossi, Paolo, Lattanzio, Mariangela, Toniolo, Antonio, Goglio, Antonio, Raglio, Annibale, Ravasio, Veronica, Rizzi, Marco, Suter, Fredy, Carosi, Giampiero, Magri, Silvia, Signorini, Liana, Kanafani, Zeina, Kanj, Souha S., Sharif-Yakan, Ahmad, Abidin, Imran, Tamin, Syahidah Syed, Martínez, Eduardo Rivera, Soto Nieto, Gabriel Israel, van der Meer, Jan T.M., Chambers, Stephen, Holland, David, Morris, Arthur, Raymond, Nigel, Read, Kerry, Murdoch, David R., Dragulescu, Stefan, Ionac, Adina, Mornos, Cristian, Butkevich, O.M., Chipigina, Natalia, Kirill, Ozerecky, Vadim, Kulichenko, Vinogradova, Tatiana, Edathodu, Jameela, Halim, Magid, Liew, Yee-Yun, Tan, Ru-San, Lejko-Zupanc, Tatjana, Logar, Mateja, Mueller-Premru, Manica, Commerford, Patrick, Commerford, Anita, Deetlefs, Eduan, Hansa, Cass, Ntsekhe, Mpiko, Almela, Manel, Ambrosioni, Juan, Azqueta, Manuel, Brunet, Merce, Castro, Pedro, De Lazzari, Elisa, Falces, Carlos, Fuster, David, Fita, Guillermina, Garcia- de- la- Maria, Cristina, Garcia-Gonzalez, Javier, Gatell, Jose M., Llopis, Jaume, Marco, Francesc, Miró, José M., Moreno, Asuncion, Ortiz, José, Ninot, Salvador, Paré, J. Carlos, Pericas, Juan M., Quintana, Eduard, Ramirez, Jose, Rovira, Irene, Sandoval, Elena, Sitges, Marta, Tellez, Adrian, Tolosana, José M., Vidal, Barbara, Vila, Jordi, Anguera, Ignasi, Font, Bernat, Guma, Joan Raimon, Bermejo, Javier, Bouza, Emilio, Garcia Fernández, Miguel Angel, Gonzalez-Ramallo, Victor, Marín, Mercedes, Muñoz, Patricia, Pedromingo, Miguel, Roda, Jorge, Rodríguez-Créixems, Marta, Solis, Jorge, Almirante, Benito, Fernandez-Hidalgo, Nuria, Tornos, Pilar, de Alarcón, Arístides, Parra, Ricardo, Alestig, Eric, Johansson, Magnus, Olaison, Lars, Snygg-Martin, Ulrika, Pachirat, Orathai, Pachirat, Pimchitra, Pussadhamma, Burabha, Senthong, Vichai, Casey, Anna, Elliott, Tom, Lambert, Peter, Watkin, Richard, Eyton, Christina, Klein, John L., Bradley, Suzanne, Kauffman, Carol, Bedimo, Roger, Chu, Vivian H., Corey, G. Ralph, Crowley, Anna Lisa, Douglas, Pamela, Drew, Laura, Fowler, Vance G., Holland, Thomas, Lalani, Tahaniyat, Mudrick, Daniel, Samad, Zaniab, Sexton, Daniel, Stryjewski, Martin, Wang, Andrew, Woods, Christopher W., Lerakis, Stamatios, Cantey, Robert, Steed, Lisa, Wray, Dannah, Dickerman, Stuart A., Bonilla, Hector, DiPersio, Joseph, Salstrom, Sara-Jane, Baddley, John, Patel, Mukesh, Peterson, Gail, Stancoven, Amy, Levine, Donald, Riddle, Jonathan, Rybak, Michael, Cabell, Christopher H., Pericàs, Juan M., Jiménez-Exposito, Maria Jesús, Kourany, Wissam M., Montagna-Mella, Rodrigo, Mestres, Carlos A., de Lazzari, Elisa, Fowler, Vance G., Jr., and Miró, Jose M.

