Search Constraints

Start Over
Filtering by: Has journal Discrete and Continuous Dynamical Systems Remove constraint Has journal: Discrete and Continuous Dynamical Systems Decade 2000-2009 Remove constraint Decade: 2000-2009

Search Results

  • A Dynamical Systems Approach to the Treatment of Psychosis

    Creator:
    Badeau, Ann Marie
    Abstract:
    The purpose of this paper is to explore the potential value of using a computer simulated systems dynamics model to address psychosis in mental illness. Psychosis is defined as a syndrome which is associated with many mental disorders, not a specific disorder itself. Psychosis generally produces delusions and hallucinations and...
    Resource Type:
    Masters Thesis
    Full Text:
    . Mathematically, a dynamical system is described by an initial value problem. 8 Dynamical systems are

  • 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:
    continuous-amplitude signals) and the digital world (composed of discrete-time and discrete-amplitude

  • A preliminary study for task management environment external validation: correlation between continuous, discrete and mixed scenarios

    Creator:
    Vasquez Aguirre, Carlos Andres
    Abstract:
    Concurrent Task Management (CTM) can be defined as the process that human operators of complex systems perform to allocate their attention among multiple, simultaneous tasks. A challenge of CTM research is to create an experimental environment which is complex enough to model a real world multitasking situation. Also, this system...
    Resource Type:
    Masters Thesis
    Full Text:
    performance between continuous, discrete and mixed task scenarios. The study tested 75 participants in three

  • Continuous time input pipeline ADCs

    Creator:
    Gubbins, David Patrick
    Abstract:
    Analog-to-digital converters (ADCs) convert analog continuous time signals into discrete time, digital format. One precondition that must be met for conventional nyquist rate ADCs is that the input signal must be suitably band-limited to an input bandwidth less than the nyquist frequency. This mandates expensive anti-alias filters which contribute to...
    Resource Type:
    Dissertation
    Full Text:
    process of measuring the continuous analog signal at discrete and standard intervals. ADC operation in

  • A dynamical attractor governs beach response to storms

    Creator:
    Plant, Nathaniel G., Holland, K. Todd, and Holman, Robert A.
    Abstract:
    Sandbars are ubiquitous, yet not well understood beach features that change their position and shape in response to changing wave conditions. We propose and test a simple empirical model consisting of two coupled linear differential equations that represents bar dynamics in terms of wave forcing and two other state variables:...
    Resource Type:
    Article
    Full Text:
    to a 2-month data set, and the modeled behavior is examined with a stability analysis. The system is

  • Dynamical analysis of the upwelling circulation off central Chile

    Creator:
    Mesias, Jorge M., Matano, Ricardo P., and Strub, P. Ted
    Abstract:
    In this article we analyze the momentum and vorticity balances of a numerical simulation of the upwelling circulation off central Chile (34° –40°S) and its response to interannual local wind changes. Our analysis indicates that the path of the upwelling jet is strongly controlled by the bottom topography. This topographic...
    Resource Type:
    Article
    Full Text:
    Citation: Mesias, J. M., R. P. Matano, and P. T. Strub, Dynamical analysis of the upwelling circulation off

  • A survey on continuous-time modulators : theory, designs and implementations

    Creator:
    Gao, Xiaoran
    Abstract:
    Recently, delta-sigma modulation has become a widely applied technique for high-performance analog-to-digital conversion of narrow-band signals. Most of the early designs used discrete-time structure for good accuracy and good linearity. The transfer functions are independent of the clock frequency. However, high unity-gain bandwidths of the opamps are required to satisfy...
    Resource Type:
    Masters Thesis
    Full Text:
    . The discrete-time and continuous-time A modulators are compared. 2.1 Sampling and quantization The

  • Improved design techniques for analog and mixed circuits

    Creator:
    Nishida, Yoshio
    Abstract:
    Although the digital revolution can realize many of past analog components in the digital forms, our world is surrounded with analog signals such as voice, temperature, etc. The bridge between these two worlds is one of key performance limitations among overall systems and it includes analog filters and data converters....
    Resource Type:
    Dissertation
    Full Text:
    performance limitations among overall systems and it includes analog filters and data converters. This

  • A continuous time frequency translating delta Sigma Modulator

    Creator:
    Pulincherry, Anurag
    Abstract:
    This thesis presents a continuous time bandpass delta sigma modulator with frequency translation inside the delta sigma loop. The input IF signal is down converted to baseband after amplification by a low Q, wideband bandpass resonator. The down converted IF signal is digitized by a continuous time, second order lowpass...
    Resource Type:
    Masters Thesis
    Full Text:
    .......................................................................... 6 2.3. Continuous Time and Discrete Time Delta Sigma Modulators ............... 8 2.4. Lowpass and

  • A comparative study of lowpass continuous-time delta-sigma modulators with pulse-shaped DACs

    Creator:
    Fang, Jie
    Abstract:
    Recently, continuous-time ΔΣ modulators are appearing increasingly often in both the literature and the marketplace due to their features of inherent antialiasing and relaxed requirements for opamp and so on. However, several nonideal factors such as clock jitter, excess loop delay, inter-symbol interference and so on, degrade the SNR performance...
    Resource Type:
    Masters Thesis
    Full Text:
    ..................................................................................3 2. OVERVIEW OF CONTINUOUS-TIME ∆Σ MODULATORS .......................4 2.1 Discrete-Time and