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 29 for “"totem"”.
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CCM Totem Pole Bridgeless PFC with Ultra Fast IGBT
The totem pole PFC suffers from the Mosfet body diode reverse recovery issue which limits this topology adopted in the CCM high power condition. As the ultra-fast IGBT which is capable of providing 100 kHz switching frequency is available in the market, it is possible to apply the totem pole PFC in …
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Model planes and totem poles : methods for visualizing user models
Thesis (M.S.)--Massachusetts Institute of Technology, Program in Media Arts & Sciences, 1995.
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Study on Zero Crossing Detection in CRM Totem-pole PFC Converter
The totem-pole PFC is a promising candidate for achieving high efficiency and high-power-density power factor correction. Critical conduction mode (CRM) or triangular current mode (TCM) operation of totem-pole PFCs has become popular for achieving zero-voltage switching (ZVS). This enables pushing …
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The Paganist Totem Birds in Slavic Folklore: The Black and The White
… <p>This thesis will focus on two different bird totems that are encountered often throughout Slavic folklore. It will be focusing on the symbolism behind the animal as well as focusing on the animal-human relations that form, and lastly focusing on animal-human transformations that take place …
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Totems: Verifying the Integrity of Visual Information using Neural Light Field
… to image forensics: physically placing a totem into the scene before taking a photo that needs to be protected from manipulations. A totem is any reflective or refractive object such that when placed in a scene, it displays a distorted version of the scene, which is called a totem view. …
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Local energy management through mathematical modeling and optimization
(cont.) Extensions to the core TOTEM model include a demand charge model, used for making daily optimal control decisions when the electric bill includes a charge based on the monthly maximum power draw. The problem of heating, ventilation, and air conditioning (HVAC) control is treated separately …
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Necessary Myths
… Mitchell’s image framework of idol, fetish and totem, and Joseph Campbell’s work in archetypes and mono-mythology, I explore the history of the image-religion relationship through the philosophical concepts they share. In categorizing them I attempt to parse out the role each has had in shaping …
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Power Interface Design and System Stability Analysis for 400 V DC-Powered Data Centers
… loss and cable cost in data centers. A cascaded totem-pole bridgeless PFC converter to convert grid ac voltage to the 400 V dc voltage is proposed in this work. Three main control strategies are developed for the power converters. First, a model predictive control is developed for the cascaded …
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'They Were Known Accordingly’: The Journey of the Land Otter Pole and Memorial Pole at the Denver Art Museum
<p>In 2019, two Kaigani Haida (Alaskan Haida) totem poles (Xaadas Gyáa’ang) were re-raised in the renovated Northwest Coast gallery of the Denver Art Museum. Lee Wallace and his family, descendants of Haida carver Dwight Wallace and Dwight’s son John Wallace, led a ceremony that publicly …
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Courseware development for a laboratory class in power electronics
… soldered together. The last card, called the TriTotemII, implements three "totem-pole" circuits, which form the foundation of the converter topologies taught in the class. Finally the cards feature a unique method to attach oddly shaped devices using Unplated Through-hole Anchor Points. The lab …
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Characterization and Application of Wide-Band-Gap Devices for High Frequency Power Conversion
… and enhanced packaging, a GaN-based MHz totem-pole PFC rectifier is demonstrated with 99% peak efficiency and 700 W/in3 power density. The switching frequency of the PFC is more than ten times higher than the state-of-the-art industry product while it achieves best possible efficiency and …
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Utilização de Multicast na Disseminação de Escritas em Ambientes Replicados
… de grupo xAMp, da Universidade de Lisboa; Totem, Universidade da Califórnia; Transis da Universidade de Hebréia de Jerusalém; Horus, da Universidade de Cornell e Newtop da Universidade de Newcastle. Todos os sistemas descritos possuem características de comunicação de grupo e membership que …
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Ambivalence and penetration of boundaries in the worship of Dionysos: Analysing the enacting of psychical conflicts in religious ritual and myth, with reference to societal structure
… that a re-reading of Freud’s major thesis in Totem and Taboo via an engagement with the Dionysos myth and cult scholarship allows for a new understanding of dominant forms of hegemonic psychic and social formations that attempt to keep in place a false opposition of polis and phusis, self and …
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Design and Control of a Compact 7.2 kW GaN-Based Bidirectional Isolated On-Board Charger (OBC)
… ultra-high power densities of 14kW/L for Totem-Pole PFC, 37 kW/L for DAB, and 10 kW/L for the overall OBC, representing 2X, 5X, and 3X improvements over latest reference designs from Texas Instruments, ST Microelectronics, and WolfSpeed, respectively. Peak efficiencies of 99% for …
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Sostener la Escuela en la Virtualidad: los límites del Territorio
… fuera del mundo, a la vez que, como un totem, organiza (y jerarquiza) la vida. Tomando todo esto y a partir de las ideas de territorialización y desterritorialización, que proponen Deleuze y Guattari, se intenta pensar las problemáticas de cómo los sujetos se desenvuelven en los espacios …
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Structural observations at the southern Dead Sea Transform from seismic reflection data and ASTER satellite images
… die DST im Arava Tal zwischen Rotem Meer und Totem Meer, wo die Hauptstörung auch Arava Fault genannt wird. Das 100 km lange Profil erstreckte sich von Sede Boqer/Israel im Nordwesten nach Ma'an/Jordanien im Südosten und fällt mit dem zentralen Teil einer weitwinkelseismischen Profillinie …
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Gold Griot: Jean-Michel Basquiat Telling (His) Story in Art
… on the artist’s reclamation of this powerful totem. Traversing the perimeters of the Black Atlantic I show how Basquiat’s work has influenced both fine art and urban cultural practice in Britain. Through analysis of Basquiat’s self-portraits I will examine his repositioning the black subject, …
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Participatory Action Research for Emotionally Meaningful Stories
… work was conducted as part of the practice-led TOTeM research project and aspires to be associated with such works that have been able to make a methodological contribution by introducing theoretical insights, innovative methods and analytical concepts. In this study, the key finding is …
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Investigation of a GaN-Based Power Supply Topology Utilizing Solid State Transformer for Low Power Applications
… on solid-state transformer configuration with a totem-pole power factor corrector (PFC) front-end, a half-bridge series-resonant converter (SRC) for power conversion, and a current-doubler rectifier (CDR) at its output. A new equivalent circuit model for the converter is constructed consisting of …
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Switching-Loss Measurement of Current and Advanced Switching Devices for Medium-Power Systems
… buffer of the gate drive is comprised of D-PAK totem pole BJTs. This is able to drive both current and voltage driven devices, i.e. SiC J-FETs (current-driven) and other voltage-driven devices (i.e. MOSFETs and IGBTs). It also allows for TO-220 and TO-247 packaged power diodes.
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