Origin and evolution of recent Leonid meteor showers

The four most prominent returns of the Leonid shower in the past decade fall into two broad classes. The 1966 and 1969 showers were of short duration, had a high proportion of small particles, and occured with the longest apparent delay after the perihelion passage of the parent comet Temple-Tuttle. By contrast, the 1961 and 1965 returns were of long duration, and had more large particles. The 1961 return preceded the comet. There are three major influences on particle orbits: ejection velocity, radiation pressure, and close encounters with planets. The observations are explainable in a qualitative way on the basis of the first two. But some speculation concerning the results of planetary perturbations are invoked

The Impact of New EUV Diagnostics on CME-Related Kinematics

We present the application of novel diagnostics to the spectroscopic observation of a Coronal Mass Ejection (CME) on disk by the Extreme Ultraviolet Imaging Spectrometer (EIS) on the Hinode spacecraft. We apply a recently developed line profile asymmetry analysis to the spectroscopic observation of NOAA AR 10930 on 14-15 December 2006 to three raster observations before and during the eruption of a 1000km/s CME. We see the impact that the observer's line-of-sight and magnetic field geometry have on the diagnostics used. Further, and more importantly, we identify the on-disk signature of a high-speed outflow behind the CME in the dimming region arising as a result of the eruption. Supported by recent coronal observations of the STEREO spacecraft, we speculate about the momentum flux resulting from this outflow as a secondary momentum source to the CME. The results presented highlight the importance of spectroscopic measurements in relation to CME kinematics, and the need for full-disk synoptic spectroscopic observations of the coronal and chromospheric plasmas to capture the signature of such explosive energy release as a way of providing better constraints of CME propagation times to L1, or any other point of interest in the heliosphere.Comment: Accepted to appear in Solar Physics Topical Issue titled "Remote Sensing of the Inner Heliosphere". Manuscript has 14 pages, 5 color figures. Movies supporting the figures can be found in http://download.hao.ucar.edu/pub/mscott/papers/Weathe

Temperature dependent carrier lifetime studies of Mo in crystalline silicon

The capture cross sections of both electronsσn and holes σp were determined for interstitialmolybdenum in crystalline silicon over the temperature range of −110 to 150 °C. Carrier lifetimemeasurements were performed on molybdenum-contaminated silicon using a temperature controlled photoconductance instrument. Injection dependent lifetime spectroscopy was applied at each temperature to calculate σp and σn. This analysis involved a novel approach that independently determined the capture cross sections at each temperature assuming a known defect density and thermal velocity. Since the energy state is in the lower half of the bandgap, the determination of σp is unaffected by the defect energy at all temperatures, and σp is found to decrease with temperature in a fashion consistent with excitonic Auger capture. At temperatures below 0 °C, the determination of σn is also unaffected by the defect energy due to the suppression of thermal emission, and σn decreases with temperature as well. It is shown that a projection of σn to higher temperature suggests the defect has an energy of 0.375 eV above the valance band edge of silicon.D.M. likes to thank the Australian Research Council for fellowship and G.C. likes to thank “CrystalClear Integrated Project” Contract No. SES6-CT_2003-502583 funded by the European Commission

Examining the Influence of Environmental Opportunities and Exposures on Children\u27s Sleep Duration

This research aims to fill a void in knowledge on how certain characteristics of the built and natural environments may impact children’s sleep duration. Data was collected on a sample of 614 children (aged 9-14 years) drawn from 22 elementary schools throughout the City of London, Ontario, Canada. Participants completed the STEAM (Spatial Temporal Environmental Activity Monitoring) protocol which involved completion of a survey, daily activity diary, and tracking the time they spent in different environments with a portable Global Position System. This thesis incorporates an innovative analytical approach which uses two Geographic Information System techniques to examine if and how different neighbourhood level environmental opportunities and exposures have an influence on children’s sleep duration. Hierarchical multiple linear regressions were used to explore the relationship between children’s sleep duration and neighbourhood level environmental features. Analysis found that green space opportunity positively impacted children’s average sleep duration when measured by Normalized Difference Vegetation Index. Additionally, with each percent increase in amount of time spent around park spaces each day, children’s sleep duration increased by 13 minutes. From these findings, policy makers, educators, and parents can help in promoting a greater amount of time to be spent in parks for healthier sleep durations in children

Entrepreneurship – an undiscovered country

yesThe Body Shop’s business has been an entrepreneurial enterprise of remarkable success. Its core lies on the principle, pioneered by founder Anita Roddick, that ‘(…) the business of business should not be just about money, it should be about responsibility.’ The company is the symbol of the 1970’s corporate social responsibility (CSR) revolution

Partnership is alive and underpinning healthcare delivery

YesBryan McIntosh, senior lecturer in health management and organisational behaviour at the University of Bradford, explores the role of partnerships in the health service

Largest Mesh Deployable Antenna Technology

Preliminary assessments by both government and industry indicate that applications exist in the areas of communications, radio astronomy, and Earth observations requiring large, space based antennas. The mesh deployable antenna, based on its demonstrated success in the smaller aperture range, provides a promising near term capability for satisfying a significant number of these space-based applications. In this article the technology status of mesh deployable antennas is reviewed and design concepts applicable to very large mesh deployable reflectors are discussed. The present state-of-the-art performance is presented along with projections of potential performance improvement. These are compared with identified focus missions from the NASA Large Space Structures Technology (LSST) Program

Hope and glory: an expanded social strategy diagnosis model to incorporate corporate social responsibility within business strategy

YesCorporate social responsibility has been seen by corporations as a practice to adopt as an act of philanthropy. There have been attempts to expand the role of social responsibility to business problems however there has never been an attempt to consider the strategic alignment of social outcomes to strategy. This article analyses the role of strategy by providing a review of strategy using Whittington’s generic strategies model and expanding the same model to incorporate a social strategy model that supports the anecdotal idea that social responsibility can be potentially strategic. The paper centres its argument within the Indian context