Results 71 to 80 of about 46,627 (302)

Nuove Prospettive Tecnologiche e di Servizio per l'Aerospazio

GEOmedia, 2018
Advances in technology have split the space community to focus on the miniaturization of conventional satellites, making smaller satellites increasingly popular every day and in recent years several small satellites have been launched (nano, micro and ...
Giovanni Nicolai
doaj   +3 more sources

DEM Generation from Multi Satellite PlanetScope Imagery

Remote Sensing, 2018
Planet Labs have recently launched a large constellation of small satellites (3U cubesats) capable of imaging the whole Earth landmass everyday. These small satellites capture multiple images of an area on consecutive days or sometimes on the same day ...
Sajid Ghuffar
doaj   +1 more source

Optimal dynamic operations scheduling for small-scale satellites

, 2012
A satellite's operations schedule is crafted based on each subsystem/payload operational needs, while taking into account the available resources on-board. A number of operating modes are carefully designed, each one with a different operations plan that
Vasile, Massimiliano, Minisci, Edmondo, Komninou, Eirini   +2 more
core  

Inverse Identification of Energy‐Dependent Laser Absorptivity in NiTi Laser Powder‐Bed Fusion via Calibrated Melt Pool Simulation

Advanced Engineering Materials, EarlyView.
A combined experimental–computational framework identifies energy‐dependent laser absorptivity for NiTi in laser powder‐bed fusion, applicable to conduction and transition modes. Single‐track experiments and thermofluid smoothed particle hydrodynamics simulations are coupled through inverse analysis of melt pool geometry.
Mohamadreza Afrasiabi, Hadi Moutablaleh, Ignatius A. Setiawan, Mehrshad Mehrpouya   +3 more
wiley   +1 more source

Autonomous satellite constellation for enhanced Earth coverage using coupled selection equations

, 2013
This paper presents a novel solution to the problem of autonomous task allocation for a self-organising constellation of small satellites in Earth orbit.
Colombo, Camilla, Mingotti, Giorgio, McInnes, Colin, Mushet, Garrie   +3 more
core  

Enhancing Low‐Temperature Performance of Sodium‐Ion Batteries via Anion‐Solvent Interactions

Advanced Functional Materials, EarlyView.
DOL is introduced into electrolytes as a co‐solvent, increasing slat solubility, ion conductivity, and the de‐solvent process, and forming an anion‐rich solvent shell due to its high interaction with anion. With the above virtues, the batteries using this electrolyte exhibit excellent cycling stability at low temperatures. Abstract Sodium‐ion batteries
Cheng Zheng, Qian Yao, Yanan Sun, Hongyu Lv, Zhongchao Bai, Guoliang Zhang, Nana Wang, Jian Yang   +7 more
wiley   +1 more source

Dual-Purpose Star Tracker and Space Debris Detector: Miniature Instrument for Small Satellites

Journal of Sensor and Actuator Networks
This paper presents the conception, design and real miniature instrument implementation of a dual-purpose sensor for small satellites that can act as a star tracker and space debris detector. In the previous research work, the authors conceived, designed
Beltran N. Arribas, João G. Maia, João P. Castanheira, Joel Filho, Rui Melicio, Hugo Onderwater, Paulo Gordo, R. Policarpo Duarte, André R. R. Silva   +8 more
doaj   +1 more source

High-Efficiency Broadband Planar Array Antenna with Suspended Microstrip Slab for X-Band SAR Onboard Small Satellites. [PDF]

Sensors (Basel), 2021
Anim K, Danuor P, Park SO, Jung YB.
europepmc   +1 more source

Composites of Shellac and Silver Nanowires as Flexible, Biobased, and Corrosion‐Resistant Transparent Conductive Electrodes

Advanced Functional Materials, EarlyView.
Shellac, a centuries‐old natural resin, is reimagined as a green material for flexible electronics. When combined with silver nanowires, shellac films deliver transparency, conductivity, and stability against humidity. These results position shellac as a sustainable alternative to synthetic polymers for transparent conductors in next‐generation ...
Rahaf Nafez Hussein, Tiago Carneiro Gomes, Eliza Ng, Simon Rondeau‐Gagné, Tricia Breen Carmichael   +4 more
wiley   +1 more source

Estimation of Propellant Mass Requirements for Thruster-Driven Momentum Exchange Tether Deployer Vehicles

Aerospace
This article outlines a general approach to determining propellant mass requirements for operating a momentum exchange tether (MET), the rotation of which is driven by traditional thrusters for rideshare payload deployments.
Ben Campbell, Lawrence Dale Thomas
doaj   +1 more source