Results 131 to 140 of about 2,179 (234)

Pan‐Regional Prolonged Droughts Linked to Consecutive La Niña Events

Geophysical Research Letters, Volume 53, Issue 12, 28 June 2026.
Abstract From 2020 to 2023, prolonged droughts affected Central‐West Asia, East Africa, and North America, causing widespread disruptions to regional hydroclimate and ecosystems. These droughts coincided with an unusually persistent cold state of the tropical Pacific associated with consecutive La Niña events.
Teng Zhang, Wenjun Zhang, Feng Jiang, Suqiong Hu, Shanlei Sun, Fei‐Fei Jin, Haishan Chen   +6 more
wiley   +1 more source

Contrasting Mechanisms of Heatwave‐Ozone Pollution Compound Events and Independent Heatwave Events in the Yangtze River Delta

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 11, 16 June 2026.
Abstract Heat waves do not always coincide with ozone pollution, yet the mechanisms controlling their divergence remain insufficiently understood. Here, we investigate why some heat waves evolved into heatwave‐ozone pollution compound events (HWOP), whereas others remained isolated heat wave events (IHW), over the Yangtze River Delta during summer 2024.
Jiaying Pan, Zhanning Huang, Huiling Ouyang, Xiaoyan Wang   +3 more
wiley   +1 more source

A State-of-the-Art Review on CMOS Radio Frequency Power Amplifiers for Wireless Communication Systems. [PDF]

Micromachines (Basel), 2023
Hamid SS, Mariappan S, Rajendran J, Rawat AS, Rhaffor NA, Kumar N, Nathan A, Yarman BS.   +7 more
europepmc   +1 more source

Tropical Pacific Variability Drives Quasi‐Decadal Sea Ice Fluctuations Off East Greenland

Geophysical Research Letters, Volume 53, Issue 11, 16 June 2026.
Abstract The sea ice off East Greenland exhibits pronounced quasi‐decadal fluctuations superimposed on its long‐term decline. Here we show that this low‐frequency variability is tightly phase‐coherent with tropical Pacific quasi‐decadal variability (TPQD), revealing a teleconnection from the tropics to the Arctic.
Rongrong Xu, Wenjun Zhang, Suqiong Hu, Feng Jiang, Leishan Jiang, Fei‐Fei Jin   +5 more
wiley   +1 more source

Performance Enhancement of Dual-Input Frequency-Periodic Load Modulated Power Amplifier at 1–5.7-GHz Bandwidth With Co-Designed Biasing Network

IEEE Access
This study proposes a novel dual input power amplifier (PA) with a frequency-periodic load modulated output matching network supported by a broadband biasing network.
Takuma Torii, Yuji Komatsuzaki, Shintaro Shinjo, Ryo Ishikawa   +3 more
doaj   +1 more source

A Doherty Power Amplifier with Extended Bandwidth and Reconfigurable Back-off Level [PDF]

, 2013
Emerging wireless standards are designed to be spectrally efficient to address the high cost of licensing wireless spectra. Unfortunately, the resulting signals have a high peak-to-average ratio that reduces the base station power amplifier efficiency at
Wu, Yu-Ting David
core  

A High-Relative-Bandwidth Doherty Power Amplifier with Modified Load Modulation Network for Wireless Communications. [PDF]

Sensors (Basel), 2023
Zhu H, Zhang Z, Gu C, Xuan X.
europepmc   +1 more source

Optimal Diagnosis Strategy via Functional Extremum Transformation and Fault Elimination Neural Network: A Minimum Diagnosis-Cost Approach for Complex Systems. [PDF]

Sensors (Basel)
Su Y, Liu Z, Li X, Tang X, Wang M, Wang J.   +5 more
europepmc   +1 more source

160 GHz D-Band Low-Noise Amplifier and Power Amplifier for Radar-Based Contactless Vital-Signs-Monitoring Systems. [PDF]

Micromachines (Basel), 2023
Mustapha AA, Sanduleanu M.
europepmc   +1 more source

New generation of multi-step doherty amplifier

, 2011
This contribution presents an innovative solution to drastically increase the output power range in which the Doherty Power Amplifier shows a high and flat efficiency.
GIANNINI, FRANCO, Colantonio, P, GIOFRE', ROCCO, Giofrè, R, Giannini, F, PIAZZON, LUCA, COLANTONIO, PAOLO, Piazzon, L   +7 more
core