This note reports on the influence of aircraft wake vortices on the estimation of the turbulent energy dissipation rate using sonic anemometer measurements near the runway threshold. The wake vortex traces, which are generated at a height of about 65m and subsequently evolve in ground effect, are clearly visible in the velocity components and temperature. The observed temperature increase of 1K...

The Electricity Division at the Nationals Institute of Standards and Technology (NIST, formerly NBS) has developed the capability to characterize capacitance and dissipation factor for four terminal-pair (4TP) air dielectric capacitors at frequencies from 1 kHz to 10 MHz. The method, based on work by Cutkosy and Jones of NBS and recent developments by Hewlett-Packard Japan, involves single-port...

Thin flhns of lithium niobate were deposited on silicon ( 100) by a sol-gel technique and were annealed in oxygen at 400 “C. The annealed films were characterized by x-ray diffraction and transmission electron microscopy which showed crystallization to LiNbO,, a preferred orientation of the films, and an average grain size of about 0.5 ym. Electrical characterization of the films in the metal-f...

Day by Day as the technology is shrinking and as chip density and frequency are increasing, power dissipation on data bus has become the most predominant factor than the power dissipation in other part of the circuitry. Further de facto, the inter-wire capacitance becomes a dominating factor in proliferating Deep Submicron Technology (DSM) compared to substrate capacitance. So, the earlier sche...

The fluctuation-dissipation relation is well known for a quantum open system with energy dissipation. In this paper a similar underlying relation is found between the bath fluctuation and the dephasing of the quantum open system, for which energy is conserved, but the information is leaking into the bath. To obtain this relation we revisit the universal, but simple dephasing model with a quantu...

Nanomechanical resonators enable a range of precision measurements in air or vacuum, but strong viscous damping makes applications in liquid challenging. Recent experiments have shown that fluid damping is greatly reduced in fluidic embedded-channel microcantilevers. Here we report the discovery of nonmonotonic energy dissipation due to the fluid in such devices, which leads to the intriguing p...

Frequency-modulated operation of MEMS gyroscopes promises numerous benefits, including inherently accurate scale factor, improved bias stability, high dynamic range, and low power dissipation. An FM demodulator based on sigmadelta frequency-to-digital conversion decouples dynamic range from power dissipation to achieve a resolution of 41.1μHz in a 50Hz bandwidth for a 30 kHz signal (2.1mdeg/s/ ...

Dynamic voltage and frequency scaling has been identified as one of the most effective ways to reduce power dissipation. This paper discusses a compilation strategy that identifies opportunities for dynamic voltage and frequency scaling of the CPU without significant increase in overall program execution time. The paper introduces a simple, yet effective performance model to determine an effici...

A new approach for calibrating automated highvoltage current-comparator-based capacitance and dissipation factor bridges is presented. The approach is slightly different from another published previously. It leads to larger uncertainties, but is slightly easier to implement, since the digitizers need not be synchronized to the signal generators. It is possible to simulate capacitance ratios fro...