314 research outputs found
Abbott, Chijoke, Dandelion, & Oliver\u27s Historical Dictionmy of the Friends (Quakers) - Book Review
Resisting the Inevitable: Universal and Particular Salvation In the Thought of Robert Barclay
Woo-Hoo! The Mathematics and Education of the Dâoh-Nut A Review of Simon Singhâs The Simpsons and Their Mathematical Secrets
I am a mathematics educator working in a Faculty of Education, at a mid-sized university. I have degrees in mathematics, teaching, and education related to the teaching and learning of mathematics. I also have twenty years of experience with school boards as a secondary school mathematics teacher and department head. It is from these experiences, knowledge, and professional practice that I approached this book reviewâfrom a place of how I see the world around me and work to understand it. I love thinking about and working to understand teachersâ beliefs, problem solving, and professional learning in problem solving contexts, and thus my secondary school teacher âselfâ, or identity, is quite interconnected to my mathematics education researcher âself, or identity
Exploration de la nature et de lâobjectif des rĂ©troactions donnĂ©es lors du visionnement de vidĂ©os dans le cadre dâun cours sur la laparoscopie en gynĂ©cologie
Background: Feedback about intraoperative performance remains a cornerstone of surgical training. Video playback offers one potential method for more effective feedback to surgical residents. More research is needed to better understand this method. This study explores the nature of instructional interactions and feedback in the operating room (OR) and when using video playback during post-operative review in obstetrics and gynecology (OBGYN) training.
Method: This case study occurred between September 2016 and February 2017. Three OBGYN residents and five OBGYN supervising surgeons were involved in six laparoscopic cases. Intraoperative and video playback dialogues were recorded and analysed, the former deductively using codes identified from published literature, and the latter both deductively, using the same codes, and inductively, with codes that emerged from the data during analysis.
Results: 1090 intraoperative interactions were identified within 376 minutes of dialogue. Most interactions were didactic, instructing the resident how to use an instrument to perform a task. Deductive analysis of postoperative video playback review identified 146 interactions within 155 minutes. While the most common interaction type remained didactic, a teaching component was included more often. It became apparent that deductive analysis using the intraoperative codes did not adequately capture the nature and focus of feedback during video playback. Hermeneutic phenomenological analysis identified more dialogic video playback sessions with more resident-initiated questions and reflection.
Conclusions: This study demonstrates that the nature of feedback during video playback is fundamentally different from that in the OR, offering a greater potential for collaborative and improved learning.Contexte : La rĂ©troaction sur la performance peropĂ©ratoire demeure la pierre angulaire de la formation chirurgicale. Le visionnement de vidĂ©os est un moyen dâoffrir une rĂ©troaction plus efficace aux rĂ©sidents en chirurgie. Des recherches supplĂ©mentaires sont nĂ©cessaires pour mieux cerner cette mĂ©thode. La prĂ©sente Ă©tude explore la nature des interactions pĂ©dagogiques et de la rĂ©troaction donnĂ©e en salle dâopĂ©ration et lors du visionnement de vidĂ©os au cours de lâanalyse postopĂ©ratoire dans le cadre de la formation en obstĂ©trique et gynĂ©cologie.
MĂ©thode : Cette Ă©tude de cas a Ă©tĂ© rĂ©alisĂ©e entre septembre 2016 et fĂ©vrier 2017. Trois rĂ©sidents et cinq chirurgiens superviseurs en obstĂ©trique et gynĂ©cologie ont participĂ© Ă six interventions laparoscopiques. Les dialogues peropĂ©ratoires et les Ă©changes qui ont eu lieu lors du visionnement des vidĂ©os ont Ă©tĂ© enregistrĂ©s et analysĂ©s, les premiers de maniĂšre dĂ©ductive en utilisant les codes tirĂ©s de la littĂ©rature, et les seconds Ă la fois de maniĂšre dĂ©ductive, en utilisant les mĂȘmes codes, et inductive, Ă lâaide de codes dĂ©gagĂ©s des donnĂ©es pendant l'analyse.
RĂ©sultats : Les interactions peropĂ©ratoires recensĂ©es au cours des 376 minutes de dialogue sont au nombre de 1090. La plupart des rĂ©troactions Ă©taient didactiques, visant Ă expliquer au rĂ©sident comment utiliser un instrument pour effectuer une tĂąche. L'analyse dĂ©ductive des vidĂ©os postopĂ©ratoires a permis le repĂ©rage de 146 interactions au cours dâune pĂ©riode de 155 minutes. Si la plupart de ces interactions demeuraient didactiques, elles comprenaient plus souvent une composante dâenseignement. Il sâest avĂ©rĂ© que l'analyse dĂ©ductive Ă lâaide des codes peropĂ©ratoires ne rendait pas compte de maniĂšre adĂ©quate de la nature et de l'objectif de la rĂ©troaction offerte pendant le visionnement des vidĂ©os. L'analyse phĂ©nomĂ©nologique hermĂ©neutique a permis d'identifier des sĂ©ances de visionnement qui Ă©taient plus dialogiques, comprenant davantage de questions et de rĂ©flexions provenant des rĂ©sidents.
