If you are concerned that someone you know becomes incapable of managing or directing the management of his or her benefits, please call us at 1-800-772-1213 (TTY 1-800-325-0778) to request an appointment to discuss your concerns. Generally, we look for family or friends to serve as representative payees. When friends or family are not able to serve as payees, Social Security looks for qualified organizations to be representative payees. If you are a representative payee, you can complete the Representative Payee Accounting Report online.
Environmental monitoring, earth-resource mapping, and military systems require broad-area imaging at high resolutions. Often, this imagery must be acquired at night or during inclement weather. Synthetic Aperture Radar (SAR) provides such a capability. Synthetic Aperture Radar (SAR) systems take advantage of the long-range propagation characteristics of radar signals and the complex information processing capability of modern digital electronics to provide high resolution imagery.
The electron beam is generally scanned in a raster scan pattern, and the beam's position is combined with the detected signal to produce an image. SEM can achieve resolution better than 1 nanometer. Specimens can be observed in high vacuum, in low vacuum, in wet conditions (in environmental SEM), and at a wide range of cryogenic or elevated temperatures. The most common SEM mode is detection of secondary electrons emitted by atoms excited by the electron beam.