Recent Submissions

  • Estimating Oceanic Turbulence Dissipation from Seismic Images 

    Author(s):Holbrook, W. Steven; Fer, Ilker; Schmitt, Raymond W.; Lizarralde, Daniel; Klymak, Jody M.; Helfrich, L. Cody; Kubichek, Robert F.; Holbrook, W. Steven; Fer, Ilker; Schmitt, Raymond W.; Lizarralde, Daniel; Klymak, Jody M.; Helfrich, L. Cody; Kubichek, Robert F.
    Date:2013-08-01
    Seismic images of oceanic thermohaline finestructure record vertical displacements from internal waves and turbulence over large sections at unprecedented horizontal resolution. Where reflections follow isopycnals, their ...
  • High Bandwidth Constant Current Modulation Circuit for Carrier Lifetime Measurements in Semiconductor Lasers 

    Author(s):Singh, Umesh; Pikal, Jon M.; Singh, Umesh; Pikal, Jon M.
    Date:2012-02-23
    In this paper we present a novel implementation of high bandwidth constant modulation current circuit to the traditional small signal optical response technique used to determine the differential carrier lifetime of a ...
  • Carrier Recombination Dynamics Investigations of Strain-Compensated InGaAsN Quantum Wells 

    Author(s):Xu, Lifang; Patel, Dinesh; Menoni, Carmen S.; Pikal, Jon M.; Yeh, Jeng-Ya; Huang, J. Y. T.; Mawst, Luke J.; Tansu, Nelson; Xu, Lifang; Patel, Dinesh; Menoni, Carmen S.; Pikal, Jon M.; Yeh, Jeng-Ya; Huang, J. Y. T.; Mawst, Luke J.; Tansu, Nelson
    Date:2012-12-01
    The time evolution of the photoluminescence (PL) of 1300-nm emitting InGaAsN/GaAs/GaAsP strain-compensated single quantum well (QW) in the temperature range of T = 10 K – 300 K is investigated. The PL spectra observed at ...
  • Modified Command Feedforward Tracking Control System Applied to the PRRR-RR Parallel Mechanism, A 

    Author(s):Parkins, Jeffrey A.; O'Brien, John F.; Parkins, Jeffrey A.; O'Brien, John F.
    Date:2012-04-26
    The development of a prototype two degree-of-freedom parallel mechanism for application to unmanned ground vehicle target tracking is presented. The mechanism is extremely simple, decoupling the two end-effector degrees-of- ...
  • Two Degree-of-Freedom Parallel Mechanisms for High Bandwidth Vibration Suppression and Tracking 

    Author(s):Carruthers, Dustin J.; O'Brien, John F.; Carruthers, Dustin J.; O'Brien, John F.
    Date:2011-04-27
    Limited degree-of-freedom (DOF) parallel kinematic mechanisms (PKM) are capable of high bandwidth tracking and disturbance rejection with smaller actuators than are required for serial machines. A high performance ...
  • Multi-Agent Orbit Design For Perception Enhancement Purpose 

    Author(s):Nourzadeh, Hamidreza; McInroy, John E.; Nourzadeh, Hamidreza; McInroy, John E.
    Date:2013-12-27
    This paper develops a robust optimization based method to design orbits on which the sensory perception of the desired physical quantities are maximized. It also demonstrates how to incorporate various constraints imposed ...
  • Homography-Based Change Detection for Space-Based Satellite Inspection 

    Author(s):Buffington, Ryan L.; McInroy, John E.; Buffington, Ryan L.; McInroy, John E.
    Date:2011-05-19
    In order to maintain space situational awareness, it is necessary to maintain surveillance of objects in Earth orbit. A system of space-based imaging sensors could make much more detailed inspections of the existing resident ...
  • Change Detection for Visual Satellite Inspection Using Pose Estimation and Image Synthesis 

    Author(s):Buffington, Ryan L.; McInroy, John E.; Buffington, Ryan L.; McInroy, John E.
    Date:2011-05-20
    Satellites are subject to harsh lighting conditions which make visual inspection difficult. Automated systems which detect changes in the appearance of a satellite can generate false positives in the presence of intense ...
  • Impacts of Aerosol Particles on the Microphysical and Radiative Properties of Stratocumulus Clouds Over the Southeast Pacific Ocean 

    Author(s):Twohy, C. H.; Anderson, Jeffrey R.; Toohey, D. W.; Andrejczuk, M.; Adams, A.; Lytle, M.; George, C.; Wood, R.; Saide, P.; Spak, S.; Zuidema, P.; Leon, D.; Twohy, C. H.; Anderson, Jeffrey R.; Toohey, D. W.; Andrejczuk, M.; Adams, A.; Lytle, M.; George, C.; Wood, R.; Saide, P.; Spak, S.; Zuidema, P.; Leon, D.
    Date:2013-03-05
    The southeast Pacific Ocean is covered by the world's largest stratocumulus cloud layer, which has a strong impact on ocean temperatures and climate in the region. The effect of anthropogenic sources of aerosol particles ...