Results 51 to 60 of about 112,664 (260)

Theoretical and experimental clues to a flux of Doppler transformation energies during processes with energy conservation

Open Physics, 2021
In a microscopic model of the photoelectric effect, it becomes clear that the conservation of energy is exclusively determined by Doppler shift processes, i.e., the whole energy of the photon vanishes by means of Doppler redshifts.
Schultheiss Christoph
doaj   +1 more source

On the Doppler Effect in a Medium

, 1963
This research was supported by the U. S. Air Force through the Air Force Office of Scientific Research of the Air Research and Development Command, under Contract No. AF49(638)-1266. Reproduction in whole or in part is permitted for any purpose of the United States Government. The author is grateful to Professor C. H. Papas for his continued guidance
openaire   +2 more sources

Rapid Fabrication of Self‐Propelled and Steerable Magnetic Microcatheters for Precision Medicine

Advanced Materials, EarlyView.
A rapid Joule heating fabrication method for the production of self‐propelling, adaptive microcatheters, with tunable stiffness and integrated microfluidic channels is presented. Demonstrated through three microrobotic designs, including a steerable guiding catheter, an untethered wave‐crawling TubeBot, and a distal‐end propelled microcatheter, it was ...
Zhi Chen, Boris Rivkin, David Castellanos‐Robles, Ivan Soldatov, Lukas Beyer, Mariana Medina‐Sánchez   +5 more
wiley   +1 more source

Self‐Assembled Inorganic Nanomembrane Tubes: Rolled‐Up Piezoelectrics for Microacoustic Wave‐Based Actuators and Sensors

Advanced Materials, EarlyView.
This study demonstrates a self‐assembly process to generate free‐standing piezoelectric nanomembranes, forming ultracompact microtubular acoustic wave sensors and actuators. The miniaturized 3D piezoelectric platform reported in this work can be applied in telecommunication, energy harvesting, and acoustofluidics. Moreover, the 3D self‐assembly can add
Raphaël C. L‐M. Doineau, Christian N. Saggau, Stefan Baunack, Thomas Gemming, Yara Abdelaal, Robert Weser, Oliver G. Schmidt, Hagen Schmidt, Andreas Winkler, Mariana Medina‐Sánchez   +9 more
wiley   +1 more source

Super‐Resolution Ultrasound Based Cell Tracking With Polymeric Nanobubbles

Advanced Materials, EarlyView.
This study presents a super‐resolution ultrasound platform for tracking cells in vivo. Biocompatible polymeric nanobubbles are used as highly echogenic intracellular labels. Following the injection of cells and microbubbles, ultrasound localization microscopy (ULM) can dynamically match the microvascular architecture and individual cell trajectories ...
Junlin Chen, Xiaoyu Wang, Jilin Fan, Bi Wang, Hanghang Fang, Yurui Wang, Hao Cui, Mohammad Roufarshbaf, Ekaterina Savina, Alexandra Valeske, Quim Peña, Yang Shi, Andreas Herrmann, Twan Lammers, Mathias Hornef, Roman Barmin, Thomas Lisson, Georg Schmitz, Anne Rix, Fabian Kiessling   +19 more
wiley   +1 more source

Velocidade do som no ar e efeito Doppler em um único experimento

Revista Brasileira de Ensino de Física
Esse artigo explica uma modificação do clássico experimento de medida da velocidade do som v s no ar livre pelo metodo de medida de tempo de propagacao de ondas sonoras captados por dois microfones, a fim de obter melhor precisao nas medidas ...
Everton Lüdke, Paola Jardim Cauduro, Alisson Mazzorani Vieira, Rosane Bohrer Adornes   +3 more
doaj   +1 more source

Forced vibration analysis of rock mass under millisecond delay blasting

Yantu gongcheng xuebao, 2019
The frequency spectrum analysis of blasting vibration is the basis of blasting vibration control. Based on the blasting vibration data of the dam foundation blasting excavation of Baihetan hydropower station, the frequency spectrum analysis is carried ...
CHEN Jian-long 1, 2, LU Wen-bo 1, 2, SUN Peng-chang 1, 2, CHEN Ming 1, 2, WANG Gao-hui 1, 2, YAN Peng 1, 2
doaj   +1 more source

A New Approach for Testing Fetal Heart Rate Monitors

Sensors, 2020
In this paper, a new approach for the periodical testing and the functionality evaluation of a fetal heart rate monitor device based on ultrasound principle is proposed.
Daniele Bibbo, Tomas Klinkovsky, Marek Penhaker, Petr Kudrna, Lukas Peter, Martin Augustynek, Vladimír Kašík, Jan Kubicek, Ali Selamat, Martin Cerny, Daniel Bielcik   +10 more
doaj   +1 more source

Errors of UAV Autonomous Landing System for Different Radio Beacon Configurations [PDF]

TransNav, 2019
At the turn of the 20th and 21st centuries, development of microelectronics and microwave techniques allowed for minimization of electronic devices and systems, and the use of microwave frequency bands for modern radio communication systems. On the other
Jan Kelner, Cezary Ziolkowski
doaj   +1 more source

Characterization of Droplet Formation in Ultrasonic Spray Coating: Influence of Ink Formulation Using Phase Doppler Anemometry and Machine Learning

Advanced Materials Technologies, EarlyView.
This study explores how machine learning models, trained on small experimental datasets obtained via Phase Doppler Anemometry (PDA), can accurately predict droplet size (D32) in ultrasonic spray coating (USSC). By capturing the influence of ink complexity (solvent, polymer, nanoparticles), power, and flow rate, the model enables precise droplet control
Pieter Verding, Danny E. P. Vanpoucke, Yunus T. Aksoy, Tobias Corthouts, Maria R. Vetrano, Wim Deferme   +5 more
wiley   +1 more source