SAR images are improved by a method for acquiring a synthetic aperture image from a sequence of periodic pulse returns where the sequence of periodic pulse returns is interspersed with interrupts, i. In some embodiments, a tube occluding mechanism is disclosed that includes a bendable occluding member for creating a force that can be applied to a collapsible tube to occlude the tube. 5 and hydrophobic degree of substitution below 0. When all requisite conditions are satisfied, the camera automatically captures the image of the document for post-processing. 7\xb0, and the ratio of the peak intensity of the plane to the peak intensity of the plane: II is 0. The greater the amount of simultaneous sound, the greater the likelihood that the party is an automated device.