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 51 for “"Down-time"”.
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Slowing Down Time: studies on spatial time
The experience of time is not fixed by a rigid mathematical measure, instead, it flows at vaying rates. There are certain occasions in which we would like to extend time with all our force, up to the limit of our stretched arms and further. Conversely there are moments which we'd like to last no …
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A first step towards zero down time: the creation of synergy through equipment acquisition within the constraints of a small budget in an Army with civilian oversight - a case of the Botswana Defense Force (BDF)
… null hypothesis, Ho, for this thesis is that: Downtime or turnaround time (TAT) cannot be reduced by favorable independent variables. This follows from the preliminary conclusion that there is substantial downtime as at present. It postulates that something can be done to ameliorate past …
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The Design, development, and analysis of a wearable, multi-modal information presentation device to aid astronauts in obstacle avoidance during surface exploration
… capture space. Metrics included completion time, subjective workload, head-down time, collisions, as well as gait parameters. The primary measures of performance were collision frequency and head-down time, as these both must be minimized in an operational environment. Results indicate that …
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Test scheduling and configuration in a self-repairing computer
… configuration, (2) very little computational down-time" results from testing, and (3) the parallel testing procedure does not initiate reconfiguration of the computational configuration.
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A Monte Carlo analysis of neutron thermalization in graphite
… is to be used as a pulsed neutron source. The time dependence of neutron flux, energy spectrum as a function of time, and various reactor parameters such as Fermi Age, slowing dotm time, and diffusion length in graphite will be measured using the pulsed source method. This thesis is a Monte …
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Impeding efficiency
… that impedes efficiency, hinders mobility, slows down time and allows for personal interpretation of the build environment.
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Study and analysis of value stream for Yesco production
… stream map for different work orders from the time the work order is distributed by the department of layout to the time the finished product is ready to crate. Also, we will analyze production sequences, cycle time, labor time, lead-time and down time for each step of the production process. …
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Automatic calibration of modulated fractional-N frequency synthesizers
… the need for production calibration and periodic down time for calibration cycles.
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A suction-based reversible attachment and locomotion mechanism for an underway vessel hull cleaning and inspection robot
… the items that are traded globally. Any vessel down time brings significant additional costs to the industry. A common source of vessel downtime is the colonization of the vessel hull by marine life, known as permanent marine bio growth. Marine bio growth brings significant risks and costs …
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Fuzzy logic-based fault diagnosis for mining equipment failures
… many mines and processing plants. Machine breakdowns are not only expensive in terms of production losses but also important in meeting production schedules. In a complex piece of machinery like a shearer or a powered support system in a highly automated longwall face, such breakdowns can be due …
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Lubricant oil consumption effects on diesel exhaust ash emissions using a sulfur dioxide trace technique and thermogravimetry
… in this process clogs filters requiring engine down time and additional cleaning expenses. Recent reductions in fuel Sulfur and ash levels have also made lubricant consumption a significant relative contributor to particulate and ash generation. The goal of this study, a detailed understanding …
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Evaluation of Package Delivery Truck Drivers: Task Analysis and Development/Validation of an Objective Visual Behavior Measure to Assess Performance
… wheel. This information demonstrated that breakdowns were occurring within the tasks drivers were performing and that improved methods of training and evaluations may be needed as a result. A construct of visual behavior called Head Down Time (HTD) was then created and tested. An individual HDT …
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Nondestructive evaluation of wooden logs using ground penetrating radar
… detecting the subsurface defects in logs in real time. Internal defects such as knots, decays, and embedded metals are of greatest concern for lumber production. While defects such as knots and decays (rots) are of major concern related to productivity and yield of high value wood products, …
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A Doppler Radar Lock-in Demodulation Algorithm for Machine Vibration Sensing
… that provides non-contact, inexpensive real-time data collection without necessitating line-down time. Conventional Fast Fourier Transformation based vibration analysis requires large amounts of data to achieve high spectral resolution necessary for fault detection especially with radio …
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The impact of conventional and wide bandgap semiconductor PWM inverter EDM bearing currents on motor bearings.
… issues due to faster dv/dt device turn on/off times and relatively higher switching frequencies for the same device cooling requirements as conventional silicon (Si) devices. A key issue produced by these PWM motor drives is premature bearing failure due to an increase in vibration from the …
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Dynamic Performance of Turbocharger Rotor-Bearing Systems
… losses within the bearings. A study of run-down times after the pressurized air supply was removed indicated that the BBT has significantly lower frictional losses under all operating conditions tested with an average increase in run-down time of 14.1%.
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Thermal helium buildup and control in a fusing tokamak
… ash level (or maximum fusion power) is several times larger than the fast alpha slowing down time for the ARIES-I type driven plasma. With sawtooth period $\sim$5 seconds and helium transport selectively enhanced by an order of magnitude, the fusion power increases $\sim$30% compared to the case …
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Percutaneous Puncture of Flexor Sheath Ganglions: An Assessment of Recurrence
… Percutaneous puncture can be performed at the time of the initial consult and an immediate return to normal activity with no down-time for the patient. The aim of this study is to assess the recurrence rate after percutaneous puncture. We also describe our employed technique. Method The …
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Negative Temperature Programming using Microwave Gas Chromatography
… isotherms as high as 450 degree, and 1 min cool-down times from 300 to 50 degree can be achieved. In conventional GC, only positive temperature programming is used because the oven cools down slowly due to the great thermal mass of the oven. Short cool-down time in microwave-heating GC makes it …
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Analysis And Design Of A Modular Solar-fed Fault-tolerant Power System With Maximum Power Point Tracking
… digital controller is setup to locate it in real time while optimizing other operating parameters. This control scheme can increase the energy yield of the system by up to 45%, and thus significantly reduces the size and weight of the designed system. The modularity of the system makes it easy to …
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