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Background:
As compared to treatment of aortic stenosis (AS), transcatheter aortic valve replacement (TAVR) using the commercially available valves to treat pure aortic regurgitation (PAR) has a lower device success rate and higher complication rates.
Aims
The study compared the acute results between TAVR using a novel noncoronary sinus pivot implantation (NCPI) method and that using the conventional...
Normally the protection relay tracks the power system frequency in real time. It shall provide precise frequency measurement and adjust its sampling frequency according to the system frequency to ensure the accuracy of protection functions. So the frequency estimation is a fundamental function for the protection relay. This paper analyzes the basic principle and the performance of the conventional...
Shanghai World Expo 2010 starts on May 1st 2010, lasting for 184 days, with estimates of visitors being 70 million. Average daily expectancy of visitors is approximately 400,000, and on the peak days it is expected to reach up to 800,000. The purpose of this paper is to explore the inherent principles of the varying visitor flow at big events such as Expo, and to propose the strategies which can help...
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