Results 71 to 80 of about 107,844 (297)

Standalone GPS L1 C/A Receiver for Lunar Missions

Sensors, 2016
Global Navigation Satellite Systems (GNSSs) were originally introduced to provide positioning and timing services for terrestrial Earth users. However, space users increasingly rely on GNSS for spacecraft navigation and other science applications at ...
Vincenzo Capuano, Paul Blunt, Cyril Botteron, Jia Tian, Jérôme Leclère, Yanguang Wang, Francesco Basile, Pierre-André Farine   +7 more
doaj   +1 more source

LANDSAT-4 post launch report 1 [PDF]

LANDSAT-4 (formerly LANDSAT-D) was launched successfully at 1:59 p.m. EDT on July 16, 1982, from Vandenberg Air Force Base. The Delta 3920 launch vehicle performed flawlessly and placed the satellite into the planned three sigma low orbit of 694 km.

core   +1 more source

A permanent magnet hall thruster for pulsed orbit control of lunar polar satellites [PDF]

, 2014
Future Moon missions devoted to Lunar surface remote sensing, for example, will require very _ne and accurate orbit control. It is well known that Lunar satellites in polar orbits will su_er a high increase on the eccentricity due to the gravitational ...
Ferreira, Ivan Soares, Ferreira, José Leonardo, Moraes, Brunno Silva, Mourão, Décio Cardozo, Winter, Othon Cabo   +4 more
core   +1 more source

Ferroelectricity in Antiferromagnetic Wurtzite Nitrides

Advanced Functional Materials, EarlyView.
We establish MnSiN2${\rm MnSiN}_2$ and MnGeN2${\rm MnGeN}_2$ as aristotypes of a new multiferroic wurtzite family that simultaneously exhibits ferroelectricity and antiferromagnetism with altermagnetic spin splitting. By strategically substituting alkaline‐earth metals, we predict new materials with coexisting switchable polarization, spin texture, and
Steven M. Baksa, Lin‐Ding Yuan, Stephen D. Wilson, James M. Rondinelli   +3 more
wiley   +1 more source

Spacecraft design project: Low Earth orbit communications satellite [PDF]

This is the final product of the spacecraft design project completed to fulfill the academic requirements of the Spacecraft Design and Integration 2 course (AE-4871) taught at the U.S. Naval Postgraduate School.
Barfield, Bill, Bruening, Joe, Gardener, Nigel, Golden, Bill, Lashbrook, Dave, Mckibben, Barry, Moroney, Dave, Nottingham, Greg, Rivers, Thane, Wood, Dave   +9 more
core   +1 more source

GPS-derived orbits for the GOCE satellite [PDF]

, 2018
The first ESA (European Space Agency) Earth explorer core mission GOCE (Gravity field and steady-state Ocean Circulation Explorer) was launched on 17 March 2009 into a sun-synchronous dusk-dawn orbit with an exceptionally low initial altitude of about ...
Bock, Heike, Heinze, Markus, Hugentobler, Urs, Jäggi, Adrian, Meyer, Ulrich, van den IJssel, Jose, van Helleputte, Tom, Visser, Pieter   +7 more
core  

Experience with Delay-Tolerant Networking from Orbit [PDF]

, 2010
We describe the first use from space of the Bundle Protocol for Delay-Tolerant Networking (DTN) and lessons learned from experiments made and experience gained with this protocol.
Eddy, W. M., Ivancic, W., Jackson, C., Northam, J., Stewart, D., Wood, L.   +5 more
core   +2 more sources

Covalent Organic Frameworks for Photocatalytic CO2 Reduction: Metal Integration Principles, Strategies and Functions

Advanced Functional Materials, EarlyView.
Covalent organic frameworks (COFs) with metals have been recognized as versatile platforms for photocatalytic CO2 reduction (CO2PRR). Herein, an overview of metal integration strategies for COFs is systematically summarized. Regulatory mechanisms and structure–activity relationships between metal integration and COF‐based CO2PRR are emphasized.
Jie He, Minxian Zhang, Jinqiang Zhang, Hongqi Sun, Shaobin Wang, Xiaoguang Duan   +5 more
wiley   +1 more source

The combined release and radiation effects satellite, a joint NASA/DOD program [PDF]

The Combined Release and Radiation Effects Satellite (CRRES) program is a two-phase joint USAF/NASA program consisting of a low Earth orbit (LEO) phase and a geosynchronous transfer orbit (GTO) phase.
Berrier, D. J.
core   +1 more source

A low earth orbit satellite descent strategy

Technology transfer: fundamental principles and innovative technical solutions
The object of the article is the method of descending a satellite from low Earth orbit (LEO) at the end of its service lifetime for its disposal. The main problem is to ensure a safe and cost-effective disposal of the satellite while minimizing risks to the environment and other objects in orbit.
Berik Zhumazhanov, Abdikul Ashurov, Aigerim Zylgara   +2 more
openaire   +1 more source