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 46 for “"Area measurement"”.
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Children's Understanding of the Concepts of Area Measurement
… enriched curriculum that connected geometry with area measurement to enhance children's understanding of the concepts of area measurement. One hundred and twenty fourth-grade Taiwanese children from a public school participated in the study. The results reveal that the group who received the …
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Automatic 3D surface area measurement for vitiligo lesions
… stress. Monitoring changes in vitiligo lesion area allows assessment of treatment efficacy and aids in clinical decision making. Currently existing approaches for vitiligo lesion measurement are either inefficient or inaccurate. Using a RGB-D camera (Kinect) and imaging processing techniques, …
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Internet-based Wide Area Measurement Applications in Deregulated Power Systems
… the United States now is in the wholesale market area, however, the retail market is still undergoing changes. Deregulation has many impacts on power system network operation and control. The number of power transactions among the utilities has increased and many Independent Power Producers (IPPs) …
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Wide Area Measurement Applications for Improvement of Power System Protection
… outages. With the advancement of Wide Area Measurement Systems (WAMS), it is now possible to redesign network protection schemes to make them more adaptive and thus improve the security of the system. Often flagged for exacerbating the events leading to a blackout, the back-up distance …
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Improving the precision of leg ulcer area measurement with active contour models.
… to be in excess of £300M annually.<br/><br/>Measurement of the size of leg ulcers is a guide to assessing the progress of wound healing, and the use of non-invasive measurement techniques avoids damaging or infecting the wound. The area of a leg ulcer is currently measured by presenting a …
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Comparison of GPS Point Selection Methods for GIS Area Measurement of Small Jurisdictional Wetlands
… of impacts to wetlands at one-half acre. Impact area can be determined by Global Positioning System (GPS) measurement of wetland boundary and Geographic Information System (GIS) calculation of impact area. GPS point selection methods include (1) equal time interval, (2) transect and (3) …
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Nickel-based superalloy operating temperature determination via analysis of gamma/gamma' microstructure and coating/base material interdiffusion
… was measured by point counting and direct area measurement. The data, however, were found inadequate to accurately determine the operating temperature. The interdiffusion between the platinum aluminide coating and the base material was modeled with an error function solution to Fick's …
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The Role of Carbonaceous Materials in Pavement Dust, Soils, and Lake Sediments on the Fate of Organic Pollutants in Small Urban Watersheds
… infrared spectroscopy, specific surface area measurement, and solid state 13C nuclear magnetic resonance spectroscopy. Sorption isotherms of phenanthrene to these fractions and bulk samples fitted with Freundlich models are nearly linear (N = 0.90--1.00), suggesting a …
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The Frequency Monitor Network (FNET) Design and Situation Awareness Algorithm Development
Wide Area Measurements (WAMs) have been widely used in the energy management system (EMS) of power system for monitoring, operation and control. In recent years, the advent of synchronized Phasor Measurements Unit (PMU) has added another dimension to the field of wide-area measurement. However, the …
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Performance Characterization of Ceramic Matrix Composites through Uniaxial Monotonic Tensile Testing
… verification was carried out through alignment measurement with a gaged tensile specimen using ASTM E1012 to ensure the monotonic nature of the testing equipment. Tensile strength data was treated with Weibull statistical models to produce A and B-basis strength properties for design values.</p> …
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Telecommunications for a deregulated power industry
… that are available for utilities today. Phasor measurement units (PMUs) are analyzed in detail and communication delays due to the use of PMUs in wide area measurement systems (WAMS) are also studied. The highlight of this thesis is a close look at the characteristics of the power line channel …
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The Virginia Tech Phasor Data Concentrator Analysis & Testing System
… of Smart Grid and an increased emphasis on Wide Area Measurement, Automation, Protection and Control (WAMPAC) has lead to the substantial increase in the development and use of Synchrophasor Systems. The Department of Energy having realized its importance in the Power System has encouraged its …
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A Centralized Wide Area Control of FACTS for Damping Power System Inter-Area Oscillations
… (FACTS) control for damping power system inter-area oscillations is a topic of much interest. However, local decentralized FACTS controllers are either too complicated to be realizable or do not offer satisfactory performance under various system operating conditions. This research develops a …
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Exactitude et précision de la mesure de superficie de parcelle de culture
… a number of important reasons for determining areas: natural resource valorisation and protection, environmental management or others works. But what is a data quality? Accuracy is characterised by systematic errors and mistakes. When these errors are eliminated, the standard deviation …
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Two-Stage Fault Location Detection Using PMU Voltage Measurements in Transmission Networks
… reliability [1]. With the development of Wide Area Measurement System (WAMS) and Phasor Measurement Unit (PMU), various fault location algorithms have been proposed. The purpose of this work is to determine, modify and test the most appropriate fault location method which can be implemented …
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Continuous and non-invasive blood pressure monitoring using ultrasonic methods
… diseases. Although an invasive ABP measurement through arterial catheterization performed in an intensive care unit (ICU) is considered a gold standard, its invasive nature not only increases various patients' risks but makes its usage for cardiovascular studies expensive. Therefore, …
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WAMS-based Intelligent Load Shedding Scheme for Preventing Cascading Blackouts
… event by monitoring the tie lines of a control area using Wide Area Measurement Systems (WAMS) and initiates load shedding by removing loads whose locations are optimally determined by a sensitivity analysis. The amount and location of the load shedding depends on the location and size of the …
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Synthèse de nanoparticules de carbure de fer dans un réacteur à plasma inductif
… Analysis (TGA), and specific surface area measurement using BET method. XRD results showed that the produced powder has about 50% of iron carbide alongside other phases such as pure iron, austenite and graphite. SEM and TEM images revealed that nanometric particles with a diameter …
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Identification, Analysis, and Control of Power System Events Using Wide-Area Frequency Measurements
… introspection. Only recently have dynamic, wide-area time synchronized grid measurements brought to light the complex relationships between large machines thousands of miles apart. These measurements are invaluable to understanding the health of the system in real time, for disturbances to the …
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