About chinese visa from Sendai for Bangladeshi citizen

I am a Bangladeshi citizen here in Japan. Now I am doind my PhD at Tohoku University here in Sendai. I am planning to apply for Chinese visa to Join a conference in China on this February. What types of document I might need for that? Can I apply for Chinese visa from Sendai without moving to Tokyo? Moreover, If I have to go tokyo, Can I get the visa in the same day I submit my application forms??? Please let me know the reply.