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Piacentini F. - One of the best experts on this subject based on the ideXlab platform.

  • The short wavelength instrument for the polarization explorer balloon-borne experiment: Polarization modulation issues
    'Wiley', 2019
    Co-Authors: Columbro F., Battistelli E. S., Coppolecchia A., D'alessandro G., De Bernardis P., Lamagna L., Masi S., Pagano L., Paiella A., Piacentini F.
    Abstract:

    In this paper we investigate the impact of using a polarization modulator in The Short Wavelength Instrument for the Polarization Explorer (SWIPE) of the large scale polarization explorer (LSPE). The experiment is optimized to measure the linear polarization of the cosmic microwave background at large angular scales during a circumpolar long-duration stratospheric balloon mission, and uses multimode bolometers cooled to.3 K. The 330 detectors cover three bands at 140, 220, and 240 GHz. Polarimetry is achieved by means of a large rotating half-wave plate (HWP) and a single wire-grid polarizer in front of the arrays. The polarization modulator is the first polarization-active component of the optical chain, reducing significantly the effect of instrumental polarization. A Trade-off Study comparing stepped versus spinning HWPs drives the choice towards the second. Modulating the cosmic microwave background polarization signal at four times the spin frequency moves it away from 1/f noise from the detectors and the residual atmosphere. The HWP is cooled to 1.6 K to reduce the background on the detectors. Furthermore, its polarized emission combined with the emission of the polarizer produces spurious signals modulated at 2f and 4f. The 4f component is synchronous with the signal of interest and has to characterized to be removed from cosmological data

  • The short wavelength instrument for the polarization explorer balloon-borne experiment: Polarization modulation issues
    'Wiley', 2019
    Co-Authors: Columbro F., Battistelli E. S., Coppolecchia A., D'alessandro G., De Bernardis P., Lamagna L., Masi S., Pagano L., Paiella A., Piacentini F.
    Abstract:

    In this paper we investigate the impact of using a polarization modulator in the Short Wavelenght Instrument for the Polarization Explorer (SWIPE) of the Large Scale Polarization Explorer (LSPE). The experiment is optimized to measure the linear polarization of the Cosmic Microwave Background at large angular scales during a circumpolar long-duration stratospheric balloon mission, and uses multi-mode bolometers cooled at 0.3 K. The 330 detectors cover 3 bands at 140 GHz, 220 GHz and 240 GHz. Polarimetry is achieved by means of a large rotating half-wave plate (HWP) and a single wire-grid polarizer in front of the arrays. The polarization modulator is the first polarization-active component of the optical chain, reducing significantly the effect of instrumental polarization. A Trade-off Study comparing stepped vs spinning HWPs drives the choice towards the second. Modulating the CMB polarization signal at 4 times the spin frequency moves it away from $1/f$ noise from the detectors and the residual atmosphere. The HWP is cooled at 1.6 K to reduce the background on the detectors. Furthermore its polarized emission combined with the emission of the polarizer produces spurious signals modulated at $2f$ and $4f$. The $4f$ component is synchronous with the signal of interest and has to characterized to be removed from cosmological data.Comment: Proceeding of IWARA 201

Columbro F. - One of the best experts on this subject based on the ideXlab platform.

  • The short wavelength instrument for the polarization explorer balloon-borne experiment: Polarization modulation issues
    'Wiley', 2019
    Co-Authors: Columbro F., Battistelli E. S., Coppolecchia A., D'alessandro G., De Bernardis P., Lamagna L., Masi S., Pagano L., Paiella A., Piacentini F.
    Abstract:

