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Showing 1 to 20 of 57 for “"Quality factor (Q)"”.

  1. The influence of physical system parameters on the performance of adaptive filters for system identification of mechanical systems

    Dargel, Michael R.Monterey, California. Naval Postgraduate School1996

    … 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.

    nps Repository record

  2. ΕΠΙΔΡΑΣΗ ΤΗΣ ΦΥΣΗΣ ΤΩΝ ΑΝΙΟΝΤΩΝ CL ΚΑΙ S04 ΣΤΗ ΔΟΜΗ ΚΑΙ ΤΙΣ ΙΔΙΟΤΗΤΕΣ ΤΩΝ ΗΛΕΚΤΡΟΛΥΤΙΚΩΝ ΕΠΙΘΕΜΑΤΩΝ ΝΙ

    Καραγιάννη, Χάιδω-ΣτεφανίαΕθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ)1987

    … B) CORROSION, C) REFLEXION, D) HARDNESS, E) QUALITY FACTOR Q.

    greece Repository record

  3. Constraining the Radial Structure of Seismic Attenuation using Multiple S-Wave Datasets

    Irumhe, Emmanuel PaulVirginia Tech2025

    Seismic attenuation, quantified by the quality factor Q, provides crucial constraints on Earth's thermal and chemical structure due to its strong sensitivity to temperature and presence of volatiles. This study investigates the radial Q structure of Earth's mantle using amplitude measurements from …

    vt Repository record

  4. Investigation of thermoacoustic muffler

    Che, Chun-HuaMonterey, California: Naval Postgraduate School1992

    … is characterized by its ability to reduce the quality factor Q of an acoustic resonator. Measurement of the Q of a helium filler muffler were made for temperature differences ranging from 0 to -130 degrees C. The measured Q-reduction, approximately 30%, agrees with predicted reductions. The …

    nps Repository record

  5. On-chip self-rolled-up nanomembrane tube inductor for RFIC performance enhancement

    Huang, WenUniversity of Illinois at Urbana-Champaign2014

    … of the planar spiral inductors, with excellent quality factor (Q) and much higher operating frequency than the 2D counterparts in both capabilities.

    uiuc Repository record

  6. AN INVESTIGATION OF SEISMIC ATTENUATION IN MARINE SEDIMENTS

    EDDIES, RODERICK DAVID1994

    … propagating pulse have a low-pass effect. The quality factor, Q, was measured in two case studies. In the first, the mean Q was determined from wavelet and spectrum modelling and found to be 60 for fine sands and 47 for coarse sands in the 1 kHz to 3 kHz frequency band. In the second, Q was …

    plymouth Repository record

  7. Structural Wireless Delamination Sensor

    Ghosh, AniruddhaMassachusetts Institute of Technology2025

    … to induce delamination crack growth. The quality factor Q of the SE was varied (Q = 18, 3.2, 1.6, 0.8) by adding different external resistors, and a signal was acquired wirelessly for each value of Q as the delamination crack propagated. The wirelessly acquired signal was also sampled …

    mit Repository record

  8. Solid State MEMS Resonators in Silicon

    Wang, Wentao, Ph. D. Massachusetts Institute of TechnologyMassachusetts Institute of Technology2015

    … relative to released ones, especially quality factor Q. Energy localization structures, such as acoustic Bragg reflectors (ABRs) are implemented for such solid state resonators to maintain high Q and suppress spurious modes. Towards the goal of high aspectratio structures that have the …

    mit Repository record

  9. The design and fabrication of an electrically activated photonic crystal microcavity laser

    Griñe, Alejandro (Alejandro Joaquin)Massachusetts Institute of Technology2007

    … coupling into radiation modes increasing the quality factor (Q) of the cavity.

