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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 33 for “"alternating current (AC)"”.

  1. Rotational speed dependent motor properties

    Suzuki, Aya KMassachusetts Institute of Technology2018

    The coils of alternating current (AC) motors experience back electromotive force (EMF) at high rotational speeds, which acts against applied voltage and drops motor efficiency steeply. By reducing the magnetic flux surrounding the coil of the stator, back EMF can be reduced and motor efficiency can …

    mit Repository record

  2. Hardware model of a shipboard Zonal Electrical Distribution System (ZEDS) Alternating Current/Direct Current (AC/DC)

    Tidd, Chad N.Monterey California. Naval Postgraduate School2010

    … the DDG 51 Flight IIA, Arleigh Burke class, 60Hz Alternating Current (AC) and the future direct current (DC), zonal electrical distribution system (ZEDS). These distribution boards were designed and built for the purpose of testing electrical system components at the Massachusetts Institute of …

    nps Repository record

  3. Field Induced Polymer Electroluminescence

    Smith, Gregory McRaeWake Forest University2015

    This work presents a new approach to electroluminescence in organics using a device employing alternating current (AC) field-induced polymer electroluminescence (FIPEL). This device consists of a transparent conductor, polymer dielectric layers, charge generation layers, a conjugated polymer-based …

    wfu Repository record

  4. A low dispersion 2-GHz comparator

    Johnston, William F. (William Francis)Massachusetts Institute of Technology2001

    … automated VLSI tester by Teradyne Inc. With each new and faster CMOS logic VLSI microchips, faster and more precise comparators are needed to verify that the static discipline is being met on the many pins of the integrated circuit. As the error in the comparator is lowered, the VLSI …

    mit Repository record

  5. Development of three phase back to back converter with current flow control using raspberry Pi microcontroller

    Mamat, IbrahimUniversiti Tun Hussein Onn Malaysia2015

    A High-Voltage Direct Current (HVDC) electric power transmission system uses direct current form the bulk transmission of electrical power, in contrast with the common Alternating Current (AC) systems. For a long-distance transmission, HVDC systems may be less expensive and suffer lower electrical …

    uthm Repository record

  6. An Experimental Investigation of Electrowetting Modulated Nucleate Boiling

    Sur, AritraUniversity of Houston2014

    … nucleate boiling heat transfer. The working approach capitalizes on the complimentary roles of hydrophobicity and hydrophilicity in the fundamental processes of nucleate boiling, and takes advantage of the ability of EW to dynamically alter the surface wettability at different thermal loads. For …

    houston Repository record

  7. Hardware model of a shipboard zonal electrical distribution system (ZEDS) : alternating current/direct current (AC/DC)

    Tidd, Chad N. (Chad Norman)Massachusetts Institute of Technology2010

    … the DDG 51 Flight IIA, Arleigh Burke class, 60Hz Alternating Current (AC) and the future direct current (DC), zonal electrical distribution system (ZEDS). These distribution boards were designed and built for the purpose of testing electrical system components at the Massachusetts Institute of …

    mit Repository record

  8. Thermal-magnetic finite element model of a high frequency transformer

    Lesser, Beverly BrownVirginia Tech1989

    … magnetic flux density, and frequency. Current design methods are either empirical or based on linear, uncoupled models. To better understand the relationship between heat transfer, magnetic flux density, material properties, and core geometry in a miniature, high-frequency transformer, …

    vt Repository record

  9. The Proposal for Implementation of Controlled Power Rectifier (3000/4000KW) in MTA New York City Transit (MTA-NYCT)

    Islam, Md Aminul2017

    … need to be addressed. These issues include input Alternating Current (AC) interface requirements, the output Direct Current (DC) load profile, and overall stability in the output voltage for Train car loads.</p> <p>Understanding these issues, providing possible solutions and determining the means …

    cuny Repository record

  10. Modeling and control of an alternating-current photovoltaic module

    Esram, TrishanUniversity of Illinois at Urbana-Champaign2010

    … electricity, a commodity of everyday life, is currently being generated primarily from fossil fuels in the U.S. Despite the abundance of solar energy, the total electricity from photovoltaic (PV) sources is negligible, mainly because of the relatively high cost of PV systems. For PV electricity …

