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.
Results
Showing 1 to 17 of 17 for “"Protection Device"”.
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Hearing protection in mines : evaluating the Noise Clipper® custom made hearing protection device
… of the Noise Clipper® custom-made hearing protection device and the comfort levels it afford are unknown. Furthermore, research in hearing conservation is seldom focused on the critical/biological thresholds for temporary threshold shift. Field studies on hearing protection devices have …
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Nonlinear Dynamic Analysis of Structures with Hyperelastic Devices
… of hyperelastic bracing as a seismic protection device. Hyperelastic braces incorporate a new idea of a nonlinear elastic material that gains stiffness as the brace deforms. Structural behaviors of particular concern for an MDOF frame are stability, residual displacement, base shear, …
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High current pulse characterization of semiconductor devices
… decaying falling edge. When applied to an ESD protection device, the pulse shape allows for capture of both the transient and quasi-steady-state responses, in the context of a single measurement. EETLP provides unprecedented insight into the turn-off dynamics of snapback-type devices. Device …
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Liar's Domination in Grid Graphs
… liar's domination provides a way of modeling protection devices where one may be faulty. Assume each vertex of a graph <em>G</em> is the possible location for an intruder such as a thief. A protection device at a vertex <em>v</em> is assumed to be able to detect the intruder at any vertex in …
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Two-Dimensional Vibrations of Inflated Geosynthetic Tubes Resting on a Rigid or Deformable Foundation
… the potential to replace the traditional flood protection device of sandbagging. These tubes are manufactured with many individual designs and configurations. A small number of studies have been conducted on the geosynthetic tubes as water barriers. Within these studies, none have discussed the …
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A model-based alarm processor for the assessment of protection systems performance
… of electrical components, combined with protection equipment in place to ensure expensive assets are protected from damage. Attempting to effectively manage the sheer volume of electrical plant becomes an impossible task without remote monitoring and automated analysis of the huge volumes …
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The Detection of Warning Signals While Wearing Active Noise Reduction and Passive Hearing Protection Devices
… wore an active noise reduction (ANR) hearing protection device (HPD), a passive HPD, or no HPD. An ANR earmuff, a passive earmuff, and a user-molded foam earplug were tested in two types of noises (pink and red) at two different noise levels (85 dBA and 100 dBA). The signal used was an …
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Hot spot detection and protection methods for photovoltaic systems
… This work focuses on adding detection and protection to PV systems for a temporary fault called hot spotting that occurs in series-connected PV cells. The present-day solution to mitigate hot spotting is the use of bypass diodes over subpanel PV strings. Simulation and experimental results …
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Psychophysical investigation of the real-ear attenuation of hearing protection devices under different sound-field diffusivity conditions
… consensus standards governing hearing protection device (HPD) attenuation testing specify the use of a diffuse sound field to ensure the sound field remains uniform and random-incidence in an envelope about the subject’s head (ANSI, 1974; ANSI, 1984; British BSI 5108:1983; Canadian CSA …
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Comparison of laboratory protocols for yielding improved estimates of hearing protection in field performance for use in standards development
Federal law requires hearing protection device (HPD) manufacturers to provide attenuation ratings for use in estimating workers’ protection levels. These ratings, which are laboratory obtained, typically overestimate the actual protection levels achieved in the workplace. This research investigated …
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An inter-laboratory investigation of ANSI standard fitting protocols, sample size, subject and experimenter gender, and trial on the real-ear attenuation of two types of earplugs
… differences of using two different hearing protection device (HPD) fitting procedures for testing the real-ear attenuation at threshold (REAT) of a popular vinyl foam earplug and a multi-sized premolded PVC single-flanged earplug. The first fitting procedure tested in the experiment is …
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Design and development of side underride protection devices (SUPD) for heavy vehicles
… This research aims to develop side underride protection devices (SUPD) to eliminate the incompatibility between the small vehicle’s bumper and bottom of the trailer or box of the straight truck. To successfully design these guards, a regulation for testing the effectiveness of the SUPDs during …
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A Modelling Framework for Lightning-Induced Common-Mode Currents in Photovoltaic Modules and Small Arrays
… Additionally, a novel wideband model for a surge protection device (SPD) was developed by incorporating previously neglected resistive elements, improving its representation in both the frequency and time domains. Time-domain simulations incorporating the adapted SPD model and a simplified …
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Predictive transient circuit simulations of charged device model ESD events in system in package chips
… simulate the voltage stress experienced by the devices on integrated circuit components stressed by the charged device model (CDM) electro-static discharge (ESD) testers. The thesis presents a simple package modeling methodology that can be used to create a distributed model to simulate the …
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Control Hierarchies for Critical Infrastructures in Smart Grid Using Reinforcement Learning and Metaheuristic Optimization
… control of power flows, voltage regulators, and protection device settings of the online resources in the system. This can be achieved with the help of an active distribution network, equipped with a distribution management system that provides online solutions to control problems, in real-time, …
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The impact of voltage unbalance and regulation on the life expectancy of LV induction machines
… algorithm and be implemented in microprocessor devices which enhance the level of accuracy and flexibility. As a practical application of the thermal model real time data can be processed according to the firmware thermal algorithm program and results are compared with the expected values and …
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Der Einfluss von Plaquemorphologie und anderen prädiktiven Faktoren auf das Auftreten von Mikroembolien während der Stentgeschützten Perkutanen Angioplastie der Karotiden (SPAC)
Hintergrund: Zerebrale mikroembolische Läsionen sind die häufigsten Komplikationen der Stentgeschützten Perkutanen Angioplastie der Karotiden (SPAC). Diese gelten als Folge thrombembolischer Abscheidungen aus der Karotisplaque während der Intervention. Plaquezusammensetzung und morphologie spielen …