Coordination Matters : Interpersonal Synchrony Influences Collaborative Problem-Solving

The authors thank Martha von Werthern and Caitlin Taylor for their assistance with data collection, Cathy Macpherson for her assistance with the preparation of the manuscript, and Mike Richardson, Alex Paxton, and Rick Dale for providing MATLAB code to assist with data analysis. The research was funded by the British Academy (SG131613).Peer reviewedPublisher PD

High speed synchrotron X-ray imaging studies of the ultrasound shockwave and enhanced flow during metal solidification processes

The highly dynamic behaviour of ultrasonic bubble implosion in liquid metal, the multiphase liquid metal flow containing bubbles and particles, and the interaction between ultrasonic waves and semisolid phases during solidification of metal were studied in situ using the complementary ultrafast and high speed synchrotron X-ray imaging facilities housed respectively at the Advanced Photon Source, Argonne National Laboratory, US, and Diamond Light Source, UK. Real-time ultrafast X-ray imaging of 135,780 frames per second (fps) revealed that ultrasonic bubble implosion in a liquid Bi-8 wt. %Zn alloy can occur in a single wave period (30 kHz), and the effective region affected by the shockwave at implosion was 3.5 times the original bubble diameter. Furthermore, ultrasound bubbles in liquid metal move faster than the primary particles, and the velocity of bubbles is 70 ~ 100% higher than that of the primary particles present in the same locations close to the sonotrode. Ultrasound waves can very effectively create a strong swirling flow in a semisolid melt in less than one second. The energetic flow can detach solid particles from the liquid-solid interface and redistribute them back into the bulk liquid very effectively

Electrical studies of Barkhausen switching noise in ferroelectric PZT : critical exponents and temperature dependence

This work at St Andrews was supported by EPSRC grant EP/P024637/1. EKHS thanks EPSRC for support.Crackling noise of ferroelectric lead zirconate titanate samples during ferroelectric switching is demonstrated to be compatible with avalanche statistics. The peaks of the slew rate (time derivative of current dI/dt squared), defined as "jerks," were statistically analyzed and shown to obey power laws. The critical exponent obtained is 1.64 ± 0.15, in agreement with predictions from avalanche theory. The exponent is independent of temperature within experimental error margins.PostprintPeer reviewe

Smartphone and medical related App use among medical students and junior doctors in the United Kingdom (UK): a regional survey

Background: Smartphone usage has spread to many settings including that of healthcare with numerous potential and realised benefits. The ability to download custom-built software applications (apps) has created a new wealth of clinical resources available to healthcare staff, providing evidence-based decisional tools to reduce medical errors. Previous literature has examined how smartphones can be utilised by both medical student and doctor populations, to enhance educational and workplace activities, with the potential to improve overall patient care. However, this literature has not examined smartphone acceptance and patterns of medical app usage within the student and junior doctor populations. Methods: An online survey of medical student and foundation level junior doctor cohorts was undertaken within one United Kingdom healthcare region. Participants were asked whether they owned a Smartphone and if they used apps on their Smartphones to support their education and practice activities. Frequency of use and type of app used was also investigated. Open response questions explored participants’ views on apps that were desired or recommended and the characteristics of apps that were useful. Results: 257 medical students and 131 junior doctors responded, equating to a response rate of 15.0% and 21.8% respectively. 79.0% (n=203/257) of medical students and 74.8% (n=98/131) of junior doctors owned a smartphone, with 56.6% (n=115/203) of students and 68.4% (n=67/98) of doctors owning an iPhone. The majority of students and doctors owned 1–5 medical related applications, with very few owning more than 10, and iPhone owners significantly more likely to own apps (Chi sq, p<0.001). Both populations showed similar trends of app usage of several times a day. Over 24hours apps were used for between 1–30 minutes for students and 1–20 minutes for doctors, students used disease diagnosis/management and drug reference apps, with doctors favouring clinical score/calculator apps. Conclusions: This study found a high level of smartphone ownership and usage among medical students and junior doctors. Both groups endorse the development of more apps to support their education and clinical practice

Can forest management based on natural disturbances maintain ecological resilience?

