| 1. |
- Carleo, Ilaria, et al.
(författare)
-
The Multiplanet System TOI-421*
- 2020
-
Ingår i: Astronomical Journal. - : American Astronomical Society. - 1538-3881 .- 0004-6256. ; 160:3
-
Tidskriftsartikel (refereegranskat)abstract
- We report the discovery of a warm Neptune and a hot sub-Neptune transiting TOI-421 (BD-14 1137, TIC 94986319), a bright (V = 9.9) G9 dwarf star in a visual binary system observed by the Transiting Exoplanet Survey Satellite (TESS) space mission in Sectors 5 and 6. We performed ground-based follow-up observations-comprised of Las Cumbres Observatory Global Telescope transit photometry, NIRC2 adaptive optics imaging, and FIbre-fed Echelle Spectrograph, CORALIE, High Accuracy Radial velocity Planet Searcher, High Resolution echelle Spectrometer, and Planet Finder Spectrograph high-precision Doppler measurements-and confirmed the planetary nature of the 16 day transiting candidate announced by the TESS team. We discovered an additional radial velocity signal with a period of five days induced by the presence of a second planet in the system, which we also found to transit its host star. We found that the inner mini-Neptune, TOI-421 b, has an orbital period of P-b = 5.19672 +/- 0.00049 days, a mass of M-b = 7.17 +/- 0.66 M-circle plus, and a radius of R-b = R-circle plus, whereas the outer warm Neptune, TOI-421 c, has a period of P-c = 16.06819 +/- 0.00035 days, a mass of M-c = 16.42(-1.04)(+1.06)M(circle plus), a radius of R-c = 5.09(-0.15)(+0.16)R(circle plus), and a density of rho(c) = 0.685(-0.072)(+0.080) cm(-3). With its characteristics, the outer planet (rho(c) = 0.685(-0.0072)(+0.080) cm(-3)) is placed in the intriguing class of the super-puffy mini-Neptunes. TOI-421 b and TOI-421 c are found to be well-suited for atmospheric characterization. Our atmospheric simulations predict significant Ly alpha transit absorption, due to strong hydrogen escape in both planets, as well as the presence of detectable CH4 in the atmosphere of TOI-421 c if equilibrium chemistry is assumed.
|
|
| 2. |
- Barnes, Michele L., et al.
(författare)
-
Social determinants of adaptive and transformative responses to climate change
- 2020
-
Ingår i: Nature Climate Change. - : Springer Science and Business Media LLC. - 1758-678X .- 1758-6798. ; 10:9, s. 823-828
-
Tidskriftsartikel (refereegranskat)abstract
- To cope effectively with the impacts of climate change, people will need to change existing practices or behaviours within existing social-ecological systems (adaptation) or enact more fundamental changes that can alter dominant social-ecological relationships and create new systems or futures (transformation). Here we use multilevel network modelling to examine how different domains of adaptive capacity-assets, flexibility, organization, learning, socio-cognitive constructs and agency-are related to adaptive and transformative actions. We find evidence consistent with an influence process in which aspects of social organization (exposure to others in social networks) encourage both adaptive and transformative actions among Papua New Guinean islanders experiencing climate change impacts. Adaptive and transformative actions are also related to social-ecological network structures between people and ecological resources that enable learning and the internalization of ecological feedbacks. Agency is also key, yet we show that while perceived power may encourage adaptations, it may discourage more transformative actions. Multilevel network modelling shows that social network exposure promotes both adaptive and transformative responses to climate change among Papua New Guinean islanders. Different social-ecological network structures are associated with adaptation versus transformation.
|
|
| 3. |
- Friedman, Rachel S., et al.
(författare)
-
Beyond the community in participatory forest management : A governance network perspective
- 2020
-
Ingår i: Land use policy. - : Elsevier BV. - 0264-8377 .- 1873-5754. ; 97
-
Tidskriftsartikel (refereegranskat)abstract
- Governance of the environment and natural resources involves interests of multiple stakeholders at different scales. In community-based forest management, organisations outside of communities play important roles in achieving multiple social and ecological objectives. How and when these organisations play a role in the community-based forest management process remains a key question. We applied social network analysis to a case study in Indonesian Borneo to better understand the evolution of interactions between organisational actors, and with communities. NGOs featured most prominently in initiating the permit process, implementing management, and providing other support activities, while also being well-connected to donors and government actors. The network configurations indicated significant cooperation among organisations when initiating the community forest process, while bridging between village and organisational levels characterised all stages of the community forest process. While community-based forest management often evokes images of grassroots efforts and broad local capacity to manage forests, reality shows a more dynamic and heterogeneous picture and broader involvement of different actor types and motivations in Indonesia. These findings can be applied to other countries implementing and expanding their decentralised forest policies.
|
|
| 4. |
- Rhodes, Jonathan R., et al.
