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 117 for “"High-Q"”.
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A High-Q Micromachined Quatrefoil Suspension Gyroscope
… the best results documented in the literature on high performance MEMS CVGs. In addition to the QSG, the mode-matched operation of an edge-anchored bulk acoustic wave (BAW) gyroscope is also reported in this work. Gyroscopic operation in amplitude modulation (AM) is demonstrated in both the …
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Ultra-high-Q Microresonator with Applications towards Single Nanoparticle Sensing
… enhanced light-matter interactions. Using ultra-high-Q microtoroids and focusing on a phenomenon called mode splitting, we demonstrate the theory and experiments for real-time and label-free detection and size measurement of individual nanoparticles and viruses, with a theoretical size limit of …
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Electroproduction of Phi(1020) Mesons at High Q² with CLAS
This analysis studies the reaction ep → e′p′ϕ in the kinematical range 1.6 ≤ Q² ≤ 3.8 GeV² and 2.0 ≤ W ≤ 3:0 GeV at CLAS. After successful signal identification, total and differential cross sections are measured and compared to the world data set. Comparisons are made to the predictions of the …
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High-Q superconducting coplanar waveguide resonators for integration into molecule ion traps
Over the last decade, quantum information experiments with trapped ions have demonstrated essential steps towards quantum computing and quantum simulation. Large fields are required to achieve strong coupling to the ions via dipolar interactions, and so we fabricated transmission line …
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DESIGN, SIMULATION AND OPTIMIZATION OF HIGH Q RF SPIRAL INDUCTORS ON SILICON CHIPS
… the lossy Si substrate makes the design of high Q passive components difficult. Although there have been many works done to find many methods to improve the Q factor, the optimization of the spiral inductors is a never end job, and there is a continually great incentive to design, optimize, …
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Experiments to develop High Q and tunable superconducting coplanar resonators applicable for quantum bit technology
… affect the electric permittivity. Applying higher input microwave power levels is shown to saturate these two level systems, essentially decoupling them from the CPR resonance. This is observed as an increase in resonant frequency and Q factor. The resonant frequency is also shown to have a …
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Development of high-Q micromechanical cell mass sensor (optimizing parameters for in-plane mass sensors)
… requires measurement devices that provide high sensitivity, high throughput, and adaptability to include multiple on-chip functionalities. Many MEMS-based resonant sensors have been extensively studied and used as biological and chemical sensors. However, previous works have shown that …
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The design of high Q-factor silicon integrated inductors for up to 4 GHz applications
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
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Acoustic resonators with integrated microfluidic channels for ultra-high Q-factor: a new paradigm for in-liquid gravimetric detection
<p>Biosensing is a critical area of research that involves detecting and measuring biological molecules. Among the various types of biosensors, acoustic biosensors are attractive for their simplicity, robustness, and low cost, particularly in point-of-care (POC) applications. However, the quality …
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A piezo-tunable gigahertz cavity microelectromechanical resonator
RF systems need high-frequency widely-tunable high-Q bandpass filters for channel selection filters and local oscillators. This thesis describes the design, fabrication and testing of a electromagnetic cavity resonator designed for such applications. Alternative technologies provide wide tuning or …
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Ultrasensitive CMOS-compatible lab-on-a-chip integrated photonic sensors with wideband operation
… the essential sensor building block, two high-quality-factor (high-Q) Si3N4 spiral-based coupled-resonator devices and high-Q SiC slot-ring resonators at near-IR wavelengths are demonstrated with high detection capability. Additionally, an integrated mid-IR metasurface (MS) on a SiC …
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Time-varying Small Antennas for Wideband Applications
… wireless communication systems is to achieve a high-rate data transmission through electrically small antennas. However, the overall transmission bandwidth is limited by the antenna size. As a well-known physical limitation, maximum achievable bandwidth of a small antenna is governed by the …
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Multi-channel ultra-low-power receiver architecture for body area networks
… monitoring systems, a common thread is the high power consumption of the radio compared to the other system components. This observation is indicative of a natural place to attempt a reduction in system power. Narrowband receivers in-particular can enjoy significant power reduction by …
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Radiation Pressure induced Nonlinearity in Micro-droplet
… boundary. Such resonators can exhibit very high quality (Q) factors, since the resonator surface can maintain atomic level smoothness. The combination of high Q factors and small resonator volumes has led to a wide range of applications in sensing, optomechanics, nonlinear optics, and …
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Solid State MEMS Resonators in Silicon
… for such solid state resonators to maintain high Q and suppress spurious modes. Towards the goal of high aspectratio structures that have the capability of direct CMOS integration, deep trench (DT) capacitor based MEMS resonators are studied and demonstrated. This concept enables high Q, low …
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Seismic attenuation of regional phases in the northern Middle East and the Tibetan Plateau
… such as low Q within the Anatolian Plateau and high Q within much of the Arabian Plate. In Tibet, I have observed low Q in the northernmost Tibetan Plateau and high Q in the Qaidam basin. My method to solve site responses can be applied in earthquake hazard studies. Azimuthal anisotropy of Q has …
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High-Performance High-Power Inductor Design for High-Frequency Applications
… Frequencies (RF) of many MHz and above. In the High Frequency (HF, 3-30 MHz) range, coreless (or "air-core") inductors with a typical quality factor (Q) of 200-300 are conventionally used and are often the major contributor to the overall system’s loss and size. Even when they can achieve high …
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Development of Nanoelectromechanical Resonators for RFIC Applications
… of these functions is the requirement for high-Q resonators in RF filter and tank circuits. Current on-chip techniques being used to realize monolithic RF resonators based on planar inductors, capacitors and active circuits are accompanied by problems such as high loss, large chip area and …
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