1,721,036 research outputs found
Implementing a simple vectorial bridge with a digital oscilloscope
No full textWe show how to exploit instrumentation available in undergraduate student laboratories to build a
simple vectorial bridge. In particular, we take advantage of the ability to read data from a digital oscilloscope with a personal computer and describe an algorithm to obtain an accurate evaluation
of the phase difference etween two sinusoidal signals. The use of the bridge to characterize
components of a high-Q RLC filter is shown to greatly improve the understanding of results in electrical resonance experiments. Direct evidence of dielectric losses, skin currents, and the effect of distributed capacitance is obtaine
The Proceedings of the Third Roma International Conference on Astroparticle Physics (RICAP'11) Preface
No full text
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Gamma ray astronomy with ARGO-YBJ: First observations.
No full textThe ARGO-YBJ experiment is the first EAS detector combining a very high mountain altitude (4300 m a.s.l.) to a full coverage detection surface. These features allow ARGO-YBJ to work in the typical energy range of Cherenkov telescopes, with an energy threshold of a few hun- dreds GeV. The low threshold and the large field of view (<2 sr) make ARGO-YBJ suitable to monitor the gamma ray sky, searching for un- known sources and unexpected events, like Active Galactic Nuclei flaring episodes or high energy Gamma Ray Bursts. In this paper we present the preliminary results on Gamma Ray Astron- omy obtained with the events collected in the first months of data taking, in particular the detection of gamma rays from the Crab Nebula, the ob- servation of a Markarian 421 outburst in July-August 2006, and finally a search for Gamma Ray Bursts emission in the GeV energy range using the scaler mode technique
- …
