86,561 research outputs found
Fusion splicing soft-glass suspended core fibers to solid silica fibers for optical fiber sensing
No full textWe report fusion splicing of soft-glass suspended small-core fibers to conventional silica single-mode fibers for integration with conventional fiber systems. Heat-induced damage to the microstructured fiber region is minimized by using a low-power iridium filament.Florian V. Englich, Erik P. Schartner, Dominic F. Murphy, Heike Ebendorff-Heidepriem, and Tanya M. Monr
Detection of molecular oxygen by magnetic field interaction with guided light within an optical fiber
No full textExtent: 4p.We report a novel fiber-optic sensing architecture for the detection of paramagnetic gases that exploits the interaction of a magnetic field with guided light to detect an active gaseous medium within a hollow-core photonic bandgap fiber. This first demonstration of a fiber-based Faraday Rotation Spectroscopy (FRS) sensor operates at 762.309 nm for the detection of molecular oxygen. The optical fiber sensor has a 14.8 cm long sensing region and 4.2 nL detection volume. A measured FRS spectrum with a signal-to-noise ratio of 9.5 proves the principle of this new gas sensor architecture.Florian V. Englich and Tanya M. Monr
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Magnetic field interaction with guided light for detection of an active gaseous medium within an optical fiber
No full textLink to a related website: http://pdfs.semanticscholar.org/04fc/a944490d6b18d0104358fe85193c48acb092.pdf, Open Access via UnpaywallWe report a novel fiber-optic sensing architecture for the detection of paramagnetic gases. By interacting a modulated magnetic field with guided light within a microstructured optical fiber, it is possible to exploit Faraday Rotation Spectroscopy (FRS) within unprecedentedly small sample volumes. This approach, which utilizes magnetic circularbirefringence and magnetic circular dichroism effects, is applied to a photonic bandgap fiber to detect molecular oxygen and operates at a wavelength of 762.309 nm. The optical fiber sensor has a 4.2 nL detection volume and 14.8 cm long sensing region. The observed FRS spectra are compared with a theoretical model that provides a first nderstanding of guided-mode FRS signals. This FRS guided-wave sensor offers the prospect of new compact sensing schemes.Florian V. Englich, Michal Grabka, David G. Lancaster, and Tanya M. Monr
Ammonia detection using near infrared diode laser based overtone spectroscopy
No full textWe describe a portable diode-laser-based sensor for NH3 detection using vibrational overtone absorption spectroscopy at 1.53 mm. Use of fiber-coupled optical elements makes such a trace gas sensor rugged and easy to align. On-line data acquisition and processing requiring ,30 s can be performed with a laptop PC running LabVIEW software. The gas sensor was used primarily for NH3 concentration measurements with a sensitivity of 0.7 parts per million ~signal-to-noise ratio of 3! over a two-week period in a bioreactor being developed at the NASA Johnson Space Center for water treatment technologies to support long-duration space missions. The feasibility of simultaneous, real-time measurements of NH3 and CO2 concentrations is also reported.Ricardo Claps, Florian V. Englich, Darrin P. Leleux, Dirk Richter, Frank K. Tittel, and Robert F. Cur
A microstructured optical fiber sensor for ion-sensing based on the photoinduced electron transfer effect
No full textWe employ the photoinduced electron transfer (PET) effect within suspended-core microstructured optical fiber to authenticate a new type of fluorescence based sensor for ion detection. A sensor design based on a simple model PET-fluoroionophore system and small core microstructured optical fiber is shown and the operational performance of the sensor to different concentrations of sodium is investigated. Future approaches to improving the sensor’s signal stability and sensitivity are discussed.Andrew C. Richardson, Tze Cheung Foo, Florian V. Englich, Heike Ebendorff-Heidepriem, Christopher J. Sumby and Tanya M. Monr
[Newspaper Clipping: Author Claims Evidence of Second JFK Assassin #1]
No full textNewspaper article titled "Author Claims Evidence of Second JFK Assassin." The article states that author Richard J. Whalen concluded "that there is circumstantial evidence to support the theory of a second assassin in the shooting of President John F. Kennedy.
Simultaneous multi-laser, multi-species trace-level sensing of gas mixtures by rapidly swept continuous-wave cavity-ringdown spectroscopy
No full textThe greenhouse-gas molecules CO2, CH4, and H2O are detected in air within a few ms by a novel cavity-ringdown laser-absorption spectroscopy technique using a rapidly swept optical cavity and multi-wavelength coherent radiation from a set of pre-tuned near-infrared diode lasers. The performance of various types of tunable diode laser, on which this technique depends, is evaluated. Our instrument is both sensitive and compact, as needed for reliable environmental monitoring with high absolute accuracy to detect trace concentrations of greenhouse gases in outdoor air.Yabai He, Ruifeng Kan, Florian V. Englich, Wenqing Liu and Brian J. Or
Also By The Same Author: AKTiveAuthor, a Citation Graph Approach to Name Disambiguation
No full textThe desire for definitive data and the semantic web drive for inference over heterogeneous data sources requires co-reference resolution to be performed on those data. In particular, name disambiguation is required to allow accurate publication lists, citation counts and impact measures to be determined. This paper describes a graph-based approach to author disambiguation on large-scale citation networks. Using self-citation, co-authorship and document source analyses, AKTiveAuthor clusters papers, achieving precision of 0.997 and recall of 0.818 over a test group of eight surname clusters
John F. Kennedy telegram to Roosevelt
No full textJersey Homesteads (later the Borough of Roosevelt) was established in the 1930s as an agro-industrial cooperative community. It was established specifically for urban Jewish garment workers, many of whom had emigrated from Europe. President John F. Kennedy sent a telegram to the citizens of Roosevelt, New Jersey, apologizing for not being able to attend the memorial dedication in honor of former President Franklin Delano Roosevelt. (Jersey Homesteads became Roosevelt in 1945 in honor of the president.) President Kennedy expressed his gratitude to the people of Roosevelt for constructing the memorial, and commented that it will serve as a constant reminder of Roosevelt's good works
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