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1,270 results on '"Maccallum, P."'

1. Your device may know you better than you know yourself -- continuous authentication on novel dataset using machine learning

Author

Nascimento, Pedro Gomes do, Witiak, Pidge, MacCallum, Tucker, Winterfeldt, Zachary, and Dave, Rushit

Subjects
Computer Science - Artificial Intelligence
Abstract

This research aims to further understanding in the field of continuous authentication using behavioral biometrics. We are contributing a novel dataset that encompasses the gesture data of 15 users playing Minecraft with a Samsung Tablet, each for a duration of 15 minutes. Utilizing this dataset, we employed machine learning (ML) binary classifiers, being Random Forest (RF), K-Nearest Neighbors (KNN), and Support Vector Classifier (SVC), to determine the authenticity of specific user actions. Our most robust model was SVC, which achieved an average accuracy of approximately 90%, demonstrating that touch dynamics can effectively distinguish users. However, further studies are needed to make it viable option for authentication systems

Published
2024

3. WATonoBus: Field-Tested All-Weather Autonomous Shuttle Technology

Author

Bhatt, Neel P., Zhang, Ruihe, Ning, Minghao, Alghooneh, Ahmad Reza, Sun, Joseph, Panahandeh, Pouya, Mohammadbagher, Ehsan, Ecclestone, Ted, MacCallum, Ben, Hashemi, Ehsan, and Khajepour, Amir

Subjects
Computer Science - Robotics, Computer Science - Artificial Intelligence, Computer Science - Computer Vision and Pattern Recognition
Abstract

All-weather autonomous vehicle operation poses significant challenges, encompassing modules from perception and decision-making to path planning and control. The complexity arises from the need to address adverse weather conditions such as rain, snow, and fog across the autonomy stack. Conventional model-based single-module approaches often lack holistic integration with upstream or downstream tasks. We tackle this problem by proposing a multi-module and modular system architecture with considerations for adverse weather across the perception level, through features such as snow covered curb detection, to decision-making and safety monitoring. Through daily weekday service on the WATonoBus platform for almost two years, we demonstrate that our proposed approach is capable of addressing adverse weather conditions and provide valuable insights from edge cases observed during operation., Comment: 8 pages, 10 figures. This work has been submitted to the ITSC for possible publication

Published
2023

5. Recommendations for accelerating open preprint peer review to improve the culture of science.

Author

Avissar-Whiting, Michele, Belliard, Frédérique, Bertozzi, Stefano, Brand, Amy, Brown, Katherine, Clément-Stoneham, Géraldine, Dawson, Stephanie, Dey, Gautam, Ecer, Daniel, Edmunds, Scott, Farley, Ashley, Fischer, Tara, Franko, Maryrose, Fraser, James, Funk, Kathryn, Ganier, Clarisse, Harrison, Melissa, Hatch, Anna, Hazlett, Haley, Hindle, Samantha, Hook, Daniel, Hurst, Phil, Kamoun, Sophien, Kiley, Robert, Lacy, Michael, LaFlamme, Marcel, Lawrence, Rebecca, Lemberger, Thomas, Leptin, Maria, Lumb, Elliott, MacCallum, Catriona, Marcum, Christopher, Marinello, Gabriele, Mendonça, Alex, Monaco, Sara, Neves, Kleber, Pattinson, Damian, Polka, Jessica, Puebla, Iratxe, Rittman, Martyn, Royle, Stephen, Saderi, Daniela, Sever, Richard, Shearer, Kathleen, Spiro, John, Stern, Bodo, Taraborelli, Dario, Vale, Ron, Vasquez, Claudia, Waltman, Ludo, Watt, Fiona, Weinberg, Zara, and Williams, Mark

Subjects
Humans, Motion, Peer Review, Research Personnel
Abstract

Peer review is an important part of the scientific process, but traditional peer review at journals is coming under increased scrutiny for its inefficiency and lack of transparency. As preprints become more widely used and accepted, they raise the possibility of rethinking the peer-review process. Preprints are enabling new forms of peer review that have the potential to be more thorough, inclusive, and collegial than traditional journal peer review, and to thus fundamentally shift the culture of peer review toward constructive collaboration. In this Consensus View, we make a call to action to stakeholders in the community to accelerate the growing momentum of preprint sharing and provide recommendations to empower researchers to provide open and constructive peer review for preprints.