Published
2021
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39. Filtering Efficiency and Design Properties of Medical- and Non-Medical-Grade Face Masks: A Multiscale Modeling Approach.

Author

Rasekh, Manoochehr, Pisapia, Francesca, Hafizi, Sassan, and Rees, David

Subjects
MEDICAL masks, MULTISCALE modeling, SCANNING electron microscopy, PRESSURE drop (Fluid dynamics), INFECTIOUS disease transmission
Abstract

Approved medical face masks have been shown to prevent the spread of respiratory droplets associated with coronavirus transmission in specific settings. The primary goal of this study was to develop a new strategy to assess the filtering and transmissibility properties of medical- and non-medical-grade face masks. In this study, we designed and assessed the filtering efficiency of particles through six different masks with a diverse set of fabrics, textures (woven and non-woven), fiber diameters, and porosity. The filtering and transmissibility properties of face mask layers individually and in combination have been assessed using mathematical analyses and new experimental data. The latter provided velocity profiles and filtration efficiencies for which the data were shown to be predictable. The filtration efficacy and pressure drop across each fabric have been tested using an aerosol particle spray and scanning electron microscopy. To assess clinical significance, the temperature and humidity of the masks were tested on a group of healthy volunteers spanning various age ranges (9–79 years old), utilizing an embedded temperature sensor disc. Also, a mask filter model was developed using fluid dynamic simulations (Solidworks Flow) to evaluate the aerodynamic dispersion of respiratory droplets. Overall, the FFP2 and FFP3 masks demonstrated the highest filtration efficiencies, each exceeding 90%, a feature of multi-layered masks that is consistent with simulations demonstrating higher filtering efficiencies for small particles (<5 µm). The velocity and temperature simulations of all six masks revealed a low air velocity (~1 m/s) inside the mask and a temperature variation of approximately 3 °C during the breathing cycle. [ABSTRACT FROM AUTHOR]

Published
2024
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47. Red blood cell mannoses as phagocytic ligands mediating both sickle cell anaemia and malaria resistance

Author

Cao, Huan, Antonopoulos, Aristotelis, Henderson, Sadie, Wassall, Heather, Brewin, John, Masson, Alanna, Shepherd, Jenna, Konieczny, Gabriela, Patel, Bhinal, Williams, Maria-Louise, Davie, Adam, Forrester, Megan A., Hall, Lindsay, Minter, Beverley, Tampakis, Dimitris, Moss, Michael, Lennon, Charlotte, Pickford, Wendy, Erwig, Lars, Robertson, Beverley, Dell, Anne, Brown, Gordon D., Wilson, Heather M., Rees, David C., Haslam, Stuart M., Alexandra Rowe, J., Barker, Robert N., and Vickers, Mark A.

Published
2021
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48. End points for sickle cell disease clinical trials: patient-reported outcomes, pain, and the brain

Author

Farrell, Ann T., Panepinto, Julie, Carroll, C. Patrick, Darbari, Deepika S., Desai, Ankit A., King, Allison A., Adams, Robert J., Barber, Tabitha D., Brandow, Amanda M., DeBaun, Michael R., Donahue, Manus J., Gupta, Kalpna, Hankins, Jane S., Kameka, Michelle, Kirkham, Fenella J., Luksenburg, Harvey, Miller, Shirley, Oneal, Patricia Ann, Rees, David C., Setse, Rosanna, Sheehan, Vivien A., Strouse, John, Stucky, Cheryl L., Werner, Ellen M., Wood, John C., and Zempsky, William T.

Published
2019
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49. Will Suez shipping disruption derail hopes for rate cuts?

Author

Rees, David

Subjects
Shipping industry, Business, international
Abstract

Growing geopolitical tensions in the Middle East have begun to disrupt global supply chains. Following attacks by Houthi rebels on vessels passing through the Red Sea en route to the [...]

Published
2024

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