Electromagnetic interference effectiveness

Ethylene-vinyl acetate Fetterman [37] reinforced compounded ethylene-vinyl acetate (EVA) copolymer by using short hbers and found that silane coupling agents were effective at establishing improved hber-matrix adhesion. Das et al. [38] prepared carbon fiber-filled conductive composites based on EVA and studied the electromagnetic interference shielding effectiveness of the composites. 

X-rays Electromagnetic radiation with wavelengths ranging between 10"10 and lO cm. X-rays diffraction A physical method for determining the structure of crystalline solids by exposing the solids to X-rays and then studying the varying intensity of the difracted rays due to interference effects. 

The MWCNT-filled polystyrene composites have good electromagnetic interference shielding properties (Snow and Perkins, 2005). The shielding effectiveness of MWCNT-filled composites was frequency independent, and increased with the... 

Electromagnetic interference (EMI) refers to the interaction between electric and magnetic helds and sensitive electronic circuits and devices. EMI is predominantly a high-frequency phenomenon. The mechanism of coupling EMI to sensitive devices is different from that for power frequency disturbances and electrical transients. The mitigation of the effects of EMI requires special techniques, as will be seen later. Radio frequency interference (RFT) is the interaction between conducted or radiated radio frequency helds and sensitive data and communication equipment. It is convenient to include RFI in the category of EMI, but the two phenomena are distinct. 

In shielding for radio-frequency and electromagnetic interference an electroplated coating may -not be necessary. Highly effective performance can be obtained with deposits of thickness as low as 2 to 3 /on and these can be applied economically by electroless processes, which give very uniform thicknesses of deposits even in recessed areas. 

Electromagnetic interference shielding effectiveness of about 18 dB was achieved with 10 vol% MWCNT-PMMA film which was found to be primarily an EMI absorbing composite material. Figure 7.15 shows the variation of EMI shielding effectiveness due to reflection... 

The correlation functions (28) described by the field operators are similar to the correlation functions (6) and (20) of the classical field. A closer look into Eqs. (6), (20), and (28) could suggest that the only difference between the classical and quantum correlation functions is that the classical amplitudes E (R, f) and E(R, f) are replaced by the field operators E (R, t) and eW(R,(). This is true as long as the first-order correlation functions are considered, where the interference effects do not distinguish between the quantum and classical theories of the electromagnetic field. However, there are significant differences between the classical and quantum descriptions of the field in the properties of the second-order correlation function [16]. 

It follows from (187) that the dependence of G on the phase a and on the electromagnetic field amplitude leads to two different effects. First, the oscillatory dependence G( s) is the standard mesoscopic interference effect similar to that in static electron interferometer [101]. Another type of oscillating dependence G(A) is completely caused by the time-varying field. The dependence of the conductance on the field intensity P is shown in Fig. 21. 

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