Published
2024

10. Stratified analyses refine association between TLR7 rare variants and severe COVID-19

Author

Jannik Boos, Caspar I. van der Made, Gayatri Ramakrishnan, Eamon Coughlan, Rosanna Asselta, Britt-Sabina Löscher, Luca V.C. Valenti, Rafael de Cid, Luis Bujanda, Antonio Julià, Erola Pairo-Castineira, J. Kenneth Baillie, Sandra May, Berina Zametica, Julia Heggemann, Agustín Albillos, Jesus M. Banales, Jordi Barretina, Natalia Blay, Paolo Bonfanti, Maria Buti, Javier Fernandez, Sara Marsal, Daniele Prati, Luisa Ronzoni, Nicoletta Sacchi, Joachim L. Schultze, Olaf Riess, Andre Franke, Konrad Rawlik, David Ellinghaus, Alexander Hoischen, Axel Schmidt, Kerstin U. Ludwig, Valeria Rimoldi, Elvezia M. Paraboschi, Alessandra Bandera, Flora Peyvandi, Giacomo Grasselli, Francesco Blasi, Francesco Malvestiti, Serena Pelusi, Cristiana Bianco, Lorenzo Miano, Angela Lombardi, Pietro Invernizzi, Alessio Gerussi, Giuseppe Citerio, Andrea Biondi, Maria Grazia Valsecchi, Marina Elena Cazzaniga, Giuseppe Foti, Ilaria Beretta, Mariella D'Angiò, Laura Rachele Bettini, Xavier Farré, Susana Iraola-Guzmán, Manolis Kogevinas, Gemma Castaño-Vinyals, Koldo Garcia-Etxebarria, Beatriz Nafria, Mauro D'Amato, Adriana Palom, Colin Begg, Sara Clohisey, Charles Hinds, Peter Horby, Julian Knight, Lowell Ling, David Maslove, Danny McAuley, Johnny Millar, Hugh Montgomery, Alistair Nichol, Peter J.M. Openshaw, Alexandre C. Pereira, Chris P. Ponting, Kathy Rowan, Malcolm G. Semple, Manu Shankar-Hari, Charlotte Summers, Timothy Walsh, Latha Aravindan, Ruth Armstrong, Heather Biggs, Ceilia Boz, Adam Brown, Richard Clark, Audrey Coutts, Judy Coyle, Louise Cullum, Sukamal Das, Nicky Day, Lorna Donnelly, Esther Duncan, Angie Fawkes, Paul Fineran, Max Head Fourman, Anita Furlong, James Furniss, Bernadette Gallagher, Tammy Gilchrist, Ailsa Golightly, Fiona Griffiths, Katarzyna Hafezi, Debbie Hamilton, Ross Hendry, Andy Law, Dawn Law, Rachel Law, Sarah Law, Rebecca Lidstone-Scott, Louise Macgillivray, Alan Maclean, Hanning Mal, Sarah McCafferty, Ellie Mcmaster, Jen Meikle, Shona C. Moore, Kirstie Morrice, Lee Murphy, Sheena Murphy, Mybaya Hellen, Wilna Oosthuyzen, Chenqing Zheng, Jiantao Chen, Nick Parkinson, Trevor Paterson, Katherine Schon, Andrew Stenhouse, Mihaela Das, Maaike Swets, Helen Szoor-McElhinney, Filip Taneski, Lance Turtle, Tony Wackett, Mairi Ward, Jane Weaver, Nicola Wrobel, Marie Zechner, Gill Arbane, Aneta Bociek, Sara Campos, Neus Grau, Tim Owen Jones, Rosario Lim, Martina Marotti, Marlies Ostermann, Christopher Whitton, Zoe Alldis, Raine Astin-Chamberlain, Fatima Bibi, Jack Biddle, Sarah Blow, Matthew Bolton, Catherine Borra, Ruth Bowles, Maudrian Burton, Yasmin Choudhury, David Collier, Amber Cox, Amy Easthope, Patrizia Ebano, Stavros Fotiadis, Jana Gurasashvili, Rosslyn Halls, Pippa Hartridge, Delordson Kallon, Jamila Kassam, Ivone Lancoma-Malcolm, Maninderpal Matharu, Peter May, Oliver Mitchelmore, Tabitha Newman, Mital Patel, Jane Pheby, Irene Pinzuti, Zoe Prime, Oleksandra Prysyazhna, Julian Shiel, Melanie Taylor, Carey Tierney, Suzanne Wood, Anne Zak, Olivier Zongo, Stephen Bonner, Keith Hugill, Jessica Jones, Steven Liggett, Evie Headlam, Nageswar Bandla, Minnie Gellamucho, Michelle Davies, Christopher Thompson, Marwa Abdelrazik, Dhanalakshmi Bakthavatsalam, Munzir Elhassan, Arunkumar Ganesan, Anne Haldeos, Jeronimo Moreno-Cuesta, Dharam Purohit, Rachel Vincent, Kugan Xavier, Kumar Rohit, Frater Alasdair, Malik Saleem, Carter David, Jenkins Samuel, Zoe Lamond, Wall Alanna, Jaime Fernandez-Roman, David O. Hamilton, Emily Johnson, Brian Johnston, Maria Lopez Martinez, Suleman Mulla, David Shaw, Alicia A.C. Waite, Victoria Waugh, Ingeborg D. Welters, Karen Williams, Anna Cavazza, Maeve Cockrell, Eleanor Corcoran, Maria Depante, Clare Finney, Ellen Jerome, Mark McPhail, Monalisa Nayak, Harriet Noble, Kevin O'Reilly, Evita Pappa, Rohit Saha, Sian Saha, John Smith, Abigail Knighton, David Antcliffe, Dorota Banach, Stephen Brett, Phoebe Coghlan, Ziortza Fernandez, Anthony Gordon, Roceld Rojo, Sonia Sousa Arias, Maie Templeton, Megan Meredith, Lucy Morris, Lucy Ryan, Amy Clark, Julia Sampson, Cecilia Peters, Martin Dent, Margaret Langley, Saima Ashraf, Shuying Wei, Angela Andrew, Archana Bashyal, Neil Davidson, Paula Hutton, Stuart McKechnie, Jean Wilson, David Baptista, Rebecca Crowe, Rita Fernandes, Rosaleen Herdman-Grant, Anna Joseph, Denise O'Connor, Meryem Allen, Adam Loveridge, India McKenley, Eriko Morino, Andres Naranjo, Richard Simms, Kathryn Sollesta, Andrew Swain, Harish Venkatesh, Jacyntha Khera, Jonathan Fox, Gillian Andrew, Lucy Barclay, Marie Callaghan, Rachael Campbell, Sarah Clark, Dave Hope, Lucy Marshall, Corrienne McCulloch, Kate Briton, Jo Singleton, Sohphie Birch, Lutece Brimfield, Zoe Daly, David Pogson, Steve Rose, Ceri Battle, Elaine Brinkworth, Rachel Harford, Carl Murphy, Luke Newey, Tabitha Rees, Marie Williams, Sophie Arnold, Petra Polgarova, Katerina Stroud, Eoghan Meaney, Megan Jones, Anthony Ng, Shruti Agrawal, Nazima Pathan, Deborah White, Esther Daubney, Kay Elston, Lina Grauslyte, Musarat Hussain, Mandeep Phull, Tatiana Pogreban, Lace Rosaroso, Erika Salciute, George Franke, Joanna Wong, Aparna George, Laura Ortiz-Ruiz de Gordoa, Emily Peasgood, Claire Phillips, Michelle Bates, Jo Dasgin, Jaspret Gill, Annette Nilsson, James Scriven, Carlos Castro Delgado, Deborah Dawson, Lijun Ding, Georgia Durrant, Obiageri Ezeobu, Sarah Farnell-Ward, Abiola Harrison, Rebecca Kanu, Susannah Leaver, Elena Maccacari, Soumendu Manna, Romina Pepermans Saluzzio, Joana Queiroz, Tinashe Samakomva, Christine Sicat, Joana Texeira, Edna Fernandes Da Gloria, Ana Lisboa, John Rawlins, Jisha Mathew, Ashley Kinch, William James Hurt, Nirav Shah, Victoria Clark, Maria Thanasi, Nikki Yun, Kamal Patel, Sara Bennett, Emma Goodwin, Matthew Jackson, Alissa Kent, Clare Tibke, Wiesia Woodyatt, Ahmed Zaki, Azmerelda Abraheem, Peter Bamford, Kathryn Cawley, Charlie Dunmore, Maria Faulkner, Rumanah Girach, Helen Jeffrey, Rhianna Jones, Emily London, Imrun Nagra, Farah Nasir, Hannah Sainsbury, Clare Smedley, Tahera Patel, Matthew Smith, Srikanth Chukkambotla, Aayesha Kazi, Janice Hartley, Joseph Dykes, Muhammad Hijazi, Sarah Keith, Meherunnisa Khan, Janet Ryan-Smith, Philippa Springle, Jacqueline Thomas, Nick Truman, Samuel Saad, Dabheoc Coleman, Christopher Fine, Roseanna Matt, Bethan Gay, Jack Dalziel, Syamlan Ali, Drew Goodchild, Rhiannan Harling, Ravi Bhatterjee, Wendy Goddard, Chloe Davison, Stephen Duberly, Jeanette Hargreaves, Rachel Bolton, Miriam Davey, David Golden, Rebecca Seaman, Shiney Cherian, Sean Cutler, Anne Emma Heron, Anna Roynon-Reed, Tamas Szakmany, Gemma Williams, Owen Richards, Yusuf Cheema, Hollie Brooke, Sarah Buckley, Jose Cebrian Suarez, Ruth Charlesworth, Karen Hansson, John Norris, Alice Poole, Alastair Rose, Rajdeep Sandhu, Brendan Sloan, Elizabeth Smithson, Muthu Thirumaran, Veronica Wagstaff, Alexandra Metcalfe, Mark Brunton, Jess Caterson, Holly Coles, Matthew Frise, Sabi Gurung Rai, Nicola Jacques, Liza Keating, Emma Tilney, Shauna Bartley, Parminder Bhuie, Sian Gibson, Amanda Lyle, Fiona McNeela, Jayachandran Radhakrishnan, Alistair Hughes, Bryan Yates, Jessica Reynolds, Helen Campbell, Maria Thompsom, Steve Dodds, Stacey Duffy, Sandra Greer, Karen Shuker, Ascanio Tridente, Reena Khade, Ashok Sundar, George Tsinaslanidis, Isobel Birkinshaw, Joseph Carter, Kate Howard, Joanne Ingham, Rosie Joy, Harriet Pearson, Samantha Roche, Zoe Scott, Hollie Bancroft, Mary Bellamy, Margaret Carmody, Jacqueline Daglish, Faye Moore, Joanne Rhodes, Mirriam Sangombe, Salma Kadiri, Maria Croft, Ian White, Victoria Frost, Maia Aquino, Rajeev Jha, Vinodh Krishnamurthy, Lai Lim, Li Lim, Edward Combes, Teishel Joefield, Sonja Monnery, Valerie Beech, Sallyanne Trotman, Christine Almaden-Boyle, Pauline Austin, Louise Cabrelli, Stephen Cole, Matt Casey, Susan Chapman, Clare Whyte, Yolanda Baird, Aaron Butler, Indra Chadbourn, Linda Folkes, Heather Fox, Amy Gardner, Raquel Gomez, Gillian Hobden, Luke Hodgson, Kirsten King, Michael Margarson, Tim Martindale, Emma Meadows, Dana Raynard, Yvette Thirlwall, David Helm, Jordi Margalef, Kristine Criste, Rebecca Cusack, Kim Golder, Hannah Golding, Oliver Jones, Samantha Leggett, Michelle Male, Martyna Marani, Kirsty