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 304 for “"Direct Current"”.
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Direct current hybrid vacuum breaker
… The first is arc interruption based on current oscillation. The second is interruption without an arc, like with a voltage commutation approach. The main difference is whether or not the interruption mechanism deals with the arc. Interrupting the arc not only causes erosion of the …
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A direct current compensator dynamo
Made available in DSpace on 2016-11-09T23:48:15Z (GMT). No. of bitstreams: 2 5976720_opt.pdf: 9644175 bytes, checksum: 194c5b9233710d8193a10264309fa807 (MD5) license.txt: 4183 bytes, checksum: 1dcc2037833d76bede73d5717587543b (MD5) Previous issue date: 1912
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A direct current differential relay
In a grounded direct current system, motor faults may occur which will not be indicated by ordinary protective devices, but which will affect motor operation or create unsafe conditions. All such faults are manifested by the fact that the current in one lead supplying the motor will be greater than …
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The electrolytic production of peroxydisulfuric acid using periodically reversed direct current and alternating current superimposed on direct current
… investigation to study the effect of varying the direct to reverse time ratio of periodically-reversed, direct current from 1.0 to 20.0 at an anode current density of 4.5 amperes per square centimeter, and to study the effect of alternating current of 60, 240, and 500 cycles per second, 0.2 to 4.5 …
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The electrolytic production of lead chromate using periodically reversed direct current and superimposed alternating current on direct current
… investigation to study the effect of varying the direct to reverse time ratio of periodically reversed direct current from 1.0 to 20.0 on the electrolytic production of lead chromate at an average anode current density of 0.0059 amperes per square centimeter, and to study the effect of 60 and …
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Transcranial direct current stimulation in Alzheimer's disease
… from the clinical trials related to transcranial direct current stimulation (tDCS) treatment of Alzheimer’s disease (AD) into a machine learning model of the disease to understand the long term impact of the treatment on disease progression over a decade. The three main contributions of this work …
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A low-drift transistorized direct-current amplifier
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1961.
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Radio frequency driven direct current electron beam source
A new type of electron beam source employing ion-induced secondary electron emission from cold cathodes is developed for feature charge neutralization during plasma etching. A low pressure (approximately 2 – 20 mTorr) inductively coupled plasma provides ions which impinge on a high secondary …
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Kernel function in direct-current resistivity sounding, The
Includes bibliographical references.
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Multifocal Transcranial Direct Current Stimulation to Modulate Motor Learning
Transcranial direct current stimulation (tDCS) is a non-invasive brain stimulation technique that modulates neural excitability in targeted brain regions, influencing processes such as motor learning. While tDCS has been previously shown to benefit motor skill acquisition, much of this research has …
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Direct-Current Power Flow Solvers and Energy Storage Sizing
… unsought challenges. With increasing smart grid directcurrent (DC) deployments in distribution feeders, microgrids, smart buildings, and highvoltage transmission, there is a need for better understanding the landscape of power flow (PF) solutions as well as for efficient PF solvers with …
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Second vertical derivative enhancement of direct current bipole-bipole data
Includes bibliographical references (pages 75-76).
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High Voltage Direct Current Energy Transmission Using Modular Multilevel Converters
<p>This thesis focus on high voltage direct current (HVdc) energy transmission using modular multilevel converter (MMC) based terminals. It provides a brief comparison between different HVdc technologies, focusing on voltage source converters (HVdc-VSC) with the MMC-based terminal emerging as the …
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Electrochemical Synthesis of Propylene Oxide With Alternating and Direct Current
Electro-organic processes typically contain complex reaction sequences which couple the heterogeneous electrode reactions with an extended homogeneous reaction pathway. An experimental - theoretical approach was applied to understand the coupled diffusion-reaction processes and establish general …
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Torque Controlled Drive for Permanent Magnet Direct Current Brushless Motors
… variable speed drive (VSD) based on a brushless direct current (BLDC) machine and discrete logic circuits. A practical VSD was built, capable of operating a BLDC machine in two quadrants, motoring and regenerative braking. The intended applications are electric scooters and electric bicycles, …
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Comparison of alternating-current and direct-current metallic arc-welded joints
LD2668 .T4 1940 M66
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Comparison of alternating-current and direct-current metallic arc-welded joints
LD2668 .T4 1940 M66
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Direct current distribution systems for residential areas powered by distributed generation
Power system began its journey with DC power as pioneered by Edison. However, this was soon rivalled by AC power and ultimately DC paradigm found itself quite obsolete, against the ongoing urge to adapt in favor of higher efficiency. AC became the choice for power transfer in all areas of the power …
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QUANTITATIVE RELIABILITY ANALYSIS OF A HIGH VOLTAGE DIRECT CURRENT TRANSMISSION SYSTEM
Reliability considerations are an important aspect of overall power system design, planning and operation. This thesis illustrates the application of probability techniques to the reliability evaluation of a three phase HVDC bridge composed of mercury arc valves. The approach is developed by which …
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