Results 41 to 50 of about 13,251 (150)

A holonomy characterisation of Fefferman spaces

, 2006
We prove that Fefferman spaces, associated to non--degenerate CR structures of hypersurface type, are characterised, up to local conformal isometry, by the existence of a parallel orthogonal complex structure on the standard tractor bundle.
A. Rod Gover, A. Čap, A. Čap, A. Čap, A. Čap, A. Čap, A. Čap, A. Čap, A.R. Gover, Andreas Čap, C.R. Graham, D. Burns, D.M.J. Calderbank, F. Leitner, K. Yamaguchi, S. Armstrong, S.S. Chern, T.N. Bailey   +17 more
core   +2 more sources

Keeping track of biodiversity in agricultural landscapes: New roles for farmers and naturalists in pollinator monitoring

People and Nature, EarlyView.
Abstract The decline in biodiversity, particularly in agricultural landscapes, is a pressing global challenge. Monitoring is vital to assess biodiversity trends and conservation effectiveness, yet farmland remains underinvestigated. Engaging farmers and encouraging naturalists to take on new roles could help expand monitoring efforts and strengthen ...
Elin Lundquist, Erik Öckinger, Alice L. Mauchline, Ignasi Bartomeus, Stuart Edwards, Michiel F. WallisDeVries, Simon G. Potts, Andy Ruck, René van der Wal   +8 more
wiley   +1 more source

SYN‐A, a naturally derived synergist, restores pyrethroid efficacy against cabbage stem flea beetle but negatively impacts its parasitoid Microctonus brassicae

Pest Management Science, EarlyView.
SYN‐A, a naturally derived synergist, inhibited key metabolic pathways associated with pyrethroid insecticide resistance in cabbage stem flea beetle (CSFB) and its parasitoid Microctonus brassicae. SYN‐A restored pyrethroid efficacy against resistant CSFB allowing up to 80% reduction in application rates.
Patricia A. Ortega‐Ramos, Graham D. Moores, Samantha M. Cook   +2 more
wiley   +1 more source

Control System for the Navigation of the Agricultural Robots: A Review

Journal of Field Robotics, EarlyView.
ABSTRACT Control systems for the navigation of autonomous agricultural robots—particularly those operating in uneven terrain and in the presence of static or dynamic obstacles—have advanced considerably in recent years. As conventional machinery evolves toward increasingly automated systems, the design of reliable navigation controllers has become ...
Edna Carolina Moriones Polanía, Hugo Rafacho Fernandes, Daniel Albiero, Angel Pontin Garcia   +3 more
wiley   +1 more source

Automated Lawn Maintenance: An Agronomic and Operational Review of Turf Health, Biodiversity, and Field Performance

Journal of Field Robotics, EarlyView.
ABSTRACT Grass mowing is one of the most resource‐consuming activities in green maintenance, whether in private areas such as home gardens or in public spaces like urban parks. In recent years, concerns related to climate change, human health, and sustainability have become increasingly prominent in green maintenance, leading manufacturers and industry
Andrea Palladini, Lorenzo Guerrini, Marco Fontanelli, Lucia Bortolini   +3 more
wiley   +1 more source

Assessing the Effects of Biodiesel Production on Sustainability: A Bayesian Two‐Stage Data Envelopment Analysis Approach

Sustainable Development, EarlyView.
ABSTRACT Sustainable development transforms production systems, requiring integrated environmental, social, and economic strategies. Energy systems are key agro‐industrial supply chains in developing countries. Brazil's soybean supply chain impacts Gross Domestic Product, mainly through exports.
Aline Veronese da Silva, Camila Veneo Campos Fonseca, Pedro Gerber Machado, Marcelo Azevedo Costa   +3 more
wiley   +1 more source

Glocal Regenerative Viticulture: Exploring Sustainable Winemaking Strategies in Europe

Sustainable Development, EarlyView.
ABSTRACT The global wine industry is transforming due to climate change challenges. Glocalization is increasingly relevant in winemaking, where geographical and cultural diversity requires context‐specific solutions in the existing sustainability spectrum in viticulture.
Aleksandra N. Volkova, Ekaterina A. Ivanova, Aleksandr K. Vorobev, Flavio P. Martins, Michael E. Akim   +4 more
wiley   +1 more source

Saving Bambi from the mower? Using a drone with thermal camera to evaluate a low‐tech scaring technique to reduce roe deer fawn mortality during grass harvest

Wildlife Biology, EarlyView.
Roe deer is a species that hides their neonates as an anti‐predator strategy. This may prove efficient against mammalian predators, such as the red fox; however, it might be an ecological trap as large numbers of fawns are killed by tractors with harvesters each year during grass harvest.
Thomas Vogler, Neri H Thorsen, Simen Pedersen   +2 more
wiley   +1 more source

Field evaluation of condensed quebracho tannins (CQT) as a white‐tailed deer repellent for soybeans

Wildlife Society Bulletin, EarlyView.
Experimental design of study sites across the sampling area in Wilson County, North Carolina, USA, 2024. Map frame (A) represents the relative area in North Carolina, USA, where we conducted our study. Map frames (B), (C), and (D) represent experimental plots within fields used to assess the effects of condensed quebracho tannins on soybean height ...
Ethan L. Marburger, Rachel Vann, Guy Collins, James Clothier, Christopher S. DePerno   +4 more
wiley   +1 more source

A note on tractor bundles and codimension two spacelike immersions

We study conformal tractor bundles from an extrinsic viewpoint, relating them to codimension two spacelike immersions into Lorentzian manifolds. We show that, at least locally, every Riemannian conformal structure admits a natural realization of its normal conformal tractor bundle as the pullback of the tangent bundle of a suitably constructed ...
openaire   +2 more sources