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The dispersion functions of Rayleigh waves are theoretically deduced in layered half-space, which consist of elastic and porous layers. Different with the Rayleigh waves of elastic half-space, the dispersion function changes when the porous layer exists, and relates with the position of porous layers. The dispersion functions are given in cases of the porous layers locating at different positions...
Video-on-demand service is becoming more and more attractive and it also leads to rapidly rising in energy consumption. Traditional batching transmission scheme can reduce the transmission power consumption but it inevitably causes some delay. On the contrary, traditional patching scheme can provide real time service to meet user requests but it will generate many unicast patching streams when a lot...
This paper adopts a parallel system where two three-level neutral-point-clamped (NPC) inverters connect both ac and dc sides directly considering compact size, low cost, simplicity and easy expandability. But there is a potential zero-sequence circulating current (ZSCC), when the space-vector modulation method is used in the non-isolated system, then a control strategy for the ZSCC is present. The...
A novel power clamp circuit which has a good immunity to mis-triggering is proposed in this paper. The proposed circuit has a separate detection component and delay component, so that it can distinguish the ESD event and fast-power-on condition, while it has enough turn-on time during an ESD event. Simulation results verify that the proposed circuit has enhanced ability to discharge static charges...
In order to overcome the limit of traditional methods in image cast detection, a new cast detection approach with robust performance is presented. The algorithm by using digital image analysis is used to analyze the characteristics of the image itself. Especially the algorithm introduces image texture information to cast factor K. The new technique of evaluating cast detection not only is able to...
In order to study the power loss caused by the truncation error, a range of operating points is proposed, during which the misjudgments caused by the truncation error occur. The span of the range of operating points directly decides the amounts of tracking loss. From this point of view, the Perturbation and Observation (P&O) Method and Incremental Conductance (INC) Method are compared. Eventually,...
On the research of the economic effects of national debt, the Ricardo equivalence proposition(REP) is definitely the core issue and has been brought far-reaching influences as well. The REP has a very important policy implication, that is, the government debt failed to bring any changes of the aggregate social demand, and hence no changes to the national income either. To say it more clearly, if the...
Open-short-load (OSL) compensations are the most popular correcting technique used in impedance measurement instruments for minimizing measurement errors before outputting the final results. This paper presents a practical OSL compensation model for a new developed bipolar bioimpedance spectrometer (BIS) system. The experiment shows that after the OSL compensation, the mean error of impedance magnitudes...
The use of doubly fed induction generators (DFIG) in large wind turbines has become quite common over the last few years. However, DFIG are very sensitive to grid disturbances, especially to voltage dips, therefore low voltage ridethrough(LVRT) technology for DFIG becomes one of the critical technology in the uninterrupted operation of wind power generation. In order to help the study of low voltage...
In MW wind power generation system(WPGS), This paper analyzes the rotor flux oriented vector control theory for permanent magnet synchronous generator (PMSG), a control strategy of grid connected based on adaptive resonant regulator the method described a PLL-based speed and position controller for PMSG drives. 20 KW PMSG wind power system is constructed in the laboratory, which proves the validity...
A charge-based silicon nanowire FET (SNWT) compact model has been developed. For the first time, inversion charge of SNWT with arbitrary doping concentration is described by an accurate equation including the effects of doping and volume inversion. Analytic drain current, transconductance, output conductance, terminal charges and capacitance are all physically derived and compared with numerical simulation...
High-stability, high-accuracy low-dropout (LDO) voltage regulators are presented. The proposed LDOs make use of the slow-rolloff frequency compensation scheme which can enhance the stability, increase the loop gain and unit-gain frequency (UGF). This scheme is realized by introducing a dominant half-pole by virtue of three zero-pole pairs and a low-frequency pole. Post-layout simulation results show...
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