Index Catalog // ScholarsArchive@OSU

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
Full Text:: 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

Simulating Wood Properties in the Context of a Growth and Yield Model for Planted Douglas-fir

Creator:: Osborne, Nathaniel L.
Abstract:: Forest growth and yield models are critical to supporting decision making in forestry, but often lack considerations for wood properties. The feasibility of simulating wood properties in the context of a Douglas-fir individual tree growth and yield model was evaluated. This assessment explored the effect of predicted sapwood width, stem...
Resource Type:: Dissertation
Full Text:: ). ................. 51 LIST OF FIGURES (Continued

Determination of interfacial tension from optical measurements of nucleation rates

Creator:: Tadayon, Pooya
Resource Type:: Dissertation
Full Text:: . MOLECULAR THEORY OF INTERFACIAL TENSION 51 4.1 The Pressure Tensor 52 4.2 The Liquid-Vapor Interface

Analysis of the atmospheric water vapor transport and the hydrologic cycle simulated in a global circulation model

Creator:: Chang, Jy-tai
Abstract:: In order to understand the atmospheric branch of the earth's hydrologic cycle on the global scale, an atmospheric moisture balance is diagnostically analyzed from the January and July data of the OSU atmospheric general circulation model, which has been integrated for thirty-nine months of simulation with seasonally-varying sea-surface temperature and...
Resource Type:: Dissertation
Full Text:: flux of composite July 51 (lO8Kg s1-). In upper layer dashed lines are for -0.35; 52 solid and dotted

Methods for the in vitro cultivation of cells from the tissues of salmonid fishes

Creator:: Fryer, John L.
Abstract:: Methods examined for the preparation of cells from tissues of salmonid fishes for primary cultivation were the fragment (explant) and enzyme dispersion techniques. Both methods were employed for the cultivation of a variety of tissues from Pacific salmon, Oncorhynchus spp., and the steelhead trout, Salmo gairdneri gairdneri. A technique was...
Resource Type:: Dissertation
Full Text:: planting (X 533) 51 62 62 65 65 67 67 69 69 71 71 LIST OF FIGURES Figure Page Coho salmon

Geotechnical significance of poorly crystalline soils derived from volcanic ash

Creator:: Thrall, F. G.
Resource Type:: Dissertation
Full Text:: Atterberg limits, in the 51 air dry state. 15 Distribution of Atterberg limits, in the 52 oven dry state

A microcomputer automated anodic stripping voltammetric analyzer for trace heavy metal speciation

Creator:: Dewald, Lamar Robert
Abstract:: An automated instrument based on a single-board microcomputer was developed for use in voltammetric analyses. Operator input of numerous experiment parameters allows any type of voltammetric analysis to be implemented and multiple scans to be run unattended. A three operational amplifier potentiostat is used to control the cell voltage and...
Resource Type:: Dissertation
Full Text:: FIGURES Figures Page 1. Block diagram of PSYM 50 2. Computer control diagram 51 3. Physical location

A production function analysis of water resource productivity in Pacific Northwest agriculture

Creator:: Holloway, Milton L.
Abstract:: The competition or rivalry for the use of water resources among economic sectors of the Pacific Northwest and among geographical regions of the western United States has intensified in recent years. This rivalry and the long run prospects for water shortages have increased the demand for research concerning the productivity...
Resource Type:: Dissertation
Full Text:: investment minus repayments) in the region up to 1965 totaled $715 million (63, p. 51). Individual

Mediation of conifer root growth by mycorrhizal fungi and plant growth regulators

Creator:: Scagel, Carolyn F.
Abstract:: Many mycorrhizosphere microorganisms can produce plant growth regulating compounds in vitro. Plant growth regulating compounds are known to mediate root growth and development. In reforestation practices, conifer tree seedling growth and survival are linked to rapid root growth and development after outplanting. Multifactorial experiments were conducted to document variations in...
Resource Type:: Dissertation
Full Text:: Creek Douglas-fir Cost Analysis . 335 TABLE A-51: Durrand Creek Englemann Spruce Cost Analysis. 336

Excited state molecular structural evolution and chemical reactivity studied by femtosecond stimulated Raman spectroscopy

Creator:: Han, Fangyuan
Abstract:: In this dissertation, my research work on excited state dynamics of small organic molecules in solutions is presented. Using femtosecond stimulated Raman spectroscopy (FSRS) as the main experimental tool, the excited state hydrogen-bonding dynamics (ESHBD) of Coumarin 102, a common laser dye molecule, in ethanol solution is examined with <150...
Resource Type:: Dissertation
Full Text:: common laser dye molecule, in ethanol solution is examined with <150 fs time resolution. The dynamics

Bridging the Gap Between Equilibrium Properties and Ultrafast Dynamics with Time-Resolved Spectroscopy of Functional Systems

Creator:: Krueger, Taylor D.
Abstract:: Ultrafast spectroscopy has recently gained momentum as a powerful, noninvasive characterization toolset capable of studying a diverse array of samples with applications in chemistry, physics, biology, engineering, and more. Two popular ultrafast spectroscopic techniques include femtosecond transient absorption (fs-TA) and femtosecond stimulated Raman spectroscopy (FSRS). The latter of these techniques...
Resource Type:: Dissertation
Full Text:: ………………………………………………...47 2.3 Femtosecond transient absorption (fs-TA)………………………………51 2.4 Femtosecond stimulated

Search Constraints

Search Results

Limit your search