A5011895804- Pulsars and Gravitational Waves Research
- Physics of Superconductivity and Magnetism
- Cosmology and Gravitation Theories
- Geophysics and Sensor Technology
- Geophysics and Gravity Measurements
- Cold Atom Physics and Bose-Einstein Condensates
- Superconducting and THz Device Technology
- Hemoglobin structure and function
- Quantum, superfluid, helium dynamics
- Advanced Frequency and Time Standards
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Mechanical and Optical Resonators
- Theoretical and Computational Physics
- Gamma-ray bursts and supernovae
- Magnetic properties of thin films
- Neonatal Health and Biochemistry
- Relativity and Gravitational Theory
- Quantum and electron transport phenomena
- Advanced Thermodynamics and Statistical Mechanics
- Protein Structure and Dynamics
- Magnetic Properties and Applications
- Dark Matter and Cosmic Phenomena
- Seismic Waves and Analysis
- Particle accelerators and beam dynamics
Istituto Nazionale di Fisica Nucleare, Sezione di Padova
2007-2021
Istituto Nazionale di Fisica Nucleare
1989-2020
University of Padua
2002-2019
European Space Research and Technology Centre
2009
Centre National de la Recherche Scientifique
2008
University of Trento
1989-2008
European Gravitational Observatory
2008
Laboratoire d’Annecy de Physique des Particules
2008
Institut National de Physique Nucléaire et de Physique des Particules
2008
Fondazione Bruno Kessler
2008
The last century has seen enormous progress in our understanding of the Universe. We know life cycles stars, structure galaxies, remnants big bang, and have a general how Universe evolved. come remarkably far using electromagnetic radiation as tool for observing However, gravity is engine behind many processes Universe, much its action dark. Opening gravitational window on will let us go further than any alternative. Gravity own messenger: Gravitational waves, ripples fabric spacetime. They...
We propose an under-ground experiment to detect the general relativistic effects due curvature of space-time around Earth (de Sitter effect) and rotation planet (dragging inertial frames or Lense-Thirring effect). It is based on comparison between IERS value vector corresponding measurements obtained by a tri-axial laser detector rotation. The proposed consists six large ring-lasers arranged along three orthogonal axes. In about two years data taking, 1% sensitivity required for measurement...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of quaternary structure the globin on thermal spin equilibria in different methemoglobin derivativesCalogero Messana, Massimo Cerdonio, Peter Shenkin, Robert W. Noble, Giulio Fermi, Robin N. Perutz, and Max F. PerutzCite this: Biochemistry 1978, 17, 3652–3662Publication Date (Print):August 22, 1978Publication History Published online1 May 2002Published inissue 22 August...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSusceptibility studies of laccase and oxyhemocyanin using an ultrasensitive magnetometer. Antiferromagnetic behavior the type 3 copper in Rhus laccaseEdward I. Solomon, David M. Dooley, Run-Han Wang, Harry B. Gray, Cerdonio, F. Mogno, G. L. RomaniCite this: J. Am. Chem. Soc. 1976, 98, 4, 1029–1031Publication Date (Print):February 1, 1976Publication History Published online1 May 2002Published inissue 1 February...
When the magnetic susceptibility of frozen aqueous solutions human oxyhemoglobin was measured in range between 25 and 250 K, it showed a temperature-dependent behavior typical thermal equilibrium ground singlet state an excited triplet for two electrons per heme, energy separation being [2J] = 146 cm-1. By contrast, within same temperature range, carboxyhemoglobin found to be diamagnetic, as already reported.
A search for a new scalar field, called moduli, has been performed using the cryogenic resonant-mass AURIGA detector. Predicted by string theory, moduli may provide significant contribution to dark matter (DM) component of our Universe. If this is case, interaction ordinary with local DM forming Galaxy halo, will cause an oscillation solid bodies frequency corresponding mass moduli. In sensitive band AURIGA, some 100 Hz at around 1 kHz, expected signal, Q=△f/f∼10^{6}, narrow peak, △f∼1 mHz....
The displacement fluctuations of mirrors in optomechanical devices, induced via thermal expansion by temperature due either to thermodynamic or the photon absorption, can be made smaller than quantum fluctuations, at low temperatures, high reflectivities, and light powers needed readout displacements standard limit. result is relevant for design quantum-limited gravitational-wave detectors, both ``interferometers'' ``bars,'' experiments study directly mechanical motion regime.
This paper presents the results of observations detectors participating in International Gravitational Event Collaboration (IGEC) from 1997 to 2000 and reviews data analysis methods. The is designed search for coincident excitations multiple detectors. set analyzed this article covers a longer period more complete than that given previous reports. current accurate determining false dismissal probability time coincidence it optimizes with respect target amplitude direction signal. statistics...
