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Prototype of a pulsed modulator for a future 20-MeV, 2-kA linear induction accelerator power supply is developed. It is capable of generating three pulses of flattop duration up to 350 ns at peak voltage 23 kV and current up to 10 kA with the variable delay between pulses from 2 to 100 μβ. TPI-type pseudospark switches with fast reverse recovery have been used that helped to simplify modulator schematics...
The third generation light source NSLS-II was constructed at BNL, within the project a Booster ring commissioning was successfully completed [1]. Booster injection and extraction kicker magnets pulsed power supplies are considered in the paper. The injection pulsed supplies are capable of generating 0.7–1.5 kA current of 300 ns flat-top, 170 ns rise time, 170 ns fall time with ripples on the tail...
A 2-MeV, 2-kA Linear Induction Accelerator LIA-2 was built and is in routine operation [1, 2]. Accelerator's high voltage system consists of 48 pulsed modulators, each of them supplies a couple of accelerating gaps with two pulses of 200 ns duration at peak voltage of 21 kV and variable delay between pulses from 2 to 100 μs. Pulse forming networks with combined dielectric and TPI-type pseudospark...
In this paper, automated medical data analysis and visualisation are discussed. The task of the VAST 2010 Mini Challenge 2 was to characterize the spread of an epidemic outbreak. The analysis should take into consideration symptoms, mortality rates and temporal patterns of the disease. Finally, the outbreak should be compared across different locations searching for anomalies. For the preprocessing...
Tourists face a great challenge when they gather information about places they want to visit. Geographically tagged information in the form of Wikipedia pages, local tourist information pages, dedicated web sites and the massive amount of information provided by Google Earth is publicly available and commonly used. But the processing of this information involves a time consuming activity. Our goal...
In the VAST Challenge 2009 suspicious behavior had to be detected applying visual analytics to heterogeneous data, such as network traffic, social network enriched with geo-spatial attributes, and finally video surveillance data. This paper describes some of the awarded parts from our solution entry.
Space- and time-referenced data published on the Web by general people can be viewed in a dual way: as independent spatio-temporal events and as trajectories of people in the geographical space. These two views suppose different approaches to the analysis, which can yield different kinds of valuable knowledge about places and about people. We define possible types of analysis tasks related to the...
Spatiotemporal analysis of sensor logs is a challenging research field due to three facts: a) traditional two-dimensional maps do not support multiple events to occur at the same spatial location, b) three-dimensional solutions introduce ambiguity and are hard to navigate, and c) map distortions to solve the overlap problem are unfamiliar to most users. This paper introduces a novel approach to represent...
Thanks to the Web-related and other advanced technologies, textual information is increasingly being stored in digital form and posted online. Automatic methods to analyze such textual information are becoming inevitable. Many of those methods are based on quantitative text features. Analysts face the challenge to choose the most appropriate features for their tasks. This requires effective approaches...
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