Results 51 to 60 of about 176,235 (317)

Revisiting broadband performance [PDF]

Proceedings of the 2012 Internet Measurement Conference, 2012
Understanding the empirical characteristics of broadband performance is of intrinsic importance to users and providers, and has been a significant focus of recent efforts by the Federal Communications Commission (FCC)[9]. A series of recent studies have reported results of empirical studies of broadband performance (e.g.,[11,15,22]).
Igor Canadi, Paul Barford, Joel Sommers
openaire   +1 more source

X‐Functionality–Driven Photocatalytic Hydrogen Evolution in 2D 4‐X‐PEA2SnI4 Perovskites

Advanced Functional Materials, EarlyView.
We report a water‐based synthesis of 2D 4‐X‐PEA2SnI4 perovskite microcrystals with prominent photocatalytic (PC) activity for H2 production. The synergy between organic functionalization and HI‐derived iodide scavenges holes suppress octahedral distortion, and favor electron accumulation, enabling a PC H2 evolution ∼20 µmol·g−1 and long‐term stability ...
Taeyeon Kim, Gayoung Seo, Seong Yeon Park, Juwon Jang, Yunho Ahn, Samiksha Mukesh Jain, Samrat Das Adhikari, Harumi Correa‐Leiva, Ignacio Utreras‐Asenjo, Oscar A. Douglas‐Gallardo, Carina Pareja‐Rivera, Kayoung Cho, Byeongsung Kim, Jhonatan Rodriguez‐Pereira, Eunseo Choi, JaeHong Park, Jin Ho Bang, Danilo H. Jara‐Quinteros, Sixto Giménez, Seog Joon Yoon, Andrés F. Gualdrón‐Reyes, Iván Mora‐Seró   +21 more
wiley   +1 more source

Improving Quality of Data: IoT Data Aggregation Using Device to Device Communications

IEEE Access, 2018
With the widespread adaptation of the Internet of things (IoT), we are already witnessing a deluge of IoT data analytics applications. IoT data analytics can be defined as a process to control and optimize decision making in real time, by analyzing huge ...
Sunny Sanyal, Puning Zhang
doaj   +1 more source

Heart Rate Measurement Based on 3D Central Difference Convolution with Attention Mechanism

Sensors, 2022
Remote photoplethysmography (rPPG) is a video-based non-contact heart rate measurement technology. It is a fact that most existing rPPG methods fail to deal with the spatiotemporal features of the video, which is significant for the extraction of the ...
Xinhua Liu, Wenqian Wei, Hailan Kuang, Xiaolin Ma   +3 more
doaj   +1 more source

Unlocking Multi‐Valley Energy Pockets and Interface‐Induced Phonon Filtering in InSb Thermoelectrics by Reaction‐Driven Interface Engineering

Advanced Functional Materials, EarlyView.
InSb, a narrow‐bandgap semiconductor with high carrier mobility, is promising for thermoelectric energy conversion but suffers from high lattice thermal conductivity and strong bipolar conduction. Here, in situ interface engineering using Co2O3 nanoprecursors forms hierarchical CoSbx/In2O3/CoSb3 heterostructures that enhance phonon scattering and ...
Jiwu Xin, Xiao Yang, Xiao‐Lei Shi, Chengyun Xu, Xi Ling, Pengyu Zhang, Jinfeng Dong, Yong Du, Haisheng Chen, Ting Zhang, Zhi‐Gang Chen   +10 more
wiley   +1 more source

Efficient Spatiotemporal Attention Network for Remote Heart Rate Variability Analysis

Sensors, 2022
Studies have shown that ordinary color cameras can detect the subtle color changes of the skin caused by the heartbeat cycle. Therefore, cameras can be used to remotely monitor the pulse in a non-contact manner.
Hailan Kuang, Fanbing Lv, Xiaolin Ma, Xinhua Liu   +3 more
doaj   +1 more source

Orbital Geometry‐Governed Response of Pressure‐Tunable Quantum Defects in hBN

Advanced Functional Materials, EarlyView.
Defects in hBN act as ultrasensitive quantum manometers when the energy of the intradefect optical transitions is modified by lattice compression. The orbital geometry of the electron wave functions governs how electron hopping and Coulomb interactions react uniquely to the reduction of the van der Waals gap and in‐plane compression, leading to robust ...
Magdalena Grzeszczyk, Danis I. Badrtdinov, Kenji Watanabe, Takashi Taniguchi, Cyrus E. Dreyer, Malte Rösner, Maciej Koperski   +6 more
wiley   +1 more source

Broadband learning for doctors [PDF]

BMJ, 2006
Has huge potential but needs funding for high quality content B roadband internet has finally come of age. It's changing the way we listen to music and radio, and it means we can watch television on demand. What could broadband internet do for medical education? Early signs suggest that rapid change is underway, led by the learners.
James, Johnson, Stella, Dutton, Edward, Briffa, Dame Carol, Black   +3 more
openaire   +2 more sources

High‐Index, Low‐Loss Optical Material Platforms for Ultra‐Broadband Ultraviolet‐to‐Visible Achromatic Metalenses

Advanced Functional Materials, EarlyView.
An integrated material platform combining engineered SiNx thin films and printable ZrO2 nanoparticle‐embedded resin enables broadband achromatic metalenses from the ultraviolet to visible range. The demonstrated meta‐optics achieve near‐diffraction‐limited focusing with minimal chromatic aberration.
Hyunjung Kang, Dongmin Jeon, Eunji Lee, Junsuk Rho   +3 more
wiley   +1 more source

Why Broadband? The Meaning of Broadband for Residential Users [PDF]

The Southern African Journal of Information and Communication, 2007
In the society we live in today, access to information is crucial. But because of the increased amount of data as well as the nature of the content, a simple Internet connection is no longer sufficient. The EU government, which has followed an Internet access policy for many years (see eEurope programme), has shifted the focus to broadband Internet ...
Wendy Van den Broeck, Bram Lievens
openaire   +2 more sources