Transient absorption of vibrationally excited ice <em>Ih</em>

The ultrafast dynamics of HDO:D2O ice Ih at 180 K is studied by midinfrared ultrafast pump-probe spectroscopy. The vibrational relaxation of HDO:D2O ice is observed to proceed via an intermediate state, which has a blueshifted absorption spectrum. Polarization resolved measurements reveal that the intermediate state is part of the intramolecular relaxation pathway of the HDO molecule. In addition, slow dynamics on a time scale of the order of 10-100 ps is observed, related to thermally induced collective reorganizations of the ice lattice. The transient absorption line shape is analyzed within a Lippincott-Schroeder model for the OH-stretch potential. This analysis identifies the main mechanism behind the strong spectral broadening of the vOH=1-->2 transition

Year-round itinerary of a GPS-tracked Brent Goose Branta b. bernicla that visited the Bassin d'Arcachon, France

The year-round itinerary for a Dark-bellied Brent Goose Branta b. bernicla is described for a bird fitted with a GPS tracking device at Terschelling Island, the Netherlands, in spring 2012. Spring migration commenced when the bird left the Dutch Wadden Sea on 27 May and continued until it reached the Taimyr Peninsula in arctic Russia on 8 June. During the summer months it moved along the coast of the Taimyr Peninsula, prior to moulting on Taimyr Island to the north of the peninsula in July. During autumn migration it frequented eelgrass Zostera sp. beds around Langeness Island in Schleswig- Holstein, Germany and then proceeded to the Bassin d’Arcachon in France, another famous eelgrass area, where it remained from 18 October 2012–12 January 2013 before returning to feed on grassland polders on Terschelling Island in January 2013. The timing of the location data showed that the bird flew large distances in short periods of time during migration. Over the year it covered c. 4,600 km during local movements and c. 15,000 km on migration. The results form part of a larger study investigating the importance of non-breeding habitats (particularly eelgrass vegetation) for the species

Bird radar validation in the field by time-referencing line-transect surveys

Track-while-scan bird radars are widely used in ornithological studies, but often the precise detection capabilities of these systems are unknown. Quantification of radar performance is essential to avoid observational biases, which requires practical methods for validating a radar’s detection capability in specific field settings. In this study a method to quantify the detection capability of a bird radar is presented, as well a demonstration of this method in a case study. By time-referencing line-transect surveys, visually identified birds were automatically linked to individual tracks using their transect crossing time. Detection probabilities were determined as the fraction of the total set of visual observations that could be linked to radar tracks. To avoid ambiguities in assigning radar tracks to visual observations, the observer’s accuracy in determining a bird’s transect crossing time was taken into account. The accuracy was determined by examining the effect of a time lag applied to the visual observations on the number of matches found with radar tracks. Effects of flight altitude, distance, surface substrate and species size on the detection probability by the radar were quantified in a marine intertidal study area. Detection probability varied strongly with all these factors, as well as species-specific flight behaviour. The effective detection range for single birds flying at low altitude for an X-band marine radar based system was estimated at ∼1.5 km. Within this range the fraction of individual flying birds that were detected by the radar was 0.50±0.06 with a detection bias towards higher flight altitudes, larger birds and high tide situations. Besides radar validation, which we consider essential when quantification of bird numbers is important, our method of linking radar tracks to ground-truthed field observations can facilitate species-specific studies using surveillance radars. The methodology may prove equally useful for optimising tracking algorithms

(Ill-Legal) Lust is a battle field: HIV risk, socio-sexuality and criminality

This paper examines the criminalisation of HIV infection. HIV transmission offences exist in all Australian states and territories, but the bulk of prosecutions have occurred in Victoria. This paper outlines criminal legal responses to the virus in that state with an overview of the legislation and case law. Victoria has several HIV specific and nonspecific offences which may be applied to situations of HIV infection risk. It is the HIV non-specific offences which have been successfully used to prosecute HIV infection risks. The case law outlines several instances where HIV positive bodies have been charged with offences for placing others at risk of HIV infection. These charges have been applied in several cases regardless of whether the complainants seroconvert. Those charged have been same-sex desiring men or African-born men who engaged in sex with Caucasian women. There are marked differences in the sentences which have been applied to these defendants, which are based on the sexuality of the defendant and complainant. This demonstrates the heterosexist and Eurocentric character of the performance of these laws. These offences do not operate in isolation to sociality, rather this area of law embodies many cultural panics about the Other. HIV transmission offences signal socio-legal panics about sexuality, race/ethnicity and disease, situating certain bodies at greater risk of crimino-legal punishment.This conference has been generously sponsored by the School of Social and Political Sciences and the Sydney Law School, University of Sydney, in collaboration with the School of Law, University of Western Sydne