217 research outputs found
Private health insurance in social health insurance countries: Market outcomes and policy implications
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POB4 USING CLAIMS DATA TO UNDERSTAND THE COSTS OF DIFFERENT HEALTH STATES FOR PATIENTS WITH CARDIOMETABOLIC RISK
PCN2 COST-EFFECTIVENESS OF NEW CERVICAL CANCER SCREENING TECHNOLOGIES:A GERMAN HEALTH TECHNOLOGY ASSESSMENT AND DECISION-ANALYSIS
Performance of the most recent Microchannel-Plate PMTs for the PANDA DIRC detectors at FAIR
In the PANDA experiment at the FAIR facility at GSI two DIRC (Detection of
Internally Reflected Cherenkov light) detectors will be used for /K
separation up to 4 GeV/c. Due to their location in a high magnetic field and
other stringent requirements like high detection efficiency, low dark count
rate, radiation hardness, long lifetime and good timing, MCP-PMTs
(microchannel-plate photomultiplier) were the best choice of photon sensors for
the DIRC detectors in the PANDA experiment. This paper will present the
performance of some of the latest 22 inch MCP-PMTs from Photek and
Photonis, including the first mass production tubes for the PANDA Barrel DIRC
from Photonis. Performance parameters like the collection efficiency (CE),
quantum efficiency (QE), and gain homogeneity were determined. The effect of
magnetic fields on some properties like gain and charge cloud width was
investigated as well. Apart from that the spatial distribution of many internal
parameters like time resolution, dark count rate, afterpulse ratio, charge
sharing crosstalk and recoil electrons were measured simultaneously with a
multihit capable DAQ system. The latest generation of Photonis MCP-PMTs shows
an unexpected "escalation" effect where the MCP-PMT itself produces photons.Comment: Proceedings contribution to RICH2022 (11th International Workshop on
Ring Imaging Cherenkov Detectors
New records of Hyachelia tortugae and H. lowryi.
12 pages : illustrations (some color), map ; 26 cm. Specimens collected by the American Museum of Natural History's Center for Biodiversity and Conservation as part of its ongoing program of Pacific sea turtle research and conservation. (Page 3)Amphipods of the genus Hyachelia collected during an epibiont survey conducted over three years (2009, 2010, and 2011) at Palmyra Atoll are reported. Both known species, i.e., Hyachelia tortugae Barnard, 1967, and Hyachelia lowryi Serejo and Sittrop, 2009, were collected from Pacific green turtles, Chelonia mydas (Linnaeus). Given the increased awareness of epibionts and the desire of researchers to make positive identifications, figures of the diagnostic features of both amphipod species are presented. The significance of the cooccurrence of these two species on Pacific green turtles (Chelonia mydas) is discussed
Lifetime and performance of the very latest microchannel-plate photomultipliers
The PANDA experiment at the FAIR facility at GSI will study hadron physics
using a high intensity antiproton beam of up to 15 GeV/c momentum to perform
high precision spectroscopy. Two DIRC detectors with their image planes
residing in an 1 T magnetic field will be used in the experiment. The
only suitable photon detectors for both DIRCs were identified to be
Microchannel-Plate Photomultipliers (MCP-PMTs). Since the aging problems of
MCP-PMTs were solved recently by coating the MCPs with the so-called
ALD-technique (atomic layer deposition) we are investigating devices which are
significantly improved with respect to other parameters, as, e.g., the
collection efficiency (CE) and the quantum efficiency (QE). The latest
generation of MCP-PMTs can reach a detective quantum efficiency DQE = QE - CE
of 30%. This paper will present the performance of the most advanced 53
53 mm ALD-coated MCP-PMTs from Photonis (8 8 and 3
100 anodes) and Photek (8 8 anodes), also inside the magnetic
field. With a picosecond laser and a multi-hit capable DAQ system which allows
read out up to 300 pixels simultaneously, parameters like darkcount rate,
afterpulse probability and time resolution can be investigated as a function of
incident photon position.Comment: Proceedings contribution to NDIP20 (9th Conference on New
Developments in Photodetection
Feasibility studies of the time-like proton electromagnetic form factor measurements with PANDA at FAIR
The possibility of measuring the proton electromagnetic form factors in the
time-like region at FAIR with the \PANDA detector is discussed. Detailed
simulations on signal efficiency for the annihilation of into a
lepton pair as well as for the most important background channels have been
performed. It is shown that precision measurements of the differential cross
section of the reaction can be obtained in a wide
angular and kinematical range. The individual determination of the moduli of
the electric and magnetic proton form factors will be possible up to a value of
momentum transfer squared of (GeV/c). The total cross section will be measured up to (GeV/c).
The results obtained from simulated events are compared to the existing data.
Sensitivity to the two photons exchange mechanism is also investigated.Comment: 12 pages, 4 tables, 8 figures Revised, added details on simulations,
4 tables, 9 figure
Feasibility studies of time-like proton electromagnetic form factors at PANDA at FAIR
Simulation results for future measurements of electromagnetic proton form
factors at \PANDA (FAIR) within the PandaRoot software framework are reported.
The statistical precision with which the proton form factors can be determined
is estimated. The signal channel is studied on the basis
of two different but consistent procedures. The suppression of the main
background channel, , is studied.
Furthermore, the background versus signal efficiency, statistical and
systematical uncertainties on the extracted proton form factors are evaluated
using two different procedures. The results are consistent with those of a
previous simulation study using an older, simplified framework. However, a
slightly better precision is achieved in the PandaRoot study in a large range
of momentum transfer, assuming the nominal beam conditions and detector
performance
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