The utility of a digital simulation language for ecological modeling

Dynamic modeling of ecological phenomena has been greatly facilitated by the recent development of continuous system simulator programs. This paper illustrates the application of one of these programs, S/360 Continuous System Modeling Program (S/360 CSMP), to four systems of graduated complexity. The first is a two species system, with one feeding on the other, using differential equations with constant coefficients. The second and third systems involve two competing plant species in which the coefficients of the differential equations are varying with time. The final example considers the management of a postulated buffalo herd in which the dynamics of the herd population and composition by sex and age is combined with various strategies to control its size and to optimize buffalo production

Systematic uncertainties in the precise determination of the strangeness magnetic moment of the nucleon

Systematic uncertainties in the recent precise determination of the strangeness magnetic moment of the nucleon are identified and quantified. In summary, G_M^s = -0.046 \pm 0.019 \mu_N.Comment: Invited presentation at PAVI '04, International Workshop on Parity Violation and Hadronic Structure, Laboratoire de Physique Subatomique et de Cosmologie, Grenoble, France, June 8-11, 2004. 7 pages, 16 figure

Intact automatic avoidance of obstacles in patients with visual form agnosia

In everyday life our reaching behaviour has to be guided not only by the location and properties of the target object, but also by the presence of potential obstacles in the workspace. Recent evidence from neglect and optic ataxia patients has suggested that this automatic obstacle avoidance is mediated by the dorsal, rather than the ventral, stream of visual processing. We tested this idea in two studies involving patients with visual form agnosia resulting from bilateral ventral-stream damage. In the first study, we asked patient DF to reach out and pick up a target object in the presence of obstacles placed at varying distances to the left or right of the target. We found that both DF and controls shifted their trajectories away from the potential obstacles and adjusted their grip aperture in such a way as to minimize risk of collision. In a second study, we asked DF and a second patient, SB, to either reach between, or to bisect the space between, two cylinders presented at varying locations. We found that both patients adjusted their reach trajectories to account for shifts in cylinder location in the reaching task, despite showing significantly worse performance than control subjects when asked to make a bisection judgement. Taken together, these data indicate that automatic obstacle avoidance behaviour is spared in our patients with visual form agnosia. We attribute their ability to the functional intactness of the dorsal stream of visual processing, and argue that the ventral stream plays no important role in automatic obstacle avoidance

Novae Ejecta as Colliding Shells

Following on our initial absorption-line analysis of fifteen novae spectra we present additional evidence for the existence of two distinct components of novae ejecta having different origins. As argued in Paper I one component is the rapidly expanding gas ejected from the outer layers of the white dwarf by the outburst. The second component is pre-existing outer, more slowly expanding circumbinary gas that represents ejecta from the secondary star or accretion disk. We present measurements of the emission-line widths that show them to be significantly narrower than the broad P Cygni profiles that immediately precede them. The emission profiles of novae in the nebular phase are distinctly rectangular, i.e., strongly suggestive of emission from a relatively thin, roughly spherical shell. We thus interpret novae spectral evolution in terms of the collision between the two components of ejecta, which converts the early absorption spectrum to an emission-line spectrum within weeks of the outburst. The narrow emission widths require the outer circumbinary gas to be much more massive than the white dwarf ejecta, thereby slowing the latter's expansion upon collision. The presence of a large reservoir of circumbinary gas at the time of outburst is suggestive that novae outbursts may sometime be triggered by collapse of gas onto the white dwarf, as occurs for dwarf novae, rather than steady mass transfer through the inner Lagrangian point.Comment: 12 pages, 3 figures; Revised manuscript; Accepted for publication in Astrophysics & Space Scienc

On ordinal utility, cardinal utility, and random utility

Though the Random Utility Model (RUM) was conceived  entirely in terms of ordinal utility, the apparatus throughwhich it is widely practised exhibits properties of  cardinal utility.  The adoption of cardinal utility as a  working operation of ordinal is perfectly valid, provided  interpretations drawn from that operation remain faithful  to ordinal utility.  The paper considers whether the latterrequirement holds true for several measurements commonly  derived from RUM.  In particular it is found that  measurements of consumer surplus change may depart from  ordinal utility, and exploit the cardinality inherent in  the practical apparatus.

Detection of abandoned mineshafts using towed-array capacitive resistivity and real-time kinematic GPS navigation

The UK has a long history of mining but it was not until 1875 that the accurate mapping of mine workings and the submission of abandonment plans became a legal requirement. Where mineshafts are indicated on plans, they may be mislocated due to poor or inaccurate surveying. Consequently, the redevelopment of derelict land in the built environment frequently encounters potential geohazards, such as old adits, bell pits and shafts. These mining relics pose a serious risk to health and safety. This paper demonstrates how the combination of modem geophysical survey techniques with state-of-the-art satellite-based positioning may assist in the detection of such features. Recent advances in these fields offer the possibility of using towed-array resistivity instruments in conjunction with highly accurate (sub-decimetre) real-time kinematic global positioning systems (RTKGPS). Here we describe the use of multi-offset towed-array capacitive resistivity (CR) with GPS navigation for mapping resistivity over a known mineshaft in the historic mining area of Bonsall Leys in Derbyshire, UK

