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 16 of 16 for “"Leakage rate"”.
-
Performance evaluation of mechanically attached roofing systems
… loads on the roof system and, second, an accurate estimation of the system response to the induced wind loads. The present study contributes to an ongoing research project at the National Research Council Canada in the evaluation of Mechanically Attached Roofing Systems (MAS) for wind uplift …
-
Optimum time to refurbish a boiler feed pump at Eskom's power stations
… to these changes and specifically the change in leakage rate and friction in the annular seals of the impellers and axial thrust balancing devices.
-
Air leakage in underground mine ventilation
Air leakage in underground mines is the most common cause of inefficient distribution of ventilating air. Depending upon various factors, more than half of the fresh air entering a mine short-circuits to the return airways before reaching the working faces. Consequently, large leakages create an …
-
Effect of Vertebroplasty with Bone Filler Device and Comparison with Balloon Kyphoplasty
… differed significantly (p < 0.05). Bone cement leakage rates did not differ (p < 0.05). Bone cement distribution was spongy type in the majority of the vertebroplasty group (94.5%), but only spongy type in 42.0% of the kyphoplasty group. High bone densitometry (BMD) readings and long period from …
-
Subsurface methane migration from natural gas distribution pipelines as affected by soil heterogeneity: field scale experimental and numerical study
… pipelines are becoming more widespread. Pipeline leakage can be catastrophic when flammable mixtures of methane and air accumulate and ignite. Methane is additionally a powerful greenhouse gas thus; leakage also poses adverse climate impacts. What is not well understood in leakage incidents is how …
-
A MEMS valve for the MIT Microengine
… testing results using nitrogen have demonstrated repeatable valve functions and choked flow characteristics. MIT has initiated a project to build a micro-scale gas turbine generator for high power density output in applications such as portable power source or micro air vehicles. For …
-
Tools for managing intermittent water supplies
… the distributed water than continuously-operated (or '24x7') water supplies. In addition, IWS may not provide customers with enough water. Improving the safety and sufficiency of IWS requires new management tools. This thesis proposes some such tools. Specifically, this thesis develops a …
-
Evaluating the Infrastructure Requirements of a Low-Carbon Hydrogen Supply Chain in Germany and theGulf Coast
… many governments to unveil national hydrogen strategies. Hydrogen is viewed as a potential enabler of deep decarbonization, notably in hard-to-abate sectors such as the industry. A novel optimal low-carbon hydrogen network algorithm was developed to assess the supply chain requirements of …
-
Herstellung von dünnen Elektrolytschichten mittels Laserablation und Kathodenzerstäubung für Hochtemperatur-Brennstoffzellen
Solid oxide fuel cells (SOFCs) are presently operated at temperatures between 800 and 1000°C. Lowering the operation temperature to 600°C at unchanged power density would increase the durability of the fuel cell stack. Alternative electrolyte materials with a higher electric conductivity and …
-
Leakage Characterisation in Bulk Pipes using Pressure Tests
… of this resource is, however, lost through leakage. Not only does this result in a waste of a precious resource, but it also leads to a direct loss of revenue, especially considering that value has been added to the leaking water through collection, storing, purifying and pumping. A great …
-
Contribution to the Characterization of Piston Expanders for Their Use in Small-scale Power Production Systems
… expected. The identified reasons are a too high leakage rate, a too large cut-off ratio and a too low expander supply temperature. These three features led to insufficient pressure. Nevertheless, a compressor is used to rise the pressure up to 7 bar in order to test the expander part. This …
-
Nonparametric Anomaly Detection and Secure Communication
… guaranteed secure communication with vanishing leakage rate at eavesdroppers.</p> <p>First, the anomaly detection problem is investigated, in which typical and anomalous patterns (i.e., distributions that generate data) are unknown \emph{a priori}. Two types of problems are investigated. The …
-
A proteomic approach to investigate the response of tef (Eragrostis tef) to drought
… using relative water content (RWC), electrolyte leakage and chlorophyll fluorescence measurements, to establish critical water content stages for investigation of changes to the tef proteome in response to dehydration stress. Physiological testing showed tef viability to be retained to 30% RWC, …
-
Modeling CO₂ leakage from geological storage formation and reducing the associated risk
… and faults, which can act as pathways for leakage of stored CO₂ Modeling the flux of CO₂ along a leaky pathway requires transport properties along the pathway. We provide an approach based on the analogy between the leakage pathway in wells that exhibit sustained casing pressure (SCP) and …
-
Effects of ultrasonication in combination with selected sanitizer and surfactant on the quality and microbial safety of produce
… the development of more effective sanitization strategies and better sanitizers. Specifically, the effects of a new sanitization strategy and a set of sanitation combinations on reduction of microorganisms on produce, as well as the potential impact of these treatments on produce quality, were …
-
Design and applications of smart antenna systems for wireless networks in the context of the Internet of Things (IOT)
… on a waveguide structure which allows the leakage of part of the power along the structure. For this reason, the radiation of the antenna is produced by the leakage of power. In order to produce coherent radiation, it is necessary to control this leakage rate along the radiating structure. …