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This is the first report of a transverse carbon nanoelectrode for sensing translation events through a solid state nanopore. This device has application to the study of molecular transport and DNA sequencing. The device is fabricated on a silicon nitride membrane using electron beam stimulated oxidation of carbon (EBSOC) to first create a carbon nanowire. The nanowire is then encapsulated in a top...
Marine dinoflagellates of the genus Alexandrium can produce dangerous amounts of paralytic shellfish toxins at such low cell densities that water discoloration often associated with harmful algal blooms is not always evident, making detection of blooms during early stages extremely important. Our research focuses on developing a new method of molecular detection for multiple species of Alexandrium...
The patterning of carbon nanostructures by electron beam stimulated oxidation is described. Sputter deposited carbon thin films and carbon nanotubes are locally oxidized in a scanning electron microscope using injected water vapor. The resulting structures are examined with scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Electrical resistance obtained post-processing...
Previous cognitive modelling work has suggested that the decline of short-term memory (STM) capacity is the dominant factor of age-related decline on recall ability. We report the results of a set of experiments investigating in further detail the effect of varying short-term memory capacity on the recall of chess positions using the CHREST cognitive architecture, and demonstrate a good qualitative...
The fabrication of carbon nanostructures by direct writing with a scanning force microscope is described. A conductive atomic force tip is used to collect carbon from a glassy carbon substrate and then redeposit it onto a gold thin film under voltage control. The resulting patterns are examined using the same atomic force microscope and analyzed using x-ray microprobe elemental analysis. These carbon...
Nanopore DNA sequencing devices show promise for rapidly decoding genetic information, although single nucleotide detection appears to be beyond the sensitivity of present transmembrane current measurement schemes. In this paper, a nanodevice combining nanoelectrodes with a nanopore was made to measure the nucleotide dependent transverse tunneling currents during the translocation of DNA through the...
The input/output function for acoustic hearing can be characterized by the growth of loudness with sound pressure level and generally follows a compressive power law. In contrast, in electric hearing, loudness reportedly is an expansive function of applied electrical current but the specific shape of the function has not been fully determined. Loudness growth models have implications for the implementation...
The input/output function for acoustic hearing can be characterized by the growth of loudness with sound pressure level and generally follows a compressive power law. In contrast, in electric hearing, loudness reportedly is an expansive function of applied electrical current but the specific shape of the function has not been fully determined. Loudness growth models have implications for the implementation...
A microneedle array has been fabricated and applied to the measurement of transdermal skin potentials in human subjects. Potential changes were recorded in the vicinity of superficial wounds, confirming the generation of a lateral electric field in human skin. The measured electric field decays with distance from the wound edge, and is directed towards the wound. The measurement of endogenous fields...
The input/output function for acoustic hearing can be characterized by the growth of loudness with sound pressure level and generally follows a compressive power law. In contrast, in electric hearing, loudness reportedly is an expansive function of applied electrical current but the specific shape of the function has not been fully determined. Loudness growth models have implications for the implementation...
The time-varying state of polarization of an optical channel modified by the intensity of other channels in a three-channel WDM system is measured. It compares well with theory expanded from a previously published two-channel model
Property specifications concisely describe what a software system is supposed to do. It is surprisingly difficult to write these properties correctly. There are rigorous mathematical formalisms for representing properties, but these are often difficult to use. No matter what notation is used, however, there are often subtle, but important, details that need to be considered. PROPEL aims to make the...
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