(författare)
-
Fundamental insights on when social network data are most critical for conservation planning
- 2020
-
Ingår i: Conservation Biology. - : Wiley. - 0888-8892 .- 1523-1739. ; 34:6, s. 1463-1472
-
Tidskriftsartikel (refereegranskat)abstract
- As declines in biodiversity accelerate, there is an urgent imperative to ensure that every dollar spent on conservation counts toward species protection. Systematic conservation planning is a widely used approach to achieve this, but there is growing concern that it must better integrate the human social dimensions of conservation to be effective. Yet, fundamental insights about when social data are most critical to inform conservation planning decisions are lacking. To address this problem, we derived novel principles to guide strategic investment in social network information for systematic conservation planning. We considered the common conservation problem of identifying which social actors, in a social network, to engage with to incentivize conservation behavior that maximizes the number of species protected. We used simulations of social networks and species distributed across network nodes to identify the optimal state-dependent strategies and the value of social network information. We did this for a range of motif network structures and species distributions and applied the approach to a small-scale fishery in Kenya. The value of social network information depended strongly on both the distribution of species and social network structure. When species distributions were highly nested (i.e., when species-poor sites are subsets of species-rich sites), the value of social network information was almost always low. This suggests that information on how species are distributed across a network is critical for determining whether to invest in collecting social network data. In contrast, the value of social network information was greatest when social networks were highly centralized. Results for the small-scale fishery were consistent with the simulations. Our results suggest that strategic collection of social network data should be prioritized when species distributions are un-nested and when social networks are likely to be centralized.
|
|
| 5. |
- Vives, Maria V., et al.
(författare)
-
Nanogrids : good practices and challenges in the projects in Colombia
- 2020
-
Ingår i: Microgrids for Rural Areas: Research and case studies. - : Institution of Engineering and Technology. ; , s. 421-446
-
Bokkapitel (refereegranskat)abstract
- The Republic of Colombia is a country situated in the northwest of South America, with territories in Central America. In 2005, the interconnected electricity system served 87% of the population, a percentage that is below the 95% average for Latin America and the Caribbean. The Colombian government is making massive efforts to increase the electrification, especially at very remote and rural places. However, there are still several rural communities isolated from the main grid in Colombia. Also, although some communities have already been connected to the distribution system, the security and reliability are still an issue. One key element in the effort of electrification is the use of very small microgrids projects called “nanogrids.” A nanogrid is a small power system that uses a combination of renewable and conventional energy sources to supply power to small local loads. The total load in a nanogrid is typically less than 20 kW, as an industrial site, small rural village. or a household. The generators are primarily based on clean energy such as solar arrays, wind turbines, and fuel cells. In Colombia, the Caribbean coastline, Andes Mountains, and strong agriculture provide the country with abundant distributed renewable energy resources that might largely surpass the fast-growing electricity demand. In this framework, the nanogrids emerge as a solution to supply energy for some communities, located far away from the network, improving the inhabitant's quality of life. Moreover, the nanogrids might improve the security and reliability levels of the distribution system. This chapter discusses good practices and proposed some solutions to overcome challenges detected in nanogrid projects developed in Colombia. In essence, this chapter is a case study of nanogrid systems; it focuses on a full detailed explanation of 23 nanogrid projects developed in Colombia considering location, installed power, purpose, etc. Then the nanogrid projects are evaluated, and it gives the opportunity to identify some characteristics that hinder or benefit the operation of these systems. Some of them are the growth of the demand, the appropriate and inadequate use of energy and drinking water, the changes of habits in the users in the presence of energy or the increase in the reliability of the energy supply and how it affects the maintenance or lack this, the operation of the systems.
|
|
