The Galactic Millisecond Pulsar Population

Among the current sample of over 2000 radio pulsars known primarily in the disk of our Galaxy, millisecond pulsars now number almost 200. Due to the phenomenal success of blind surveys of the Galactic field, and targeted searches of Fermi gamma-ray sources, for the first time in over a decade, Galactic millisecond pulsars now outnumber their counterparts in globular clusters! In this paper, I briefly review earlier results from studies of the Galactic millisecond pulsar population and present new constraints based on a sample of 60 millisecond pulsars discovered by 20 cm Parkes multibeam surveys. I present a simple model of the population containing $\sim 30,000$ potentially observable millisecond pulsars with a luminosity function, radial distribution and scale height that matches the observed sample of objects. This study represents only a first step towards a more complete understanding of the parent population of millisecond pulsars in the Galaxy and I conclude with some suggestions for further study in this area.Comment: Proceedings of IAUS 291 "Neutron Stars and Pulsars: Challenges and Opportunities after 80 years", J. van Leeuwen (ed.); 6 pages, 1 figur

Reflect – renew – refresh

No abstract available

Are coach education programmes the most effective method for coach development?

The purpose of this study is to establish whether coaches from a multi-sport context develop most effectively through coach education programmes and whether formal learning is fostering coach effectiveness. A sample of eight qualified male multi-sports’ coaches participated with an age range of 24 to 52 years (M = 32.6, ± = 8.9) and 9 to 18 years coaching experience (M = 12.6, ± = 3.8). Qualitative semi structured interviews were employed, lasting approximately 30 to 60 minutes. The data then underwent a thematic analysis process reducing the data into six overarching themes: values of the coach; the coach’s role on athlete development; forms of learning; barriers regarding coach education; role of governing bodies; coaches career pathway. The findings of the study indicated coaches access a wide range of sources to enhance their practice, but informal learning was preferred (interacting with other coaches and learning by doing). This resulted from numerous barriers experienced surrounding the delivery, cost and access to coach education programmes preventing coaches from progressing through the pathway. However, coaches in the study feel coach education should be a mandatory process for every coach. The findings have implications for policymakers and sport organisations in developing their coach education structure

Feedback of information in the empathic accuracy of sport coaches

Objective The purpose of this study was to investigate changes in the empathic accuracy of sport coaches in relation to feedback of information. Coaches' experience and qualification level were also considered. Method Sixty badminton coaches were randomly assigned to either an experimental or a control group. All coaches watched a video of an athlete's technical training session with her coach. At designated segments of the video all coaches were asked to make inferences about what the athlete's thoughts and feelings had been. Only the coaches in the experimental group were given corrective feedback on the athlete's thoughts and feelings following their inference. Empathic accuracy was estimated by comparing these inferences with the athlete's own self-reported thoughts and feelings. Results It was shown that both groups' empathic accuracy improved over the course of watching the video; however, the experimental group improved significantly more. It was found that coaches' experience was significantly associated with empathic accuracy for the control group only. Conclusions The results suggest that continued exposure to an athlete increases a coach's empathic accuracy and that this can be significantly improved with accurate feedback about that athlete

The influence of role and gender in the empathic accuracy of coaches and athletes

Objective: The purpose of this study was to investigate differences in the empathic accuracy of coaches and athletes in relation to the gender of the dyad member occupying each role in the coach-athlete relationship. Method: The empathic accuracy of fifty-six coach-athlete dyads was assessed using actual recordings of their own training sessions (see Lorimer & Jowett, 2009a; 2009b). Participants viewed selected video footage of discrete interactions that had occurred during these training sessions. Participants reported what they remembered thinking and feeling while making inferences about what their partner’s had thought and felt at those points. Comparison of partners self-reports and inferences allowed their empathic accuracy to be calculated. Results: It was found that female coaches were more accurate than male coaches. Additionally, for athletes, the highest accuracy scores were displayed by female athletes working with male coaches, and the least by female athletes working with female coaches. Conclusions: The results are discussed in terms of Social Role Theory and suggest that the interaction between the expectations of coach and athlete roles and gender play a key part in how accurately coaches and athletes perceive each other

Spruce Budworm Weight and Fecundity: Means, Frequency Distributions, and Correlations for Two Populations (Lepidoptera: Tortricidae)

Pupal weights and fecundities of spruce budworm from Minnesota had different means, coefficients of variation, and frequency distributions than spruce budworm from New Hampshire. The two variables were correlated in one of the populations but not the other

The Galactic centre pulsar population

The recent discovery of a magnetar in the Galactic centre region has allowed Spitler et al. to characterize the interstellar scattering in that direction. They find that the temporal broadening of the pulse profile of the magnetar is substantially less than that predicted by models of the electron density of that region. This raises the question of what the plausible limits for the number of potentially observable pulsars - i.e., the number of pulsars beaming towards the Earth - in the Galactic centre are. In this paper, using reasonable assumptions - namely, (i) the luminosity function of pulsars in the Galactic centre region is the same as that in the field, (ii) the region has had a constant pulsar formation rate, (iii) the spin and luminosity evolution of magnetars and pulsars are similar, and (iv) the scattering in the direction of the Galactic centre magnetar is representative of the entire inner parsec - we show that the potentially observable population of pulsars in the inner parsec has a conservative upper limit of $\sim$ 200, and that it is premature to conclude that the number of pulsars in this region is small. We also show that the observational results so far are consistent with this number and make predictions for future radio pulsar surveys of the Galactic centre.Comment: 5 pages, 3 figures, Accepted for publication in MNRAS Letter