Results 11 to 20 of about 461,020 (267)
Digital radio and its application in the HF (2-30 MHz) band [PDF]
, 2004 The propagation environment at high frequencies (HF, 2-30 MHz) has a significant impact on the performance of radio systems (especially data communications).
Davies, Nigel Clement
core +7 more sources
HF pump-induced electron heating and artificial airglow at high latitudes: Aspect angle dependence [PDF]
, 2002 Large electron temperature increases (~3000 K) in the ionospheric F-region, produced by powerful HF wave injection, were measured using the EISCAT incoherent scatter radar near Tromsø, Norway, on 7 October 1999.
Rietveld, M. T. +4 more
core +4 more sources
Canadian Respiratory Journal, 2015 1Sleep Research Laboratory, University Health Network Toronto Rehabilitation Institute and Departments of Medicine of the University of Toronto and University Health Network Toronto General Hospital; 2Departments of Medicine of the University of Toronto, Mount Sinai Hospital and University Health Network Toronto General Hospital, Toronto, Ontario ...
T Douglas Bradley, John S Floras
openaire +3 more sources
Ionospheric electron heating, optical emissions, and striations induced by powerful HF radio waves at high latitudes: Aspect angle dependence [PDF]
, 2003 In recent years, large electron temperature increases of 300% (3000 K above background) caused by powerful HF-radio wave injection have been observed during nighttime using the EISCAT incoherent scatter radar near Tromsø in northern Norway.
Rietveld, M. T. +11 more
core +5 more sources
A compact portable HF terminal. [PDF]
, 1994 The paper describes the design philosophy and implementation of a compact, high-performance HF (2-30 MHz) long-range radio system. The system is automatic and can adapt to changes in the propagation and co-channel interference environment. In the design,
Darnell, M. +3 more
core +4 more sources
Persistent enhancement of the HF pump-induced plasma line measured with a UHF diagnostic radar at HAARP [PDF]
, 2006 Plasma lines excited by a powerful, high-frequency (HF) radio wave are studied using data obtained with an ultrahigh frequency (UHF) radar at HAARP (High Frequency Active Auroral Research Program) from 3 to 5 February 2005.
Bernhardt, P. A. +5 more
core +4 more sources
Open Medicine, 2021 Heart failure (HF) is a serious and advanced stage of various cardiac diseases with high mortality and rehospitalization rates. Phosphoglycerate mutase 2 (PGAM2) overexpression was identified in the serum of patients with HF.
Li Min +9 more
doaj +1 more source
Bioingeniøren, 2023 Background/objective: Blood donation is considered to be a safe procedure, however, sometimes vasovagal reactions (VVRs) with various degrees of severity can occur. This paper provides an overview of the incidence of VVR with a focus on vasovagal syncope
Sadaf Nabi Bhatti +3 more
doaj
Incidence of vasovagal syncope among blood donors – experiences from a Norwegian blood bank
Bioingeniøren, 2023 Background/ objective: Vasovagal reactions related to blood donation are often mild or moderate, but severe reactions such as syncope can occur. This study sought to investigate the incidence of syncope among blood donors in a Norwegian blood bank and to
Dorthe Charlotte Johannessen +3 more
doaj
Nordisk Tidsskrift for Helseforskning, 2015 Patients with mental disorders are often less active than the general population and inactivity over time reduces mental and physical health. We know from previous studies that physical activity contributes to improved mental and physical health, but it ...
Elfrid Margrete Aarseth +4 more
doaj +1 more source