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result(s) for
"Watts, Laurel A."
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A Lightweight Remote Sensing Payload for Wildfire Detection and Fire Radiative Power Measurements
by
McLaughlin, Richard J.
,
Schroeder, Paul
,
Leonardi, Angelina
in
Air quality
,
Aircraft
,
Cameras
2023
Small uncrewed aerial systems (sUASs) have the potential to serve as ideal platforms for high spatial and temporal resolution wildfire measurements to complement aircraft and satellite observations, but typically have very limited payload capacity. Recognizing the need for improved data from wildfire management and smoke forecasting communities and the potential advantages of sUAS platforms, the Nighttime Fire Observations eXperiment (NightFOX) project was funded by the US National Oceanic and Atmospheric Administration (NOAA) to develop a suite of miniaturized, relatively low-cost scientific instruments for wildfire-related measurements that would satisfy the size, weight and power constraints of a sUAS payload. Here we report on a remote sensing system developed under the NightFOX project that consists of three optical instruments with five individual sensors for wildfire mapping and fire radiative power measurement and a GPS-aided inertial navigation system module for aircraft position and attitude determination. The first instrument consists of two scanning telescopes with infrared (IR) channels using narrow wavelength bands near 1.6 and 4 µm to make fire radiative power measurements with a blackbody equivalent temperature range of 320–1500 °C. The second instrument is a broadband shortwave (0.95–1.7 µm) IR imager for high spatial resolution fire mapping. Both instruments are custom built. The third instrument is a commercial off-the-shelf visible/thermal IR dual camera. The entire system weighs about 1500 g and consumes approximately 15 W of power. The system has been successfully operated for fire observations using a Black Swift Technologies S2 small, fixed-wing UAS for flights over a prescribed grassland burn in Colorado and onboard an NOAA Twin Otter crewed aircraft over several western US wildfires during the 2019 Fire Influence on Regional to Global Environments and Air Quality (FIREX-AQ) field mission.
Journal Article
UAS Chromatograph for Atmospheric Trace Species (UCATS) – a versatile instrument for trace gas measurements on airborne platforms
by
Hintsa, Eric J.
,
Wolton, Laura P.
,
Rollins, Andrew W.
in
Air pollution
,
Airborne sensing
,
Aircraft
2021
UCATS (the UAS Chromatograph for Atmospheric Trace Species) was designed and built for observations of important atmospheric trace gases from unmanned aircraft systems (UAS) in the upper troposphere and lower stratosphere (UTLS). Initially it measured major chlorofluorocarbons (CFCs) and the stratospheric transport tracers nitrous oxide (N2O) and sulfur hexafluoride (SF6), using gas chromatography with electron capture detection. Compact commercial absorption spectrometers for ozone (O3) and water vapor (H2O) were added to enhance its capabilities on platforms with relatively small payloads. UCATS has since been reconfigured to measure methane (CH4), carbon monoxide (CO), and molecular hydrogen (H2) instead of CFCs and has undergone numerous upgrades to its subsystems. It has served as part of large payloads on stratospheric UAS missions to probe the tropical tropopause region and transport of air into the stratosphere; in piloted aircraft studies of greenhouse gases, transport, and chemistry in the troposphere; and in 2021 is scheduled to return to the study of stratospheric ozone and halogen compounds, one of its original goals. Each deployment brought different challenges, which were largely met or resolved. The design, capabilities, modifications, and some results from UCATS are shown and described here, including changes for future missions.
Journal Article
A Laser-Induced Fluorescence Instrument for Aircraft Measurements of Sulfur Dioxide in the Upper Troposphere and Lower Stratosphere
by
Giorgetta, Fabrizio R.
,
McLaughlin, Richard J.
,
Bui, Thaopaul V.
in
Aerosols
,
Air pollution
,
Airborne instruments
2016
This work describes the development and testing of a new instrument for in situ measurements of sulfur dioxide (SO2) on airborne platforms in the upper troposphere and lower stratosphere (UTLS). The instrument is based on the laser-induced fluorescence technique and uses the fifth harmonic of a tunable fiber-amplified semiconductor diode laser system at 1084.5 nm to excite SO2 at 216.9 nm. Sensitivity and background checks are achieved in flight by additions of SO2 calibration gas and zero air, respectively. Aircraft demonstration was performed during the NASA Volcano Plume Investigation Readiness and Gas-Phase and Aerosol Sulfur (VIRGAS) experiment, which was a series of flights using the NASA WB-57F during October 2015 based at Ellington Field and Harlingen, Texas. During these flights, the instrument successfully measured SO2 in the UTLS at background (non-volcanic) conditions with a precision of 2 ppt at 10 s and an overall uncertainty determined primarily by instrument drifts of +/- (16% + 0.9 ppt).
Journal Article
Unsettling science and religion
by
Stenmark, Lisa
,
Bauman, Whitney
in
Queer theory
,
Religion / Religion & Science
,
Religion / Sexuality & Gender Studies
2018
This book borrows from the intellectual labor of queer theory in order to unsettle—or \"queer\"—the discourses of “religion” and “science,” and, by extension, the “science and religion discourse.” Drawing intellectual and social cues from works by influential theorists such as Michel Foucault, Judith Butler, and Eve Sedgwick, chapters in this volume converge on at least three common features of queer theory. First, queer theory challenges givens that on occasion still undergird religiously and scientifically informed ways of thinking. Second, it takes embodiment seriously. Third, this engagement inevitably generates new pathways for thinking about how religious and scientific “truths” matter. These three features ultimately lend support to critical investigations into the meanings of “science” and “religion,” and the relationships between the two.
Use of Human Papillomavirus Type 6 Capsids to Detect Antibodies in People with Genital Warts
by
Galloway, Denise A.
,
Lee, Shu-Kuang
,
Habel, Laurel A.
in
Adult
,
Antibodies
,
Antibodies, Viral - blood
1995
Human papillomavirus (HPV) type 6 capsids were produced by recombinant vaccinia viruses and used in a capture ELISA to screen 901 human sera from three studies of genital HPVs. The highest seroprevalence was observed among subjects with recurrent genital warts. In a population-based case-control study of genital warts, 26 (58%) of 45 women with recurrent genital warts were seropositive compared with 19 (19%) of 101 control women with no history of genital warts (odds ratio, 6.5; 95% confidence interval, 3.0, 14.1). Among a cohort of pregnant women, 7 (88%) of 8 with recurrent warts were seropositive compared with 24 (30%) of 79 pregnant women with no such history. A significant association between seropositivity to HPV-6 capsids and the detection of HPV 6/11 DNA from genital specimens by polymerase chain reaction was also observed. Men with genital warts were less likely to be seropositive than were women with genital warts, and a positive association between the number of sex partners and seropositivity was observed among only the female university students.
Journal Article