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Due to capacitor elements and inductive line impedance in power system, parallel resonance could be triggered in the presence of harmonic currents from nonlinear load, whose frequency may shift resulting from intermittent switching of the capacitor devices. So it is difficult for shunt active power filter (SAPF) to damp parallel resonance. This paper investigates parallel resonance detection with...
Traditional risk assessment methods adopt the long-term failure model of element and severity indices to characterize the failure probability and its impact on the power system respectively. However, in the actual system, the failure probability has time-varying characteristic due to the influence of the internal system and the external environment. Severity indices are formed by weighting each severity...
Data-intensive computing becomes a buzz word nowadays, where constant data for current operational processing and historical data for massive analysis are often separated into two systems. How to keep the historical data for analysis (often in a materialized view manner) consistent with their data sources (often in the operational databases) is the main problem to be solved imperatively. In this paper,...
Land use change plays vital roles in regional, social and economic development. Based on three phases of NDVI and climate images acquired in 1982, 1990 and 1998, and fuzzy rule-based classification, this paper took China as a case study to analyze spatial change of land use by combining NDVI, Landscape indices and transformation matrix. The research results indicate that land use has grown more and...
Land use change plays vital roles in regional, social and economic development and global environmental change. Based on three different phases of TM images acquired in 1992, 2000 and 2006, this paper takes Kunming in China as a case study to analyze spatial change of land use and to evaluate urban environment quantitatively by combining Landscape indices and NDVI. Following the theory of landscape...
Based on three phases TM image acquired in 1992, 2000 and 2006, this paper took Kunming in China as a case study to evaluate the urban environment quantitatively by using NDVI and green index. Due to different atmospheric conditions, seasonal changes in vegetation characteristics and other reasons, the remote sensing images captured at different time may be quite different in color and brightness...
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