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 56 for “"dead time"”.
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Adaptive dead-time compensation
… for poorly modeled plants with significant dead time is proposed. We show how minimum variance control can be interpreted as dead-time compensation with infinite gain proportional feedback. Based on this interpretation, we develop more general control laws that do not suffer from the …
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Dead-Time Compensation and Performance Monitoring in Process Control
The thesis contains two parts, dead-time compensation and performance monitoring. The first part on dead-time compensation is about robust tuning procedures for dead-time compensating controllers (DTC). Both stable and integrating processes are considered. Simple experiments are performed to obtain …
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Computational Dead Time Correction in Fluorescence Lifetime Imaging Microscopy (FLIM)
<p>Fluorescence Lifetime Imaging Microscopy (FLIM) is a crucial tool in biomedical research. It can visualize and measure molecular interactions and cellular processes by analyzing the fluorescence decay of molecules in biological samples. Unlike traditional imaging methods based on fluorescence …
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Dead time and count loss determination for radiation detection systems in high count rate applications
<p>"This research is focused on dead time and the subsequent count loss estimation in radiation detection systems. The dead time is the minimum amount of time required between two events to permit detection of those events individually by a radiation detection system. If events occur during the …
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Design of a step-down DC-DC controller integrated circuit with adaptive dead-time control
… circuit has been designed with adaptive dead-time control. The adaptive dead-time control circuitry is implemented as digital delay-locked loop with digital counters as memory elements. In periodic steady state, the switch is controlled to turn on exactly when the body diode starts to …
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A Statistical Approach to Automatic Process Control (regulation schemes)
… Application of techniques from the fields of time series analysis and stochastic control to tackle product quality control problems is also common. The focus of this thesis is on the issues of process delay ('dead time') and dynamics ('inertia') which provides opportunity to utilise …
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High-frequency Quasi-square-wave Flyback Regulator
… key parameters including magnetizing inductance, dead time, input voltage and output power on the small-signal behavior can be analyzed. The closed-loop bandwidth can be pushed much higher with this modified model, and the transient performance is significantly improved. With the traditional fix …
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Efficiency improvement in nanometre CMOS outphasing power amplifiers
… for greater mobile data rates and battery lifetimes. The outphasing transmitter is one such technique that warrants research as it has yet to achieve commercial viability. It operates by decomposing a modulated signal into two constant-amplitude signals with a phase difference corresponding to …
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Point process models for discharge patterns of single units in the lateral superior olive of the cat
… In our model, the duration of the absolute dead time of one interval is inversely related to the duration of the previous interval. Superposition of renewal processes with a dead time implemented is shown to lack the necessary serial dependence which would qualify it as a potential model for …
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Direct and Indirect Searches for Anomalous Beta Decay
We present a treatment of time-varying nuclear transition rates intended to guide future experimental searches, focusing primarily on the concept of ``self--induce decay.'' This investigation stems from a series of recent reports that suggest that the decay rates of several isotopes may have been …
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Simultaneous multislice spiral and EPI chemical shift imaging
… for MR Spectroscopy Imaging (MRSI) include long dead times in each TR. This dead time is necessary for magnetization moments' longitudinal relaxation, and so a good SNR efficiency. The fact that SNR is one of the dominant challenges that MRSI faces makes it an expensive tradeoff to decrease the …
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AUTOMATIC TUNING OF PROCESS CONTROLLERS : PRACTICAL APPROACHES
… a first or second order transfer function plus dead time. With the auto-tuning method, the formulas give reasonably accurate gain margin and phase margin with respect to the specifications for a wide range of process dynamics. The same method is extended to processes with integration. A …
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Derivation of Parabolic Current Control with High Precision, Fast Convergence and Extended Voltage Control Application
… current control has some limitations, such as dead-time effects, only working as bipolar PWM, complex hardware implementation, non-ideal converging speed. These problems are respectively solved in this dissertation and solutions include dead-time compensation, the implementation on dual-carrier …
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Thorium-based mixed oxide fuel in a pressurized water reactor: A feasibility analysis with MCNP
… disposition. Both non-paralyzing and paralyzing dead-time calculations were performed for the Portable Spectroscopic Fast Neutron Probe (N-Probe), which can be used for spent fuel interrogation. Also, a Canberra <sup>3</sup>He neutron detector's dead-time was estimated using a combination of …
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Effect of column temperature on elution order in gas chromatography
… confirmed by two methods : comparing retention times, and spiking the sample. The results of an investigation for accurately determining the dead time is also presented. The experimental results of using 10% methane in helium and the results of a theoretical model based on Poiseuille's equation …
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Applied Control Strategies at a Cogeneration Plant
… structure</p> <p>2) The First Order Plus Dead Time (FOPDT) process model</p> <p>3) The Internal Model Control (IMC) correlations for PI controller tuning</p> <p>4) Static feed forward with feedback trim</p> <p>5) Cascade Control</p>
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High Efficiency Optimization of LLC Resonant Converter for Wide Load Range
… efficiency and power density. Due to the hold-up time requirement, PWM DC/DC converters cannot achieve high efficiency for well known reasons when they are designed for wide input voltage range. As a promising topology for this application, LLC resonant converters can achieve both high efficiency …
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Development of the Advanced Emitter Turn-Off (ETO) Thyristor
… A novel integrated method to eliminate the dead-time requirement is proposed for ETO. This method not only improves the output waveform quality but also increases the reliability and reduces the cost of the high power PWM voltage source converters. With this unique function, the upper and …
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Optical quantum random number generation: applications of single-photon event timing
… and characterization of two photon-arrival-time quantum random number generators (QRNGs). After the QRNGs were completed, it was realized that their performance was severely limited both by the maximum detection rate of the single-photon detectors used, and the precision at which the arrival …
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The Determination of the Half-Life of Si-32 and Time Varying Nuclear Decay
… the last $\sim 2$ yr, while recording $\sim 5\times 10^6$ individual environmental readings. The half-life of $^{32}$Si, which has been quoted between 101(18) yr and 330(40) yr, is redetermined by this data to be $159.4\textrm{ yr} \pm 1.9\textrm{ yr (statistical)} \pm 3.7\textrm{ yr …
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