Results 41 to 50 of about 2,340 (256)

Melt Grafting of Geometry‐Tailored Voltage Stabilizers for High‐Performance Polypropylene Insulation

Advanced Functional Materials, EarlyView.
A scalable one‐step melt grafting strategy is developed to enhance the dielectric properties of isotactic polypropylene by covalently incorporating thermally stable aromatic voltage stabilizers. This solvent‐free approach improves volume resistivity and DC breakdown strength through deep trap formation and charge localization, offering a sustainable ...
Nazirul Mubin bin Normansah, Taehoon Kwon, Hana Kim, Shin‐Ki Hong, Seung Won Lee, Se Hee Lee, Ik‐Su Kwon, Masahiro Kozako, Minhee Kim, Seunggun Yu   +9 more
wiley   +1 more source

Structure–Transport–Ion Retention Coupling for Enhanced Nonvolatile Artificial Synapses

Advanced Functional Materials, EarlyView.
Nitrogen incorporation into the conjugated backbone of donor–acceptor polymers enables efficient charge transfer and deep ion embedding in organic electrochemical synaptic transistors (OESTs). This molecular‐level design enhances non‐volatile synaptic properties, providing a new strategy for developing high‐performance and reliable neuromorphic devices.
Donghwa Lee, Jinsung Kim, Sein Chung, Junho Sung, Chaeyeon Han, Eunho Lee   +5 more
wiley   +1 more source

Load Balancing Based on Cache Resource Allocation in Satellite Networks

IEEE Access, 2019
During a high-speed movement, the satellites are connected intermittently, so the queue length becomes larger and a cache overflow appears. In this paper, the abundant storage resources of the multilayered satellite network (MLSN) are used to avoid the ...
Erbao Wang, Hongyan Li, Shun Zhang
doaj   +1 more source

Satellite-enabled LTE systems in LEO constellations [PDF]

2017 IEEE International Conference on Communications Workshops (ICC Workshops), 2017
LTE-based satellite systems in LEO constellations are a promising solution for extending broadband coverage to areas not connected to a terrestrial infrastructure. However, the large delays and Doppler shifts over the satellite channel pose severe technical challenges to a traditional LTE system.
GUIDOTTI, ALESSANDRO, VANELLI CORALLI, ALESSANDRO, Caus, M., Bas, J., Colavolpe, G., Foggi, T., Cioni, S., Modenini, A., TARCHI, DANIELE   +8 more
openaire   +3 more sources

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

Impact of Solar Irradiance on Low-Earth-Orbit Satellite Orbital Decay During Geomagnetic Storm

Aerospace
In recent years, with the rapid expansion of low-Earth-orbit (LEO) satellite constellations, the orbital decay of LEO satellites caused by atmospheric heating from solar irradiance and geomagnetic activity has become increasingly prominent.
Haiquan Yu, Lue Chen, Bo Chen
doaj   +1 more source

Enhancing Synaptic Plasticity and Multistate Retention of Organic Neuromorphic Devices Using Anion‐Excessive Gel Electrolyte

Advanced Functional Materials, EarlyView.
Anion‐excessive gel‐based organic synaptic transistors (AEG‐OSTs) that can maintain electrical neutrality are developed to enhance synaptic plasticity and multistate retention. Key improvement is attributed to the maintenance of electrical neutrality in the electrolyte even after electrochemical doping, which reduces the Coulombic force acting on ...
Yousang Won, Jeongwoo Lee, Hyunwook Kim, Joon Hak Oh   +3 more
wiley   +1 more source

Navigation Resource Allocation Algorithm for LEO Constellations Based on Dynamic Programming

Remote Sensing
Navigation resource allocation for low-earth-orbit (LEO) constellations refers to the optimal allocation of navigational assets when the number and allocation of satellites in the LEO constellation have been determined.
Sixin Wang, Xiaomei Tang, Jingyuan Li, Xinming Huang, Jiyang Liu, Jian Liu   +5 more
doaj   +1 more source

26-GHz data downlink for LEO satellites [PDF]

2012 6th European Conference on Antennas and Propagation (EUCAP), 2012
State-of-the art downlink technology allows Low Earth Orbit (LEO) satellites for Earth observation (EO) to downlink just above 500 Mb/s in the X-band due to bandwidth limitations. X-band is also becoming very congested. The ITU allocates four times more bandwidth in the 26 GHz band (i.e. 25.5 to 27 GHz) for the EO downlink.
J. Rosello, A. Martellucci, R. Acosta, J. Nessel, L. E. Braten, RIVA, CARLO GIUSEPPE   +5 more
openaire   +2 more sources

Suppression of Photo‐Mediated Traps in Integrated Organic Photovoltaic–Photodetector Devices via N‐Type Self‐Assembly‐Driven Interfacial Engineering

Advanced Functional Materials, EarlyView.
Conventional unstable electron transport layers (ETLs) limit self‐powered organic sensors. This work resolves this by developing a n‐type self‐assembled monolayer (SAM), “3‐PAPh”. This SAM forms a chemically stable and structurally ordered interface that fundamentally suppresses defect formation.
Ohhyun Kwon, Jae Hoon Son, Tae Hyuk Kim, Gyeong Min Lee, Seunghyun Oh, Gayoung Ham, Min Jong Lee, Sang Heon Lee, Seon Joong Kim, Hyojung Cha, Han Young Woo, Jae Won Shim   +11 more
wiley   +1 more source