Results 71 to 80 of about 1,304 (240)

Preliminary analysis and design of an optical space surveillance and tracking constellation for LEO coverage

Accurately tracking space debris and operational satellites is the foundation of the long-term sustainability of space operations. To improve upon some of the inherent limitations of ground radars, a constellation of satellites carrying optical sensors ...
D’Anniballe, Antonio, Hobbs, Stephen E., Felicetti, Leonard   +2 more
core   +1 more source

Advancing Tandem Organic Solar Cells With Ternary Acceptor Control for High‐Power Modules and Solar‐to‐Ammonia Conversion

Advanced Functional Materials, EarlyView.
Tandem organic solar cells with optimized ternary acceptor engineering achieved a power conversion efficiency of 15.53% and enabled a high‐voltage mini‐module (Voc 6.11 V). Integration into a bias‐free PV‐EC system further demonstrated efficient solar‐to‐ammonia (STA) conversion (97% Faradaic Efficiency, 4± 2% STA efficiency), highlighting scalable ...
Seyeong Song, Ahmad Tayyebi, Meysam Tayebi, Jungwoo Heo, Jiwoo Yeop, Dohun Yuk, Na Gyeong An, Jaewon Lee, Gi‐Hwan Kim, Maria del Carmen Gimenez Lopez, Ji‐Wook Jang, Jin Young Kim   +11 more
wiley   +1 more source

Heterogeneous Satellite Constellation Design for Cislunar Space Situational Awareness Using Real Options Analysis

, 2023
The number of commercial satellites in Low Earth Orbit (LEO) increased more than four-fold in the decade between 2011 and 2021, a trend that is likely to continue due to the combination of increasingly capable technologies and business models [23] [24 ...
Wachs, Jordan
core  

Self-organising LEO small satellite constellation for 5G MTC and IoT applications

, 2020
: Small satellite constellations are an attractive alternative to provide ubiquitous connectivity to Internet of Things (IoT) and 5G machine-type communication (MTC) applications in areas where terrestrial network coverage is limited. In order to provide
Chef, Olivier, Le Tian, Nicolas Huot, Tian, Le, Famaey, Jeroen, Jeroen Famaey, Huot, Nicolas, Olivier Chef   +7 more
core   +1 more source

Pull‐and‐Push Nanotherapeutic Hydrogels: Scavenging Inflammatory Triggers While Driving Tissue Regeneration in Burn Wounds

Advanced Functional Materials, EarlyView.
A nanounit‐assembled hydrogel employing a “pull‐and‐push” strategy simultaneously scavenges pro‐inflammatory cell‐free DNA (cfDNA) and delivers regenerative therapeutics in response to burn‐induced hyperthermia. By repolarizing macrophages and promoting angiogenesis, this multifunctional platform accelerates burn wound healing, offering a blueprint for
Han‐Sem Kim, Seong‐Jin Shin, Sak Lee, Nandin Mandakhbayar, Ji‐Hye Kang, Da‐Young Kong, Seong‐Doo Hong, Ueon Sang Shin, Hae‐Won Kim, Jung‐Hwan Lee   +9 more
wiley   +1 more source

MXene Wrapped Magnetic Mesocrystals for Durable Redox Catalytic Cancer Therapy and Responsive MRI

Advanced Functional Materials, EarlyView.
Conformal wrapping of ultrathin Ti3C2Tx MXene nanosheets on Fe3O4 mesocrystals creates topology‐stabilized Schottky junctions that direct photoinduced electron transfer under NIR irradiation. The unique architecture sustains Fenton catalysis, promotes continuous hydroxyl radical production, and provides photo‐responsive MRI contrast.
Min Jun Ko, Seongchan Kim, Jun‐Hyeok Han, Sanghee Lee, Minji Ahn, Hong En Fu, Young Jun Jang, Yoo Sang Jeon, Weiguo Li, Young Keun Kim, Dong‐Hyun Kim   +10 more
wiley   +1 more source

Mercator Projection Superposition: A Computationally Efficient Alternative to Grid-Based Coverage Analysis for LEO Mega-Constellations

Applied Sciences
Grid point approaches for LEO mega-constellation coverage analysis become computationally prohibitive for constellations exceeding 103 satellites due to exponential complexity growth.
Guanhua Feng, Linli Lv, Wenhao Li
doaj   +1 more source

Vorticity‐Driven µ‐Platelet Rotation and Selective Packing for Vertical Thermal–Electrical Interconnects

Advanced Functional Materials, EarlyView.
We introduce a capillary‐filtering‐based particle‐filling (CFPF) process that simultaneously forms vertical thermal pathways and electrical vias within µ‐pores. In situ microfluidic analysis reveals that capillary‐driven velocity gradients generate vorticity that governs µ‐platelet rotation and vertical alignment.
Yujin Mun, Sang Gil Lee, Un‐seong Baik, Taeyoon Kwon, Jungyeon Kim, Joo Hwan Shin, Chanho Jeong, Jae‐seung Shim, Yeji Kim, Hyein Jung, Jin‐Tae Kim, Tae‐il Kim   +11 more
wiley   +1 more source

SpaceNet: A Resource-Efficient Simulation Testbed for LEO Mega-Constellation Networks

IEEE Access
The rapid expansion of low Earth orbit (LEO) mega-constellations, such as SpaceX’s Starlink and Amazon’s Kuiper, aim to transform Internet access.
Bruce Barbour, Alexander Kedrowitsch, John Downs, Deven Mhadgut, Suryansh Aryan, Jonathan Black, Samantha Parry Kenyon   +6 more
doaj   +1 more source

Optimal Satellite LEO Constellation Design Based on Global Coverage in One Revisit Time

, 2019
This paper presents a globe coverage of constellation satellite in one revisit and the regional coverage at defined latitude. This constellation seems to be very close to optimal under the maximum revisit time comparing to the results in other papers ...
Saeid Kohani, Peng Zong
core   +1 more source