Results 61 to 70 of about 1,467 (239)

PTFE‐Activated Graphene Overcomes Dispersion Challenges for Scalable Solvent‐Free Fabrication of Ultra‐Thick, High‐Performance Cathodes in Lithium Metal Batteries

Advanced Functional Materials, EarlyView.
PTFE nanoparticle–anchored rGO (rGO@PTFE) for scalable solvent‐free fabrication of ultra‐thick, high‐density cathodes, achieving high conductivity (9.55 S cm−1), lithium transference (0.73), and improved wettability, is developed. The resulting cathode delivers 15.2 mAh cm−2 areal and 563 mAh cm−3 volumetric capacities, with full cells exhibiting 637 ...
Juhee Yoon, Dong Hyuk Kang, Sangmin Shin, Suyoung Yoo, Hyemin Kim, Jin‐Kyun Lee, Hyoung‐Joon Jin, Young Soo Yun   +7 more
wiley   +1 more source

Research on the digital design of LEO constellation systems based on MBSE

Dianxin kexue
Compared to traditional high-throughput satellites and ground networks, low earth orbit (LEO) satellite Internet offers significant advantages such as wide coverage, low latency, broadband capacity, and cost-effectiveness.
ZHANG Peng, WANG Tianshu, MA Wei, ZHANG Shijie, ZHAO Xiangtian, ZHAO Yafei   +5 more
doaj  

Recomposable Layered Metasurfaces for Wavelength‐Multiplexed Optical Encryption via Modular Diffractive Deep Neural Networks

Advanced Functional Materials, EarlyView.
Modular diffractive deep neural network metasurfaces encode and reconstruct holograms across layer combinations and wavelengths, enabling secure, multifunctional operation. Each layer acts independently yet composes jointly, yielding up to m(2N −1) channels for m wavelengths and N layers.
Cherry Park, Youngsun Jeon, Seokho Lee, Yeseul Kim, Junsuk Rho   +4 more
wiley   +1 more source

An LEO Constellation Early Warning System Decision-Making Method Based on Hierarchical Reinforcement Learning. [PDF]

Sensors (Basel), 2023
Cheng Y, Wei C, Sun S, You B, Zhao Y.
europepmc   +1 more source

An Ionic Gelation Powder for Ultrafast Hemostasis and Accelerated Wound Healing

Advanced Functional Materials, EarlyView.
An ultrafast ionic gelation‐activated hemostatic powder (AGCL) forms a hydrogel within ≈1 s upon contact with blood‐derived calcium ions. The AGCL powder enables rapid hemorrhage control, strong tissue adhesion, and enhanced healing. The powder's pre‐crosslinked polymer network ensures high blood uptake and stability, offering effective treatment for ...
Youngju Son, Kyusoon Pak, Taehoon Lee, Monica Celine Prayogo, Jinyoung Choi, Sukkyung Kang, Minjoo Kang, Byungkook Oh, Sang Yu Sun, Sanha Kim, Sung Gap Im, Sangyong Jon, Steve Park   +12 more
wiley   +1 more source

Optimal design of the long-term LEO almanac by considering the atmosphere drag effects

Geo-spatial Information Science
Almanac is an elegant design to help Global Navigation Satellite Systems (GNSS) signal acquisition, which has been adopted by all global satellite navigation systems. For the future low Earth orbit (LEO) navigation constellation, the almanac will be more
Xueli Guo, Lei Wang, You Li
doaj   +1 more source

Improved PPP Ambiguity Resolution with the Assistance of Multiple LEO Constellations and Signals

Remote Sensing, 2019
The fusion of low earth orbit (LEO) constellation and Global Navigation Satellite Systems (GNSS) can increase the number of visible satellites and optimize spatial geometry, which is expected to improve the performance of precise point positioning (PPP ...
Xin Li, Xingxing Li, Fujian Ma, Yongqiang Yuan, Keke Zhang, Feng Zhou, Xiaohong Zhang   +6 more
doaj   +1 more source

A Novel Signal Design and Performance Analysis in NavCom Based on LEO Constellation. [PDF]

Sensors (Basel), 2021
Ji J, Liu Y, Chen W, Wu D, Lu H, Zhang J.   +5 more
europepmc   +1 more source

Zwitterionic Self‐Assembled Monolayer for Simultaneous Noise Suppression and Hole Extraction in High‐Performance Near‐Infrared Organic Photodetectors

Advanced Functional Materials, EarlyView.
This study presents a new hole transporting material (HTM) mechanism for self‐assembled monolayers in near‐infrared organic photodetectors. The formation of zwitterions induces a strong electric field that significantly increases the work function of HTM‐coated indium tin oxide substrates. The devices exhibit low dark current and noise, along with high
Jiyoung Shin, Gyeong Min Lee, Juyeon Shin, Jaewoong Kim, Tae Hyuk Kim, Do Yeon Kim, Myeong In Kim, Kyeounghak Kim, Jae Won Shim, In Hwan Jung   +9 more
wiley   +1 more source

Estimation of Downlink Signal Transmitting Antenna PCO and Equipment Delays for LEO Navigation Constellations with Limited Regional Stations

Remote Sensing
In LEO constellation–augmented navigation, the transmitting antenna phase center offset (PCO) and the equipment delay associated with the downlink signals of LEO satellites constitute major error sources that must be precisely characterized.
Ziqiang Li, Wanke Liu, Jie Hu
doaj   +1 more source