Results 51 to 60 of about 16,325 (263)
Keck Primary Mirror Closed-loop Segment Control Using a Vector-Zernike Wavefront Sensor
The Astrophysical JournalWe present the first on-sky segmented primary mirror closed-loop piston control using a Zernike wavefront sensor (ZWFS) installed on the Keck II telescope.
Maïssa Salama +19 more
doaj +1 more source
Influence of Pure Dephasing on Emission Spectra from Single Photon Sources [PDF]
, 2008 We investigate the light-matter interaction of a quantum dot with the electromagnetic field in a lossy microcavity and calculate emission spectra for non-zero detuning and dephasing.
A. Naesby +7 more
core +2 more sources
Structural Color Inkjet Printing With Mie‐Resonant Silicon Nanoparticles
Advanced Materials, EarlyView.Water‐based inks incorporating Mie‐resonant silicon nanoparticles were developed, and their application to structural color inkjet printing was demonstrated. By controlling the nanoparticle size and concentration, coloration covering a wide color gamut was achieved.
Hiroto Yamana +3 more
wiley +1 more source
Study of a MEMS-based Shack-Hartmann wavefront sensor with adjustable pupil sampling for astronomical adaptive optics [PDF]
, 2008 We introduce a Shack-Hartmann wavefront sensor for adaptive optics that enables dynamic control of the spatial sampling of an incoming wavefront using a segmented mirror microelectrical mechanical systems (MEMS) device.
Baranec, Christoph, Dekany, Richard
core +1 more source
Advanced Materials Technologies, EarlyView.This study formulated a 5Y‐PSZ zirconia paste for extrusion‐based additive manufacturing via direct ink writing, producing dense ceramic structures for dental applications. A colloidal approach with 47 vol% nanometric powder and tailored additives optimized rheology and printability.
Juliana de Freitas Gouveia Silva +5 more
wiley +1 more source
An Analysis of Fundamental Waffle Mode in Early AEOS Adaptive Optics Images
, 2005 Adaptive optics (AO) systems have significantly improved astronomical imaging capabilities over the last decade, and are revolutionizing the kinds of science possible with 4-5m class ground-based telescopes.
Anand Sivaramakrishnan +14 more
core +1 more source
Control limitations from distributed sensing: theory and Extremely Large Telescope application [PDF]
, 2013 We investigate performance bounds for feedback control of distributed plants where the controller can be centralized (i.e. it has access to measurements from the whole plant), but sensors only measure differences between neighboring subsystem outputs ...
Sarlette, Alain, Sepulchre, Rodolphe
core +1 more source
Elastomers Combining Damping Efficiency With Rapid Recovery
Advanced Materials Technologies, EarlyView.Double network granular elastomers (DNGEs) combine high energy dissipation under both cyclic loading and high impact with rapid shape recovery. 3D printing enables the production of complex, customizable structures with tailored performance. Recyclable DNGEs retain their properties over multiple recycling cycles.
Eva Baur, Alain Molleyres, Esther Amstad
wiley +1 more source
Advanced Materials Technologies, EarlyView.Transducers convert physical signals into electrical and optical representations, yet each mechanism is bounded by intrinsic trade‐offs across bandwidth, sensitivity, speed, and energy. This review maps transduction mechanisms across physical scale and frequency, showing how heterogeneous integration and multiphysics co‐design transform isolated ...
Aolei Xu +8 more
wiley +1 more source
Astrometry with the Keck-Interferometer: the ASTRA project and its science
, 2008 The sensitivity and astrometry upgrade ASTRA of the Keck Interferometer is introduced. After a brief overview of the underlying interferometric principles, the technology and concepts of the upgrade are presented.
Andrea M. Ghez +44 more
core +1 more source