Results 121 to 130 of about 345,531 (342)

Quantification of Hemodynamic Parameters in Primary Great Saphenous Reflux using Colour Doppler in Clinical Settings and Effect of GSV Ablation on the Venous Arterial Flow Index

, 2022
Manvendu Jha, Ruchira Mukherji, Vishwajeet Mopagar, Kirti Kumari   +3 more
openalex   +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  

Lightlike simultaneity, comoving observers and distances in general relativity

, 2006
We state a condition for an observer to be comoving with another observer in general relativity, based on the concept of lightlike simultaneity. Taking into account this condition, we study relative velocities, Doppler effect and light aberration.
Beem, Bolós, Crawford, Helgason, Misner, Newman, Olivert, Rindler, Sachs, Synge, Vicente J. Bolós   +10 more
core   +1 more source

Curved Bistable Origami‐Inspired Flexible Transcatheter Mitral Valve Clamping

Advanced Science, EarlyView.
A lightweight bistable curved origami dilator combines reversible deformation and high stability, offering a promising solution for minimally invasive mitral valve repair. Abstract Curved origami exhibits remarkable potential for minimally invasive medical applications owing to its unique geometric programmability and mechanical tunability. Building on
Siyu Gao, Fan Jiang, Xiuting Sun, Peng Qi, Jian Xu   +4 more
wiley   +1 more source

Analysis of Multi-Path Fading and the Doppler Effect for Reconfigurable-Intelligent-Surface-Assisted Wireless Networks. [PDF]

Entropy (Basel), 2022
Wu G.
europepmc   +1 more source

AXL Promotes Ischemic Myelin Repair Through Alleviating Myelin Debris Deposition and Lipid Droplets Accumulation

Advanced Science, EarlyView.
Microglial AXL drives white matter repair after stroke by orchestrating the cleanup of myelin debris. Mechanistically, AXL signals through EGR1 to boost Smpd1 transcription, regulating sphingolipid metabolism and preventing lipid droplet toxicity. Restoring the pathway with ASM therapy mitigates damage, positioning AXL as a key node for therapeutic ...
Junqiu Jia, Yonghui Gan, Jia Li, Lilin Li, Hailan Meng, Min Sun, Lei Ye, Rui Mao, Xiang Cao, Shengnan Xia, Xinyu Bao, Renyuan Liu, Meijuan Zhang, Yun Xu   +13 more
wiley   +1 more source

PCDE-Sync: A Time Synchronization Mechanism Based on Partial Clustering and the Doppler Effect for Underwater Acoustic Networks. [PDF]

Comput Intell Neurosci, 2022
Wang J, Ma J, Feng Y, Feng Q, Gao G, Lv Y.   +5 more
europepmc   +1 more source

Data‐Driven Feedback Identifies Focused Ultrasound Exposure Regimens for Improved Nanotheranostic Targeting of the Brain

Advanced Science, EarlyView.
ABSTRACT The blood‐brain barrier (BBB) renders the delivery of nanomedicine in the brain ineffective and the detection of circulating disease‐related DNA from the brain unreliable. Here, we demonstrate that microbubble‐enhanced focused ultrasound (MB‐FUS) mediated BBB opening, supported by large‐data models predict sonication regimens for safe and ...
Hohyun Lee, Victor Menezes, Shiqin Zeng, Chulyong Kim, Cynthia M. Baseman, Jae Hyun Kim, Samhita Padmanabhan, Pranav Premdas, Naima Djeddar, Anton Bryksin, Nikhil Pandey, Pavlos Anastasiadis, Anthony J. Kim, Tobey J. MacDonald, Chetan Bettegowda, Graeme F. Woodworth, Felix J. Herrmann, Costas Arvanitis   +17 more
wiley   +1 more source

Doppler effect described by the solutions of the Cattaneo telegraph equation. [PDF]

Acta Mech, 2021
Povstenko Y, Ostoja-Starzewski M.
europepmc   +1 more source

Effect of prosthetic valve malfunction on the Doppler-catheter gradient relation for bileaflet aortic valve prostheses. [PDF]

, 1993
Helmut Baumgartner, Heinrich Schima, Peter Kühn   +2 more
openalex   +1 more source