Advanced propulsion for LEO and GEO platforms

Mission requirements and mass savings applicable to specific low earth orbit and geostationary earth orbit platforms using three highly developed propulsion systems are described. Advanced hypergolic bipropellant thrusters and hydrazine arcjets can provide about 11 percent additional instrument payload to 14,000 kg LEO platforms. By using electric propulsion on a 8,000 kg class GEO platform, mass savings in excess of 15 percent of the beginning-of-life platform mass are obtained. Effects of large, advanced technology solar arrays and antennas on platform propulsion requirements are also discussed

Deliberating stratospheric aerosols for climate geoengineering and the SPICE project

Increasing concerns about the narrowing window for averting dangerous climate change have prompted calls for research into geoengineering, alongside dialogue with the public regarding this as a possible response. We report results of the first public engagement study to explore the ethics and acceptability of stratospheric aerosol technology and a proposed field trial (the Stratospheric Particle Injection for Climate Engineering (SPICE) ‘pipe and balloon’ test bed) of components for an aerosol deployment mechanism. Although almost all of our participants were willing to allow the field trial to proceed, very few were comfortable with using stratospheric aerosols. This Perspective also discusses how these findings were used in a responsible innovation process for the SPICE project initiated by the UK’s research councils

RESILIENCE ATTRIBUTES AMONG UNIVERSITY STUDENTS: A COMPARATIVE STUDY OF PSYCHOLOGICAL DISTRESS, SLEEP DISTURBANCES AND MINDFULNESS

Australian university students report experiencing higher levels of psychological distress compared to other Australians, and are at increased risk of developing mental health problems. Psychological distress has been connected with poor academic performance, higher attrition rates and sleep disturbances. A protective factor associated with sleep-related selfregulation is mindfulness. Mindfulness based programs have shown benefits in stress reduction and resilience. Resilience is considered a protective factor that interacts with stressors to reduce the likelihood of negative outcomes. Resilience is also associated with positive social and personal well-being together with enhanced mental health and adjustment to university life. The current study examines the attributes of resilient university students, by comparing the differences between high and low resilient students on levels of reported psychological distress, sleep disturbances and mindfulness. A total of 89 university students participated in the study aged between 18 to 57 years. Results showed that university students with high levels of resilience reported significantly lower levels of psychological distress and significantly higher levels of mindfulness, compared to university students reporting low levels of resilience. There were no significant differences reported with regard to sleep disturbances. The findings add to extant knowledge of resilience and provide support for universities to develop strategies that promote resilience in university students to reduce the risk of students developing mental health problems, thus enabling students to flourish under academic pressures

Like artificial trees? The effect of framing by natural analogy on public perceptions of geoengineering

The linguistic frames used to describe new areas of science and technology can have a powerful effect on the way that those technologies are perceived by the general public. As geoengineering continues to attract scholarly and policy interest, a number of frames have emerged in the scientific, political and media discourse. In the current paper, we provide an empirical test of one of the most prevalent framing devices: describing geoengineering technologies by analogy to natural processes. In an online experiment with members of the UK public, participants who read a description of geoengineering technologies as analogous to natural processes were more likely to support geoengineering as a response to climate change. In addition, participants’ views about the relationship between geoengineering and nature strongly predicted support for geoengineering. Our findings suggest that communicators should be cautious when using natural analogies to communicate about geoengineering with the general public, as frame choice is likely to influence public attitudes and potentially convey undue positivity

Shale development in the US and Canada : a review of engagement practice

Public and stakeholder engagement with shale development is difficult, but essential. We review 26 engagement processes carried out by US and Canadian companies, alliances, government agencies, academics and activists; systematically exploring who participates, the stage at which engagements take place, aims and methods, provision for multiway engagement, and issues of credibility. We find a multitude of actors carrying out engagement using a variety of formats, ranging from barbeque events and town hall meetings to citizen science and in-depth qualitative research. Whilst we find many strengths, we also highlight a number of weaknesses. Much of this engagement does not occur at the earliest stages of development, and rarely asks the most fundamental question -whether shale development should proceed at all- instead commonly focusing on questions of impact minimisation, regulation and gaining support. Furthermore, the majority of activities tend to elicit the responses of interested and affected parties, with much less attention to views of the wider public. We reflect on what may be limiting engagement practice, and discuss how engagement might be improved

The European Space Agency standard for space packet utilisation

This paper presents the ESA concept for the use of CCSDS defined Telemetry and Telecommand Packets at the application level. These Packets are used to monitor and control remotely a space born application. This concept is defined in a Packet Utilisation Standard (PUS) which should become applicable for all ESA missions using Packets. The production of this standard is under the responsibility of an ESA standardization group called 'COES'

U-Pb Ages of Lunar Apatites

Apatite is one of the minerals that is rarely utilized in U-Pb geochronology, compared to some other U-rich accessory phases. Relatively low U concentration, commonly high proportion of common Pb and low closure temperature of U-Pb system of apatite inhibit its application as geochronological tool when other minerals such as zircon are widely available. However, zircon appear to be restricted to certain type of lunar rocks, carrying so called KREEP signature, whereas apatite (and whitlockite) is a common accessory mineral in the lunar samples. Therefore, utilizing apatite for lunar chronology may increase the pool of rocks that are available for U-Pb dating. The low stability of U-Pb systematics of apatite may also result in the resetting of the system during meteoritic bombardment, in which case apatite may provide an additional tool for the study of the impact history of the Moon. In order to investigate these possibilities, we have analysed apatites and zircons from two breccia samples collected during the Apollo 14 mission. Both samples were collected within the Fra Mauro formation, which is interpreted as a material ejected during the impact that formed the Imbrium Basin

Dynapenic Obesity and the Effect on Long-Term Physical Function and Quality of Life: Data from the Osteoarthritis Initiative

Obesity is associated with functional impairment, institutionalization, and increased mortality risk in elders. Dynapenia is defined as reduced muscle strength and is a known independent predictor of adverse events and disability. The synergy between dynapenia and obesity leads to worse outcomes than either independently. We identified the impact of dynapenic obesity in a cohort at risk for and with knee osteoarthritis on function