Results 91 to 100 of about 2,132 (298)

Deployment and Coverage Analysis of Typical Large-Scale LEO Communication Constellations

天地一体化信息网络
Low Earth Orbit (LEO) large-scale communication constellations have emerged as a focal point in communication due to their substantial scale and rapid deployment capabilities.
RUAN Yongjing, HU Min, XUE Wen
doaj  

Design of LEO Constellations Providing Internet Services Based on SOC Method

MATEC Web of Conferences, 2017
Narrow-beamwidth antenna is applied to LEO satellite constellations to provide high-speed internet services for the globe. Low-altitude, limited coverage region of single satellite and large scale are the main features of them.
Chen Quan, Bai Yuzhu, Chen Lihu, Pang Ziyan   +3 more
doaj   +1 more source

Scalable Cloud-Based Leo Satellite Constellation Simulator

, 2015
{"references": ["Apache Website. http://www.apache.org/, 2013. (Online; accessed\n15-August-2013).", "C++ SGP4 Satellite Library. http://www.danrw.com/sgp4/, 2013.\n(Online; accessed 15-August-2013).", "Cesium WebGL Virtual Globe and Map Engine. http://cesium.agi.com/,\n2013. (Online; accessed 15-August-2013).", "MySQL Website.
Sobh, Karim, El-Ayat, Khaled, Morcos, Fady, El-Kadi, Amr   +3 more
openaire   +1 more source

Interfacial Modulation for High‐Efficiency Large‐Area Organic Photovoltaics and Perovskite‐Organic Tandem Solar Modules

Advanced Functional Materials, EarlyView.
Self‐assembled monolayers (SAMs) are promising hole‐transporting materials for organic photovoltaics (OPVs), but suffer from self‐aggregation and poor large‐area uniformity. We find that interfacial modification using nicotinic hydrazide can eliminate the residual SAM aggregates by forming energetically favorable complexes, yielding uniform SAM.
Seongwon Yoon, Kangsik Cho, Sungmin Park, Kyeongmin Kim, Hyungju Ahn, Junhyeong Kim, Ahyeon Jin, Uijoon Lee, Yoon Hee Jang, Yongseok Jun, Hae Jung Son   +10 more
wiley   +1 more source

Integration of 5G Technologies in LEO Mega-Constellations [PDF]

, 2017
Alessandro Guidotti, Alessandro Vanelli‐Coralli, Oltjon Kodheli, Giulio Colavolpe, Tommaso Foggi   +4 more
openalex   +1 more source

Auxeticity‐by‐Assembly: Interlocking Modular Auxetic Metamaterials with Selectively Activatable AgNW–Graphene Oxide‐EGaIn Composite Interconnects for Scalable Freeform Photovoltaic Modules

Advanced Functional Materials, EarlyView.
Auxeticity‑by‑Assembly converts freeform photovoltaics from cut‑defined layouts to assembly‑defined systems. Standardized interlocking units generate negative‑Poisson‑ratio, reconfigurable architectures, while hinge regions are wired by selectively activatable AgNW–GO@EGaIn composite interconnects and a folding‑enabled interconnector layer. A decimeter‑
Seok Joon Hwang, Jiwon Ryu, Dae‐Hee Cho, YoungHoi Cho, Yewon Hwang, Haram Lee, Dong Hoe Kim, Byeong‐Kwon Ju, Seok Chung, Deokjae Choi, Gee Yeong Kim, Heesuk Jung, Taehee Kim, Hyeonggeun Yu, Gabseok Seo, Phillip Lee   +15 more
wiley   +1 more source

Challenges to Space Activities in the Context of Mega Satellite Constellations: A Focus on Environmental Impacts

Journal of Astronomy and Space Sciences
The advent of low Earth orbit (LEO) mega satellite constellations to accelerate high-speed internet worldwide represents a new technological advancement.
Sheer
doaj   +1 more source

A Methodology to Repair or Deorbit LEO Satellite Constellations

, 2020
Goksel Gurgenburan
openalex   +2 more sources

Polymer Network Modified Perovskite for High‐Performance Pure Blue Light‐Emitting Diodes

Advanced Functional Materials, EarlyView.
A polymer network of poly(4‐vinylphenol) (PVPh) is introduced to improve pure blue perovskite light‐emitting diodes. PVPh effectively passivates defects, enhances film morphology, reduces lattice strain, and suppresses ion migration. These effects lead to record device performance, achieving 9.82% external quantum efficiency and stable blue emission at
Zhongkai Yu, Jiawei Hong, Jiaxin Song, Zihao Ren, Ke Zhou, Shengnan Liu, Minhui Yu, Yue Xu, Minjeong Ha, Yongbin Hua, Baodan Zhao, Bo Ram Lee   +11 more
wiley   +1 more source

Enhancing Satellite Non-Terrestrial Networks Through Advanced Constellation Management: Optimizing In-Orbit Resources for NB-IoT

IEEE Open Journal of the Communications Society
This paper presents a novel autonomous management system for satellite-based Non-Terrestrial Networks (NTN). It addresses the challenges of managing the operations of Low Earth Orbit (LEO) constellations for the Internet of Things (IoT), emphasizing ...
Arnau Singla, Anna Calveras, Francesc Betorz, Joan A. Ruiz-De-Azua   +3 more
doaj   +1 more source