Results 31 to 40 of about 371,826 (345)

Comparative analyses for adaptive radiations [PDF]

open access: yesPhilosophical Transactions of the Royal Society of London. Series B: Biological Sciences, 2000
Biologists generally agree that most morphological variation between closely related species is adaptive. The most common method of comparative analysis to test for co–evolved character variation is based on a Brownian–motion model of character evolution.
P H, Harvey, A, Rambaut
openaire   +2 more sources

On the sensitivity of the capacity enhancement of a TDMA system with adaptive multibeam antennas [PDF]

open access: yes, 1997
The paper presents results for the likely capacity improvement when an adaptive multibeam antenna is used in conjunction with air interface parameters akin to the DCS1800 system.
Beach, MA, Swales, SC, Tsoulos, GV
core   +2 more sources

Threespine Stickleback in Lake Constance: The Ecology and Genomic Substrate of a Recent Invasion

open access: yesFrontiers in Ecology and Evolution, 2021
Invasive species can be powerful models for studying contemporary evolution in natural environments. As invading organisms often encounter new habitats during colonization, they will experience novel selection pressures.
Cameron M. Hudson   +12 more
doaj   +1 more source

FEM investigation of leaky modes in hollow core photonic crystal fibers [PDF]

open access: yes, 2007
Hollow-core holey fibers are promising candidates for low-loss guidance of light in various applications, e.g., for the use in laser guide star adaptive optics systems in optical astronomy.
Burger, S.   +4 more
core   +2 more sources

Radiation hydrodynamics including irradiation and adaptive mesh refinement with AZEuS. I. Methods

open access: yes, 2014
Aims. The importance of radiation to the physical structure of protoplanetary disks cannot be understated. However, protoplanetary disks evolve with time, and so to understand disk evolution and by association, disk structure, one should solve the ...
Dullemond, C. P., Ramsey, J. P.
core   +1 more source

Multiple input control strategies for robust and adaptive climate engineering in a low order 3-box model [PDF]

open access: yes, 2018
A low-order 3-box energy balance model for the climate system is employed with a multivariable control scheme for the evaluation of new robust and adaptive climate engineering strategies using solar radiation management.
Bonetti, F., McInnes, C.
core   +1 more source

Laser-controlled adaptive optic for beam quality enhancement in a multipass thin disk amplifier

open access: yes, 2018
We devise a laser-controlled adaptive optical element which operates intracavity under high intensity radiation. This element substitutes a conventional mechanically deformable mirror and is free of critical heat-sensitive components and electronics. The
Kolbe, Daniel, Lange, Richard
core   +1 more source

Ecological Opportunity In Adaptive Radiation Of Galapagos Endemic Land Snails [PDF]

open access: yes, 2009
The classic evolutionary hypothesis of ecological opportunity proposes that both heterogeneity of resources and freedom from enemies promote phenotypic divergence as a response to increased niche availability.
Crespi, Bernard J., Parent, Christine E.
core   +1 more source

Characterization of the complete chloroplast genome of the woody sow-thistle, Sonchus leptocephalus (Asteraceae) endemic to the Canary Islands

open access: yesMitochondrial DNA. Part B. Resources, 2019
Sonchus leptocephalus belongs to a core member of the woody Sonchus alliance endemic to the Macaronesian Islands in the Atlantic Ocean. The alliance has been subject to intensive investigations of adaptive radiation on oceanic islands.
Hye-Been Kim   +4 more
doaj   +1 more source

Protoplanetary disk fragmentation with varying radiative physics, initial conditions and numerical techniques [PDF]

open access: yes, 2007
We review recent results of SPH simulations of gravitational instability in gaseous protoplanetary disks,emphasizing the role of thermodynamics in both isolated and binary systems.
Gawryszczak, Artur, Mayer, Lucio
core   +1 more source

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