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 20 of 161 for “"Noise Level"”.
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Acoustic and non-acoustic performance of coal bottom ash as sound absorptive material for reducing railway noise level
… CBA in concrete production in reducing railway noise pollution reduce the environmental pollution. This study presents the acoustic and non-acoustic performance for a new concrete product that consists mainly of CBA. Grade 30 MPa concrete was cast with varying replacement percentages (0% to …
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Comparative evaluation of the AES-Chemunex lab blender Smasher®, Seward Stomacher®, Interscience Bagmixer® and Pulsifier® on viable cell counts of foods, noise level, ergonomics, and ease of cleaning
… of viable cell counts/g of ten food types, 2) Noise level of the four instruments ascertained by a) human and b) decibel meter at five feet (1.52 meters) from each instrument, 3) Ease in cleaning the instruments after use, and 4) Ergonomics. Following the ISO Method (7218:2007), 25 g each of …
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The effect of passive and electronic amplitude-sensitive hearing protectors on the detection of a warning signal
… to study earmuff wearers’ signal detection in noise performance and perceptions of comfort and acceptability with two amplitude-sensitive earmuffs as compared to their conventional counterparts. Passive and electronic amplitude-sensitive earmuffs were tested, represented by the EAR Ultra 9000 …
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Model-based prediction of the benefit with rehabilitative hearing devices
… Der erste Nutzen wurde mit dem Acceptable Noise Level Test mit und ohne Störgeräuschreduktion vorhergesagt. Dabei konnte der Einfluss von Störgeräuschreduktionen auf den Acceptable Noise Level zum Teil mit dem Oldenburger Perzeptionsmodel für den Mittelwert der mit Versuchspersonen …
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Development of high-speed P-i-N photodetector for 50Gb/s optical link in data centers
… having the advantage of high bandwidth and low noise level, plays a significant role in the receiver end of optical interconnects. The subject of this work is the design, fabrication, measurement and modeling of high-speed GaAs P-i-N photodiodes operating at 50Gb/s. The material structure and …
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Optimal linear array heading in a directional noise field
… a procedure that optimizes the signal-to-noise ratio (SNR) detected by a linear array in a directional ambient noise field. The SNR can be optimized by minimizing the ambient noise detected by the array. For a given target location, each possible heading of the array centers the ambiguous …
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The effects of hearing protection on speech discrimination in differing noise spectra
… of speech communication issues in industrial noise environments where workers utilize hearing protection devices (HPDs). A controlled empirical study was conducted to determine the effects of several independent variables on speech reception and discrimination including: l). subject's hearing …
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Three essays on financial markets
… model to allow for multiple informed traders, noise in informed traders' private signals and the probability of information events. The first essay's main theoretical findings are: (a) Other than the intuitive effect of incurring loss, noise in private signals may preserve informed traders' …
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Aircraft simulation validation using an instrumental variable approach
… are correlated with only the measured input noise vector. In contrast, the generally used least-squares approach is shown to be correlated with both the state and input noise vectors. Several studies are presented to demonstrate the utility of the validation procedure. These studies include …
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Effects of field of view, MTF shape, and noise upon the perception of image quality and motion
… display characteristics, such as MTF shape, noise, and field of view, have on a display observer's ability to perceive egocentric motion from a display. The third and final objective was to provide a discussion of the use of image quality metrics for the evaluation of displays that are …
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The link between HVAC type and student achievement
… to thermally condition a space impacts the noise level for occupants. Indeed, in schools, air conditioning systems are by far the largest contributors to room noise (Bradley, 2002; Nelson et al., 2005; Siebein et al., 2000). Studies have also demonstrated the impact of noise on youth\'s …
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Ambient noise and surface wave dissipation in the ocean
… waves is responsible for much of the ambient noise level in the ocean. While numerous field measurements have shown a strong correlation between the ambient noise spectrum level (N) in the range 100Hz to 25kHz and wind speed in the ocean, very little has been done to establish a comparable …
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The use of variable spindle speed for vibration control in face milling process
… component wear, and may lead to an unacceptable noise level in the work environment.
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Sensitivity analysis with respect to elastic boundary conditions and laser spatial variables within experimental spatial dynamic modeling
… accurate model, and also to yield a signal-to-noise level for which the data must be obtained. Analytical expressions are also developed for the first-order error sensitivity of the obtained model with respect to the spatial variables (position and orientation) of the laser. A parametric …
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Patient Satisfaction Related to Noise in the Coronary Care Unit
… score related to environmental noise levels. Based on the Press Ganey score, the patient-satisfaction score plummeted in relation to noise level beginning in March 2014.</p> <p><strong>Purpose</strong> To improve patient satisfaction regarding noise level in the CCU to 100% by …
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Reducing mechanical and flow-induced noise in the surface suspended acoustic receiver
… of the SSAR exhibited very poor signal-to-noise ratios in the frequency band of the hydrophones. This thesis details efforts to reduce the hydrophone noise level by combining the analysis of experimental data with the results from numerical models. Experiments were conducted to quantify …
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Automatic detection of periodic sources in the K2 data sets
… that are significantly above the background noise level, and which have at least one higher harmonic of the fundamental frequency. We show this approach to be relatively inefficient for detecting weaker sources with narrow features, such as transiting exoplanets. The second algorithm that we …
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A new approach to estimate congestion impacts for highway evaluation: effects on fuel consumption and vehicle emissions
… adopted was based on modelling of acceleration noise defined as the standard deviation of the accelerations. During periods of high traffic congestion there is a greater variability in speed resulting in higher acceleration noise levels. Once the acceleration noise level is estimated, the impact …
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Cochlear neuropathy : detection using envelope following responses and Impacts on central auditory coding
… link in the auditory pathway: moderate noise exposure can cause loss of AN fibers without causing hair cell damage or permanent threshold shift. This neuropathy is undetectable by standard clinical examination, but post-mortem evidence suggests that it is widespread in humans. Its impact …
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