Large heat input welding steel of grade 345 MPa,490 MPa have been successfully produced by oxidemetallurgy,rational Ti/N ratio,careful process design,suitable process route,which can meet the welding require-ments for 50 ~100 kJ/cm heat input.

The influence of dissolved oxygen(DO), C/N and pH on simultaneous nitrification and denitrification in the membrane bioreactor was studied.

Co-composting tests with C/N 12.

filter mud of sugarcane and tung seed meal were studied by analyzing the pattern of temperature,carbon-to-nitrogen ratio(C/N)and the seed germination index(GI)at different stages.

The distributions of C/N ratios of the organic matters in the four cores of the Yangtze river estuary are different due to the different sources and the influence of sediment grain size and circumstance.

In view of complex and multi-factor characteristics of anaerobic digestion treatment for municipal solid waste, orthogonal experiment was used to select the best technical conditions considering TS, temperature and C/N ratio.

The effect of carbon ,nitrogen resources and C/N ratio on HEP production are studied in this article,and the results show that glucose and the multi-nitrogen resources are the best carbon and nitrogen resources respectively, the best C/N ratio is 26, the composition of medium and the C/N ratio are important factors for HEP production.