Field Measurements of Terrestrial and Martian Dust Devils

Surface-based measurements of terrestrial and martian dust devils/convective vortices provided from mobile and stationary platforms are discussed. Imaging of terrestrial dust devils has quantified their rotational and vertical wind speeds, translation speeds, dimensions, dust load, and frequency of occurrence. Imaging of martian dust devils has provided translation speeds and constraints on dimensions, but only limited constraints on vertical motion within a vortex. The longer mission durations on Mars afforded by long operating robotic landers and rovers have provided statistical quantification of vortex occurrence (time-of-sol, and recently seasonal) that has until recently not been a primary outcome of more temporally limited terrestrial dust devil measurement campaigns. Terrestrial measurement campaigns have included a more extensive range of measured vortex parameters (pressure, wind, morphology, etc.) than have martian opportunities, with electric field and direct measure of dust abundance not yet obtained on Mars. No martian robotic mission has yet provided contemporaneous high frequency wind and pressure measurements. Comparison of measured terrestrial and martian dust devil characteristics suggests that martian dust devils are larger and possess faster maximum rotational wind speeds, that the absolute magnitude of the pressure deficit within a terrestrial dust devil is an order of magnitude greater than a martian dust devil, and that the time-of-day variation in vortex frequency is similar. Recent terrestrial investigations have demonstrated the presence of diagnostic dust devil signals within seismic and infrasound measurements; an upcoming Mars robotic mission will obtain similar measurement types

Flamingo Vol. II N 1

Judge. Untitled. Prose. 1. Siren. Untitled. Prose. 1. Purple Cow. Untitled. Prose. 1. Borington, R.D. Deacon Frowzy\u27s Son . Prose. 5. G.W.B. Cynic . Poem. 8. Anonymous. Les Hommes Mysterieux . Poem. 8. K.K.H. October . Poem. 8. G.W.B. Petition . Poem. 8. Society Editor. A Line-A-Day Book For Co-Eds . Prose. 9. Schmitz, Edward. Untitled.Picture. 9. W.D.P. Untitled. Prose.9. Anonymous. SSS . Prose. 9. Anonymous. Untitled. Prose. 9. Anonymous. Untitled. prose. 10. Potter, W.M. Crooning of a Japanese Sandman . Anonymous. Geographical Influence . Prose. 10. George. Vest Pocket News . Prose. 11. Anonymous. Deed\u27s Field-The First Kick-Off . Picture. 12. Anonymous. Denison\u27s Hall of Fame: Kirtley F. Mather . Anonymous. Untitled. Prose. 14. Keeler, Clyde. Once Upon A Time . Cartoon. 16. Anonymous. Untitled. Prose. 18. Anonymous. College Song B.C. 56 . Prose. 18. Anonymous. One Student Classification . Poem. 18. Anonymous. Yea Neptune! . Poem. 18. Anonymous. Untitled. Poem. 19. Punch Bowl. Strongly Prejudiced . Prose. 19. Jester. Follow Copy . Prose. 19. Lord Jeff. Untitled. Prose. 19. Anonymous. Untitled. Prose. 20. Anonymous. Page Mr. Edison . Prose. 20. Speicher. Untitled. Picture. 20. Williams, Grace. Untitled. Picture. 20. Anonymous. Untitled. Prose. 21. Suds. Untitled. Picture. 21. Exchange. Untitled. Prose. 21. Wag Jag. Untitled. Prose. 21. Punch Bowl. Untitled. Prose. 22. Purple Cow. Untitled. Prose. 22. Purple Cow. In The Trenches Prose. 22. Tar Baby. Untitled. Prose. 22. Exchange. Untitled. Prose. 22. Jester. Untitled. Prose. 22. Exchange. Untitled. Prose. 25. Siren. Untitled. Prose. 25. Widow. Untitled. Prose. 25. Anonymous. Untitled. Prose. 25. Voo-Doo. Untitled. Prose. 25. Froth. Untitled. Prose. 25. Judge. It\u27s A Long Turn . Prose. 25. Anonymous. Untitled. Prose. 25. Voo-Doo. Strange . Prose. 28. Sun Dial. Untitled. Prose. 28. Jester. Straight Dope Prose. 28. Banter. Untitled. Prose. 28. Jester. Untitled. Prose. 28. Forth. Additions Prose. 30. Purple Cow. Untitled. Prose. 30. Puppet. A Mouthful . Prose. 30. Showme. Untitled. Prose. 30. Exchange. Untitled. Prose. 30. Scalper. Talking to \u27Em . Prose. 30. Dirge. Untitled. prose. 30. Exchange. Untitled. Prose. 31. Widow. Untitled. Prose. 31. Jester. In The French Class . Prose. 31. Ubersax, Delmar. Untitled. Picture. 3

Responding to the Event Deluge

We present the VOEventNet infrastructure for large-scale rapid follow-up of astronomical events, including selection, annotation, machine intelligence, and coordination of observations. The VOEvent standard is central to this vision, with distributed and replicated services rather than centralized facilities. We also describe some of the event brokers, services, and software that are connected to the network. These technologies will become more important in the coming years, with new event streams from Gaia, LOFAR, LIGO, LSST, and many others.Comment: Submitted to Proceedings of SPIE Observatory Operations, Amsterdam, 2012 July 2-