Challenges in Signal Analysis of Resonant-Mass Gravitational Wave Detectors

An overview of the main points related to data analysis in resonant-mass gravitational wave detectors will be presented. Recent developments on the data analysis system for the Brazilian detector SCHENBERG will be emphasized.Comment: 6 pages, 3 figures, presented at the international conference "100 Years of Relativity" (Sao Paulo, Brazil, 22-24 August 2005), to appear in Brazilian Journal of Physics (Dec. 2005

A Model for the Braking Indices of Pulsars

Stars known as pulsars are generally modeled as magnetized spheres made of neutrons with high rotation frequency. It is known that such stars are spinning down and this braking is measured by a parameter, n, known as braking index. For the canonical model such parameter should have a single value for all pulsars: n = 3. However, from observations it is known that n diverges from 3. In this work, differently from the canonical model, we have hypothesized the existence of a variation of the moment of inertia of the star through a time-varying radius. Using energy conservation we find the values for the variation of the radius of our pulsar sample. Our results indicate that it may be reasonable to consider that the radius of pulsars can be changing with time.Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)National Institute of Science and Technology in Astrophysics (INCT-A, Brazil)National Institute of Science and Technology in Astrophysics (a joint CNPq project, FAPESP )National Institute of Science and Technology in Astrophysics (a joint FAPESP project, FAPESP)FAPESPITA, Dept Fis, Praca Marechal Eduardo Gomes 50, BR-12228900 Sao Jose Dos Campos, SP, BrazilUniv Fed Sao Paulo UNIFESP, Dept Fis, Rua Sao Nicolau 210, BR-09913030 Diadema, SP, BrazilUniv Fed Sao Paulo UNIFESP, Dept Fis, Rua Sao Nicolau 210, BR-09913030 Diadema, SP, BrazilINCT-A a joint CNPq project, FAPESP: 2008/57807-5National Institute of Science and Technology in Astrophysics a joint FAPESP project, FAPESP: 2008/57807-5FAPESP: 2013/26258-4Web of Scienc

The Schenberg spherical gravitational wave detector: the first commissioning runs

Here we present a status report of the first spherical antenna project equipped with a set of parametric transducers for gravitational detection. The Mario Schenberg, as it is called, started its commissioning phase at the Physics Institute of the University of Sao Paulo, in September 2006, under the full support of FAPESP. We have been testing the three preliminary parametric transducer systems in order to prepare the detector for the next cryogenic run, when it will be calibrated. We are also developing sapphire oscillators that will replace the current ones thereby providing better performance. We also plan to install eight transducers in the near future, six of which are of the two-mode type and arranged according to the truncated icosahedron configuration. The other two, which will be placed close to the sphere equator, will be mechanically non-resonant. In doing so, we want to verify that if the Schenberg antenna can become a wideband gravitational wave detector through the use of an ultra-high sensitivity non-resonant transducer constructed using the recent achievements of nanotechnology

Effect of Intraoperative High Positive End-Expiratory Pressure (PEEP) With Recruitment Maneuvers vs Low PEEP on Postoperative Pulmonary Complications in Obese Patients: A Randomized Clinical Trial (vol 321, pg 2292, 2019)

status: publishe