Diffraction gratings have been proposed as replacements for transmissive optical elements in the next generation of gravitational wave detectors. However, they couple additional alignment noise to ...phase noise, and current models are based on unrealistic plane-wave expansion theories. There is a need for a description of grating-related phase noise which is compatible with standard interferometer tools. In this paper we investigate the grating-related phase shift by presenting a fully analytical Gaussian model for the phase accumulation of a displaced beam when diffracted from a grating. We consider a first-order modal decomposition as the method employed by simulation tools for off-axis beams. We show that the phase distribution of a typical displaced beam and a decomposed beam is accurate to within 3.9 × 10−8 radians. However, we find that the grating-related phase noise is not present, and this is further validated experimentally by the absence of a phase shift in beams with different modes. The phase noise must therefore be implemented manually into existing interferometer simulation tools.
We have established a program aimed at developing computer applications and web applets to be used for educational purposes as well as gravitational wave outreach activities. These applications and ...applets teach gravitational wave physics and technology. The computer programs are generated in collaboration with undergraduates and summer students as part of our teaching activities, and are freely distributed on a dedicated website. As part of this program, we have developed two computer-games related to gravitational wave science: 'Black Hole Pong' and 'Space Time Quest'. In this article we present an overview of our computer related outreach activities and discuss the games and their educational aspects, and report on some positive feedback received.
Medical Therapy for Inflammatory Bowel Disease Grevenitis, Panayiotis; Thomas, Arul; Lodhia, Nilesh
The Surgical clinics of North America,
12/2015, Volume:
95, Issue:
6
Journal Article
Peer reviewed
Surgeons often care for patients with inflammatory bowel disease (IBD) who are receiving therapies that can include 5-ASA compounds, steroids, immunomodulators, and biologics. The goal of these ...agents is to suppress intestinal inflammation, ultimately improving the quality of life in patients afflicted with IBD. Traditionally, an acceptable therapeutic endpoint was the resolution of symptoms, defined as clinical remission. However, as a result of recent advances in therapy, clinicians can now strive to achieve more stringent endpoints, such as endoscopic or histologic remission. Many different classes of agents can be used, individually or in combination, to achieve mucosal healing.
We have established a program aimed to the development of small computer applications and web applets to be used for educational purposes and to teach gravitational waves physics and technology, and ...for the general gravitational wave outreach activities. The computer programs are generated in collaboration with undergraduates and summer students as part of our teaching activities, and are freely distributed on a dedicated website. As part of this program, we have developed two computer-games related to gravitational wave science: 'Black Hole Pong' and 'Space Time Quest'. In this article we overview our computer related outreach activity, present and discuss the games and their educational aspects, and report on some positive feedback received.
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