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 47 for “"attenuator"”.
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An active audio attenuator
Thesis. 1976. B.S.--Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.
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Design of Chassis, Impact Attenuator, Suspension and Aerodynamic Systems of a Formula SAE Car
… an attempt made to design the chassis, impact attenuator, aerodynamics and suspension systems of the first UH College of Technology Formula SAE car. A systematic design methodology was adopted to tackle the challenge of having many unavailable inputs while designing each subsystem. The …
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Novel Segment Deformable Mirror Based Adaptive Attenuator Used In Wavelength Division Multiplexed Optical Communications Network
… at each wavelength is needed. An adaptive attenuator is a device with a chromatically variable transmissivity used to equalize channel powers in wavelength-division multiplexing (WDM) fiber-optic communication lines. In this thesis, a method of Fourier analysis of multi-beam interference is …
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Mechanistic and Functional Characterization of B and T Lymphocyte Attenuator (Btla) In Cd8 Tumor Infiltrating Lymphocytes
… co-inhibitory molecule BTLA (B-and-T lymphocyte attenuator) was highly associated with clinical response, while expression of other co-inhibitory molecules such as PD-1, TIM-3, and Lag3 did not associate with response. BTLA is expressed by T cells, B cells, and NK cells and serves as a T cell …
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Characterization of A transcriptional Attenuator in The rpmf-Plsx-Fab Operon of Escherichia coli K-12
… that a weak transcriptional terminator (an attenuator) lies at the 5' end of plsX. The attenuator was localized to a 200 bp segment. Analysis of the secondary structure of the attenuator mRNA has lead to a model which includes four stem-loop structures. In this model, the plsX start codon …
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Analysis of a Carbon Fiber Reinforced Polymer Impact Attenuator for a Formula SAE Vehicle Using Finite Element Analysis
<p>The Hashin failure criteria and damage evolution model for laminated fiber reinforced polymers are explored. A series of tensile coupon finite element analyses are run to characterize the variables in the physical model as well as modeling techniques for using an explicit dynamic solver for a …
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Design and Implementation of an Analog High Power Broadband Self Interference Canceller for In Band Full Duplex
… couplers and switches with a custom variable attenuator designed using PIN diodes in a Waugh attenuator architecture. The system was fabricated on a four layer PCB and measured with a network analyzer. Simulated results for variable attenuator and overall vector modulator are presented.
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Transcriptional Regulation And Autogenous Control Of The Genes For The Beta And Beta' Subunits Of Escherichia Coli Rna Polymerase
… a weak promoter rplLp, and a transcriptional attenuator rpoBa located between rplL and rpoB. From this data, the relative contribution of each transcriptional signal to the overall transcription of rpoBC was determined. It was found that almost all transcription initiated from the strong rplKp …
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Resonator sensors integrated in bandpass filters for the detection and attenuation of interfering signals
… the simulation results shows that a tunable attenuator can be realized. The filters is designed, fabricated and tested. The 3-pole filter with no sensor is fabricated and tested first while evaluating different ways to realize the vias from the top to bottom layers of the microstrip …
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Characterization of an operon containing a ribosomal protein gene and lipid biosynthetic genes in Escherichia coli K-12
… of multiple promoters, an internal terminator (attenuator), differential degradation of transcripts, and differential efficiency of translation initiation. Portions of transcripts arising upstream of rpmF terminate at the attenuator located just downstream of the plsX initiation codon, and some …
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Characterization of a 6 MV photon beam in terms of primary and scattered dose components
… and through a method involving a central axis attenuator. The primary dose component was determined in two ways, namely by the extrapolation of the phantom scatter correction factor to zero field size and also by the central axis attenuator method. μ 0 varied from 0.0445 cm-1 to 0.0469 …
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A Test and Characterisation Facility for Cryogenic Low Noise Amplifiers
… the factors is the thermal gradient across the attenuator. This was investigated via a limited thermal study and a solution was proposed and implemented.
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Investigating detonation fronts in small explosive charges using a wave shaper
… using inert wave shaper (also called an attenuator) is a simple solution. Wave shapers have been used for decades in shaped charge applications in larger warheads, but this current research has miniaturized the design to very small charges (8 mm in diameter and 5-6 mm long). The smaller …
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The molecular mechanisms of transcription termination and pausing in the Escherichia coli threonine operon regulatory region
… dyad symmetry in the Escherichia coli thr operon attenuator were constructed. Assays of these templates in an in vitro transcription system showed that the DNA sequence of the template strand determines the transcription termination efficiency. There was no indication that the potential …
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Transcription termination by bacteriophage T7 RNA polymerase at rho-independent terminators
… the RNA encoded by the A+T-rich regions of the attenuator is not mandatory for termination.
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Optimization of radiometric channel solar calibration for the Clouds and the Earth's Radiant Energy System (CERES) using the Monte-Carlo method
… to observe typical Earth scenes. Therefore an attenuator is required. The Earth Radiation Budget Experiment (ERBE) radiometers, operational since 1984, relied on a mirror attenuator mosaic (MAM) to attenuate the solar energy. The ERBE MAM is an array of 105 tightly packed concave spherical …
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Numerical Analysis and Parameter Optimization of Portable Oscillating-Body Wave Energy Converters
… WECs were studied: bottom hinged and two-body attenuator. For the bottom-hinged device, the goal was to show the feasibility of an oscillating surge WEC and desalination system using numerical modeling to estimate the system performance. For a 5-day test period, the model estimated 517 L of …
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De novo designs of programmable toehold-mediated transcriptional attenuators
… programmable toehold-mediated transcriptional attenuators that can transcriptionally repress gene expression via toehold-mediated strand displacement. My designs ensured the proper formation of the secondary terminator hairpin structure necessary for transcription attenuation and determined a …
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Analog adaptive nonlinear filtering and spectral analysis for low-power audio applications
… can be amplified by including a capacitive attenuator in the feedback path of filter. In order to increase the dynamic range, I explored the non-linear operation of the filters, including jump resonance. Unlike harmonic distortion and gain compression which slowly increase with the input …
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RNA-based portable genetic circuits and synthetic plasmids
… mechanism of pMB1 is replaced by pT181 RNA attenuator which allows the creation of modular plasmid library and plasmid replication-based circuits.
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