    In this paper we investigate the impact of using a polarization modulator in The Short Wavelength Instrument for the Polarization Explorer (SWIPE) of the large scale polarization explorer (LSPE). The experiment is optimized to measure the linear polarization of the cosmic microwave background at large angular scales during a circumpolar long-duration stratospheric balloon mission, and uses multimode bolometers cooled to.3 K. The 330 detectors cover three bands at 140, 220, and 240 GHz. Polarimetry is achieved by means of a large rotating half-wave plate (HWP) and a single wire-grid polarizer in front of the arrays. The polarization modulator is the first polarization-active component of the optical chain, reducing significantly the effect of instrumental polarization. A Trade-off Study comparing stepped versus spinning HWPs drives the choice towards the second. Modulating the cosmic microwave background polarization signal at four times the spin frequency moves it away from 1/f noise from the detectors and the residual atmosphere. The HWP is cooled to 1.6 K to reduce the background on the detectors. Furthermore, its polarized emission combined with the emission of the polarizer produces spurious signals modulated at 2f and 4f. The 4f component is synchronous with the signal of interest and has to characterized to be removed from cosmological data

  • The short wavelength instrument for the polarization explorer balloon-borne experiment: Polarization modulation issues
    'Wiley', 2019
    Co-Authors: Columbro F., Battistelli E. S., Coppolecchia A., D'alessandro G., De Bernardis P., Lamagna L., Masi S., Pagano L., Paiella A., Piacentini F.
    Abstract:

    In this paper we investigate the impact of using a polarization modulator in the Short Wavelenght Instrument for the Polarization Explorer (SWIPE) of the Large Scale Polarization Explorer (LSPE). The experiment is optimized to measure the linear polarization of the Cosmic Microwave Background at large angular scales during a circumpolar long-duration stratospheric balloon mission, and uses multi-mode bolometers cooled at 0.3 K. The 330 detectors cover 3 bands at 140 GHz, 220 GHz and 240 GHz. Polarimetry is achieved by means of a large rotating half-wave plate (HWP) and a single wire-grid polarizer in front of the arrays. The polarization modulator is the first polarization-active component of the optical chain, reducing significantly the effect of instrumental polarization. A Trade-off Study comparing stepped vs spinning HWPs drives the choice towards the second. Modulating the CMB polarization signal at 4 times the spin frequency moves it away from $1/f$ noise from the detectors and the residual atmosphere. The HWP is cooled at 1.6 K to reduce the background on the detectors. Furthermore its polarized emission combined with the emission of the polarizer produces spurious signals modulated at $2f$ and $4f$. The $4f$ component is synchronous with the signal of interest and has to characterized to be removed from cosmological data.Comment: Proceeding of IWARA 201

Robert Lindeman - One of the best experts on this subject based on the ideXlab platform.

  • quality of life related to oral versus subcutaneous iron chelation a time trade off Study
    Value in Health, 2007
    Co-Authors: Richard H Osborne, Richard De Abreu Lourenco, Andrew Dalton, Jennifer Houltram, David Dowton, Douglas E Joshua, Robert Lindeman
    Abstract:

    Abstract Objective To investigate the utility associated with subcutaneous infusion (deferoxamine) compared with once-daily oral administration (deferasirox) of iron chelation therapy. Methods Interviews using the time Trade-off technique were used to estimate preferences (utility) for health states by finding the point at which respondents were indifferent between a longer but lower quality of life (QoL) and a shorter time in full health. Participants (n = 110) were community-based, 51% women, median age 35 years, from four regions in Sydney, Australia. Respondents rated three health states involving equal outcomes for people with thalassemia but with different treatment modalities for iron chelation; an "anchor state" describing a patient receiving iron chelation without administration mode specified, anchor state plus iron chelation via subcutaneous infusion, and anchor state plus iron chelation through once-daily oral medication. Results On an interval scale between 0 (death) and 1 (full health), median (interquartile range) utility of 0.80 (0.65–0.95) for the anchor state, 0.66 (0.45–0.87) for subcutaneous infusion, and 0.93 (0.80–0.97) for once-daily oral administration was obtained. The mean (median) difference of 0.23 (0.27) between the two treatments was statistically significant (Wilcoxon-signed rank test, P P P Conclusion Community respondents associate oral administration of an iron chelator such as deferasirox with enhanced QoL compared with subcutaneous treatment. Assuming equal safety and efficacy, QoL gains from once-daily oral treatment compared with subcutaneous infusion are significant.

Brian M. Sadler - One of the best experts on this subject based on the ideXlab platform.

