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The relationship of display luminance and driving frame frequency were studied of the triode CNTs-FED and the double-gated CNTs-FED respectively. The fluctuation of effective energy consumption was introduced for understanding why FED luminance property varied with the change of frame frequency.
Due to the impact of higher and higher frequencies, the Shielding Effectiveness (SE) characterisation of shielding gaskets at frequencies above 1 GHz is needed for on board shielding applications. Although the standard IEEE Std 1302™ - 2008 is covering the characterisation of shielding gaskets up to 18 GHz, the methods proposed in this standard are not applicable for these thin and small...
This paper presents an in-situ method for measuring both electric and magnetic properties of Hawaiian volcanic soil for GPR applications in a broad frequency range from 50 MHz to 1GHz. For the in-situ probe, we combined two monopole antennas with parasitic elements into one piece to achieve reflection (S11) and transmission (S21) measurements simultaneously. Finally, the in-situ probe has a shape...
Ground penetrating radar (GPR) is widely studied for detection of landmines and mine-like targets; GPR is particularly useful for detecting minimum metal mines which are harder to detect using traditional metal detection devices alone. In order to expand the phenomenology for GPR, careful measurements of homogeneous and heterogeneous soils with and without targets (landmine simulants and metal objects)...
A FBG-GMM dynamic strain measurement setup with ferromagnetic circuit was established based on the magnetostriction characteristic of Giant magnetostrictive material (GMM) and the susceptibility of fiber Bragg grating (FBG) to strain. This system was constructed using the FBG dynamic strain demodulating scheme of optical filter linear sideband. The finite element analysis and experimental result show...
A novel method based on optical fiber sensors to realize the identification of characteristic frequency of Acoustic Emission (AE) signal is proposed. The system is structured by a ring optical fiber Sagnac interferometer which is used to detect the ultrasonic waves. The optical fiber sensor was fixed on the experimental material; press the experimental material with mechanical device, signals collected...
Ionic polymer-metal composites (IPMCs) are electroactive materials that bend under an applied electric field. Existing work has typically dealt with the control of IPMC actuators themselves. In this paper we investigate the stabilization of an inverted pendulum on a cart using an IPMC actuator. Different from the traditional setting of cart-pendulum systems, we require that the voltage on the IPMC...
To estimate how close the estimates of different experts are, W. J. Tastle and M. J. Wierman proposed numerical measures of dissention and consensus, and showed that these measures indeed capture the intuitive ideas of dissent and consensus. In this paper, we show that the Tastle-Wierman formulas can be naturally derived from the basic formulas of fuzzy logic. We also show that these formulas can...
Material samples were prepared consisting of silica particles in an epoxy matrix. The generic compound contained a large amount of micrometric silica (e.g. 60% wt.) and a few % of nanosilica. Investigation of the microstructure of the samples showed that indeed the microcomposites exhibited a nanostructured morphology. Dielectric spectroscopy was used to compare the behavior of materials differing...
Ferroelectrics and multiferroics are materials of choice when it comes to development of agile microwave components. Due to the reach variety of physical properties (tunable dielectric, acoustic, optical, magnetic) they offer integration possibility of multiple microwave functionalities on a single substrate. Excellent dielectric properties of these materials allow high power handling capability,...
This paper presents complex permittivity and permeability measurements and reflection analysis of a selection of iron-loaded absorbing materials. A precise transmission-reflection based waveguide measurement technique was used to accurately characterize the materials in the 2 to 40 GHz frequency range. Based on the individual absorption spectra the materials were combined to form a composite structure...
We report a study on the relaxation behavior of the real part of the permittivity. We also discuss the loss tangent of a class of materials in the microwave to millimeter band of frequencies. For relaxation response we show that the permittivity is a monotonic decreasing function of frequency. Also, for many low-loss ceramics, glasses, crystals, and solid polymers we found that the loss tangent increases...
A precise technique for broadband material characterization, using a whispering-gallery-mode (WGM) resonator, is proposed. The resonant perturbation method is successfully applied for extracting both the dielectric constant and loss tangent of materials over a wide frequency band. Two experimental prototypes are fabricated and employed over the K-band where consistent results are obtained with a maximum...
The potential application of polymer/ceramic capacitors at a higher frequency range is explored through a detailed characterization of several form factors of embedded capacitors. S-parameters of embedded decoupling capacitors using two different types of embedded capacitance material were measured from 500 MHz to 12 GHz. The effect of different geometries, electrode sizes, and materials are demonstrated...
Nano and micro based epoxy samples have been evaluated for predicting their electrical performance in outdoor high voltage insulation applications. Scanning electron microscopy (SEM) is used to evaluate the shape and the dispersion of the filler material. Space charge characterization and the role of the interface in these materials is evaluated using dielectric spectroscopy on these samples. The...
In this paper we have provided analysis of carbon nanotube (CNT) based Through Silicon Vias (TSVs) for package interconnects. The package interconnects are fundamental bottlenecks to achieving high performance and reliability. We have provided electrical modeling and performed simulations on TSV with copper and carbon nanotubes. The results from the CNT-based TSVs were greatly superior to conventional...
QCM(Quartz Crystal Microbalance) is a piezoelectricity sensor with nanogram precision. However twice measurements of no-load and a load are necessary in the tradition, which will result in frequency errors when environments(such as temperature and humidity) changes. This paper affords a new design of double-core QCM for solving the time-delay problem in the QCM traditional measuring method. Reference...
The modulated scatterer technique (MST) has shown promise as an embedded sensor technique for materials characterization and flaw detection. MST is based on illuminating a loaded scatterer/probe, usually a dipole antenna loaded with a PIN diode, with an electromagnetic wave. By detecting the backscattered (reflected) wave, information about the material properties in the vicinity of the probe can...
This paper shows measurements of the shielding effectiveness of two commonly used building materials, wood and marble. Of specific interest is the shielding effectiveness of these materials in the 900 MHz and 2.4 GHz regions, the operating frequencies of ZigBee, wireless personal area networks and wireless local area networks. A relatively new method for shielding effectiveness using the reverberation...
A simple and cost-effective experimental setup for measuring the transmission coefficient of whispering-gallery (WG) mode dielectric resonators up to the mm-wave band is presented. The proposed setup consists of a sweep generator, a spectrum analyzer and a PC with a General Purpose Interface Bus (GPIB). The major advantage of such arrangement lies in the ease of measurement without standard calibration...
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