Objective:To optimize the decompression scheme of conventional air diving based on the data of 5 factors.Methods:Five factors, i. e. bottom material, water temperature, water current velocity, individual susceptibility to decompression sickness, and labor intensity, associated with decompression safety were calculated and analyzed, to select the most optimized decompression scheme.Results:A modified formula for the duration of underwater operation was proposed, and it was proved safe and reliable during the underwater construction of railway bridge pier.Conclusion:Based on synthetical consideration of various factors, i. e. bottom material, water temperature, water current velocity, individual susceptibility to decompression sickness, and labor intensity, an optimized decompression scheme was gained for balancing the decompression efficiency and the safety of divers by modifying the time duration of underwater operation.

Objective:To optimize the decompression scheme of conventional air diving based on the data of 5 factors.Methods:Five factors, i. e. bottom material, water temperature, water current velocity, individual susceptibility to decompression sickness, and labor intensity, associated with decompression safety were calculated and analyzed, to select the most optimized decompression scheme.Results:A modified formula for the duration of underwater operation was proposed, and it was proved safe and reliable during the underwater construction of railway bridge pier.Conclusion:Based on synthetical consideration of various factors, i. e. bottom material, water temperature, water current velocity, individual susceptibility to decompression sickness, and labor intensity, an optimized decompression scheme was gained for balancing the decompression efficiency and the safety of divers by modifying the time duration of underwater operation.

Objective To seek an effective surgical procedure to treat patients with the varying degrees of breast ptosis and micromastia.Methods Patients were classified into Ⅰ-Ⅳ degrees based on different breast ptosis,and treated by different methods.Degree Ⅰ was treated with implanting prosthesis to the post-pectoralis major space; degree Ⅱ patients were repaired with avulsion of deeper mammary gland and pectoralis major and hanging fixed breast tissue,based on the degree Ⅰ procedure; degree Ⅲ was fixed with breast tissue flap,excised redundant epidermis by the method of double-rings and the complex of nipple and areola was shifted,based on the degree Ⅱ procedure; degree Ⅳ was repaired with implanting prosthesis and the method of lines to hanging fixed breast.Results In 116 cases of this study,there were no hematoma,infection and nipple and areola necrosis by the combined strategies.The follow-up period after the surgery was 6-31 months (mean 13.3 months).All cases had voluptuous and upright breasts,rectified breast ptosis,with the normal sense of nipple and areola.Conclusions For breast ptosis and hypoplasia,the combined strategies have better clinical therapeutic effects.