  • path loss modeling and performance trade off Study for short range non line of sight ultraviolet communications
    Optics Express, 2009
    Co-Authors: Gang Chen, Haipeng Ding, Zhengyuan Xu, Brian M. Sadler
    Abstract:

    We consider outdoor non-line-of-sight deep ultraviolet (UV) solar blind communications at ranges up to 100 m, with different transmitter and receiver geometries. We propose an empirical channel path loss model, and fit the model based on extensive measurements. We observe range-dependent power decay with a power exponent that varies from 0.4 to 2.4 with varying geometry. We compare with the single scattering model, and show that the single scattering assumption leads to a model that is not accurate for small apex angles. Our model is then used to Study fundamental communication system performance Trade-offs among transmitted optical power, range, link geometry, data rate, and bit error rate. Both weak and strong solar background radiation scenarios are considered to bound detection performance. These results provide guidelines to system design.

Paiella A. - One of the best experts on this subject based on the ideXlab platform.

  • The short wavelength instrument for the polarization explorer balloon-borne experiment: Polarization modulation issues
    'Wiley', 2019
    Co-Authors: Columbro F., Battistelli E. S., Coppolecchia A., D'alessandro G., De Bernardis P., Lamagna L., Masi S., Pagano L., Paiella A., Piacentini F.
    Abstract:

    In this paper we investigate the impact of using a polarization modulator in The Short Wavelength Instrument for the Polarization Explorer (SWIPE) of the large scale polarization explorer (LSPE). The experiment is optimized to measure the linear polarization of the cosmic microwave background at large angular scales during a circumpolar long-duration stratospheric balloon mission, and uses multimode bolometers cooled to.3 K. The 330 detectors cover three bands at 140, 220, and 240 GHz. Polarimetry is achieved by means of a large rotating half-wave plate (HWP) and a single wire-grid polarizer in front of the arrays. The polarization modulator is the first polarization-active component of the optical chain, reducing significantly the effect of instrumental polarization. A Trade-off Study comparing stepped versus spinning HWPs drives the choice towards the second. Modulating the cosmic microwave background polarization signal at four times the spin frequency moves it away from 1/f noise from the detectors and the residual atmosphere. The HWP is cooled to 1.6 K to reduce the background on the detectors. Furthermore, its polarized emission combined with the emission of the polarizer produces spurious signals modulated at 2f and 4f. The 4f component is synchronous with the signal of interest and has to characterized to be removed from cosmological data

  • The short wavelength instrument for the polarization explorer balloon-borne experiment: Polarization modulation issues
    'Wiley', 2019
    Co-Authors: Columbro F., Battistelli E. S., Coppolecchia A., D'alessandro G., De Bernardis P., Lamagna L., Masi S., Pagano L., Paiella A., Piacentini F.
    Abstract:

    In this paper we investigate the impact of using a polarization modulator in the Short Wavelenght Instrument for the Polarization Explorer (SWIPE) of the Large Scale Polarization Explorer (LSPE). The experiment is optimized to measure the linear polarization of the Cosmic Microwave Background at large angular scales during a circumpolar long-duration stratospheric balloon mission, and uses multi-mode bolometers cooled at 0.3 K. The 330 detectors cover 3 bands at 140 GHz, 220 GHz and 240 GHz. Polarimetry is achieved by means of a large rotating half-wave plate (HWP) and a single wire-grid polarizer in front of the arrays. The polarization modulator is the first polarization-active component of the optical chain, reducing significantly the effect of instrumental polarization. A Trade-off Study comparing stepped vs spinning HWPs drives the choice towards the second. Modulating the CMB polarization signal at 4 times the spin frequency moves it away from $1/f$ noise from the detectors and the residual atmosphere. The HWP is cooled at 1.6 K to reduce the background on the detectors. Furthermore its polarized emission combined with the emission of the polarizer produces spurious signals modulated at $2f$ and $4f$. The $4f$ component is synchronous with the signal of interest and has to characterized to be removed from cosmological data.Comment: Proceeding of IWARA 201