Mathematical wind profiles

Augmented Fourier polynomials for mathematical representation of vertical profiles for horizontal wind velocitie

Mathematical wind profiles, parts 1, 2, 3, 4

Fourier holograph representation of wind velocity over Cape Kenned

A quantitative study of quasiparticle traps using the single-Cooper-pair-transistor

We use radio-frequency reflectometry to measure quasiparticle tunneling rates in the single-Cooper-pair-transistor. Devices with and without quasiparticle traps in proximity to the island are studied. A $10^2$ to $10^3$-fold reduction in the quasiparticle tunneling rate onto the island is observed in the case of quasiparticle traps. In the quasiparticle trap samples we also measure a commensurate decrease in quasiparticle tunneling rate off the island.Comment: 4 pages, 4 fig

Microsecond resolution of quasiparticle tunneling in the single-Cooper-pair-transistor

We present radio-frequency measurements on a single-Cooper-pair-transistor in which individual quasiparticle poisoning events were observed with microsecond temporal resolution. Thermal activation of the quasiparticle dynamics is investigated, and consequently, we are able to determine energetics of the poisoning and un-poisoning processes. In particular, we are able to assign an effective quasiparticle temperature to parameterize the poisoning rate.Comment: 4 pages, 4 fig

Energy gap measurement of nanostructured thin aluminium films for use in single Cooper-pair devices

Within the context of superconducting gap engineering, Al-\alox-Al tunnel junctions have been used to study the variation in superconducting gap, $\Delta$, with film thickness. Films of thickness 5, 7, 10 and 30 nm were used to form the small area superconductor-insulator-superconductor (SIS) tunnel junctions. In agreement with previous measurements we have observed an increase in the superconducting energy gap of aluminium with a decrease in film thickness. In addition, we find grain size in small area films with thickness \textbf{$\geq$} 10 nm has no appreciable effect on energy gap. Finally, we utilize 7 and 30 nm films in a single Cooper-pair transistor, and observe the modification of the finite bias transport processes due to the engineered gap profile

Development and operation of the twin radio frequency single electron transistor for solid state qubit readout

Ultra-sensitive detectors and readout devices based on the radio frequency single electron transistor (rf-SET) combine near quantum-limited sensitivity with fast operation. Here we describe a twin rf-SET detector that uses two superconducting rf-SETs to perform fast, real-time cross-correlated measurements in order to distinguish sub-electron signals from charge noise on microsecond time-scales. The twin rf-SET makes use of two tuned resonance circuits to simultaneously and independently address both rf-SETs using wavelength division multiplexing (WDM) and a single cryogenic amplifier. We focus on the operation of the twin rf-SET as a charge detector and evaluate the cross-talk between the two resonance circuits. Real time suppression of charge noise is demonstrated by cross correlating the signals from the two rf-SETs. For the case of simultaneous operation, the rf-SETs had charge sensitivities of $\delta q_{SET1} = 7.5 \mu e/\sqrt{Hz}$ and $\delta q_{SET2} = 4.4 \mu e/\sqrt{Hz}$.Comment: Updated version, including new content. Comments most welcome: [email protected] or [email protected]

Deed for sale from Davis Family to L. N. Box, H. Rutledge, and Nathaniel Jackson, 1878

From the Falcón Family Collection, contains personal, legal documents, photographs, family genealogy, and newspaper articles concerning various family members of the Falcón family. The largest of the series being that of correspondence between Clotilde Falcón and Alfredo Náñez. Deed for sale from Davis Family to L. N. Box, H. Rutledge, and Nathaniel Jackson, 1878, Container: 31, Box: 3, Folder: 126. University of Texas Rio Grande Valley Special Collections and Archives, Edinburg Campus. https://archives.lib.utrgv.edu/repositories/2/archival_objects/94842https://scholarworks.utrgv.edu/hidalgohist/1003/thumbnail.jp

The ultra‐cold polarized hydrogen jet project

Research is described on a jet of polarized atomic hydrogen. Atoms in the two lower hyperfine states are trapped at 0.4 k in a 5 T magnetic field. Microwaves at 140 GHz then drive transitions to the upper hyperfine states and these atoms are expelled from the field to form the beam. Atoms have been trapped, transitions driven, and atoms detected outside the trapping field, but preliminary measurements are not fully understood. Studies are continuing.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/87383/2/1311_1.pd