Results 61 to 70 of about 503,018 (197)
Planar, flattened Luneburg lens at infrared wavelengths
Optics Express, 2012 Employing artificially structured metamaterials provides a means of circumventing the limits of conventional optical materials. Here, we use transformation optics (TO) combined with nanolithography to produce a planar Luneburg lens with a flat focal surface that operates at telecommunication wavelengths.
John, Hunt +7 more
openaire +2 more sources
Social cohesion in restoration landscapes: The case of Rwanda
People and Nature, EarlyView.Abstract Ecosystem restoration is recognized as a strategy for addressing landscape degradation. In contexts where ecological degradation overlaps with the deterioration of social cohesion, restoration must also contribute to rebuilding social ties alongside restoring ecosystems.
Valery Ndagijimana +3 more
wiley +1 more source
Ultrashort waveguide tapers based on Luneburg lens
, 2019 In integrated photonic circuits, silicon-on-insulator waveguides with different geometries have been employed to realize a variety of components. Therefore, efficient coupling of two different waveguides is crucial.
M. M. Gilarlue (17494086) +1 more
core +1 more source
IEEE Access, 2019 In this paper, a multi-shell spherical dielectric lens antenna is synthesized to radiate multi-beams with optimum shaped patterns for radio coverage at millimeter wave (mmW) frequencies.
Hsi-Tseng Chou +5 more
doaj +1 more source
Sustainable Development, EarlyView.ABSTRACT This study applies an agency‐theoretical lens to examine how investor heterogeneity, specifically institutional, foreign, and domestic ownership, influences corporate social responsibility (CSR) performance. Drawing on extensions of classical agency theory that account for heterogeneous shareholder preferences and principal‐principal conflicts,
Maximilian Focke
wiley +1 more source
Sustainable Development, EarlyView.ABSTRACT Over recent decades, action‐oriented research has gained prominence in co‐producing actionable knowledge to drive transformative change toward sustainability. However, further methodological developments are needed to support the transition to the application phase of such knowledge.
María D. López‐Rodríguez +7 more
wiley +1 more source
Boreas, EarlyView.Palynological records are central to the biostratigraphic subdivision of the Late Pleistocene in central Europe. Yet many interglacial and interstadial phases—such as the Eemian, Brörup and Odderade—remain only poorly constrained in time due to limited numerical dating.
Michael Hein +19 more
wiley +1 more source
International Journal of Cosmetic Science, EarlyView.This cosmetic clinical study demonstrates improvements in scar appearance associated with the use of a dexpanthenol‐containing silicone gel with an integrated massage ball in adults and children. Abstract Objective To evaluate changes in scar appearance and tolerability associated with 8 weeks of use of a test product comprising a topical dexpanthenol ...
Erwan Peltier +3 more
wiley +1 more source
Theoretical Insights and Analysis Into Luneburg Lens [PDF]
Advancements in wireless communications necessitate innovative antenna designs for radar systems and satellite communications. The Luneburg lens, theorized by Rudolf Luneburg in 1944, is a gradient-index lens capable of focusing electromagnetic waves ...
Flores, Aram
core +1 more source
Directional Acoustic Luneburg Lens Waveguide
, 2022 This paper investigates the acoustic Luneburg Lens (ALL) as a design framework for guiding acoustic wave propagation. In this study, we propose to develop an acoustic waveguide based on the characteristics of both acoustic wave focusing and collimation of cascaded ALLs.
Zhao, Liuxian +2 more
openaire +2 more sources