52 research outputs found
SiPM Signal Processing via Multiple Linear Regression
This paper presents a novel approach using multiple linear regression to
process transient signals from silicon photomultipliers. The method provides
excellent noise suppression and pulse detection in scenarios with a high pulse
count rate and superimposed pulses. Insights into its implementation and
benchmark results are presented. We also show how this approach can be used to
automatically detect the pulse shape from a given transient signal, providing
good detection for count rates up to 90MHz. Experimental data are used to
present an application where this algorithm improves charge spectrum resolution
by an order of magnitude
Radiation Hardness of a Wide Spectral Range SiPM with Quasi-Spherical Junction
New pixel geometries are on the rise to achieve high sensitivity in
near-infrared wavelengths with silicon photomultipliers (SiPMs). We test
prototypes of the tip avalanche photo-diodes, which feature a quasi-spherical
p-n junction and a high photodetection efficiency over a wide spectral range,
and analyze the performance after neutron irradiation. The observed increase in
dark count rate is significantly smaller than for a SiPM with a conventional
design, indicating a good radiation hardness of the pixel geometry.Comment: 8 pages, 7 figures. Submitted to NIM Proceedings. This work was
presented at the NDIP20 conferenc
Evaluating the use of prostate-specific antigen as an instrument for early detection of prostate cancer beyond urologists: Results of a representative cross-sectional questionnaire study of general practitioners and internal specialists
OBJECTIVES The aim of this cross-sectional study was to evaluate the value of prostate-specific antigen (PSA) testing as a tool for early detection of prostate cancer (PCa) applied by general practitioners (GPs) and internal specialists (ISs) as well as to assess criteria leading to the application of PSA-based early PCa detection.
METHODS Between May and December 2012, a questionnaire containing 16 items was sent to 600 GPs and ISs in the federal state Brandenburg and in Berlin (Germany). The independent influence of several criteria on the decision of GPs and ISs to apply PSA-based early PCa detection was assessed by multivariate logistic regression analysis (MLRA).
RESULTS 392 evaluable questionnaires were collected (return rate 65%). 81% of the physicians declared that they apply PSA testing for early PCa detection; of these, 58 and 15% would screen patients until the age of 80 and 90 years, respectively. In case of a pathological PSA level, 77% would immediately refer the patient to a urologist, while 13% would re-assess elevated PSA levels after 3-12 months. Based on MLRA, the following criteria were independently associated with a positive attitude towards PSA-based early PCa detection: specialisation (application of early detection more frequent for GPs and hospital-based ISs) (OR 3.12; p < 0.001), physicians who use exclusively GP or IS education (OR 3.95; p = 0.002), and physicians who recommend yearly PSA assessment after the age of 50 (OR 6.85; p < 0.001).
CONCLUSIONS GPs and ISs frequently apply PSA-based early PCa detection. In doing so, 13% would initiate specific referral to a urologist in case of pathological PSA values too late. Improvement of this situation could possibly result from specific educational activities for non-urological physicians active in fields of urological core capabilities, which should be guided by joint boards of the national associations of urology and general medicine
Schwingungsrotations-energieverteilung und Relaxationsprozesse im HF-Laser. - Vibrotational Energy Distribution and Relaxation Processes in the HF-Laser.
Anharmonic V-V Pumping with resonant IR-Pulselaser-Absorption modelling of the excitation process for hydrogen fluoride
Absorber-free laser transmission welding of transparent polymers using fixed focus optics and 3D laser scanner
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