Under the combined influences of special topography and the long term mining in Nanfen Open Pit Iron Mine, many large scale landslide masses appeared in heading side of stope, and tens of millions of iron mine is buri...Under the combined influences of special topography and the long term mining in Nanfen Open Pit Iron Mine, many large scale landslide masses appeared in heading side of stope, and tens of millions of iron mine is buried underside, making great economic losses. In order to guide the safety mining and increase the supply quantity, this paper through the use of MSARMA-method and the ''MSARMA evaluation and analytical system for slope stability analysis'' based on this method, which aimed at the quantitative evaluating of the slope stability before and after the actual mining below the slip mass, and the sensitivity analysis for the main influencing factor, providing scientific proof for the parameter optimization of open mine surface slope, the security and sustainable exploitation.展开更多
Objective： The purpose of the present study was to retrospectively and systematically evaluate the feasibility and safety of laparoscopic gastrectomy for gastric cancer. Methods： Research of prospective, randomized,...Objective： The purpose of the present study was to retrospectively and systematically evaluate the feasibility and safety of laparoscopic gastrectomy for gastric cancer. Methods： Research of prospective, randomized, controlled studies addressing laparoscopic gastrectomy versus open gastrectomy was screened through computer-based online system. Meta-analysis of acquired data was performed. The inverse variance method was used to test the significance of continuous data, while the ManteI-Haenszel method was used for dichotomous data. The chi-square test was used for evaluation of data heterogeneity. Homogenous data were calculated using the fixed effect model, and heterogeneous data were calculated using freedom model. Statistical data were expressed as 95% confidence interval （95% CI）. Funnel plot was used for sensitivity analysis to show potential publication bias. Results： Five papers met the inclusion criteria, 164 cases underwent laparoscopic gastrectomy and 162 cases received open gastrectomy. Meta-analysis revealed that laparoscopic gastrectomy took longer operating time and removed fewer lymph nodes than open gastrectomy （both P 〈 0.01）, but for early-stage gastric cancer, laparoscopic gastrectomy was superior to open gastrectomy in terms of blood loss and hospital stay （P 〈 0.01）. But there were no significant differences in terms of time to resumption of oral intake, postoperative complications, postoperative morbidity rate, and tumor recurrence. Sensitive analysis demonstrated that publication bias existed in all indices to different extents with the exception of lymph node. Subgroup analysis showed that for D1 lymph node dissection, laparoscopic gastrectomy took significantly reduced blood loss than open gastrectomy. Conclusion： All these findings indicate that laparoscopic gastrectomy for early stage gastric cancer is feasible and safe.展开更多
According to the data of preliminary survey, the authors established a landslide geological model,on the basis of analyses on the sensitivity of landslide, tried to simulate and calculate the landslide stability of Sh...According to the data of preliminary survey, the authors established a landslide geological model,on the basis of analyses on the sensitivity of landslide, tried to simulate and calculate the landslide stability of Shuitianba with the method of transfer coefficient when it is under different strength parameters, and study the landslide mechanism. The results show that it is sensitive to the effects of shear strength parameters of sliding zone and groundwater level on landslide stability safety coefficient, which provides reliable basis for calculation of landslide stability.展开更多
基金provided by the National Natural Science Foundation of China (No. 40972196)the Scientific Research Foundation of China University of Mining & Technology(Beijing) (No. 2010QL03)
文摘Under the combined influences of special topography and the long term mining in Nanfen Open Pit Iron Mine, many large scale landslide masses appeared in heading side of stope, and tens of millions of iron mine is buried underside, making great economic losses. In order to guide the safety mining and increase the supply quantity, this paper through the use of MSARMA-method and the ''MSARMA evaluation and analytical system for slope stability analysis'' based on this method, which aimed at the quantitative evaluating of the slope stability before and after the actual mining below the slip mass, and the sensitivity analysis for the main influencing factor, providing scientific proof for the parameter optimization of open mine surface slope, the security and sustainable exploitation.
文摘Objective： The purpose of the present study was to retrospectively and systematically evaluate the feasibility and safety of laparoscopic gastrectomy for gastric cancer. Methods： Research of prospective, randomized, controlled studies addressing laparoscopic gastrectomy versus open gastrectomy was screened through computer-based online system. Meta-analysis of acquired data was performed. The inverse variance method was used to test the significance of continuous data, while the ManteI-Haenszel method was used for dichotomous data. The chi-square test was used for evaluation of data heterogeneity. Homogenous data were calculated using the fixed effect model, and heterogeneous data were calculated using freedom model. Statistical data were expressed as 95% confidence interval （95% CI）. Funnel plot was used for sensitivity analysis to show potential publication bias. Results： Five papers met the inclusion criteria, 164 cases underwent laparoscopic gastrectomy and 162 cases received open gastrectomy. Meta-analysis revealed that laparoscopic gastrectomy took longer operating time and removed fewer lymph nodes than open gastrectomy （both P 〈 0.01）, but for early-stage gastric cancer, laparoscopic gastrectomy was superior to open gastrectomy in terms of blood loss and hospital stay （P 〈 0.01）. But there were no significant differences in terms of time to resumption of oral intake, postoperative complications, postoperative morbidity rate, and tumor recurrence. Sensitive analysis demonstrated that publication bias existed in all indices to different extents with the exception of lymph node. Subgroup analysis showed that for D1 lymph node dissection, laparoscopic gastrectomy took significantly reduced blood loss than open gastrectomy. Conclusion： All these findings indicate that laparoscopic gastrectomy for early stage gastric cancer is feasible and safe.
文摘According to the data of preliminary survey, the authors established a landslide geological model,on the basis of analyses on the sensitivity of landslide, tried to simulate and calculate the landslide stability of Shuitianba with the method of transfer coefficient when it is under different strength parameters, and study the landslide mechanism. The results show that it is sensitive to the effects of shear strength parameters of sliding zone and groundwater level on landslide stability safety coefficient, which provides reliable basis for calculation of landslide stability.
