A | PARIS -- Three French airports in the cities of Lyon, Toulouse and Lille were evacuated on Wednesday following security alerts, police said. They were the latest in a series of evacuations around France this week that included popular tourist attractions the Louvre Museum and Versailles Palace following the killing of a teacher in the northern city of Arras on Friday. All the threats up to Wednesday proved false. Emailed threats of an attack were received at the airports in the southeast city of Lyon, the southern city of Toulouse and Lille in northern France, police said, without elaborating on the contents of the emails.The prefecture for the Lyon region said Wednesday that the threat at the airport was a false alarm and reminded the public that communicating false information can lead to prison and a heavy fine.Meanwhile an abandoned piece of luggage briefly disrupted operations at the airport in the Riviera city of Nice, the airport said. The Louvre Museum and the Palais de Versailles were evacuated Saturday, and the royal palace was again evacuated Tuesday. A high school in Arras, in northern France, was evacuated on Monday ahead of a moment of silence in schools around France, three days after the murder of a teacher at the Arras school allegedly carried out by a former student and suspected Islamist extremist. France has raised its threat alert to its highest level. The anti-terrorism prosecutor said on Tuesday that the suspect declared his allegiance to the so-called Islamic State group before the fatal stabbing.。 可转债双低策略是近几年非常流行的量化策略，核心思想是买入"价格低+溢价率低"的可转债，等待价值回归。但很多人不知道如何正确地回测这个策略。先说结论：可转债双低策略的回测需要同时考虑价格、溢价率、信用评级、剩余期限等多个因素，简单的"按双低值排序买入"并不够，需要加入过滤条件和风控逻辑。双低值的计算双低值=可转债价格+转股溢价率×100比如一只可转债价格110元、转股溢价率20%，双低值=11...。
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