Results 21 to 30 of about 188,376 (288)

The effect of background and illumination on color identification of real, 3D objects

open access: yesFrontiers in Psychology, 2013
For the surface reflectance of an object to be a useful cue to object identity, judgments of its color should remain stable across changes in the object's environment. In 2D scenes, there is general consensus that color judgments are much more stable
Sarah Ray Allred, Maria eOlkkonen
doaj   +1 more source

Global Conharmonic Concept Type Nearly Kahler Manifold

open access: yesTikrit Journal of Pure Science, 2023
The concept of permanence conharmonic type Nearly Kahler manifold conditions are obtained when the Nearly Kahler manifold is a manifold conharmonic constant type.
Ali A. Shihab
doaj   +1 more source

Weed infestation of a cereal-legume mixture depending on its concentration and position in a crop rotation

open access: yesActa Agrobotanica, 2012
A field study was carried out in the period 2000-2006 at the Experimental Station in Tomaszkowo belonging to the University of Warmia and Mazury in Olsztyn.
Marta K. Kostrzewska   +2 more
doaj   +1 more source

Arthropods as loss and solution sources in the fruit production on Annona crassiflora Mart. (Annonaceae) trees [PDF]

open access: yesBrazilian Journal of Biology
The Annona crassiflora tree stands are essential for several communities that survive by collecting its fruits, while also helping to protect the Brazilian Cerrado. Additionally, A.
Germano Leão Demolin-Leite
doaj   +1 more source

Ecological Stability Properties of Microbial Communities Assessed by Flow Cytometry

open access: yesmSphere, 2018
Natural microbial communities affect human life in countless ways, ranging from global biogeochemical cycles to the treatment of wastewater and health via the human microbiome.
Zishu Liu   +7 more
doaj   +1 more source

Bees (Hymenoptera: Apidae) present in the flowers of the balsa wood Ochroma lagopus Swartz, 1788 - doi: 10.4025/actascibiolsci.v32i4.7103

open access: yesActa Scientiarum: Biological Sciences, 2010
The flower of balsa wood holds about 10 to 15 mL of nectar, which helps attracting pollinating agents, since the genus Ochroma is incapable of self-fertilization. However, a high mortality of bees is observed in these flowers.
Deodoro Magno Brighenti   +1 more
doaj   +1 more source

Nearly Cosymplectic Manifolds of Constant Type

open access: yesAxioms, 2022
Fundamental identities characterizing a nearly cosymplectic structure and analytical expressions for the first and second structural tensors are obtained in this paper. An identity that is satisfied by the first structural tensor of a nearly cosymplectic
Aligadzhi Rustanov
doaj   +1 more source

Photometric, geometric and perceptual factors in illumination-independent lightness constancy [PDF]

open access: yes, 2006
It has been shown that lightness constancy depends on the articulation of the visual field (Agostini & Galmonte, 1999). However, among researchers there is little agreement about the meaning of “articulation.” Beyond the terminological heterogeneity ...
Agostini, Tiziano, Soranzo, Alessandro
core   +1 more source

Convolutional Color Constancy [PDF]

open access: yes, 2015
Color constancy is the problem of inferring the color of the light that illuminated a scene, usually so that the illumination color can be removed. Because this problem is underconstrained, it is often solved by modeling the statistical regularities of ...
Barron, Jonathan T.
core   +1 more source

Variation in weed infestation of sugar beet (Beta vulgaris L. subsp. vulgaris) depending on the intensity of chemical protection of plantations

open access: yesActa Agrobotanica, 2014
A floristic study was conducted over the period 2010–2012, using the Braun-Blanquet method, under which vegetation relevés were made in sugar beet (Beta vulgaris L. subsp. vulgaris) plantations in Lower Silesia.
Krzysztof Domaradzki   +2 more
doaj   +1 more source

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