New York Times: A company here that is partly owned by the Chinese government has quietly purchased a 5.1 percent stake in the only American-owned provider of enriched uranium for use in civilian nuclear reactors. The company that bought the stake, the Noble Group, is the world’s second-largest commodities trading and logistics company after Cargill and is based here. One of its minority owners is the Chinese government’s sovereign wealth fund. The American company is USEC, which is based in …