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 46 for “"Pinna"”.
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Variability in the Pinna Motions of Hipposiderid Bats, Hipposideros Pratti
… and hipposiderid families, have complicated pinna motion patterns. It has been shown that these pinna motion patterns fall into two distinct categories: rigid motions and non-rigid motions. In the current work, the pinna of Pratt's leaf-nosed bat (Hipposideros pratti) was used as a biological …
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Optimizing the Variability in the Deformation of a Biomimetic Pinna
… rhinophid and hipposiderid, feature intricate pinna motion patterns. These pinnae are divided into two groups: stiff movements and non-rigid motions. To understand how pinna sense worked has been studied in this thesis. The rigid pinna movements displayed a significantly different rotation, …
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Investigation of Dynamic Ultrasound Reception in Bat Biosonar Using a Biomimetic Pinna Model
… lives in complex environments. The outer ears (pinnae) of bats are intricately shaped receiver baffles that encode sensory information through a diffraction process. In some bat species with particularly sophisticated biosonar systems, such as horseshoe bats (Rhinolophidae), the pinnae are …
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Oscillating Heat Flow From the Pinna of the Ear of the Rabbit (Oryctolagus Cuniculus)
Heat flow from the pinna of the ear of New Zealand White rabbits (Oryctolagus cuniculus) was studied using infrared (IR) thermography, which measures the thermal characteristics of the pinna more accurately than the standard method of measuring pinna temperature with a thermocouple. Heat flow from …
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Deep Learning-Driven Modeling of Dynamic Acoustic Sensing in Biommetic Soft Robotic Pinnae
… previous studies have endeavored to mimic the pinna (outer ear) dynamics of bats using fixed deformation patterns in biomimetic soft-robotic sonar heads, such physical approaches are inherently limited in their ability to comprehensively explore the vast actuation pattern space that may enable …
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A Numerical Elastic Model for Deforming Bat Pinnae
… are shaped by the surface geometry of the pinnae. Since many bat species are capable of large ear deformations, these beampatterns can be time-variant. To investigate this time-variance using numerical methods, a digital model that is capable of representing the pinna geometry during the …
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A new member of the zygopteridales from the lower Upper Devonian (Frasnian) of Ellesmere, N.W.T., Arctic Canada
… at Bird Fiord. The plant demonstrates a pinnate vegetative system with three orders of branch and laminate pinnules, of a general sphenopteroid type. Primary pinnae usually diverge from the main axis in distichous pairs (Le., in a quadriseriate manner), but rarely depart singly (i.e., in …
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Central Alpha-Adrenoceptors and Behaviour
… guanabenz, caused marked sedation, inhibited the pinna reflex, and were slightly analgesic. Clonidine also inhibited 5-HT-induced head twitches and haloperidol-induced catalepsy. In general, α1 agonists such as methoxamine, had the opposite effect on observed behaviour, producing a syndrome of …
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Revisão sistemática do complexo de espécie Trichomycterus brasiliensis (Siluriformes: Trichomycteridae)
… with more than 100 species described (de Pinna, 1992), but characterized by absence of unique diagnostic features. Therefore, there is no doubt, the genus is non-monophyletic ( de Pinna 1998), to constitute the most problem in the family, and originating the urgent need for news revisions …
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Machine Learning Approaches for Biosonar Systems: Investigating Dynamic Sensing in Complex Natural Environments
… of this research established that static pinna shape variations create consistent, discriminable effects on clutter echoes despite their stochastic nature. Using a biomimetic robotic pinna capable of producing ten distinct conformations, we recorded over 50,000 clutter echoes from …
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Biomimetic sonar design and the investigation of the role of peripheral dynamics for target classification in bat biosonar
… One such adaptation is the rapid motion of the pinna and noseleaf observed in certain families of old-world bats (Rhinolophidae and Hipposiderae). Little is known about the physical properties about this adaptation affects emitted pulses or incoming echoes. To explore the physical properties of …
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The Effects of Hypobaric Pressure on Thermoregulation in The Unrestrained New Zealand White Rabbit, Oryctolagus Cuniculus
… temperatures while monitoring metabolism, ear pinna temperature, back temperature, preoptic temperature, breathing rate and heart rate.
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Visually adaptive virtual sound imaging using loudspeakers
… related transfer functions measured without the pinna is also presented. This was performed to provide a starting point for future modelling of pinna responses. The update of the audio signal processing scheme is initiated by a visual tracking system that performs head tracking without the need …
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Morphological study of Schizaea Pectinata (L.) Sw. (Schizaeaceae)
… of spore and stomata size, and the number of pinna pairs per lamina. Statistical analyses showed that interpopulation variation for these characters are often highly significant. Phonetic methods were used in the analyses of the data set and shows continuous variation in this species. This …
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Effect of head width, head height and clamp force on the noise reduction provided by two different styles of earmuffs
… earmuff securely against the head and around the pinna. This clamp force must be high enough to provide a good seal, but not so high that it makes the muff uncomfortable. This study investigated the relationship between noise reduction (NR) and the force on the ear. This force was incrementally …
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Influence of increased sediment exposure on suspension-feeder assemblages in a temperate seagrass meadow
… of the ascidian Herdmania momus and the bivalve Pinna bicolor. For the sponge Tethya sp, the contribution of sedimentary organic matter to its diet increased at sites with high sediment exposure, suggesting a potential benefit to its diet. Overall, the influence of sediment exposure on suspension …
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Building resilience towards natural hazards: cross-‐scale knowledge and institutional linkages.
… events are introducing elements of uncertainty (Pinna, 2002). The idea of certainty or security that was fundamental to risk management in the past, collapses. In this context, the notion of ‘risk society’, introduced by Ulrich Beck in 1992, is considered as a shifting paradigm in world security, …
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Ertuygla: áhrif ertuyglu á mismunandi afkvæmahópa alaskaaspar
… og heildarbeit á plöntum. Afkvæmahópur Súlu/Pinna komu best út fyrir báðar breyturnar en afkvæmahópur Súlu/Hallorms kom marktækt verst út. Hæð plantna virtist ekki skýra beitina því lægri plöntur voru ekkert frekar illa farnar en lægri plöntur þannig að það er eitthvað í erfðaefni plönturnar …
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A novel model system for the study of anti-tumour T-cell memory
… ß-gal<sup>+</sup> T-Iymphoma into the ear pinna of syngeneic DBN2 mice, followed by an intraperitoneal challenge with irradiation-inactivated tumour cells. 33.9 % of CD8<sup>+</sup> iPEC were shown to be recognising the immunodominant peptide of ß-gal (aa 876-884), and, consistently, the …
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