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 390 for “"Leak"”.
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Memory leak Masking Using Dual Heap Organization
… measured the ability of each method to detect leaks generate false positives and false negatives. In comparison, the dual heap implementation showed a relatively better performance than the aging algorithm. The dual heap implementation is shown to produce less false positives and less false …
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Anastomotic leak after esophagectomy: Towards evidence-based treatment
Contains fulltext : 304138.pdf (Publisher’s version ) (Open Access)
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The Role of Neuronal Leak Channels in Anesthesia
… sodium (NCA or NALCN) and potassium (K2P) leakchannels that establish the neuronal resting membrane potential (RMP). Usingthe nematode, C. elegans, I tested the effect on anesthetic sensitivity ofcombining these potassium and sodium leak channel mutations in a singleanimal. I also used the …
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Evaluating an experimental setup for pipe leak detection
… life piping system in which to test possible leak detection mechanisms. A model leak detection mechanism is developed which consists of a ring with threads that follow the streamlines of the flow inside the pipes, allowing for a visualization of the flow patterns. Two experiments were …
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Statistical approaches to leak detection for geological sequestration
… it into deep saline aquifers. Detecting leaks to the atmosphere will be important for ensuring safety and effectiveness of storage. However, a standard set of tools for monitoring does not yet exist. The basic problem for leak detection - and eventually for the inverse problem of …
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Predicting Package Defects: Quantification of Critical Leak Size
Threshold leak sizes and leak rates were calculated for a number of liquid food products exhibiting a wide range of surface tension and viscosity values. From this data, one can see that mathematically, under typical pressure differentials generated in food packages (less than or equal to ±34.5 …
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Liner characterisation and leak detection using electrical resistivity techniques
… with an increase in the proximity to the leak point. Furthermore, the resistivity values obtained with water were nearly 10 times the values observed with landfill leachate as the leaching liquid. Based on the resistivity profiles of soil as observed at different time intervals, the method …
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Boiler feed pump low load – leak off recirculation study
… start-up conditions. These plants make use of a leak off or recirculation system that diverts some of the flow back to the feed water tank, ensuring that a minimum flow through the pump is maintained at low load and start-up operating conditions. The recirculation valve, also known as a leak off …
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A reliable & autonomous robotic in-pipe leak detection system
Leaks are the major factor for unaccounted losses in every pipe network around the world (oil, gas or water). In most cases the deleterious effects associated with the occurrence of leaks may present serious economical and health problems. Therefore, leaks must be quickly detected, located and …
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The design of the housing for leak detection device
Small leaks in pipes cause huge losses of water, wasting the energy and money put into cleaning the water and pumping it to the point of the leak. Detecting these small leaks is currently not very accurate or practical to do over an entire system of pipes. A device is being developed which detects …
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Robot design for leak detection in water-pipe systems
Leaks are major problem that occur in the water pipelines all around the world. Several reports indicate loss of around 20 to 30 percent of water in the distribution of water through water pipe systems. Such loss of water represents critical waste of valuable resources, especially in countries such …
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Flexible in-pipe leak detection sensor module design and fabrication
… systems is evident. A robust autonomous in-pipe leak detection robot was developed and reported in [1-5]. The developed system is able to accurately detect leaks in both pressurized gas and water pipes. This however was limited to 101.6mm (4in) internal diameter pipes. In practice, fouling of …
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Smart water network management with in-pipe leak detection robots
… the WDN's pipes to better differentiate pipe leaks from bumps in the pipes. Starting from the unit of the in-pipe leak detection robot, I investigated ways to make its soft leak sensors able to differentiate between pulling (due to leaks) and bending (due to bumps), and showed how a new design …
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Determination of the Leak Size Critical to Package Sterility Maintenance
… mechanism by which a package defect becomes a leak; and the imposed pressures generated within a package during distribution; comparison of the threshold leak size to the critical leak size and their effect on loss of package sterility; and the relationships between microorganism …
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A leak detecting technique utilizing an abrupt and large pressure drop
… long distances, but damage to the pipes, such as leaks, can cause considerable losses. The difficulty in detecting these leaks prompted this work, which attempts to find a reliable method of recognizing a leak and suggest possible designs that could be implemented on a pipe-navigating robot. This …
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Further development of an in-pipe leak detection sensor's mobility platform
Water leakage is a major global problem and smaller sized leaks are difficult to find despite their prevalence in most water distribution systems. Previous attempts to develop a mobility platform for a sensor in use in such a pipe by the MIT Mechatronics lab have been met with less than desirable …
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