Prager, Toran Williams, Belinda Roberts, Karen Salmon, Peter Anderson, Katie Archer, Karen Austin, Caroline Davis, Alison Durie, Olivia Kelsall, Jessica Thrush, Charlie Vigurs, Laura Wild, Hannah-Louise Wood, Helen Tranter, Alison Harrison, Nicholas Cowley, Michael McAlindon, Andrew Burtenshaw, Stephen Digby, Emma Low, Aled Morgan, Naiara Cother, Tobias Rankin, Sarah Clayton, Alex McCurdy, Cecilia Ahmed, Balvinder Baines, Sarah Clamp, Julie Colley, Risna Haq, Anne Hayes, Jonathan Hulme, Samia Hussain, Sibet Joseph, Rita Kumar, Zahira Maqsood, Manjit Purewal, Leonie Benham, Zena Bradshaw, Joanna Brown, Melanie Caswell, Jason Cupitt, Sarah Melling, Stephen Preston, Nicola Slawson, Emma Stoddard, Scott Warden, Bethan Deacon, Ceri Lynch, Carla Pothecary, Lisa Roche, Gwenllian Sera Howe, Jayaprakash Singh, Keri Turner, Hannah Ellis, Natalie Stroud, Jodie Hunt, Joy Dearden, Emma Dobson, Andy Drummond, Michelle Mulcahy, Sheila Munt, Grainne O'Connor, Jennifer Philbin, Chloe Rishton, Redmond Tully, Sarah Winnard, Susanne Cathcart, Katharine Duffy, Alex Puxty, Kathryn Puxty, Lynne Turner, Jane Ireland, Gary Semple, Kate Long, Simon Whiteley, Elizabeth Wilby, Bethan Ogg, Amanda Cowton, Andrea Kay, Melanie Kent, Kathryn Potts, Ami Wilkinson, Suzanne Campbell, Ellen Brown, Julie Melville, Jay Naisbitt, Rosane Joseph, Maria Lazo, Olivia Walton, Alan Neal, Peter Alexander, Schvearn Allen, Joanne Bradley-Potts, Craig Brantwood, Jasmine Egan, Timothy Felton, Grace Padden, Luke Ward, Stuart Moss, Susannah Glasgow, Lynn Abel, Michael Brett, Brian Digby, Lisa Gemmell, James Hornsby, Patrick MacGoey, Pauline O'Neil, Richard Price, Natalie Rodden, Kevin Rooney, Radha Sundaram, Nicola Thomson, Bridget Hopkins, Laura Thrasyvoulou, Heather Willis, Martyn Clark, Martina Coulding, Edward Jude, Jacqueline McCormick, Oliver Mercer, Darsh Potla, Hafiz Rehman, Heather Savill, Victoria Turner, Charlotte Downes, Kathleen Holding, Katie Riches, Mary Hilton, Mel Hayman, Deepak Subramanian, Priya Daniel, Oluronke Adanini, Nikhil Bhatia, Maines Msiska, Rebecca Collins, Ian Clement, Bijal Patel, A. Gulati, Carole Hays, K. Webster, Anne Hudson, Andrea Webster, Elaine Stephenson, Louise McCormack, Victoria Slater, Rachel Nixon, Helen Hanson, Maggie Fearby, Sinead Kelly, Victoria Bridgett, Philip Robinson, Julie Camsooksai, Charlotte Humphrey, Sarah Jenkins, Henrik Reschreiter, Beverley Wadams, Yasmin Death, Victoria Bastion, Daphene Clarke, Beena David, Harriet Kent, Rachel Lorusso, Gamu Lubimbi, Sophie Murdoch, Melchizedek Penacerrada, Alastair Thomas, Jennifer Valentine, Ana Vochin, Retno Wulandari, Brice Djeugam, Gillian Bell, Katy English, Amro Katary, Louise Wilcox, Michelle Bruce, Karen Connolly, Tracy Duncan, Helen T-Michael, Gabriella Lindergard, Samuel Hey, Claire Fox, Jordan Alfonso, Laura Jayne Durrans, Jacinta Guerin, Bethan Blackledge, Jade Harris, Martin Hruska, Ayaa Eltayeb, Thomas Lamb, Tracey Hodgkiss, Lisa Cooper, Joanne Rothwell, Angela Allan, Felicity Anderson, Callum Kaye, Jade Liew, Jasmine Medhora, Teresa Scott, Erin Trumper, Adriana Botello, Liana Lankester, Nikitas Nikitas, Colin Wells, Bethan Stowe, Kayleigh Spencer, Craig Brandwood, Lara Smith, Katie Birchall, Laurel Kolakaluri, Deborah Baines, Anila Sukumaran, Elena Apetri, Cathrine Basikolo, Laura Catlow, Bethan Charles, Paul Dark, Reece Doonan, Alice Harvey, Daniel Horner, Karen Knowles, Stephanie Lee, Diane Lomas, Chloe Lyons, Tracy Marsden, Danielle McLaughlan, Liam McMorrow, Jessica Pendlebury, Jane Perez, Maria Poulaka, Nicola Proudfoot, Melanie Slaughter, Kathryn Slevin, Vicky Thomas, Danielle Walker, Angiy Michael, Matthew Collis, Tracey Cosier, Gemma Millen, Neil Richardson, Natasha Schumacher, Heather Weston, James Rand, Nicola Baxter, Steven Henderson, Sophie Kennedy-Hay, Christopher McParland, Laura Rooney, Malcolm Sim, Gordan McCreath, Louise Akeroyd, Shereen Bano, Matt Bromley, Lucy Gurr, Tom Lawton, James Morgan, Kirsten Sellick, Deborah Warren, Brian Wilkinson, Janet McGowan, Camilla Ledgard, Amelia Stacey, Kate Pye, Ruth Bellwood, Michael Bentley, Jeremy Bewley, Zoe Garland, Lisa Grimmer, Bethany Gumbrill, Rebekah Johnson, Katie Sweet, Denise Webster, Georgia Efford, Karen Convery, Deirdre Fottrell-Gould, Lisa Hudig, Jocelyn Keshet-Price, Georgina Randell, Katie Stammers, Maria Bokhari, Vanessa Linnett, Rachael Lucas, Wendy McCormick, Jenny Ritzema, Amanda Sanderson, Helen Wild, Anthony Rostron, Alistair Roy, Lindsey Woods, Sarah Cornell, Fiona Wakinshaw, Kimberley Rogerson, Jordan Jarmain, Robert Parker, Amie Reddy, Ian Turner-Bone, Laura Wilding, Peter Harding, Caroline Abernathy, Louise Foster, Andrew Gratrix, Vicky Martinson, Priyai Parkinson, Elizabeth Stones, Llucia Carbral-Ortega, Georgia Bercades, David Brealey, Ingrid Hass, Niall MacCallum, Gladys Martir, Eamon Raith, Anna Reyes, Deborah Smyth, Letizia Zitter, Sarah Benyon, Suzie Marriott, Linda Park, Samantha Keenan, Elizabeth Gordon, Helen Quinn, Kizzy Baines, Lenka Cagova, Adama Fofano, Lucie Garner, Helen Holcombe, Sue Mepham, Alice Michael Mitchell, Lucy Mwaura, Krithivasan Praman, Alain Vuylsteke, Julie Zamikula, Bally Purewal, Vanessa Rivers, Stephanie Bell, Hayley Blakemore, Borislava Borislavova, Beverley Faulkner, Emma Gendall, Elizabeth Goff, Kati Hayes, Matt Thomas, Ruth Worner, Kerry Smith, Deanna Stephens, Louise Mew, Esther Mwaura, Richard Stewart, Felicity Williams, Lynn Wren, Sara-Beth Sutherland, Emily Bevan, Jane Martin, Dawn Trodd, Geoff Watson, Caroline Wrey Brown, Amy Collins, Waqas Khaliq, Estefania Treus Gude, Olugbenga Akinkugbe, Alasdair Bamford, Emily Beech, Holly Belfield, Michael Bell, Charlene Davies, Gareth A.L. Jones, Tara McHugh, Hamza Meghari, Lauran O'Neill, Mark J. Peters, Samiran Ray, Ana Luisa Tomas, Iona Burn, Geraldine Hambrook, Katarina Manso, Ruth Penn, Pradeep Shanmugasundaram, Julie Tebbutt, Danielle Thornton, Jade Cole, Rhys Davies, Donna Duffin, Helen Hill, Ben Player, Emma Thomas, Angharad Williams, Denise Griffin, Nycola Muchenje, Mcdonald Mupudzi, Richard Partridge, Jo-Anna Conyngham, Rachel Thomas, Mary Wright, Maria Alvarez Corral, Reni Jacob, Cathy Jones, Craig Denmade, Sarah Beavis, Katie Dale, Rachel Gascoyne, Joanne Hawes, Kelly Pritchard, Lesley Stevenson, Amanda Whileman, Patricia Doble, Joanne Hutter, Corinne Pawley, Charmaine Shovelton, Marius Vaida, Deborah Butcher, Susie O'Sullivan, Nicola Butterworth-Cowin, Norfaizan Ahmad, Joann Barker, Kris Bauchmuller, Sarah Bird, Kay Cawthron, Kate Harrington, Yvonne Jackson, Faith Kibutu, Becky Lenagh, Shamiso Masuko, Gary H. Mills, Ajay Raithatha, Matthew Wiles, Jayne Willson, Helen Newell, Alison Lye, Lorenza Nwafor, Claire Jarman, Sarah Rowland-Jones, David Foote, Joby Cole, Roger Thompson, James Watson, Lisa Hesseldon, Irene Macharia, Luke Chetam, Jacqui Smith, Amber Ford, Samantha Anderson, Kathryn Birchall, Kay Housley, Sara Walker, Leanne Milner, Helena Hanratty, Helen Trower, Patrick Phillips, Simon Oxspring, Ben Donne, Catherine Jardine, Dewi Williams, Alasdair Hay, Rebecca Flanagan, Gareth Hughes, Scott Latham, Emma McKenna, Jennifer Anderson, Robert Hull, Kat Rhead, Carina Cruz, Natalie Pattison, Rob Charnock, Denise McFarland, Denise Cosgrove, Ashar Ahmed, Anna Morris, Srinivas Jakkula, Asifa Ali, Megan Brady, Sam Dale, Annalisa Dance, Lisa Gledhill, Jill Greig, Kathryn Hanson, Kelly Holdroyd, Marie Home, Diane Kelly, Ross Kitson, Lear Matapure, Deborah Melia, Samantha Mellor, Tonicha Nortcliffe, Jez Pinnell, Matthew Robinson, Lisa Shaw, Ryan Shaw, Lesley Thomis, Alison Wilson, Tracy Wood, Lee-Ann Bayo, Ekta Merwaha, Tahira Ishaq, Sarah Hanley, Meg Hibbert, Dariusz Tetla, Chrsitopher Woodford, Latha Durga, Gareth Kennard-Holden, Debbie Branney, Jordan Frankham, Sally Pitts, Nigel White, Shondipon Laha, Mark Verlander, Alexandra Williams, Abdelhakim Altabaibeh, Ana Alvaro, Kayleigh Gilbert, Louise Ma, Loreta Mostoles, Chetan Parmar, Kathryn Simpson, Champa Jetha, Lauren Booker, Anezka Pratley, Colene Adams, Anita Agasou, Tracie Arden, Amy Bowes, Pauline Boyle, Mandy Beekes, Heather Button, Nigel Capps, Mandy Carnahan, Anne Carter, Danielle Childs, Denise Donaldson, Kelly Hard, Fran Hurford, Yasmin Hussain, Ayesha Javaid, James Jones, Sanal Jose, Michael Leigh, Terry Martin, Helen Millward, Nichola Motherwell, Rachel