SHANGQIU, China -- This is not the equivalent of Silicon Valley. There isn't a lab in sight or a high-tech industrial park in the area. What attracts most of the attention is a two-floor factory building with a signboard that reads "Shangqiu Sanli New Energy Demonstration." Still, this is a noteworthy place. It is healing one of China's long-standing headaches. That headache is straw, basically an agricultural waste collected from nearby farms.