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Equations of motion of a structure under multidimensional seismic excitations are established based on dynamics and kinematics. The seismic excitations considered include two translational components in horizontal and a rotational component about vertical. The dynamics of a structure under such excitations is much more profound than usual expectations sated by conventional theories; the new presented...
The direct-sequence spread-spectrum(DSSS) signals are usually transmitted at very low signal to noise ratio(SNR) in Cognitive Radio(CR) system, and the classic energy detection method is not effective enough to do the detection. In this paper, we proposed an autocorrelation estimation based detection method. The method firstly searches the autocorrelation peaks that may appear at integer times of...
In Cognitive Radio (CR) networks, it is common that the spectrum holes are too narrow to support high-speed communications. Discontinuous Orthogonal Frequency Division Multiplexing (DOFDM) is a good way for a secondary user to access several spectrum fragments simultaneously with one Radio Front (RF). In this paper, a novel Channel Characteristic Aware Spectrum Aggregation (CCASA) algorithm which...
Due to the process simplicity, the low cost, and the accessibility of scaling down the feature size, colloidal lithography has drawn a great deal of attention once being developed. In this work we succeeded in fabricating asymmetric heterogeneous arrays of metallic NPs and asymmetric nanoshells via stepwise angle-resolved colloidal lithography. The present approach is independent of the sphere sizes...
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