Rikunenko, Jo Stickley, Julie Summers, Louise Ting, Helen Tivenan, Louise Tonks, Rebecca Wilcox, Maureen Holland, Natalie Keenan, Marc Lyons, Helen Wassall, Chris Marsh, Mervin Mahenthran, Emma Carter, Thomas Kong, Helen Blackman, Ben Creagh-Brown, Sinead Donlon, Natalia Michalak-Glinska, Sheila Mtuwa, Veronika Pristopan, Armorel Salberg, Eleanor Smith, Sarah Stone, Charles Piercy, Jerik Verula, Dorota Burda, Rugia Montaser, Lesley Harden, Irving Mayangao, Cheryl Marriott, Paul Bradley, Celia Harris, Susan Anderson, Eleanor Andrews, Janine Birch, Emma Collins, Kate Hammerton, Ryan O'Leary, Michele Clark, Sarah Purvis, Russell Barber, Claire Hewitt, Annette Hilldrith, Karen Jackson-Lawrence, Sarah Shepardson, Maryanne Wills, Susan Butler, Silvia Tavares, Amy Cunningham, Julia Hindale, Sarwat Arif, Sarah Bean, Karen Burt, Michael Spivey, Carrie Demetriou, Charlotte Eckbad, Sarah Hierons, Lucy Howie, Sarah Mitchard, Lidia Ramos, Alfredo Serrano-Ruiz, Katie White, Fiona Kelly, Daniele Cristiano, Natalie Dormand, Zohreh Farzad, Mahitha Gummadi, Kamal Liyanage, Brijesh Patel, Sara Salmi, Geraldine Sloane, Vicky Thwaites, Mathew Varghese, Anelise C. Zborowski, John Allan, Tim Geary, Gordon Houston, Alistair Meikle, Peter O'Brien, Miranda Forsey, Agilan Kaliappan, Anne Nicholson, Joanne Riches, Mark Vertue, Elizabeth Allan, Kate Darlington, Ffyon Davies, Jack Easton, Sumit Kumar, Richard Lean, Daniel Menzies, Richard Pugh, Xinyi Qiu, Llinos Davies, Hannah Williams, Jeremy Scanlon, Gwyneth Davies, Callum Mackay, Joannne Lewis, Stephanie Rees, Metod Oblak, Monica Popescu, Mini Thankachen, Andrew Higham, Kerry Simpson, Jayne Craig, Rosie Baruah, Sheila Morris, Susie Ferguson, Amy Shepherd, Luke Stephen Prockter Moore, Marcela Paola Vizcaychipi, Laura Gomes de Almeida Martins, Jaime Carungcong, Inthakab Ali Mohamed Ali, Karen Beaumont, Mark Blunt, Zoe Coton, Hollie Curgenven, Mohamed Elsaadany, Kay Fernandes, Sameena Mohamed Ally, Harini Rangarajan, Varun Sarathy, Sivarupan Selvanayagam, Dave Vedage, Matthew White, Mandy Gill, Paul Paul, Valli Ratnam, Sarah Shelton, Inez Wynter, Siobhain Carmody, Valerie Joan Page, Claire Marie Beith, Karen Black, Suzanne Clements, Alan Morrison, Dominic Strachan, Margaret Taylor, Michelle Clarkson, Stuart D'Sylva, Kathryn Norman, Fiona Auld, Joanne Donnachie, Ian Edmond, Lynn Prentice, Nikole Runciman, Dario Salutous, Lesley Symon, Anne Todd, Patricia Turner, Abigail Short, Laura Sweeney, Euan Murdoch, Dhaneesha Senaratne, Michaela Hill, Thogulava Kannan, Wild Laura, Rikki Crawley, Abigail Crew, Mishell Cunningham, Allison Daniels, Laura Harrison, Susan Hope, Ken Inweregbu, Sian Jones, Nicola Lancaster, Jamie Matthews, Alice Nicholson, Gemma Wray, Helen Langton, Rachel Prout, Malcolm Watters, Catherine Novis, Anthony Barron, Ciara Collins, Sundeep Kaul, Heather Passmore, Claire Prendergast, Anna Reed, Paula Rogers, Rajvinder Shokkar, Meriel Woodruff, Hayley Middleton, Oliver Polgar, Claire Nolan, Kanta Mahay, Dawn Collier, Anil Hormis, Victoria Maynard, Cheryl Graham, Rachel Walker, Ellen Knights, Alicia Price, Alice Thomas, Chris Thorpe, Teresa Behan, Caroline Burnett, Jonathan Hatton, Elaine Heeney, Atideb Mitra, Maria Newton, Rachel Pollard, Rachael Stead, Vishal Amin, Elena Anastasescu, Vikram Anumakonda, Komala Karthik, Rizwana Kausar, Karen Reid, Jacqueline Smith, Janet Imeson-Wood, Denise Skinner, Jane Gaylard, Dee Mullan, Julie Newman, Alison Brown, Vikki Crickmore, Gabor Debreceni, Joy Wilkins, Liz Nicol, Rosie Reece-Anthony, Mark Birt, Alison Ghosh, Emma Williams, Louise Allen, Eva Beranova, Nikki Crisp, Joanne Deery, Tracy Hazelton, Alicia Knight, Carly Price, Sorrell Tilbey, Salah Turki, Sharon Turney, Joshua Cooper, Cheryl Finch, Sarah Liderth, Alison Quinn, Natalia Waddington, Tina Coventry, Susan Fowler, Michael MacMahon, Amanda McGregor, Anne Cowley, Judith Highgate, Jane Gregory, Susan O'Connell, Tim Smith, Luigi Barberis, Shameer Gopal, Nichola Harris, Victoria Lake, Stella Metherell, Elizabeth Radford, Amelia Daniel, Joanne Finn, Rajnish Saha, Nikki White, Phil Donnison, Fiona Trim, Beena Eapen, Jenny Birch, Laura Bough, Josie Goodsell, Rebecca Tutton, Patricia Williams, Sarah Williams, Barbara Winter-Goodwin, Ailstair Nichol, Kathy Brickell, Michelle Smyth, Lorna Murphy, Samantha Coetzee, Alistair Gales, Igor Otahal, Meena Raj, Craig Sell, Paula Hilltout, Jayne Evitts, Amanda Tyler, Joanne Waldron, Kate Beesley, Sarah Board, Agnieszka Kubisz-Pudelko, Alison Lewis, Jess Perry, Lucy Pippard, Di Wood, Clare Buckley, Peter Barry, Neil Flint, Patel Rekha, Dawn Hales, Lara Bunni, Claire Jennings, Monica Latif, Rebecca Marshall, Gayathri Subramanian, Peter J. McGuigan, Christopher Wasson, Stephanie Finn, Jackie Green, Erin Collins, Bernadette King, Andy Campbell, Sara Smuts, Joseph Duffield, Oliver Smith, Lewis Mallon, Watkins Claire, Liam Botfield, Joanna Butler, Catherine Dexter, Jo Fletcher, Atul Garg, Aditya Kuravi, Poonam Ranga, Emma Virgilio, Zakaula Belagodu, Bridget Fuller, Anca Gherman, Olumide Olufuwa, Remi Paramsothy, Carmel Stuart, Naomi Oakley, Charlotte Kamundi, David Tyl, Katy Collins, Pedro Silva, June Taylor, Laura King, Charlotte Coates, Maria Crowley, Phillipa Wakefield, Jane Beadle, Laura Johnson, Janet Sargeant, Madeleine Anderson, Ailbhe Brady, Rebekah Chan, Jeff Little, Shane McIvor, Helena Prady, Helen Whittle, Bijoy Mathew, Ben Attwood, Penny Parsons, Geraldine Ward, Pamela Bremmer, West Joe, Baird Tracy, Ruddy Jim, Ellie Davies, Sonia Sathe, Catherine Dennis, Alastair McGregor, Victoria Parris, Sinduya Srikaran, Anisha Sukha, Noreen Clarke, Jonathan Whiteside, Mairi Mascarenhas, Avril Donaldson, Joanna Matheson, Fiona Barrett, Marianne O'Hara, Laura Okeefe, Clare Bradley, Christine Eastgate-Jackson, Helder Filipe, Daniel Martin, Amitaa Maharajh, Sara Mingo Garcia, Glykeria Pakou, Mark De Neef, Kathy Dent, Elizabeth Horsley, Muhmmad Nauman Akhtar, Sandra Pearson, Dorota Potoczna, Sue Spencer, Melanie Clapham, Rosemary Harper, Una Poultney, Polly Rice, Rachel Mutch, Lisa Armstrong, Hayley Bates, Emma Dooks, Fiona Farquhar, Brigid Hairsine, Chantal McParland, Sophie Packham, Rehana Bi, Barney Scholefield, Lydia Ashton, Linsha George, Sophie Twiss, David Wright, Manish Chablani, Amy Kirkby, Kimberley Netherton, Kim Davies, Linda O'Brien, Zohra Omar, Emma Perkins, Tracy Lewis, Isobel Sutherland, Karen Burns, Dr Ben Chandler, Kerry Elliott, Janine Mallinson, Alison Turnbull, Prisca Gondo, Bernard Hadebe, Abdul Kayani, Bridgett Masunda, Taya Anderson, Dan Hawcutt, Laura O'Malley, Laura Rad, Naomi Rogers, Paula Saunderson, Kathryn Sian Allison, Deborah Afolabi, Jennifer Whitbread, Dawn Jones, Rachael Dore, Matthew Halkes, Pauline Mercer, Lorraine Thornton, Joy Dawson, Sweyn Garrioch, Melanie Tolson, Jonathan Aldridge, Ritoo Kapoor, David Loader, Karen Castle, Sally Humphreys, Ruth Tampsett, Katherine Mackintosh, Amanda Ayers, Wendy Harrison, Julie North, Suzanne Allibone, Roman Genetu, Vidya Kasipandian, Amit Patel, Ainhi Mac, Anthony Murphy, Parisa Mahjoob, Roonak Nazari, Lucy Worsley, Andrew Fagan, Thomas Bemand, Ethel Black, Arnold Dela Rosa, Ryan Howle, Shaman Jhanji, Ravishankar Rao Baikady, Kate Colette Tatham, Benjamin Thomas, Dina Bell, Rosalind Boyle, Katie Douglas, Lynn Glass, Emma Lee, Liz Lennon, Austin Rattray, Abigail Taylor, Rachel Anne Hughes, Helen Thomas, Alun Rees, Michaela Duskova, Janet Phipps, Suzanne Brooks, Michelle Edwards, Sheena Quaid, Ekaterina Watson, Adam Brayne, Emma Fisher, Jane Hunt, Peter Jackson, Duncan Kaye, Nicholas Love, Juliet Parkin, Victoria Tuckey, Lynne Van Koutrik, Sasha Carter, Benedict Andrew, Louise Findlay, Katie Adams, Jen Service, Alison Williams, Claire Cheyne, Anne Saunderson, Sam Moultrie, Miranda Odam, Kathryn Hall, Isheunesu Mapfunde, Charlotte Willis, Alex Lyon, Chunda Sri-Chandana, Joslan Scherewode, Lorraine Stephenson, Sarah Marsh, John Hardy, Henry Houlden, Eleanor Moncur, Ambreen Tariq, Arianna Tucci, Maria Hobrok, Ronda Loosley, Heather McGuinness, Helen Tench, Rebecca Wolf-Roberts, Val Irvine, Benjamin Shelley, Claire Gorman, Abhinav Gupta, Elizabeth Timlick, Rebecca Brady, Barry Milligan, Arianna Bellini, Jade Bryant, Anton Mayer, Amy Pickard, Nicholas Roe, Jason Sowter, Alex Howlett, Katy Fidler, Emma Tagliavini, and Kevin Donnelly

