Search results for "Instruments"
showing 10 items of 237 documents
ESTREMO/WFXRT: Extreme phySics in the TRansient and Evolving COsmos
2006
We present a mission designed to address two main themes of the ESA Cosmic Vision Programme: the Evolution of the Universe and its Violent phenomena. ESTREMO/WFXRT is based on innovative instrumental and observational approaches, out of the mainstream of observatories of progressively increasing area, i.e.: Observing with fast reaction transient sources, like GRB, at their brightest levels, thus allowing high resolution spectroscopy. Observing and surveying through a X-ray telescope with a wide field of view and with high sensitivity extended sources, like cluster and Warm Hot Intragalactic Medium (WHIM). ESTREMO/WFXRT will rely on two cosmological probes: GRB and large scale X-ray structur…
A sample of weak blazars at milli-arcsecond resolution
2015
We started a follow-up investigation of the Deep X-ray Radio Blazar Survey objects with declination >-10 deg. We undertook a survey with the EVN at 5GHz to make the first images of a complete sample of weak blazars, aiming at a comparison between high- and low-power samples of blazars. All of the 87 sources observed were detected. Point-like sources are found in 39 cases, and 48 show core-jet structure. According to the spectral indices previously obtained, 58 sources show a flat spectral index, and 29 sources show a steep spectrum or a spectrum peaking at a frequency around 1-2 GHz. Adding to the DXRBS objects we observed those already observed with ATCA in the southern sky, we found th…
Position resolution of the prototype AGATA triple-cluster detector from an in-beam experiment
2009
AGATA belongs to a new generation of gamma-ray detector arrays for nuclear spectroscopy at present in its final stage of development. The detectors of these new arrays will be based on 36-fold electronically segmented coaxial germanium diodes operated in position sensitive mode. An in-beam test of the AGATA prototype triple cluster detector was carried out with the purpose of demonstrating the feasibility of such detectors and in order to measure the most sensitive parameters for their overall performance. An inverse kinematics reaction was performed, using a (48)Ti beam at an energy of 100MeV, impinging on a deuterated titanium tat-get. The results from the analysis of the experimental dat…
Measurement of W-pair production in $e^{+}e^{-}$ collisions at centre-of-mass energies from 183 to 209 GeV
2004
The W + W- production cross section is measured from a data sample corresponding to a total integrated luminosity of 683 pb-1, collected by the ALEPH experiment at LEP at centre-of-mass energies from 183 to 209 GeV. Individual cross sections for the different topologies arising from W decays into leptons or hadrons, as well as the total W-pair cross section are given at eight centre-of-mass energies. The results are found to be in agreement with recently developed Standard Model calculations at the one percent level. The hadronic branching fraction of the W boson is measured to be B(W→qq¯) = 67.13 ± 0.37(stat.) ± 0.15(syst.)%, from which the CKM matrix element |\ensuremathVcs| is determined…
Synchronized photonic modulators driven by surface acoustic waves
2013
Photonic modulators are one of the most important elements of integrated photonics. We have designed, fabricated, and characterized a tunable photonic modulator consisting of two 180 degrees-dephased output waveguide channels, driven by a surface acoustic wave in the GHz frequency range built on (Al,Ga)As. Odd multiples of the fundamental driven frequency are enabled by adjusting the applied acoustic power. A good agreement between theory and experimental results is achieved. The device can be used as a building block for more complex integrated functionalities and can be implemented in several material platforms. (C) 2013 Optical Society of America
El papel del péndulo en el construcción del paradigma newtoniano
1992
This paper shows the important role of one of the most common instruments, the pendulum, in the construction of the newtonian paradigm. From the analysis of some interesting applications carried out by the greatest scientists of that time, we conclude that the appropriate use of the pendulum in the classroom can be an easy way to introduce historical and epistemological evolution of basic physical concepts.
INTEGRAL/SPI ground calibration
2003
Three calibration campaigns of the spectrometer SPI have been performed before launch in order to determine the instrument characteristics, such as the effective detection area, the spectral resolution and the angular resolution. Absolute determination of the effective area has been obtained from simulations and measurements. At 1 MeV, the effective area is 65 cm^2 for a point source on the optical axis, the spectral resolution ~2.3 keV. The angular resolution is better than 2.5 deg and the source separation capability about 1 deg. Some temperature dependant parameters will require permanent in-flight calibration.
Principals instruments utilitzats en psicologia jurídica a través de l’estudi dels articles indexats en la web of science
2017
L’objectiu del present treball és conéixer els principals instruments utilitzats en la Psicologia Jurídica i els temes d’investigació més rellevants a través de l’anàlisi dels articles indexats en les bases de dades de la Web of Science durant i, en concret, de l’any 2014, i que han sigut publicats en revistes incloses en les categories temàtiques Criminology & Penology, Law and Psychology de les bases de dades JCR (SSCI) de l’any 2014. El nombre total d’articles revisats van ser 810. Els resultats revelen que els instruments més emprats són Conflict Tactics Scales, Psychopathy Checklisti Static Risk Matrix. Els trastorns més freqüents en les investigacions van ser el Trastorn per estrés po…
Instruments measuring fatalism: A systematic review.
2022
This systematic review aims to provide a comprehensive overview of the existing scales for fatalism, along with information regarding their methodological robustness. A systematic search was conducted in PsycINFO (PsycARTICLES and Psychology and Behavioral Sciences), PubMed, Scopus, MEDLINE, and Web of Science. Articles were selected if they described a Self-Report questionnaire properly designated for assessing fatalism (both original developments and further validations), if they included a measure in which fatalism is the core construct rather than a subscale of a multidimensional scale, and if they were published in peer-reviewed journals in the English language. The methodological qual…
A new off-line ion source facility at IGISOL
2019
An off-line ion source station has been commissioned at the IGISOL (Ion Guide Isotope Separator On-Line) facility. It offers the infrastructure needed to produce stable ion beams from three off-line ion sources in parallel with the radioactive ion beams produced from the IGISOL target chamber. This has resulted in improved feasibility for new experiments by offering reference ions for Penning-trap mass measurements, laser spectroscopy and atom trap experiments.