This paper investigates the coupled axial-radial (CAR) vibration of single-walled carbon nanotubes (SWCNTs) based on doublet mechanics (DM) with a scale parameter. Two coupled forth order partial differential equations that govern the CAR vibration of SWCNTs are derived. It is the first time that DM is used to model the CAR vibration of SWCNTs. To obtain the natural frequency and dynamic respon...

Signal-dependent time-frequency representations, by adapting their functional form to t the signal being analyzed, ooer many performance advantages over conventional representations. In this paper, we propose a simple, eecient technique for continuously adapting time-frequency representations over time. The procedure computes a short-time quality measure of the representation for a range of val...

Energy efficiency is one of the critical issues in Wireless Sensor Networks (WSNs) due to limited capacity of batteries of its sensor nodes. This paper investigates the impact of dynamic scaling of parameters such as modulation scheme, voltage or frequency which reduces energy consumption of sensor node. The performance is evaluated mathematically for scaling of voltage and frequency dynamicall...

—A time-frequency approach for improved instantaneous frequency estimation of noisy signals has been proposed. This approach is based on the averaged multiple time-frequency distribution obtained by using L-spectrograms with different values of the scaling parameter L. The L-spectrogram with low value of L is characterized by large bias and low variance, while higher L decreases the bias and in...

in this paper, we develop an inventory model for perishable items with random lifetime in a two-echelon production-distribution system. there is a manufacturer at the first stage that produces its product with a constant rate. deterioration in this stage is modeled via a two-parameter weibull distribution. at the second stage, the retailer places the order and receives the product instantly. th...

We present high frequency measurements of the diagonal conductivity of a two-dimensional electron system in the integer quantum Hall regime. The width of the peaks between QHE minima is analyzed within the framework of scaling theory using both temperature (1"100}700 mK) and frequency ( f)6 GHz) in a two parameter scaling ansatz. For the plateau transition width we "nd scaling behaviour for bot...

This article studied static deflection, natural frequency and nonlinear vibration of a clamped-clamped microbeam under discontinues electrostatic actuation. The electrostatic actuation was induced by applying AC-DC voltage between the microbeam and electrode plate. In contrast to previous works, it was assumed that length of the electrode plate was smaller than that of the microbeam. In additio...