Results 61 to 70 of about 329,493 (296)

Micro-Doppler Effect and Sparse Representation Analysis of Underwater Targets. [PDF]

Sensors (Basel), 2023
Lu Y, Kou S, Wang X.
europepmc   +1 more source

Moving Signals and Their Measured Frequencies

, 2013
In determining the classical Doppler Effect, two assumptions are used for computing the difference in distance travelled by consecutive signals: (a) the receptor is stationary, and (b) the emitter is stationary.
Iyer, Chandru, Prabhu, G. M.
core  

Gut Metabolite Indole‐3‐Propionic Acid Regulates Macrophage Autophagy Through PPT1 Inhibiting Aging‐Related Myocardial Fibrosis

Advanced Science, EarlyView.
IPA is an intestinal tryptophan metabolite whose effects decline with decreased heart function. Supplementing IPA can alleviate the aging‐related myocardial fibrosis through PPT1. PPT1 is a key protein localized to lysosomes, and IPA can restore macrophage autophagy function by regulating PPT1 expresssions, thereby reducing aging‐related myocardial ...
Jing Lu, Hongyan Wang, Haiyu Zhang, Jiahao Li, Hanqi Li, Qiuyu Chen, Dongyu Han, Jialiang Liu, Lin Lv, Jie Xiong, Keying Yuan, Xianpeng Wei, Siqi Sheng, Fukai Liu, Yuanqi Shi, Zengxiang Dong, Yue Li   +16 more
wiley   +1 more source

Spatiotemporal Acoustic Communication by a Single Sensor via Rotational Doppler Effect. [PDF]

Adv Sci (Weinh), 2023
Zhang C, Jiang X, He J, Li Y, Ta D.
europepmc   +1 more source

What is Doppler ultrasound? [PDF]

, 2011
The term Doppler should be capitalized because it refers to Christian Johann Doppler, an Austrian physicist (1803–1853). He described a phenomenon whereby the frequency of sound changes when it is reflected off a moving object.
Vassallo, Pierre
core  

Engineered Probiotic‐Powered Micro‐Rod Robot Bomb for Thrombus‐Penetrating Explosion

Advanced Science, EarlyView.
For thrombotic diseases with narrow therapeutic windows and persistent vascular damage; existing thrombolytic drugs are difficult to achieve precise; timely; and sustained thrombolytic effects. Here an engineered probiotic driven micro‐rod robot for targeted and penetrative treatment for thrombus is developed.
Riyue Liu, Jiale Chen, Yuanyuan Li, Nawsherwan, Cuilian Dai, Yan Wang, Jinrong Zheng, Kecheng Zhou, Mangmang Sang   +8 more
wiley   +1 more source

Rotating axis measurement based on rotational Doppler effect of spliced superposed optical vortex. [PDF]

Nanophotonics, 2023
Zhu X, Qiu S, Liu T, Ding Y, Tang R, Liu Z, Chen X, Ren Y.   +7 more
europepmc   +1 more source

The GRK2/AP‐1 Signaling Axis Mediates Vascular Endothelial Dysfunction and Atherosclerosis Induced by Oscillatory Low Shear Stress

Advanced Science, EarlyView.
This study highlights GRK2 is a central mediator in OSS‐induced endothelial dysfunction. OSS activates GPCRs in endothelial cells, leading to GRK2 phosphorylation and the activation of AP‐1. AP‐1 induces inflammation, while also promoting NR4A1 expression and anchoring LKB1 in the nucleus, which suppresses AMPK activity. This cascade causes endothelial
Li‐Da Wu, Yi Shi, Chao‐Hua Kong, Ai‐Qun Chen, Ying Kang, Jun‐Yan Kan, Xiao‐Min Jiang, Peng Chu, Dong‐Chen Wang, Yi‐Fei Lv, Zhi‐Yuan Qian, Zi‐Hao Jiang, Yun‐Wei Chen, Yue Sun, Rui‐Rui Chang, Wen‐Ying Zhou, Yue Gu, Jun‐Xia Zhang, Shao‐Liang Chen   +18 more
wiley   +1 more source

Evaluation of Doppler Effect Error Affecting the Radio Altimeter Altitude Measurements. [PDF]

Sensors (Basel), 2022
Češkovič M, Kurdel P, Gecejová N, Labun J, Laššák M.   +4 more
europepmc   +1 more source

Laser-driven high-power X- and gamma-ray ultra-short pulse source

, 2008
A novel ultra-bright high-intensity source of X-ray and gamma radiation is suggested. It is based on the double Doppler effect, where a relativistic flying mirror reflects a counter-propagating electromagnetic radiation causing its frequency ...
A. G. Zhidkov, A. S. Pirozhkov, F. V. Hartemann, M. Kando, R. W. Hockney, S. V. Bulanov, S. Wolfram, T. Zh. Esirkepov   +7 more
core   +2 more sources