63,284 research outputs found
Confronto tra rumori di diversa natura in termini di influenza sulla performance umana tramite misure prestazionali e monitoraggio del battito cardiaco
No full textBridging RF-Voltage to coaxial power standard in the 100 MHz range
No full textElectromagnetic power standard realized by means of
the microcalorimetric technique fails below some
MHz because of a reduced sensitivity of the system.
This causes a metrological lack in the calibration of
coaxial
power
sensors
whose
broadband
characteristics span from dc up to 50 GHz. However,
as coaxial transmission lines admit pseudo potential
functions, power meter calibration can be done in
term of radio frequency (RF) voltage from dc up to
100 MHz at least. The paper describes how INRIM
works around the drawback of the microcalorimeter at
low frequencies
Family History and the Risk of Breast and Gastric Cancer
No full textEpidemiologists have used family history, usually of first degree relatives, as a marker for genetic risk, knowing that family history reflects the consequences of genetic susceptibilities, shared environment, and common behaviors. The role of family history on breast and gastric cancer risk has been evaluated in multiple studies. As for breast cancer, informative valid,and precise estimates of the role of family history derive from a reanalysis of individual data from 52 epidemiologicstudies including over 58,000 women with breast cancer and 100,000 controls, which estimated an approximately two fold increased risk for women with family history; the risk increased with the number of affected relatives, decreased with age and was greater the younger the relatives were when their breast cancer was diagnosed. As for gastric cancer, a meta-analysis published in 2018 and based on 36 case-control and 4 cohort studies found a significant pooled relative risk of about 2; in line with that, a subsequent analysis based on individ-ual participant data from 17 studies participating in the Stomach cancer Pooling (StoP) Project foundan 80% increased risk in subject with at least on first-degree relative affected by gastriccancer
Effects of azimuth-symmetric acceptance cutoffs on the measured asymmetry in unpolarized Drell-Yan fixed-target experiments
No full textStima simulata degli effetti di tagli di accettanza sperimentale con simmetria azimutale, nel creare false asimmetrie azimutali nei dati in esperimenti di tipo Drell-Ya
A 2 h periodic variation in the low-mass X-ray binary Ser X-1
No full textSpectroscopy of the low-mass X-ray binary Ser X-1 using the Gran Telescopio Canarias have revealed a ?2 h periodic variability that is present in the three strongest emission lines. We tentatively interpret this variability as due to orbital motion, making it the first indication of the orbital period of Ser X-1. Together with the fact that the emission lines are remarkably narrow, but still resolved, we show that a main-sequence K dwarf together with a canonical 1.4 M? neutron star gives a good description of the system. In this scenario, the most likely place for the emission lines to arise is the accretion disc, instead of a localized region in the binary (such as the irradiated surface or the stream-impact point), and their narrowness is due instead to the low inclination (?10°) of Ser X-1
Stable voters in an unstable party environment : continuity and change in Italian electoral behaviour
No full textM.24981-1999 Paolo Segatti, Paolo Bellucci and Marco Maraffi. 30 cm. A previous version of this paper was presented at a symposium on Political Parties : Changing Roles in Contemporary Democracies, held at the Center for Advanced Study in the Social Sciences of the Juan March Institute, Madrid, December 15-17, 1994. -- P.1. Includes bibliographical references (p. 56-59
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