    mit Repository record

  10. Modeling velocity dispersion In Gypsy site, Oklahoma

    Alsaadan, Sami IbrahimMassachusetts Institute of Technology2010

    … Relation (LDR) to calculate a constant Quality Factor (Q) that best explains the observed velocity dispersion for each of the intervals of interest. The elastic scattering component of the dispersion is negligible. Intrinsic quality factors of 54,35,28, and 30 best explain the field data …

    mit Repository record

  11. A feature-based fingerprinting scheme robust to desynchronization

    Gigaud, GuillaumeUniversity of Illinois at Urbana-Champaign2010

    … of Gaussian noise, JPEG compression (with quality factor Q=45), cropping (50% of the image area), affine transforms, homography and image warping.

    uiuc Repository record

  12. Analysis and Design of Wide Tuning Range Low Phase Noise mm-wave LC-VCOs

    Wu, QiyangThe Ohio State University2013

    … a detailed analysis of the frequency dependent quality factor (Q) of the LC-tank is performed to characterize the tank loss. The relationship between the cross-coupled pair gm and the operating frequency is further derived.</p><p>To extend the tuning range, active negative capacitance (NC) …

    ohiolink Repository record

  13. Theoretical investigation of metal-cavity nanolasers and nanoLEDs and comparison with experiments

    Ni, Chi-YuUniversity of Illinois at Urbana-Champaign2012

    … then apply Poynting’s theorem to calculate the quality factor (Q) of a nanobowtie antenna and further analyze its radiation pattern and material loss. The calculated Q agrees well with the experimental data and, thus, the validity of the formula is verified. The third study is to analyze the …

    uiuc Repository record

  14. Theory and simulation of surface effects on intrinsic dissipation

    De, SubhadeepUniversity of Illinois at Urbana-Champaign2016

    … surface, the former dominates and the inverse quality factor (Q^-1) is found to increase with the decrease in size. However, different scaling trends are observed in the case of a H-terminated silicon surface with no defects and dimers. Particularly, in the case of a H-terminated silicon, if …

    uiuc Repository record

  15. Acoustic Bragg reflectors for Q-enhancement of unreleased MEMS resonators

    Wang, Wentao, Ph.D. Massachusetts Institute of TechnologyMassachusetts Institute of Technology2011

    … reflectors (ABRs) for energy localization and quality factor (Q)- enhancement for unreleased resonators. Two of the greatest challenges in MEMS are those of packaging and integration with CMOS technology. Development of unreleased MEMS resonators at the transistor level of the CMOS stack will …

    mit Repository record

  16. High-Performance High-Power Inductor Design for High-Frequency Applications

    Joisher, Mansi VipulMassachusetts Institute of Technology2023

    … (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 Q, air-core inductors can induce electromagnetic interference (EMI) and eddy current …

    mit Repository record

  17. On-chip Spiral Inductor/transformer Design And Modeling For Rf Applications

    Chen, Ji

    … controlled oscillator (VCO) design, for its quality factor (Q) value directly affects the VCO phase noise. The optimization of inductor layout can improve its performance, but the improvement is limited by selected technology. Inductor performance is bounded by the thin routing metal and …

    ucf

  18. Planar chalcogenide glass materials and devices

    Hu, JuejunMassachusetts Institute of Technology2009

    … glasses, with a record loaded cavity quality factor (Q-factor) exceeding 2 x 105.

    mit Repository record

  19. The Stochastic Dynamics of Optomechanical Sensors for Atomic Force Microscopy

    Epstein, Stephen DavidVirginia Tech2013

    … 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 …

    vt Repository record

  20. Influence of grain size evolution and water content on the seismic structure of the oceanic upper mantle

    Elsenbeck, James R.Massachusetts Institute of Technology and Woods Hole Oceanographic Institution2007

    … a Burger's model system to calculate seismic quality factor (Q) and shear wave velocity (Vs). For ages older than 50 Myrs, we find that Q and Vs predicted by the dehydration case best match seismic reference models for Q and the low seismic shear wave velocity zone (LVZ) observed in the …

    woods-hole Repository record

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