Subjects
SARS-CoV-2, host genetics, toll-like receptor 7, targeted sequencing, rare variants, variant collapsing analysis, Genetics, QH426-470
Abstract

Summary: Despite extensive global research into genetic predisposition for severe COVID-19, knowledge on the role of rare host genetic variants and their relation to other risk factors remains limited. Here, 52 genes with prior etiological evidence were sequenced in 1,772 severe COVID-19 cases and 5,347 population-based controls from Spain/Italy. Rare deleterious TLR7 variants were present in 2.4% of young (

Published
2024
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12. Exposure to the early COVID‐19 pandemic and early, moderate and overall preterm births in the United States: A conception cohort approach

Author

Margerison, Claire E, Bruckner, Tim A, MacCallum‐Bridges, Colleen, Catalano, Ralph, Casey, Joan A, and Gemmill, Alison

Subjects
Paediatrics, Reproductive Medicine, Biomedical and Clinical Sciences, Pediatric, Infant Mortality, Preterm, Low Birth Weight and Health of the Newborn, Prevention, Perinatal Period - Conditions Originating in Perinatal Period, Reproductive health and childbirth, Good Health and Well Being, Pregnancy, Female, Infant, Newborn, United States, Humans, Premature Birth, Cross-Sectional Studies, Pandemics, COVID-19, Live Birth, COVID-19 pandemic, pregnancy, premature birth, time series, Paediatrics and Reproductive Medicine, Public Health and Health Services, Epidemiology, Reproductive medicine
Abstract

BackgroundThe United States (US) data suggest fewer-than-expected preterm births in 2020, but no study has examined the impact of exposure to the early COVID-19 pandemic at different points in gestation on preterm birth.ObjectiveOur objective was to determine-among cohorts exposed to the early COVID-19 pandemic-whether observed counts of overall, early and moderately preterm birth fell outside the expected range.MethodsWe used de-identified, cross-sectional, national birth certificate data from 2014 to 2020. We used month and year of birth and gestational age to estimate month of conception for birth. We calculated the count of overall (

Published
2023

13. Using Emerging Technology to Draw Learning across the Curriculum

Author

MacCallum, Kathryn, Rimmer, Tynneale, and Le Comte, Kay

Abstract

To drive the wider adoption of STEM in schools, researchers have promoted the benefits of teaching STEM subjects integrated across the curriculum. This integration can support more authentic learning opportunities where learning is framed in real-world application or driven through problem/project-based learning. The integration of digital technologies (DT), where the learning moves away from consumption to creation, provides for further application of learning where the development of artefacts can be situated within other subjects. This integration, however, raises new challenges for effective teaching and learning, and while new technologies and approaches can support this practice, this is still evolving. In this study we explore how one high school in New Zealand has integrated the creation of digital artefacts situated, in the digital technologies (DT) class, with learning in the Maori Performing Arts class. The study explores how mixed reality (MR), combined with design thinking approaches, provide new opportunities to integrate learning and support engagement in STEM. Drawing on a participatory action research methodology, this article explores the experiences and perceptions of three teachers as they adopt MR to engage and teach students drawing on critical DT skills.

Published
2021

15. Journal Production Guidance for Software and Data Citations

Author

Stall, Shelley, Bilder, Geoffrey, Cannon, Matthew, Chue Hong, Neil, Edmunds, Scott, Erdmann, Christopher C., Evans, Michael, Farmer, Rosemary, Feeney, Patricia, Friedman, Michael, Giampoala, Matthew, Hanson, R. Brooks, Harrison, Melissa, Karaiskos, Dimitris, Katz, Daniel S., Letizia, Viviana, Lizzi, Vincent, MacCallum, Catriona, Muench, August, Perry, Kate, Ratner, Howard, Schindler, Uwe, Sedora, Brian, Stockhause, Martina, Townsend, Randy, Yeston, Jake, and Clark, Timothy

Published
2023
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19. Recreational nitrous oxide and thrombotic events: a case series

Author

Ruth Dobson, Alastair Noyce, Peter MacCallum, Veronica White, Thomas H Massey, Joseph Walton, Devan Mair, Safiya A Zaloum, Marta Patyjewicz, Barbara Onen, Christine Joerres, Apeksha Madhusudan Shah, Tadbir Bariana, and Sarah A De Freitas

Subjects
Neurosciences. Biological psychiatry. Neuropsychiatry, RC321-571
Abstract

Background The study aimed to elucidate the prevalence of nitrous oxide (N2O) usage in patients with unexplained venous thromboembolism (VTE), highlighting the potential association with hyperhomocysteinaemia (HHcy).Methods We conducted a retrospective study at the Royal London Hospital, examining cases of N2O-related VTE from March to August 2023. Among 50 patients identified, four (8%) had recent unprovoked VTE. Patient data were collected based on N2O ambulatory emergency care pathway admissions.Results Among the 50 patients identified, four (8%) had recent or concurrent VTE. Three were male (75%), with an ethnic distribution of 50% Asian or Asian British and 50% Black or Black British. Patients were distributed across quintiles of the index of multiple deprivation. All had actual or functional vitamin B12 deficiency.Discussion The association between N2O use and VTE requires further investigation, though a plausible mechanism involving HHcy has been proposed. Clinicians should be vigilant for VTE in N2O users, especially those presenting with unexplained symptoms. VTE prophylaxis may be worth considering, particularly if continued exposure to nitrous oxide is anticipated.Conclusion N2O misuse may increase the risk of VTE, warranting attention from healthcare providers. Further research is needed to elucidate this association and inform preventive strategies. Public awareness about the risks of N2O remains essential.

Published
2024
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20. Chirality-induced zigzag domain wall in in-plane magnetized ultrathin films

Author

Chen, Gong, Robertson, MacCallum, Kwon, Heeyoung, Won, Changyeon, Schmid, Andreas K., and Liu, Kai

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science
Abstract

The domain structure in in-plane magnetized Fe/Ni/W(110) films is investigated using spin-polarized low-energy electron microscopy. A novel transition of the domain wall shape from a zigzag-like pattern to straight is observed as a function of the film thickness, which is triggered by the transition of the domain wall type from out-of-plane chiral wall to in-plane N\'eel wall. The contribution of the Dzyaloshinskii-Moriya interaction to the wall energy is proposed to explain the transition of the domain wall shape, which is supported by Monte-Carlo simulations., Comment: 12 pages, 3 figures

Published
2021
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21. Spacetimes with continuous linear isotropies III: null rotations

Author

MacCallum, M. A. H.

Subjects
General Relativity and Quantum Cosmology
Abstract

It is shown that in many cases local null rotation invariance of the curvature and its first derivatives is sufficient to ensure there is an isometry group G with dimension at least 3 acting on (a neighbourhood of) the spacetime and containing a null rotation isotropy. Invariance of the second derivatives is additionally required to ensure this conclusion in Petrov type N Einstein spacetimes, spacetimes containing "pure radiation" (a Ricci tensor of Segre type [(11,2)]), and conformally flat spacetimes with a Ricci tensor of Segre type [1(11,1)] (a "tachyon fluid")., Comment: Formatted for submission to General Relativity and Gravitation. Parts I and II accepted there and in press

Published
2021
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22. Transitions across Multi-Worlds: Experiences of Chinese International Doctoral Students in STEM Fields

Author

Yang, Yibo and MacCallum, Judith

Abstract

In the context of internationalization, this longitudinal qualitative study explores the diverse and challenging experiences of Chinese international doctoral students in science, technology, engineering, and mathematics. The endeavor is to identify factors that facilitate or constrain their successful completion of a PhD abroad over time. By incorporating a three-dimensional multi-world conceptual framework that highlights the relationship between an individual's research, personal, and social worlds, this study identified six patterns of congruence or difference across the worlds and the corresponding transitions, illustrated with narratives for each pattern. Evidence shows that congruence of an individual's multi-worlds facilitates, but difference does not necessarily mean constraint when differences are respected, understood, and accommodated. Rather, it is how the transitions are negotiated that is important for the success of transnational and transcultural PhD study. This article contributes a conceptual framework, empirical evidence, and practical implications to the understanding of doctoral study abroad experiences.

Published
2022
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23. Journal Production Guidance for Software and Data Citations

Author

Shelley Stall, Geoffrey Bilder, Matthew Cannon, Neil Chue Hong, Scott Edmunds, Christopher C. Erdmann, Michael Evans, Rosemary Farmer, Patricia Feeney, Michael Friedman, Matthew Giampoala, R. Brooks Hanson, Melissa Harrison, Dimitris Karaiskos, Daniel S. Katz, Viviana Letizia, Vincent Lizzi, Catriona MacCallum, August Muench, Kate Perry, Howard Ratner, Uwe Schindler, Brian Sedora, Martina Stockhause, Randy Townsend, Jake Yeston, and Timothy Clark

Subjects
Science
Abstract

Software and data citation are emerging best practices in scholarly communication. This article provides structured guidance to the academic publishing community on how to implement software and data citation in publishing workflows. These best practices support the verifiability and reproducibility of academic and scientific results, sharing and reuse of valuable data and software tools, and attribution to the creators of the software and data. While data citation is increasingly well-established, software citation is rapidly maturing. Software is now recognized as a key research result and resource, requiring the same level of transparency, accessibility, and disclosure as data. Software and data that support academic or scientific results should be preserved and shared in scientific repositories that support these digital object types for discovery, transparency, and use by other researchers. These goals can be supported by citing these products in the Reference Section of articles and effectively associating them to the software and data preserved in scientific repositories. Publishers need to markup these references in a specific way to enable downstream processes.

Published
2023
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24. Spacetimes with continuous linear isotropies II: boosts

Author

MacCallum, M. A. H.

