Dingo destruction 3 —The annual habits of dingoes in northern pastoral areas

While the basic principles of poisoning and trapping are the same throughout the State, there are differences in technique in various localities which are largely based on the annual habits of dogs in those areas. It is hoped that the information contained in this article will assist pas t oral is ts and others who are interested in the control of wild dogs throughout the northern pastoral areas

North of the Nullarbor Plain

For a few hardy dingo-trappers—experienced bushmen able and willing to endure the rigours pf a nomadic existence in a waterless country - the area to the north of the Nullabor Plains has long been a favoured watering ground. In the 1949-1950 season bounties were paid on about 3,000 dingo scalps from this area

Wild dog investigations

Following the information gained during the expedition to the north of the Nullabor plains in 1951, which indicated that dogs were moving along well defined leads on to the Plains from the direction of the Warburton Ranges, the Agriculture Protection Board authorised a further expedition by the Vermin Control Branch to endeavor to trace the origin of the migrations. Large sandhills had prevented the Nullabor Plains expedition from following the leads as far north as planned

Dingo destruction—destroying wild dog pups

Quite apart from the heavy financial losses caused in the sheep industry by the depredations of wild dogs (we use the term to cover both the true dingoes and various breeds of domesticated dogs running wild), the ghastly suffering which they cause should make every sheep-owner anxious to destroy these canine scourges wherever an opportunity offers. Wild dogs on killing sprees will maim and kill far more sheep than they can eat, but they cause the greatest suffering when teaching pups to kill. At such times, the adult dogs will disable sheep and leave them till the pups are brought up to inflict further suffering on the helpless victims. This process will be repeated again and again until the pups are able to make their own kills

Choosing the lesser of two evils, the better of two goods: Specifying the roles of ventromedial prefrontal cortex and dorsal anterior cingulate in object choice

The ventromedial prefrontal cortex (vmPFC) and dorsal anterior cingulate cortices (ACd) are considered important for reward-based decision making. However, work distinguishing their individual functional contributions has only begun. One aspect of decision making that has received little attention is that making the right choice often translates to making the better choice. Thus, response choice often occurs in situations where both options are desirable (e.g., choosing between mousse au chocolat or crème caramel cheesecake from a menu) or, alternatively, in situations where both options are undesirable. Moreover, response choice is easier when the reinforcements associated with the objects are far apart, rather than close together, in value. We used functional magnetic resonance imaging to delineate the functional roles of the vmPFC and ACd by investigating these two aspects of decision making: (1) decision form (i.e., choosing between two objects to gain the greater reward or the lesser punishment), and (2) between-object reinforcement distance (i.e., the difference in reinforcements associated with the two objects). Blood oxygen level-dependent (BOLD) responses within the ACd and vmPFC were both related to decision form but differentially. Whereas ACd showed greater responses when deciding between objects to gain the lesser punishment, vmPFC showed greater responses when deciding between objects to gain the greater reward. Moreover, vmPFC was sensitive to reinforcement expectations associated with both the chosen and the forgone choice. In contrast, BOLD responses within ACd, but not vmPFC, related to between-object reinforcement distance, increasing as the distance between the reinforcements of the two objects decreased. These data are interpreted with reference to models of ACd and vmPFC functioning

A Detailed Analysis of a Cygnus Loop Shock-Cloud Interaction

The XA region of the Cygnus Loop is a complex zone of radiative and nonradiative shocks interacting with interstellar clouds. We combine five far ultraviolet spectral observations from the Hopkins Ultraviolet Telescope (HUT), a grid of 24 IUE spectra and a high-resolution longslit Halpha spectrum to study the spatial emission line variations across the region. These spectral data are placed in context using ground-based, optical emission line images of the region and a far-UV image obtained by the Ultraviolet Imaging Telescope (UIT). The presence of high-ionization ions (OVI, NV, CIV) indicates a shock velocity near 170 km/s while other diagnostics indicate v_shock=140 km/s. It is likely that a large range of shock velocities may exist at a spatial scale smaller than we are able to resolve. By comparing CIV 1550, CIII 977 and CIII] 1909, we explore resonance scattering across the region. We find that a significant column depth is present at all positions, including those not near bright optical/UV filaments. Analysis of the OVI doublet ratio suggests an average optical depth of about unity in that ion while flux measurements of [SiVIII] 1443 suggest a hot component in the region at just below 10^6K. Given the brightness of the OVI emission and the age of the interaction, we rule out the mixing layer interpretation of the UV emission. Furthermore, we formulate a picture of the XA region as the encounter of the blast wave with a finger of dense gas protruding inward from the pre-SN cavity.Comment: 21 pages, 9 figures, accepted by the Astronomical Journal, July 2001 Full resolution figures available at http://fuse.pha.jhu.edu/~danforth/xa

The use of real time digital simulation and hardware in the loop to de-risk novel control algorithms

Low power demonstrators are commonly used to validate novel control algorithms. However, the response of the demonstrator to network transients and faults is often unexplored. The importance of this work has, in the past, justified facilities such as the T45 Shore Integration Test Facility (SITF) at the Electric Ship Technology Demonstrator (ESTD). This paper presents the use of real time digital simulation and hardware in the loop to de-risk a innovative control algorithm with respect to network transients and faults. A novel feature of the study is the modelling of events at the power electronics level (time steps of circa 2 μs) and the system level (time steps of circa 50 μs)