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Your search keyword '"Lyon, S."' showing total 416 results
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416 results on '"Lyon, S."'

3. A hermetic on-cryostat helium source for low temperature experiments.

Author

Castoria, K. E., Byeon, H., Theis, J., Beysengulov, N. R., Glen, E. O., Koolstra, G., Sammon, M., Lyon, S. A., Pollanen, J., and Rees, D. G.

Subjects
LOW temperatures, HELIUM, LIQUID helium, SUPERCONDUCTING resonators, QUANTUM fluids, IMAGE stabilization
Abstract

We describe a helium source cell for use in cryogenic experiments that is hermetically sealed in situ on the cold plate of a cryostat. The source cell is filled with helium gas at room temperature and, subsequently, sealed using a cold weld crimping tool before the cryostat is closed and cooled down. At low temperatures, the helium condenses and collects in a connected experimental volume, as monitored via the frequency response of a planar superconducting resonator device sensitive to small amounts of liquid helium. This on-cryostat helium source negates the use of a filling tube between the cryogenic volumes and room temperature, thereby preventing unwanted effects such as temperature instabilities that arise from the thermomechanical motion of helium within the system. This helium source can be used in experiments investigating the properties of quantum fluids or to better thermalize quantum devices. [ABSTRACT FROM AUTHOR]

Published
2024
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39. Retrieval of Simultaneous Water‐Level Changes in Small Lakes With InSAR.

Author

Palomino‐Ángel, S., Vázquez, R. F., Hampel, H., Anaya, J. A., Mosquera, P. V., Lyon, S. W., and Jaramillo, F.

Subjects
PIXELS, REMOTE sensing by radar, LAKE restoration, SYNTHETIC aperture radar, RADAR interferometry, LAKES, WATER levels, WATER supply
Abstract

Monitoring water level changes is necessary to manage, conserve and restore natural, and anthropogenic lake systems. However, the in‐situ monitoring of lake systems is unfeasible due to limitations of costs and access. Furthermore, current remote sensing methods are restricted to large lakes and low spatial resolutions. We develop a novel approach using subsequential pixel‐wise observations of the Sentinel‐1B sensor based on interferometric synthetic aperture radar to detect water level changes in small lakes. We used 24 small ungauged lakes of the Cajas Massif lake system in Ecuador for development and validation. We found Differential Interferometric Synthetic Aperture Radar (DInSAR)‐derived water level changes across lakes to be consistent with precipitation, capturing the peak of the wet seasons. Furthermore, accumulated water level changes could be explained by differences in lake area among lakes. Although with limitations, this study shows the underutilized potential of DInSAR to understand water level changes in small lakes with current radar data availability. Plain Language Summary: Lakes are essential elements of the hydrological cycle, and changes in lakes water availability affect their aquatic and terrestrial ecosystems and their associated watersheds. Monitoring water level changes is necessary to manage lake systems worldwide; however, monitoring remote and small lakes is unfeasible due to limitations of costs and access. We develop a novel approach that combines satellite remote sensing radar imagery to detect water level changes in small lakes. We used 24 small and high‐altitude unmonitored lakes in Ecuador for development and validation. We found the water level changes across lakes to be consistent with precipitation in the region. Furthermore, accumulated water level changes could be explained by differences in lake area among lakes. Our methodology underpins the underutilized potential of satellite radar observations to understand water level changes in small lakes. It also has considerable potential for the near real‐time monitoring of lake systems worldwide from space observations. Key Points: We demonstrated the utility of synthetic aperture radar interferometry to track water level changes in small ungauged lakes simultaneouslyRegional precipitation and area of lakes conditioned the spatiotemporal patterns of changes in water levelIrregular topography and surrounding elements on the lake shores were crucial for the use of radar interferometry [ABSTRACT FROM AUTHOR]

Published
2022
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