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A single particle‐based confocal laser scanning microscopy was developed for the visual detection of copper ions in confined space. A fluorescence microparticle, named AuNCs/ZIF‐8, was synthesized by coating gold nanoclusters (AuNCs) onto the outer surface of zeolitic imidazolate framework‐8 (ZIF‐8). The morphology and solid‐state fluorescence property of AuNCs/ZIF‐8 were characterized by scanning...
To monitor the Electric Submersible Pump (ESP) running state, a multi-sensor down hole test system was designed in this paper. It is the important corollary equipment of the ESP. It can offer a number of detailed parameters of down hole environment. Therefore, this can raise the working reliability and utilizing efficiency of ESP. First, considering the condition of high temperature, high pressure...
The problem of detecting unknown and arbitrary sparse signals against background noise is considered. Under a fixed hypothesis-testing problem model, a scheme referred to as Likelihood Ratio Test with Sparse Estimate (LRT-SE) is proposed. The relation between the quality of the estimate and the detection performance is quantized through the Kullback-Leibler distance, which shows the performance of...
The principle of position estimation and sensorless control of a matrix converter fed permanent magnet synchronous motor (PMSM) has been reported before, where the current derivatives of motor line currents were measured by di/dt sensors to construct position signals. This paper presents a different implementation that eliminates the di/dt sensors. The current derivatives are calculated by measuring...
The high-voltage transformer substation is a special environment with high voltage and strong magnetic field. The temperatures of transmission circuitry joints in substations may increase for many reasons to initiate fire and explosion. A hierarchical clustering wireless sensor network (WSN) based on multi-agent system (MAS) is provided in this paper. Sustainable power-supplied nodes are appointed...
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