The AEPEX Mission: Imaging Energetic Particle Precipitation Into Earth’s Upper Atmosphere

Radiation belt electron fluxes can be enhanced during geomagnetic storms by two orders of magnitude; subsequently, these fluxes decay back to nominal levels in a few days. Precipitation into the upper atmosphere is a primary loss mechanism for these electrons, particularly during the decay phase. Upon impacting the upper atmosphere, these electrons create new ionization, leading to a chemical response that increases NOx and HOx and destroys ozone. Quantifying both radiation belt loss and the impact on the atmosphere requires an accurate estimate of the flux, energy spectrum, and spatial and temporal scales of precipitation. The NASA-funded Atmospheric Effects of Precipitation through Energetic X-rays (AEPEX) Cube-Sat mission is designed to quantify these parameters of radiation belt precipitation by measuring the bremsstrahlung X-rays created during the precipitation process, using a new instrument called the Atmospheric X-ray Imaging Spectrometer (AXIS). Hard X-rays (50-300 keV) emitted by Earth’s atmosphere have previously been measured from high-altitude balloons and satellites, but have never been imaged from space. The AXIS instrument will image the X-ray fluxes produced by the atmosphere, providing measurements of spatial scales, along with the X-ray flux and spectrum, using off-the-shelf pixelated detector modules and coded aperture optics. A solid-state energetic particle detector, with heritage from the FIREBIRD Cube Sat mission, will measure the precipitating electron energy spectrum, which is used to constrain the inversion from X-ray fluxes to electron fluxes. The AEPEX spacecraft is a 6U CubeSat, currently being built by the University of Colorado Boulder. It includes a custom-designed structure and a custom spacecraft bus consisting of an electrical power system, command and data handling, flight software, and instrument interface electronics designed by the Laboratory for Atmospheric and Space Physics (LASP) at CU Boulder. The system also includes custom-designed doubly-deployable solar panels. The mission will be launched into ahigh-inclination orbit to ensure coverage of high latitudes; launch is scheduled for early 2024

The 'island rule' in birds: medium body size and its ecological explanation.

Do birds show a different pattern of insular evolution from mammals? Mammals follow the 'island rule', with large-bodied species getting smaller on islands and small-bodied species getting bigger. By contrast, the traditional view on birds is that they follow no general island rule for body size, but that there is an insular trend for large bills. Insular shifts in feeding ecology are, therefore, widely assumed to be the primary cause of divergence in island birds. We use a comparative approach to test these ideas. Contrary to the traditional view, we find no evidence for increased bill size in insular populations. Instead, changes in both bill size and body size obey the 'island rule'. The differences between our results and the traditional view arise because previous analyses were based largely on passerines. We also investigate some ecological factors that are thought to influence island evolution. As predicted by the traditional view, shifts in bill size are associated with feeding ecology. By contrast, shifts in body size are associated with the potential for intraspecific competition and thermal ecology. All these results remain qualitatively unchanged when we use different methods to score the ecological factors and restrict our analyses to taxa showing pronounced morphological divergence. Because of strong covariation between ecological factors, however, we cannot estimate the relative importance of each ecological factor. Overall, our results show that the island rule is valid for both body size and bill length in birds and that, in addition to feeding ecology, insular shifts in the level of intraspecific competition and the abiotic environment also have a role

Performance of british university psychology departments as measured by number of publications in BPS journals.

The aim of this investigation was to gauge the comparative research performance of university departments of psychology in Britain. The performance indicator was the number of publications per departmental staff member in the journals of the British Psychological Society (BPS) during the seven-year period 1983–1989. The contents of these journals were thoroughly searched, and articles written by members of university psychology departments in Britain were counted. The number of publications of each psychology department was divided by the size of the department in the corresponding year and the resulting annual figures were summed to determine the number of publications in BPS journals per departmental staff member over the seven-year period. These research performance figures correlated significantly with an earlier measure of departmental research performance based on publications in the seven European psychological journals with the highest citations per published article and with recent performance indicators based on other criteria

The influence of gene flow and drift on genetic and phenotypic divergence in two species of Zosterops in Vanuatu

Colonization of an archipelago sets the stage for adaptive radiation. However, some archipelagos are home to spectacular radiations, while others have much lower levels of diversification. The amount of gene flow among allopatric populations is one factor proposed to contribute to this variation. In island colonizing birds, selection for reduced dispersal ability is predicted to produce changing patterns of regional population genetic structure as gene flow-dominated systems give way to drift-mediated divergence. If this transition is important in facilitating phenotypic divergence, levels of genetic and phenotypic divergence should be associated. We consider population genetic structure and phenotypic divergence among two co-distributed, congeneric (Genus: Zosterops) bird species inhabiting the Vanuatu archipelago. The more recent colonist, Z. lateralis, exhibits genetic patterns consistent with a strong influence of distance-mediated gene flow. However, complex patterns of asymmetrical gene flow indicate variation in dispersal ability or inclination among populations. The endemic species, Z. flavifrons, shows only a partial transition towards a drift-mediated system, despite a long evolutionary history on the archipelago. We find no strong evidence that gene flow constrains phenotypic divergence in either species, suggesting that levels of inter-island gene flow do not explain the absence of a radiation across this archipelago

A specialist peer mentoring program for university students on the autism spectrum: A pilot study

The provision of peer mentoring may improve tertiary education outcomes of students with autism spectrum disorder (ASD). This study evaluated the pilot year of the Curtin Specialist Mentoring Program (CSMP), a specialised peer mentoring program for university students with ASD aimed at improving self-reported well-being, academic success and retention in university studies.A single group pre-test, post-test design was employed. Quantitative and qualitative evaluations were undertaken with 10 young adults with ASD to explore the effectiveness and acceptability of the CSMP program. Students completed a battery of questionnaires focused on general anxiety, state communication apprehension, perceived communication competence, and communication apprehension both prior to, and five months after commencing enrolment in the CSMP. Information regarding academic success and retention was also obtained. Interviews with participants provided further insight into their experience of the program.Students enrolled in the CSMP showed significant improvement in social support and general communication apprehension assessment scores. Interviews revealed key features of the CSMP that may have contributed to these positive outcomes.The current study provides preliminary evidence that a specialised peer mentoring program can improve the well-being of students with ASD, and highlights the importance of interventions which are individualised, flexible, based on a social model, and target environmental factors such as social support

To teach or to compete? A strategic dilemma of knowledge owners in international alliances

Knowledge-asymmetry, Location-asymmetry, International alliance, Governance-mode, Emerging economies,

Author's personal copy Viewpoint Ocean urea fertilization for carbon credits poses high ecological risks

a b s t r a c t The proposed plan for enrichment of the Sulu Sea, Philippines, a region of rich marine biodiversity, with thousands of tonnes of urea in order to stimulate algal blooms and sequester carbon is flawed for multiple reasons. Urea is preferentially used as a nitrogen source by some cyanobacteria and dinoflagellates, many of which are neutrally or positively buoyant. Biological pumps to the deep sea are classically leaky, and the inefficient burial of new biomass makes the estimation of a net loss of carbon from the atmosphere questionable at best. The potential for growth of toxic dinoflagellates is also high, as many grow well on urea and some even increase their toxicity when grown on urea. Many toxic dinoflagellates form cysts which can settle to the sediment and germinate in subsequent years, forming new blooms even without further fertilization. If large-scale blooms do occur, it is likely that they will contribute to hypoxia in the bottom waters upon decomposition. Lastly, urea production requires fossil fuel usage, further limiting the potential for net carbon sequestration. The environmental and economic impacts are potentially great and need to be rigorously assessed