Results 91 to 100 of about 19,851 (292)

XCVI. The doppler effect in positive rays in hydrogen [PDF]

The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science, 1909
n ...
openaire   +2 more sources

Metasurface‐Enabled Active‐Like Passive Radar

Advanced Science, EarlyView.
A programmable space‐time‐coding metasurface embeds distinct spatiotemporal tags into ambient wireless signals, allowing passive radar to operate in an active‐like manner. By enabling code‐correlated reconstruction under interference, the approach supports robust real‐time UAV tracking in complex environments and points to intelligent, low‐power ...
Mingyi Li, Jiawen Xu, Hanting Zhao, Xu Zhao, Yanjin Chen, Tie Jun Cui, Vincenzo Galdi, Lianlin Li   +7 more
wiley   +1 more source

How maternal position affects umbilical and middle cerebral artery Doppler indices: insights from a scoping review [PDF]

Revista Brasileira de Ginecologia e Obstetrícia
Background: During pregnancy, the maternal supine position may reduce uterine and placental perfusion due to compression of the aorta and inferior vena cava by the gravid uterus, potentially impairing maternal and fetal oxygenation.
Larissa Raso Hammes, Andre Hadyme Miyague, Renato Mitsunori Nisihara   +2 more
doaj   +1 more source

Accurate Direct Positioning in Distributed MIMO Using Delay-Doppler Channel Measurements [PDF]

Distributed multiple-input multiple-output (DMIMO) is a promising technology for simultaneous communication and positioning. However, phase synchronization between multiple access points in D-MIMO is challenging and methods that function without the need
Henriksson, Mikael, Tufvesson, Fredrik, Tufvesson, Fredrik,, Tervo, Nuutti, Leitinger, Erik,, Nelson, Christian, Marti, Gian, Tervo, Nuutti,, Deutschmann, Benjamin,, Marti, Gian; id_orcid, Deutschmann, Benjamin, Leitinger, Erik, Nelson, Christian,, Kosasih, Alva, Henriksson, Mikael,, Marti, Gian,, Kosasih, Alva,   +16 more
core   +1 more source

Positioning Information Based High-Speed Communications with Multiple RISs: Doppler Mitigation and Hardware Impairments

, 2022
In this paper, we consider a multiple reconfigurable intelligent surface (RIS)-assisted system using positioning information (PI) to explore the potential of Doppler effect mitigation and spectral efficiency (SE) enhancement in high-speed communications (
Ke Wang, Benjamin K. Ng, Chan-Tong Lam
core   +1 more source

Asymmetric Electrostrain/Electrobending in Piezoelectric Ceramics: Role of Defect Dipoles or Oxygen Vacancies

Advanced Science, EarlyView.
Defect‐configurational origins of the asymmetric apparent electrostrain are revealed in different piezoelectric ceramics via atomic‐scale visualization of defect configurations. Migration of oxygen vacancies leads to the electrobending effect in N2‐sintered BaTiO3, while defect dipoles in Ba0.99TiO2.99 generate true asymmetric electrostrain without ...
Jie Wang, Geng Huangfu, Hongjie Zhang, Tiannan Yang, Zhenhua Ma, Jingsheng Chen, Yun Liu, Yiping Guo   +7 more
wiley   +1 more source

Leonurine Ameliorates Doxorubicin‐Induced Cardiotoxicity via STING/NF‐κB/NLRP3 Inflammasome Signaling Pathway

Advanced Science, EarlyView.
ABSTRACT Doxorubicin‐induced cardiomyopathy (DIC) remains a dose‐limiting clinical challenge. This study reveals that cardiac vascular endothelial cells (CVECs) act as initial sensors of doxorubicin cardiotoxicity: circulating doxorubicin activates the cGAS‑STING pathway in CVECs, triggering NLRP3 inflammasome‑mediated pyroptosis and release of ...
Wang Jun, Chen Xiaoyang, Xu Jianglin, Yang Zhi, Tao Meijiao, He Jiale, Zhao Jiangfeng, Hei Xuanding, Xu Xuegong, Wang Wei, Li Chun   +10 more
wiley   +1 more source

Programmable Elastic Wave Control Via Mechanical‐Acoustic Interaction in Bistable Metamaterials

Advanced Science, EarlyView.
A mechanically programmable metamaterial based on mechanical‐acoustic interaction enables reconfigurable elastic wave control through bistable state switching. Spatial encoding of peak and valley states tunes band structures and transmission, achieving low‐frequency vibration suppression, waveguiding, and energy localization.
Yuanyuan Li, Yonghua Yu, Chuanqing Chen, Rui Xu, Yulong He, Xin Li, Ming‐Hui Lu, Yan‐Feng Chen   +7 more
wiley   +1 more source

Intrinsically Mitochondria‐Targeting Nanozyme via Coordination‐Assembly of Natural Quercetin for Cascade Antioxidant Therapy of Cerebral Ischemia‐Reperfusion Injury

Advanced Science, EarlyView.
This study uncovers that quercetin naturally targets mitochondria. By coordinating quercetin with Fe3+, we engineer an ultrasmall cascade nanozyme (MCN) with superoxide dismutase‐catalase activities. MCN crosses the damaged blood–brain barrier, scavenges mitochondrial ROS, prevents mitochondrial DNA leakage, and blocks the cGAS‐STING pathway, thereby ...
Wenxuan Zheng, Zhicheng Wang, Xin Zhou, Shuya Wang, Xiaojing Shi, Tingli Xiong, Ruishi Li, Yuting Lin, Zhen Chen, Jiawen Wei, Fei Li, Jinwen Ge, Kelong Ai, Chong Liu, Guiming Deng   +14 more
wiley   +1 more source

A single acoustic beacon-based positioning method for underwater mobile recovery of an AUV

International Journal of Advanced Robotic Systems, 2018
This article presents a navigation method for an autonomous underwater vehicle being recovered by a human-occupied vehicle. The autonomous underwater vehicle is considered to carry underwater navigation sensors such as ultra-short baseline, Doppler ...
Ziye Zhou, Yanqing Jiang, Ye Li, Cao Jian, Yeyi Sun   +4 more
doaj   +1 more source