Artificial intelligence technology bellwether Nvidia overcame a wave of tariff-driven turbulence to deliver another quarter of robust growth amid feverish demand for its high-powered chips that are making computers seem more human. The results announced Wednesday for the February-April period came against a backdrop of President Donald Trump’s on-again, off-again trade war that has whipsawed Nvidia and other Big Tech companies that have been riding AI mania to propel both their revenue and stock prices increasingly higher.