| 481. |
- Jackson, Miranda, et al.
(författare)
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PoGOLite : a balloon-borne soft gamma-ray polarimeter
- 2009
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Ingår i: 2009 IEEE NUCLEAR SCIENCE SYMPOSIUM CONFERENCE RECORD, VOLS 1-5. - 9781424439614 ; , s. 449-453
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Konferensbidrag (refereegranskat)abstract
- PoGOLite is a balloon-borne X-ray polarimeter, designed to measure the polarization of 25-80 keV X-rays. It is scheduled for a pathfinder flight in August 2010. This paper outlines the scientific motivation and the status of preparations of the payload.
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| 482. |
- Kanai, Y., et al.
(författare)
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Beam test of a prototype phoswich detector assembly for the PoGOLite astronomical soft gamma-ray polarimeter
- 2007
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Ingår i: Nuclear Instruments and Methods in Physics Research Section A. - : Elsevier BV. - 0168-9002 .- 1872-9576. ; 570:1, s. 61-71
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Tidskriftsartikel (refereegranskat)abstract
- We report about the beam test on a prototype of the balloon-based astronomical soft gamma-ray polarimeter, PoGOLite (Polarized Gamma-ray Observer-Light Version) conducted at KEK Photon Factory, a synchrotron radiation facility in Japan. The synchrotron beam was set at 30, 50, and 70 keV and its polarization was monitored by a calibrated polarimeter. The goal of the experiment was to validate the flight design of the polarimeter. PoGOLite is designed to measure polarization by detecting a Compton scattering and the subsequent photo-absorption in an array of 217 well-type phoswich detector cells (PDCs). The test setup included a first flight model PDC and a front-end electronics to select and reconstruct valid Compton scattering events. The experiment has verified that the flight PDC can detect recoil electrons and select valid Compton scattering events down to 30 keV from background. The measure azimuthal modulations (34.4%, 35.8% and 37.2% at 30, 50, and 70 keV, respectively) agreed within 10% (relative) with the predictions by Geant4 implemented with dependence on the initial and final photon polarizations.
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| 483. |
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| 484. |
- Kiefer, F., et al.
(författare)
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Hint of an exocomet transit in the CHEOPS light curve of HD 172555
- 2023
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 671
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Tidskriftsartikel (refereegranskat)abstract
- HD 172555 is a young (∼20 Myr) A7V star surrounded by a 10 au wide debris disk suspected to be replenished partly by collisions between large planetesimals. Small evaporating transiting bodies, that is exocomets, have also been detected in this system by spectroscopy. After β Pictoris, this is another example of a system possibly witnessing a phase of the heavy bombardment of planetesimals. In such a system, small bodies trace dynamical evolution processes. We aim to constrain their dust content by using transit photometry. We performed a 2-day-long photometric monitoring of HD 172555 with the CHEOPS space telescope in order to detect shallow transits of exocomets with a typical expected duration of a few hours. The large oscillations in the light curve indicate that HD 172555 is a δ Scuti pulsating star. After removing those dominating oscillations, we found a hint of a transient absorption. If fitted with an exocomet transit model, it would correspond to an evaporating body passing near the star at a distance of 6.8±1.4R∗ (or 0.05±0.01 au) with a radius of 2.5 km. These properties are comparable to those of the exocomets already found in this system using spectroscopy, as well as those found in the β Pic system. The nuclei of the Solar System's Jupiter family comets, with radii of 2-6 km, are also comparable in size. This is the first piece of evidence of an exocomet photometric transit detection in the young system of HD 172555.
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| 485. |
- Kiss, A, et al.
(författare)
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Non-monotonic cellular responses to heterogeneity in talin protein expression-level
- 2015
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Ingår i: Integrative biology : quantitative biosciences from nano to macro. - : Oxford University Press (OUP). - 1757-9708. ; 7:10, s. 1171-1185
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Tidskriftsartikel (refereegranskat)abstract
- Correlative imaging in single-cells of both live migration and post-fixation talin-labeling revealed non-monotonic correspondences between cellular properties and talin expression-levels.
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| 486. |
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| 487. |
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| 488. |
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| 489. |
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| 490. |
- Kiss, Zelma H. T., et al.
(författare)
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"New and improved" DBS batteries?
- 2019
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Ingår i: Brain Stimulation. - : Elsevier. - 1935-861X .- 1876-4754. ; 12:4, s. 833-834
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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