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 45 for “"Silencer"”.
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Application of microperforated elements in axial fan noise control and silencer design
… were used in fan noise control and in acoustic silencers, where both of the devices are easily accessible by humans.
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From Communicative Silencer to Responsive Listener: Participation and Public Dialogue in Benin
… framing of two major metaphors: communicative silencer and responsive listener. First, the interpretation unveils that the possibility of broad participation in the democratization of Benin is compromised by a culture of silence in which intellectual elite become communicative silencers of the …
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Molekulargenetische Analyse eines evolutionär konservierten Silencer-Elements aus dem murinen H19-Locus in Drosophila melanogaster
… Regionen, Chromatin-Insulators, Enhancer und Silencer zählen. Das murine H19-Gen ist einer der am intensivsten erforschten genomisch geprägten Loci. Eine zentrale Rolle in der monoallelischen Expression des H19-Gens spielt ein Silencer-Element, das die Repression des paternalen H19-Allels …
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Replication and Silencing at the Hmr-E Compound Origin in Saccharomyces Cerevisiae
… (bp) region termed HMR-E functions as both a silencer and an origin of DNA replication. Replication activity assays of the HMR-E region revealed that it consisted of not one, but a minimum of three independent subregions capable of ARS (autonomously replicating sequence) and chromosomal origin …
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Implementation of Refractory Foam Technology for Silencing Small IC Engines
… of porous material, for designing effective silencers for small IC engines. The solution must be lightweight, compact, conformable, and capable of handling the rigors of flight. Throughout the course of this research, many silencer designs were fabricated to take advantage of refractory foam …
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Acoustic metamaterials : microperforated shell and Helmholtz resonator
… design a high-performance and broadband acoustic silencer. Specifically, five slit-type Helmholtz resonators, which possess a massive viscous area, are packed together to create a single-layer silencer. In turn, two single-layer silencers are combined to form a double-layer silencer, which in …
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Acoustic and thermal packaging of small gas turbines for portable power
… in an anechoic chamber using a modular silencer test rig. Acoustic liners based on porous fiber material were developed for both cold intake and hot exhaust gas silencers to reduce the broadband noise. The source noise simulations combined with the measured silencer noise reduction show …
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Development of a test facility for making in-duct sound measurements according to Astm E477-1984
Duct silencers must reduce sound levels enough to be noticed by the human ear. By placing the appropriate duct silencer in the air-conditioning duct system, sound levels in rooms where noise is a problem can be significantly reduced. Only through insertion loss measurements can the appropriate …
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Prediction of performance criteria for passive heating ventilation and air conditioning silencers
… noise can be reduced by installing a passive silencer in the HVAC system. The ability to predict the performance criteria (insertion loss, regenerated sound power, and pressure drop) associated with a passive silencer is of great importance to the HVAC engineer. The purpose of this thesis is …
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Improvement and establishment of the tTA-dependent inducible system in the mouse brain
… other than hippocampus by the neuron-restrictive silencer element (NRSE) of the NR2C subunit. The expression pattern and activity of the htTA under control of the NR2C silencer-containing chimeric promoter were observed restrictively in hippocampus of two lines, namely only in DG, and in CA1 and …
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Interaction between positive- and negative- regulatory elements in the first intron controls transcription of the glutamine synthetase gene during adipocyte differentiation
… 32 bp enhancer as well as a closely associated silencer in the first intron of the GS gene. This was accomplished by electrophoretic mobility shift analyses (EMSA) and functional analyses of stably transfected fusion genes composed of putative regulatory elements alone or in combination. To …
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Characterization and Development of Strategies for Altering Protein Expression in JSL1 Cells
… gene have revealed the presence of an exonic silencer sequence within variable exon 4 that is capable of influencing exon skipping under both resting and stimulated conditions. Biochemical assays have shown that the regulatory protein hnRNP L binds to this silencer sequence and results in …
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H-NS Counter-silencing as a Primary Regulatory Mechanism of Curli Gene Expression in Salmonella Typhimurium
… an essential role of CsgD as a direct counter-silencer to H-NS silencing. Using a suite of footprinting techniques in vitro, I was able to determine that CsgD causes a topological distortion to disrupt the H-NS nucleofilament and reinstate RNA polymerase open complex formation. While σS appears …
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Identification and Characterization of the Cis-acting Elements Around the Murine cd4 Cnhancer
… Two novel <em>cis</em>-acting elements with silencer function were discovered by Bal 31 deletions. Their silencer functions were further confirmed by subcloning them at different positions and different orientations relative to CD4 promoter. These subcloned constructs were tested for function …
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Designer Exons Inform a Biophysical Model for Exon Definition
… design (including an exonic splicing enhancer or silencer). Studies were performed in vitro with a set of DEs obtained from random combinations of the exonic splicing enhancer and the exonic splicing silencer modules. The results showed considerable variability both in terms of the composition and …
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Combinatorial Regulation of Signal-Induced CD45 Exon Repression by hnRNP L and PSF
… repressed. Previous work identified the ESS1 silencer element that functions to mediate exon 4 silencing under resting conditions by binding to hnRNP L. ESS1 is also sufficient to confer the activation-induced increase in exon repression, and this document describes two mechanisms responsible …
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Development and Initial Evaluation of an Acoustic Apparatus Used For Testing of Farfield Noise Emitted by a Propeller in a Short Duct
… the shroud in place, as well as various engine silencer configurations. The data gathered proved the apparatus was actually about 6 dB louder with the shroud than without the shroud as a result of strong rotor-stator interactions. Based on the initial evaluations, this apparatus demonstrated its …
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Molecular Mechanisms of Alternative Splicing Regulation: An Investigation of the Spliceosome Repressed by Hnrnp L on Cd45 Exon 4
… Splicing regulators that bind to enhancer or silencer elements on the pre-mRNA can alter assembly of these spliceosome components. Understanding how splicing regulators control spliceosome assembly will bring insights to the prediction of splice site choices. In our lab, we used CD45 as a …
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The Design and Construction of a 20" x 20" Mach 2.0 Blowdown Wind Tunnel to Characterize the Lift and Drag of Irregularly Shaped Fragments
… using SolidWorks. The control valve and silencer were sized and selected for the expected tunnel operating conditions. Since the control valve tends to encompass a significant portion of the overall tunnel cost, care must be taken to ensure it has a large enough flow capacity to produce …
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Development of an automated throw room and HVAC component acoustic test systems
… test facility currently used for in-duct passive silencer testing. The other new facility will be used to rate the air performance of HVAC interior inlets and outlets. This system is commonly referred to as a throw room; HCATS includes a supply air fan and closed circuit duct work to carry air to …
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