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ASTROSAT/UVIT Near and Far Ultraviolet Properties of the M31 Bulge

International Journal of Astronomy and Astrophysics 2021年第2期11卷 151-174页

作者： Denis Leahy cole morgan Josep Postma Megan Buick Department of Physics and Astronomy University of Calgary Calgary Canada

AstroSat has surveyed M31 with the UVIT telescope from 2017 to 2019. The central bulge of M31 was observed in 2750 - 2850 A, 2000 - 2400 A, 1600 - 1850 A, 1450 - 1750 A, and 1200 - 1800 A filters. A radial profile analysis, averaged along elliptical contours which approximate the bulge shape, was carried out in each filter. The profiles follow a Sersic function with an excess for the inner ~8" in all filters, or can be fitted with two Sersic functions (including the excess). The ultraviolet colours of the bulge are found to change systematically with radius, with the center of the bulge bluer (hotter). We fit the UVIT spectral energy distributions (SEDs) for the whole bulge and for 10 elliptical annuli with single stellar population (SSP) models. A combination of two SSPs fits the UVIT SEDs much better than one SSP, and three SSPs fit the data best. The properties of the three SSPs are age, metallicity (Z) and mass of each SSP. The best fit model is a dominant old, metal-poor (1010 yr, , with the solar metallicity) population plus a 15% contribution from an intermediate (109.5 yr, ) population plus a small contribution (~2%) from a young high-metallicity (108.5 yr, ) population. The results are consistent with previous studies of M31 in optical: both reveal an active merger history for M31.

关键词： UV Astronomy Galaxies: M31

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Low-temperature processing of screen-printed piezoelectric KNbO3 with integration onto biodegradable paper substrates

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Microsystems & Nanoengineering 2023年第1期9卷 271-282页

作者： morgan M.Monroe LGuillermo Villanueva Danick Briand École Polytechnique Fédérale de Lausanne(EPFL) Soft Transducers LaboratoryInstitute of Mechanical Engineering2000NeuchâtelSwitzerland École Polytechnique Fédérale de Lausanne(EPFL) Advanced NEMS LaboratoryInstitute of Mechanical Engineering1015LausanneSwitzerland

The development of fully solution-processed,biodegradable piezoelectrics is a critical step in the development of green electronics towards the worldwide reduction of harmful electronic ***,recent printing processes for piezoelectrics are hindered by the high sintering temperatures required for conventional perovskite fabrication ***,a process was developed to manufacture lead-free printed piezoelectric devices at low temperatures to enable integration with eco-friendly substrates and electrodes.A printable ink was developed for screen printing potassium niobate(KNbO3)piezoelectric layers in microns of thickness at a maximum processing temperature of 120℃ with high *** parallel plate capacitor and cantilever devices were designed and manufactured to assess the quality of this ink and evaluate its physical,dielectric,and piezoelectric characteristics;including a comparison of behaviour between conventional silicon and biodegradable paper *** printed layers were 10.7–11.2μm thick,with acceptable surface roughness values in the range of 0.4-1.1μ*** relative permittivity of the piezoelectric layer was *** poling parameters were optimised for the piezoelectric response,with an average longitudinal piezoelectric coefficient for samples printed on paper substrates measured as d33,eff,paper=13.57±2.84 pC/N;the largest measured value was 18.37 pC/N on paper *** approach to printable biodegradable piezoelectrics opens the way forward for fully solution-processed green piezoelectric devices.

关键词： KNbO3 piezoelectric integration

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