Results 131 to 140 of about 37,425 (308)
Doppler shift and spread study for ionospherically propagated signals [PDF]
, 1994 Modern, High Frequency (HF) communication techniques, such as spread spectrum and frequency hopping, require precise signal frequency information. The predominant HF propagation path is via the ionosphere, which often produces Doppler frequency shift and
Malachias, Nickolaos.
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Normal Doppler frequency shift in negative refractive-index systems
, 2019 Besides the well-known negative refraction, a negative refractive-index material can exhibit another two hallmark features, which are the inverse Doppler effect and backward Cherenkov radiation.
Baile Zhang (1718578), Xiao Lin (20892)
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Epilepsia, EarlyView.Abstract Objective The latest European Medicines Agency (EMA) guideline on the clinical investigation of medicines to treat epileptic disorders was adopted by the EMA Committee for Medicinal Products for Human Use in 2025. We compared this guideline with the previous version (2010), highlighting areas where significant revisions were introduced ...
Stéphane Auvin +7 more
wiley +1 more source
Defining the end point of status epilepticus: A scoping review and framework for standardization
Epilepsia, EarlyView.Abstract Status epilepticus (SE) is a life‐threatening neurological emergency with consensus‐driven definitions for onset but no standardized criteria for its end point. This gap creates uncertainty in research and clinical practice. We conducted a scoping review to evaluate how end points have been defined in SE research and to identify key areas of ...
Fawad A. Khan +6 more
wiley +1 more source
Doppler shift compensation strategies for LEO satellite communication systems [PDF]
, 2018 Development of signal processing for communication in NGEO systems in order to counteract the high doppler component.Broadband connectivity only covers one third of the earth's surface.
Nieto Yll, Daniel
core +1 more source
Equine Veterinary Journal, EarlyView.Abstract Background Bodyweight, age and breed influence the echocardiographic assessment of foals. There are no echocardiographic studies in Standardbred neonatal foals. Objectives To describe echocardiographic values for selected variables, evaluate intra‐ and inter‐observer variability and assess cardiac changes in the first 5 days of life in healthy
Fernanda Timbó D'el Rey Dantas +8 more
wiley +1 more source
, 2001 If the source of sound and the observer are in relative motion, the sound wave is shifted in frequency. When the motion is separating the source and the observer, the observed frequency decreases, whereas when the motion is bringing the source and the ...
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Equine Veterinary Journal, EarlyView.Abstract Background Acquired indirect inguinal hernia represents a life‐threatening emergency. Therapeutic decision‐making largely depends on intestinal viability, for which specific predictive parameters (such as venous lactate) have not been evaluated.
Raquel Rivero‐García +8 more
wiley +1 more source
Design and numerical simulation of the real-time particle charge and size analyser
, 2012 The electrostatic charge and size distribution of aerosol particles play a very important role in many industrial applications. Due to the complexity and the probabilistic nature of the different charging mechanisms often acting simultaneously, it is ...
Zhang, Lu
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