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 58 for “"polyphase"”.
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A novel method of generating polyphase power
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1967. E.E.
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The output voltage of controlled polyphase rectifiers
The controlled polyphase rectifiers in current use employ delayed firing in some degree to obtain voltage control. Delayed firing increases the harmonic content of the rectified voltage to such an extent that the harmonics determined without firing delay are insignificant. The harmonic content …
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Least-Squares Approximation and Polyphase Decomposition for Pipelining Recursive filters
… a simple pipelined architecture based on a polyphase decomposition of the original filter.
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Polyphase Proterozoic tectonometamorphic history of the Taos Range, northern New Mexico
Proterozoic rocks in the Taos Range of northern New Mexico preserve components of a protracted tectonic history involving pre-1.7 Ga, 1.65 Ga, 1.4 Ga, and possible 1.1 Ga tectonism. The southern Taos Range is a 1.76 – 1.7 Ga volcano-plutonic complex with tectonically interlayered remnants of the …
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Transient currents of polyphase induction motors with a single-phase supply
Thesis: M.S., Massachusetts Institute of Technology, Department of Electrical Engineering, 1927
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A 5-6 Ghz Silicon-Germanium Vco With Tunable Polyphase Outputs
… voltage controlled oscillator (VCO) with tunable polyphase outputs. Circuits were designed and fabricated using the Motorola 0.4 ìm CDR1 SiGe BiCMOS process, which has four interconnect metal layers and a thick copper uppermost bump layer for high-quality radio frequency (RF) passives. The VCO …
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Polyphase deformation and metamorphism in the Penobscot Bay Area, Coastal Maine
Metasediments from portions of two of the six lithologic terranes in the Penobscot Bay area of coastal Maine, the Late Precambrian (?) to Ordovician(?) Copeland Formation and the Rider Bluff member of the Copeland Formation at the eastern margin of the Passagassawakeag (PGW) terrane and the …
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Microstructure of polyphase rocks : effects on friction, deformation behavior and melt distribution
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1997.
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Long polyphase sequences for adaptive mmse detector in asynchronous cdma plc network with impulsive noise
… using long binary and complex–valued polyphase spreading sequences, instead of short orthogonal codes due to their worse cross–correlation properties in asynchronous environments. This thesis avoids complex joint detection techniques at the receiver, such as multi– user detection and …
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History and timing of polyphase Proterozoic deformation in the Manzano thrust belt, central New Mexico
… is an important place to better characterize polyphase deformation and magmatism related to the assembly of Laurentia, particular the 1.65-1.60 Ga Mazatzal orogeny and the later 1.4 Ga thermo-tectonic event. This study focuses on the Los Pinos Mountains, near the southern end of the Manzano …
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Case study comparisons of standard and energy efficient polyphase induction motors subjected to unbalances phase voltages
… and economics of standard and energy efficient polyphase induction motors under unbalanced phase voltage conditions ofup to 5 percent. Motors sizes of 25, 50, 100,150,200, 250 and 300 hp are used in this investigation. Computer simulations are used to study the efficiencies, power losses and …
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Mesozoic tectonics of the Maria fold and thrust belt and McCoy basin : an examination of polyphase deformation and synorogenic response
… McCoy Basin to resolve kinematics and timing of polyphase deformation events related to the Mesozoic Cordilleran Orogeny in southeastern California. The Maria Fold and Thrust Belt (MFTB) is an east-west trending belt of amphibolite grade metamorphic rocks characterized by largely south-vergent …
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New stratigraphy, polyphase deformational history and basement-involved thrust belt model for the Proterozoic Uncompahgre Group and Vallecito Conglomerate, Needle Mountains, Colorado
… that the two cover units underwent a similar polyphase deformation sequence involving D1 north-directed thrusting, D2 macroscopic folding and south-directed thrusting and D3 macroscopic folding-associated high-temperature low-pressure metamorphism of ~ 500°C and 2-3 kbars. D1 thrusting is …
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Polyphase tectonics and metamorphism and their relation to movement on the Monte Largo shear zone in the Manzano Mountains, central New Mexico
The Proterozoic rocks of the Manzano Mountains of central New Mexico preserve evidence of multiple deformation events. The dominant foliation is the northeast-trending S2 that overprints the older S1 foliation in most places. Later S3 fabrics are present in many areas as well as S4 crenulations in …
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STRUCTURAL AND KINEMATIC INVESTIGATION OF THE DADEVILLE COMPLEX-BREVARD ZONE CONTACT (SOUTHERN APPALACHIANS): POLYPHASE EMPLACEMENT OF AN ALLOCHTHONOUS TERRANE ON THE LAURENTIAN MARGIN
<p>The Dadeville Complex (DC) lies in the Inner Piedmont of eastern Alabama and western Georgia. The DC formed as a volcanic island arc during the Taconic orogeny (Ordovician Period) and was accreted onto Laurentia during the Acadian orogeny (Devonian-Mississippian Periods); however, the mechanism …
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Polyphase Deformation, Thrust-Induced Strain and Metamorphism, and Mesozoic Stratigraphy of the Granite Wash Mountains, West-Central Arizona (Tectonics, Mylonite, Geophysics, Mineralization, Terranes)
The Granite Wash Mountains of west-central Arizona are composed of variably metamorphosed and deformed sedimentary and volcanic rocks, here called the 'Granite Wash' (GW) and 'Salome Peak' (SP) sequences. The GW sequence is at least 1500 meters thick, and can be divided into seven map units, the …
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Wavelet Factorization and Related Polynomials
… and better understanding factorizations of polyphase matrices for finite impulse response (FIR) filters. In particular, we focus on nearest neighbor factorizations discussed by Wickerhauser and Zhu that allow for efficient implementation of the discrete wavelet transform (DWT) for the …
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High frequency AC power converter for low voltage circuits
… that is suitable for VHF frequency (50-100MHz) polyphase AC/DC power conversion in low voltage integrated circuits. A complete AC power delivery architecture was evaluated demonstrating the benefits of delivering power across the interconnect at high voltage and lower current with on- or …
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On the Use of Uncalibrated Digital Phased Arrays for Blind Signal Separation for Interference Removal in Congested Spectral Bands
… into orthogonal narrow-band partitions using a polyphase filter-bank channelizer, and a rank-reduced version of the received matrix on each sub-channel is computed through reconstruction by retaining a subset of its singular values. The wideband spectrum is synthesized through a near-perfect …
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Radio frequency direct-digital QPSK modulators in CMOS technology
… balanced signals, which are then fed to a 90° RC polyphase network generating all four differential quadrature signals. Voltage-controlled NMOS resistors are used in the RC polyphase network to fine-tune it after fabrication for the lowest possible phase error. Finally, only one of the four …
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