The principle of borehole elasticity modulus measurement and results are presented,and the unloading relaxation depth is estimated. The depth is compared with that obtained by single-hole sonic velocity monitoring.

(3) The model predicted erosion rates were positively related to both the plow depth d and relaxation depth H, but inversely related to both γ and the particle size correction factor P. moreover, the model was more sensitive to d and p than to H and γ.

Borehole elasticity modulus measurements were conducted in five holes drilled from the excavated rock foundation surface of Xiaowan Hydropower Station's arch dam,situated on Lancang River,in order to evaluate the unloading relaxation depth due to excavation blasting.

These equations describe a phenomenon similar to the branch imbalance (or charge imbalance) in superconductors, and determine the relaxation depth of the pressure gradient in superfluid helium-3.

Based on the exponential depth distribution of radionuclides, the values of their migration parameters as relaxation depth, migration rate and retardation factor were calculated.

Relaxation depth ranged from 0.9 cm in the polar climate environment up to 20 cm in the temperate one.

The sonic wave measuring results of high rock slope at the boatlift and temporary shiplock of Three Gorges Project are presented. It is shown that the relaxation depth of rock mass at the slope is varied because of the different controlling factors. The relaxation can be classified as surface relaxation, shallow relaxation and deep relaxation. The average depths are 0.30.5m, 2.03.0m and above 5.0m for the three kinds of relaxation.

Measuring the ~ ~137 Cs reference inventory in study area accurately and establishing quantitative models for converting ~~ ~137 Cs measurements to estimates of soil redistribution rates are two key questions. The spatial variation of erosion and deposition of Black Soils on a sloping cropland in Northeast China was studied using ~ ~137 Cs tracer technique. In filed, three transects perpendicular to the contour were set and five slope units for each transect were located, including a summit, shoulder-slope,...

Measuring the ~ ~137 Cs reference inventory in study area accurately and establishing quantitative models for converting ~~ ~137 Cs measurements to estimates of soil redistribution rates are two key questions. The spatial variation of erosion and deposition of Black Soils on a sloping cropland in Northeast China was studied using ~ ~137 Cs tracer technique. In filed, three transects perpendicular to the contour were set and five slope units for each transect were located, including a summit, shoulder-slope, back-slope, foot-slope and toe-slope, respectively. Field measurements and model simulating were used to estimate Bomb-derived ~ ~137 Cs reference inventory in study area. The rates of soil erosion and deposition were estimated using the mass balance model incorporating soil movement by tillage. In order to compare the sensitive of parameters, we discussed the relationships between percentage loss in ~ ~137 Cs inventory and erosion rate by the mass balance model for different values of various parameters. The results showed that: (1) the surveying value (2376.81±108.46Bq/m2) was very close to the predicted one(2318.4 Bq/m2) by the model for estimating bomb-derived ~ ~137 cs reference inventories; For the areas far away from nuclear proving ground of the Northwest China, the predicted conclusions were more reasonable. (2) The ~ ~137 Cs inventories in shoulder-slope and back-slope were the lowest among five geomorphic positions and soil suffer erosion seriously with the rate of erosion of 33.56t/(hm2·a) and 21.67t/(hm2·a); Foot-slope and toe-slope behaved soil deposition obviously and the rate of deposition were-4.93t/(hm2·a) and-24.61t/(hm2·a), respectively. (3) The model predicted erosion rates were positively related to both the plow depth d and relaxation depth H, but inversely related to both γ and the particle size correction factor P. moreover, the model was more sensitive to d and p than to H and γ.

Objective:To study the feasibility,safety and practicability of epidural anesthesia in children's lower abdominal surgery by laparoscope.Methods:sixty cases(4-10 years old,ASAⅠ-Ⅱ)received appendectomy or the inner ring ligation of the hernia by laparoscope were randomly divided into two groups.Group A:30 cases,received ketamine and midazolam intravenons anaesthesia with endotracheal intubation.Group B:30 cases,taken continuous epidural anesthesia after basal anesthesia with assistant respiration by mask and...

Objective:To study the feasibility,safety and practicability of epidural anesthesia in children's lower abdominal surgery by laparoscope.Methods:sixty cases(4-10 years old,ASAⅠ-Ⅱ)received appendectomy or the inner ring ligation of the hernia by laparoscope were randomly divided into two groups.Group A:30 cases,received ketamine and midazolam intravenons anaesthesia with endotracheal intubation.Group B:30 cases,taken continuous epidural anesthesia after basal anesthesia with assistant respiration by mask and supply of oxygen.The parameters of HR、SBP、DBP、SpO_2、P_(ET)CO_2 were monitored continuously during the operations.Results:All of the patients were quiet during the operations and the relaxation depth of abdominal muscle was good.The effect of anaesthesia was satisfactory.The parameters of HR、SBP、DBP、P_(ET)CO_2 increased a little after establishing pneumoperitoneum(P<0.05),with no significant differences between the two groups.which returned to normal level in 10 minutes after deflation.The SpO_2 was in the range from 98% to 100%.The average recovery time of the group A was longer than group B(P<0.05).Conclusions:Continuous epidural anesthesia is a feasible and effective method in some children's short time lower abdominal surgery by laparoscope.It has satisfactory effect,little influence on breath and circulation,and short recovery time after operation.