Results 31 to 40 of about 247,048 (296)
Reflective Toraldo pupil for high-resolution millimeter-wave astronomy [PDF]
Applied Optics, 2020 A novel, to the best of our knowledge, beam-shaping reflective surface for high-resolution millimeter/submillimeter-wave astronomy instruments is presented. The reflector design is based on Toraldo’s super-resolution principle and implemented with annulated binary-phase coronae structure inspired by the achromatic magnetic mirror approach. A thin, less
Alexey Shitvov +4 more
openaire +3 more sources
Compact radiative control structures for millimeter astronomy [PDF]
SPIE Proceedings, 2010 We have designed, fabricated, and tested compact radiative control structures, including antireflection coatings and resonant absorbers, for millimeter through submillimeter wave astronomy. The antireflection coatings consist of micromachined single crystal silicon dielectric sub-wavelength honeycombs.
Ari D. Brown +5 more
openaire +1 more source
Study of millimeter wave phase shift in 40 GHz hybrid mode locked lasers [PDF]
, 2009 An investigation into using hybrid mode-locked lasers to implement millimeter wave phase shift is presented. The phase shift is measured directly using a vector network analyzer enabling straightforward characterization of such systems.
Cryan, MJ, Khawaja, BAM
core +1 more source
Electromagnetic reprogrammable coding-metasurface holograms
Nature Communications, 2017 Realizing metasurfaces with reconfigurability, high efficiency, and control over phase and amplitude is a challenge. Here, Li et al. introduce a reprogrammable hologram based on a 1-bit coding metasurface, where the state of each unit cell of the coding ...
Lianlin Li +9 more
doaj +1 more source
Radio Physics and Radio Astronomy, 2016 Purpose: developing the sensor for non-contact measurement and profiling parabolic surfaces of antenna systems in the millimeter and submillimeter range with an aperture diameter up to 2 m.
D. L. Chechetkin +4 more
doaj +1 more source
Electrostatic Superlattices Beyond 1:1 Stoichiometry
Advanced Functional Materials, EarlyView.Polymer‐mediated charge regulation drives two hierarchical routes to higher‐stoichiometry nanoparticle superlattices. Tuning the polymer's molecular weight promotes progressive interstitial filling, transforming ZnS into the fully occupied CaF2${\rm CaF}_2$ lattice. Exchanging polymer assignment between large and small nanoparticles instead breaks CsCl
Binay P. Nayak +7 more
wiley +1 more source
Advanced Functional Materials, EarlyView.The liposome nanoreactor method enables uniform metal nanoparticle synthesis using the interior as a reaction environment. We demonstrate that peptide sequences and lipid compositions act as a functional molecular switch to control reaction environments in liposome nanoreactors.
Yuya Abe +6 more
wiley +1 more source
Astronomy & Astrophysics (CAUCASUS)-VOLUME 2
, 2020 The second volume of the international scientific journal Astronomy & Astrophysics (Caucasus) contains the scientific works delivered as scientific reports by their authors at International Scientific Conference Modern Problems of Astrophysics – II ...
(CAUCASUS), Astronomy & Astrophysics
core +1 more source
The Astrophysical Journal LettersA compact source, G0.02467–0.0727, was detected in Atacama Large Millimeter/submillimeter Array 3 mm observations in continuum and very broad line emission.
Adam Ginsburg +39 more
doaj +1 more source
HIGH-PRECISION MICROWAVE SPECTROMETER WITH SUB-DOPPLER SPECTRAL RESOLUTION
Radio Physics and Radio Astronomy, 2014 Results of improvement of the automated millimeter-wave spectrometer of the Institute of Radio Astronomy NAS–Ukraine aimed at reaching a sub-Doppler resolution on the basis of the Lamb-dip observation are presented.
E. A. Alekseev +2 more
doaj +1 more source