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Author: ping-shine shaw
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1. Using a Tunable Ultraviolet Laser for the Inactivation of Water Pathogens
Published: 9/22/2013
Authors: Thomas C Larason, Keith R Lykke, Ping-Shine Shaw, Lin Chungsan
Abstract: Ultraviolet (UV) radiation effectively inactivates common pathogens found in ground and surface waters such as Cryptosporidium, Giardia, and most bacterial pathogens (e.g. E. coli). Water treatment facilities are now using UV radiation for disinfect ...

2. SURF III: A flexible Synchrotron Radiation Source for Radiometry and Research
Published: 9/1/2011
Authors: Uwe Arp, Charles W Clark, Lu Deng, Nadir S. Faradzhev, Alex P. Farrell, Mitchell L. Furst, Steven E Grantham, Edward Walter Hagley, Shannon Bradley Hill, Thomas B Lucatorto, Ping-Shine Shaw, Charles S Tarrio, Robert Edward Vest
Abstract: The calculability of synchrotron radiation (SR) makes electron storage rings wonderful light sources for radiometry. The broadband nature of SR allows coverage of the whole spectral region from the x-ray to the far-infrared. Compact low-energy storag ...

3. Metrologia
Published: 7/8/2011
Authors: Uwe Arp, Zhigang Li, Ping-Shine Shaw, Mathias Richter, Roman Klein, Wolfgang Paustian, Reiner Thornagel
Abstract: We report on a successful bilateral inter-comparison between the Physikalisch-Technische Bundesanstalt (PTB) and the National Institute of Standards and Technology (NIST). In both laboratories deuterium lamps were calibrated using the calculability o ...

4. Determination of the quantum yield of the ferrioxalate and KI/KIO3 actinometers and a method for the calibration of radiometer detectors
Published: 7/5/2011
Authors: J R Bolton, Michaela I. Stefan, Ping-Shine Shaw, Keith R Lykke
Abstract: Abstract: The quantum yields for two popular actinometers have been determined using the tunable laser light source at the National Institute for Standards and Technology in Gaithersburg, MD. The power of this light source has been calibrated agains ...

5. Bilateral NIST-PTB Comparison of Spectral Responsivity in the VUV
Published: 1/20/2011
Authors: Uwe Arp, Ping-Shine Shaw, Zhigang Li, Alexander Gottwald, Mathias Richter
Abstract: To compare the calibration capabilities for the spectral responsivity in the vacuum-ultraviolet spectral region between 135 nm and 250 nm, PTB and NIST agreed on a bilateral comparison. Calibrations of semiconductor photodiodes as transfer detectors ...

6. Long-Term Monitoring of the Ultraviolet Irradiance Scale at the Facility for Irradiance Calibration Using Synchrotrons
Published: 6/18/2010
Authors: Zhigang Li, Ping-Shine Shaw, Uwe Arp, Charles E Gibson, Howard W Yoon, Keith R Lykke
Abstract: In 2004, the National Institute of Standards and Technology (NIST) established the ultraviolet (UV) spectral irradiance scale from 200 nm to 400 nm using the calculable irradiance of the Synchrotron Ultraviolet Radiation Facility (SURF). Since the es ...

7. Internal quantum efficiency modeling of silicon photodiodes
Published: 4/1/2010
Authors: Thomas R. Gentile, Steven W Brown, Keith R Lykke, Ping-Shine Shaw, John Taylor Woodward IV
Abstract: Results are presented for modeling of the internal quantum efficiency (IQE) of silicon photodiodes in the 400 nm to 900 nm wavelength range. The IQE data are based on measurements of the external quantum efficiencies of three transmission trap detec ...

8. Measurement of the ultraviolet-induced fluorescence yield from integrating spheres
Published: 6/2/2009
Authors: Ping-Shine Shaw, Uwe Arp, Keith R Lykke
Abstract: We report theory and measurements of a simple and absolute technique for the determination of the total emitted spectral fluorescence yield inside an integrating sphere from the sphere coating under irradiation with a monochromatic beam. This techniq ...

9. Ultraviolet degradation study of photomultiplier tubes at SURF III
Published: 5/8/2009
Authors: Ping-Shine Shaw, Lindsay Hum, Zhigang Li, Keith R Lykke, Michael Bishop
Abstract: Photomultiplier tubes (PMTs) are used in biological detection systems in order to detect the presence of biological warfare agents. To ensure proper operation of these biological detection systems, the performance of PMTs must be characterized in ter ...

10. On the Fluorescence From Integrating Spheres
Published: 7/20/2008
Authors: Ping-Shine Shaw, Zhigang Li
Abstract: Our recent study of the performance of integrating spheres shows prominent UV induced fluorescence features that are associated with contamination of the diffusing wall material by hydrocarbons. Because of multiple reflections of the radiation inside ...

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