Forecasting severe ice storms using numerical weather prediction: the March 2010 Newfoundland event

The northeast coast of North America is frequently hit by severe ice storms. These freezing rain events can produce large ice accretions that damage structures, frequently power transmission and distribution infrastructure. For this reason, it is highly desirable to model and forecast such icing events, so that the consequent damages can be prevented or mitigated. The case study presented in this paper focuses on the March 2010 ice storm event that took place in eastern Newfoundland. We apply a combination of a numerical weather prediction model and an ice accretion algorithm to simulate a forecast of this event. <br><br> The main goals of this study are to compare the simulated meteorological variables to observations, and to assess the ability of the model to accurately predict the ice accretion load for different forecast horizons. The duration and timing of the freezing rain event that occurred between the night of 4 March and the morning of 6 March was simulated well in all model runs. The total precipitation amounts in the model, however, differed by up to a factor of two from the observations. The accuracy of the model air temperature strongly depended on the forecast horizon, but it was acceptable for all simulation runs. The simulated accretion loads were also compared to the design values for power delivery structures in the region. The results indicated that the simulated values exceeded design criteria in the areas of reported damage and power outages

Lingering Legacy: The Impact Fan Reactions had on Media Framing in the Rossi-Marquez Rivalry

This study examines the influence that fan commentary has on media framing in sports journalism, especially in times of intense rivalry. The rivalry chosen for this specific study was Marc Marquez-Valentino Rossi as seen in the MotoGP championship. This research discusses the cyclical nature between the interaction of fan and media while shaping popular narratives in sport. A qualitative analysis of media headlines and fan comments was conducted comparing those found at the start of the rivalry in 2015, with reporting at its height, to that of the legacy reporting seen in the years that followed. Findings in this study show the media adopting the negative focused, emotionally charged narratives introduced by fans. This shows the struggle for professionalism and subjectivity within sports journalism, highlighting how the rise of a digital age has shaped the landscape of sports journalism

Measurement of Analyzing Power for Proton-Carbon Elastic Scattering in the Coulomb-Nuclear Interference Region with a 22-GeV/c Polarized Proton Beam

The analyzing power for proton-carbon elastic scattering in the coulomb-nuclear interference region of momentum transfer, $9.0\times10^{-3}<-t<4.1\times10^{-2}$ (GeV/$c)^{2}$, was measured with a 21.7 GeV/$c$ polarized proton beam at the Alternating Gradient Synchrotron of Brookhaven National Laboratory. The ratio of hadronic spin-flip to non-flip amplitude, $r_5$, was obtained from the analyzing power to be $\text{Re} r_5=0.088\pm 0.058$ and $\text{Im} r_5=-0.161\pm 0.226$.Comment: 4 pages, 4 figures and 1 table. Accepted by Physical Review Letter

Precision Measurement of PArity Violation in Polarized Cold Neutron Capture on the Proton: the NPDGamma Experiment

The NPDGamma experiment at the Los Alamos Neutron Science Center (LANSCE) is dedicated to measure with high precision the parity violating asymmetry in the $\gamma$ emission after capture of spin polarized cold neutrons in para-hydrogen. The measurement will determine unambiguously the weak pion-nucleon-nucleon ($\pi NN$) coupling constant {\it f$^1_{\pi}$}Comment: Proceedings of the PANIC'05 Conference, Santa Fe, NM, USA, October 24-28, 2005, 3 pages, 2 figure

User-centred design of flexible hypermedia for a mobile guide: Reflections on the hyperaudio experience

A user-centred design approach involves end-users from the very beginning. Considering users at the early stages compels designers to think in terms of utility and usability and helps develop the system on what is actually needed. This paper discusses the case of HyperAudio, a context-sensitive adaptive and mobile guide to museums developed in the late 90s. User requirements were collected via a survey to understand visitors’ profiles and visit styles in Natural Science museums. The knowledge acquired supported the specification of system requirements, helping defining user model, data structure and adaptive behaviour of the system. User requirements guided the design decisions on what could be implemented by using simple adaptable triggers and what instead needed more sophisticated adaptive techniques, a fundamental choice when all the computation must be done on a PDA. Graphical and interactive environments for developing and testing complex adaptive systems are discussed as a further step towards an iterative design that considers the user interaction a central point. The paper discusses how such an environment allows designers and developers to experiment with different system’s behaviours and to widely test it under realistic conditions by simulation of the actual context evolving over time. The understanding gained in HyperAudio is then considered in the perspective of the developments that followed that first experience: our findings seem still valid despite the passed time

AN ACCURACY-INTEGRATED METRIC FOR EVALUATING THROWING PERFORMANCE

The purpose of this study was to present a proof-of-concept for a novel Accuracy-Integrated Metric (AIM) to evaluate throwing performance. Ball velocity, displacement from target, and throw distance data were simulated for ten throws, and an AIM score calculated for each. Throws were ranked per conventional evaluation methods (by ball velocity), and by AIM score. When ranked on ball velocity, throw 7 ranked highest (36.0 m.s-1); however, it scored lowest with AIM (10.2) owing to a large displacement value. Discrepancies in these rankings highlight the limitations of relying solely on one aspect of performance when evaluating throwing. By considering ball velocity and accuracy together, AIM provides a more objective way to assess throwing performance which it is hoped will facilitate greater in-depth analyses of throwing biomechanics, and the aspects related to performance

KINEMATIC ATTRIBUTES ASSOCIATED WITH OVERARM THROWING PERFORMANCE IN CRICKET

The purpose of this study was to identify the kinematic attributes associated with throwing performance (ball velocity and accuracy) in cricket. Three-dimensional motion analysis of sixteen cricketers performing 30 ground-fielding attempts towards a target from three approach directions (straight, non-dominant and dominant) was captured. Vertical release angle, stride length, trunk flexion velocity & forward trunk tilt angle at release were significant predictors of ball velocity across the three approach conditions. Horizontal release angle was a significant predictor of throw accuracy in all three approaches. ANOVAs revealed that throws were significantly quicker from the straight approach, and significantly more accurate in the dominant and straight conditions. Throwing performance and mechanical attributes of throwing technique differ by approach direction constraint

Close-to-threshold Meson Production in Hadronic Interactions

Studies of meson production at threshold in the hadron--hadron interaction began in the fifties when sufficient energies of accelerated protons were available. A strong interdependence between developments in accelerator physics, detector performance and theoretical understanding led to a unique vivid field of physics. Early experiments performed with bubble chambers revealed already typical ingredients of threshold studies, which were superseded by more complete meson production investigations at the nucleon beam facilities TRIUMF, LAMPF, PSI, LEAR and SATURNE. Currently, with the advent of the new cooler rings as IUCF, CELSIUS and COSY the field is entering a new domain of precision and the next step of further progress. The analysis of this new data in the short range limit permits a more fundamental consideration and a quantitative comparison of the production processes for different mesons in the few--body final states. The interpretation of the data take advantage of the fact that production reactions close-to-threshold are characterized by only a few degrees of freedom between a well defined combination of initial and exit channels. Deviations from predictions of phase-space controlled one-meson-exchange models are indications of new and exciting physics. Precision data on differential cross sections, isospin and spin observables -- partly but by no means adequately available -- are presently turning up on the horizon. There is work for the next years and excitement of the physics expected. Here we try to give a brief and at the same time comprehensive overview of this field of hadronic threshold production studies.Comment: 100 pages, Review article to be published in Prog. Part. Nucl. Phys. Vol. 49, issue 1 (2002

Experimental Facilities Development

This research was sponsored by the National Science Foundation Grant NSF PHY 87-1440