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According to the soil test requirements, a new dynamic & static triaxial apparatus is developed. This apparatus can replace the traditional dynamic triaxial apparatus and static triaxial apparatus to accomplish the testing task perfectly. The implementation of the servo loading is the key of dynamic & static triaxial apparatus. The electro-hydraulic servo loading system is adopted to accomplish the dynamic & static loading of the force and displacement after comparing the advantages and the disadvantages of the hydraulic, pneumatic and electric loadings. In order to resolve the oil pressure fluctuating problem with dynamic loading and low efficiency problem with static loading, a design project of the hydraulic system with the accumulator group and constant pressure pump is proposed. The correctness of the project has been verified by mathematical modeling and simulation. [ABSTRACT FROM AUTHOR]

Objective: To investigate the feasibility for judging the postoperative lymph node metastasis of esophagus cancer patients with pN0 stage by detecting the protein expression of metastasis-associated protein 1 (MTA1)., Methods: Immunohistochemistry was used to detect the expression of MTA1 protein in lymph node of esophageal squamous cell carcinoma (ESCC) with pN0 stage., Results: (1) There were no significant differences in age, gender and differentiation among the lymph node metastasis (P > 0.05), but not with pT stage (P < 0.05; χ(2) = 13.29). (2) There were no significant differences among the expression of MTA1 protein and age, gender and differentiation (P > 0.05), but not with differentiation and pT stage (P < 0.05; χ(2) = 18.61). Both stages pT1b and pT3 had higher expression of MTA1 protein than stage pT1a (P < 0.05; χ(2) = 25.54). (3) The curve of lymph node metastasis showed that the patients with no/lower MTA1 protein expression had a lower metastasis rate than those a higher MTA1 protein expression (P < 0.05; χ(2) = 16.63). (4) The results of multivariate analysis confirmed that T status and MTA1 protein over-expression were independent risk factors for pN0 stage ESCC., Conclusion: Detecting MTA1 protein expression is helpful for judging the lymph node metastasis of ESCC patients with pN0 stage. And its over-expression may used as a guide in the decision-making of postoperative adjuvant therapy.