Results 141 to 150 of about 27,968 (274)
The achromatic number of bounded degree trees
, 1998 The achromatic number ?(G) of a simple graph G is the largest number of colours possible in a proper vertex colouring of G in which each pair of colours appears on at least one edge.
Edwards, Keith +3 more
core +1 more source
Lactate Changes Quantified by fMRS: A Meta‐Analysis
NMR in Biomedicine, Volume 39, Issue 6, June 2026.A systematic meta‐analysis of fMRS studies investigating brain lactate in healthy human subjects was conducted, with experiments categorized according to magnetic field strength, spectroscopic echo time, and task design. Across all included studies, lactate concentration was consistently reported to increase during functional stimulation, showing an ...
Luca Cairone +3 more
wiley +1 more source
Finding Maximum Weight 2‐Packing Sets on Arbitrary Graphs
Networks, Volume 87, Issue 4, Page 404-427, June 2026.ABSTRACT A 2‐packing set for an undirected, weighted graph G=(V,E,w) is a subset 𝒮⊆V such that any two vertices v1,v2∈𝒮 are not adjacent and have no common neighbors. The Maximum Weight 2‐Packing Set problem that asks for a 2‐packing set of maximum weight is NP‐hard.
Jannick Borowitz +2 more
wiley +1 more source
Science in Color: Visualizing Achromatic Knowlegde
, 2019 Bock von Wülfingen B, ed. Science in Color: Visualizing Achromatic Knowlegde.
Bock von Wülfingen, Bettina ; https://orcid.org/
core +1 more source
Methods in Ecology and Evolution, Volume 17, Issue 6, Page 1703-1718, June 2026.Abstract Advances in digital imaging and software tools have provided increasingly accessible datasets and methods for analysing colour evolution. Despite the variety of computational packages available, most rely on colour classification before running analyses.
Shawn T. Schwartz +7 more
wiley +1 more source
Design, Analysis, and Manufacturing of Diffractive Achromatic Optical Systems
MicromachinesThe increasing resolution requirements of imaging optical systems must be satisfied by expanding the aperture of the optical system according to Rayleigh’s criterion, and larger apertures of conventional refractive/reflective optics place a greater ...
Yidi Zheng +5 more
doaj +1 more source
Achromatic Petal‐Shaped Beam Generation and Information Encoding Based on Perfect Vortex Beam
Nanophotonics, Volume 15, Issue 10, 27 May 2026.Based on petal‐shaped beams with controllable topological charge, size, and rotation angle, this work employs a spatially multiplexed all‐dielectric TiO2 transmissive array to numerically achieve achromatic petal‐shaped beams at three wavelengths: 480 nm, 530 nm, and 630 nm. Leveraging their unique intensity distribution and rotational characteristics,
Yilong Ge +10 more
wiley +1 more source
Recent Developments in Deep‐Ultraviolet Flat Optics
Nanophotonics, Volume 15, Issue 10, 27 May 2026.Deep‐ultraviolet flat optics (DUVFO) is emerging as a key platform for next‐generation photonics, enabling advanced functionalities beyond conventional DUV optics. This review outlines materials, devices, and system advances, highlighting wide‐bandgap platforms, while identifying key challenges in dispersion control, characterization, and wafer‐scale ...
Omar A. M. Abdelraouf +2 more
wiley +1 more source
LIGHTNESS CONSTANCY UNDER ACHROMATIC FILTERS
, 2009 Colour constancy in perceptual transparency has been mostly studied using filters partially superimposed on variegated stimuli, that is, on stimuli with areas having one part visible directly and the other part visible through the filter.
DA POS, OSVALDO +7 more
core
Achromatic interfero coronagraphy
, 2000 We report on the first observation run with the Achromatic Interfero Coronagraph (AIC) developed at Observatoire de la Côte d'Azur, France. Observations took place during Fall 97 at Observatoire de Haute Provence, France, with the 1.52 m telescope ...
P. Bely +8 more
core +1 more source