Results 61 to 70 of about 2,797,347 (234)

Aerosol Jet Printing of Benzocyclobutene as a Thermally Stable, Low‐Loss Dielectric for Multilayer Microwave Electronics

Advanced Materials Technologies, EarlyView.
Multilayer aerosol jet printed components with a low‐loss, thermally stable dielectric are demonstrated using benzocyclobutene. Ink formulation and in‐line droplet evaporation control support high‐quality, versatile, and stable printing performance. A specialized measurement for low‐loss materials reveals promising microwave properties, which, combined
Md Ramjan Ali, Trent Moritz, Mohammad Tayeb Al Qaseer, Ethan B. Secor   +3 more
wiley   +1 more source

A Spaceborne Radar-Optical Joint Localization and Measurement Scheme for Enhancing Noncooperative Spacecraft Perception

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Localization and measurement of noncooperative spacecrafts in space are of great significance for on-orbit flight safety, rendezvous, and other operations.
Xindi Yu, Ling Wang, Bin Wu, Lutong Zhou, Daiyin Zhu   +4 more
doaj   +1 more source

Synergistic Use of Radar Sentinel-1 and Optical Sentinel-2 Imagery for Crop Mapping: A Case Study for Belgium

Remote Sensing, 2018
A timely inventory of agricultural areas and crop types is an essential requirement for ensuring global food security and allowing early crop monitoring practices.
Kristof Van Tricht, Anne Gobin, Sven Gilliams, Isabelle Piccard   +3 more
doaj   +1 more source

Coordinated optical and radar observations of ionospheric pumping for a frequency pass through the second electron gyroharmonic at HAARP [PDF]

, 2007
On 4 February 2005, the High-frequency Active Auroral Research Program (HAARP) facility was operated in O and X mode while pointing into the magnetic zenith to produce artificial optical emissions in the ionospheric F layer. The pump frequency was set to
Senior, Andrew, Pedersen, T., Kosch, Mike J., Bristow, B., Mishin, E., Watkins, B., Hughes, J., Oyama, S.   +7 more
core   +4 more sources

Liquid‐Crystal‐Based Reconfigurable Intelligent Surface for 7 GHz Mobile Communication

Advanced Materials Technologies, EarlyView.
The glass‐based liquid‐crystal reconfigurable intelligent surface (LC‐RIS) integrates active‐matrix driving and blind‐greedy phase optimization within a 5G‐NR OFDM framework. This enables continuously tunable and autonomous enhancement of wireless coverage. Leveraging the transparency and manufacturability of liquid crystal panels, it is ideally suited
Tien‐Lun Ting, Yuh‐Chyi Chang, Yi‐Chan Hung, Cheng‐Yuan Hsiao, Chao‐Kai Wen, Tsung‐Hsien Lin   +5 more
wiley   +1 more source

On the collocation between dayside auroral activity and coherent HF radar backscatter [PDF]

Annales Geophysicae, 2000
The 2D morphology of coherent HF radar and optical cusp aurora has been studied for conditions of predominantly southward IMF conditions, which favours low-latitude boundary layer reconnection.
J. Moen, J. Moen, H. C. Carlson, S. E. Milan, N. Shumilov, B. Lybekk, P. E. Sandholt, M. Lester   +7 more
doaj   +1 more source

Copper Electroplated TPMS Polymer Lattices for Lightweight Absorption Dominant Electromagnetic Interference Shielding

Advanced Materials Technologies, EarlyView.
Copper electroplating transforms lightweight 3D‐printed TPMS polymer lattices into effective electromagnetic shields. Topology, relative density, and conductive seed layer continuity govern copper penetration, electrical resistance, and attenuation. SEA consistently exceeds SER, while 35% RD Diamond lattice gives the best performance, reaching 48.72 dB
Aman Al Khatib, Fares AlAwwa, Naod Mogos, Abdallah Kamal, Kin Liao, Marwan El Rich, Wael Zaki   +6 more
wiley   +1 more source

Extrinsic Limitations of Stealthy Hyperuniform Devices

Advanced Optical Materials, EarlyView.
Stealthy hyperuniform devices exhibit a scattering‐free angular region whose extent follows a simple quenching equation. Experimental measurements confirm this prediction but reveal quenching efficiencies far below theoretical expectations. Multiple scattering and finite‐size effects are quantified, establishing realistic performance limits for ...
Yuhao Xu, Miao Chen, Louis Forestier, Franck Carcenac, Laurent Mazenq, Philippe Lalanne   +5 more
wiley   +1 more source

An unmanned aerial vehicle light detection and ranging Simultaneous Localisation And Mapping algorithm based on factor graph optimisation for tunnel 3D mapping

IET Radar, Sonar & Navigation
The current mature Simultaneous Localisation And Mapping (SLAM) algorithms, when applied to tunnel scenarios with point cloud degradation and poor lighting conditions, often lead to a sharp increase in the estimated attitude error of the unmanned aerial ...
Jian Xie, Zhuoping Wu, Bing Wang, Aoshu Xu, Yunfei Chen, Jing Li   +5 more
doaj   +1 more source

Visible‐Blind Near‐Infrared Organic Vision Sensors for Imaging in Adverse Environmental Conditions

Advanced Optical Materials, EarlyView.
This work presents high‐performance visible‐blind NIR OPDs enabled by a multilayer optical modulation layer. The devices achieve strong visible‐light suppression and enhanced NIR sensitivity, enabling robust imaging in foggy or low‐light environments.
Baozhong Deng, Kean Lu, Zhouyi Lu, Yi Li, Gaoyu Dai, Luqiao Yin, Zihan Wang, Bruno Grandidier, Tao Xu, Furong Zhu   +9 more
wiley   +1 more source