Earlier this month, an American senator called on President Obama to hike taxes on solar panel imports coming from China. The move underscored what could be growing tension between Chinese and American companies often competing for the same dollar. The relationship may have gotten a bit rockier this past week as American Semiconductor accused Chinese wind turbine manufacturer Sinovel of industrial espionage. The Massachusetts company, which recently went through a large round of layoffs, says the Beijing firm hired someone to expose its technology.