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.
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Showing 1 to 20 of 2925 for “"width"”.
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Bounds on Urysohn width
The Urysohn d-width of a metric space quantifies how closely it can be approximated by a d-dimensional simplicial complex. Namely, the d-width of a space is at most w if it admits a continuous map to a d-complex with all fibers of diameter at most w. This notion was introduced in the context of …
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Width functions for hypertree decompositions
Tree-width, a fundamental notion in graph structure theory, measures how far a graph is from being acyclic. When applied to the underlying graph of a hypergraph or a model-theoretic structure (such as a database, a database query, or an instance of a constraint satisfaction problem) it also gives …
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Pulse-width and pulse-time modulators
Thesis (M.S.) Massachusetts Institute of Technology. Dept. of Electrical Engineering, 1947.
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Factors considered for increasing longwall panel width
… the factors considered for increasing panel width and the solutions to the technical concerns for increasing the longwall face width from the current accepted industry standard of 1050 feet to 1600 feet (320 m to 488 m). The process of increasing the width of longwall panels, while helping to …
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Instabilities of finite-width internal wave beams
… This thesis examines the instability of finite-width internal wave beams in order to extend the current understanding of internal wave instability into more realistic settings.
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Surface acoustic wave gratings of finite width
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1979.
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Design of high fidelity pulse width modulation inverter
Pulse-width modulation (PWM) is well established in power electronics as a basis for inverters with sinusoidal output voltages. It provides two crucial advantages: high power delivery efficiency and easy digital-to-analog demodulation. Thus PWM can be applied in audio signal processing chain as a …
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The number, width, and labels for racial categories
… these boundaries are influenced by category width (Pettigrew, 1958) and prejudice (McConahay et al., 1981). A morphing program produced target "persons" along a racial continuum (i.e., from Whites to Blacks). Category-Width and level of prejudice were expected to moderate the perceived number …
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Digital Pulse Width Modulation: Analysis, Algorithms, and Applications
When the input to a PWM modulator is a sequence of uniformly spaced samples of the original signal, the resulting uniform-sampling PWM signal has high distortion. It is possible to eliminate the distortion completely by converting the uniform-sampling input sequence into a natural-sampling sequence …
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Optimization of Systems With Pulse-Width-Modulated Control
Made available in DSpace on 2014-12-08T22:23:47Z (GMT). No. of bitstreams: 1 6511810.pdf: 1902352 bytes, checksum: b1b3adcd3bc0f358880ff859dba2af5d (MD5) Previous issue date: 1965
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Linearization of a pulse width modulated power amplifier
… this thesis is to investigate the use of pulse width modulation in a high efficiency integrated CMOS power amplifier for a wireless application. Though high efficiency CMOS power amplifiers exist in academia, the goal of this project is to explore pulse width modulation as a method of adjusting …
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A pulse-width-modulated controlled-transformer post regulator
The theory of operation of a controlled transformer is described. A PWM controlled transformer is proposed and implemented in a forward converter to provide post regulation. Experimental results are presented to verify the new control scheme. Overall efficiency of 82%-86% is achieved in a 200khz, …
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Soft-switching techniques for pulse-width-modulated converters
The concept of soft-switching pulse-width-modulated (PWM) technique was proposed aimed at combining the advantages of both the conventional PWM technique and the resonant technique. This work presents four new families of soft-switching PWM converters: the zero-voltage-switched (ZVS) PWM …
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The Application of Microprocessors to Pulse-Width-Modulated Inverters
The introduction gives consideration to the aspects of communication principles, power converters, PWM modulation techniques and the application of LSI intergrated circuits as regards their effect on the design of variable speed AC drives. <br/><br/>Chapter 1 includes background material where …
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Suppression of Noise Effects in Pulse Width Modulated Systems
Made available in DSpace on 2014-12-08T22:23:31Z (GMT). No. of bitstreams: 1 6408439.pdf: 1499591 bytes, checksum: d59356dd518a4a8c85e537d9a7acc4dd (MD5) Previous issue date: 1964
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Determining overland flow hydrographs from sections of nonuniform width
… were developed for sections of nonuniform width. In order to determine the dimensionless hydrographs the equations of momentum and continuity were solved implicitly. This method was chosen because it is unconditionally stable independent of the time and distance increment. Using Manning's …
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Collimator width Optimization in X-ray Luminescent Computed Tomography
… Simulations have been performed for various beam widths and noise & resolution metrics deduced. This information has been used in evaluating quality of images on basis of CT Figure of Merit & a modified Wang-Bovik Image Quality index. Simulations indicate the presence of an optimal setting which …
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The application of communication principles to pulse-width modulated inverters
… principles may be usefully applied to pulse-width modulated inverters to increase their useable frequency range, without increasing the switching frequency of the power devices.<br/><br/>The prior-art techniques of reducing harmonic distortion in pulse-width-modulated inverters is …
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