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 59 for “"Phase locking"”.
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LOCSET phase locking : operation, diagnostics, and applications
… and experimental work recently done with the Locking of Optical Coherence via Single-detector Electronic-frequency Tagging (LOCSET) phase locking technique developed and employed here are AFRL. The primary objectives of this effort are to detail the fundamental operation of the LOCSET phase …
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Improved HVdc dynamic performace via phase locking to virtual Thévenin voltage
An impedance-compensated phase-locked loop (IC-PLL) that synchronizes the input signal to a virtual estimate of ac network Thévenin equivalent voltage is introduced and evaluated for application in HVdc systems. As compared with the conventional Trans-vector PLL method, it is shown that the …
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Phase-locking terahertz quantum cascade lasers for high dynamic range heterodyne imaging
… a combination of heterodyne detection and a phase-locked loop to selectively lower the system noise floor while preserving signal power. In this thesis, an optical phase-locked loop using a Schottky diode mixer and 3rd order DFB QCLs is implemented to achieve a maximum SNR of 60 dB, limited …
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Selp-phase locking in a type-II phase matched optical parametric oscillator
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Dynamics of phase locking in neuronal networks in the presence of synaptic plasticity
… generated by neuronal networks depends on the phase relationships of its individual neurons. Observed phases result from the combined effects of individual cells and synaptic connections whose properties change dynamically. The properties of individual cells and synapses can often be …
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Optical frequency division by 3 employing self-phase-locking in periodically poled lithium niobate
… applications. The divider is based on a self- phase locked optical parametric oscillation in a doubly resonant semi-monolithic optical cavity containing a dual-grating periodically poled lithium niobate. The design, implementation and evaluation of such a frequency divider are described. …
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Frequency and phase locking of a CW magnetron : with a digital phase locked loop using pushing characteristics
… in this thesis is precise frequency and phase control of a 1.2 kW CW cooker magnetron (National 2M137) locked to a 10 MHz reference injected with a very small RF signal (of the order of -40 dBc) creating a suitable RF source for particle accelerators and other sophisticated applications. …
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Temporal dynamics of MEG phase information during speech perception: Segmentation and neural communication using mutual information and phase locking
… Recent evidence suggests that low frequency phase information in the delta and theta bands of the Magnetoencephalography (MEG) signal plays an important role for tracking and segmenting the incoming signal into units of analysis. This thesis utilized a novel method of analysis, Mutual …
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Performance of Concurrency Control Methods in Distributed Database Management Systems (Timestamp Ordering, Two-Phase Locking, Optimistic Scheme, Restart, Transaction Blocking)
… (BTO), Basic Optimistic scheme (BOPT), Basic Two-Phase Locking (B2PL), and Conservative Timestamp Ordering (CoTO), were developed, and the performances of those CCMs in distributed database management system (DDBMS) were simulated with some care to get statistically significant results. The …
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Performance Study of Two Phase Locking in Single-Site and Distributed Database Systems (Concurrency Control, Queueing Network, Pre-Claim, Ordering)
Two phase locking (2PL) as a concurrency control mechanism (CCM) is studied in the contexts of single-site database systems (SDBSs) and distributed database systems (DDBSs).
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Phase-locking of neurons in the hippocampus and the medial prefrontal cortex of the rat to the hippocampal theta rhythm
… a significant portion of prefrontal neurons are phase-locked to the hippocampal theta rhythm and we compare the phase-locking properties of prefrontal and hippocampal cells. We also show that prefrontal neurons phase-lock best to theta oscillations delayed by approximately 50 ms and confirm this …
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Applications of optical parametric downconversion : I. Self-phase locking, [and] II. Generation of entangled photon pairs in periodically-poled lithium niobate
… nonlinear interactions through the use of quasi-phase matching, have increased the flexibility and performance of many nonlinear optical devices. One of the devices presented in this thesis is a 2:1 frequency divider based on self-phase locking in a type-II phase matched optical parametric …
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Time-varying phase relationship between spiking neuronal responses and local field potentials in olfactory processing in manduca sexta
… to local field potential (LFP) oscillation phase. Using the sphinx moth, Manduca sexta, as a model system, we tested the predictions of the TOM with regard to the trial-to-trial consistency of odor driven oscillations, the phase-locking of action potentials to LFP oscillations, and the role …
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Predicting lateralization performance at high frequencies from auditory-nerve spike timing
… psychoacoustics and computational models. Phase locking of auditory-nerve fibers in anesthetized cats was characterized using both the synchronization index and autocorrelograms. With both measures, phase locking is stronger for PT than TS, and for TS than for SAM tones. Phase locking to …
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Circadian and Multi-day Rhythms in Generalized Tonic-Clonic Seizure: A Probabilistic Approach
… have discovered that seizure occurrences are phase-locking to subject-specific circadian and multi-day rhythms in human physiological signals. Also, various types of epilepsy have distinctive timing patterns with respect to sleep-wake cycles. However, it remains inconclusive how sleep …
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Formal verification of analog and mixed signal circuits using deductive and bounded approaches
… Two techniques to verify the inevitability of phase locking in a Charge Pump Phase Lock Loop (PLL) circuit are presented: mixed deductivebounded and deductive-only verification approaches. The deductive-bounded approach uses Lyapunov-like certificates with bounded advection of sets to verify …
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Models of entrainment of human walking
… the observation of dynamic entrainment and phase-locking to external mechanical perturbations applied at the ankle. Simple models have been developed in attempts to understand these behaviors, but have been unsuccessful at replicating experimental studies. In this manuscript, an energy-based …
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Towards Advanced Photonic Integrated Systems Through Electronic-Assisted Design
… the low-latency, low-parasitic, and on-chip phase coherence of the PIC to address a few of the existing challenges through system-level electronic-photonic co-design. First, 40 Gb/s optical receiver for intensity modulation direct detection (IM/DD) optical links with a cost-effective …
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GoTxn: Verifying a Crash-Safe, Concurrent Transaction System
… of the write-ahead log and the automatic two-phase locking interface used to enforce crash and concurrent atomicity in transactions, detailing how the verification framework Perennial can be used to manage assertions about crash behavior across multiple threads. By effectively harnessing …
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No tDCS Augmented Working Memory Training Benefit in Undergraduates Rewarded with Course Credit
… frontal and/or parietal regions enhanced theta phase locking, reduced alpha power, and strengthened theta-gamma phase amplitude coupling. Objective: To determine whether tDCS to frontal or parietal sites optimized WM training gains we pre-registered a tDCS-WM training study. Methods: 80 …
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