Results 21 to 30 of about 2,118 (196)
A high transmission tender X-ray monochromator employing a matched pair of multilayer grating and mirror. [PDF]
J Synchrotron RadiatMonochromators based on multilayer gratings can provide a very high throughput on an extended energy range (1 to 5 keV) in the tender X‐ray domain. A multilayer mirror must be associated with the grating to achieve a fixed exit direction. We show how important an accurate modeling of the reflectivity of these two elements is to achieve both an optimal ...
Dennetiere D +11 more
europepmc +2 more sources
From Thin Films to Nanodots: Bottom-Up Integration of Fe<sub>3</sub>O<sub>4</sub> on Nb:STO for Functional Oxide Nanostructures. [PDF]
Adv MaterScalable bottom‐up fabrication of Fe3O4 nanodots on Nb:SrTiO3 using anodic alumina templates enables long‐range ordered arrays with diameters down to 30 nm. STEM highlights the epitaxial growth of Fe3O4 films on Nb:SrTiO3. Complementary polarized neutron reflectometry (PNR) and X‐ray magnetic circular dichroism (XMCD) measurements on continuous films ...
Xu Y +14 more
europepmc +2 more sources
Wind Speed Estimation From CYGNSS Using Artificial Neural Networks
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2020 In this article, a retrieval algorithm based on the use of an artificial neural network (ANN) is proposed for wind speed estimations from cyclone global navigation satellite system (CYGNSS).
Jennifer Reynolds +2 more
doaj +1 more source
THE PERIGEO PROJECT: INERTIAL AND IMAGING SENSORS PROCESSING, INTEGRATION AND VALIDATION ON UAV PLATFORMS FOR SPACE NAVIGATION [PDF]
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2014 The PERIGEO R&D project aims at developing, testing and validating algorithms and/or methods for space missions in various field of research. This paper focuses in one of the scenarios considered in PERIGEO: navigation for atmospheric flights.
P. Molina +5 more
doaj +1 more source
Mission Performance Assessment of the Recovery and Vertical Landing of a Reusable Launch Vehicle
Aerospace, 2023 This paper focuses on the mission analysis of the return trajectory of a Vertical Landing Reusable Launch Vehicle, both for Return-to-Launch-Site (RTLS) and DownRange Landing (DRL) recovery strategies.
Jacopo Guadagnini +2 more
doaj +1 more source
The Space Weather Atmosphere Models and Indices (SWAMI) project: Overview and first results
Journal of Space Weather and Space Climate, 2020 Space weather driven atmospheric density variations affect low Earth orbit (LEO) satellites during all phases of their operational lifetime. Rocket launches, re-entry events and space debris are also similarly affected.
Jackson David R. +15 more
doaj +1 more source
Modelling of Real Time Units in the Verification and Validation Process of Satellite Systems [PDF]
INCAS BulletinVerification and Validation (V&V) methodologies are essential to ensure the correct operations of control algorithms of the embedded software during a satellite mission.
Marius-Daniel MARINESCU +6 more
doaj +1 more source
Earth, Planets and Space, 2021 The JAXA’s Martian Moons Exploration (MMX) mission is planned to reveal the origin of Phobos and Deimos. It will remotely observe both moons and return a sample from Phobos.
Shingo Kameda +30 more
doaj +1 more source
The Astronomical Journal, 1987 Ground-based infrared photometry of Deimos at 4.8, 10, and 20 microns is reported. The observed fluxes are significantly brighter than predicted by the 'standard' thermal model. Recent recalibrations that modify the model beam pattern of the infrared emission are marginally consistent with the observations at 10 and 20, but not at 4.8 microns.
G. J. Veeder +4 more
openaire +1 more source