| 21. | Surface tension has the dimension of force per unit length, or of energy per unit area.
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| 22. | Also, one picks a segment in the plane which is declared to be of unit length.
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| 23. | The " side centroid " comes from considering the sides to have constant mass per unit length.
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| 24. | The ribozyme acts to process the RNA transcripts to unit lengths in a self-cleavage reaction.
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| 25. | The physical model behind this method is the infinite line source with constant power per unit length.
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| 26. | As long as the rope has a non-zero mass per unit length this is needed.
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| 27. | The unit length for the grid was the kilometre; the British units were not even considered.
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| 28. | This can be found by a breadth-first search, as we let edges have unit length.
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| 29. | This vector is then normalized to unit length in order to enhance invariance to affine changes in illumination.
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| 30. | This may be more succinctly stated by realizing that directional data are in fact vectors of unit length.
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