729 research outputs found
The gas-phase structure of the hexasilsesquioxane Si<sub>6</sub>O<sub>9</sub>(OSiMe<sub>3</sub>)<sub>6</sub>
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Interdisciplinary pressure cooker: environmental risk communication skills for the next generation
This article presents a Pressure Cooker approach for building interdisciplinary risk communication capacity in young professionals through an intensive 24-hour workshop. The event successfully brought together 35 participants from around the world to work on real-world environmental hazard/risk communication challenges for two areas in Mexico. Participants worked in interdisciplinary teams, following a three-step iterative process, with support from mentors and a range of specialists to develop risk communication outputs. Feedback surveys indicate that the workshop met its goal of improving participants’ knowledge of risk communication and interdisciplinary working. The workshop resulted in an inter-disciplinary community of researchers and practitioners, including organisers, participants and supporting specialists, still active after the event. It is recommended that such interdisciplinary workshops are used to build capacity to tackle complex challenges, such as risk communication, but require further testing. Insights into the design and implementation of such interdisciplinary workshops are given (e.g. team design, use of preparatory materials, and engagement of specialists and local stakeholders are presented), including critiques of challenges raised by the workshop participants. Guidance is provided to those interested in applying a Pressure Cooker approach and further adaptations of the approach are welcomed
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Visualizing volcanic ash forecasts: scientist and stakeholder decisions using different graphical representations and conflicting forecasts
During volcanic eruptions, Volcanic Ash Advisory Centres issue ash advisories for aviation showing the forecasted outermost extent of the ash cloud. During the 2010 Icelandic volcano Eyjafjallajökull eruption, the UK Met Office produced supplementary forecasts of quantitative ash concentration, due to demand from airlines. Additionally, satellite retrievals of estimated volcanic ash concentration are now available. To test how these additional graphical representations of volcanic ash affect flight decisions, whether users infer uncertainty in graphical forecasts of volcanic ash, and how decisions are made when given conflicting forecasts, a survey was conducted of 25 delegates representing UK research and airline operations dealing with volcanic ash. Respondents were more risk-seeking with safer flight paths and risk-averse with riskier flight paths when given location and concentration forecasts compared to when given only the outermost extent of the ash. Respondents representing operations were more risk-seeking than respondents representing research. Additionally, most respondents' hand-drawn no-fly zones were larger than the areas of unsafe ash concentrations in the forecasts. This conservatism implies that respondents inferred uncertainty from the volcanic ash concentration forecasts. When given conflicting forecasts, respondents became more conservative than when given a single forecast. The respondents were also more risk-seeking with high-risk flight paths and more risk-averse with low-risk flight paths when given conflicting forecasts than when given a single forecast. The results show that concentration forecasts seem to reduce flight cancellations while maintaining safety. Open discussion with the respondents suggested that definitions of "uncertainty" may differ between research and operations
Vegetable Shipping Line Graph Testing Survey
Survey results from both an online and in-paper survey designed to determine if how uncertainty information was displayed changed users' decisions from and interpretations of the data. Participants for the survey were recruited in different ways to target different audiences
Volcanic Ash Workshop Survey Results
Survey results from the 22 February 2016 Volcanic Ash Workshop with user groups from research and operations. Users included pilots, the civil aviation association, representatives from airlines, engine manufacturers, forecasters from the UK Met Office, and researchers from academia. Survey was a decision-making game for flight paths given different forecasts. The purpose of the survey was to see how decisions change if given different risk levels or different ways of displaying the information
Eye Tracking of Vegetable Shipping Line Graph Testing Survey
Eye-tracking and survey results from a survey designed to determine if how uncertainty information was displayed changed users’ decisions from and interpretations of the data. Participants for the survey were 65 students from the University of Reading. Participants were recruited by email. They received £10 for participating in the experiment
Design skills for environmental risk communication. Design in and design of an interdisciplinary workshop
Effective environmental risk management and risk reduction requires an inherently interdisciplinary and cross-sector approach to communication design. The challenging global impact of this area can only be addressed by increasing skills capacity in communication design across disciplines, a challenge which itself requires the design and delivery of new expert training. This paper reports on the design of and findings from an interdisciplinary, problem-based workshop to build risk communication skills, held at the World Bank’s Understanding Risk 2018 conference, Mexico City. The workshop combined high competence interdisciplinary participants (including designers) with detailed real-world scenarios in a 24-hour ‘pressure cooker’ working environment, designed by a team of interdisciplinary young professionals. The results show engagement from participants across the disciplines involved, who produced outcomes with a community education and user-centred focus. The workshop highlighted that more direct, critical, engagement from the design community is needed in educating about, and delivering, environmental risk communication
Structures of tetrasilylmethane derivatives C(SiXMe2)4 (X = H, F, Cl, Br) in the gas phase and their dynamic structures in solution.
