Results 11 to 20 of about 3,568,047 (295)

Image findings of cranial nerve pathology on [18F]-2- deoxy-D-glucose (FDG) positron emission tomography with computerized tomography (PET/CT): a pictorial essay. [PDF]

open access: yes, 2015
This article aims to increase awareness about the utility of (18)F -FDG-PET/CT in the evaluation of cranial nerve (CN) pathology. We discuss the clinical implication of detecting perineural tumor spread, emphasize the primary and secondary (18)F -FDG-PET/
Muzaffar, Razi   +3 more
core   +1 more source

A minimum in the latitude variation of spread-F at March equinox

open access: yesProgress in Earth and Planetary Science, 2018
This short paper presents the statistics of spread-F occurrence at four low-mid latitude locations (17.0° N, 21.2° N, 26.5° N and 36.5° N mag. lat.) in Japan longitude sector (~ 135° E) in March to April 2002, 2003 and 2006 (high, medium and low solar ...
N. Balan   +3 more
doaj   +1 more source

Seasonal variations of equatorial spread-F [PDF]

open access: yesAnnales Geophysicae, 1994
The occurrence of spread-F at Trivandrum (8.5°N, 77°E, dip 0.5°N) has been investigated on a seasonal basis in sunspot maximum and minimum years in terms of the growth rate of irregularities by the generalized collisional Rayleigh-Taylor (GRT ...
K. S. V. Subbarao, B. V. Krishna Murthy
doaj   +1 more source

Spread F – an old equatorial aeronomy problem finally resolved? [PDF]

open access: yesAnnales Geophysicae, 2009
One of the oldest scientific topics in Equatorial Aeronomy is related to Spread-F. It includes all our efforts to understand the physical mechanisms responsible for the existence of ionospheric F-region irregularities, the spread of the traces in a ...
R. F. Woodman
doaj   +1 more source

Overview and summary of the Spread F Experiment (SpreadFEx) [PDF]

open access: yesAnnales Geophysicae, 2009
We provide here an overview of, and a summary of results arising from, an extensive experimental campaign (the Spread F Experiment, or SpreadFEx) performed from September to November 2005, with primary measurements in Brazil.
D. C. Fritts   +29 more
doaj   +1 more source

HF radar observations of equatorial spread-F over West Africa [PDF]

open access: yesAnnales Geophysicae, 1996
New experimental data depicting equatorial spread-F were taken during an HF radar sounding campaign in Korhogo (Ivory Coast, 9°24N, 5°37W, dip 4°S). Range-time-intensity maps of the radar echoes have been analyzed to identify the signatures of density
J.-F. Cécile, P. Vila, E. Blanc
doaj   +1 more source

Morphology of quantified ionospheric range spread-F over a wide range of midlatitudes in the Australian longitudinal sector [PDF]

open access: yesAnnales Geophysicae, 2007
Ionograms from a standard vertical-incidence ionosonde chain (nine stations), obtained over a wide range of southern latitudes (in geom.lat. range: 23°–52° S), were digitally scanned at 5-min intervals at nighttime (18:00–06:00 LT)
L. A. Hajkowicz
doaj   +1 more source

Pine Pitch Canker and Insects: Regional Risks, Environmental Regulation, and Practical Management Options [PDF]

open access: yes, 2019
Producción CientíficaPine pitch canker (PPC), caused by the pathogenic fungus Fusarium circinatum (Nirenberg and O’ Donnell), is a serious threat to pine forests globally.
Altunisik, Aliye   +22 more
core   +2 more sources

Statistical analysis of low-latitude spread F observed over Puer, China, during 2015–2016

open access: yesEarth, Planets and Space, 2019
Statistical analysis of spread F (SF), recorded at Puer (PUR, 22.7° N, 101.05° E, Dip Latitude 12.9° N) during 2015–2016, was carried out to reveal its characteristics at the northern equatorial ionization anomaly.
Ting Lan   +5 more
doaj   +1 more source

Travel distance, frequency of return, and the spread of disease

open access: yesScientific Reports, 2023
Human mobility is a key driver of infectious disease spread. Recent literature has uncovered a clear pattern underlying the complexity of human mobility in cities: $$r \cdot f$$ r · f , the product of distance traveled r and frequency of return f per ...
Cate Heine   +4 more
doaj   +1 more source

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