186,211 research outputs found
Cavazzani et Manca, Altérations de la sensibilité thermique et tactile à la suite d'une lésion du nerf radial
No full textAnonyme . Cavazzani et Manca, Altérations de la sensibilité thermique et tactile à la suite d'une lésion du nerf radial. In: L'année psychologique. 1895 vol. 2. p. 671
Alterazioni vestibolari in operai calzaturieri
No full textSono stati esaminati 78 lavoratori di un calzaturificio al fine di verificare se l'esposizione a modiche concentrazioni di solventi del gruppo degli idrocarburi alifatici causa alterazioni del sistema nervoso centrale. Il test di Veits e nei casi alterati, la registrazione elettronistagmografica, hanno messo in evidenza una maggiore e statisticamemte significativa frequenza di alterazioni della funzione vestibolare nei lavoratori calzaturieri rispetto ad un gruppo di controllo. Tali alterazioni erano inquadrabili nella "sindrome nucleo-reticolare tossica" che esprime lesioni delle strutture nervose a livello bulbare. Le modificazioni rilevate non erano correlate nè al tempo di esposizione ai solventi nè alla mansione lavorativa. I solventi usati nei calzaturifici, come altri solventi riportati in letteratura, causano alterazioni del sistema nervoso centrale anche se assorbiti in quantità non particolarmente rilevanti
Characterisation of the GABA autoreceptor in human neocortex as a pharmacological subtype of the GABAB receptor
No full textLaboratory Characterisation of a Commercial RGB CMOS Camera for Measuring Night Sky Brightness
No full textThe use of RGB cameras in photometric applications has grown over the last few decades in many fields such as industrial applications, light engineering and the analysis of the quality of the night sky. In this last field, they are often used in conjunction with a Sky Quality Meter (SQM), an instrument used for the measurement of night sky brightness (NSB), mainly when there is a significant amount of artificial light at night (ALAN). The performances of these two instruments are compared here. A simple source composed of nine narrowband LEDs in an integrating sphere was used to excite the two instruments and therefore measure the spectral responsivity of the SQM and of the three channels of the camera. The estimated uncertainties regarding spectral responsivity were less than 10%. A synthetic instrument approximating the SQM's responsivity can be created using a combination of the R, G and B channels. The outputs of the two instruments were compared by measuring the spectral radiance of the night sky. An evaluation of the spectral mismatch between the two instruments completed the analysis of their spectral sensitivity. Finally, the measurements of real SQMs in four sites experiencing different levels of light pollution were compared with the values obtained by processing the recorded RGB images. Overall, the analysis shows that the two instruments have significantly different levels of spectral responsivity, and the alignment of their outputs requires the use of a correction which depends on the spectral distribution of the light coming from the sky. A synthetic SQM will always underestimate real SQM measures; an average correction factor was evaluated considering nine sky spectra under low and medium levels of light pollution; this was determined to be 1.11 and, on average, compensated for the gap. A linear correction was also supposed based on the correlation between the NSB levels measured by the two instruments; the mean squared error after the correction was 0.03 mag arcsec-2
Instrument assessment and atmospheric phenomena in relation to the night sky brightness time series
No full textSeveral networks of Sky Quality Meters show long-term trends in measuring the night sky brightness. Causes of this variation could be ageing of the instruments and variations of the sky emission. The data from Ekar Observatory (Italy) are here considered. No significant ageing effect was detected on 9-year-old housing windows. A 9-year-old IR blocking filter shows a variation of its spectral transmittance up to 80%. No trend on the SQM output was found due to only the variation of the spectral distribution of the night sky emission. Together with ageing of the IR blocking filter, it causes a reduction of the SQM output of about 0.01 magSQM arcsec-2 per year. Slow trend of the aerosol optical depth suggests the air near the considered site is changing towards less polluted conditions. It reduces scattering of the artificial light and consequently sky glow in the light polluted considered site
Direct evidence that release-stimulating alpha7* nicotinic cholinergic receptors are localized on human and rat brain glutamatergic axon terminals
No full textCalibration of digital compact cameras for sky quality measures
No full textThis work presents the possibility of using the extremely popular compact digital cameras of smartphones or action cameras to perform sky photometry. The newest generation of these devices allows to save raw images. They are not as good as digital single-lens reflex camera, in particular in terms of sensitivity, noise and pixel depth (10 bit versus 12 bit or more), but they have the advantage of being extremely widespread on the population and relatively cheap. These economical digital compact cameras work with an electronic shutter, it overcomes the consumption of mechanics and allows to gather images for long time. The work uses a simple calibration method to transfer raw data from the proprietary RGB color space to the standard CIE 1931 color space. It allows the measurement of sky luminance in cd m−2 with an expected uncertainty of about 20%. Furthermore, the colorimetric calibration allows to know the correlated color temperature of a portion of the sky, it can help the identification of the kind of polluting sources. Aiming at better clarifying the performances of calibrated digital compact cameras, a comparison with a calibrated DSLR camera is presented in outdoor situations showing a good agreement both for luminance and color temperature measurements
5-hydroxytryptamine3 receptors sited on cholinergic axon terminals of human cerebral cortex mediate inhibition of acetylcholine release
No full textSelective block of rat and human neocortex GABA-B receptors regulating somatostatin release by a GABAB antagonist endowed with cognition enhancing activity
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