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  • A signal-processed antenna system and the simulation of the effects of balanced-mixer frequency conversion

    Creator:
    Spencer, Kenneth Edward
    Abstract:
    In this paper a signal-processed antenna and receiver system is proposed and analyzed. In addition, a simulation of the balanced-mixer portion of the processing system is made on a hybrid computer to find the bandwidth limitations for the total system. The system utilizes both the amplitude and phase information of...
    Resource Type:
    Dissertation
    Full Text:
    = L V cos (cos +mca2)t m=-q V sin Tra m m C Tram -am) am = 2td;(fs+mf2-fs) (a) Pulse envelope

  • NMR study of novel oxides

    Creator:
    Roberts, Neil (Neil Gregory)
    Abstract:
    We report ²⁷Al and ⁶⁹,⁷¹Ga impurity and ⁶⁷Zn host species NMR experiments on ZnO powders containing Al or Ga dopants in the range 0.03 to 3 at. %. Spectral analysis of the ⁶⁷Zn and ⁶⁹Ga quadrupole powder patterns indicate gallium is substitutional for zinc and the electric quadrupole coupling of...
    Resource Type:
    Dissertation
    Full Text:
    ) ..................................................................................................... 51 4-9: 27 spin-lattice relaxation rate vs. impurity concentration in sample series A1(x

  • Design techniques for wideband low-power Delta-Sigma analog-to-digital converters

    Creator:
    Wang, Yan
    Abstract:
    Delta-Sigma (ΔΣ) analog-to-digital converters (ADCs) are traditionally used in high quality audio systems, instrumentation and measurement (I&M) and biomedical devices. With the continued downscaling of CMOS technology, they are becoming popular in wideband applications such as wireless and wired communication systems,high-definition television and radar systems. There are two general realizations...
    Resource Type:
    Dissertation
    Full Text:
    ......................................................................................... 51 3.6 Conclusions

  • On the photoresponse of several novel oligoacene and anthradithiophene derivatives

    Creator:
    Day, Jonathan
    Abstract:
    The results of an investigation into carrier dynamics in several novel functionalized and solution-processable pentacene and anthradithiophene derivatives are reported. Measurements were made of real-time photoresponse of polycrystalline thin films of these materials to ultrafast laser pulses, on picosecond to microsecond time-scales, as well as measurements of dark current and...
    Resource Type:
    Dissertation
    Full Text:
    plate; WP: Wollaston prism; and BD: balanced detector. (b) Single-scan THz trace (FWHM 250 fs) and (c

  • Context matters : A multi-scale assessment of riparian tree response to upslope density reduction

    Creator:
    Ruzicka, Kenneth J., 1982-
    Abstract:
    Forest management is rapidly undergoing a transformation from a discipline based on efficient commodity production to one for multiple uses, especially on federally managed land in the United States. This new management paradigm has challenged silviculturists to develop and adapt forest management techniques that can deal with increased demands. Using...
    Resource Type:
    Dissertation

  • Tidal influence on downstream fining in gravel-bed rivers

    Creator:
    Coles, Derron Rafiq
    Abstract:
    This research examines the downstream fining phenomenon as it operates in coastal gravel-bed rivers of Oregon. Downstream fining is a change in bed composition toward smaller sediment sizes in the downstream direction. Changes in stream flow discharge and channel slope affect the rate of bed-load transport, thereby altering the downstream...
    Resource Type:
    Dissertation
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    decreased from 51 mm at river mile 27 to 23 mm at river mile 0. Trask River surface particle sizes

  • Effect of waterborne preservative treatments on allowable stress design values

    Creator:
    Winandy, Jerrold E.
    Resource Type:
    Dissertation
    Full Text:
    right). Dashed lines represent the 95 percent confidence limits of the 90 wafers. 51 3.2 Moisture

  • Investigation and mitigation of the adverse effects of PWM adjustable speed drives

    Creator:
    Zhang, Haoran
    Abstract:
    With the introduction of high speed semiconductor power devices and the increased application of adjustable speed drives (ASDs) for efficient speed control of ac motors, there has been a growing number of costly motor-drive related process failures. It has been found that the high dv/dt and high switching frequency have...
    Resource Type:
    Dissertation
    Full Text:
    EMI 49 2.3.2.3. Radiated EMI 51 2.3.3. EMI Generated by PWM Inverter and Induction Motor Drives 53

  • Systems tableau : an integrated approach to systems theory

    Creator:
    Inoue, Michael Shigeru
    Abstract:
    Systems Tableau is suggested as a convenient tool for the integration of the three phases of systems theory: the synthesis of a model from the analysis of a system; the evaluation of the model; and the decision-making process for the design and control of the resulting system. From a basic...
    Resource Type:
    Dissertation
    Full Text:
    interconnected components. 51 2. 3 Black box corresponding to Figure 2. 2. 52 2.4 A graph representation. 53

  • Smooth and roughened horizontal cylinders in periodic waves and current

    Creator:
    Teng, Chung-chu
    Resource Type:
    Dissertation
    Full Text:
    2.6 The Blasius' Equation 49 3. FLOW VISUALIZATION EXPERIMENTS OF HORIZONTAL CYLINDERS IN WAVES 51