Subjects
General Relativity and Quantum Cosmology
Abstract

Conditions are found which ensure that local boost invariance (LBI), invariance under a linear boost isotropy, implies local boost symmetry (LBS), i.e. the existence of a local group of motions such that for every point $P$ in a neighbourhood there is a boost leaving $P$ fixed. It is shown that for Petrov type D spacetimes this requires LBI of the Riemann tensor and its first derivative. That is also true for most conformally flat spacetimes, but those with Ricci tensors of Segre type [1(11,1)] may require LBI of the first three derivatives of curvature to ensure LBS., Comment: Title amended. This is the 'author's accepted manuscript'. To appear in General Relativity and Gravitation. In press. Paper I also in press. Paper III will follow

Published
2021
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25. Spacetimes with continuous linear isotropies I: spatial rotations

Author

MacCallum, M. A. H.

Subjects
General Relativity and Quantum Cosmology
Abstract

The weakest known criterion for local rotational symmetry (LRS) in spacetimes of Petrov type D is due to Goode and Wainwright (1986). Here it is shown, using methods related to the Cartan-Karlhede procedure, to be equivalent to local spatial rotation invariance of the Riemann tensor and its first derivatives. Conformally flat spacetimes are similarly studied and it is shown that for almost all cases the same criterion ensures LRS. Only for conformally flat accelerated perfect fluids are three curvature derivatives required to ensure LRS, showing that Ellis's original condition for that case is necessary as well as sufficient., Comment: Accepted for General Relativity and Gravitation. In press. Title was amended. This v2 is the 'author's accepted manuscript' version

Published
2021
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26. Observation of hydrogen-induced Dzyaloshinskii-Moriya interaction and reversible switching of magnetic chirality

Author

Chen, Gong, Robertson, MacCallum, Hoffmann, Markus, Ophus, Colin, Cauduro, Andre L. Fernandes, Conte, Roberto Lo, Ding, Haifeng, Wiesendanger, Roland, Blügel, Stefan, Schmid, Andreas K., and Liu, Kai

Subjects
Condensed Matter - Materials Science, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

The Dzyaloshinskii-Moriya interaction (DMI) has drawn great attention as it stabilizes magnetic chirality, with important implications in fundamental and applied research. This antisymmetric exchange interaction is induced by the broken inversion symmetry at interfaces or in non-centrosymmetric lattices. Significant interfacial DMI was found often at magnetic / heavy-metal interfaces with large spin-orbit coupling. Recent studies have shown promise of induced DMI at interfaces involving light elements such as carbon (graphene) or oxygen. Here we report direct observation of induced DMI by chemisorption of the lightest element, hydrogen, on a ferromagnetic layer at room temperature, which is supported by density functional theory calculations. We further demonstrate a reversible chirality transition of the magnetic domain walls due to the induced DMI via hydrogen chemisorption/desorption. These results shed new light on the understanding of DMI in low atomic number materials and design of novel chiral spintronics and magneto-ionic devices., Comment: 20 pages, 3 figures. 3 pages Supplemental Materials with 2 figures. To appear in Physical Review X

Published
2021
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27. Industry Practices, Processes and Techniques Adopted in Education: Supporting Innovative Teaching and Learning Practice

Author

MacCallum, Kathryn, Parsons, David, MacCallum, Kathryn, and Parsons, David

Abstract

This book provides a single source of reference for educators interested in understanding how industry-based ideas have been adapted into different educational contexts, and supports their utilisation in practice. The link between industry-based ideas and their application in education has enabled educators to develop engaging, collaborative, and creative learning environments, as well as better preparing their students for an increasingly complex and dynamic global environment. This book includes contributions from educators, researchers, and practitioners, who have integrated industry-based ideas into their teaching, and explores how these concepts and practices support the creation of effective learning environments. Through these diverse, international contributions, this book enables wider engagement with, and critical analysis of, the application of industry practices, processes and techniques in the development of collaborative and creative learning environments.

Published
2022
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28. Identification of the barriers and enablers for receiving a speaking up message: a content analysis approach

Author

Melanie Barlow, Kate J. Morse, Bernadette Watson, and Fiona Maccallum

Subjects
Speaking up, Receiver, Healthcare communication, Debrief, Simulation, Interprofessional education, Computer applications to medicine. Medical informatics, R858-859.7
Abstract

Abstract Background Within healthcare, the barriers and enablers that influence clinicians’ ability to speak up are well researched. However, despite the receiver of the message being identified as a key barrier to a speaker voicing a concern, there have been very few receiver-focused studies. As a result, little is known about the barriers and enablers that influence message reception. Understanding these can help inform speaking up training and ultimately enhance patient safety through more effective clinical communication. Objectives To identify enabling or inhibiting factors that influence the receiver’s reception and response to a speaking up message, and if the identified barriers and enablers are related to speaker or receiver characteristics. Design and methods Twenty-two interdisciplinary simulations were video recorded and transcribed. Simulation participants formed the patient discharge team and were receivers of a speaking up message, delivered by a nurse at the patient’s bedside. How the message was delivered (verbose or abrupt wording), was manipulated and counterbalanced across the simulations. Within the post simulation debriefs, barriers and enablers of being a receiver of a message were explored using content analysis. Setting/participants This study took place in a large Australian tertiary healthcare setting. Participants were qualified clinicians of varying disciplines and specialties. Results A total of 261 barriers and 285 enablers were coded. Results showed that how the message was delivered (differing tone, phases, and manner) influenced what receivers identified as barriers and enablers. Additionally, the receiver’s own cognitive processes, such as making positive attributions of the speaker and attempting to build rapport and collegiality, better enabled message reception and response. Receiver behaviour was negatively impacted by listening to fix, rather than understand, and not knowing in the moment how to manage their own reactions and appropriately frame a response. Conclusion The debriefings identified key barriers and enablers to receiving a speaking up message that differ from those previously identified for senders of the speaking up message. Current speaking up programs are predominately speaker centric. This study identified that both speaker and receiver behaviour influenced message reception. Therefore, training must place equal attention on both the speaker and receiver and be inclusive of experiential conversational rehearsal of both positive and challenging encounters.

Published
2023
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29. A short pre-conception bout of predation risk affects both children and grandchildren

Author

Sriya Bhattacharya, Phillip E. MacCallum, Mrunal Dayma, Andrea McGrath-Janes, Brianna King, Laura Dawson, Francis R. Bambico, Mark D. Berry, Qi Yuan, Gerard M. Martin, Evan L. Preisser, and Jacqueline J. Blundell

Subjects
Medicine, Science
Abstract

Abstract Traumatic events that affect physiology and behavior in the current generation may also impact future generations. We demonstrate that an ecologically realistic degree of predation risk prior to conception causes lasting changes in the first filial (F1) and second filial (F2) generations. We exposed male and female mice to a live rat (predator stress) or control (non-predator) condition for 5 min. Ten days later, stressed males and females were bred together as were control males and females. Adult F1 offspring from preconception-stressed parents responded to a mild stressor with more anxiety-like behavior and hyperarousal than offspring from control parents. Exposing these F1 offspring to the mild stressor increased neuronal activity (cFOS) in the hippocampus and altered glucocorticoid system function peripherally (plasma corticosterone levels). Even without the mild stressor, F1 offspring from preconception-stressed parents still exhibited more anxiety-like behaviors than controls. Cross-fostering studies confirmed that preconception stress, not maternal social environment, determined offspring behavioral phenotype. The effects of preconception parental stress were also unexpectedly persistent and produced similar behavioral phenotypes in the F2 offspring. Our data illustrate that a surprisingly small amount of preconception predator stress alters the brain, physiology, and behavior of future generations. A better understanding of the ‘long shadow’ cast by fearful events is critical for understanding the adaptive costs and benefits of transgenerational plasticity. It also suggests the intriguing possibility that similar risk-induced changes are the rule rather than the exception in free-living organisms, and that such multigenerational impacts are as ubiquitous as they are cryptic.

Published
2023
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30. Why a distinct medical stream is necessary to support patients using cannabis for medical purposes

Author

Cecilia Costiniuk, Caroline A. MacCallum, Michael Boivin, Sergio Rueda, Gary Lacasse, Zach Walsh, Paul J. Daeninck, Shari Margolese, Enrico Mandarino, Jagpaul Kaur Deol, Tatiana Sanchez, and Alan D. Bell

Subjects
Cannabis, Cannabinoid-based medicine, Medical cannabis, Access, Pharmacy and materia medica, RS1-441, Plant culture, SB1-1110
Abstract

Abstract Background Since 2001, Canadians have been able to obtain cannabis for medical purposes, initially through the Access to Cannabis for Medical Purposes Regulations (ACMPR). The Cannabis Act (Bill C-45) came into force on October 17, 2018, replacing the ACMPR. The Cannabis Act enables Canadians to possess cannabis purchased from a licensed retailer without authorization for either medical or nonmedical purposes. The Cannabis Act is currently the guiding legislation which governs both medical and nonmedical access. The Cannabis Act contains some improvements for patients but is essentially the same as its previous legislation. Beginning in October 2022, the federal government is conducting a review of the Cannabis Act and is questioning whether a distinct medical cannabis stream is still required, given the ease of access to cannabis and cannabis products. Although there is overlap in the reasons for medical and recreational cannabis use, the distinct legislation of medical versus recreational use of cannabis in Canada may be under threat. Main body A large segment of the medical, academic, research, and lay communities agree that there is a need for distinct medical and recreational cannabis streams. Perhaps most importantly, separation of these streams is necessary to ensure that both medical cannabis patients and healthcare providers receive the required support needed to optimize benefits while minimizing risks associated with medical cannabis use. Preservation of distinct medical and recreational streams can help to ensure that needs of different stakeholders are met. For example, patients require guidance in the form of assessing the appropriateness of cannabis use, selection of appropriate products and dosage forms, dosing titration, screening for drug interactions, and safety monitoring. Healthcare providers require access to undergraduate and continuing health education as well as support from their professional organizations to ensure medical cannabis is appropriately prescribed. Although there are challenges in conducing research, as motives for cannabis use frequently straddle boundaries between medical versus recreational cannabis use, maintenance of a distinct medical stream is also necessary to ensure adequate supply of cannabis products appropriate for medical use, to reduce stigma associated with cannabis in both patients and providers, to help enable reimbursement for patients, to facilitate removal of taxation on cannabis used for medical purposes, and to promote research on all aspects of medical cannabis. Conclusion Cannabis products for medical and recreational purposes have different objectives and needs, requiring different methods of distribution, access, and monitoring. HCPs, patients, and the commercial cannabis industry would serve Canadians well to continue to advocate to policy makers to ensure the continued existence of two distinct streams and must strive to make ongoing improvements to the current programs.

