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In wireless sensor networks where nodes are powered by batteries, it is critical to prolong the network lifetime by minimizing the energy consumption of each node. In this paper, the cooperative multi-input-multi-output (MIMO) and data aggregation techniques are jointly adopted to improve energy efficiency in a cluster based wireless sensor network. Using the energy model derived, the average energy...
Distributed beamforming has the great potential of performance improvement in wireless networks while the carrier synchronization overhead will reduce its performance gain. In this paper the effects of carrier synchronization on link throughput of distributed beamforming is studied. The expressions of the frequency and initial phase used by each cooperative node are derived for the existing round-trip...
Levitation force is an important technical index of linear induction motor. This paper presents a kind of device which can supply suspension force for hybrid excitation electromagnetic actuators, and calculates the electromagnetic levitation force with 3D field finite element method. The optimization soft package iSIGHT-FD is used to design the structure of the system to gain the largest suspension...
In order to investigate the impacts of the integration of wind farms into utilities network, it is necessary to analyze the transient performances of wind power generation systems. In this paper, an assessment of the impact that the different representations of drive-train dynamics have on the electrical transient performances of doubly fed induction generator (DFIG) wind turbines with different operationally...
As a new type of induction machine, brushless doubly-fed machine (BDFM) has excellent speed regulation performance and can run in the condition of variable-speed-constant-frequency power generation. It has good applicable potentials on energy-saving-speed-adjusting motors and wind power generation system, but its structure and operating principle are more complex. To study the effect of different...
The paper investigates the improvement in sensorless vector control of induction machines through the use of a non-linear feedback integrator embedded in a standard rotor flux model reference adaptive system (MRAS)-based observer. The feedback integrator compensates for drift and DC-offset and is capable of open loop flux estimation down to frequencies below 0.1 Hz. The paper presents experimental...
Supporting cells in the inner ear sensory epithelium are most likely hair cell progenitors. In an effort to establish an in vitro model system of hair cell differentiation, we developed immortalized epithelial cell lines by transferring the tsA58 allele of the SV40 large T antigen oncogene into neonatal rat utricular supporting cells using a retrovirus. The established cell lines have been stably...
Trace levels of molybdenum can be determined by differential pulse polarography, based on the catalytic effect of the molybdenum-PAR [4-(2-pyridylazo)-resorcinol] complex on the reduction of sodium bromate. The powerful oxidant, sodium bromate, increases the peak current for the reduction of the molybdenum-PAR complex by about 5 times. Under optimal conditions, molybdenum at the μg l -1...
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