Results 31 to 40 of about 1,473,928 (304)

Station-Keeping Maneuvers for a Geostationary Satellite Using Linear Quadratic Regulator [PDF]

Journal of Astronomy and Space Sciences, 1997
This paper applied one of the well-known optimal control theory, namely, linear quadratic regulator(LQR), to the station-keeping maneuvers(SKM) for a geostationary satellite.
Sunik Lee, Kyu-Hong Choi, Sanguk Lee
doaj  

microRNA‐7‐5p and α‐Synuclein SAA Predict Parkinson's Disease Phenoconversion

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Corroborate blood neuron‐derived extracellular vesicle (NDEV) alpha‐synuclein (αSyn), the CSF αSyn seed amplification assay (αSyn‐SAA), and blood microRNA‐7‐5p (miR‐7‐5p) as markers for Parkinson's disease (PD) phenoconversion and determine if combining these markers would help select subjects who would be more likely to phenoconvert.
Shayan Zadegan, Praveen Velammal, Kanmani Muthiah, Madhu Jatty, Christopher Adams   +4 more
wiley   +1 more source

Satellite Tracking of Cory's Shearwater Migration [PDF]

The Condor, 2000
Abstract Transmitters were attached to four adult male Cory's Shearwaters (Calonectris diomedea) caught at their breeding sites off Crete, Greece, in autumn 1998. The birds had left the Mediterranean by the beginning of December. Two were last recorded in the eastern tropical Atlantic in January/February.
Ristow, Dietrich, Berthold, Peter, Hashmi, Dean, Querner, Ulrich   +3 more
openaire   +2 more sources

Gravity field refinement by satellite to satellite Doppler tracking [PDF]

, 1970
Satellite to satellite Doppler tracking with high resolution of gravity ...
Schwarz, Charles R., Schwarz, C. R.
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

Object Tracking in Satellite Videos Based on Convolutional Regression Network With Appearance and Motion Features

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2020
Object tracking is one of the most important components in numerous applications of computer vision. Remote sensing videos provided by commercial satellites make it possible to extend this topic into the earth observation domain.
Zhaopeng Hu, Daiqin Yang, Kao Zhang, Zhenzhong Chen   +3 more
doaj   +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

Application of Space-Based Orientation Observation in Orbit Determination of BeiDou Satellites

Aerospace
When a navigation constellation depends exclusively on inter-satellite links for autonomous orbit determination, the absence of inertial frame orientation measurements can result in the accumulation of rotational errors across the entire constellation ...
Xiaojie Li, Guangyao Chen, Shanshi Zhou, Ting Zhang, Shan Wu, Lu Zhang, Yingying Zhao, Ying Liu   +7 more
doaj   +1 more source

Model based maximum power point tracking for satellite application

, 2017
For a satellite, the primary power source is the solar energy. The amount of harvested solar energy will determine the depth of discharge of the battery in each orbit. This will in term decides the lifespan of the satellite. Hence, the ability to extract
Lew, Jia Min, null null, Jia Min Lew
core   +1 more source

3D‐Printed Titanium Gyroid Scaffold Structure Integrated With Tough Hybrid Materials for Cartilage Replacement

Advanced Engineering Materials, EarlyView.
This study proposes a potential device design for joint cartilage replacement. Silica‐polytetrahydrofuran (SiO2‐PolyTHF) hybrids with customizable mechanical properties were developed to mimic the characteristics of a natural meniscus. These were synthesized through a two‐pot sol–gel hybrid process.
Yu‐Chien Lin, Gloria R. Young, Francesca Tallia, Reece N. Oosterbeek, Shaaz Ghouse, Edward Spiers, Nupur Kohli, Tom Briggs, Marc Masen, Siwei Li, Ren‐Jei Chung, Jonathan R. T. Jeffers, Julian R. Jones   +12 more
wiley   +1 more source