Backbone data transmission

The United States also builds and maintains satellites that provide secure voice and data transmission capability. Equipped with antijamming devices, these form the backbone of an elaborate satellite network that affords commanders from NATO countries a reliable system for worldwide command and control. Other satellites are used to gather intelligence and serve as navigation aids to troops on the ground or... 

Figure 4.1 Comparison of the IR (upper) and Raman (lower) spectra of nylon-6,6. The IR spectrum was obtained by transmission through a film cast from formic acid, while the Raman spectrum was obtained from a chip of polymer. Note the domination of bands due to polar (amide) groups in the IR data, while the Raman spectrum is dominated by backbone and C-H modes. In fact, below 1650 cm the Raman spectrum is reminiscent of that of polyethylene.

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