Results 21 to 30 of about 2,028,482 (219)

Sympathetic Activation Does Not Affect the Cardiac and Respiratory Contribution to the Relationship between Blood Pressure and Pial Artery Pulsation Oscillations in Healthy Subjects. [PDF]

PLoS ONE, 2015
Using a novel method called near-infrared transillumination backscattering sounding (NIR-T/BSS) that allows for the non-invasive measurement of pial artery pulsation (cc-TQ) and subarachnoid width (sas-TQ) in humans, we assessed the influence of ...
Pawel J Winklewski, Yurii Tkachenko, Kamila Mazur, Jacek Kot, Marcin Gruszecki, Wojciech Guminski, Krzysztof Czuszynski, Jerzy Wtorek, Andrzej F Frydrychowski   +8 more
doaj   +1 more source

Observations of traveling ionospheric disturbances driven by gravity waves from sources in the upper and lower atmosphere [PDF]

Annales Geophysicae
The observed traveling ionospheric disturbances (TIDs) are attributed to atmospheric gravity waves generated by auroral sources in the lower thermosphere or gravity waves generated in the troposphere by midlatitude weather systems.
P. Prikryl, D. R. Themens, D. R. Themens, J. Chum, S. Chakraborty, R. G. Gillies, J. M. Weygand   +6 more
doaj   +1 more source

Wavelet Analysis of Embolic Heart Sound Detected by Precordial Doppler Ultrasound During Continuous Venous Air Embolism in Dogs

Anesthesia & Analgesia, 1998
The spectrum of the embolic heart sounds (EHS) detected by precordial Doppler ultrasound has been previously characterized, but only on small volumes of venous air embolism (VAE). We sought to determine whether real-time wavelet analysis is useful in analyzing the signals of EHS and whether the embolic power of the EHS for larger volumes of air is ...
Lui, PW, Chan, BCB, Chan, FHY, Poon, PWF, Wang, H, Lam, FK   +5 more
openaire   +5 more sources

Ground-based measurements of ionospheric dynamics

Journal of Space Weather and Space Climate, 2018
Different methods are used to research and monitor the ionospheric dynamics using ground measurements: Digisonde Drift Measurements (DDM) and Continuous Doppler Sounding (CDS).
Kouba Daniel, Chum Jaroslav
doaj   +1 more source

Dual Illumination Planar Doppler Velocimetry using a Single Camera [PDF]

, 2003
A Planar Doppler Velocimetry (PDV) illumination system has been designed which is able to generate two beams, separated in frequency by about 600 MHz. This allows a common-path imaging head to be constructed, using a single imaging camera instead of ...
Nobes, David S., Charrett, Thomas O. H., Tatam, Ralph P., Ford, Helen D., David S. Nobes, Helen D. Ford, Ralph P. Tatam, Tom O. H. Charrett   +7 more
core   +1 more source

Multistatic human micro-Doppler classification of armed/unarmed personnel [PDF]

, 2015
Classification of different human activities using multistatic micro-Doppler data and features is considered in this paper, focusing on the distinction between unarmed and potentially armed personnel.
Griffiths, Hugh, Fioranelli, Francesco, Griffiths, H, Ritchie, Matthew, Francesco Fioranelli, Fioranelli, F, Ritchie, M, Hugh Griffiths, Matthew Ritchie   +8 more
core   +1 more source

Acousto-optic frequency switching for single-camera planar Doppler velocimetry [PDF]

, 2001
A single-camera Planar Doppler velocimetry system has been demonstrated, in which illumination beams at two closely-spaced optical frequencies are derived from a single Argon-ion laser.
Nobes, David S., Tatam, Ralph P., Ford, Helen D., David S. Nobes, Helen D. Ford, Ralph P. Tatam   +5 more
core   +1 more source

The March and April 2023 ionospheric storms over Europe

Frontiers in Astronomy and Space Sciences
This paper presents a deep and comprehensive multi-instrumental analysis of two distinct ionospheric storms occurring in March and April 2023. We investigate the ionospheric response in the middle-latitudinal European region utilizing ionospheric ...
Zbyšek Mošna, Veronika Barta, Kitti Alexandra Berényi, Jens Mielich, Tobias Verhulst, Daniel Kouba, Jaroslav Urbář, Jaroslav Chum, Petra Koucká Knížová, Habtamu Marew, Kateřina Podolská, Rumiana Bojilova   +11 more
doaj   +1 more source

The Evolution of Aerosol Jet Printing, A Review: Enhancing Material Versatility and Improvements for Next‐Generation Applications

Advanced Materials Technologies, EarlyView.
Aerosol Jet Printing (AJP) has emerged as a versatile additive manufacturing technique for high‐resolution, conformal, and multi‐material printing. This review highlights advances in printable materials, substrate compatibility, post‐processing, characterization, and process innovations, while critically discussing current challenges and future ...
Chandrachur Chatterjee, Rocco Lupoi, Michael J. Gibbons   +2 more
wiley   +1 more source

Cross‐Scale Hierarchical Targeted Delivery System Based on Small‐Scale Magnetic Robots

Advanced Robotics Research, EarlyView.
This article reviews a cross‐scale hierarchical targeted delivery system that integrates magnetic continuum robots and magnetic microrobots. By combining rapid long‐range navigation with precise microscale targeting, the system overcomes key limitations of single‐scale approaches.
Junjian Zhou, Zhiqiang Chen, Yuanbiao Ma, Zhiqiang Tang, Qianqian Wang   +4 more
wiley   +1 more source