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 26 for “"decibel"”.
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Decibel : transactional branched versioning for relational data systems
… each other while still remaining serializable. Decibel is a new relational storage system with built-in version control and transaction management designed to address these shortcomings. Decibel's natural versioning primitives can also be leveraged to implement versioned transactions. Thorough …
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The Impact of Web-Based Visitor Education on Human-Tibetan Macaque (<i>Macaca thibetana</i>) Interactions at Mt. Huangshan, China
… at this site found positive correlations between decibel levels and macaque SDBs, as such decibel levels were recorded daily. I compared the frequencies of macaque and human behaviors and average decibel levels on website “on” or “off” days. On website “on” days, visitors exhibited more …
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The Effect of Sound on Captive Chimpanzees (<i>Pan troglodytes</i>)
… behavioral categories, arousal level, and decibel level. Agonistic behavior occurred more frequently in the highest decibel level category. There was a positive correlation between decibel level and arousal level. These findings suggest the need for increased awareness of sound exposure …
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Reducing the decibels of noise produced by the wood planer in the shop of the Vocational Agriculture Department
… operating and surfacing noise to eighty-five decibels of audible sound revealed that the acoustical treatments would reduce the noise level in the shop. Eighty-five decibels of sound was the established federal safety level at which continuous exposure of the unprotected ear to the noise would …
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Hydroacoustic Parametric Study of Pile Driving-Induced Anthropogenic Sound
… pile driving activities generate significant decibel levels in the surrounding marine environment. Measurements taken from hydrophones placed in the water near the construction site indicate that the high sound pressure levels produced may be harmful to marine life and the environment. As a …
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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
… 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 alfalfa sprouts, spinach, peanuts, ground beef, fish meat, hot dogs, …
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Vibration Suppression Using Smart Materials in the Presence of Temperature Changes
… of the resonance peaks as high as 13.6 decibel. Using the auto-tuning method resonance peak reductions up to 17.4 decibel are possible. The pole/zero identification routine proves to detect the frequencies correctly. The average identification error remained at around one percent even in …
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The Quiet Cafeteria Game
… The current study evaluates the effects of a decibel-level based interdependent group contingency, the Quiet Cafeteria Game (QCaG), on noise levels, appropriate lunchroom behavior, and disruptive lunchroom behavior. Results of the current study indicated that the QCaG effectively reduced noise …
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Impact of the boundary layer on pointing and tracking in airborne free-space laser communication links
… two tracking algorithms can differ by up to one decibel of fiber power, with centroid tracking generally performing best. Conclusions are highly dependent on aircraft and spacecraft parameters but point towards centroid tracking for maximizing received power. Keywords: Lasercom, FPA Tracking, …
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Active control of automobile cabin noise with conventional and advanced speakers
… speakers for control. Attenuation of seven decibel (dB) at the error sensors was measured in the 40-500 Hz frequency band. The dimensions of the zone of quiet generated by the control were measured, and show that noise reductions were obtained for a large volume surrounding the error …
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Toward a micro-scale acoustic direction-finding sensor with integrated electronic readout
… that the sensor can be exposed to at least 162 decibel sound pressure level with no loss of function. Next, an improved capacitive readout system using branched comb fingers is presented. This design is shown to double electrical sensitivity to motion. Finally, it is shown that residual …
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Repurposing Oseltamivir, a Commonly Prescribed Influenza Antiviral, for the Prevention of Noise- and Cisplatin-Induced Hearing Loss
… conferred permanent hearing protection of 15-25 decibel Sound-Pressure Level (dB SPL) for both female and male mice. In mice, oseltamivir treatment reduced outer hair cell death after cisplatin treatment and mitigated cochlear synaptopathy after noise exposure. We showed that a potential binding …
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Contemporary British Literary Culture, Higher Education, and the Diversity Scandal
… studying the reading charity BookTrust, the decibel program's prizing of Hari Kunzru's 2005 novel Transmission, and Spread the Word's Complete Works Scheme for poets of colour.
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The Quiet Classroom Game with an Indiscriminable Contingency in a High School
… were reported in the moderate to large range for decibel level and small to moderate range for student behavior. Social validity measures were also administered to students and teachers, with reports of moderate acceptability from both raters. Findings overall indicate that the QCG is an effective …
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Azimuth Modulation of the Radar Backscatter at Near-Normal Incidence
… the YSCAT radar data shows from a fraction of a decibel to up to 10 decibels of azimuth modulation, depending on the surface conditions. In this thesis, a physical optics approach is used with a two-dimensional surface model to derive the electromagnetic backscatter from the ocean surface. If the …
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The exploration of quieter actuation in animatronic toys
… materials using a sound control box and a decibel meter to measure the output sound pressure level of each enclosure configuration. Among all the evaluated alternatives, from advanced actuation methods to acoustically attenuating enclosures, the acoustical enclosures performed the best. The …
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Development of an acoustic vorticity meter to measure shear in ocean-boundary layers
… directions in typical ocean waves, and a 30 decibel spectral rejection of surface wave velocity. Two instrument deployments are described to show the potential of the system. The instrument has measured shear in the upper-ocean-boundary layer, and these measurements are compared to …
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Use of principal component analysis with linear predictive features in developing a blind SNR estimation system
… (MLP) was trained on extracted features for each decibel level from 0dB to 30dB, in an attempt to create 'expert classifiers' for each SNR level. This type of architecture would then have 31 independent classifiers operating together to accurately estimate the signal-to-noise ratio of an unknown …
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Sonic Apartheid: ecoracism, apartheid geographics and noise pollution in Cape Town's Blikkiesdorp
… and diary entries as well as compiling decibel readings of excessive noise pollution. This data along with noise pollution diaries, photographs, and interviews has been compiled and placed in a digital archive in the form of an open-source ArchGIS Story Map. Combining theory and research …
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Audioptimization : global-based acoustic design
… perception of sound depends on such things as decibel level, direction of propagation, and attenuation over time, none of which are tangible or visible. The advent of computer simulation and visualization techniques for acoustic design and analysis has yielded a variety of approaches for …
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