Published
2023
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31. Exploring medical cannabis use in individuals with a traumatic brain injury

Author

Elizabeth N. R. Schjelderup, Caroline A. MacCallum, Lindsay A. Lo, Jessie Dhillon, April Christiansen, Carly Pistawka, Kathryn Rintoul, William J. Panenka, and Alasdair M. Barr

Subjects
cannabis, chart review, traumatic brain injury, symptoms, neuropsychiatric, Other systems of medicine, RZ201-999
Abstract

Aim: Traumatic brain injury (TBI) is a common neurological condition, which can present with a wide range of neuropsychological symptoms. Treating this broad spectrum of symptoms represents a significant medical challenge. In part because of this, there is growing interest in the use of medical cannabis to treat the sequelae of TBI, as medical cannabis has been used to treat multiple associated conditions, such as pain. However, medical cannabis represents a heterogeneous collection of therapies, and relatively little is known about their effectiveness in treating TBI symptoms. The aim of the present study was therefore to assess medical cannabis use in patients with TBI. Methods: In the present study, a retrospective chart review was conducted of patterns of cannabis use and TBI symptoms in individuals who used medical cannabis to treat TBI-related symptoms. All subjects were recruited from a medical cannabis clinic, where cannabis was authorized by physicians, using licensed cannabis products. A total of 53 subjects provided written consent to have their charts reviewed. Results: Neuropsychiatric conditions, including depression, pain, and anxiety were frequent in this group. The most common forms of medical cannabis consumption at intake included smoking, vaping, and oral ingestion. Patients used a combination of high tetrahydrocannabinol (THC)/low cannabidiol (CBD) and low THC/high CBD products, typically 1–3 times per day. Medical cannabis appeared to be relatively well-tolerated in subjects, with few serious side effects. At follow-up, subjects self-reported improvements in TBI symptoms, although these were not statistically significant when assessed using validated questionnaires. Conclusions: Overall findings indicate modest potential benefits of medical cannabis for TBI, but further research will be required to validate these results.

Published
2023
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32. Recommendations for accelerating open preprint peer review to improve the culture of science.

Author

Michele Avissar-Whiting, Frédérique Belliard, Stefano M Bertozzi, Amy Brand, Katherine Brown, Géraldine Clément-Stoneham, Stephanie Dawson, Gautam Dey, Daniel Ecer, Scott C Edmunds, Ashley Farley, Tara D Fischer, Maryrose Franko, James S Fraser, Kathryn Funk, Clarisse Ganier, Melissa Harrison, Anna Hatch, Haley Hazlett, Samantha Hindle, Daniel W Hook, Phil Hurst, Sophien Kamoun, Robert Kiley, Michael M Lacy, Marcel LaFlamme, Rebecca Lawrence, Thomas Lemberger, Maria Leptin, Elliott Lumb, Catriona J MacCallum, Christopher Steven Marcum, Gabriele Marinello, Alex Mendonça, Sara Monaco, Kleber Neves, Damian Pattinson, Jessica K Polka, Iratxe Puebla, Martyn Rittman, Stephen J Royle, Daniela Saderi, Richard Sever, Kathleen Shearer, John E Spiro, Bodo Stern, Dario Taraborelli, Ron Vale, Claudia G Vasquez, Ludo Waltman, Fiona M Watt, Zara Y Weinberg, and Mark Williams

Subjects
Biology (General), QH301-705.5
Abstract

Peer review is an important part of the scientific process, but traditional peer review at journals is coming under increased scrutiny for its inefficiency and lack of transparency. As preprints become more widely used and accepted, they raise the possibility of rethinking the peer-review process. Preprints are enabling new forms of peer review that have the potential to be more thorough, inclusive, and collegial than traditional journal peer review, and to thus fundamentally shift the culture of peer review toward constructive collaboration. In this Consensus View, we make a call to action to stakeholders in the community to accelerate the growing momentum of preprint sharing and provide recommendations to empower researchers to provide open and constructive peer review for preprints.

Published
2024
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33. In-plane N\'eel wall chirality and orientation of interfacial Dzyaloshinskii-Moriya vector in magnetic films

Author

Robertson, MacCallum, Agostino, Christopher J., Chen, Gong, Kang, Sang Pyo, Mascaraque, Arantzazu, Michel, Enrique Garcia, Won, Changyeon, Wu, Yizheng, Schmid, Andreas K., and Liu, Kai

Subjects
Condensed Matter - Materials Science, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

The interfacial Dzyaloshinskii-Moriya interaction (DMI) is of great interest as it can stabilize chiral spin structures in thin films. Experiments verifying the orientation of the interfacial DMI vector remain rare, in part due to the difficulty of separating vector components of DMI. In this study, Fe/Ni bilayers and Co/Ni multilayers were deposited epitaxially onto Cu(001) and Pt(111) substrates, respectively. By tailoring the effective anisotropy, spin reorientation transitions (SRTs) are employed to probe the orientation of the DMI vector by measuring the spin structure of domain walls on both sides of the SRTs. The interfacial DMI is found to be sufficiently strong to stabilize chiral N\'eel walls in the out-of-plane magnetized regimes, while achiral N\'eel walls are observed in the in-plane magnetized regimes. These findings experimentally confirm that the out-of-plane component of the DMI vector is insignificant in these fcc(001) and fcc(111) oriented interfaces, even in the presence of atomic steps., Comment: 19 pages, 5 figures

Published
2020
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34. Totally symmetrized spinors and null rotation invariance

Author

MacCallum, Malcolm A. H.

Subjects
General Relativity and Quantum Cosmology
Abstract

In the existing implementations of the Cartan-Karlhede procedure for characterization and classification of spacetimes, a prominent r\^ole is played by multi-index two-component spinors symmetrized over both types of index. This paper considers the conditions for, and detection of, null rotational invariance of such spinors, and corrects a previous discussion., Comment: Text revised after refereeing. This version accepted in Classical and Quantum Gravity and now available online under CC BY 3.0 licence

Published
2020
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35. Cosmological models from a geometric point of view

Author

MacCallum, M. A. H.

Subjects
General Relativity and Quantum Cosmology, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

(There is no original abstract.) These are lecture notes from a 1971 summer school surveying the then known cosmological models in particular the properties of Bianchi cosmologies, and giving a pedagogical introduction to groups of isometries in spacetime and to the orthonormal tetrad method., Comment: These notes have been widely cited, but were not readily available. The copyright is held by Taylor and Francis who now own Gordon and Breach and whose permission must be sought for any uses demanding copyright. They have given permission for posting to archives, for which I am grateful, saying "Given that the material was pre-digital you are permitted to scan and post the printed original."

Published
2020

36. Tunable Nanoscale Systems: Magnetic Thin films, Spin Textures, and Superconducting Devices

Author

Robertson, MacCallum

Subjects
Condensed matter physics, Nanoscience, Materials Science, Magnetism, Spin textures, Superconductivity, Thin films
Abstract

Nanoscale devices have taken center stage in both academic research and industry, bringing with them the need for fabrication, characterization, and understanding of tunable systems for device applications. Here I will discuss the fabrication, characterization, and future application of magnetic thin film systems, tunable hydrogen adsorption/desorption on transition metal thin films, and electrically tunable superconductivity in thin film YBCO devices. With the advancement of modern nanomagnetics and spintronics, the ability to control and tailor spin textures have become the focus of intense research interest. A spin-polarized low-energy electron microscope (SPLEEM) is used to both fabricate and characterize in-situ certain thin film magnetic systems, enabling studies including observing the nature of magnetic chirality within in-plane magnetized systems, as well as investigating induced perpendicular-magnetic anisotropy as a function of material topography. Similar techniques are used to fabricate and measure transition metal thin film systems and their hydrogen adsorption/desorption properties. Metals such as Ni, Pd, and Cs are added to the thin film surfaces to adjust the hydrogen adsorption/desorption characteristics without significantly affecting the physical or chemical properties of the film. Monolayer to submonolayer thicknesses of these metal overlayers were shown to result in H adsorption enhancement, adjustable H reversibility (adsorption/desorption ratio), H exclusion (adsorption suppression), and H trapping (desorption suppression), enabling a wide range of tunability over how H interacts with a thin film surface.

Published
2024

37. Experiences and Reflections of Teachers on the Use of Mixed Reality Technologies to Foster Cross-Curricular Learning Opportunities

Author

Teaching and Learning Research Initiative (New Zealand) and MacCallum, Kathryn

Abstract

Recent changes to the Technology learning areas of "The New Zealand Curriculum" drove the motivation for this research project. The changes to the curriculum were designed to support students to develop the digital literacies vital to engage in an increasingly digital society (Ministry of Education, 2017). The need to attract more students into digital technologies was also a driver for these changes and it resulted in the strengthening of the digital technologies | hangarau matihiko (DT|HM) curriculum content with two areas being added to the Technology strand of the curriculum: computational thinking (DTCT), and designing and developing digital outcomes (DDDO). This study aimed to explore how the purposeful integration of new technology, specifically mixed reality (MR), can support learning across the curriculum through the development of digital artefacts. The study focused on exploring the experiences of teachers at two high schools who were supported by digital technologies teachers and the lead researcher to use digital technologies with students to create MR artefacts in different subject areas.

