1,721,708 research outputs found
Resonant-mass detectors: status and perspectives
No full textWe review the main features and the perspectives of the resonant-mass gravitational wave detectors. Bar detectors have been taking data for the last few years with burst sensitivity h sime 4 × 10−19 at SNR = 1, or, in spectral units, 3 × 10−22 Hz −1/2 over a bandwidth of about 1 Hz, with a duty cycle mainly limited by cryogenic operations. In addition to the systematic search for impulsive events, the data collected are being used to detect periodic waves over long time periods, to give new upper limits for the stochastic background of cosmological origin, and to study possible correlation with gamma ray bursts. The recent developments of readout electronics have allowed us to increase the detection bandwidth to a few tens of Hz, and even larger bandwidths are expected in the near future. Resonant-mass detectors of spherical shape have been investigated and many different solutions have been proposed. Two small (about 60 cm in diameter) spheres are under construction in Holland and Brazil. Recently, a new scheme has been proposed, the 'dual' detector, which can provide a wideband performance. We briefly describe the status of traditional resonant-mass detectors and the main features and the state of the art of the advanced acoustic detectors
Developments in resonant-mass detectors
Full text linkAbstract After a brief summary of the state of the art of resonant-mass detectors, we will describe the planned developments of bar antennas and the near-term perspectives related to the development of SFERA, a new, 33 ton, spherical detector
Gravitational wave radiation from compact binary systems in the Jordan-Brans-Dicke theory
No full textIn this paper we analyze the signal emitted by a compact binary system in the Jordan-Brans-Dicke theory. We compute the scalar and tensor components of the power radiated by the source and study the scalar waveform. Eventually we consider the detectability of the scalar component of the radiation by interferometers and resonant-mass detectors
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
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