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  • A Thermal Transport Model For The Upper Aquifer Of The Little Miami Aquifer System, Cincinnati, Ohio

    Etd thumbnail: A Thermal Transport Model For The Upper Aquifer Of The Little Miami Aquifer System, Cincinnati, Ohio
    Type:
    Etd
    摘抄:
    Abstract not available.
    作者:
    Dameron, Lisa M.
    提交者:
    UC Libraries
    上传日期:
    03/26/2018
    更改日期:
    08/23/2019
    创建:
    1996
    证书:
    All rights reserved

  • Perceptual Adaptation In A Time Delayed Virtual Environment.

    Etd thumbnail: Perceptual Adaptation In A Time Delayed Virtual Environment.
    Type:
    Etd
    摘抄:
    Recent advances in virtual-interface and computer technologies, including helmet-mounted displays (HMDs), three-dimensional auditory displays, haptic displays, head and eye position tracking devices, and computer-generated imaging techniques, have permitted the development of multi-sensory, interactive virtual environments. In spite of the dramatic ability of these environments to represent the perceptual world, they are limited by the problem of time delay---the delay between the input to a system and its corresponding output. For example, in the case of HMDs, time delays are present in the sampling of head position by a tracking device attached to the user's helmet and the appearance of the updated image in the HMD. Such delays cause the image to lag behind the user's head movement, thereby causing the image to be displayed in an incorrect position.
    作者:
    Nelson, W. Todd.
    提交者:
    UC Libraries
    上传日期:
    03/26/2018
    更改日期:
    03/26/2018
    创建:
    1996
    证书:
    All rights reserved

  • Dynamics Of Gravity Waves.

    Etd thumbnail: Dynamics Of Gravity Waves.
    Type:
    Etd
    摘抄:
    This paper consists of three parts. Part I is gravity wave growth, saturation and decay with height; part II reflection of gravity waves from critical layer using realistic background atmosphere and background wind; part III perturbation treatment of minor species' response to gravity waves. In part I by using Newtonian cooling and Rayleigh friction approximations and by considering only the average effects of turbulence on gravity waves we have derived an optical potential, with which we have studied the propagation of gravity waves and their reflections at every height level. We have found that reflections from higher level due to viscosity and heat conduction is so small that no ducting can be sustained. part II is the continuation of He Fan's work. In our work we adopt the same two parameter optical potential to model the gravity wave--critical layer interaction but we relaxed the conduction of isothermalness of the background and the linearity of the wind profile and we use the more realistic wind models, so our results should be more meaningful. We have found that the reflection coefficients of gravity waves from critical layer range from 5% to 25%, which should be measurable. In part III we develop a perturbation scheme with which it is possible to calculate the minor species response to any order in the linear gravity wave, including a secular component of the response which leads to wave-induced diffusion of minor species. Calculations to third order over a wide range of wave parameters show that the nonlinear effects can be substantial. A result is that care must be taken when analyzing data from minor species fluctuations, so that frequencies due solely to the nonlinear nature of the minor species response are not attributed to gravity waves.
    作者:
    Li, Xuerong.
    提交者:
    UC Libraries
    上传日期:
    03/26/2018
    更改日期:
    03/26/2018
    创建:
    1996
    证书:
    All rights reserved