Given the increasingly global stresses on forests, many ecologists argue that managers must maintain ecological resilience: the capacity of ecosystems to absorb disturbances without undergoing fundamental change. In this review we ask: Can the emerging paradigm of natural-disturbance-based management (NDBM) maintain ecological resilience in managed forests? Applying resilience theory requires careful articulation of the ecosystem state under consideration, the disturbances and stresses that affect the persistence of possible alternative states, and the spatial and temporal scales of management relevance. Implementing NDBM while maintaining resilience means recognizing that (i) biodiversity is important for long-term ecosystem persistence, (ii) natural disturbances play a critical role as a generator of structural and compositional heterogeneity at multiple scales, and (iii) traditional management tends to produce forests more homogeneous than those disturbed naturally and increases the likelihood of unexpected catastrophic change by constraining variation of key environmental processes. NDBM may maintain resilience if silvicultural strategies retain the structures and processes that perpetuate desired states while reducing those that enhance resilience of undesirable states. Such strategies require an understanding of harvesting impacts on slow ecosystem processes, such as seed-bank or nutrient dynamics, which in the long term can lead to ecological surprises by altering the forest's capacity to reorganize after disturbance

The Vehicle, Spring 1984

Vol. 25, No. 2 Table of Contents The OpeningKathy Fordpage 3 PaintThomas B. Waltrippage 3 PhotographLisa Fresepage 4 City as Castigating AnimalJerry McAnultypage 5 LimitsMichelle Mitchellpage 6 In SilenceKeila Tooleypage 6 PhotographLisa Fresepage 7 Indian CreekJerry McAnultypage 8 The Right Idea about RainMichelle Mitchellpage 8 Van Gogh\u27s Young Male PeasantKeila Tooleypage 9 AbigailMaggie Kennedypage 9 CleaningJennifer K. Soulepage 10 Heat WaveJerry McAnultypage 11 VigilJanet Gracepage 11 Hatred of ClownsMichelle Mitchellpage 12 Trees in the YardKeila Tooleypage 13 Lost on Back RoadsToby Mirabellipage 13 The Death of My Father\u27s HandsGina Grillopage 14 Soft LandingMaggie Kennedypage 14 Incident in the Generic AisleMaggie Kennedypage 15 Happy Well-adjusted Individuals, ConsideringJennifer K. Soulepage 16 Old ManGina Grillopage 17 It Doesn\u27t MatterTed Boonepage 18 A Love Poem for Charles DonaldCathy Moepage 18 David Willey at Whitman WharfSue Oiler Millerpage 19 I Am the ArtsBrenda Renee Drummerpage 20 Mothers and DaughtersJennifer K. Soulepage 22 ScratchesMichelle Mitchellpage 26 SedativeStacey Flanniganpage 26 Calloused HandJanet Gracepage 27 Cool CatStacey Flanniganpage 27 For My History Teacher, Miss WilhelmCathy Moepage 28 Short Poem for Chris\u27s EyesBob Zordanipage 28 MissingMichelle Mitchellpage 29 Over ThereGraham Lewispage 30 Strange BedfellowsMaggie Kennedypage 31 Retired PlumberMichelle Mitchellpage 32 Rumors of War DeadKathy Fordpage 33 Night LightsKeila Tooleypage 33 Fish on the Train TracksJerry McAnultypage 34 DaddyKeily Tooleypage 34 A Message to the MessengerAmy Eadespage 35 Dancing AloneKathy Bowerpage 36 HandsMaggie Kennedypage 36 The Key to the Ladies\u27s RoomMichelle Mitchellpage 37 Crashing the BlueStacey Flanniganpage 37 The Cradle will FallMichelle Mitchellpate 38 One IslandKeila Tooleypage 38 Black Walnut PaintSue Oiler Millerpage 39 SerendipityGraham Lewispage 40 Cover ArtLisa Fresehttps://thekeep.eiu.edu/vehicle/1045/thumbnail.jp

Effect of input power and temperature on the cavitation intensity during the ultrasonic treatment of molten aluminium

Experimental results of ultrasonic processing of liquid aluminium with a 5 kW magnetostrictive transducer and a 20 mm titanium sonotrode excited at 17 kHz are reported in this study. A unique high-temperature cavitometer sensor, placed at various locations in the liquid melt, measured cavitation activity at various acoustic power levels and different temperature ranges. The highest cavitation intensity in the liquid bulk is achieved below the surface of the sonotrode, at the lowest temperature and with an applied power of 3.5 kW. This two-fold mechanism is related to (a) acoustic shielding and (b) the tendency of liquid aluminium to release hydrogen when the temperature drops, thus promoting multiple cavitation events. Understanding these mechanisms in liquid metals can result in a major breakthrough for the optimization of ultrasound applications to liquid metal processing.This work is performed within the Ultramelt Project supported by the EPSRC Grants EP/K005804/1 and EP/K00588X/1