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This study was to systematically comprehend water quality status and its spatial pattern in Yancheng region, north of Jiangsu Province. According to the principle of fuzzy synthetic evaluation and GIS technology, water quality of the Yancheng region was analyzed based on 5 parameters which were selected from 39 monitoring sections. The spatial patterns of evaluation results of regional water quality...
Smart substation or digital substation has become a trend of development. The Ethernet digital quantity input digital meter has become an important electric energy metering device in the digital substation by using of electronic voltage current transformer. In this paper, the smart substation related key technologies and the digital measurement system and its calibration method was researched, and...
Digital power meter is widely used in smart substation, the workload of On-site calibration of digital power meter exponential growth. How to solve a lot of power table fieldwork accurately and easily make the remote online calibration study became the Necessary research project. This paper carried out for the digital meter calibration technology research, analyzes digital power meter Line Inspection...
In this paper, we mainly focus on the metrological issues of such error parameters as EVM (Error Vector Magnitude), and address technical solutions on: 1. periodical continuity of digital modulated baseband waveforms with finite length; 2. fundamental digital modulation error settings based on error symbol design. This system can be applied to calibrate VSA (vector signal analyzer), and simulations...
A self-calibrating decade inductive voltage divider with coaxial-cable winding is designed for voltages up to 1000 V and frequencies from 50Hz to 1000Hz. Coaxial-cables are used for the ratio winding to minimize the influence of the internal capacitance currents. A reference winding is added to conduct the self-calibration. Meanwhile, an intercomparison between CEPRI and NIM is done to evaluate the...
In this paper, a new fast intra prediction mode decision based on statistics for AVS-M is put forward. On the foundation of the method, early termination for intra prediction is carried out and computation is substantially reduced. The simulation results of all I-frame coding show that the technique speeds up the encoding process without loss of coding PSNR and bitrate efficiency.
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