    uiuc Repository record

  11. The Impact of Electrical Standards on MVDC Shipboard Power Cable Size

    Malone, Joshua JamesMassachusetts Institute of Technology2022

    … been rising interest in medium voltage direct current (MVDC) power systems for several reasons, including compatibility with DC loads, reduction of induced currents and magnetic signatures, and avoidance of alternating current (AC) frequency synchronization issues when combining outputs from …

    mit Repository record

  12. Examination of Power Systems Solutions Considering High Voltage Direct Current Transmission

    Ridenour, Daniel KeithVirginia Tech2015

    Since the end of the Current Wars in the 19th Century, alternating current (AC) has dominated the production, transmission, and use of electrical energy. The chief reason for this dominance was (and continues to be) that AC offers a way minimize transmission losses yet transmit large power from …

    vt Repository record

  13. Methods for the Detection of Biological Analytes on Dendritic Surface-Enhanced Raman Scattering (SERS) Substrates

    Azimi, Shamim2024

    … be portable, affordable, and easy to use. Surface-enhanced Raman scattering (SERS) is a promising method for detecting chemical compounds in various media. However, traditional SERS struggles with direct detection due to weak signals and inconsistent results, stemming from low analyte …

    queens Repository record

  14. Development of Brain Computer Interface (BCI) system for integration with Functional Electrical Stimulation (FES) application

    Ahad, RosneeUniversiti Tun Hussein Onn Malaysia2015

    Brain-Computer Interface (BCI) is a communication tool that translates human desire for other devices. The intention is for the majority of patients who were not able to move as stroke, spinal cord injury and traumatic brain injury. The goal of this study was to develop and analysis of offline and …

    uthm Repository record

  15. Design of a 380 V/24 V DC Micro-Grid for Residential DC Distribution

    Webb, Victor-Juan EliUniversity of Toledo2013

    This research will investigate a direct current (DC) micro-grid for power distribution in residential households. DC distribution has a long history, being considered at the beginning with alternating current (AC) distribution; however, due to the ease of distributing AC power over a long distance …

    ohiolink Repository record

  16. Synthesis, molecular and solid state structures, and magnetic properties of sandwich lanthanide phthalocyanines lacking C-H bonds

    Graham, Wycliffe A.

    … without C-H bonds was synthesized and characterized. They are the bis[octakis(perfluoro i-C_3F_7) octakis(perfluoro)phthalocyaninato(2-)]M(III) complexes, formulated as (F_{64}Pc)_2MH, M = Tb, Dy, Lu, Y. Single molecular magnetic (SMM) behavior in the (F_{64}Pc)_2TbH and (F_{64}Pc)_2DyH …

    njit Repository record

  17. Magnetic noise studies in advanced metal particle tapes

    Ardeleanu, Paul ClaudiuUniversity of Central Lancashire2003

    The aim of this research was to achieve two objectives: assembly of magnetisation profiles and noise studies on flexible media. Magnetic profiles of the media were established using anhysteretic techniques derived from Alternating Current (AC) bias analogue recording. The intention of this …

    cent-lancashire Repository record

  18. Development of portable escherichia coli bacteria detection using resistive graphene-based immunosensor

    Md Rosni, NurliyanaUniversiti Tun Hussein Onn Malaysia2020

    Escherichia coli (E. coli) bacteria comes from the human and animal faeces. It is hazardous to human health and could cause death when not immediately treated. Therefore, it is crucial to detect E. coli bacteria in water before consuming it. Since many cases of water contaminated E. coli bacteria …

    uthm Repository record

  19. DIRECT VOLTAGE MEASUREMENTS USING BULK ACOUSTIC WAVES IN LiNbO3

    Patel, Nishant

    Accurate (< 1%) direct measurement of high voltage pulse amplitudes above 10 kilovolts becomes challenging due to voltage breakdown limitations in materials, parasitic impedance effects that can distort the pulse shape, and pickup of extraneous signals resulting from electromagnetic interference …

    unm Repository record

  20. An analysis of the sociotechnical transition process from the existing centralised alternating current voltage electrical system in the UK to one where distributed direct current voltage is used to meet the energy needs of the built environment

    Kinn, MC2016

    … the potential sociotechnical transition of the current UK centralised alternating current (AC) electricity system to one where distributed direct current (DC) systems may proliferate. The development of the new distributed DC system has the potential to address a number of global challenges …

    salford Repository record

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