The manufacturing technology of a highly sensitive detector, 50 mm in diameter, with a 100-120 microm thick sensitive region based on alpha-Si-p-i-n structures is described. Lithium diffusion was ...conducted in order to create a p-n junction on p-silicon. After lithium has drifted through the entire thickness the diffusion layer is removed, so that the thickness of the 'dead' layer of the output window decreased. The advantages of the developed detector are low operating voltage and relatively low energy losses in the input and output windows ~6-12 keV and ~12-20 keV, respectively, which ensures that the volume activity of alpha particles is measured in the 2pi geometry. The energy resolution of the 7.65 MeV sup.226Ra alpha-particles is less than 90 keV. The measured concentration of soil-air radon is given. The change in radon concentration, temperature, and humidity over time is shown. The measurements were performed in real time.
Plane waves generated and alternated using a Digital Micromirror Device (DMD) were evaluated for modulating the spatial coherence of a laser beam. The spatial coherence and its modulation can be ...represented as a sampling problem in the temporal domain. In this way, the integration time in the detector, the frame rate of the DMD, and the laser coherence time were properly adjusted or chosen to achieve the effect of a beam with a particular state of spatial coherence. Two methods were applied to superpose the plane waves and produce controlled visibility variations in the interferogram of a Young's experiment. The visibility measurements show the variation of the modulus of the complex degree of spatial coherence, controlled by simple phase modulation, and between a pair of points on the wavefront. This procedure, which uses no mobile parts, could be applied in digital holography denoising, beam shaping, optical communications and optical metrology and imaging.
Plane waves generated and alternated using a Digital Micromirror Device (DMD) were evaluated for modulating the spatial coherence of a laser beam. The spatial coherence and its modulation can be ...represented as a sampling problem in the temporal domain. In this way, the integration time in the detector, the frame rate of the DMD, and the laser coherence time were properly adjusted or chosen to achieve the effect of a beam with a particular state of spatial coherence. Two methods were applied to superpose the plane waves and produce controlled visibility variations in the interferogram of a Young's experiment. The visibility measurements show the variation of the modulus of the complex degree of spatial coherence, controlled by simple phase modulation, and between a pair of points on the wavefront. This procedure, which uses no mobile parts, could be applied in digital holography denoising, beam shaping, optical communications and optical metrology and imaging. RESUMEN: Se utilizo un dispositivo digital de microespejos (DMD) para generary alternar ondas planas. Estas ondas planas se evaluaron para modular la coherencia espacial de un haz de luz laser. La coherecia espacial y su modulacion pueden ser entendidas como un problema de muestreo en el dominio temporal. De esta forma, el tiempo de integracion en el detector, el tiempo de refrescamiento de cuadros en el DMD y el tiempo de coherencia del laser, fueron aprovechados para lograr el efecto de un haz de luz con estado de coherencia espacial especffico. Se aplicaron dos metodos en la superposicion de las ondas planas para producir variaciones controladas en la visibilidad de interferogramas obtenidos en un experimento de Young. Las mediciones de visibilidad mostraron la variacion del modulo del grado complejo de coherencia, a traves de modulacion de fase, y entre un par de punto en el frente de onda. Este procedimiento, que no utiliza partes moviles, puede ser aplicado en reduccion de ruido en holograffa digital, conformacion de haces de luz, telecomunicaciones opticas y metrologfa.
Conflict detection is a phenomenon in which an individual detects when there is a difference between an intuitive and a logical response. Few studies have investigated the underlying factors that ...contribute to conflict detection. Possible factors include a preference and an ability to use numerical information during a judgment task. In the present study, participants estimated subjective probabilities, and completed the Subjective Numeracy Scale and the Fuzzy Processing Preference Index which assess numerical ability and preference for using numerical information respectively. We found no differences between detectors and non-detectors in terms of numeracy or processing preference, suggesting that conflict detection is not influenced by either an ability or tendency to use and understand numerical information.
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