Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 398 for “"Ripple"”.
-
Control of Pseudo-Sinusoidal Switched Reluctance Motor with Zero Torque Ripple and Damped Input Current Ripple
… advantage and ruggedness. However, the torque ripple and bus current ripple of SRM restrict its application range compared with traditional AC and DC motors due to the doubly salient pole structure and the highly non-linear coupling between torque, rotor position and phase current. As a result …
-
A Modified Boost Converter with Reduced Input Current Ripple
… DC/DC converter. Reducing a converter’s input ripple helps prevent switching noise from spreading to other systems on a shared DC power bus. This thesis covers the analysis, simulation, and implementation of a recently-proposed boost converter topology, alongside an equivalent standard boost …
-
AC coupled ripple reduction method for chopper-stabilized amplifiers
… bandwidth, high frequency noise referred to as ripple noise. To reduce this ripple noise many topologies and techniques have been created and put into practice. However all of these topologies and techniques come at some cost in larger circuit area, higher power consumption, or increased noise. …
-
A flume study of ripple growth in fine sand.
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1968.
-
Design of feedforward active ripple filters for power converters
An active ripple filter is an electronic circuit which cancels or suppresses the ripple current and EMI generated by the power stage of a power converter, thus reducing the passive filtration requirements. This thesis presents the design and evaluation of various current sensing and injection …
-
Active torque ripple reduction in permanent-magnet AC motors
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
-
Torque-ripple compensation for an axial-airgap synchronous motor
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
-
Methods for Ripple Detection and Spike Sorting During Hippocampal Replay
… hippocampus, fast oscillations termed sharp wave ripples and an associated sequential firing of neurons, termed replay, have been identified as playing a crucial role in memory formation and learning. The term 'replay' is used since the observed spiking encodes patterns of past experiences. To …
-
Observation and characterisation of magnetisation ripple using Lorentz transmission electron microscopy
… the previous work of experimental magnetisation ripple characterisation is reviewed. A newly developed methodology for characterisation of large sets of Fresnel images displaying magnetisation ripple properties is presented which is utilised throughout the rest of the body of …
-
The Ripple Effect: The Economic Impact of Arizona Supervised Agricultural Experiences
… II multipliers were extracted to describe the ripple effect of student investments on the Arizona economy. The study provided documentation to support the experiential learning mission of agricultural education. The real-world learning opportunities that occur through SAE participation are …
-
Optimum Control for Minimization of Torque Ripple in Synchronous Reluctance Machines
… analysis for identifying the sources of torque ripple in electric machines. It includes the effect of conductor distribution in the machine, magnet flux density distribution, current harmonics and non-idealities in position and current sensors. Harmonic orders and magnitudes of torque ripple …
-
Active filters for 1 MHz power circuits under strict ripple limitations
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1987.
-
The influence of current and ripple development on seagrass transplant survival
… for a duration of six hours each, and current ripples developed and persisted in all cases. The ripples were characterized and related to the dislodgement of transplants from the sediment. The use of staples decreased the number of transplants that were dislodged. At lower velocities, …
-
A switching ripple based current sharing control system for celluar converters
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
-
A low ripple bi-directional battery charger/discharger using coupled inductor
… about a spacecraft power conversion system: low ripple current flowing through both battery and bus, and bi-directional power flow to and from the battery. This thesis introduces a novel low ripple current bi-directional battery charge/discharge converter using coupled-inductor. Bi-directional …
-
Analysis and design of a low-ripple coupled-inductor boost topology
… development, analysis, and design of a new low-ripple coupled-inductor boost topology. This topology is proposed for applications in which the conventional boost requires an input filter and two-stage output filter. One "zero-ripple" coupled magnetic provides both energy storage and second-order …
-
A 2-D Time-Dependent Ripple Prediction Model for Wave Dominated Flows
<p>The development of a new 2-D, time dependent ripple prediction model is presented which allows for the prediction of ripple wavelength, height and orientation. The model is an extension to that developed by Traykovski (2007) and uses an equilibrium ripple sub-module that provides the target …
-
The Ripple Effect: the Implications of Shootings At Institutions of Higher Education
<p>This study investigates how three institutions of higher education responded to the shootings at Virginia Polytechnic Institute and State University (Virginia Tech) in 2007. Current policies and practices were reviewed at the University of Pittsburgh (Pitt), James Madison University (JMU) and …
-
Ripple Effects: The Transformation of SFASU Women's Social clubs to National Sororities
<p>Shortly after Stephen F. Austin Teachers College (SFA) opened in 1923, students began organizing social clubs. By the late 1920s, women formed the Amities and Pine Burrs to develop friendships and a sense of belonging. The Fideles and Sigma Gammas arrived on campus in the late 1940s as more …
Page 1 of 20