For instance, in the direct 3-D CT image reconstruction, the calculating scale, the calculating complexity and freedom of parameters go far beyond the processing capability of array processor used in 2-D medical CT.

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If average values before or after catastrophe point when the pressure at both ends reduces exceed the threshold value, judging that there is leak and positioning: calculating approximate wavelet transformation coefficient of pressure data at both ends, initializing searching interval, calculating a signal time delay value corresponding to approximate wavelet transformation coefficient in the searching interval from maximal scale N; converting the time delay value under scale N to that under N-1 by geometric proportion relation; updating the searching interval, repeating above processes until the scale is 0 and positioning based on the time delay value.

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The main research tasks and results are as follows:(1) Through comparing the stress intensity factor of compact tension specimen calculated by finite element software with the theoretical value, the feasibility of calculating fracture parameters of crack tip in ABAQUS software was verified.(2) The relationship between the elastic modulus of the material and research scale was studied based on deriving the cohesive stress theory and other relevant theories. And the elastic modulus of the material on meso-scale was determined.(3) Global model and sub-model of the finite element were built in th...e macro-scale, and stress-strain field nearby the crack tip was analyzed, and the results show that the detailed stress-strain in the crack tip could be obtained by using the sub-model technique.(4) In meso-scale, the crack growth model was also established by assuming the crack propagating along the grain boundary, and the detailed stress-strain field in the crack tip was obtained.(5) The effect of crack length on Von Mises stress, and maximum principal stress and strain was analyzed in meso-scale when equivalent KI equals 30MPa.m1/2. And the results show that except for crack tip area, the stress-strain distribution in whole specimen is not affected.

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calculating：計算的

calculating scale 計算尺 | calculating 計算的 | calculation based on demand factor 需用系數(shù)法

large-scale sites：大型場地

landscape plantings, calculating water景觀種植用水量的計算 | large-scale sites 大型場地 | layout and surveying 布局和測量

landscape plantings, calculating water：景觀種植用水量的計算

landscape planning strategies 景觀規(guī)劃對策 | landscape plantings, calculating water景觀種植用水量的計算 | large-scale sites 大型場地