Published
2022

38. Integrating Mobile Mixed Reality to Enhance Learning before, during, and after Physical Field Trips

Author

MacCallum, Kathryn and Parsons, David

Abstract

Physical field trips have long been used in education, but virtual field trips are increasingly being used to enhance them. This article focuses on the use of mixed reality to enhance a physical field trip before, during, and after the field experience as part of a project in teacher professional development. The context is a field trip to a landfill site, where students learn about waste management, recycling, and sustainability. Building on several different themes from the literature to create a single model of pre-, intra-, and post-field trip digital learning activities, three scenarios are outlined: One where a virtual field trip is used prior to a physical field trip to prepare students for their visit, a second where an augmented reality experience is used during the physical field trip, and a third where students build on their experience of virtual reality to create their own virtual tours. The article highlights how mobile mixed reality offers new ways to deepen the field trip learning experience through student- and teacher-created digital artifacts.

Published
2022
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39. A Three-Dimensional Multi-World Framework for Examining Cross-Cultural Experiences of International Doctoral Students

Author

Yang, Yibo and MacCallum, Judith

Abstract

With the trend of student mobility, talented individuals have been pursuing doctoral education opportunities abroad. Prior research addressed specific aspects or challenges of doing a PhD in a cross-cultural context, leaving a need to understand the nature of students' experiences from a holistic perspective. To address the need, this study develops a framework that conceptualises an international doctoral student's research, personal, and social worlds as multi-worlds, highlighting transitions across the worlds that make a difference in student experiences. It also structures the continuous, interactive, and situative nature of study abroad as a three-dimensional space to encompass the multi-worlds and transitions across and over time. Illustrated by one international student's in-depth narrative inquiry, this framework offers both theoretical insights and practical approaches to the comprehensive understanding of PhD abroad experiences.

Published
2022
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40. Investigating the Classroom Environment with Physical Computing

Author

Parsons, David and MacCallum, Kathryn

Abstract

To integrate digital technologies into the curriculum, teachers must support learners to use digital tools in authentic contexts. Physical computing, which involves the use of small portable electronic devices, provides an opportunity to achieve these goals. This article reports on the initial stages of a design-based research (DBR) project that will enable students to monitor and investigate their own learning spaces, with a focus on the impacts on their own well-being, and to propose solutions to any issues that they identify. The study focuses on a series of workshops, run with staff from an educational organisation, designed to explore environmental monitoring in the classroom and identify opportunities to apply the theory of situated cognition to authentic learning in context. The article reports on the first two phases of the DBR approach, defining the project focus and understanding the problem, to propose and refine a set of five design principles. The insights gained will be used in the subsequent phases of the DBR process.

Published
2022
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41. Researching Skills Development: Students as Partners in This Process

Author

Casey, Samantha Campbell, MacCallum, Janis, Robertson, Lynn, and Strachan, Lewis

Abstract

Many employers report that newly qualified graduates lack key skills necessary for success in the workplace. Although variable, many lack general 'transferable' or 'soft' skills including communication and teamworking. Staff at Edinburgh Napier University have sought to address this using the Skills Passport tool. The main element of the Skills Passport is the Skills Evidence Evaluation Record (SEER), which encourages students to document and reflect on their skills throughout their time at university in preparation for employment. The purpose of this study was to explore students' awareness of, and attitudes towards, their own skills development. Two final year students were recruited to the project and collected data from first to fourth year students via a questionnaire they designed to gather data about the Skills Passport and skills development as part of their final year project. In addition, an employer focus group and individual interviews gathered the thoughts of employers regarding graduates' skills sets and the skills important to them as employers. Students were aware that transferable skills are highly desirable, and that extracurricular activities are important; they become increasingly concerned about their skills development as they progress through their studies. These results suggest that students are aware of and are willing to invest extra time in their skills development, but that they require further support from the institution in order to be more confident about future employment prospects.

Published
2018

42. Large Dzyaloshinskii-Moriya interaction induced by chemisorbed oxygen on a ferromagnet surface.

Author

Chen, Gong, Mascaraque, Arantzazu, Jia, Hongying, Zimmermann, Bernd, Robertson, MacCallum, Conte, Roberto Lo, Hoffmann, Markus, González Barrio, Miguel Angel, Ding, Haifeng, Wiesendanger, Roland, Michel, Enrique G, Blügel, Stefan, Schmid, Andreas K, and Liu, Kai

Abstract

The Dzyaloshinskii-Moriya interaction (DMI) is an antisymmetric exchange interaction that stabilizes chiral spin textures. It is induced by inversion symmetry breaking in noncentrosymmetric lattices or at interfaces. Recently, interfacial DMI has been found in magnetic layers adjacent to transition metals due to the spin-orbit coupling and at interfaces with graphene due to the Rashba effect. We report direct observation of strong DMI induced by chemisorption of oxygen on a ferromagnetic layer at room temperature. The sign of this DMI and its unexpectedly large magnitude-despite the low atomic number of oxygen-are derived by examining the oxygen coverage-dependent evolution of magnetic chirality. We find that DMI at the oxygen/ferromagnet interface is comparable to those at ferromagnet/transition metal interfaces; it has enabled direct tailoring of skyrmion's winding number at room temperature via oxygen chemisorption. This result extends the understanding of the DMI, opening up opportunities for the chemisorption-related design of spin-orbitronic devices.

Published
2020

43. The influence of professional identity on how the receiver receives and responds to a speaking up message: a cross-sectional study

Author

Melanie Barlow, Bernadette Watson, Elizabeth Jones, Fiona Maccallum, and Kate J. Morse

Subjects
Speaking up, Receiver, Communication accommodation theory, Healthcare communication, Safety voice, Social identity, Nursing, RT1-120
Abstract

Abstract Background Research focused on understanding what enables or hinders health professionals to speak up about a safety concern has been to date predominately atheoretical and speaker focused. However, the role the receiver of the message plays in these often-difficult encounters is highly influential. To date, speaking up programs have created conversational mnemonics that technically should respectfully engage the receiver, yet speaking up remains challenging. This paper utilises Communication Accommodation Theory to explore the impact the communication behaviour and speaker characteristics has on the receiver of a speaking up message, and if these impacts differ between receiver groups (clinical disciplines). Method Clinicians (N = 208) from varying disciplines responded to two hypothetical speaking up vignettes, where participants were the receivers of speaking up messages. Analysis of variance was used to explore any potential differences between receiver groups. Results Findings indicated that the level of perceived accommodation and group membership, whether defined by speaker discipline or seniority, collectively influenced how the receiver of a speaking up message evaluated the interaction, which influenced their anticipated response to the speaker. Conclusions The receiver’s perceptions and evaluations of the message, their own professional identity and the presence of others, influenced receivers’ anticipated responses. This has direct implications on healthcare speaking up training and provision of care, as the varying clinical disciplines received and responded to the same messages differently.

Published
2023
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45. Critical Links between Arts Activity Participation, School Satisfaction and University Expectation for Australian High School Students

Author

Geagea, Antoinette, MacCallum, Judith, Vernon, Lynette, and Barber, Bonnie L.

Abstract

Positive school experiences increase school satisfaction and educational aspirations and are important developmental opportunities for adolescents. Associations between time-varying school-based arts participation, students' school satisfaction and university expectation were investigated using data collected from 1,215 students in 29 Western Australian high schools. Associations between school-based arts participation and school satisfaction, and school-based arts participation and university expectation were tested using latent growth curve analyses. Positive associations were found between school-based arts participation and time-specific variations in school satisfaction and university expectation in each year of activity participation. Higher levels of school satisfaction and university expectation were reported above and beyond individual-specific underlying developmental trajectory for these outcomes, controlling for socioeconomic status. Policy implications and practice are discussed in the context of arts provision for Australian schools.

Published
2017

48. Single Crystal Permanent Magnet: Extraordinary Magnetic Behavior in the ta, Cu and Fe Substituted CeCo5 System

Author

Lamichhane, Tej N., Onyszczak, Michael T., Palasyuk, Olena, Sharikadze, Saba, Kim, Tae-Hoon, Kramer, Matthew J., MacCallum, R. W., Wysocki, Aleksander L., Nguyen, Manh Cuong, Antropov, Vladimir P., Pandey, Tribhuvan, Parker, David, Bud'ko, Sergey L., Canfield, Paul C., and Palasyuk, Andriy

Subjects
Condensed Matter - Materials Science
Abstract

To reduce material and processing costs of commercial permanent magnets and to attempt to fill the empty niche of energy products, 10 - 20 MGOe, between low-flux (ferrites, alnico) and high-flux (Nd2Fe14B- and SmCo5-type) magnets, we report synthesis, structure, magnetic properties and modeling of Ta, Cu and Fe substituted CeCo5. Using a self-flux technique, we grew single crystals of I - Ce15.1Ta1.0Co74.4Cu9.5, II - Ce16.3Ta0.6Co68.9Cu14.2, III - Ce15.7Ta0.6Co67.8Cu15.9, IV - Ce16.3Ta0.3Co61.7Cu21.7 and V - Ce14.3Ta1.0Co62.0Fe12.3Cu10.4. X-ray diffraction analysis (XRD) showed that these materials retain a CaCu5 substructure and incorporate small amounts of Ta in the form of \dumb-bells", filling the 2e crystallographic sites within the 1D hexagonal channel with the 1a Ce site, whereas Co, Cu and Fe are statistically distributed among the 2c and 3g crystallographic sites. Scanning electron microscopy, energy dispersive X-ray spectroscopy (SEM-EDS) and scanning transmission electron microscopy (STEM) examinations provided strong evidence of the single-phase nature of the as-grown crystals, even though they readily exhibited significant magnetic coercivitie of ~1.6 - ~1.8 kOe caused by Co-enriched, nano-sized, structural defects and faults that can serve as pinning sites. Formation of the "composite crystal" during the heat treatment creates a 3D array of extended defects within a primarily single grain single crystal, which greatly improves its magnetic characteristics. Possible causes of the formation of the "composite crystal" may be associated with Ta atoms leaving matrix interstices at lower temperatures and/or matrix degradation induced by decreased miscibility at lower temperatures. Fe strongly improves both the Curie temperature and magnetization of the system resulting in (BH)max:~13 MGOe at room temperature., Comment: 17 pages, 18 figures

Published
2018
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