Results 11 to 20 of about 1,181 (82)
The challenges of classifying big genera such as <i>Ipomoea</i>. [PDF]
Taxon, 2023 Abstract Big genera represent a significant proportion of the world's plants. However, comprehensive taxonomic and evolutionary studies of these genera are often complicated by their size and geographic spread. This paper explores the challenges faced in classifying these megadiverse plant groups consequent to the existing tension between ...
Muñoz-Rodríguez P +5 more
europepmc +2 more sources
A stochastic model for estimating sustainable limits to wildlife mortality in a changing world
Conservation Biology, Volume 36, Issue 4, August 2022., 2022 Abstract Human‐caused mortality of wildlife is a pervasive threat to biodiversity. Assessing the population‐level impact of fisheries bycatch and other human‐caused mortality of wildlife has typically relied upon deterministic methods. However, population declines are often accelerated by stochastic factors that are not accounted for in such ...
Oliver Manlik +5 more
wiley +1 more source
Journal of Applied Ecology, Volume 59, Issue 6, Page 1496-1512, June 2022., 2022 We identify the areas of Europe and North Africa that are most sensitive for the specific populations of birds for which sufficient GPS tracking data at high spatial resolution were available. We also map vulnerability hotspots where mitigation at existing EI should be prioritised to reduce collision risks.
Jethro G. Gauld +50 more
wiley +1 more source
Evident but context‐dependent mortality of fish passing hydroelectric turbines
Conservation Biology, Volume 36, Issue 3, June 2022., 2022 Abstract Globally, policies aiming for conservation of species, free‐flowing rivers, and promotion of hydroelectricity as renewable energy and as a means to decarbonize energy systems generate trade‐offs between protecting freshwater fauna and development of hydropower. Hydroelectric turbines put fish at risk of severe injury during passage. Therefore,
Johannes Radinger +2 more
wiley +1 more source
Journal of Applied Ecology, Volume 58, Issue 6, Page 1284-1290, June 2021., 2021 In the context of repowering a wind facility, our results suggest that the relative amount of energy produced, rather than simply the size, spacing or nameplate capacity of the replacement turbines, determines the relative rate of mortality prior to and after repowering.
Manuela Huso +6 more
wiley +1 more source
Estimation of spatiotemporal trends in bat abundance from mortality data collected at wind turbines
Conservation Biology, Volume 35, Issue 1, Page 227-238, February 2021., 2021 Abstract Renewable energy sources, such as wind energy, are essential tools for reducing the causes of climate change, but wind turbines can pose a collision risk for bats. To date, the population‐level effects of wind‐related mortality have been estimated for only 1 bat species. To estimate temporal trends in bat abundance, we considered wind turbines
Christina M. Davy +2 more
wiley +1 more source
Experimental Aspects in the Vibration‐Based Condition Monitoring of Large Hydrogenerators
International Journal of Rotating Machinery, Volume 2017, Issue 1, 2017., 2017 Based on experimental observations on a set of twenty 700 MW hydrogenerators, compiled from several technical reports issued over the last three decades and collected from the reprocessing of the vibration signals recorded during the last commissioning tests, this paper shows that the accurate determination of the journal bearings operating conditions ...
Geraldo Carvalho Brito Junior +4 more
wiley +1 more source
Shock and Vibration, Volume 2017, Issue 1, 2017., 2017 This study presents a numerical investigation using the finite element method on the vibratory behavior of a single spool gas turbine designed for unmanned aerial vehicle applications. The shaft of the rotor‐bearing system is supported on a front bearing composed of a deep groove ball bearing with a vibration absorber element and a rear squeeze film ...
Geraldo Creci +5 more
wiley +1 more source
Experimental Estimation of Journal Bearing Stiffness for Damage Detection in Large Hydrogenerators
Shock and Vibration, Volume 2017, Issue 1, 2017., 2017 Based on experimental pieces of evidence collected in a set of twenty healthy large hydrogenerators, this article shows that the operating conditions of the tilting pad journal bearings of these machines may have unpredictable and significant changes.
Geraldo Carvalho Brito Jr. +3 more
wiley +1 more source
Evidence-Based Complementary and Alternative Medicine, Volume 2017, Issue 1, 2017., 2017 The consumption of medicinal plants has notably increased over the past two decades. People consider herbal products as safe because of their natural origin, without taking into consideration whether these plants contain a toxic principle. This represents a serious health problem.
Angel Josabad Alonso-Castro +7 more
wiley +1 more source