Results 1 to 10 of about 183 (70)

A red knot as a black swan:How a single bird shows navigational abilities during repeat crossings of the Greenland Icecap [PDF]

Journal of Avian Biology, Volume 51, Issue 8, August 2020., 2020
Despite the wealth of studies on seasonal movements of birds between southern nonbreeding locations and High Arctic breeding locations, the key mechanisms of navigation during these migrations remain elusive.
Able K. P., Alerstam T., Alerstam T., Alerstam T., Alerstam T., Anne Dekinga, Barrie D., Benjamin Gnep, Bent A. C., David C. Douglas, Davidson N. C., Dick W. J. A., Eva M. A. Kok, Gudmundsson G. A., Gudmundsson G. A., Hagstrum J. T., Hijmans R. J., Imboden C., Kok E. M. A., Kuyt E., Morrison R. I. G., Nettleship D. N., Ottosson U., Papi F., Paul W. Howey, Sandberg R., Sandberg R., T. Lee Tibbitts, Taleb N. N., Theunis Piersma, Wallace J. R., Wilson J. R., Wiltschko W., Winkler D. W.   +33 more
core   +3 more sources

Construction of spherical non-circular wheels formed by symmetrical arcs of loxodrome

Eastern-European Journal of Enterprise Technologies, 2023
Bevel gears are used to transmit torque between intersecting axes. They demonstrate high reliability and durability of work, as well as a constant gear ratio. The disadvantage of such a transmission is the mutual sliding of the surfaces of the teeth of the gears, which leads to the emergence of friction forces and wear of their working surfaces.
Tetiana Kresan, Ali Kadhim Ahmed, Serhii Pylypaka, Tatiana Volina, Svіtlana Semirnenko, Viktor Trokhaniak, Irina Zakharova   +6 more
openaire   +3 more sources

Migratory swans individually adjust their autumn migration and winter range to a warming climate

Global Change Biology, Volume 29, Issue 24, Page 6888-6899, December 2023., 2023
Little is known about how migratory animals respond to climate warming in the non‐breeding season, and how such responses can lead to range shifts. Using multi‐year GPS tracks of Bewick's swans, large Arctic‐breeding migratory waterbirds, we examined the effect of temperature on autumn migration and interannual winter distance.
Hans Linssen, E. Emiel van Loon, Judy Z. Shamoun‐Baranes, Rascha J. M. Nuijten, Bart A. Nolet   +4 more
wiley   +1 more source

The agential perspective: Countermapping the modern synthesis

Evolution &Development, Volume 25, Issue 6, Page 335-352, November 2023., 2023
The figure depicts and summarizes two perspectives on the evolution of organisms, from past to present. On the left is a depiction of the Modern Synthesis Perspective, which depicts a gene's‐eye‐view of an organism's evolutionary history from left to right, and identifies the universal dynamics and distortion of biological details that accompany it. On
Denis M. Walsh, Gregory Rupik
wiley   +1 more source

Replacement drives native β‐diversity of British avifauna, while richness differences shape alien β‐diversity

Diversity and Distributions, Volume 29, Issue 1, Page 61-74, January 2023., 2023
Abstract Aim We explored the range shifts of alien and native birds, the responses of alien and native β‐diversity to abiotic factors, and the effect of native diversity on alien β‐diversity in two time periods. Location Great Britain. Time period 1968–1972, 2007–2011. Taxa studied Breeding birds.
Maria Lazarina, Stefanos P. Sgardelis, Danai‐Eleni Michailidou, Mariana Tsianou, Aristi Andrikou‐Charitidou, Konstantinos Touloumis, Athanasios S. Kallimanis   +6 more
wiley   +1 more source

Threading the spindle: a geometric study of chiral liquid crystal polymer microparticles [PDF]

, 2019
Polymeric particles are strong candidates for designing artificial materials capable of emulating the complex twisting-based functionality observed in biological systems.
Ansell, H. S., Kamien, R. D., Katifori, E., Kim, D. S., Lopez-Leon, T.   +4 more
core   +2 more sources

Comparative analysis of the ellipsoid approximation with the sphere [PDF]

, 2023
The paper analyzes the approximation of the ellipsoid by the sphere. Earth is a space body with a mathematically irregular shape, so idealized smooth surfaces are used for calculations.
Bojović, Bogdan, Borisov, Mirko, Novak, Tanja, Petrović, Vladimir, Vrtunski, Milan   +4 more
core   +1 more source

Regional wind patterns likely shape a seasonal migration detour

Journal of Avian Biology, Volume 51, Issue 11, November 2020., 2020
Migrating animals should optimise time and energy use when migrating, travelling directly to their destination. Detours from the most direct route may arise however because of barriers and weather conditions. Identifying how such situations arise from variable weather conditions is crucial to understand population response in the light of increased ...
R. Patchett, W. Cresswell
wiley   +1 more source

Motions about a fixed point by hypergeometric functions: new non-complex analytical solutions and integration of the herpolhode [PDF]

, 2018
We study four problems in the dynamics of a body moving about a fixed point, providing a non-complex, analytical solution for all of them. For the first two, we will work on the motion first integrals. For the symmetrical heavy body, that is the Lagrange-
Ritelli, Daniele, Scarpello, Giovanni Mingari   +1 more
core   +2 more sources

THE LOGARITHMIC SPIRAL AND ITS SPHERICAL COUNTERPART

Journal of Industrial Design and Engineering Graphics, 2020
Logarithmic spirals are isogonal trajectories of pencils of lines. From a series of geometric consequences, we pick out a few which are relevant for kinematics: When a logarithmic spiral rolls on a line, its asymptotic point traces a straight line. Hence,
Hellmuth Stachel, Giorgio Figliolini, Jorge Angeles   +2 more
doaj   +2 more sources