The structures of the molecules C(SiXMe2)4 (X = H, F, Cl, Br) have been determined by gas electron diffraction (GED). Ab initio calculations revealed nine potential minima for each species, with significant ranges of energies. For the H, F, Cl, and Br derivatives nine, seven, two, and two conformers were modelled, respectively, as they were quantum-chemically predicted to be present in measurable quantities. Variable-temperature 1H and 29Si solution-phase NMR studies and, where applicable, 13C NMR, 1H/29Si NMR shift-correlation, and 1H NMR saturation-transfer experiments are reported for C(SiXMe2)4 (X = H, Cl, Br, and also I). At low temperature in solution two conformers (one C1-symmetric and one C2-symmetric) are observed for each of C(SiXMe2)4 (X = Cl, Br, I), in agreement with the isolated molecule ab initiocalculations carried out as part of this work for X = Cl, Br. C(SiHMe2)4 is present as a single C1-symmetric conformer in solution at the temperatures at which the NMR experiments were performed
Interdisciplinary pressure cooker: environmental risk communication skills for the next generation
This article presents a “pressure cooker” approach for building interdisciplinary risk communication capacity in young professionals via an intensive 24 h workshop. The event successfully brought together 35 participants from around the world to work on real-world environmental hazard/risk communication challenges for two areas in Mexico. Participants worked in interdisciplinary teams, following a three-step iterative process, with support from mentors and a range of specialists to develop risk communication outputs. Feedback surveys indicate that the workshop met its goal of improving participants' knowledge of risk communication and interdisciplinary working. The workshop resulted in an interdisciplinary community of researchers and practitioners, including organisers, participants and supporting specialists, which was still active after the event. It is recommended that such interdisciplinary workshops are used to build the capacity to tackle complex challenges, such as risk communication, but they require further testing. Insights into the design and implementation of such interdisciplinary workshops are given (e.g. team design, use of preparatory materials, and engagement of specialists and local stakeholders are presented), including critiques of challenges raised by the workshop participants. Guidance is provided to those interested in applying a pressure cooker approach and further adaptations of the approach are welcomed
1,4-addition of TMSCCl3to nitroalkenes: efficient reaction conditions and mechanistic understanding
Improved synthetic conditions allow preparation of TMSCCl3 in good yield (70 %) and excellent purity. Compounds of the type NBu4X [X=Ph3SiF2 (TBAT), F (tetrabutylammonium fluoride, TBAF), OAc, Cl and Br] act as catalytic promoters for 1,4-additions to a range of cyclic and acyclic nitroalkenes, in THF at 0–25 °C, typically in moderate to excellent yields (37–95 %). TBAT is the most effective promoter and bromide the least effective. Multinuclear NMR studies (1H, 19F, 13C and 29Si) under anaerobic conditions indicate that addition of TMSCCl3 to TBAT (both 0.13 M) at −20 °C, in the absence of nitroalkene, leads immediately to mixtures of Me3SiF, Ph3SiF and NBu4CCl3. The latter is stable to at least 0 °C and does not add nitroalkene from −20 to 0 °C, even after extended periods. Nitroalkene, in the presence of TMSCCl3 (both 0.13 M at −20 °C), when treated with TBAT, leads to immediate formation of the 1,4-addition product, suggesting the reaction proceeds via a transient [Me3Si(alkene)CCl3] species, in which (alkene) indicates an Si⋅⋅⋅O coordinated nitroalkene. The anaerobic catalytic chain is propagated through the kinetic nitronate anion resulting from 1,4 CCl3− addition to the nitroalkene. This is demonstrated by the fact that isolated NBu4[CH2[DOUBLE BOND]NO2] is an efficient promoter. Use of H2C[DOUBLE BOND]CH(CH2)2CH[DOUBLE BOND]CHNO2 in air affords radical-derived bicyclic products arising from aerobic oxidation
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