229 research outputs found
Clinical Research Office of the Endourological Society : the highest quality in global data collection
How to use magnetic field information for coronal loop identification?
The structure of the solar corona is dominated by the magnetic field because
the magnetic pressure is about four orders of magnitude higher than the plasma
pressure. Due to the high conductivity the emitting coronal plasma (visible
e.g. in SOHO/EIT) outlines the magnetic field lines. The gradient of the
emitting plasma structures is significantly lower parallel to the magnetic
field lines than in the perpendicular direction. Consequently information
regarding the coronal magnetic field can be used for the interpretation of
coronal plasma structures. We extrapolate the coronal magnetic field from
photospheric magnetic field measurements into the corona. The extrapolation
method depends on assumptions regarding coronal currents, e.g. potential fields
(current free) or force-free fields (current parallel to magnetic field). As a
next step we project the reconstructed 3D magnetic field lines on an EIT-image
and compare with the emitting plasma structures. Coronal loops are identified
as closed magnetic field lines with a high emissivity in EIT and a small
gradient of the emissivity along the magnetic field.Comment: 14 pages, 3 figure
How do stone attenuation and skin-to-stone distance in computed tomography influence the performance of shock wave lithotripsy in ureteral stone disease?
Finding the best proxies for the solar UV irradiance
Solar UV emission has a profound impact on the upper terrestrial atmosphere.
Because of instrumental constraints, however, solar proxies often need to be
used as substitutes for the solar spectral variability. Finding proxies that
properly reproduce specific spectral bands or lines is an ongoing problem.
Using daily observations from 2003 to 2008 and a multiscale statistical
approach, we test the performances of 9 proxies for the UV solar flux. Their
relevance is evaluated at different time-scales and a novel representation
allows all quantities to be compared simultaneously. This representation
reveals which proxies are most appropriate for different spectral bands and for
different time scales.Comment: to appear in Geoph. Res. Let
Junkie love : romance and addiction on the big screen
This article investigates the filmic construction of two disparate but intertwining cultural practices: those engaging in the life-affirming rituals of romantic love and those performing the potentially self-destructive rituals of hard drug consumption. Discussing a number of key feature films from the (mini) genre “junkie love”, it aims to show what happens when elements of mainstream romantic drama merge with the horror conventions of the heroin addiction film. Drawing amongst others on Murray Smith’s theory of “levels of [spectator] engagement” and Greg Smith’s concept of the “emotion system”, the article concludes that junkie love films, using tropes of the romantic tragedy in the tradition of Romeo and Juliet, present a more complex and nuanced approach to drug addicts than the predominantly condemnatory media coverage—one that arguably invites the spectator’s understanding and compassion
Experiences of handwriting and using a computerized ATD in school: Adolescents with Asperger's syndrome
Outcomes of intracorporeal lithotripsy of upper tract stones is not affected by BMI and skin-to-stone distance (SSD) in obese and morbid patients
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