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Energy harvesting from ambient radio frequency (RF) radiation is an efficient approach to provide wireless energy replenishment for mobile devices. At the same time, introducing active/sleep modes in base stations (BSs) is an effective method to save the energy consumption of cellular networks. However, the performance of the two techniques would be dependent and interact with each other if both of...
Various fashion theories have been proposed to explain how fashion works and why it works that way. However, there is little research empirically examining fashion designers' influences even though the benefit of understanding this field is significant. Unlike many other innovation domains such as patents where citations are explicit, a fashion designer hardly claims that s/he is influenced by others...
A novel transient differential protection based on approximation and z-transform theorems is proposed in this paper. The differential function relates to time is firstly approximated to convolution of the projection of differential operator and the function itself, subsequently the digital equation of transmission line is established. The z-transform is employed to obtain the solution of the sampling...
The flux-current characteristic of the voltage transformer plays an important role for non-linear Ferromagnetic analysis. The disadvantage of traditional excitation curve fitting method using the model of polynomial terms lies in that the linear part fitting is not perfect, while, the non-linear part has the good fitting results, which is not accord with the PT excitation characteristic. With fitting...
Frequency evaluation is an important but time-consuming task for power system operation. Conventional frequency response analysis methods were not suitable for fast frequency evaluation (FFE) due to their weakness in heavy computation load or poor accuracy. A new direct current loadflow based power system frequency response analysis method (DFR) for FFE was proposed in this paper. It reduced complexity...
In this paper a model is presented to explore the relationship between organizational culture, social capital, absorptive capacity and knowledge integration capability. Through theory analysis, the research framework was built and structural equation model was constructed. Then an empirical research was carried out based on a sample of 309 Chinese enterprises. Research results proved that organizational...
A novel scheme and algorithm of differential protection, which employs not only the power frequency component but the transient components based on distributed parameter line model, is proposed, as well as the distributed capacitive current is taken into account accordingly. The operating travelling waves Fcom and Bcom are defined as the forward and backward travelling wave that calculated with the...
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