We report the initial results from a search for bursts of gravitational radiation by network five cryogenic resonant detectors during 1997 and 1998. This is first significant with more than two observing simultaneously. No wave burst was detected. The false alarm rate lower 1 per 10(4) yr when three or were operating typical threshold H approximately 4x10(-21) Hz-1 on Fourier component at 10(3) Hz strain amplitude. New upper limits amplitude have been set.
We present the concept of a sensitive and broadband resonant mass gravitational wave detector. A massive sphere is suspended inside second hollow one. Short, high-finesse Fabry-Perot optical cavities read out differential displacements two spheres as their quadrupole modes are excited. At cryogenic temperatures, one approaches standard quantum limit for operation with reasonable choices cavity finesses intracavity light power. molybdenum detector, overall size 2 m, would reach spectral...
The first run of the ultracryogenic resonant bar detector AURIGA is in progress. Diagnostics on cryogenics, data acquisition system and noise characteristics have been performed, with results accord design. reached 140 mK. In tests down to 2 K was very close `Brownian'.
We apply a feedback cooling technique to simultaneously cool the three electromechanical normal modes of ton-scale resonant-bar gravitational wave detector AURIGA. The measuring system is based on dc superconducting quantum interference device (SQUID) amplifier, and applied electronically input circuit SQUID. Starting from bath temperature 4.2 K, we achieve minimum 0.17 mK for coolest mode. same technique, implemented in dedicated experiment at subkelvin with limited SQUID, could allow...
We analyze heat and work fluctuations in the gravitational wave detector AURIGA, modeled as a macroscopic electromechanical oscillator contact with thermostat cooled by an active feedback system. The is driven to steady state cooling, equivalent viscous force. experimentally measured are agreement our theoretical analysis based on stochastically Langevin asymmetry of absorbed characterizes oscillator's nonequilibrium reveals extent which system departs from equilibrium statistical mechanics...
The magnetic susceptibility and the density of human oxy-(HbO 2 ) carbonmonoxyhemoglobin (HbCO) solutions various concentrations have been measured at room temperature, with pure water used as a calibrant. Solutions unstripped stripped HbO pH 7.2 in unbuffered solvent were always found to be less diamagnetic than water, whereas HbCO identical conditions more water. After correcting for concentration-dependent changes assuming samples fully diamagnetic, paramagnetic reduction corresponds...
We have implemented a novel scheme of signal readout for resonant gravitational wave detectors. For the first time, capacitive transducer has been matched to amplifier by means tuned high $Q$ electrical resonator. The resulting 3-mode detection widens significantly bandwidth detector. present here results achieved this equipped with two-stage SQUID amplifier. Once installed on AURIGA detector, one-sided spectral sensitivity obtained detector operated at 4.5 K is better than...
The network of resonant bar detectors gravitational waves resumed coordinated observations within the International Gravitational Event Collaboration (IGEC-2). Four are taking part in this Collaboration: ALLEGRO, AURIGA, EXPLORER and NAUTILUS. We present here results search for wave bursts over 6 months during 2005, when IGEC-2 was only observatory operation. implemented data analysis is based on a time coincidence among NAUTILUS; ALLEGRO reserved follow-up studies. amplitude sensitivity to...
A susceptometer, based on various properties of superconductors, has been developed. It makes possible the resolution differences in magnetic susceptibility less than 1% diamagnetism water, whole temperature interval between liquid helium and room temperature, sample volumes about 0.1 cm3. Two prototypes are presently routine operation for measurements solutions, suspensions, powders, crystals.
A new method has been developed for making sensitive differential measurements of ion mobilities in liquid helium. Using this method, it possible to make a definitive test the part Huang-Olinto theory intended explain discontinuities superfluid The found be incorrect.
We study the sensitivity limits of a broadband gravitational-waves detector based on dual resonators such as nested spheres. determine both thermal and back-action noises when displacements are read-out with an optomechanical sensor. analyze contributions all mechanical modes, using new method to deal force-displacement transfer functions in intermediate frequency domain between two sensitive modes associated each resonator. This gives accurate estimate response, together evaluation error....
At the time when giant flare of SGR1806-20 occurred, AURIGA "bar" gravitational-wave (GW) detector was on air with a noise performance close to stationary Gaussian. This allows us set relevant upper limits, at number frequencies in vicinities 900 Hz, amplitude damped GW wave trains, which, according current models, could have been emitted, due excitation normal modes star associated peak x-ray luminosity.
We describe the experimental efforts to set up second AURIGA run. Thanks upgraded capacitive readout, fully characterized and optimized in a dedicated facility, we predict an improvement detector sensitivity bandwidth by at least one order of magnitude. In run, will also benefit from newly designed cryogenic mechanical suspensions data acquisition analysis.
Experiments have been carried out in an attempt to confirm previous reports of paramagnetism the oxy- and carbonmonoxy derivatives human carp hemoglobin. When care is taken ensure complete saturation hemoglobins with ligand diamagnetic contributions all buffers are carefully evaluated, these hemoglobin found same gram susceptibilities as exhibited by a set metal free proteins, suggesting that they fully diamagnetic.