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 19 of 19 for “"transient signals"”.
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Parameter recovery for transient signals
Transient signals naturally arise in numerous disciplines for which the decay rates and amplitudes carry some informational significance. Even when the decay rates are known, solving for the amplitudes results in an ill-conditioned formulation. Transient signals in the presence of noise are further …
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Optimal filters for deconvolution of transient signals in the presence of noise
… methods for the deconvolution of time domain signals. The techniques developed in this work are frequency domain filtering techniques. and are suitable for the type of deconvolution problems encountered in time domain reflectometry (TOR). They include a smoothing technique that is a variant of …
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SEARCH FOR GAMMA-RAY COUNTERPARTS OF GRAVITATIONAL WAVE EVENTS AND OTHER TRANSIENT SIGNALS WITH HAWC
… characteristics make it well suited to look for transient events correlated with other astronomical messengers. In this work we present a maximum likelihood analysis framework developed to search and analyze signals in HAWC data of arbitrary timescales. We apply this method to search for …
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Lateralized Temporal Integration Properties of the Mouse Auditory Cortex
… calls are fleeting, rapidly modulating signals and the ability of the auditory system to perceive such transient signals is a remarkable phenomenon. The mechanism by which the auditory cortex (ACx) is believed to be capable of processing these signals is through recurrent connectivity in …
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Quantitative analysis of the receptor-induced apoptotic decision network
… Cell decisions can be triggered by subtle, transient signals that are context specific, making them hard to study by conventional experimental methods. In this thesis, we use a systems approach combining quantitative experiments with computational modeling and analysis to understand the …
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The Reassigned Bandwidth-Enhanced Method of Additive Synthesis
… additive sound model capable of representing transient sounds and sounds having significant nonsinusoidal energy. We represent sounds as a collection of bandwidth-enhanced partials having sinusoidal and noise-like characteristics. Partials are defined by a trio of synchronized breakpoint …
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Transient signal detection using GPS position time series
… with millimeter-level accuracy and have revealed transient deformations on various spatial and temporal scales. However, the transient deformation may not be easily identified from the position time series because of low signal-to-noise ratios (SNR), correlated noise in space and time and large …
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Feature extraction and knowledge discovery in process operation analysis
… components: (1) feature extraction from dynamic transient signals using multiscale wavelet transform; (2) operational state identification using unsupervised and recursive learning methods; and (3) automatic extraction of knowledge rules from process operational data and embedding of the …
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The relationship between precipitation and electromagnetic signals in the Schumann resonances
Electromagnetic background and transient signals caused by global lightning activity are continuously recorded in the Schumann resonance band (3-120 Hz) from the MIT Schumann resonance site in West Greenwich, Rhode Island. These measurements are compared with precipitation estimates provided by the …
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Courting Serendipity: The Search for Transient Radio Signals
The transient radio sky remains a frontier of observational astronomy, not for lack of scientific promise, but for practical obstacles: terrestrial radio frequency interference (RFI) and limited computing power. Today, a confluence of new RFI mitigation techniques and computing power makes a …
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Fiber Optic Sensors for Liquid Identifications
… optical fiber tip sensors and monitored the time-transient responses of the evaporating droplets. Inspired by the evaporation dynamics of liquids, we employed machine learning techniques to efficiently extract valuable information from the evaporation time-transient signals of liquid pendant …
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An exploration of chemical agents detection using the quantum fingerprint [superscript TM] technology
… as charge traps which can be excited and the transient signals associated with their relaxation examined. A Charge-based Deep Level Transient Spectroscopy (Q-DLTS) system has been used to characterize the deep level states created by surface impurities. In this research, critical components …
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Transient extreme ultraviolet spectroscopy of semiconductors
Transient extreme ultraviolet (XUV) spectroscopy is used to investigate ultrafast photophysics in lead iodide (PbI2) and methylammonium lead iodide perovskite (MAPbI3). Sub-30 fs pulses of XUV light are produced to use as a probe in a tabletop instrument using high-harmonic generation. PbI2 and …
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Inductively coupled plasma mass spectrometry with a twin quadrupole instrument using laser ablation sample introduction and monodisperse dried microparticulate injection
… (10 Hz) and single pulse modes. Steady state signals are highly correlated and the majority of flicker noise cancels when the ratio is calculated. Using a copper sample, the isotope ratio 63Cu+/65Cu+ is measured with a relative standard deviation (RSD) of 0.26%. Transient signals for single …
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Development and implementation of a multi-axial real-time hybrid simulation framework
… for reference tracking of the multivariate transient signals, which should be sufficiently robust to rule out any disturbances and measurement noises in the experimental closed-loop system. Finally, the numerical substructure, compensators, and kinematic transformations are implemented over …
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Unattended acoustic sensor systems for noise monitoring in national parks
Detection and classification of transient acoustic signals is a difficult problem. The problem is often complicated by factors such as the variety of sources that may be encountered, the presence of strong interference and substantial variations in the acoustic environment. Furthermore, for most …
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Investigating Volcano-Tectonic Interactions in the Natron Rift, East Africa with Implications for Understanding Volcanic Eruptive Processes
… communities, tourism, and air traffic. Detecting transient deformation is essential for forecasting eruptions since these signals often precede eruptive events. To detect transient signals using GNSS data from the TZVOLCANO network, we employed the Targeted Projection Operator (TPO) program which …
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Time domain classification of transient RFI
… work may increase the risk of RFI, especially transient RFI. A number of mitigation strategies have been employed, including the use of fixed and mobile RFI monitoring stations. Such stations operate independently of the main telescope arrays and continuously monitor a wide bandwidth in all …
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Searches for Radio Transients using the Long Wavelength Array
… (GPs) from pulsars and search for other radio transients. Using the LWA with a bandwidth of 16 MHz at 39 MHz, we made a 24-hour observation of pulsar radio pulses from PSR B0950+08. The average pulse ux density and pulse width (dominated by "normal" pulses) are consistent with previous studies …