Conclusion : La prĂ©sente Ă©tude montre que la rĂ©troaction donnĂ©e pendant le visionnement des vidĂ©os et celle donnĂ©e en salle d'opĂ©ration sont fondamentalement diffĂ©rentes, et que la premiĂšre favorise davantage que la seconde lâapprentissage collaboratif et son efficacitĂ©
Surprising variations in the rotation of the chemically peculiar stars CU Virginis and V901 Orionis
CU Vir and V901 Ori belong among these few magnetic chemically peculiar stars
whose rotation periods vary on timescales of decades. We aim to study the
stability of the periods in CU Vir and V901 Ori using all accessible
observational data containing phase information. We collected all available
relevant archived observations supplemented with our new measurements of these
stars and analysed the period variations of the stars using a novel method that
allows for the combination of data of diverse sorts. We found that the shapes
of their phase curves were constant, while the periods were changing. Both
stars exhibit alternating intervals of rotational braking and acceleration. The
rotation period of CU Vir was gradually shortening until the year 1968, when it
reached its local minimum of 0.52067198 d. The period then started increasing,
reaching its local maximum of 0.5207163 d in the year 2005. Since that time the
rotation has begun to accelerate again. We also found much smaller period
changes in CU Vir on a timescale of several years. The rotation period of V901
Ori was increasing for the past quarter-century, reaching a maximum of 1.538771
d in the year 2003, when the rotation period began to decrease. A theoretically
unexpected alternating variability of rotation periods in these stars would
remove the spin-down time paradox and brings a new insight into structure and
evolution of magnetic upper-main-sequence stars.Comment: 5 pages, 3 figure
The radio lighthouse CU Virginis: the spindown of a single main sequence star
The fast rotating star CU Virginis is a magnetic chemically peculiar star
with an oblique dipolar magnetic field. The continuum radio emission has been
interpreted as gyrosyncrotron emission arising from a thin magnetospheric
layer. Previous radio observations at 1.4 GHz showed that a 100% circular
polarized and highly directive emission component overlaps to the continuum
emission two times per rotation, when the magnetic axis lies in the plane of
the sky. This sort of radio lighthouse has been proposed to be due to cyclotron
maser emission generated above the magnetic pole and propagating
perpendicularly to the magnetic axis. Observations carried out with the
Australia Telescope Compact Array at 1.4 and 2.5 GHz one year after this
discovery show that this radio emission is still present, meaning that the
phenomenon responsible for this process is steady on a timescale of years. The
emitted radiation spans at least 1 GHz, being observed from 1.4 to 2.5 GHz. On
the light of recent results on the physics of the magnetosphere of this star,
the possibility of plasma radiation is ruled out. The characteristics of this
radio lighthouse provides us a good marker of the rotation period, since the
peaks are visible at particular rotational phases. After one year, they show a
delay of about 15 minutes. This is interpreted as a new abrupt spinning down of
the star. Among several possibilities, a quick emptying of the equatorial
magnetic belt after reaching the maximum density can account for the magnitude
of the breaking. The study of the coherent emission in stars like CU Vir, as
well as in pre main sequence stars, can give important insight into the angular
momentum evolution in young stars. This is a promising field of investigation
that high sensitivity radio interferometers such as SKA can exploit.Comment: Accepted to MNRAS, 8 pages, 7 figures, updated versio
A Tight Upper Limit on Oscillations in the Ap star Epsilon Ursae Majoris from WIRE Photometry
Observations of Epsilon UMa obtained with the star tracker on the Wide Field
Infrared Explorer (WIRE) satellite during a month in mid-2000 are analyzed.
This is one of the most precise photometry of an Ap star. The amplitude
spectrum is used to set an upper limit of 75 parts per million for the
amplitude of stellar pulsations in this star unless it accidentally oscillates
with a single mode at the satellite orbit, its harmonics or their one day
aliases. This is the tightest limit put on the amplitude of oscillations in an
Ap star. As the rotation period of Epsilon UMa is relatively short (5.1 d), it
cannot be argued that the observations were made at a wrong rotational phase.
Our results thus support the idea that some Ap stars do not pulsate at all.Comment: 4 pages, 4 figures, 2 style files, accepted for publication in ApJ
Hospital usage of TOXBASE in Great Britain:Temporal trends in accesses 2008 to 2015
Aim: Examining temporal trends in accesses to the UK's National Poison Information Service's TOXBASE database in Britain. Methods: Generalised additive models were used to examine trends in daily numbers of accesses to TOXBASE from British emergency departments between January 2008 and December 2015. Day-of-the-week, seasonality and long term trends were analysed at national and regional levels (Wales, Scotland and the 9 English Government Office Regions). Results: The long-term trend in daily accesses increases from 2.8 (95% CI:2.6, 3.0) per user on 1st January 2008 to 4.6 (95% CI:4.3, 4.9) on 31st December 2015, with small but significant differences in population-corrected accesses by region (p<0.001). There are statistically significant seasonal and day of the week patterns (p<0.001) across all regions. Accesses are 18 % (95% CI:14%, 22%) higher in summer than in January and at the weekend compared to weekdays in all regions; there is a 7.5% (95% CI:6.1%, 8.9%) increase between Friday and Sunday. Conclusions: There are consistent in-year patterns in access to TOXBASE indicating potential seasonal patterns in poisonings in Britain, with location-dependant rates of usage. This novel descriptive work lays the basis for future work on the interaction of TOXBASE use with emergency admission of patients into hospital
Emergence of Bulk CsCl Structure in (CsCl)nCs+ Cluster Ions
The emergence of CsCl bulk structure in (CsCl)nCs+ cluster ions is
investigated using a mixed quantum-mechanical/semiempirical theoretical
approach. We find that rhombic dodecahedral fragments (with bulk CsCl symmetry)
are more stable than rock-salt fragments after the completion of the fifth
rhombic dodecahedral atomic shell. From this size (n=184) on, a new set of
magic numbers should appear in the experimental mass spectra. We also propose
another experimental test for this transition, which explicitely involves the
electronic structure of the cluster. Finally, we perform more detailed
calculations in the size range n=31--33, where recent experimental
investigations have found indications of the presence of rhombic dodecahedral
(CsCl)32Cs+ isomers in the cluster beams.Comment: LaTeX file. 6 pages and 4 pictures. Accepted for publication in Phys.
Rev.
- âŠ