Results 71 to 80 of about 5,988,878 (288)

Effects of the Earth’s Irregular Rotation on the Moon-Based Synthetic Aperture Radar Imaging

IEEE Access, 2019
The Moon-based Synthetic Aperture Radar (SAR) offers an exceptionally wide spatial coverage and short revisit time for the Earth observation. However, the complex imaging geometry in Moon-based SAR-Earth's target motion, where both the Earth's rotation ...
Zhen Xu, Kun-Shan Chen, Guoqing Zhou
doaj   +1 more source

Microstructure Modification of Additively Manufactured Mo–9Si–8B by Annealing and Its Effects on High‐Temperature Mechanical Properties

Advanced Engineering Materials, EarlyView.
Postbuild annealing systematically modifies the phase fractions and morphology of EB‐PBF processed Mo–9Si–8B. Quantitative microstructure–property correlations reveal how controlled phase evolution enhances high‐temperature compressive strength and creep resistance.
Christopher Schmidt, Yong Chen, Georg Hasemann, Benjamin Wahlmann, Carolin Körner, Manja Krüger   +5 more
wiley   +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

Study on Zero-Doppler Centroid Control for GEO SAR Ground Observation

International Journal of Antennas and Propagation, 2014
In geosynchronous Earth orbit SAR (GEO SAR), Doppler centroid compensation is a key step for imaging process, which could be performed by the attitude steering of a satellite platform. However, this zero-Doppler centroid control method does not work well
Yicheng Jiang, Bin Hu, Yun Zhang, Meng Lian, Zhuoqun Wang   +4 more
doaj   +1 more source

Rotary 3D Printing With Integrated Electroplating

Advanced Engineering Materials, EarlyView.
A rotary material extrusion platform integrates localized copper electroplating with printing and encapsulation to fabricate cylindrical polymer–metal structures containing fully embedded, low‐resistance conductive pathways that enable internal Joule heating and thermally activated shape‐memory responses.
Antonio Zagaria, Nicola Larovere, Moslem Mohammadi, Gianluca Percoco, Ali Zolfagharian, Gianni Stano   +5 more
wiley   +1 more source

Signatures of the Martian rotation parameters in the Doppler and range observables

, 2017
The position of a Martian lander is affected by different aspects of Mars' rotational motions: the nutations, the precession, the length-of-day variations and the polar motion.
Marie-Julie Péters, Yseboodt, Marie, Véronique Dehant, Dehant, Véronique, Péters, Marie-Julie, Marie Yseboodt   +5 more
core   +1 more source

Impact of the Process Atmosphere During Hot Isostatic Pressing on the Near‐Surface Composition of an Additively Manufactured Austenitic High‐Interstitial Steel

Advanced Engineering Materials, EarlyView.
A high interstital austenitic steel is additively manufactured and postdensified by HIP to eliminate gas porosity. Thereby, the loss of N and Mn in Ar HIP atmosphere is investigated. Further, HIP using N2 atmosphere is investigated which led to excessive nitride formation.
F. Großwendt, J. Hahn, J. Kimm, S. Weber, J. Lentz   +4 more
wiley   +1 more source

Movement of earth rotation and activities of atmosphere and ocean

, 2001
The rotation of the earth, including the variation of the rotational rate and polar motion, represents the statement of the earth's overall movement and interactions among the solid earth, atmosphere and ocean on a variety of space-time scales. They make
Liao, XH, Zheng, DW, Zhou, YH, Yu, NH
core  

Algorithm for determination of the Earth rotation parameters and geodetic coordinates by using satellite laser data. [PDF]

, 1988
An algorithm for estimation of geodetic parameters by means of a linear estimation theory applying to Satellite Laser Ranging (SLR) data was presented in the former paper of this publication series by the author (Sasaki 1984).
Sasaki, Minoru
core  

Microstructural Evolution and In Situ Formation of TiB and TiC in Ti─5Al─2.5Sn Alloy Processed by Powder Metallurgy

Advanced Engineering Materials, EarlyView.
Accelerated in situ formation of TiB and TiC in Ti–5Al–2.5Sn–B4C is driven by transient liquid phase formation, which enhances particle reactions and microstructural evolution. This process increases hardness and establishes a coupled relationship between sintering temperature and reinforcement content, strongly influencing porosity in the resulting ...
Fernando. Y. Kojima, Juliano. Soyama
wiley   +1 more source