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In this paper, an accurate HVDC transmission system model, which includes AC system, transformer, converter, AC/DC filter, smoothing reactor and transmission line, is built up by the power system simulation software PSCAD/EMTDC. Referring to the standard testing system CIGRE Benchmark, the simulation model of the control system is established, too. The simulation result shows that this model can simulate...
A new kind of silica‐supported third‐generation dendrimers capped by 1,4‐diaza‐bicyclo[2.2.2]octane (DABCO) group‐stabilized palladium(0) nanoparticles, and their enhanced catalytic activity in Suzuki–Miyaura and Mizoroki–Heck reactions in excellent yield under mild conditions, was reported. The resulting silica‐supported dendrimer‐stabilized palladium(0) nanoparticles with a particle size of 10–20...
The Hadoop Distributed File System (HDFS) is a distributed storage system that stores large-scale data sets reliably and streams those data sets to applications at high bandwidth. HDFS provides high performance, reliability and availability by replicating data, typically three copies of every data. The data in HDFS changes in popularity over time. To get better performance and higher disk utilization,...
Power reducing in clusters has become increasingly important over the past few years. People have tried hard to reduce the power consumption of clusters. However, managing the power is more important than reducing the power. In this paper, we add power consumption to the list of managed resources and help developers to understand and control power profile of their clusters. MapReduce is an efficient...
A series of new pyran derivatives are efficiently synthesized in a one-pot four-component tandem reaction via Suzuki coupling followed by a three-component reaction from readily available 4-bromobenzaldehyde, activated methylene compounds, and carbonyl compounds. Single crystal X-ray structure of the synthesized product is presented. The versatility and efficiency of the proposed methodology has been...
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