Results 151 to 160 of about 27,968 (274)

Achromatic single-layer hologram

Phase retrieval is a fundamental technique of advanced optical technologies, enabling precise control over wavefront properties. A persistent challenge in diffractive optical element (DOE) design is that a single hologram typically operates within a ...
Duan, Huigao, Yuan, Xin, Teng, Dongdong, Li, Zhi, Zhou, Wenhui, Song, Qiang, Cai, Weiwei   +6 more
core  

The achromatic locus: effect of navigation direction in color space

, 2014
An achromatic stimulus is defined as a patch of light that is devoid of any hue. This is usually achieved by asking observers to adjust the stimulus such that it looks neither red nor green and at the same time neither yellow nor blue.
Chauan, Tushar, Xiao, Kaida, Hird, Emily Joanne; id_orcid, Perales, Esther, Hird, Emily, Karatzas, Dimosthenis, Wuerger, Sophie, Chauhan, Tushar   +7 more
core   +1 more source

Intensity-tunable achromatic cascade liquid crystal Pancharatnam-Berry lens

Communications Physics
In the current solution for multiwavelength achromatic flat lenses, a one-to-one correspondence exists between the number of writing phase distributions and the number of achromatic wavelengths.
Zhichang Mo, Yuanan Zhao, Jianguo Wang, Xiaofeng Liu, Changjie Cheng, Yi Chen, Xiangyu Zhu, Yadi Zhao, Kun Wang, Shaozhong Ou, Zhouhao Zhang, Zhaoliang Cao, Qing Cao, Jianda Shao   +13 more
doaj   +1 more source

ACHROMATIC NUMBERS OF MAXIMAL OUTERPLANAR GRAPHS [PDF]

application/pdfA complete k-coloring of a graph ＄G＄ is a map from the vertices of ＄G＄ to ＄k＄ colors such that any two adjacent vertices get different colors and that any two different colors appear on the two endpoints of some edge. The achromatic number
Nakamoto, Atsuhiro, Hara, Shousaku
core   +1 more source

On the achromatic number of signed graphs

, 2019
International audienceIn this paper, we generalize the concept of complete coloring and achromatic number to 2-edge-colored graphs and signed graphs. We give some useful relationships between different possible definitions of such achromatic numbers and ...
Lajou, Dimitri
core  

The Measurement of Contrast Sensitivity in Near Vision: The Use of a Digital System vs. a Conventional Printed Test

Technologies
In recent years, there has been intense development of digital diagnostic tests for vision. All of these tests must be validated for clinical use.
Kevin J. Mena-Guevara, David P. Piñero, María José Luque, Dolores de Fez   +3 more
doaj   +1 more source

The First-fit Chromatic and Achromatic Numbers

, 2009
This project involved pulling together past work on the achromatic and first-fit chromatic numbers, as well as a description of a proof by Yegnanarayanan et al.
Fuller, Stephanie Jenna
core  

Achieving Achromatic and Misalignment-Tolerant Fiber Coupling via Meta-Lens with Structural Interleaving. [PDF]

Nanomaterials (Basel)
Yuan X, Tian Z, Jia B, Zhang Y, Zhou Y, Hu C, Xu Q, Yun F.   +7 more
europepmc   +1 more source

Disordered mosaic metasurfaces with scalable functional density. [PDF]

Nat Commun
Li C, Liu C, Peters C, Yu H, Maier SA, Forbes A, Ren H.   +6 more
europepmc   +1 more source

Habitat Fragmentation in Urbanized Landscapes Favors Bird Species With Darker Plumage. [PDF]

Ecol Evol
Wang Y, Xie J, Liu Y, Yu S, Sheng S, Liao L, Zhang K, Xu Y.   +7 more
europepmc   +1 more source