Results 101 to 110 of about 681,192 (361)

First Sagittarius A* Event Horizon Telescope Results. VII. Polarization of the Ring

open access: yesAstrophysical Journal Letters
The Event Horizon Telescope observed the horizon-scale synchrotron emission region around the Galactic center supermassive black hole, Sagittarius A* (Sgr A*), in 2017. These observations revealed a bright, thick ring morphology with a diameter of 51.8 ±
The Event Horizon Telescope Collaboration   +285 more
semanticscholar   +1 more source

Development of High‐Performance Multilayer Monochromators

open access: yesAdvanced Optical Materials, EarlyView.
Detailed insights into the optical and multilayer design of Double Multilayer Monochromators (DMM) are presented and fully characterized, including key optimization strategies and solutions to fabrication challenges. By integrating in‐house Ion Beam Figuring and a high uniformity multilayer coating process, the developed DMMs achieve high reflectivity,
Wadwan Singhapong   +11 more
wiley   +1 more source

Multi-Channel Optical Receiver for Ground-Based Topographic Hyperspectral Remote Sensing

open access: yesRemote Sensing, 2019
Receiver design is integral to the development of a new remote sensor. An effective receiver delivers backscattered light to the detector while optimizing the signal-to-noise ratio at the desired wavelengths. Towards the goal of effective receiver design,
Sean E. Salazar, Richard A. Coffman
doaj   +1 more source

The Influence of On-Orbit Micro-Vibration on Space Gravitational Wave Detection

open access: yesPhotonics, 2023
Large-aperture space telescopes have played an important role in space gravitational wave detection missions. Overcoming the influence of the space environment on interstellar laser distance measurement and realistic high-concentration laser distance ...
Zhiwei Chen   +4 more
doaj   +1 more source

CCAT-prime: a novel telescope for submillimeter astronomy

open access: yes, 2018
The CCAT-prime telescope is a 6-meter aperture, crossed-Dragone telescope, designed for millimeter and sub-millimeter wavelength observations. It will be located at an altitude of 5600 meters, just below the summit of Cerro Chajnantor in the high Atacama
Bazarko, Andrew   +30 more
core   +1 more source

The Daniel K. Inouye Solar Telescope – Observatory Overview

open access: yesSolar Physics, 2020
We present an overview of the National Science Foundation’s Daniel K. Inouye Solar Telescope (DKIST), its instruments, and support facilities. The 4 m aperture DKIST provides the highest-resolution observations of the Sun ever achieved.
T. Rimmele   +73 more
semanticscholar   +1 more source

THE NUCLEAR SPECTROSCOPIC TELESCOPE ARRAY (NuSTAR) HIGH-ENERGY X-RAY MISSION [PDF]

open access: yesAstronomical Telescopes and Instrumentation, 2013
The Nuclear Spectroscopic Telescope Array (NuSTAR) mission, launched on 2012 June 13, is the first focusing high-energy X-ray telescope in orbit. NuSTAR operates in the band from 3 to 79 keV, extending the sensitivity of focusing far beyond the ∼10 keV ...
F. Harrison   +80 more
semanticscholar   +1 more source

Vision‐Assisted Avocado Harvesting with Aerial Bimanual Manipulation

open access: yesAdvanced Robotics Research, EarlyView.
This work outlines the design and implementation of a bimanual aerial robot that employs visual perception and learning to detect, reach, and harvest avocados. A new gripper and fixer arm assembly is used to harvest avocados, while visual perception enables the detection of avocados and estimation of their position and orientation for determining ...
Zhichao Liu   +3 more
wiley   +1 more source

Multi-wavelength visibility measurements of the red giant R Doradus [PDF]

open access: yes, 2000
We present visibility measurements of the nearby Mira-like star R Doradus taken over a wide range of wavelengths (650--990 nm). The observations were made using MAPPIT (Masked APerture-Plane Interference Telescope), an interferometer operating at the 3.9-
Barton, J. R.   +6 more
core   +2 more sources

First Sagittarius A* Event Horizon Telescope Results. VIII. Physical Interpretation of the Polarized Ring

open access: yesAstrophysical Journal Letters
In a companion paper, we present the first spatially resolved polarized image of Sagittarius A* on event horizon scales, captured using the Event Horizon Telescope, a global very long baseline interferometric array operating at a wavelength of 1.3 mm ...
The Event Horizon Telescope Collaboration   +286 more
semanticscholar   +1 more source

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