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Showing 1 to 20 of 213 for “"Quality factor"”.
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Design of a high quality factor spiral inductors in RF MCM-D
… the methodology that finds devices with optimal quality factor at a given frequency is presented. Several inductor designs are generated using this implementation, and the devices are fabricated in the Draper Laboratory, Inc. Multichip Module-Deposited (MCM-D) process. Simulated characteristics …
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Tailoring the Geometry of Micron Scale Resonators to Overcome Viscous Damping
Improving the quality factor of the mechanical oscillations of micron scale beams in a viscous fluid, such as water, is an open challenge of direct relevance to the development of future technologies. We study the stochastic dynamics of doubly-clamped micron scale beams in a viscous fluid driven by …
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Evaluating energy dissipation during expansion in a refrigeration cycle using flue pipe acoustic resonators
… 10% to 60%. The range is so large because the quality factor of the experimental flue pipe is unknown. This quality factor is imperative in determining the power dissipation. Further research should optimize the quality factor. A large quality factor causes less amplitude attenuation than a …
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Scanning Probe Microscopy of Biomaterials and Nanoscale Biomechanics
… soft biomaterials has been hindered by a low quality factor caused by large drag forces on the cantilever. Utilizing the small dimensions of a nanoneedle, the new method presented in this dissertation resolves the complications by keeping the cantilever outside of the liquid and using a …
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MICROWAVE ACTIVE INDUCTOR ANALYSIS AND DESIGN
… integrated circuit size and to achieve a better quality factor, more broadband and higher value inductance. The conventional passive inductor has an intrinsic resistance and a stray capacitance, which will severely affect its quality factor and available frequency band in the circuit design. In …
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Temperature and Thermal Noise Suppression for Precision Mechanical Experiments
… sensor for the entanglement with gravity. The quality factor of a resonant sensor must be sufficiently high such that the sensor is not dominated by thermal noise and the sensor can be cooled to the ground state. This thesis creates scaling laws for the interaction between the mass size bonded …
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Modeling and Design of a Three-dimensional Inductor with Magnetic Core
… and area for a meager value of inductance and quality factor. The need to overcome these issues has led to the development inductors with new geometries housing magnetic cores that show an enhanced inductance compared to the air core coil. In this thesis, we discuss the design of a …
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Combined methods and instrumentation for dosimetric monitoring of the large fluence hadron irradiations /
… energy, a corrective radiation weighting factors are applied to convert the absorbed dose measured in the unit gray, into the equivalent dose measured in the unit sievert (Sv). The dose equivalent is the product of the absorbed dose of ionizing radiation and the dimensionless quality …
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Didelių įtėkių hadronų apšvitų dozimetrijos kombinuoti metodai ir įranga /
… energy, a corrective radiation weighting factors are applied to convert the absorbed dose measured in the unit gray, into the equivalent dose measured in the unit sievert (Sv). The dose equivalent is the product of the absorbed dose of ionizing radiation and the dimensionless quality …
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The influence of physical system parameters on the performance of adaptive filters for system identification of mechanical systems
… systems for a given input. The effects of quality factor (Q), dispersion and transmission time on adaptive filter performance were investigated. Optimal filter delay times and tap weight vector lengths were determined.
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ΕΠΙΔΡΑΣΗ ΤΗΣ ΦΥΣΗΣ ΤΩΝ ΑΝΙΟΝΤΩΝ CL ΚΑΙ S04 ΣΤΗ ΔΟΜΗ ΚΑΙ ΤΙΣ ΙΔΙΟΤΗΤΕΣ ΤΩΝ ΗΛΕΚΤΡΟΛΥΤΙΚΩΝ ΕΠΙΘΕΜΑΤΩΝ ΝΙ
… B) CORROSION, C) REFLEXION, D) HARDNESS, E) QUALITY FACTOR Q.
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Second Harmonic Generation in Silicon Photonic Crystal Resonators for Quantum Optic Applications
… that has octave-separated resonances with high quality factor, low mode volume, high nonlinear coupling is implemented in the form of a one dimensional photonic crystal nanobeam cavity for efficient second harmonic generation.
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Investigation of the Superconducting Properties of Niobium Radio-Frequency Cavities
… to reduce those losses and improve the cavity's quality factor. Several models have been proposed to explain the cause of the <em>Q</em>-drop and the baking effect. We investigated the effect of baking on niobium material parameters by measuring the temperature dependence of a cavity's surface …
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Periodic subwavelength photonic structures
… The challenge is that we want to observe high quality factor resonant peaks while reducing the size of the crystal to less than 10 microns. So far the highest quality factor observed was about 800. The third application is a Fano silicon photonic crystal modulator waveguide device. The resonant …
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The Stochastic Dynamics of Optomechanical Sensors for Atomic Force Microscopy
… water. These important diagnostics include the quality factor Q and natural frequency in fluid omega_f. It is found that the nanobeam is overdamped in water. However, the nanobeam is underdamped in air and has quality factor of Q is approximately 4. The noise spectrum is determined from …
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Solid-State Terahertz And Millimeter-Wave Electronics: Reaching The Fundamental Limits
… of concealed weapons, cancer diagnosis, food quality control, and breath analyses for disease diagnosis are among many examples that will rapidly flourish if compact and on-chip terahertz systems are realized. There are few implementations of terahertz building blocks using compound …
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High Yield Fabrication of Monolayer WSe₂ Mechanical Resonators and a Study of Their Loss Mechanisms
… necessary to develop methods of improving their quality factors. The first step on this road is understanding the dominant mechanical loss mechanisms in monolayer WSe<sub>2</sub> mechanical resonators. In this thesis, I describe the method I have developed to fabricate fully suspended monolayer …
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Multi-Physical Study of MEMS Resonators and Oscillators
… along their center lines, are both analyzed. The quality factor and resonant frequency are obtained as functions of various geometrical parameters including the location, number and size of the vents. The numerical results reveal that the addition of vent sections in the clamped end region can …
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Cavity coupled photonic crystal enhanced fluorescence for high sensitivity biomarker detection
… beneath. The mirror is expected to increase the quality factor of the guided mode optical resonator in the photonic crystal improving the mechanism of enhanced excitation acting on the fluorophore. The mirror is also expected to improve the mechanism of enhanced extraction by redirecting the …
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