A three-dimensional affine transformation method employs ALBTM (a three-dimensional affine model based on line feature) to express the relationship between two-dimensional space and three-dimensional space, and the specific mathematical expression of ALBTM is Sax=C1AX+C2AY+C3AZ, Say=C5AX+C6AY+C7AZ, .....
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One kind of soil nail pullout test box, comprising: a test box body, the left and right sides (ie soil nails tail and front) were provided with a convex body connected to pass this test case of a first chamber and an additional second additional chamber, the test box body and said first additional s.....
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The present invention relates to a piezoelectric ceramic transformer down new structure and preparation methods. It uses the input and output of a series arrangement of the electrical resonance of the piezoelectric ceramics, the low voltage at the output terminal and the output electric power to obt.....
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