Results 41 to 50 of about 2,582,386 (292)

Testing gravitation with satellite laser ranging and the LARASE experiment [PDF]

The Fourteenth Marcel Grossmann Meeting, 2017
The International Laser Ranging Service (ILRS) provides range measurements of passive satellites around the Earth through the powerful Satellite Laser Ranging (SLR) technique. These very precise measurements of the distance between an on-ground laser station and a satellite equipped with cube corner retro-reflectors (CCRs) make possible precise tests ...
Lucchesi D, Anselmo L, Bassan M, Pardini C, Peron R, Pucacco G, Visco M   +6 more
openaire   +5 more sources

HORIZONTAL POSITION OPTIMAL SOLUTION DETERMINATION FOR THE SATELLITE LASER RANGING SLOPE MODEL [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2016
According to the Gaussian-fit laser echo model and the terrain slope model, the regular mean value theorem and the asymptotic principle of the median point of the double integral mean value theorem are used to derive the optimal solution for the ...
Y. Wang, Y. Ai, Y. Hu, R. Wang
doaj   +1 more source

Analysis and application of 1-way laser ranging data from Wettzell station to LRO [PDF]

, 2012
One-way LR (Laser Ranging) is performed routinely from ILRS (International Laser Ranging Service) ground stations to the LOLA (Lunar Orbiter Laser Altimeter) instrument which is onboard NASA’s LRO (Lunar Reconnaissance Orbiter).
Hussmann, Hauke, Mazarico, Erwan, Smith, David, Neumann, Gregory, McGarry, Jan, Mao, Dandan, Torrence, Mark, Oberst, Jürgen, Herold, Günther, Zuber, Maria, Schreiber, Ullrich, Sven, Bauer, Gläser, Philipp   +12 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

Reduction and analysis of one-way laser ranging data from ILRS ground stations to LRO [PDF]

, 2013
One-way LR (Laser Ranging) is being performed routinely from ILRS (International Laser Ranging Service) ground stations to LOLA (Lunar Orbiter Laser Altimeter), onboard NASA’s LRO (Lunar Reconnaissance Orbiter).
Schreiber, Ulli, Smith, David, Neumann, Gregory, McGarry, Jan, Mao, Dandan, Torrence, Mark, Oberst, Jürgen, Hussmann, Hauke, Zuber, Maria, Mazarico, Erwan, Bauer, Sven, Gläser, Philipp   +11 more
core  

Scaling of laser produced plasma UTA emission down to 3 nm for next generation lithography and short wavelength imaging [PDF]

, 2011
Presented at a poster session at Advances in X-Ray/EUV Optics and Components VI, Monday 22 August 2011, San Diego, California, USAAn engineering prototype high average power 13.5-nm source has been shipped to semiconductor facilities to permit the ...
Deirdre Kilbane, Noboru Yugami, Endo, Akira, Yugami, Noboru, Donnelly, Tony, Jiang, Weihua, O'Sullivan, Gerry, O\u27Gorman, Colm, Li, Bowen, O'Gorman, Colm, Dunne, Padraig, Otsuka, Takamitsu, Kilbane, Deirdre, Cummins, T. (Thomas), Weihua Jiang, Takamitsu Otsuka, Higashiguchi, Takeshi, Akira Endo, O\u27Sullivan, Gerry, Colm O'Gorman, Padraig Dunne, Takeshi Higashiguchi, Gerry O'Sullivan, Bowen Li, Thomas Cummins, Tony Donnelly   +25 more
core   +1 more source

Investigating the Effect of Inclination Angle and the Influence of Scan Parameters on the Appearance and Thermal and Mechanical Properties of Filigree Tension Rods of LPBF‐Manufactured NiTi Shape‐Memory Alloys

Advanced Engineering Materials, EarlyView.
This article investigates the dependence of the properties on the manufacturing orientation in the form of the inclination angle to the build plate of LPBF‐fabricated NiTi rods with a diameter of 150–220 µm. Metallographic, chemical, thermal, and mechanical characterization show behavior under identical manufacturing conditions that ranges from ...
Sandra Herzig, Michael Werner, Christian Rotsch   +2 more
wiley   +1 more source

Influence of TiC and TiN Ceramic Reinforcements on the Microstructure, Thermal Expansion Behavior, and Tensile Properties of Invar 36 Manufactured by Laser Powder Bed Fusion

Advanced Engineering Materials, EarlyView.
This study examines Invar composites reinforced with titanium carbide (TiC) and titanium nitride (TiN) using laser powder bed fusion (LPBF). It presents the influence of reinforcements on microstructure, tensile properties, and thermal expansion. Results show that TiC effectively strengthens Invar while maintaining low thermal expansion, whereas TiN ...
Ayodeji Nathaniel Oyedeji, Natasha Sacks, Johannes Pötschke, Björn Matthey   +3 more
wiley   +1 more source

GNSS Real-Time ZTD/PWV Retrieval Based on PPP with Broadcast Ephemerides

Atmosphere
GNSS precise point positioning (PPP) plays an important role in retrieving atmospheric water vapor values and performing numerical weather prediction. However, traditional PPP relies on real-time orbits and clocks, which require continuous internet or ...
Zongqiu Xu, Shuhao Liu, Yantian Xu, Longjiang Tang, Nannan Yang, Gen Zhang   +5 more
doaj   +1 more source

A novel GNSS precise point positioning method based on spherical harmonic expansion

All Earth, 2023
The Global Navigation Satellite System (GNSS) precise point positioning (PPP) from carrier-phase data is influenced by complex elements. The error sources are divided into two categories according to their relation to the signal propagation path.
Yanchen Cao, Jinyun Guo, Hengyang Guo, Minghao Chang, Chunmei Zhao, Xin Liu   +5 more
doaj   +1 more source